Sulfur-containing composition as well as preparation method and application thereof

Abstract

The invention provides a sulfur-containing composition and a preparation method and application thereof, and belongs to the field of mining and metallurgy. The sulfur-containing composition comprises a vulcanizing agent and a surface modifier, the surface modifier is loaded on the surface of the vulcanizing agent, the particle size of the surface modifier is smaller than that of the vulcanizing agent, and the surface modifier comprises inorganic powder and / or organic powder. According to the sulfur-containing composition provided by the invention, the inorganic powder and / or the organic powder are / is used as the surface modifier to modify the surface of the vulcanizing agent, so that the structural stability of the vulcanizing agent is improved, and the situations of pulverization, structural deformation, adhesion and scaling caused by collision, extrusion and the like of the vulcanizing agent during conveying can be reduced; therefore, the utilization rate and the conveying efficiency of the vulcanizing agent are effectively improved.

Description

Technical Field

[0001] This application belongs to the field of mining and metallurgy, and particularly relates to a sulfur-containing composition, a preparation method thereof, and an application thereof. Background Art

[0002] Laterite nickel ore is generally prepared into nickel matte (also known as nickel sulfide) through reduction sulfide smelting. Among them, during the sulfidation process, a sulfiding agent is usually used to participate in the sulfidation reaction, and the sulfiding agent generally needs to be transported to the reaction site (such as a molten pool) through a transportation tool (such as a conveyor belt or a high-temperature chain plate or a pipeline, etc.) to participate in the sulfidation.

[0003] However, in the related art, the utilization rate of the sulfiding agent used in sulfide smelting is poor.

[0004] In view of this, this application is specifically proposed. Summary of the Invention

[0005] This application provides a sulfur-containing composition, a preparation method thereof, and an application thereof, aiming to solve the problem of poor utilization rate of the sulfiding agent in the prior art.

[0006] The first aspect of this application provides a sulfur-containing composition, including a sulfiding agent and a surface modifier. The surface modifier is loaded on the surface of the sulfiding agent, and the particle size of the surface modifier is smaller than that of the sulfiding agent. The surface modifier includes inorganic powder and / or organic powder.

[0007] The sulfur-containing composition provided by this application includes a sulfiding agent and a surface modifier. The surface modifier includes inorganic powder and / or organic powder. By using inorganic powder and / or organic powder as the surface modifier to modify the surface of the sulfiding agent, the inorganic powder and / or organic powder with a smaller particle size can be loaded on the surface of the sulfiding agent with a larger particle size, thereby promoting the improvement of the structural stability of the sulfiding agent; and, after the inorganic powder and / or organic powder are used as the surface modifier and loaded on the surface of the sulfiding agent, the contact area between the sulfiding agent and the external environment is reduced by the barrier of the surface modifier to synergistically improve the structural stability of the sulfiding agent. In this way, the situation of powdering, structural deformation, and adhesion and scaling of the sulfiding agent caused by collision and extrusion during transportation can be reduced, thereby reducing the loss of the sulfiding agent and the transportation resistance to improve the transportation efficiency; and during the sulfidation process, under the condition that there is a surfactant on the surface of the sulfiding agent, the generation of sulfur dioxide generated by the sulfiding agent can also be reduced, thereby effectively improving the utilization rate of the sulfiding agent. Therefore, the sulfur-containing composition provided by this application can improve the transportation efficiency and utilization rate of the sulfiding agent.

[0008] In some embodiments, by mass fraction, the content of the surface modifier in the sulfur-containing composition is 4% to 40%, optionally 5% to 37%; and / or, the content of the vulcanizing agent in the sulfur-containing composition is 60% to 96%, optionally 73% to 95%. By designing the content of the surface modifier and / or the vulcanizing agent in the sulfur-containing composition, the stability of the surface modifier loaded on the surface of the vulcanizing agent can be enhanced, thereby improving the structural stability of the vulcanizing agent.

[0009] In some embodiments, at least part of the surface modifier is embedded in the surface of the vulcanizing agent. The inorganic powder and / or organic powder with a smaller particle size mainly exists in the form of particles, and at least part of it is embedded in the surface of the vulcanizing agent, which helps to enhance the stability during loading, thereby promoting the further improvement of the structural strength of the vulcanizing agent.

[0010] In some embodiments, the vulcanizing agent includes sulfur particles. By designing the composition and morphology of the vulcanizing agent, the sulfur particles can provide sulfur elements during the vulcanization reaction, and the granular sulfur can make it easier for the surface modifier with a smaller particle size to be loaded on the surface of the vulcanizing agent. The surface modifier with a small particle size can be partially embedded in the surface of the vulcanizing agent; at the same time, the granular vulcanizing agent is also beneficial to improving the fluidity during the transportation of the vulcanizing agent, reducing the probability of structural deformation and adhesion and scaling during the transportation of the vulcanizing agent, so as to improve the utilization rate and transportation efficiency of the vulcanizing agent.

[0011] In some embodiments, the vulcanizing agent includes sulfur, and the sulfur satisfies at least one of the following conditions: (Ⅰ) the particle size of the sulfur is 75 μm - 1700 μm; (Ⅱ) based on the total number of the sulfur, the proportion of the sulfur with a particle size of 75 μm - 1700 μm is more than 32%. When the sulfur in the vulcanizing agent is in the particle size range of 75 μm - 1700 μm, a relatively large specific surface area can be provided, which is beneficial to the loading of the surface modifier with a smaller particle size, thereby further strengthening the structural stability of the vulcanizing agent. The proportion of the sulfur with a particle size of 75 μm - 1700 μm in the total number of sulfur is more than 32%, which can make the overall stability of the vulcanizing agent stronger and the fluidity during transportation more excellent after the surface modifier is loaded on the sulfur surface, so as to reduce the powdering, structural deformation and adhesion and scaling generated by the collision and extrusion of sulfur particles during high-speed transportation.

[0012] In some embodiments, the surface modifier satisfies at least one of the following conditions: (I) the particle size of the surface modifier is less than 75 μm; (II) based on the total number of surface modifiers, the proportion of surface modifiers with a particle size less than 75 μm is more than 85%. By designing the particle size of the surface modifier, the surface modifier with a particle size less than 75 μm is more easily loaded on the surface of the vulcanizing agent. The proportion of the number of surface modifiers with a particle size less than 75 μm being more than 85% of the total number of surface modifiers can enable more surface modifier particles to be loaded on the surface of the vulcanizing agent, thereby more effectively enhancing the structural stability of the vulcanizing agent.

[0013] In some embodiments, the surface modifier includes two or more kinds of powder materials; optionally, in the surface modifier, the mass ratio of any two kinds of powder materials is 1:(1 - 8); optionally, the mass ratio of any two kinds of powder materials is 1:(1 - 4). By designing the surface modifier to include two or more kinds of powder materials and the mass ratio of any two kinds of powder materials satisfying the above range, a variety of powder materials can jointly produce a synergistic effect on the surface of the vulcanizing agent to further improve the structural stability of the vulcanizing agent.

[0014] In some embodiments, the inorganic powder material includes at least one of oxides, salts, hydroxides or non-metal simple substances; optionally, the surface modifier includes at least one of magnesium silicate, zinc oxide, silicon dioxide, silica, clay, calcium hydroxide, calcium oxide, aluminum oxide, barium sulfate, magnesium oxide, calcium carbonate, aluminum silicate, zinc silicate; optionally, the inorganic powder material includes at least one of talc powder, lime powder and quartz powder; optionally, the organic powder material includes at least one of carbon powder and coal powder. As a powder particle with a smaller particle size, when the surface modifier is selected from at least one of the above substances, it can be better loaded on the surface of the vulcanizing agent, thereby improving the structural stability of the vulcanizing agent.

[0015] The second aspect of the present application provides a method for preparing the above sulfur-containing composition, by grinding and mixing the vulcanizing agent and the surface modifier in a predetermined ratio to obtain the sulfur-containing composition. By grinding and mixing the vulcanizing agent and the surface modifier in a predetermined ratio, the inorganic powder material with a smaller particle size and / or can be stably loaded on the surface of the vulcanizing agent with a larger particle size, so as to improve the structural stability of the vulcanizing agent.

[0016] In some embodiments, the grinding and mixing of a vulcanizing agent and a surface modifier in a predetermined ratio includes: pulverizing and sieving the vulcanizing agent to obtain vulcanizing agent particles; mixing the surface modifier and the vulcanizing agent particles in a predetermined ratio to obtain a mixed material, and subjecting the mixed material to centrifugal stirring grinding and air draft collection. After sulfur is pulverized and sieved and then mixed with the surface modifier in a predetermined ratio, the uniformity of the vulcanizing agent can be improved, which is conducive to increasing the loading rate of the surface modifier on the surface of the vulcanizing agent; by subjecting the mixed material to centrifugal stirring grinding, the surface modifier can be fully filled in the surface gaps of the vulcanizing agent particles, further improving the structural stability of the vulcanizing agent.

[0017] In some embodiments, the centrifugal stirring grinding and air draft collection of the mixed material includes: feeding the mixed material into a mill at a preset feeding speed for centrifugal stirring grinding; using an air draft fan to collect the mixed material after centrifugal stirring grinding to obtain a sulfur-containing composition. By means of centrifugal stirring grinding in the mill, the surface modifier and the vulcanizing agent can be fully contacted, enabling the surface modifier to better penetrate and coat the surface of the vulcanizing agent particles, thereby achieving a better modification effect. After centrifugal stirring grinding, the use of the air draft fan can collect the sulfur-containing composition to effectively separate the sulfur-containing composition and other solid impurities, obtaining a pure sulfur-containing composition product.

[0018] In some embodiments, the feeding speed is 10 kg / min to 30 kg / min; and / or the frequency of the mill is 3 Hz to 7 Hz; and / or the frequency of the air draft fan is 30 Hz to 50 Hz. Within the above feeding speed range, the residence time and fluidity of the mixed material in the mill can be ensured, avoiding uneven mixing or poor grinding effect caused by too fast or too slow feeding speed; within the above frequency range of the mill, the grinding fineness and uniformity of the mixed material can be controlled, ensuring that the surface modifier is effectively loaded on the surface of the vulcanizing agent; within the above frequency range of the air draft fan, the collection efficiency can be improved and the mixing of impurities in the sulfur-containing composition can be reduced.

[0019] The third aspect of the present application provides the use of the above sulfur-containing composition in the preparation of matte from laterite nickel ore.

[0020] In some embodiments, the application of the sulfur-containing composition in the preparation of matte from laterite nickel ore includes: loading the sulfur-containing composition onto a transport vehicle and transporting it to a reaction site for sulfidation reaction. By loading the above sulfur-containing composition onto a transport vehicle and transporting it to a reaction site for sulfidation reaction, the sulfiding agent in the sulfur-containing composition undergoes surface modification treatment by a surface modifier, has strong stability, effectively avoids the floating and scattering of the sulfiding agent outside the transport vehicle, and the sulfiding agent is not easily powdered during transportation, avoiding scale formation on the transport vehicle and causing blockage of the transport vehicle, thereby greatly improving the utilization rate and transportation efficiency of the sulfiding agent.

[0021] In some embodiments, the application of the above sulfur-containing composition in the preparation of matte from laterite nickel ore specifically includes: pneumatically transporting the sulfur-containing composition in a closed pipeline and injecting it into a reaction site through spraying for sulfidation reaction. By pneumatically transporting the above sulfur-containing composition in a closed pipeline, it can be ensured that the sulfur-containing composition contacts the external environment during transportation, thereby avoiding the volatilization, oxidation or deliquescence of the sulfiding agent and improving the transportation safety of the sulfiding agent; the sulfiding agent in the above sulfur-containing composition has strong structural stability, which can avoid the formation of adhesion and scale in the closed pipeline and the spray gun and cause blockage, effectively improving the utilization rate and transportation efficiency of the sulfiding agent.

[0022] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. Specific Embodiments

[0023] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a specific range. The ranges defined in this way can include the end values or not include the end values, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60 - 120 and 80 - 110 are listed for a specific parameter, ranges of 60 - 110 and 80 - 120 are also contemplated. In addition, if the minimum range values of 1 and 2 are listed, and if the maximum range values of 3, 4, and 5 are listed, then the following ranges are all contemplated: 1 - 3, 1 - 4, 1 - 5, 2 - 3, 2 - 4, and 2 - 5. In the present application, unless otherwise stated, the numerical range "a - b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0 - 5" means that all real numbers between "0 - 5" have been fully listed herein, and "0 - 5" is only an abbreviated representation of these numerical combinations. Additionally, when stating that a certain parameter is an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0024] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0025] Unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0026] Unless otherwise specified, all steps of the present application can be carried out sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) carried out sequentially, or may also include steps (b) and (a) carried out sequentially. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may also include steps (a), (c) and (b), or may also include steps (c), (a) and (b), etc.

[0027] Unless otherwise specified, the terms "comprising" and "including" mentioned in the present application mean open-ended or may also be closed-ended. For example, the "comprising" and "including" may further include or contain other components not listed, or may only include or contain the listed components.

[0028] Unless otherwise specified, in the present application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) while B is true (or exists); or both A and B are true (or exist).

[0029] As described in the above background art, nickel laterite ore is generally prepared into nickel matte (also known as nickel sulfide matte) through reduction sulfide smelting. Among them, during the sulfidation process, a sulfiding agent is usually used to participate in the sulfidation reaction, and the sulfiding agent generally needs to be transported to the reaction site (such as a molten pool) through a transportation tool (such as a conveyor belt, a high-temperature chain plate, a pipeline, etc.) to participate in the sulfidation.

[0030] However, in the related art, due to the poor structural stability of the sulfiding agent, during transportation, the sulfiding agents will collide and squeeze with each other, etc., making it easy to powderize, deform in structure, and adhere and scale, resulting in poor utilization rate of the sulfiding agent.

[0031] In view of this, the present application provides a sulfur-containing composition, which can improve the utilization rate and transportation efficiency of the sulfiding agent.

[0032] An embodiment of the present application provides a sulfur-containing composition, including a vulcanizing agent and a surface modifier. The surface modifier is loaded on the surface of the vulcanizing agent, and the particle size of the surface modifier is smaller than that of the vulcanizing agent. The surface modifier includes inorganic powder and / or organic powder.

[0033] In the embodiment of the present application, the inorganic powder and / or organic powder used as the surface modifier has high melting point, thermal stability and anti-friction property, and can maintain its physical properties under high temperature and high pressure conditions. By using inorganic powder and / or organic powder with a smaller particle size as the surface modifier to modify the surface of the vulcanizing agent, the inorganic powder and / or organic powder is loaded on the surface of the vulcanizing agent, which can reduce the contact area between the vulcanizing agent and the external environment, thereby effectively improving the structural stability of the vulcanizing agent. The sulfur-containing composition provided by the present application is applied to the preparation of matte from laterite nickel ore. The sulfur-containing composition is not easy to float and scatter during transportation, thereby improving the transportation reliability of the vulcanizing agent; and the vulcanizing agent has high structural strength after being modified by the surface modifier, so that the situation of powdering, structural deformation and adhesion and scaling caused by collision and extrusion during transportation can be reduced, thereby reducing the loss and transportation resistance of the vulcanizing agent to improve the transportation efficiency; moreover, during the vulcanization process, in the presence of a surfactant on the surface of the vulcanizing agent, the generation of sulfur dioxide generated by the vulcanizing agent can also be reduced, thereby effectively improving the utilization rate of the vulcanizing agent. Therefore, the sulfur-containing composition provided by the present application can improve the transportation efficiency and utilization rate of the vulcanizing agent.

[0034] It should be noted that the surface modifier in the present application can be one or more inorganic powders, or one or more organic powders, or even a mixed powder formed by one or more inorganic powders and organic powders.

[0035] It should be understood that the inorganic powder in the present application refers to the powder formed by substances without carbon-hydrogen bonds. Exemplarily, the inorganic powder can be the powder formed by compounds without carbon elements (such as magnesium silicate, calcium oxide), single substances (such as carbon, silicon), compounds containing carbon elements and without carbon-hydrogen bonds (such as calcium carbonate, silicon carbide), and the mixed powder formed by any several of the above three substances.

[0036] It should be understood that the organic powder in the present application refers to the powder formed by substances containing carbon-hydrogen bonds. Exemplarily, the organic powder can be carbon powder prepared by sintering carbon-containing organic matter or coal powder prepared by pulverizing coal mines, or the mixed powder formed by the above two substances.

[0037] In addition, in the sulfur-containing composition provided by the present application, the surface modifier being loaded on the surface of the vulcanizing agent means that the surface modifier is fixed or attached to the surface of sulfur; for example, the surface modifier can interact with the vulcanizing agent through physical adsorption, chemical bonding, etc., so as to be fixed or attached to the surface of the vulcanizing agent, forming a sulfur-containing composition in the form of a complex.

[0038] In the vulcanizing agent provided by the present application, the surface modifier can completely coat the vulcanizing agent and / or partially coat the vulcanizing agent, both of which can effectively enhance the structural stability of the vulcanizing agent, reduce the contact area between the vulcanizing agent particles and the external environment, and make the vulcanizing agent not easily powdered.

[0039] It should be clear that the smaller particle size in the embodiments of the present application means that the particle size of the surface modifier particles is smaller than that of the vulcanizing agent particles; correspondingly, the larger particle size means that the particle size of the vulcanizing agent particles is larger than that of the surface modifier.

[0040] It should be understood that in a high-temperature environment, the surface modifier loaded on the vulcanizing agent in the sulfur-containing composition provided by the present application can delay the volatilization of the vulcanizing agent in a high-temperature environment by absorbing, transferring, and dispersing heat, etc., thereby further improving the effective utilization rate of the vulcanizing agent during mining and metallurgy transportation.

[0041] In some embodiments, by mass fraction, the content of the surface modifier in the sulfur-containing composition is 4% to 40%, and can be optionally 5% to 37%; and / or, the content of the vulcanizing agent in the sulfur-containing composition is 60% to 96%, and can be optionally 73% to 95%.

[0042] It can be understood that, by mass fraction, the content of the surface modifier in the sulfur-containing composition in this embodiment is 4 to 40%. For example, the content of the surface modifier in the sulfur-containing composition can be 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40% or any value within the range of 4% to 40% or the value range composed of any two of the above values.

[0043] In this embodiment, the content of the vulcanizing agent in the sulfur-containing composition is 60% to 96%. For example, the content of the vulcanizing agent in the sulfur-containing composition can be 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96% or any value in the range of 60% to 96% or a range consisting of any two of the above values.

[0044] In some embodiments, at least a portion of the surface modifier is embedded in the surface of the vulcanizing agent. For example, a portion of the surface modifier particles are combined with the surface of the vulcanizing agent particles in an embedded form, so that the surface modifier is stably loaded on the surface of the vulcanizing agent to effectively improve the structural stability of the vulcanizing agent.

[0045] In some embodiments, the vulcanizing agent includes metal sulfide particles and / or sulfur particles. For example, the vulcanizing agent in this embodiment can be metal sulfide particles, sulfur particles, or mixed particles of metal sulfide particles and sulfur particles. Metal sulfide particles and / or sulfur particles can provide the required loading points of the surface modifier, so that the surface modifier can effectively play a modifying role to enhance the structural stability of the vulcanizing agent. In addition, the granular vulcanizing agent is conducive to promoting the fluidity of the vulcanizing agent during transportation, improving the utilization rate and transportation efficiency of the vulcanizing agent, and more easily evenly distributed in the reaction site or area, thereby improving the efficiency of the vulcanization reaction.

[0046] In addition, the metal sulfide particles in this embodiment refer to solid particles composed of compounds formed by metal elements and sulfur elements. For example, the metal sulfide includes at least one of sodium sulfide, potassium sulfide, ferrous sulfide, manganese sulfide, and calcium sulfide. The sulfur particles in this embodiment refer to solid particles composed of sulfur.

[0047] In some embodiments, the vulcanizing agent includes sulfur, and the sulfur satisfies at least one of the following conditions: (I) the particle size of the sulfur is 75 μm-1700 μm; (II) based on the total amount of the sulfur, the number of sulfur with a particle size of 75 μm-1700 μm accounts for more than 32%. It is understandable that the sulfur particle size in the range of 75 μm-1700 μm is more conducive to the loading of the surface modifier. Based on the total amount of the sulfur, the number of sulfur with a particle size of 75 μm-1700 μm accounts for more than 32%, which can ensure the appropriate fluidity of the sulfur-containing composition modified by the vulcanizing agent during transportation, so as to facilitate the high-speed transmission of the vulcanizing agent.

[0048] In some embodiments, the surface modifier satisfies at least one of the following conditions: (I) the particle size of the surface modifier is less than 75 μm; (II) based on the total number of surface modifiers, the proportion of surface modifiers with a particle size less than 75 μm is more than 85%. It can be understood that the particle size of the surface modifier being less than 75 μm can ensure that the particle size of the surface modifier is small enough to be better loaded on the surface of the vulcanizing agent, thus ensuring the effectiveness of the modification effect. A smaller particle size of the surface modifier means a larger specific surface area of the surface modifier particles, which can more fully contact the surface of the vulcanizing agent, thereby achieving a more uniform and effective modification effect. And the proportion of surface modifiers with a particle size less than 75 μm being more than 85% of the total number of surface modifiers means that the surface modifiers with a smaller particle size play a dominant role in the entire modification process, thus enabling better modification of the surface of the vulcanizing agent.

[0049] In some embodiments, the inorganic powder includes at least one of an oxide, a salt, a hydroxide, or a non-metallic element; for example, the inorganic powder can be selected as an inorganic powder containing any one of an oxide, a salt, a hydroxide, or a non-metallic element, or a mixed inorganic powder formed by any two or more of an oxide, a salt, a hydroxide, or a non-metallic element.

[0050] In some embodiments, the surface modifier includes at least one of magnesium silicate, zinc oxide, silicon dioxide, silica, clay, calcium hydroxide, calcium oxide, aluminum oxide, barium sulfate, magnesium oxide, calcium carbonate, aluminum silicate, zinc silicate; the surface modifier can be selected as a powder containing any one of the above substances, or a mixed powder containing two or more of the above substances.

[0051] In some embodiments, the surface modifier includes at least one of talc powder, lime powder, and quartz powder; the surface modifier can be selected as any one of talc powder, lime powder, and quartz powder, or a mixed powder containing two or more of the above substances.

[0052] In some embodiments, the surface modifier further includes an organic powder, and the organic powder includes at least one of carbon powder and coal powder; the organic powder can be selected as any one of carbon powder and coal powder, or a mixed powder containing carbon powder and coal powder.

[0053] It should be understood that the talcum powder in this embodiment is a fine powder obtained by grinding and processing talc ore, and the main component of talc ore is magnesium silicate hydrate. Lime powder is a fine powder obtained by high-temperature calcination of limestone (the main component is calcium carbonate). Carbon powder is a powder form of fine particles made of carbon elements, usually processed from organic raw materials such as coal, charcoal or graphite. Quartz powder is a fine powder obtained by grinding and processing quartz ore, and its main component is silicon dioxide. Coal fines refer to coal with a particle size less than 0.5 mm, usually obtained by grinding coal mines.

[0054] In some embodiments, the surface modifier includes two or more kinds of powders; wherein, the mass ratio between any two kinds of powders is 1:(1-8), and can be selected as 1:(1-4). The surface modifier includes two or more kinds of powders, and the mass ratio between any two kinds of powders satisfies the above range, which can enable a variety of powders to produce a synergistic effect on the surface of the vulcanizing agent to further improve the structural stability of the vulcanizing agent. For example, when the surface modifier includes two or more kinds of powders, the mass ratio between any two kinds of powders can be 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8 or any mass ratio within the range of 1:(1-8).

[0055] Another embodiment of the present application also provides a method for preparing the above sulfur-containing composition, by grinding and mixing the vulcanizing agent and the surface modifier in a predetermined ratio to obtain the sulfur-containing composition. In this embodiment, by grinding and mixing the vulcanizing agent and the surface modifier in a predetermined ratio, the surface modifier can be effectively loaded on the surface of the vulcanizing agent to improve the structural stability of the vulcanizing agent.

[0056] In some embodiments, grinding and mixing the vulcanizing agent and the surface modifier in a predetermined ratio includes: performing crushing and sieving on the vulcanizing agent to obtain vulcanizing agent particles; mixing the surface modifier and the vulcanizing agent particles in a predetermined ratio to obtain a mixed material, and performing centrifugal stirring, grinding and air induction collection on the mixed material. After the vulcanizing agent in this embodiment is subjected to crushing and sieving, vulcanizing agent particles within the target particle size range can be obtained. After the vulcanizing agent is crushed, the gaps on the particle surface increase, which is beneficial to improving the loading rate of the surface modifier on the vulcanizing agent.

[0057] Further, the mixed material obtained by mixing the surface modifier and the vulcanizing agent particles in a predetermined ratio is subjected to centrifugal stirring and grinding, so that the surface modifier can be embedded on the surface of the vulcanizing agent particles, making the prepared vulcanizing agent have strong structural stability; by performing induced air collection on the mixed material after centrifugal stirring and grinding, the impurity content in the sulfur-containing composition can be reduced, and the purity of the sulfur-containing composition can be improved.

[0058] It should be understood that the induced air collection in this embodiment refers to collecting the prepared sulfur-containing composition by using wind power.

[0059] In some embodiments, the centrifugal stirring and grinding and induced air collection of the mixed material include: feeding the mixed material into the mill at a preset feeding speed for centrifugal stirring and grinding; using an induced draft fan to collect the mixed material after centrifugal stirring and grinding to obtain a sulfur-containing composition.

[0060] The mill in this embodiment is a mechanical device for crushing, stirring, grinding and other processing of materials. During the centrifugal stirring and grinding process, the mill generates centrifugal force by rotating, so that the mixed material is subjected to impacts, frictions and shears in the mill, thereby realizing the effective combination of the vulcanizing agent particles and the surface modifier, and making the surface modifier loaded on the surface of the vulcanizing agent. The induced draft fan is a mechanical device for generating air flow or providing gas transportation to blow out and collect the ground material from the mill, and finally obtain a sulfur-containing composition.

[0061] In some embodiments, the feeding speed is 10-30 kg / min; and / or the frequency of the mill is 3-7 Hz, optionally 5 Hz; and / or the frequency of the induced draft fan is 30-50 Hz, optionally 40 Hz. Appropriate control of the feeding speed can ensure the normal operation of the mill and prevent excessive or insufficient raw materials from entering the mill. The control of the mill frequency is beneficial to more thorough centrifugal stirring and grinding of the mixed material, and the sulfur-containing composition is effectively collected by controlling the frequency of the induced draft fan.

[0062] Another embodiment of the present application provides the application of the above sulfur-containing composition in the preparation of matte from laterite nickel ore, including carrying the sulfur-containing composition on a transportation tool and transporting it into a reaction site for vulcanization reaction. The sulfur-containing composition in this embodiment is not easily powdered on the transportation tool, thereby reducing the occurrence of fouling and blockage of the transportation tool, so as to achieve efficient and stable transportation of the vulcanizing agent.

[0063] In some embodiments, the application of the above sulfur-containing composition in the preparation of matte from laterite nickel ore specifically includes: carrying the vulcanizing agent in a closed pipeline for pneumatic transportation and blowing it into the reaction site for vulcanization reaction.

[0064] It should be understood that the "matte" in this embodiment refers to an intermediate product produced during the smelting of laterite nickel ore, usually a miscible body of various metal sulfides. When preparing matte from laterite nickel ore, the above sulfur-containing composition is used as the sulfur source during the sulfidation reaction, and the sulfur element in the sulfur-containing composition reacts with the metal elements in the laterite nickel ore to prepare matte.

[0065] The pneumatic conveying in this embodiment refers to a method of using a gas (usually air) as a transmission medium to transport the sulfiding agent from one position to another. By adjusting the gas flow rate and pressure, the gas forms a high-speed flow in a closed pipeline to achieve the purpose of high-speed transporting the sulfiding agent. The sulfur-containing composition is carried in the closed pipeline, and the closed pipeline has high tightness and can better adapt to the high-temperature environment during pyrometallurgy to meet the transportation requirements of the sulfur-containing composition particles. The injection in this embodiment can be achieved by a spray gun arranged at the end of the closed pipeline. By adjusting the angle of the spray gun, the sulfur-containing composition transported by the closed pipeline can be directly injected into the reaction site (molten pool) for sulfidation reaction.

[0066] The following examples take sulfur as the sulfiding agent as an example to more specifically describe the content disclosed in this application. These examples are only for illustrative purposes, because various modifications and changes within the scope of the content disclosed in this application are obvious to those skilled in the art. Unless otherwise stated, all reagents and raw materials used in the examples are commercially available or can be synthesized according to conventional methods, and the instruments used in the examples are all commercially available.

[0067] Example 1

[0068] Take an appropriate amount of talcum powder and sulfur particles that have been crushed and sieved. Among them, the sulfur particles with a particle size less than 48 μm account for 46.21% of the total amount of sulfur particles (see Table 1, S-001 in detail); prepare a mixed material with a mass ratio of sulfur particles: talcum powder of 100:5; send the mixed material into the mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters the collection container through the airflow provided by the induced draft fan for collection to obtain the sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0069] Example 2

[0070] Take an appropriate amount of lime powder and sulfur particles that have been pulverized and sieved. Among them, sulfur particles with a particle size less than 48 μm account for 1.1% of the total amount of sulfur particles (see Table 1, S-002 for details); prepare a mixed material with a mass ratio of lime powder to sulfur particles of 100:5; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by a draft fan for collection to obtain a sulfur-containing composition, and the frequency of the draft fan is controlled at 40 Hz.

[0071] Example 3

[0072] Take an appropriate amount of carbon powder and sulfur particles that have been pulverized and sieved. Among them, sulfur particles with a particle size less than 48 μm account for 7.52% of the total amount of sulfur particles (see Table 1, S-003 for details); prepare a mixed material with a mass ratio of sulfur particles to carbon powder of 100:5; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by a draft fan for collection to obtain a sulfur-containing composition, and the frequency of the draft fan is controlled at 40 Hz.

[0073] Example 4

[0074] Take an appropriate amount of talc powder, lime powder, and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles: talc powder: lime powder of 100:6:6; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by a draft fan for collection to obtain a sulfur-containing composition, and the frequency of the draft fan is controlled at 40 Hz.

[0075] Example 5

[0076] Take an appropriate amount of carbon powder, talc powder, and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles: carbon powder: talc powder of 100:5:5; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by a draft fan for collection to obtain a sulfur-containing composition, and the frequency of the draft fan is controlled at 40 Hz.

[0077] Example 6

[0078] Take appropriate amounts of carbon powder, talcum powder, lime powder, and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles: carbon powder: talcum powder: lime powder of 100:6:6:6; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by an induced draft fan for collection to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0079] Example 7

[0080] Take appropriate amounts of quartz powder and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles: quartz powder of 100:5; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by an induced draft fan for collection to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0081] Example 8

[0082] Take appropriate amounts of quartz powder, carbon powder, and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles: quartz powder: carbon powder of 100:9:9; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by an induced draft fan for collection to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0083] Example 9

[0084] Take appropriate amounts of quartz powder, talcum powder, and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles: quartz powder: talcum powder of 100:9:9; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by an induced draft fan for collection to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0085] Example 10

[0086] Take an appropriate amount of quartz powder, lime powder, and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles: quartz powder: lime powder of 100:9:9; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by a blower for collection to obtain a sulfur-containing composition, and the frequency of the blower is controlled at 40 Hz.

[0087] Example 11

[0088] Take an appropriate amount of quartz powder, lime powder, talc powder, and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles: quartz powder: lime powder: talc powder of 100:9:9:9; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by a blower for collection to obtain a sulfur-containing composition, and the frequency of the blower is controlled at 40 Hz.

[0089] Example 12

[0090] Take an appropriate amount of quartz powder, lime powder, talc powder, carbon powder, and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles: quartz powder: lime powder: talc powder: carbon powder of 100:9:9:9:9; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by a blower for collection to obtain a sulfur-containing composition, and the frequency of the blower is controlled at 40 Hz.

[0091] Example 13

[0092] Take an appropriate amount of quartz powder, lime powder, carbon powder, and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles: quartz powder: lime powder: carbon powder of 100:9:9:9; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the airflow provided by a blower for collection to obtain a sulfur-containing composition, and the frequency of the blower is controlled at 40 Hz.

[0093] Example 14

[0094] Take appropriate amounts of lime powder, talcum powder, and sulfur particles that have been pulverized and sieved, and prepare a mixed material with a mass ratio of sulfur particles:lime powder:talcum powder of 100:5:5; feed the mixed material into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the air flow provided by an induced draft fan for collection to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0095] Comparative Example 1

[0096] Take appropriate amounts of the sulfur particles that have been pulverized and sieved in Example 1, among which the sulfur particles with a particle size less than 48 μm account for 46.21% of the total amount of sulfur particles (see Table 1, S-001 for details); feed the sulfur particles into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the air flow provided by an induced draft fan for collection to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0097] Comparative Example 2

[0098] Take appropriate amounts of the sulfur particles that have been pulverized and sieved in Example 2, among which the sulfur particles with a particle size less than 48 μm account for 1.1% of the total amount of sulfur particles (see Table 1, S-002 for details); feed the sulfur particles into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the air flow provided by an induced draft fan for collection to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0099] Comparative Example 3

[0100] Take appropriate amounts of the sulfur particles that have been pulverized and sieved in Example 3, among which the sulfur particles with a particle size less than 48 μm account for 7.52% of the total amount of sulfur particles (see Table 1, S-003 for details); feed the sulfur particles into a mill for centrifugal stirring and grinding treatment, control the feeding speed at 30 kg / min, and the control frequency of the mill at 5 Hz; the mixed material after centrifugal stirring and grinding treatment enters a collection container through the air flow provided by an induced draft fan for collection to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0101] Testing Section

[0102] (1) Sieve-Through Sample Test

[0103] According to the national standard GB / T6003.1-2012, an experimental sieve is used to separate the mixed particles, and an analytical balance with a precision of 0.001 g is used to measure the total weight m1 of the sample and the mass m2 of the sample passing through the experimental sieve. Then, the mass percentage of the sample passing through the experimental sieve is (m1 - m2) × 100%.

[0104] (2) Recovery rate test

[0105] An overhead scale with a precision of 0.1 kg is used. After zeroing, the weight of the ton bag is measured and recorded as m3. After zeroing the overhead scale again, the ton bag filled with the material is weighed and recorded as m4. Then, (m4 - m3) is the total mass of the sulfur-containing composition measured. The total mass of the sulfur-containing composition collected after spraying and the ton bag is m5. Then, the mass of the sulfur-containing composition collected after spraying is (m5 - m3). Therefore, the recovery rate is equal to (m5 - m3) / (m4 - m3) × 100%.

[0106] (3) Pipeline scaling thickness test

[0107] A vernier caliper with a precision of 0.01 mm is used to measure the inner diameter of the pipeline. Before transporting the vulcanizing agent, close the jaws of the caliper and ensure that the 0 line of the secondary scale is aligned with the 0 line of the main scale. Place the pipeline to be measured between the outer measuring jaws. When it is in close contact with the jaws, take the reading and record it as d1. After transporting the vulcanizing agent, select the scaling area inside the pipeline and use the outer measuring jaws to measure. The reading is the thickness of the scaling layer and the pipeline, which is d2. Then, the thickness of the scaling layer is d2 - d1.

[0108] The above recovery rate and pipeline scaling thickness tests are both carried out under the condition of blowing the test chamber with nitrogen (industrial grade) at a flow rate of 55 cm 3 / min. A total of two rounds of heating and cooling tests are carried out for 1 h. Starting from the temperature of the test chamber at room temperature, heat it to 220℃ at a heating rate of 20℃ / min, then cool it to room temperature at a cooling rate of 20℃ / min, and then heat it to 220℃ again at a heating rate of 20℃ / min.

[0109] The particle size analysis of the sulfur particles in Examples 1 to 3 is carried out, and the analysis results are shown in Table 1 below:

[0110] Table 1. Particle size analysis table of sulfur powder in Examples 1 to 3

[0111]

[0112]

[0113] The sulfur-containing compositions prepared in Examples 1 to 3 and each comparative example are respectively subjected to pneumatic conveying in a closed pipeline, and the particle size analysis of the sulfur-containing composition after conveying is carried out. The analysis results are shown in Table 2 below:

[0114] Table 2. Particle size analysis table of the sulfur-containing compositions prepared in Examples 1 to 3 and each comparative example after transportation

[0115]

[0116]

[0117] The sulfur-containing compositions prepared in Examples 1 to 3 and each comparative example above were respectively blown through a spray gun and then recovered to verify the utilization rate of the vulcanizing agent through the spray recovery test. The test data results are shown in Table 3 below:

[0118] Table 3. Spray recovery test data table of the sulfur-containing compositions prepared in Examples 1 to 3 and each comparative example

[0119] Serial number Total weight of sulfur-containing composition input / kg Total weight of sulfur-containing composition recovered / kg Recovery rate Example 1 1000 980 98.00％ Example 2 1000 979 97.90％ Example 3 1000 978 97.80％ Comparative example 1 2000 412 20.60％ Comparative example 2 2000 496 24.80％ Comparative example 3 2000 724 36.20％

[0120] The sulfur-containing compositions prepared in each example and comparative example were respectively pneumatically transported in a closed pipeline. Each sulfur-containing composition was sieved through a 300-mesh (48 μm) sieve before and after transportation, and the thickness of the pipeline scaling layer of each sulfur-containing composition in the pipeline was measured for 1 hour. The test results are shown in Table 4 below:

[0121] Table 4. Statistical table of sulfur-containing composition transportation test data

[0122]

[0123] Combined with Tables 1 to 4, the sulfur-containing compositions prepared in each example and comparative example were analyzed:

[0124] Comparing Comparative Example 1 with Example 1, as can be seen from Tables 1 and 2, the vulcanizing agent in Comparative Example 1 was not surface-modified, and the sulfur-containing composition was pure sulfur particles. After pneumatic transportation in a closed pipeline, the particles in the sulfur-containing composition with a particle size range less than 48 μm increased significantly. Further combining with Table 4, it can be seen that the percentage of the sulfur-containing composition in Comparative Example 1 with a particle size less than 48 μm after transportation was significantly increased compared with the percentage of the particle size less than 48 μm before transportation, and the thickness of the 1-hour pipeline scaling layer was 10 mm, which was much higher than the sulfur-containing composition prepared in Example 1, further verifying that the vulcanizing agent powder in Comparative Example 1 was severely pulverized and prone to adhesion and scaling in the transportation pipeline. By combining with Table 3, it can be seen that the recovery rate of the sulfur-containing composition in Comparative Example 1 after spraying was only 20.60%, indicating that the utilization rate of the vulcanizing agent in Comparative Example 1 was low and the transportation efficiency was poor.

[0125] In Example 1, the sulfur-containing composition uses talc powder as a surface modifier to modify the surface of the vulcanizing agent (sulfur). After the sulfur-containing composition is transported, there is no obvious increase in the particles in the particle size range less than 48 μm, indicating that the structural stability of the vulcanizing agent in the sulfur-containing composition prepared in Example 1 is relatively strong; the percentage increase in the proportion of particles with a particle size less than 48 μm in the sulfur-containing composition after transportation in Example 1 compared to before transportation is relatively small, and the thickness of the pipeline scaling layer after 1 h is less than 0.1 mm, far lower than that of the sulfur-containing composition prepared in Comparative Example 1, and the recovery rate is as high as 98.00%. Therefore, in the sulfur-containing composition prepared in Example 1, after the vulcanizing agent is surface-modified with inorganic powder, the structural stability of the vulcanizing agent is significantly improved, thereby improving the utilization rate and transportation efficiency of the vulcanizing agent.

[0126] Comparing Comparative Example 2 with Example 2, as can be seen from Table 1 and Table 2, the sulfur-containing composition in Comparative Example 2 was not subjected to surface modification treatment, and the sulfur-containing composition was pure sulfur particles. After pneumatic transportation in a closed pipeline, the particles in the sulfur-containing composition in the particle size range less than 48 μm increased significantly. Further combining Table 4, it can be seen that the percentage increase in the proportion of particles with a particle size less than 48 μm in the sulfur-containing composition after transportation in Comparative Example 1 compared to before transportation is significantly increased, and the thickness of the pipeline scaling layer after 1 h is 10.2 mm, much higher than that of the sulfur-containing composition prepared in Example 2, further verifying that the vulcanizing agent in Comparative Example 2 is severely pulverized and easily causes adhesion and scaling in the transportation pipeline. By combining Table 3, it can be seen that the recovery rate of the sulfur-containing composition in Comparative Example 2 after spraying is only 24.80%, and the loss of the vulcanizing agent is serious, indicating that the utilization rate of the vulcanizing agent in Comparative Example 2 is low and the transportation efficiency is poor.

[0127] In Example 2, the sulfur-containing composition uses lime powder as a surface modifier to modify the surface of the vulcanizing agent (sulfur). After the sulfur-containing composition is transported, there is no obvious increase in the particles in the particle size range less than 48 μm, indicating that the structural stability of the vulcanizing agent in the sulfur-containing composition prepared in Example 2 is relatively strong; the percentage increase in the proportion of particles with a particle size less than 48 μm in the sulfur-containing composition after transportation in Example 2 compared to before transportation is relatively small, and the thickness of the pipeline scaling layer after 1 h is 0, far lower than that of the sulfur-containing composition prepared in Comparative Example 2. The recovery rate of the sulfur-containing composition prepared in Example 2 after spraying is as high as 97.90%. Therefore, in the sulfur-containing composition prepared in Example 2, the vulcanizing agent is surface-modified with inorganic powder, and the structural stability of the vulcanizing agent is significantly improved, thereby promoting the utilization rate and transportation efficiency of the vulcanizing agent.

[0128] Comparing Comparative Example 3 with Example 3, as can be seen from Table 1 and Table 2, the vulcanizing agent in Comparative Example 1 was not surface-modified, and the sulfur-containing composition was pure sulfur particles. After pneumatic conveying in a closed pipeline, the particles in the sulfur-containing composition with a particle size range less than 48 μm increased significantly. Further combining Table 4, it can be known that the percentage value of the proportion of particles with a particle size less than 48 μm in the sulfur-containing composition after conveying compared to that before conveying in Comparative Example 1 increased significantly, and the thickness of the pipeline scaling layer in 1 hour was 10.1 mm, much higher than the sulfur-containing composition prepared in Example 3, further verifying that the vulcanizing agent powdering in Comparative Example 3 was serious and it was easy to cause adhesion and scaling in the conveying pipeline. By combining Table 3, it can be known that the recovery rate of the sulfur-containing composition in Comparative Example 3 after spraying was only 36.20%, indicating that the utilization rate of the vulcanizing agent in Comparative Example 3 was low and the conveying efficiency was poor.

[0129] For the sulfur-containing composition in Example 3, the vulcanizing agent (sulfur) was surface-modified by using carbon powder as a surface modifier. After the sulfur-containing composition was conveyed, the particles in the particle size range less than 48 μm did not increase significantly, indicating that the structure stability of the vulcanizing agent prepared in Example 3 was relatively strong; the percentage value of the proportion of particles with a particle size less than 300 mesh in the sulfur-containing composition in Example 3 after conveying increased less compared to the proportion of particles with a particle size less than 48 μm before conveying, and the thickness of the pipeline scaling layer in 1 hour was less than 0.1 mm, far lower than the sulfur-containing composition prepared in Comparative Example 3, and the recovery rate was as high as 97.80%. Therefore, the vulcanizing agent in the sulfur-containing composition prepared in Example 3 was surface-modified by using organic powder, and the structure stability of the vulcanizing agent was significantly improved, thereby promoting the utilization rate and conveying efficiency of the vulcanizing agent.

[0130] Further combining Table 4, in Examples 4 to 14, the surface of the vulcanizing agent was modified by using inorganic powder, organic powder, and a mixed powder containing inorganic powder and organic powder respectively. The prepared sulfur-containing compositions were pneumatically conveyed through a closed pipeline, and the percentage value of the proportion of particles with a particle size less than 48 μm before and after conveying did not change significantly, and the thickness of the pipeline scaling layer in 1 hour was much less than 10 mm. Thus, it was verified that using inorganic powder and / or organic powder as a surface modifier to modify the surface of the vulcanizing agent could effectively improve the structure stability of the vulcanizing agent.

[0131] The sulfur-containing compositions prepared in the above-mentioned examples all contained a vulcanizing agent and a surface modifier loaded on the surface of the vulcanizing agent. During the conveying process of each sulfur-containing composition, the vulcanizing agent particles were not easily powdered and were not easily adhered and scaled in the transportation tool, indicating that each vulcanizing agent had high stability, and the recovery rate of the spraying test was all as high as over 97.8%, and each vulcanizing agent maintained a high utilization rate.

[0132] Therefore, the sulfur-containing composition prepared by modifying the surface of a vulcanizing agent with inorganic powder materials and / or organic powder materials having a smaller particle size as a surface modifier in the embodiments of the present application has inorganic powder materials and / or organic powder materials with strong structural strength loaded on the surface of the vulcanizing agent to enhance the structural strength of the vulcanizing agent; and after the inorganic powder materials and / or organic powder materials are loaded on the surface of the vulcanizing agent as a surface modifier, the contact area between the vulcanizing agent and the external environment is reduced by the barrier of the surface modifier to synergistically enhance the stability of the vulcanizing agent, thereby reducing the occurrence of powdering, structural deformation and adhesion and scaling of the vulcanizing agent caused by collision, extrusion, etc. during transportation, and further effectively improving the utilization rate and transportation efficiency of the vulcanizing agent.

[0133] The technical features described above can be combined arbitrarily. Although all possible combinations of these technical features have not been described, any combination of these technical features should be considered to be covered by this specification as long as such a combination does not exist in contradiction.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sulfur-containing composition, characterized in that, it comprises a vulcanizing agent, and a surface modifier, the surface modifier is loaded on the surface of the vulcanizing agent, and the particle size of the surface modifier is smaller than that of the vulcanizing agent, and the surface modifier comprises inorganic powder and / or organic powder.

2. The sulfur-containing composition according to claim 1, characterized in that, by mass fraction, the content of the surface modifier in the sulfur-containing composition is 4% - 40%, optionally 5% - 37%; and / or, the content of the vulcanizing agent in the sulfur-containing composition is 60% - 96%, optionally 73% - 95%.

3. The sulfur-containing composition according to claim 1, characterized in that, at least part of the surface modifier is embedded in the surface of the vulcanizing agent.

4. The sulfur-containing composition according to claim 1, characterized in that, the vulcanizing agent comprises sulfur particles.

5. The sulfur-containing composition according to claim 4, characterized in that, the vulcanizing agent comprises sulfur, and the sulfur satisfies at least one of the following conditions: (Ⅰ) The particle size of the sulfur is 75μm - 1700μm; (Ⅱ) Based on the total number of the sulfur, the proportion of the sulfur with a particle size of 75μm - 1700μm is more than 32%.

6. The sulfur-containing composition according to claim 1, characterized in that, the surface modifier satisfies at least one of the following conditions: (Ⅰ) The particle size of the surface modifier is less than 75μm; (Ⅱ) Based on the total number of the surface modifier, the proportion of the surface modifier with a particle size less than 75μm is more than 85%.

7. The sulfur-containing composition according to claim 1, characterized in that, the surface modifier comprises two or more kinds of powders; Optionally, in the surface modifier, the mass ratio of any two kinds of powders is 1:(1 - 8); Optionally, the mass ratio of any two kinds of powders is 1:(1 - 4).

8. The sulfur-containing composition according to any one of claims 1 - 7, characterized in that, the inorganic powder comprises at least one of oxides, salts, hydroxides or non-metal simple substances; Optionally, the surface modifier comprises at least one of magnesium silicate, zinc oxide, silica, silica stone, clay, calcium hydroxide, calcium oxide, aluminum oxide, barium sulfate, magnesium oxide, calcium carbonate, aluminum silicate, zinc silicate; Optionally, the inorganic powder comprises at least one of talc powder, lime powder and quartz powder; Optionally, the organic powder comprises at least one of carbon powder and coal powder.

9. The preparation method of the sulfur-containing composition according to any one of claims 1 - 8, characterized in that, the preparation method comprises: grinding and mixing the vulcanizing agent and the surface modifier in a predetermined ratio to obtain the sulfur-containing composition.

10. Application of the sulfur-containing composition according to any one of claims 1 - 8 in the preparation of matte from laterite nickel ore.

Images