Sulfur-containing composition, preparation method therefor and use thereof

Abstract

Provided are a sulfur-containing composition, a preparation method therefor and the use thereof, belonging to the field of mining and metallurgy. The sulfur-containing composition comprises a sulfurizing agent and a surface modifier, the surface modifier being loaded on the surface of the sulfurizing agent, the particle size of the surface modifier being less than that of the sulfurizing agent, and the surface modifier comprising an inorganic powder material and / or an organic powder material. The surface of the sulfurizing agent is subjected to modification treatment by using the inorganic powder material and / or the organic powder material as the surface modifier, so as to improve the structural stability of the sulfurizing agent, thus reducing situations such as pulverization, structural deformation and bonding scaling caused by collision, pressing, etc., during conveying of the sulfurizing agent, and further effectively improving the utilization rate of and the conveying efficiency for the sulfurizing agent.

Description

Sulfur-containing composition and preparation method and application thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application number 2023116779626, filed with the Chinese Patent Office on December 8, 2023, entitled “Sulfur-containing composition, preparation method and application thereof,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure belongs to the field of mining and metallurgy, and in particular relates to a sulfur-containing composition, a preparation method thereof, and an application thereof. Background Art

[0004] Laterite nickel ore is generally prepared into nickel matte (also known as nickel matte) through reduction sulfidation smelting. 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) by a transportation tool (such as a conveyor belt or high-temperature chain plate or pipeline, etc.) to participate in the sulfidation.

[0005] However, in the related art, the utilization rate of the sulfiding agent used in sulfiding smelting is poor.

[0006] In view of this, the present disclosure is proposed.

[0007] Summary of the Invention

[0008] The present disclosure provides a sulfur-containing composition and a preparation method and application thereof, aiming to solve the problem of poor utilization rate of sulfurizing agents in the prior art.

[0009] A first aspect of the present disclosure provides a sulfur-containing composition, comprising a vulcanizing agent and a surface modifier, wherein 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.

[0010] The sulfur-containing composition provided by the present disclosure includes a vulcanizing agent and a surface modifier, wherein the surface modifier includes an inorganic powder and / or an organic powder. By using the inorganic powder and / or the organic powder as the surface modifier to modify the surface of the vulcanizing agent, the inorganic powder and / or the organic powder with a smaller particle size can be loaded on the surface of the vulcanizing agent with a larger particle size, thereby promoting the improvement of the structural stability of the vulcanizing agent. Moreover, after the inorganic powder and / or the organic powder is loaded on the surface of the vulcanizing agent as the surface modifier, the contact area between the vulcanizing agent and the external environment is reduced by the barrier of the surface modifier, so as to synergistically improve the structural stability of the vulcanizing agent. In this way, the occurrence of powdering, structural deformation and adhesion scaling of the vulcanizing agent caused by collision, extrusion, etc. during transportation can be reduced, thereby reducing the loss of the vulcanizing agent and the transportation resistance to improve the transportation efficiency. Moreover, during the vulcanization process, under the condition that a surfactant is present 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 disclosure can improve the delivery efficiency and utilization rate of the sulfiding agent.

[0011] In some embodiments, the surface modifier comprises 4% to 40% by mass, preferably 5% to 37% by mass, in the sulfur-containing composition; and / or the vulcanizing agent comprises 60% to 96% by mass, preferably 73% to 95% by mass. By adjusting the content of the surface modifier and / or vulcanizing agent in the sulfur-containing composition, the surface modifier can be loaded onto the surface of the vulcanizing agent to enhance stability, thereby improving the structural stability of the vulcanizing agent.

[0012] In some embodiments, at least a portion of the surface modifier is embedded in the surface of the vulcanizing agent. Smaller inorganic and / or organic powders are primarily present in the form of particles, which are at least partially embedded in the surface of the vulcanizing agent, helping to enhance stability during loading, thereby further improving the structural strength of the vulcanizing agent.

[0013] 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 during the vulcanization reaction. The granular sulfur allows smaller-sized surface modifiers to be more easily loaded onto the surface of the vulcanizing agent, allowing the small-sized surface modifiers to be partially embedded in the surface of the vulcanizing agent. Furthermore, the granular vulcanizing agent also helps improve the fluidity of the vulcanizing agent during transportation, reducing the probability of structural deformation and adhesion and scaling of the vulcanizing agent during transportation, thereby improving the utilization rate and transportation efficiency of the vulcanizing agent.

[0014] In some embodiments, the vulcanizing agent includes sulfur, and the sulfur satisfies at least one of the following conditions: (I) the sulfur has a particle size of 75 μm to 1700 μm; and (II) the sulfur with a particle size of 75 μm to 1700 μm accounts for at least 32% of the total sulfur. When the sulfur in the vulcanizing agent is in the particle size range of 75 μm to 1700 μm, it provides a relatively large specific surface area, which facilitates the loading of smaller-sized surface modifiers, thereby further enhancing the structural stability of the vulcanizing agent. When the sulfur with a particle size of 75 μm to 1700 μm accounts for at least 32% of the total sulfur, the sulfur loading with the surface modifier can enhance the overall stability of the vulcanizing agent and improve its fluidity during transport, thereby reducing the powdering, structural deformation, and adhesion and scaling caused by the collision and extrusion of sulfur particles during high-speed transport.

[0015] In some embodiments, the surface modifier meets 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 number of surface modifiers with a particle size less than 75 μm accounts for more than 85%. By designing the particle size of the surface modifier, surface modifiers with a particle size less than 75 μm are more easily loaded onto the surface of the vulcanizer. When the number of surface modifiers with a particle size less than 75 μm accounts for more than 85% of the total number of surface modifiers, the surface of the vulcanizer can load more surface modifier particles, thereby more effectively enhancing the structural stability of the vulcanizer.

[0016] In some embodiments, the surface modifier includes two or more powders; optionally, the mass ratio of any two powders in the surface modifier is 1:(1-8); optionally, the mass ratio of any two powders is 1:(1-4). By designing the surface modifier to include two or more powders, with the mass ratio of any two powders satisfying the above range, the multiple powders can jointly produce a synergistic effect on the surface of the vulcanizer, thereby further improving the structural stability of the vulcanizer.

[0017] In some embodiments, the inorganic powder comprises at least one of an oxide, a salt, a hydroxide, or a non-metallic element. Alternatively, the surface modifier comprises 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, and zinc silicate. Alternatively, the inorganic powder comprises at least one of talc, lime powder, and quartz powder. Alternatively, the organic powder comprises at least one of carbon powder and coal powder. The surface modifier, a smaller powder particle selected from at least one of the above substances, can be better loaded onto the surface of the vulcanizing agent, thereby improving the structural stability of the vulcanizing agent.

[0018] A second aspect of the present disclosure provides a method for preparing the aforementioned sulfur-containing composition, comprising grinding and mixing a vulcanizing agent and a surface modifier in a predetermined ratio to obtain the sulfur-containing composition. By grinding and mixing the vulcanizing agent and the surface modifier in the predetermined ratio, inorganic powders of smaller particle size can be stably loaded onto the surface of the vulcanizing agent of larger particle size, thereby improving the structural stability of the vulcanizing agent.

[0019] In some embodiments, grinding and mixing the vulcanizing agent and the surface modifier at a predetermined ratio includes: crushing and screening the vulcanizing agent to obtain vulcanizing agent particles; mixing the surface modifier and the vulcanizing agent particles at a predetermined ratio to obtain a mixed material; and subjecting the mixed material to centrifugal stirring and grinding and induced draft collection. The grinding and screening of the sulfur followed by mixing with the surface modifier at a predetermined ratio can improve the uniformity of the vulcanizing agent, thereby increasing the loading rate of the surface modifier on the surface of the vulcanizing agent; and the centrifugal stirring and grinding of the mixed material can ensure that the surface modifier is fully filled in the surface gaps of the vulcanizing agent particles, thereby further improving the structural stability of the vulcanizing agent.

[0020] In some embodiments, centrifugal stirring and grinding and induced draft collection of the mixed material includes: feeding the mixed material into a mill at a preset feeding rate for centrifugal stirring and grinding; and collecting the mixed material after centrifugal stirring and grinding using an induced draft fan to obtain a sulfur-containing composition. Centrifugal stirring and grinding of the mixed material by means of the mill allows for sufficient contact between the surface modifier and the vulcanizing agent, allowing the surface modifier to better penetrate and coat the surface of the vulcanizing agent particles, thereby achieving a better modification effect. After centrifugal stirring and grinding, the induced draft fan can be used to collect the sulfur-containing composition, effectively separating the sulfur-containing composition from other solid impurities to obtain a pure sulfur-containing composition product.

[0021] In some embodiments, the feed rate is 10 kg / min to 30 kg / min; and / or the mill frequency is 3 Hz to 7 Hz; and / or the induced draft fan frequency is 30 Hz to 50 Hz. Within this feed rate range, the residence time and fluidity of the mixed material in the mill can be ensured, avoiding uneven mixing or poor grinding results caused by excessively fast or slow feed rates. Within this mill frequency range, the 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 this induced draft fan frequency range, the collection efficiency can be improved and the incorporation of impurities in the sulfur-containing composition can be reduced.

[0022] A third aspect of the present disclosure provides use of the above-mentioned sulfur-containing composition in preparing matte from laterite nickel ore.

[0023] In some embodiments, the use of the above-mentioned sulfur-containing composition in preparing matte from laterite nickel ore includes: carrying the sulfur-containing composition on a transport vehicle and transporting it to a reaction site for a sulfidation reaction. By carrying the above-mentioned sulfur-containing composition on a transport vehicle and transporting it to a reaction site for a sulfidation reaction, the sulfiding agent in the sulfur-containing composition undergoes surface modification with a surface modifier, resulting in enhanced stability, effectively preventing the sulfiding agent from floating and scattering outside the transport vehicle. The sulfiding agent is also less likely to pulverize during transportation, preventing scaling on the transport vehicle and causing blockage, thereby greatly improving the utilization rate and transportation efficiency of the sulfiding agent.

[0024] In some embodiments, the use of the sulfur-containing composition in preparing matte from laterite nickel ore specifically includes: pneumatically conveying the sulfur-containing composition in a closed pipeline and injecting it into a reaction site for a sulfidation reaction. By pneumatically conveying the sulfur-containing composition in a closed pipeline, the sulfur-containing composition is ensured to be in contact with the external environment during transportation, thereby preventing volatilization, oxidation, or deliquescence of the sulfiding agent and improving the transportation safety of the sulfiding agent. The sulfiding agent in the sulfur-containing composition has strong structural stability, which can prevent the sulfiding agent from forming adhesion and scaling in the closed pipeline and spray gun, thereby effectively improving the utilization rate and transportation efficiency of the sulfiding agent.

[0025] Additional aspects and advantages of the present disclosure will be given in part in the description that follows and, in part, will be obvious from the description that follows, or will be learned through practice of the present disclosure. DETAILED DESCRIPTION

[0026] " scope " disclosed in the present disclosure is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and selected lower limit and upper limit define the boundary of special scope.The scope that this mode limits can be to include end value or not include end value, and can be combined arbitrarily, and promptly any lower limit can form a scope with any upper limit combination.For example, if the scope of 60-120 and 80-110 is listed for specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected.In addition, if the minimum range value 1 and 2 listed, and if the maximum range value 3,4 and 5 listed, then the following scope can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5.In the present disclosure, unless otherwise specified, numerical range " ab " represents the abbreviation of any real number combination between a and b, and wherein a and b are all real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0027] Unless otherwise specified, all embodiments and optional embodiments of the present disclosure can be combined with each other to form new technical solutions.

[0028] Unless otherwise specified, all technical features and optional technical features disclosed herein can be combined with each other to form a new technical solution.

[0029] Unless otherwise specified, all steps of the present disclosure may be performed 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) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0030] Unless otherwise specified, the terms "include" and "comprising" mentioned in this disclosure may be open-ended or closed-ended. For example, the terms "include" and "comprising" may also include or contain other components not listed, or may only include or contain the listed components.

[0031] Unless otherwise specified, the term "or" is inclusive in this disclosure. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied if any of the following conditions are met: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0032] As described in the above background technology, laterite nickel ore is generally prepared into nickel matte (also known as nickel matte) by reduction sulfide smelting. In 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) by a transportation tool (such as a conveyor belt or high-temperature chain plate or pipeline, etc.) to participate in the sulfidation.

[0033] However, in the related art, due to the poor structural stability of the vulcanizing agent, the vulcanizing agents will collide and squeeze with each other during transportation, making them prone to powderization and structural deformation, as well as adhesion and scaling, resulting in poor utilization of the vulcanizing agent.

[0034] In view of this, the present disclosure provides a sulfur-containing composition, which can improve the utilization rate and transportation efficiency of the sulfurizing agent.

[0035] An embodiment of the present disclosure provides a sulfur-containing composition, comprising a vulcanizing agent and a surface modifier, wherein 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.

[0036] In the embodiments of the present disclosure, the inorganic powder and / or organic powder used as the surface modifier has a high melting point, thermal stability and anti-friction properties, 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 a surface modifier to modify the surface of the vulcanizer, the inorganic powder and / or organic powder is loaded on the surface of the vulcanizer, which can reduce the contact area between the vulcanizer and the external environment, thereby effectively improving the structural stability of the vulcanizer. The sulfur-containing composition provided by the present disclosure is used in 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 sulfiding agent. Moreover, after being modified with a surface modifier, the sulfiding agent has a higher structural strength, which can reduce the occurrence of powdering, structural deformation, and adhesion and scaling caused by collision, extrusion, etc. during transportation of the sulfiding agent, thereby reducing the loss of the sulfiding agent and transportation resistance, thereby improving transportation efficiency. Moreover, during the sulfidation process, the presence of a surfactant on the surface of the sulfiding agent can also reduce the generation of sulfur dioxide by the sulfiding agent, thereby effectively improving the utilization rate of the sulfiding agent. Therefore, the sulfur-containing composition provided by the present disclosure can improve the transportation efficiency and utilization rate of the sulfiding agent.

[0037] It should be noted that the surface modifier in the present disclosure can be one or more inorganic powders, one or more organic powders, or a mixed powder formed by one or more inorganic powders and organic powders.

[0038] It should be understood that the inorganic powder in the present disclosure refers to powder formed by substances that do not contain carbon-hydrogen bonds. For example, the inorganic powder can be powder formed by compounds that do not contain carbon elements (such as magnesium silicate, calcium oxide), powder formed by a single substance (such as carbon element, silicon element), powder formed by compounds that contain carbon elements and do not contain carbon-hydrogen bonds (such as calcium carbonate, silicon carbide), and mixed powder formed by any of the above three substances.

[0039] It should be understood that the organic powder in the present disclosure refers to powder formed by substances containing carbon-hydrogen bonds. For example, the organic powder can be carbon powder prepared by sintering carbon-containing organic matter or coal powder prepared by crushing coal, or a mixed powder formed by the above two substances.

[0040] In addition, in the sulfur-containing composition provided by the present disclosure, the surface modifier is loaded on the surface of the vulcanizing agent, which means that the surface modifier is fixed or attached to the sulfur surface; illustratively, the surface modifier can interact with the vulcanizing agent through physical adsorption, chemical bonding, etc., thereby being fixed or attached to the surface of the vulcanizing agent to form a sulfur-containing composition in the form of a complex.

[0041] In the vulcanizing agent provided by the present disclosure, the surface modifier can completely cover the vulcanizing agent and / or partially cover 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 less likely to pulverize.

[0042] It should be clarified that the smaller particle size in the embodiments of the present disclosure means that the particle size of the surface modifier particles is smaller than that of the sulfiding agent particles; correspondingly, the larger particle size means that the particle size of the sulfiding agent particles is larger than that of the surface modifier particles.

[0043] It should be understood that in a high-temperature environment, the surface modifier loaded with the sulfiding agent in the sulfur-containing composition provided by the present disclosure can delay the volatilization of the sulfiding agent in a high-temperature environment by absorbing, transferring and dispersing heat, thereby further improving the effective utilization rate of the sulfiding agent during mining and metallurgy transportation.

[0044] In some embodiments, the content of the surface modifier in the sulfur-containing composition is 4% to 40%, optionally 5% to 37%, by mass; and / or the content of the vulcanizing agent in the sulfur-containing composition is 60% to 96%, optionally 73% to 95%.

[0045] It can be understood that, in this embodiment, the content of the surface modifier in the sulfur-containing composition is 4% to 40% by mass. 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 a range consisting of any two of the above values.

[0046] 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 within the range of 60% to 96%, or a range consisting of any two of the above values.

[0047] 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 embedded in the surface of the vulcanizing agent particles, thereby stably loading the surface modifier on the surface of the vulcanizing agent, thereby effectively improving the structural stability of the vulcanizing agent.

[0048] 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 a mixture of metal sulfide particles and sulfur particles. Both metal sulfide particles and / or sulfur particles can provide the loading points required by the surface modifier, allowing the surface modifier to effectively exert its modifying effect to enhance the structural stability of the vulcanizing agent. In addition, the granular vulcanizing agent helps promote the fluidity of the vulcanizing agent during transportation, improves the utilization rate and delivery efficiency of the vulcanizing agent, and is more easily evenly distributed in the reaction site or area, thereby improving the efficiency of the vulcanization reaction.

[0049] Furthermore, the metal sulfide particles in this embodiment refer to solid particles composed of a compound formed by a metal element and sulfur. 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 elemental sulfur.

[0050] In some embodiments, the vulcanizing agent includes sulfur, and the sulfur satisfies at least one of the following conditions: (I) the sulfur has a particle size of 75 μm to 1700 μm; and (II) based on the total amount of the sulfur, the sulfur with a particle size of 75 μm to 1700 μm accounts for at least 32%. It is understood that sulfur particles in the range of 75 μm to 1700 μm are more conducive to loading the surface modifier. Based on the total amount of the sulfur, the sulfur with a particle size of 75 μm to 1700 μm accounts for at least 32%, which can ensure that the sulfur-containing composition modified with the vulcanizing agent has suitable fluidity during transportation, thereby facilitating high-speed transportation of the vulcanizing agent.

[0051] 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 number of surface modifiers with a particle size of less than 75 μm accounts for more than 85%. It can be understood that the particle size of the surface modifier is less than 75 μm, which can ensure that the particle size of the surface modifier is small enough to better load on the surface of the vulcanizer, thereby ensuring the effectiveness of the modification effect. The smaller the particle size of the surface modifier particles, the larger the specific surface area of ​​the surface modifier particles, so as to more fully contact the surface of the vulcanizer, thereby achieving a more uniform and more effective modification effect. The proportion of surface modifiers with a particle size of less than 75 μm in the total number of high surface modifiers is more than 85%, which means that the surface modifiers with smaller particle sizes play a leading role in the entire modification process, thereby better achieving the modification of the vulcanizer surface.

[0052] In some embodiments, the inorganic powder includes at least one of oxides, salts, hydroxides or non-metallic elements; for example, the inorganic powder can be selected from inorganic powders containing any one of oxides, salts, hydroxides or non-metallic elements, or a mixed inorganic powder formed by any two or more of oxides, salts, hydroxides or non-metallic elements.

[0053] 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, and zinc silicate; the surface modifier can be selected from a powder containing any one of the above substances, or a mixed powder containing two or more of the above substances.

[0054] In some embodiments, the surface modifier includes at least one of talc powder, lime powder and quartz powder; the surface modifier can be any one of talc powder, lime powder and quartz powder, or a mixed powder containing two or more of the above substances.

[0055] In some embodiments, the surface modifier further includes organic powder, which includes at least one of carbon powder and coal powder. The organic powder can be any one of carbon powder and coal powder, or a mixed powder containing carbon powder and coal powder.

[0056] It should be understood that the talcum powder (Talcum Powder) in this embodiment is a fine powder obtained by grinding and processing talc ore, and the main component of talc ore is hydrous magnesium silicate. Lime powder (Lime Powder) is a fine powder obtained by high-temperature calcination of limestone (the main component of which is calcium carbonate). Carbon powder (Carbon Powder) is a powder form of fine particles made of carbon element, usually processed from organic raw materials such as coal, charcoal or graphite. Quartz powder (Quartz Powder) is a fine powder obtained by grinding and processing quartz ore, and its main component is silicon dioxide. Coal fines refers to coal with a particle size of less than 0.5 mm, usually obtained by grinding coal mines.

[0057] In some embodiments, the surface modifier includes two or more powders; wherein the mass ratio between any two powders is 1:(1-8), optionally 1:(1-4). The surface modifier includes two or more powders, and the mass ratio of any two powders satisfies the above range, so that the multiple powders can produce a synergistic effect on the surface of the vulcanizer to further improve the structural stability of the vulcanizer. For example, when the surface modifier includes two or more powders, the mass ratio of any two 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).

[0058] Another embodiment of the present disclosure provides a method for preparing the aforementioned sulfur-containing composition, comprising grinding and mixing a vulcanizing agent and a 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 onto the surface of the vulcanizing agent, thereby improving the structural stability of the vulcanizing agent.

[0059] In some embodiments, grinding and mixing the vulcanizing agent and the surface modifier at a predetermined ratio includes: crushing and screening the vulcanizing agent to obtain vulcanizing agent particles; mixing the surface modifier and the vulcanizing agent particles at a predetermined ratio to obtain a mixed material; and subjecting the mixed material to centrifugal stirring and grinding and induced draft collection. In this embodiment, the vulcanizing agent is crushed and screened to obtain vulcanizing agent particles within a target particle size range. The crushing of the vulcanizing agent increases the gaps on the particle surfaces, thereby increasing the loading rate of the surface modifier on the vulcanizing agent.

[0060] Further centrifugal stirring and grinding is performed on the mixture of the surface modifier and the vulcanizing agent particles in a predetermined ratio, so that the surface modifier can be embedded in the surface of the vulcanizing agent particles, so that the prepared vulcanizing agent has a stronger structural stability; and by induced draft collection of the mixture 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.

[0061] It should be understood that the induced wind collection in this embodiment refers to collecting the prepared sulfur-containing composition using wind power.

[0062] In some embodiments, the centrifugal stirring and grinding and induced draft collection of the mixed material includes: feeding the mixed material into a mill at a preset feeding speed for centrifugal stirring and grinding; and using an induced draft fan to collect the mixed material after centrifugal stirring and grinding to obtain a sulfur-containing composition.

[0063] The mill in this embodiment is a mechanical device used to crush, stir, and grind materials. During the centrifugal stirring and grinding process, the mill generates centrifugal force through rotation, subjecting the mixed material to impact, friction, and shear forces within the mill. This effectively combines the sulfiding agent particles with the surface modifier, depositing the surface modifier on the surface of the sulfiding agent. The induced draft fan is a mechanical device used to generate airflow or provide gas transport to blow the ground material out of the mill for collection, ultimately producing a sulfur-containing composition.

[0064] In some embodiments, the feed rate is 10-30 kg / min; and / or the mill frequency is 3-7 Hz, optionally 5 Hz; and / or the induced draft fan frequency is 30-50 Hz, optionally 40 Hz. Appropriate control of the feed rate can ensure the normal operation of the mill and prevent excessive or insufficient feed from entering the mill. Controlling the mill frequency facilitates more complete centrifugal grinding of the mixed material. Controlling the induced draft fan frequency facilitates efficient collection of the sulfur-containing composition.

[0065] Another embodiment of the present disclosure provides the use of the aforementioned sulfur-containing composition in the preparation of matte from laterite nickel ore, comprising loading the sulfur-containing composition onto a transport vehicle and transporting it to a reaction site for a sulfurization reaction. The sulfur-containing composition in this embodiment is less likely to pulverize on the transport vehicle, thereby reducing fouling and clogging of the transport vehicle, thereby achieving efficient and stable delivery of the sulfurizing agent.

[0066] In some embodiments, the application of the sulfur-containing composition in preparing matte from laterite nickel ore specifically includes: carrying a sulfiding agent in a closed pipe for pneumatic transportation, and injecting it into a reaction site for sulfidation reaction.

[0067] It should be understood that "matte" in this embodiment refers to an intermediate product produced during the smelting process of laterite nickel ore, typically a miscible solution of various metal sulfides. When preparing matte from laterite nickel ore, the aforementioned sulfur-containing composition serves as a sulfur source during the sulfurization reaction. The sulfur in the sulfur-containing composition reacts with the metal elements in the laterite nickel ore to produce matte.

[0068] Pneumatic conveying in the present embodiment refers to a method of transporting a vulcanizing agent from one location to another using gas (usually air) as a transmission medium. By adjusting the gas flow rate and pressure, the gas is formed into a high-speed flow in a closed pipe to achieve the purpose of high-speed transport of the vulcanizing agent. The sulfur-containing composition is carried in a closed pipe, and the closed pipe has a high airtightness and can be highly adapted to the high-temperature environment during pyrometallurgy to meet the transportation requirements of the sulfur-containing composition particles. The spraying in the present embodiment can be achieved by a spray gun arranged at the end of the closed pipe. By adjusting the angle of the spray gun, the sulfur-containing composition transported by the closed pipe can be directly sprayed into the reaction site (molten pool) to carry out the vulcanization reaction.

[0069] The following examples use sulfur as a sulfurizing agent to more specifically describe the present disclosure. These examples are intended for illustrative purposes only, as various modifications and variations within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise stated, all reagents and starting materials used in the examples are commercially available or synthesized according to conventional methods, and all instruments used in the examples are commercially available.

[0070] Example 1

[0071] An appropriate amount of talcum powder and crushed and sieved sulfur granules, wherein sulfur granules with a particle size of less than 48 μm account for 46.21% of the total sulfur granules (see Table 1, S-001 for details), is prepared; a mixture of sulfur granules and talcum powder is prepared at a mass ratio of 100:5; the mixture is fed into a mill for centrifugal stirring and grinding at a feed rate of 30 kg / min and a control frequency of 5 Hz; the mixture after centrifugal stirring and grinding is collected in a collection container via an induced draft fan provided by an induced draft fan to obtain a sulfur-containing composition; the induced draft fan frequency is controlled at 40 Hz.

[0072] Example 2

[0073] An appropriate amount of lime powder and crushed and sieved sulfur granules, wherein sulfur granules with a particle size of less than 48 μm account for 1.1% of the total sulfur granules (see Table 1, S-002 for details), are prepared; a mixture having a mass ratio of sulfur granules to lime powder of 100:5 is prepared; the mixture is fed into a mill for centrifugal stirring and grinding at a feed rate of 30 kg / min and a control frequency of 5 Hz; the mixture after centrifugal stirring and grinding is fed into a collection container via an induced draft fan provided by the induced draft fan to be collected, thereby obtaining a sulfur-containing composition; the induced draft fan frequency is controlled at 40 Hz.

[0074] Example 3

[0075] An appropriate amount of carbon powder and crushed and sieved sulfur granules, wherein sulfur granules with a particle size of less than 48 μm account for 7.52% of the total sulfur granules (see Table 1, S-003 for details), are prepared; a mixture having a mass ratio of sulfur granules to carbon powder of 100:5 is prepared; the mixture is fed into a mill for centrifugal stirring and grinding at a feed rate of 30 kg / min and a control frequency of 5 Hz; the mixture after centrifugal stirring and grinding is fed into a collection container via an induced draft fan provided by the induced draft fan to be collected to obtain a sulfur-containing composition; the frequency of the induced draft fan is controlled at 40 Hz.

[0076] Example 4

[0077] Appropriate amounts of talcum powder, lime powder, and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules: talcum powder: lime powder of 100:6:6; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after the centrifugal stirring and grinding treatment is fed into a collection container through an airflow provided by an induced draft fan to be collected to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0078] Example 5

[0079] Appropriate amounts of carbon powder, talcum powder, and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules: carbon powder: talcum powder of 100:5:5; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after the centrifugal stirring and grinding treatment is fed into a collection container through an airflow provided by an induced draft fan to be collected to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0080] Example 6

[0081] Appropriate amounts of carbon powder, talcum powder, lime powder, and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules: carbon powder: talcum powder: lime powder of 100:6:6:6; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after the centrifugal stirring and grinding treatment is fed into a collection container through an 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.

[0082] Example 7

[0083] An appropriate amount of quartz powder and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules to quartz powder of 100:5; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after centrifugal stirring and grinding is fed into a collection container through an airflow provided by an induced draft fan to be collected to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0084] Example 8

[0085] Appropriate amounts of quartz powder, carbon powder, and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules: quartz powder: carbon powder of 100:9:9; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after the centrifugal stirring and grinding treatment is fed into a collection container through an airflow provided by an induced draft fan to be collected to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0086] Example 9

[0087] Appropriate amounts of quartz powder, talcum powder, and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules: quartz powder: talcum powder of 100:9:9; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after the centrifugal stirring and grinding treatment is fed into a collection container through an airflow provided by an induced draft fan to be collected to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0088] Example 10

[0089] Appropriate amounts of quartz powder, lime powder, and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules: quartz powder: lime powder of 100:9:9; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after the centrifugal stirring and grinding treatment is fed into a collection container through an airflow provided by an induced draft fan to be collected to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0090] Example 11

[0091] Appropriate amounts of quartz powder, lime powder, talc powder, and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules: quartz powder: lime powder: talc powder of 100:9:9:9; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after the centrifugal stirring and grinding treatment is fed into a collection container through an 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.

[0092] Example 12

[0093] Appropriate amounts of quartz powder, lime powder, talc powder, carbon powder, and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules: quartz powder: lime powder: talc powder: carbon powder of 100:9:9:9:9; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after the centrifugal stirring and grinding treatment is fed into a collection container through an 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.

[0094] Example 13

[0095] Appropriate amounts of quartz powder, lime powder, carbon powder, and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules: quartz powder: lime powder: carbon powder of 100:9:9:9; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after the centrifugal stirring and grinding treatment is fed into a collection container through an airflow provided by an induced draft fan to be collected to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0096] Example 14

[0097] Appropriate amounts of lime powder, talcum powder, and crushed and sieved sulfur granules are taken to prepare a mixture with a mass ratio of sulfur granules: lime powder: talcum powder of 100:5:5; the mixture is fed into a mill for centrifugal stirring and grinding treatment, the feeding speed is controlled at 30 kg / min, and the control frequency of the mill is 5 Hz; the mixture after the centrifugal stirring and grinding treatment is fed into a collection container through an airflow provided by an induced draft fan to be collected to obtain a sulfur-containing composition, and the frequency of the induced draft fan is controlled at 40 Hz.

[0098] Comparative Example 1

[0099] An appropriate amount of the crushed and sieved sulfur granules of Example 1 was taken, wherein the sulfur granules with a particle size of less than 48 μm accounted for 46.21% of the total sulfur granules (see Table 1, S-001 for details); the sulfur granules were fed into a mill for centrifugal stirring and grinding treatment, the feeding rate was controlled to be 30 kg / min, and the control frequency of the mill was 5 Hz; the mixture after centrifugal stirring and grinding was fed into a collection container through an airflow provided by an induced draft fan, and collected to obtain a sulfur-containing composition, and the frequency of the induced draft fan was controlled to be 40 Hz.

[0100] Comparative Example 2

[0101] An appropriate amount of the crushed and sieved sulfur granules of Example 2 was taken, wherein the sulfur granules having a particle size of less than 48 μm accounted for 1.1% of the total sulfur granules (see Table 1, S-002 for details); the sulfur granules were fed into a mill for centrifugal stirring and grinding at a feed rate of 30 kg / min and a control frequency of 5 Hz; the mixture after centrifugal stirring and grinding was passed into a collection container via an induced draft fan provided by an induced draft fan, where the induced draft fan was controlled at 40 Hz to obtain a sulfur-containing composition.

[0102] Comparative Example 3

[0103] An appropriate amount of the crushed and sieved sulfur granules of Example 3 was taken, wherein the sulfur granules having a particle size of less than 48 μm accounted for 7.52% of the total sulfur granules (see Table 1, S-003 for details); the sulfur granules were fed into a mill for centrifugal stirring and grinding at a feed rate of 30 kg / min and a control frequency of 5 Hz; the mixture after centrifugal stirring and grinding was collected in a collection container via an induced draft fan provided by an induced draft fan to obtain a sulfur-containing composition, and the induced draft fan frequency was controlled to 40 Hz.

[0104] Test section

[0105] (1) Undersize sample test

[0106] According to the national standard GB / T6003.1-2012, a test sieve is used to separate the mixed particles and a balance with an accuracy of 0.001g is used to measure the total weight m1 of the sample and the mass m2 of the sample passing through the test sieve. The mass proportion of the sample passing through the test sieve is (m1-m2)×100%.

[0107] (2) Recovery rate test

[0108] Using a 0.1kg crane scale, after zeroing, measure the weight of the ton bag and record it as m3. After zeroing the 0.1kg crane scale again, weigh the ton bag filled with material and record it as m4. The total mass of the sulfur-containing composition measured is (m4-m3). The total mass of the sulfur-containing composition collected after injection and the ton bag is m5, so the mass of the sulfur-containing composition collected after injection is (m5-m3). Therefore, the recovery rate is equal to (m5-m3) / (m4-m3)×100%.

[0109] (3) Pipeline scale thickness test

[0110] Use a vernier caliper with an accuracy of 0.01mm to measure the inner diameter of the pipe. Before delivering the vulcanizer, bring the measuring jaws together and ensure that the 0-line of the secondary scale is aligned with the 0-line of the main scale. Place the pipe to be measured between the outer measuring jaws. When the measuring jaws are firmly in contact with the pipe, read the thickness and record it as d1. After delivering the vulcanizer, select the scaled area in the pipe and measure it with the outer measuring jaws. The reading is the thickness of the structural layer and the pipe, which is d2. The thickness of the structural layer is d2-d1.

[0111] The above recovery rate and pipeline scaling thickness tests were conducted at 55cm 3 The test was conducted under the condition of nitrogen (industrial grade) flowing through the test chamber at a flow rate of 1 / min. Two rounds of heating and cooling tests were performed, each lasting 1 hour. Starting from room temperature in the test chamber, the temperature was heated to 220°C at a rate of 20°C / min, then cooled to room temperature at a rate of 20°C / min, and then heated to 220°C at a rate of 20°C / min.

[0112] The sulfur particles of Examples 1 to 3 were analyzed for particle size. The analysis results are shown in Table 1 below:

[0113] Table 1. Particle size analysis of sulfur powder in Examples 1 to 3

[0114] The sulfur-containing compositions prepared in Examples 1 to 3 and the comparative examples were pneumatically conveyed in closed pipes, and the particle size of the sulfur-containing compositions after conveyance was analyzed. The analysis results are shown in Table 2 below:

[0115] Table 2. Particle size analysis of the sulfur-containing compositions obtained in Examples 1 to 3 and the comparative examples after transportation

[0116] The sulfur-containing compositions prepared in Examples 1 to 3 and the comparative examples were respectively sprayed through a spray gun and then recovered to verify the utilization rate of the sulfiding agent through a spray recovery test. The test data results are shown in Table 3 below:

[0117] Table 3. Test data of injection recovery of sulfur-containing compositions prepared in Examples 1 to 3 and comparative examples

[0118] The sulfur-containing compositions prepared in each embodiment and comparative example were pneumatically conveyed in a closed pipeline. Each sulfur-containing composition was sieved with 300 mesh (48 μm) before and after conveying. The thickness of the scale layer formed on the sulfur-containing composition in the pipeline after one hour was measured. The test results are shown in Table 4 below:

[0119] Table 4. Statistics of sulfur-containing composition transportation test data

[0120] The sulfur-containing compositions prepared in the Examples and Comparative Examples were analyzed in conjunction with Tables 1 to 4:

[0121] Comparative Example 1 is compared with Example 1. As shown in Tables 1 and 2, the sulfiding agent in Comparative Example 1 has not been surface-modified, and the sulfur-containing composition is pure sulfur particles. After pneumatic conveying in a closed pipeline, the number of particles with a particle size of less than 48 μm in the sulfur-containing composition is significantly increased. Further combined with Table 4, it can be seen that the percentage of particles with a particle size of less than 48 μm after conveying the sulfur-containing composition in Comparative Example 1 is significantly increased compared with the percentage of particles with a particle size of less than 48 μm before conveying, and the thickness of the scale layer in the pipeline after 1 h is 10 mm, which is much higher than that of the sulfur-containing composition prepared in Example 1. This further verifies that the sulfiding agent in Comparative Example 1 is severely powdered and easily forms adhesion scale in the conveying pipeline. Combined with Table 3, it can be seen that the recovery rate of the sulfur-containing composition in Comparative Example 1 after injection is only 20.60%, indicating that the utilization rate of the sulfiding agent in Comparative Example 1 is low and the conveying efficiency is poor.

[0122] In Example 1, the sulfur-containing composition is surface-modified by using talc as a surface modifier to modify the vulcanizing agent (sulfur). After the sulfur-containing composition is transported, there is no significant increase in the number of particles with a particle size of 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. In Example 1, the percentage of particles with a particle size of less than 48 μm after transportation increases less than the percentage of particles with a particle size of less than 48 μm before transportation, and the thickness of the scale layer in the pipeline after 1 hour is less than 0.1 mm, which is much lower than that of the sulfur-containing composition prepared in Comparative Example 1. The recovery rate is as high as 98.00%. Therefore, in the sulfur-containing composition prepared in Example 1, the structural stability of the vulcanizing agent is significantly improved after the surface modification of the vulcanizing agent by the inorganic powder, thereby improving the utilization rate and transportation efficiency of the vulcanizing agent.

[0123] Comparative Example 2 is compared with Example 2. As can be seen from Tables 1 and 2, the sulfur-containing composition in Comparative Example 2 has not been subjected to surface modification treatment, and the sulfur-containing composition is pure sulfur particles. After pneumatic conveying in a closed pipeline, the number of particles with a particle size of less than 48 μm in the sulfur-containing composition is significantly increased. Further combined with Table 4, it can be seen that the percentage of particles with a particle size of less than 48 μm after conveying the sulfur-containing composition in Comparative Example 1 is significantly increased compared with the percentage of particles with a particle size of less than 48 μm before conveying, and the thickness of the scale layer in the pipeline after 1 hour is 10.2 mm, which is much higher than that of the sulfur-containing composition prepared in Example 2. This further verifies that the sulfiding agent in Comparative Example 2 is severely powdered and easily forms adhesion scale in the conveying pipeline. Combined with Table 3, it can be seen that the recovery rate of the sulfur-containing composition in Comparative Example 2 after injection is only 24.80%, and the loss of sulfiding agent is serious, indicating that the utilization rate of the sulfiding agent in Comparative Example 2 is low and the conveying efficiency is poor.

[0124] 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 significant increase in the number of particles with a particle size of 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. In Example 2, the percentage of particles with a particle size of less than 48 μm after transportation increases less than the percentage of particles with a particle size of less than 48 μm before transportation, and the thickness of the scale layer in the pipeline after 1 hour is 0, which is much 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 injection is as high as 97.90%. Therefore, the structural stability of the vulcanizing agent in the sulfur-containing composition prepared in Example 2 is significantly improved by surface modification with inorganic powder, thereby promoting the utilization rate and transportation efficiency of the vulcanizing agent.

[0125] Comparative Example 3 is compared with Example 3. As can be seen from Tables 1 and 2, the sulfiding agent in Comparative Example 1 has not been surface-modified, and the sulfur-containing composition is pure sulfur particles. After pneumatic conveying in a closed pipeline, the number of particles with a particle size of less than 48 μm in the sulfur-containing composition is significantly increased. Further combined with Table 4, it can be seen that the percentage of particles with a particle size of less than 48 μm after conveying the sulfur-containing composition in Comparative Example 1 is significantly increased compared with the percentage of particles with a particle size of less than 48 μm before conveying, and the thickness of the scale layer in the pipeline after 1 hour is 10.1 mm, which is much higher than that of the sulfur-containing composition prepared in Example 3. This further verifies that the sulfiding agent in Comparative Example 3 is severely powdered and easily forms adhesion scale in the conveying pipeline. Combined with Table 3, it can be seen that the recovery rate of the sulfur-containing composition in Comparative Example 3 after injection is only 36.20%, indicating that the utilization rate of the sulfiding agent in Comparative Example 3 is low and the conveying efficiency is poor.

[0126] In Example 3, the sulfur-containing composition uses carbon powder as a surface modifier to modify the surface of the vulcanizing agent (sulfur). After the sulfur-containing composition is transported, there is no significant increase in the number of particles with a particle size of less than 48 μm, indicating that the structural stability of the vulcanizing agent prepared in Example 3 is relatively strong. In Example 3, the percentage of particles with a particle size of less than 300 mesh after transportation increases less than the percentage of particles with a particle size of less than 48 μm before transportation, and the thickness of the scale layer on the pipeline after 1 hour is less than 0.1 mm, which is much lower than that of the sulfur-containing composition prepared in Comparative Example 3. The recovery rate is as high as 97.80%. Therefore, the structural stability of the vulcanizing agent in the sulfur-containing composition prepared in Example 3 is significantly improved by surface modification with organic powder, thereby promoting the utilization rate and transportation efficiency of the vulcanizing agent.

[0127] Further combined with Table 4, Examples 4 to 14 respectively used inorganic powder, organic powder, and a mixed powder containing inorganic powder and organic powder to modify the surface of the sulfiding agent. The obtained sulfur-containing compositions were pneumatically conveyed through a closed pipeline. The percentage of particles with a particle size less than 48 μm before and after transportation did not change significantly, and the thickness of the scale layer in the pipeline for 1 h was much less than 10 mm. This verifies that inorganic powder and / or organic powder as a surface modifier for surface modification of the sulfiding agent can effectively improve the structural stability of the sulfiding agent.

[0128] The sulfur-containing compositions prepared in the above-mentioned embodiments all contain a vulcanizing agent and a surface modifier supported on the surface of the vulcanizing agent. During the transportation of each sulfur-containing composition, the vulcanizing agent particles are not easily powdered and are not easily adhered and scaled in the transportation vehicle, indicating that each vulcanizing agent has high stability. The recovery rate of the injection test is as high as over 97.8%, and each vulcanizing agent maintains a high utilization rate.

[0129] Therefore, the embodiments of the present disclosure provide a method for modifying the surface of a sulfiding agent with a larger particle size by using inorganic powder and / or organic powder with a smaller particle size as a surface modifier to prepare a sulfur-containing composition, wherein inorganic powder and / or organic powder with a stronger structural strength is loaded on the surface of the sulfiding agent to enhance the structural strength of the sulfiding agent; and after the inorganic powder and / or organic powder is loaded on the surface of the sulfiding agent as a surface modifier, the contact area between the sulfiding agent and the external environment is reduced by the barrier of the surface modifier, so as to synergistically enhance the stability of the sulfiding agent, thereby reducing the occurrence of powdering, structural deformation and adhesion scaling of the sulfiding agent caused by collision, extrusion, etc. during transportation, thereby effectively improving the utilization rate and transportation efficiency of the sulfiding agent.

[0130] The various technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification as long as such combination does not conflict.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure. Industrial Applicability

[0132] In summary, the sulfur-containing composition provided by the present disclosure includes a vulcanizing agent and a surface modifier. Inorganic powder and / or organic powder is used as a surface modifier to modify the surface of the vulcanizing agent to improve the structural stability of the vulcanizing agent, thereby reducing the occurrence of powdering, structural deformation, and adhesion scaling of the vulcanizing agent caused by collision, extrusion, etc. during transportation, thereby effectively improving the utilization rate and transportation efficiency of the vulcanizing agent.

Claims

1. A sulfur-containing composition, characterized in that include Vulcanizing agents, and A 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 comprises inorganic powder and / or organic powder.

2. The sulfur-containing composition according to claim 1, characterized in that Calculated 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 optionally 73% to 95%.

3. The sulfur-containing composition according to claim 1, characterized in that At least a portion of the surface modifying agent is embedded in the surface of the vulcanizing agent.

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

5. The sulfur-containing composition according to claim 4, characterized in that 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 amount of the sulfur with a particle size of 75 μm-1700 μm accounts for 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 75 μm; (II) Based on the total amount of the surface modifiers, the amount of the surface modifiers having a particle size less than 75 μm accounts for more than 85%.

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

8. The sulfur-containing composition according to any one of claims 1 to 7, characterized in that The inorganic powder includes at least one of oxides, salts, hydroxides or non-metallic elements; 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, and zinc silicate; Optionally, the inorganic powder includes at least one of talcum powder, lime powder and quartz powder; Optionally, the organic powder includes at least one of carbon powder and coal powder.

9. The method for preparing a sulfur-containing composition according to any one of claims 1 to 8, characterized in that: The preparation method comprises: The sulfur-containing composition is obtained by grinding and mixing the sulfurizing agent and the surface modifier at a predetermined ratio.

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

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