Process for reducing the arsenic content of antimony concentrates

Abstract

The application provides a process for reducing the content of arsenic in antimony concentrate, which comprises adding dextrin and hydroxyl polyacrylamide to inhibit arsenic in the ore slurry during the heavy dressing slurry mixing process, adding lead nitrate as an antimony activator, butyl ammonium as an antimony collector and pine oil as a foaming agent, so that the antimony in the heavy dressing slurry can float under the combined action of the above flotation reagents and the arsenic minerals are further inhibited, and the arsenic in the antimony concentrate can be removed by the heavy dressing more easily. The test results show that, compared with the process of single flotation or single heavy dressing, the process of adding flotation reagents to the heavy dressing operation can effectively reduce the content of arsenic in the antimony concentrate, the process equipment is simple, and the indexes are stable. In addition, the process does not use toxic reagents such as cyanide, is environmentally friendly and non-polluting, and can realize green and efficient separation of antimony and arsenic.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of resources and environment, and particularly relates to a process for reducing the content of arsenic in antimony concentrate. BACKGROUND

[0002] Antimony concentrate is the main raw material for antimony smelting, and is often associated with arsenopyrite, pyrite and other sulfide ores in antimony sulfide ore deposits. Due to the similar floatability of stibnite and arsenopyrite, the arsenic content in antimony concentrate products exceeds the standard, and the presence of arsenic not only reduces the purity of antimony, but also affects the quality, sales channels and price of antimony products, and brings serious environmental problems to the subsequent smelting process.

[0003] In the antimony-arsenic separation process of the related art, a high-alkalinity, cyanide and strong-oxidation reagent system is often used, but there are problems such as high-alkalinity being not conducive to gold recovery, cyanide being highly toxic, strong oxidant having small difference in oxidation of antimony and arsenic, and low separation precision, so that green and efficient separation of antimony and arsenic cannot be achieved.

[0004] Therefore, the related art has the following technical problems: the traditional antimony-arsenic separation process cannot effectively achieve deep separation of arsenic and antimony, resulting in poor reduction effect of arsenic content in antimony concentrate and low separation precision. SUMMARY

[0005] In view of the above problems in the related art, the present application provides a process for reducing the content of arsenic in antimony concentrate, which adds dextrin and hydroxypropyl acrylamide as arsenic inhibitors, lead nitrate as an antimony activator, butyl ammonium as an antimony collector, and frothering agent menthol oil for slurry conditioning, and then performs gravity separation, so that antimony minerals float more easily into gravity separation tailings, and arsenic minerals are more easily inhibited into gravity separation concentrate; the gravity separation process is used to add flotation reagents, so as to strengthen the gravity separation effect and reduce the content of arsenic in antimony concentrate.

[0006] The specific application content is as follows:

[0007] The present application provides a process for reducing the content of arsenic in antimony concentrate, which includes the following steps:

[0008] S1, grinding the antimony concentrate containing arsenic to form a slurry;

[0009] S2, adding appropriate amounts of arsenic inhibitors dextrin and hydroxypropyl acrylamide, antimony activator lead nitrate, antimony collector butyl ammonium and frothering agent menthol oil to the slurry for slurry conditioning to obtain gravity separation slurry;

[0010] S3, performing gravity separation on the gravity separation slurry to obtain antimony concentrate, arsenic-containing product and middlings;

[0011] S4, returning the middlings to step S2 and repeating steps S2-S3;

[0012] The adding amount of the dextrin is 10-1200 g / t of ore; the adding amount of the hydroxyl polyacrylamide is 50-1400 g / t of ore; the adding amount of the lead nitrate is 100-1200 g / t of ore; the adding amount of the butyl ammonium is 5-150 g / t of ore; and the adding amount of the pine alcohol oil is 5-130 g / t of ore.

[0013] Optionally, in step S1, the grinding fineness of the antimony concentrate is 60-140 mesh.

[0014] Optionally, in step S2, the adding amount of the dextrin is 100-1000 g / t of ore.

[0015] Optionally, in step S2, the adding amount of the hydroxyl polyacrylamide is 100-1000 g / t of ore.

[0016] Optionally, in step S2, the adding amount of the lead nitrate is 200-1000 g / t of ore.

[0017] Optionally, in step S2, the adding amount of the butyl ammonium is 10-100 g / t of ore.

[0018] Optionally, in step S2, the adding amount of the pine alcohol oil is 10-100 g / t of ore.

[0019] Optionally, in step S2, the pH of the slurry preparation process is 5.5-7.5.

[0020] Optionally, in step S3, the gravity separation is performed by using a spiral chute or a shaking table.

[0021] Optionally, in step S2, the slurry preparation time is 3-10 minutes, and in step S3, the gravity separation is performed 1-5 times.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] The present application provides a process for reducing the arsenic content in antimony concentrate, which comprises: grinding the arsenic-containing antimony concentrate to form a slurry; then adding appropriate amounts of arsenic inhibitors dextrin and hydroxyl polyacrylamide, antimony activator lead nitrate, antimony collector butyl ammonium and foaming agent pine alcohol oil to the slurry to prepare a gravity separation slurry; performing gravity separation on the gravity separation slurry to obtain antimony concentrate, arsenic-containing product and middlings; returning the middlings to the slurry preparation process and repeating the gravity separation operation.

[0024] The process for reducing the content of arsenic in antimony concentrate provided by the application forms a slurry after grinding the antimony concentrate containing arsenic, and the arsenic in the slurry is inhibited by adding dextrin and hydroxypropyl acrylamide. The process has low cost, and lead nitrate is used as an antimony activator, butyl ammonium is used as an antimony collector, and pine oil is used as a foaming agent. Under the combined action of the above flotation reagents, the antimony in the slurry can easily float into the heavy separation tailings, and the arsenic minerals are easily inhibited into the heavy separation concentrate. The arsenic in the antimony concentrate is removed by gravity separation, and the antimony collector, the antimony activator and the arsenic inhibitor are added to the system. The process has simple equipment, stable indicators, and effectively improves the separation precision of antimony and arsenic.

[0025] In addition, compared with the traditional antimony-arsenic separation process, the application does not use toxic reagents such as cyanide, is environmentally friendly and pollution-free, and can realize green and efficient separation of antimony and arsenic. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0027] Figure 1 The process flow diagram for reducing the content of arsenic in antimony concentrate provided by the embodiment of the application is shown.

[0028] Figure 2 The process flow diagram for reducing the content of arsenic in antimony concentrate provided by the embodiment 1 of the application is shown.

[0029] Figure 3 The process flow diagram for reducing the content of arsenic in antimony concentrate provided by the comparative example 1 is shown.

[0030] Figure 4 The process flow diagram for reducing the content of arsenic in antimony concentrate provided by the comparative example 2 is shown. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting on the present application or its applications or uses. Based on the embodiments in the present application, any product that is the same or similar to the present application obtained by anyone under the inspiration of the present application or by combining the present application with other prior art features falls within the protection scope of the present application. In addition, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0032] If the specific experimental steps or conditions are not indicated in the embodiments, the operation or conditions can be performed according to the conventional experimental steps described in the prior art in the field. If the reagents and other instruments used are not indicated by the manufacturers, they are all conventional reagent products that can be obtained by purchase. In addition, the drawings are only schematic illustrations of the embodiments of the present application, and are not necessarily drawn to scale. The same reference signs in the drawings represent the same or similar parts, and thus repeated description thereof will be omitted. Some block diagrams shown in the drawings are functional entities, and do not necessarily correspond to physically or logically independent entities.

[0033] The technologies, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but under appropriate circumstances, the technologies, methods and devices should be regarded as part of the present application.

[0034] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.

[0035] China is the country with the most abundant antimony resources in the world, and the reserves and production are the largest in the world. Hunan is the largest antimony producing area in China, and Xikuangshan in Lengshuijiang City is known as the "world antimony capital". In addition, there are also a large number of antimony deposits in Guangxi, Guizhou, Yunnan and Gansu. Antimony deposits in these areas are often associated with arsenic and other elements, increasing the complexity of antimony-arsenic separation.

[0036] Arsenopyrite, also known as arsenic pyrite, has the chemical formula FeAsS and is a kind of iron sulfide arsenide mineral. In antimony ore, arsenopyrite is the main carrier mineral of arsenic, often closely associated with antimony minerals, which affects the quality of antimony products, sales channels and prices, and brings serious environmental problems to the subsequent smelting process, and is the key object in the process of antimony-arsenic separation.

[0037] In the current antimony-arsenic separation process, high alkalinity, cyanide and strong oxidizing reagent system are often used, but there are problems such as high alkalinity being not conducive to gold recovery, cyanide being highly toxic, strong oxidizing agent having small difference in oxidation of antimony and arsenic, and low separation precision, so that green and efficient separation of antimony and arsenic cannot be achieved.

[0038] Therefore, the present application provides a process for reducing the arsenic content in antimony concentrate, Figure 1 The process flow diagram of the process for reducing the arsenic content in antimony concentrate provided by the embodiment of the present application is shown in the figure. Figure 1 As shown in the figure, the process comprises the following steps:

[0039] S1, grinding the antimony concentrate containing arsenic to form a slurry;

[0040] S2, adding appropriate amounts of arsenic inhibitor dextrin and hydroxypropyl acrylamide, antimony activator lead nitrate, antimony collector butyl ammonium and foaming agent pine oil to the slurry to obtain a gravity separation slurry;

[0041] S3, performing gravity separation on the gravity separation slurry to obtain antimony concentrate, arsenic-containing product and middlings;

[0042] S4, returning the middlings to step S2 and repeating the steps S2-S3 operations;

[0043] The addition amount of the dextrin is 10-1200 g / t per ton of ore; the addition amount of the hydroxypropyl acrylamide is 50-1400 g / t; the addition amount of the lead nitrate is 100-1200 g / t; the addition amount of the butyl ammonium is 5-150 g / t; and the addition amount of the pine oil is 5-130 g / t.

[0044] The process for reducing the arsenic content in antimony concentrate provided by the present application grinds the antimony concentrate containing arsenic to form a slurry, suppresses the arsenic in the slurry by adding dextrin and hydroxypropyl acrylamide, has low process cost, uses lead nitrate as an antimony activator, butyl ammonium as an antimony collector and pine oil as a foaming agent, and under the combined action of the above flotation reagents, the antimony minerals in the slurry can be floated more easily into the tailings in the gravity separation process, and the arsenic minerals can be inhibited more easily into the gravity separation concentrate in the gravity separation process. The addition of flotation reagents in the gravity separation operation and the return of middlings to the gravity separation slurry for gravity separation again can further reduce the arsenic content in the antimony concentrate. That is, the arsenic in the antimony concentrate is removed by gravity separation, and the antimony collector, the antimony activator and the arsenic inhibitor are added in the system. The process equipment is simple, and the separation precision of antimony and arsenic is effectively improved.

[0045] In addition, compared with the traditional antimony-arsenic separation process, the present application does not use highly toxic reagents such as cyanide, is environmentally friendly and pollution-free, and can achieve green and efficient separation of antimony and arsenic.

[0046] Preferably, in step S1, the grinding fineness of the antimony concentrate is 60-140 mesh.

[0047] The grinding fineness can be 60 mesh, 70 mesh, 80 mesh, or 140 mesh.

[0048] In this embodiment, the grinding fineness of the antimony concentrate is controlled to be between 60 mesh and 140 mesh. This is because the stibnite and arsenopyrite are often associated with each other and can be separated into independent monomers from the intergrowth state at a suitable grinding fineness, which creates conditions for subsequent separation. Specifically, when the grinding fineness of the antimony concentrate is between 60 mesh and 140 mesh, the flotation reagent can selectively adsorb on the surface of the antimony concentrate, improving the selectivity of the flotation reagent in the gravity separation process. In the gravity separation process, when the grinding fineness of the antimony concentrate is between 60 mesh and 140 mesh, the antimony and arsenic minerals can be better separated according to the density difference. The grinding fineness is uniform, the mineral particle size is consistent, the density layering in the gravity separation equipment is clearer, and the separation effect is better. If the grinding is too coarse, part of the antimony and arsenic minerals are intergrown, which is difficult to separate subsequently, affecting the purity of the antimony concentrate. If the grinding is too fine, over-grinding occurs, increasing energy consumption and cost, and the surface properties of the minerals may change, which is not conducive to separation. It should be noted that if the grinding fineness of the minerals is suitable, the grinding step can be skipped.

[0049] Preferably, in step S2, the addition amount of the dextrin is 100-1000 g / t per ton of ore.

[0050] The addition amount of the dextrin can be 100 g / t, 200 g / t, 300 g / t, or 1000 g / t.

[0051] In this embodiment, the addition amount of the dextrin is preferably 100-1000 g / t. In the pulp environment, the active functional groups such as hydroxyl groups in the dextrin molecules can interact with specific active sites on the surface of arsenic minerals, thereby selectively adsorbing on the surface of arsenic minerals, hindering the combination of arsenic minerals with collectors, and reducing their floatability, making the arsenic minerals hydrophilic, while the antimony minerals float into the gravity separation light product part in the gravity separation process, achieving separation. When arsenic exists in the form of arsenopyrite, the dextrin forms a hydrophilic film on the surface of arsenopyrite, inhibiting its floating in the gravity separation process, and thus making it more easily enter the gravity product part, improving the purity of the antimony concentrate. When the addition amount of the dextrin is controlled to be 100-1000 g / t, the separation effect is improved by facilitating the adhesion and floating of the antimony minerals, while preventing the arsenic minerals from floating with the foam. However, if the addition amount of the dextrin is greater than 1000 g / t, the subsequent treatment difficulty will increase.

[0052] In addition, compared with the reagents in the traditional antimony-arsenic separation process, the dextrin used as an arsenic inhibitor in the present application can effectively reduce the experimental cost.

[0053] Preferably, in step S2, the hydroxyl polyacrylamide is added in an amount of 100-1000 g / t of ore.

[0054] The amount of hydroxyl polyacrylamide added can be specifically 100 g / t, 200 g / t, 300 g / t, …, 1000 g / t.

[0055] In this embodiment, the amount of hydroxyl polyacrylamide added is preferably 100-1000 g / t. The hydroxyl polyacrylamide has active functional groups such as hydroxyl groups in its molecular structure, which can interact with specific active sites on the surface of arsenic minerals (such as arsenopyrite, etc.) in the ore slurry environment. For arsenopyrite (FeAsS), there are electron cloud distributions around the iron, sulfur, arsenic, etc. atoms on its surface that can be chemically bonded. The hydroxyl polyacrylamide molecules can combine with them through hydrogen bonds, coordination bonds, or van der Waals forces, etc., thereby achieving adsorption on the surface of arsenic minerals. It forms a hydrophilic film on the surface of arsenic minerals, which can prevent the collector from effectively contacting the surface of arsenic minerals. In the process of gravity separation, the role of the collector is to make the antimony minerals hydrophobic, so that they adhere to the gas bubbles and more easily float into the light product. The inhibitory effect of hydroxyl polyacrylamide on arsenic minerals makes it difficult for arsenic minerals to combine with the collector, reducing the hydrophobicity of arsenic minerals, so that they remain in the ore slurry, while antimony minerals can interact with the collector and float into the light product, thereby achieving separation of antimony and arsenic.

[0056] In addition to antimony minerals and arsenic minerals, there may be other associated minerals in the antimony concentrate. Hydroxyl polyacrylamide can enhance the difference in hydrophobic behavior between antimony minerals and arsenic minerals and other associated minerals. It has a strong inhibitory effect on arsenic minerals, while its effect on antimony minerals is relatively small, thereby improving the selectivity of antimony-arsenic separation in the process of gravity separation. This helps to reduce the content of arsenic in the antimony concentrate and improve the quality and purity of the antimony concentrate.

[0057] In addition, hydroxyl polyacrylamide can adjust the viscosity and fluidity of the ore slurry. Hydroxyl polyacrylamide can make the ore slurry have suitable viscosity and fluidity, ensuring uniform distribution of mineral particles in the ore slurry, which is conducive to the collision and adhesion of gas bubbles and mineral particles, thereby improving the effect of antimony-arsenic separation.

[0058] Preferably, in step S2, the lead nitrate is added in an amount of 200-1000 g / t of ore.

[0059] The amount of lead nitrate added can be specifically 200 g / t, 300 g / t, 400 g / t, …, 1000 g / t.

[0060] In this embodiment, lead nitrate as an activator will dissociate lead ions Pb 2+The lead ions can be adsorbed on the surface of antimony minerals, when the adding amount of lead nitrate is 200-1000g / t, the antimony minerals activated by lead nitrate can be preferentially floated and enter the light product, while the arsenic minerals remain in the slurry, so that effective separation is achieved.

[0061] Preferably, in step S2, the adding amount of the butyl ammonium is 10-100g / t per ton of ore.

[0062] Preferably, the adding amount of the butyl ammonium is 10-100g / t per ton of ore.

[0063] In this embodiment, the butyl ammonium generally refers to butyl ammonium black, the chemical name of which is dibutyl dithiophosphate, which is a commonly used sulfide ore flotation collector. It has strong selective collecting effect on antimony minerals, but relatively poor collecting effect on arsenic minerals. In the gravity separation process of antimony concentrate, controlling the adding amount of butyl ammonium between 10-100g / t can make antimony minerals preferentially enriched and float into light products, while arsenic minerals remain in the slurry, thereby improving the efficiency and precision of antimony-arsenic separation.

[0064] Preferably, the adding amount of the pine oil is 10-100g / t.

[0065] Preferably, the adding amount of the pine oil is 10-100g / t.

[0066] In this embodiment, by controlling the adding amount of pine oil between 10-100g / t, the stable foam produced by pine oil makes antimony minerals preferentially adhere to bubbles and float into gravity separation light products, while arsenic minerals remain in the slurry and easily enter gravity separation heavy products, thereby improving the effect of antimony-arsenic separation.

[0067] Preferably, in step S2, the pH of the slurry process is 5.5-7.5.

[0068] Preferably, the pH is 5.5, 6.0, 6.5,..., 7.5.

[0069] In this embodiment, by controlling the pH of the slurry to be weakly acidic to neutral, i.e. 5.5-7.5, the properties of the slurry are more stable, and the quality of the foam is also better. Stable slurry and high-quality foam help to reduce the entrainment of gangue minerals and arsenic minerals and other impurities in the gravity separation process. In the gravity separation process, only the antimony minerals with hydrophobic surface can effectively adhere to the bubbles and float to the foam layer and then enter the gravity separation light product, while the arsenic minerals and other impurities, due to the unfavorable surface properties, cannot adhere to the bubbles and enter the gravity separation heavy product, and thus remain in the slurry, thereby improving the purity of the antimony concentrate.

[0070] Preferably, in step S3, the reselection is performed using a spiral chute or a shaking table.

[0071] The specific steps of using a spiral chute are as follows:

[0072] S31 Feeding: The antimony concentrate slurry is uniformly fed into the upper end of the spiral chute. The slurry flows downward along the spiral chute under the action of gravity, and at the same time, the mineral particles in the slurry are subjected to centrifugal force due to the rotation of the spiral chute.

[0073] S32 Layering: During the flow in the spiral chute, the arsenic mineral particles with a larger density and the antimony mineral particles with a smaller density are stratified under the combined action of gravity, centrifugal force, water flow impact force, and friction force on the chute bottom. The arsenic mineral particles with a larger density tend to be close to the inner edge of the spiral chute and gradually deposit, while the antimony mineral particles with a smaller density are relatively concentrated on the outer edge of the slurry flow and remain in a relatively suspended state.

[0074] S33 Zoning: As the slurry continuously flows downward, the stratified mineral particles gradually form different zones. On the transverse cross-section of the spiral chute, from the inner edge to the outer edge, there are the arsenic mineral enrichment zone with a larger density and the antimony mineral enrichment zone with a smaller density.

[0075] S34 Interception: At the lower end of the spiral chute, according to the zoning of the minerals, an interceptor is used to intercept and collect the slurry of different zones, thereby achieving the preliminary separation of antimony and arsenic.

[0076] The shaking table separates antimony and arsenic based on inclined water flow, as follows:

[0077] On the shaking table surface, under the combined action of transverse water flow and bed surface longitudinal differential reciprocating motion, mineral particles of different densities and particle sizes produce different motion trajectories. The arsenic mineral particles with a larger density move slowly in the longitudinal direction of the bed surface and are less affected by the transverse water flow, gradually enriching near the concentrate end of the bed surface; while the antimony mineral particles with a smaller density move relatively faster in the longitudinal direction and move more towards the tailings end under the action of transverse water flow, thereby achieving the separation of antimony and arsenic.

[0078] Preferably, in step S2, the time for slurry preparation is 3-10 minutes, and in step S3, the number of reselections is 1-5 times.

[0079] Specifically, the time for slurry preparation can be 3 minutes, 4 minutes, 5 minutes,..., 10 minutes, preferably 4-6 minutes, and the number of reselections can be 1 time, 2 times, 3 times,..., 5 times, preferably 2-3 times.

[0080] In the embodiment, if the mixing and stirring time is too short, i.e., less than 3 minutes, the collector has not enough time to fully contact and react with the antimony minerals. Part of the antimony minerals cannot be effectively collected, resulting in a decrease in the recovery rate of antimony, and a large amount of antimony minerals remain in the ore slurry and are discharged as tailings together with arsenic minerals, causing resource waste. If the mixing and stirring time is too long, i.e., more than 10 minutes, the collector can be excessively adsorbed on the surface of the antimony minerals, making the hydrophobicity of the surface of the antimony minerals too strong, resulting in some impurity minerals that should not float also adhering to the antimony minerals and entering the gravity separation light product, thereby reducing the grade of the antimony concentrate. At the same time, the long mixing and stirring time can also cause the antimony minerals that have adhered to the bubbles to fall off and return to the ore slurry, affecting the separation efficiency.

[0081] In the embodiment, the antimony minerals and the arsenic minerals are often difficult to be completely separated by one-time gravity separation, and therefore the number of times of gravity separation is increased to gradually enrich the antimony minerals in each gravity separation process. Through multiple gravity separations, the impurity minerals can be further separated in subsequent gravity separation processes, the grade of the antimony concentrate is gradually improved, the content of arsenic in the antimony concentrate is reduced, and more accurate separation is achieved. However, if the number of times of gravity separation is too large, i.e., more than 5 times, the loss of the minerals in the multiple transfer and processing processes will increase, and the energy consumption in the operation of the equipment will also increase, resulting in an increase in the production cost.

[0082] In order for those skilled in the art to better understand the present application, the technical solutions of the present application are further described below through several specific embodiments.

[0083] Embodiment 1

[0084] A certain arsenic-containing antimony concentrate is used as a raw material, and the mineral types mainly include stibnite (Sb2S3), arsenopyrite (FeAsS), pyrite (FeS2), followed by quartz (SiO2), carbonate (CO3 2- ), feldspar minerals (potassium feldspar, sodium feldspar), wherein the arsenic-containing antimony concentrate contains 25.07% of antimony and 1.29% of arsenic.

[0085] Figure 2 The process flow diagram for reducing the content of arsenic in the antimony concentrate provided by the embodiment 1 of the present application is shown in FIG. 1. Figure 2 As shown in FIG. 1, first, the arsenic-containing antimony concentrate (containing 25.07% of antimony and 1.29% of arsenic) is ground, and then the arsenic-containing antimony concentrate after grinding is screened with a 60-mesh screen, and the arsenic-containing antimony concentrate with a screening fineness of less than 60 mesh (i.e., the antimony concentrate with a fineness of 250 microns) is obtained. Water is added to the arsenic-containing antimony concentrate after screening to form an ore slurry.

[0086] The arsenic inhibitor dextrin 100 g / t and hydroxyl polyacrylamide 1000 g / t, the antimony activator lead nitrate 200 g / t, the antimony collector butyl ammonium 10 g / t and the frother pine oil 10 g / t are added into the ore pulp with a stirring rate of 150 r / min to carry out slurry conditioning, so that a gravity separation slurry is obtained, the pH value of the gravity separation slurry is controlled to be 6, and the slurry conditioning stirring time is 5 minutes;

[0087] The gravity separation slurry is subjected to gravity separation by using a shaking table, and the gravity separation is carried out for 3 times, so that an antimony concentrate, an arsenic-containing product and a middling are obtained.

[0088] The middling is returned to the gravity separation slurry, and the gravity separation operation is repeated until the antimony concentrate and the arsenic-containing product are completely separated.

[0089] Comparative Example 1

[0090] A certain arsenic-containing antimony concentrate is used as a raw material, and the mineral types and contents are the same as those in Example 1.

[0091] Figure 3 A process flow diagram for reducing the arsenic content in the antimony concentrate provided by Comparative Example 1 of the present application is shown in FIG. 1. Figure 3 As shown in FIG. 1, after the arsenic-containing antimony concentrate in Comparative Example 1 is ground, only the shaking table is used for separation, that is, the single gravity separation is used to separate the antimony and arsenic in Comparative Example 1, so that the antimony concentrate, the arsenic-containing product and the middling are obtained.

[0092] Comparative Example 2

[0093] A certain arsenic-containing antimony concentrate is used as a raw material, and the mineral types and contents are the same as those in Example 1.

[0094] Figure 4 A process flow diagram for reducing the arsenic content in the antimony concentrate provided by Comparative Example 2 of the present application is shown in FIG. 2. Figure 4 As shown in FIG. 2, after the arsenic-containing antimony concentrate in Comparative Example 2 is ground, only the addition of the flotation reagents is used for separation, and the types and amounts of the flotation reagents are the same as those in Example 1, that is, the single flotation is used to separate the antimony and arsenic in Comparative Example 2, so that the antimony concentrate and the arsenic-containing product are obtained.

[0095] Table 1 shows a comparison table of the indexes of the processes of Example 1 and Comparative Examples 1 and 2, as shown in Table 1, the results show that, by using the separation process of Example 1, the yield of the antimony concentrate is 64.87%, the antimony grade is 34.95%, the arsenic grade is 0.62%, the recovery rate of the antimony is 90.40%, and the recovery rate of the arsenic is 31.48%. Before the separation of the antimony and arsenic, the arsenic-antimony ratio in the antimony concentrate is 5.15%, which is greater than 2%, and after the separation process of Example 1, the arsenic-antimony ratio in the antimony concentrate is 1.77%, which is less than 2%. By using the separation process of Comparative Example 1, the arsenic-antimony ratio in the antimony concentrate is 2.33%, which is greater than 2%; by using the separation process of Comparative Example 2, the arsenic-antimony ratio in the antimony concentrate is 2.20%, which is greater than 2%.

[0096] When the arsenic-antimony ratio is less than 2%, it indicates that the content of arsenic is at a low level, and the quality of the antimony concentrate can better meet the industry requirements; the interference of arsenic on the performance of antimony is significantly reduced, thereby improving the purity and quality of the antimony concentrate, and making it more suitable for use in fields with higher purity requirements, such as the electronics and semiconductor industries.

[0097] The process for reducing the content of arsenic in the antimony concentrate provided in this embodiment 1 can inhibit arsenic in the ore slurry by adding dextrin and hydroxypropyl acrylamide, and can make the antimony in the ore slurry float into the gravity separation light product under the combined action of lead nitrate as an antimony activator, butyl ammonium as an antimony collector, and pine oil as a frother. The arsenic content in the antimony concentrate is further reduced by adding the flotation reagents to the gravity separation operation and returning the middlings to the gravity separation slurry for gravity separation again. That is, arsenic in the antimony concentrate is removed by gravity separation, and an antimony collector, an antimony activator, and an arsenic inhibitor are added to the system. The arsenic-antimony ratio is less than 2%, the process equipment is simple, and the separation precision of antimony and arsenic is effectively improved.

[0098] Table 1 shows a comparison of the indicators of the process of embodiment 1 with the processes of comparative examples 1 and 2.

[0099]

[0100] Embodiment 2

[0101] Embodiment 2 uses the same process flow as embodiment 1 for antimony-arsenic separation, and the only difference is that dextrin 500 g / t and hydroxypropyl acrylamide 500 g / t, antimony activator lead nitrate 600 g / t, antimony collector butyl ammonium 60 g / t, and frother pine oil 50 g / t are used for slurry preparation, and the slurry is obtained by gravity separation. The slurry preparation stirring time is 4 minutes.

[0102] Comparative Example 3

[0103] The arsenic-antimony concentrate in comparative example 3 is separated only by adding flotation reagents after grinding, and the types and amounts of the flotation reagents are the same as those of embodiment 2, i.e., comparative example 3 uses single flotation to separate antimony and arsenic, and obtains an antimony concentrate and an arsenic-containing product.

[0104] Table 2 shows a comparison of the indicators of the process of embodiment 2 with the processes of comparative examples 1 and 3. As shown in Table 2, the results show that before the separation of antimony and arsenic, the arsenic-antimony ratio in the antimony concentrate is 5.15%, and after the separation process of embodiment 2, the arsenic-antimony ratio in the antimony concentrate is 1.74%, which is less than 2%. The arsenic-antimony ratio in the antimony concentrate is 2.33% when the separation process of comparative example 1 is used, which is greater than 2%; and the arsenic-antimony ratio in the antimony concentrate is 2.23% when the separation process of comparative example 3 is used, which is also greater than 2%.

[0105] The process for reducing the arsenic content in antimony concentrate provided in this embodiment 2 adopts the way of adding flotation reagents in gravity separation operation, i.e. removing arsenic in antimony concentrate by gravity separation, adding antimony collector, antimony activator and arsenic depressant in the system to make the arsenic-antimony ratio less than 2%, which effectively improves the separation precision of antimony and arsenic.

[0106] Table 2 shows the index comparison table of the process of embodiment 2 and the processes of comparative examples 1 and 3.

[0107]

[0108] Embodiment 3

[0109] Embodiment 3 adopts the same process flow as embodiment 1 for separating antimony and arsenic, the only difference is that 1000 g / t of dextrin and 100 g / t of hydroxy polyacrylamide, 1000 g / t of antimony activator lead nitrate, 100 g / t of antimony collector butyl ammonium and 100 g / t of foaming agent pine oil are used for slurry preparation, and the stirring time for slurry preparation is 4 minutes.

[0110] Comparative Example 4

[0111] In comparative example 4, the arsenic-antimony concentrate is separated only by adding flotation reagents after grinding, and the types and amounts of flotation reagents are the same as those in embodiment 3, i.e. comparative example 4 adopts single flotation to separate antimony and arsenic, and obtains antimony concentrate and arsenic-containing product.

[0112] Table 3 shows the index comparison table of the process of embodiment 3 and the processes of comparative examples 1 and 4. As shown in Table 3, the results show that the arsenic-antimony ratio in the antimony concentrate before separation is 5.15%, the arsenic-antimony ratio in the antimony concentrate after the separation process of embodiment 3 is 1.74%, which is less than 2%. The arsenic-antimony ratio in the antimony concentrate after the separation process of comparative example 1 is 2.33%, which is greater than 2%. The arsenic-antimony ratio in the antimony concentrate after the separation process of comparative example 4 is 2.23%, which is greater than 2%.

[0113] The process for reducing the arsenic content in antimony concentrate provided in this embodiment 3 adopts the way of adding flotation reagents in gravity separation operation, i.e. removing arsenic in antimony concentrate by gravity separation, adding antimony collector, antimony activator and arsenic depressant in the system to make the arsenic-antimony ratio less than 2%, which effectively improves the separation precision of antimony and arsenic.

[0114] Table 3 shows the index comparison table of the process of embodiment 3 and the processes of comparative examples 1 and 4. As shown in Table 3, the results show that the arsenic-antimony ratio in the antimony concentrate before separation is 5.15%, the arsenic-antimony ratio in the antimony concentrate after the separation process of embodiment 3 is 1.74%, which is less than 2%. The arsenic-antimony ratio in the antimony concentrate after the separation process of comparative example 1 is 2.33%, which is greater than 2%. The arsenic-antimony ratio in the antimony concentrate after the separation process of comparative example 4 is 2.23%, which is greater than 2%.

[0115]

[0116] Compared with the separation process of single flotation or single gravity separation, the overall separation process of the embodiment of the present application can make the arsenic-antimony ratio in the antimony concentrate less than 2%, that is, the process equipment is simple by adding a flotation reagent in the gravity separation operation, the content of arsenic in the antimony concentrate is effectively reduced, and the separation precision of antimony and arsenic is improved.

[0117] In addition, the present application does not use toxic reagents such as cyanide, is environmentally friendly and non-polluting, and can realize green and efficient separation of antimony and arsenic.

[0118] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0119] For the method embodiments, for the sake of simple description, they are all expressed as a combination of a series of actions, but those skilled in the art should know that the present application is not limited by the order of the described actions, because according to the present application, certain steps can be performed in other order or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and components involved are not necessarily necessary for the present application.

[0120] The above describes in detail the process for reducing the arsenic content in the antimony concentrate provided by the present application, and the principles and implementation modes of the present application are described by applying specific examples. The above embodiment description is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed; in view of the above, the content of the present specification should not be understood as a limitation of the present application.

Claims

1. A process for reducing the arsenic content of antimony concentrates, characterized in that, The process comprises the following steps: S1, grinding the antimony concentrate containing arsenic to form a slurry; S2, adding appropriate amounts of arsenic depressant dextrin and hydroxypropyl acrylamide, antimony activator lead nitrate, antimony collector butyl ammonium and foaming agent pinol oil to the slurry to adjust the pulp, obtaining gravity separation slurry; S3, gravity separation of the gravity separation slurry to obtain antimony concentrate, arsenic-containing product and middlings; S4, returning the middlings to step S2 and repeating steps S2-S3; The addition amount of dextrin is 10-1200 g / t of ore; the addition amount of hydroxypropyl acrylamide is 50-1400 g / t; the addition amount of lead nitrate is 100-1200 g / t; the addition amount of butyl ammonium is 5-150 g / t; the addition amount of pinol oil is 5-130 g / t.

2. The process according to claim 1, characterized in that, In step S1, the fineness of the antimony concentrate after grinding is 60-140 mesh.

3. The process of claim 1, wherein, In step S2, the addition amount of dextrin is 100-1000 g / t of ore.

4. The process of claim 1, wherein, In step S2, the addition amount of hydroxypropyl acrylamide is 100-1000 g / t of ore.

5. The process of claim 1, wherein, In step S2, the addition amount of lead nitrate is 200-1000 g / t of ore.

6. The process of claim 1, wherein, In step S2, the addition amount of butyl ammonium is 10-100 g / t of ore.

7. The process of claim 1, wherein, In step S2, the addition amount of pinol oil is 10-100 g / t of ore.

8. The process of claim 1, wherein, In step S2, the pH of the pulp adjustment process is 5.5-7.

5.

9. The process of claim 1, wherein, In step S3, the gravity separation is carried out by spiral chute or shaking table.

10. The process of claim 1, wherein, In step S2, the pulp adjustment time is 3-10 minutes, and in step S3, the gravity separation is carried out 1-5 times.

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