Process for reducing arsenic content in antimony concentrate

Abstract

According to the technology for reducing the arsenic content in the antimony concentrate, dextrin and hydroxyl polyacrylamide are added in the reselection pulp mixing process to inhibit arsenic in ore pulp, lead nitrate is added to serve as an antimony activating agent, ammonium butyrate serves as an antimony collecting agent, and terpenic oil serves as a foaming agent; under the combined action of the flotation reagents, antimony in the gravity concentration ore pulp can float upwards, arsenic minerals are further inhibited, and arsenic in antimony concentrate can be better removed through gravity concentration. Test results show that compared with a process singly adopting flotation or reselection, the method adopting the reselection operation to add the flotation reagent can effectively reduce the content of arsenic in the antimony concentrate, process equipment is simple, and indexes are stable. In addition, cyanide and other reagents with high toxicity are not adopted in the process, environmental protection and no pollution are achieved, and green and efficient separation of antimony and arsenic can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of resource environment, and in particular to a process for reducing the arsenic content in antimony concentrate. Background Art

[0002] Antimony concentrate is the main raw material for antimony smelting. In antimony sulfide deposits, it is often accompanied by sulfide minerals such as arsenopyrite and pyrite. Since stibnite and arsenopyrite have similar floatability, the arsenic content in antimony concentrate products exceeds the standard. The presence of arsenic not only reduces the purity of antimony, but also affects the quality of antimony products, sales channels and prices, and brings serious environmental problems to the subsequent smelting process.

[0003] In the antimony and arsenic separation process of related technology, a high alkalinity, cyanide, and strong oxidizing agent system is often used. However, there are problems such as high alkalinity is not conducive to gold recovery, cyanide is highly toxic, strong oxidants have little difference in oxidation of antimony and arsenic, and separation accuracy is low, making it impossible to achieve green and efficient antimony and arsenic separation.

[0004] Therefore, the related technology has the following technical problems: the traditional antimony-arsenic separation process cannot effectively achieve the deep separation of arsenic and antimony, resulting in poor effect of reducing the arsenic content in the antimony concentrate and low separation accuracy. Summary of the invention

[0005] In view of the above problems existing in the related art, the present invention provides a process for reducing the arsenic content in antimony concentrate, by adding dextrin and hydroxy polyacrylamide to the slurry to inhibit arsenic, using lead nitrate as an antimony activator, butyl ammonium as an antimony collector and pine oil as a foaming agent to adjust the slurry, and performing gravity separation after the slurry adjustment. During the gravity separation process, the antimony minerals float up and are more conducive to entering the gravity separation tailings, and the arsenic minerals are suppressed and are more conducive to entering the gravity separation concentrate. The flotation agent is added in the gravity separation process to enhance the gravity separation effect, so as to reduce the arsenic content in the antimony concentrate.

[0006] The specific content of the invention is as follows:

[0007] The present invention provides a process for reducing the arsenic content in antimony concentrate, the process comprising the following steps:

[0008] S1. Grinding the arsenic-containing antimony concentrate to form a slurry;

[0009] S2, adding appropriate amounts of arsenic inhibitor dextrin and hydroxy polyacrylamide, antimony activator lead nitrate, antimony collector butyl ammonium and foaming agent pine oil to the ore pulp for slurry adjustment to obtain gravity separation slurry;

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

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

[0012] Calculated per ton of ore, the added amount of dextrin is 10-1200 g / t; the added amount of hydroxy polyacrylamide is 50-1400 g / t; the added amount of lead nitrate is 100-1200 g / t; the added amount of butyl ammonium is 5-150 g / t; and the added amount of pine oil is 5-130 g / t.

[0013] Optionally, in step S1, the antimony concentrate is ground to a fineness of 60 mesh to 140 mesh.

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

[0015] Optionally, in step S2, the amount of hydroxy polyacrylamide added is 100-1000 g / t per ton of ore.

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

[0017] Optionally, in step S2, the amount of butylammonium added is 10-100 g / t per ton of ore.

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

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

[0020] Optionally, in step S3, the gravity selection is carried out using a spiral chute or a shaking table.

[0021] Optionally, in step S2, the slurry adjustment time is 3 to 10 minutes, and in step S3, the number of reselection is 1 to 5 times.

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

[0023] The invention provides a process for reducing the arsenic content in antimony concentrate, comprising grinding the arsenic-containing antimony concentrate to form a pulp; then adding appropriate amounts of arsenic inhibitor dextrin and hydroxy polyacrylamide, antimony activator lead nitrate, antimony collector butyl ammonium and foaming agent pine oil into the pulp for slurry adjustment to obtain a gravity separation slurry; gravity separation the gravity separation slurry to obtain an antimony concentrate, an arsenic-containing product and a middling; returning the middling to the slurry adjustment process, and repeating the gravity separation operation.

[0024] The process for reducing the arsenic content in antimony concentrate provided by the present invention comprises the following steps: grinding the arsenic-containing antimony concentrate to form a pulp, and adding dextrin and hydroxy polyacrylamide to inhibit the arsenic in the pulp. The process cost is low, lead nitrate is used as an antimony activator, butyl ammonium is used as an antimony collector, and pine oil is used as a frother. Under the joint action of the above flotation reagents, the antimony in the pulp can be easily floated and enter the gravity separation tailings, and the arsenic minerals can be easily suppressed and enter the gravity separation concentrate during the gravity separation process. The flotation reagent is added in the gravity separation operation, and the middling ore is returned to the gravity separation pulp for gravity separation again to 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, antimony activator and arsenic inhibitor are added in the system. The process equipment is simple, the indicators are stable, and the separation accuracy of antimony and arsenic is effectively improved.

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

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 The process flow chart for reducing the arsenic content in antimony concentrate provided by an embodiment of the present invention is shown.

[0028] Figure 2 The process flow chart for reducing the arsenic content in antimony concentrate provided in Example 1 of the present invention is shown.

[0029] Figure 3 The process flow chart for reducing the arsenic content in antimony concentrate provided in Comparative Example 1 is shown.

[0030] Figure 4 The process flow chart for reducing the arsenic content in antimony concentrate provided in Comparative Example 2 is shown. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the present invention and its application or use. Based on the embodiments of the present invention, any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts falls within the scope of protection of the present invention. In addition, all other embodiments obtained by ordinary technicians in this field without carrying out creative work belong to the scope of protection of the present invention.

[0032] In the embodiment, no specific experimental steps or conditions are indicated, and the operation or conditions of the conventional experimental steps described in the prior art in this field can be carried out. The reagents used and other instruments that do not indicate the manufacturer are conventional reagent products that can be obtained commercially. In addition, the accompanying drawings are only schematic diagrams of the embodiments of the present invention and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted. Some block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the description of the present invention.

[0034] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] China is the country with the richest antimony resources in the world, with the largest reserves and production in the world. Hunan is the largest antimony producing area in China, and the tin mine in Lengshuijiang City is known as the "World Antimony Capital". In addition, there are also a large number of antimony mines in Guangxi, Guizhou, Yunnan, Gansu and other places. Antimony mines in these areas are often accompanied by arsenic and other elements, which increases the complexity of antimony and arsenic separation.

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

[0037] In the current antimony and arsenic separation process, a high alkalinity, cyanide, and strong oxidizing agent system is often used. However, there are problems such as high alkalinity is not conducive to gold recovery, cyanide is highly toxic, the strong oxidant has a small difference in the oxidation of antimony and arsenic, and the separation accuracy is low, making it impossible to achieve green and efficient antimony and arsenic separation.

[0038] In view of this, the present invention provides a process for reducing the arsenic content in antimony concentrate. Figure 1 The process flow chart of reducing the arsenic content in antimony concentrate provided by the embodiment of the present invention is shown as follows: Figure 1 As shown, the process comprises the following steps:

[0039] S1. Grinding the arsenic-containing antimony concentrate to form a slurry;

[0040] S2, adding appropriate amounts of arsenic inhibitor dextrin and hydroxy polyacrylamide, antimony activator lead nitrate, antimony collector butyl ammonium and foaming agent pine oil to the ore pulp for slurry adjustment to obtain gravity separation slurry;

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

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

[0043] Calculated per ton of ore, the added amount of dextrin is 10-1200 g / t; the added amount of hydroxy polyacrylamide is 50-1400 g / t; the added amount of lead nitrate is 100-1200 g / t; the added amount of butyl ammonium is 5-150 g / t; and the added amount of pine oil is 5-130 g / t.

[0044] The process for reducing the arsenic content in antimony concentrate provided by the present invention comprises the following steps: grinding the arsenic-containing antimony concentrate to form a pulp, and adding dextrin and hydroxy polyacrylamide to inhibit the arsenic in the pulp. The process cost is low, and lead nitrate is used as an antimony activator, butyl ammonium is used as an antimony collector, and pine oil is used as a frother. Under the joint action of the above flotation reagents, the antimony minerals in the pulp can be floated during the re-selection process to more easily enter the tailings, and the arsenic minerals can be suppressed during the re-selection process to more easily enter the re-selection concentrate. The flotation reagent is added during the re-selection operation, and the middlings are returned to the re-selection pulp for re-selection to further reduce the arsenic content in the antimony concentrate. That is, the arsenic in the antimony concentrate is removed by re-selection, and the antimony collector, the antimony activator and the arsenic inhibitor are added in the system. The process equipment is simple, and the separation accuracy of antimony and arsenic is effectively improved.

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

[0046] Preferably, in step S1, the antimony concentrate is ground to a fineness of 60 mesh to 140 mesh.

[0047] Among them, the grinding fineness can be specifically 60 mesh, 70 mesh, 80 mesh...140 mesh.

[0048] In this embodiment, the fineness of the antimony concentrate grinding is controlled between 60 mesh and 140 mesh. This is because stibnite and arsenopyrite often coexist and coexist. When the grinding fineness is appropriate, they can be separated from the intergrowth state into independent monomers, creating conditions for subsequent separation. Specifically, when the fineness of the antimony concentrate is between 60 mesh and 140 mesh, the flotation agent can be selectively adsorbed on the surface of the antimony concentrate, thereby improving the selectivity of the flotation agent adsorption in the gravity separation process. In the gravity separation process, when the fineness of the antimony concentrate is between 60 mesh and 140 mesh, antimony and arsenic minerals can be better separated according to density differences. The grinding fineness is uniform, the mineral particle size is consistent, the density stratification in the gravity separation equipment is clearer, and the separation effect is better. If the grinding is too coarse, some antimony and arsenic minerals will coexist and it will be difficult to separate them later, affecting the purity of the antimony concentrate; if the grinding is too fine, over-crushing will occur, increasing energy consumption and cost, and may also cause changes in the surface properties of the minerals, which is not conducive to sorting. It should be noted that if the fineness of the mineral is appropriate, the grinding step can be skipped.

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

[0050] The added amount of dextrin may specifically be 100 g / t, 200 g / t, 300 g / t...1000 g / t.

[0051] In this embodiment, the amount of dextrin added is preferably 100-1000g / t. In the slurry environment, the active functional groups such as hydroxyl groups in the dextrin molecules can interact with the specific active sites on the surface of the arsenic mineral, thereby selectively adsorbing on the surface of the arsenic mineral, hindering the arsenic mineral from combining with the collector, reducing its floatability, making the arsenic mineral highly hydrophilic, and the antimony mineral floats into the light product part of the re-selection process to achieve separation. When arsenic exists in the form of arsenopyrite, dextrin forms a hydrophilic film on the surface of the arsenopyrite, inhibiting its floating during the re-selection process, and then making it easier to enter the heavy product part, thereby improving the purity of the antimony concentrate. When the amount of dextrin added is controlled to be 100-1000g / t, it is conducive to the attachment and floating of antimony minerals, while preventing arsenic minerals from floating with foam, thereby improving the separation effect. However, the amount of dextrin added greater than 1000g / t will increase the difficulty of subsequent processing.

[0052] In addition, compared with the reagents in the traditional antimony and arsenic separation process, the present invention uses dextrin as an arsenic inhibitor, which can effectively reduce the experimental cost.

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

[0054] The addition amount of hydroxy polyacrylamide can be specifically 100 g / t, 200 g / t, 300 g / t...1000 g / t.

[0055] In this embodiment, the addition amount of hydroxy polyacrylamide is preferably 100-1000g / t. The molecular structure of hydroxy polyacrylamide contains active functional groups such as hydroxyl groups. In the slurry environment, these functional groups can interact with specific active sites on the surface of arsenic minerals (such as arsenopyrite, etc.). For arsenopyrite (FeAsS), there is an electron cloud distribution around the iron, sulfur, arsenic and other atoms on its surface that can be used for chemical bonding. The hydroxy polyacrylamide molecules can be combined with it through hydrogen bonds, coordination bonds or van der Waals forces, thereby achieving adsorption on the surface of arsenic minerals. It forms a hydrophilic film on the surface of the arsenic mineral, which can prevent the effective contact between the collector and the surface of the arsenic mineral. In the process of re-selection, the role of the collector is to make the surface of the antimony mineral hydrophobic, so that it is easier to float and enter the light product during the re-selection process by attaching to the bubbles. The inhibitory effect of hydroxy polyacrylamide on arsenic minerals makes it difficult for arsenic minerals to combine with the collector, reducing the hydrophobicity of the arsenic minerals, so that they remain in the slurry, while the antimony minerals can react with the collector and float into the light product, thereby achieving antimony arsenic separation.

[0056] In antimony concentrate, in addition to antimony minerals and arsenic minerals, other associated minerals may also exist. Hydroxypolyacrylamide 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 the effect on antimony minerals is relatively small, thereby improving the selectivity of antimony-arsenic separation during gravity separation. This helps to reduce the arsenic content in antimony concentrate and improve the quality and purity of antimony concentrate.

[0057] In addition, hydroxy polyacrylamide can adjust the viscosity and fluidity of the slurry. Hydroxy polyacrylamide can make the slurry have appropriate viscosity and fluidity, ensure that the mineral particles are evenly distributed in the slurry, and facilitate the collision and adhesion of bubbles and mineral particles, thereby improving the effect of antimony and arsenic separation.

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

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

[0060] In this embodiment, lead nitrate is used as an activator to dissociate lead ions Pb in the slurry. 2+These lead ions can be adsorbed on the surface of antimony minerals. When the addition amount of lead nitrate is 200-1000g / t, the antimony minerals activated by lead nitrate can float preferentially and enter the light product more easily, while the arsenic minerals remain in the slurry, thus achieving effective separation.

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

[0062] The specific addition amount of butylammonium may be 10 g / t, 20 g / t, 30 g / t...100 g / t.

[0063] In this embodiment, butylammonium generally refers to butylammonium black medicine, the chemical name of which is dibutyl ammonium dithiophosphate, which is a commonly used sulfide ore flotation collector, and has a strong selective capture effect on antimony minerals, while the capture effect on arsenic minerals is relatively poor. In the re-selection process of antimony concentrate, the addition amount of butylammonium is controlled to be between 10-100g / t, so that the antimony minerals can be preferentially enriched to float into light products, while most of the arsenic minerals remain in the slurry, thereby improving the efficiency and accuracy of antimony-arsenic separation.

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

[0065] Among them, pine oil, also known as No. 2 oil, is a commonly used foaming agent in flotation operations. The specific amount of pine oil added can be 10g / t, 20g / t, 30g / t...100g / t.

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

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

[0068] Specifically, the pH value may be 5.5, 6.0, 6.5, ... 7.5.

[0069] In this embodiment, by controlling the pH value of the slurry in the weakly acidic to neutral range of 5.5-7.5, the properties of the slurry are more stable and the quality of the foam is better. Stable slurry and high-quality foam help reduce the entrainment of impurities such as gangue minerals and arsenic minerals during the gravity separation process. During the gravity separation process, only antimony minerals with hydrophobic surfaces can effectively attach to bubbles and float to the foam layer and then enter the light product of gravity separation, while arsenic minerals and other impurities are not conducive to attaching to bubbles and entering the heavy product of gravity separation due to their surface properties, and will remain in the slurry, thereby improving the purity of the antimony concentrate.

[0070] Preferably, in step S3, the gravity selection is carried out using a spiral chute or a shaking table.

[0071] Among them, the specific steps of using the spiral chute are as follows:

[0072] S31 feeding: the antimony concentrate slurry is fed evenly into the upper end of the spiral chute. The slurry flows downward along the spiral chute under the action of gravity, and the mineral particles in the slurry are affected by centrifugal force due to the rotation of the spiral chute.

[0073] S32 Stratification: During the flow in the spiral groove, the arsenic mineral particles with higher density and the antimony mineral particles with lower density are stratified under the combined effect of gravity, centrifugal force, the impact of water flow, and the friction force at the bottom of the groove. The arsenic mineral particles with higher density tend to approach the inner edge of the spiral groove and gradually settle, while the antimony mineral particles with lower density are relatively concentrated at the outer edge of the slurry flow and remain relatively suspended.

[0074] S33 zoning: As the slurry continues to flow downward, the mineral particles gradually form different zones. On the transverse section of the spiral chute, there are high-density arsenic mineral-enriched zones and low-density antimony mineral-enriched zones from the inner edge to the outer edge.

[0075] S34 interception: At the lower end of the spiral chute, according to the mineral zoning, an interceptor is used to intercept and collect the ore pulp in different zones separately, thereby achieving the initial separation of antimony and arsenic.

[0076] The shaking table is used to separate antimony and arsenic based on the inclined water flow, as follows:

[0077] On the shaking table, under the combined action of the lateral water flow and the longitudinal differential reciprocating motion of the bed surface, mineral particles of different densities and particle sizes produce different movement trajectories. Arsenic mineral particles with higher density move slower in the longitudinal direction of the bed surface and are less affected by the lateral water flow, and will gradually be enriched near the concentrate end of the bed surface; while antimony mineral particles with lower density move relatively faster in the longitudinal direction, and will move more toward the tailings end under the action of the lateral water flow, thus achieving antimony-arsenic separation.

[0078] Preferably, in step S2, the slurry adjustment time is 3 to 10 minutes, and in step S3, the number of reselection is 1 to 5 times.

[0079] The slurry adjustment time can be 3 minutes, 4 minutes, 5 minutes...10 minutes, preferably 4-6 minutes, and the number of reselection can be 1 time, 2 times, 3 times...5 times, preferably 2-3 times.

[0080] In this embodiment, if the slurry mixing time is too short, that is, less than 3 minutes, the collector does not have enough time to fully contact the antimony mineral and take effect. Some antimony minerals cannot be effectively captured, resulting in a reduced recovery rate of antimony, and a large amount of antimony minerals remain in the slurry and are discharged as tailings together with arsenic minerals, resulting in a waste of resources. If the slurry mixing time is too long, that is, more than 10 minutes, the collector may be excessively adsorbed on the surface of the antimony mineral, making the surface of the antimony mineral too hydrophobic, causing some impurity minerals that should not float to attach to the bubbles along with the antimony minerals and enter the heavy selection light product, thereby reducing the grade of the antimony concentrate. At the same time, too long slurry mixing time may also cause the antimony minerals that have been attached to the bubbles to fall off and return to the slurry, affecting the separation efficiency.

[0081] In this embodiment, it is often difficult to completely separate antimony ore and arsenic ore in one re-selection, so increasing the number of re-selections can make the antimony ore continuously enriched in each re-selection process. Through multiple re-selections, these mixed minerals can be further separated in the subsequent re-selection process, gradually improving the grade of antimony concentrate, reducing the arsenic content therein, and achieving more accurate separation. However, if the number of re-selections is too many, that is, more than 5 times, the possibility of mineral loss during multiple transfers and treatments will also increase, and the energy consumption during the operation of the equipment will also increase accordingly, resulting in an increase in production costs.

[0082] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below through several specific embodiments.

[0083] Example 1

[0084] Taking a arsenic-containing antimony concentrate as raw material, the main mineral types are stibnite (Sb2S3), arsenopyrite (arsenic pyrite FeAsS), pyrite (FeS2), followed by quartz (SiO2), carbonate (CO3 2- ) feldspar minerals (potassium feldspar, sodium feldspar), among which arsenic-antimony concentrate contains 25.07% antimony and 1.29% arsenic.

[0085] Figure 2 The process flow chart for reducing the arsenic content in antimony concentrate provided in Example 1 of the present invention is shown as follows: Figure 2 As shown, firstly, the arsenic-containing antimony concentrate (containing 25.07% antimony and 1.29% arsenic) is ground, and after grinding, the arsenic-containing antimony concentrate is screened with a 60-mesh sieve as the standard to separate the arsenic-containing antimony concentrate with a fineness of less than 60 mesh (i.e., the fineness of the antimony concentrate is 250 microns), and water is added to the screened arsenic-containing antimony concentrate to form a slurry;

[0086] 100 g / t of arsenic inhibitor dextrin and 1000 g / t of hydroxy polyacrylamide, 200 g / t of antimony activator lead nitrate, 10 g / t of antimony collector butylammonium and 10 g / t of frother pine oil were added to the slurry at a stirring rate of 150 r / min while stirring to prepare the slurry to obtain gravity separation slurry, wherein the pH value of the gravity separation slurry was controlled to be 6, and the slurry preparation stirring time was 5 minutes;

[0087] The gravity separation slurry is subjected to gravity separation by using a shaking table for three times to obtain antimony concentrate, arsenic-containing product and middlings;

[0088] The middlings are 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-antimony concentrate is used as raw material, and the mineral type and content are the same as those in Example 1.

[0091] Figure 3 The process flow chart for reducing the arsenic content in antimony concentrate provided in Comparative Example 1 of the present invention is shown as follows: Figure 3 As shown, in Comparative Example 1, after grinding, the arsenic antimony concentrate is separated only by a shaking table, that is, Comparative Example 1 separates antimony and arsenic by a single gravity separation method to obtain antimony concentrate, arsenic-containing products and middlings.

[0092] Comparative Example 2

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

[0094] Figure 4 The process flow chart of reducing the arsenic content in antimony concentrate provided in Comparative Example 2 of the present invention is shown as follows: Figure 4 As shown, the arsenic antimony concentrate in Comparative Example 2 is separated by only adding flotation agents after grinding. The type and amount of flotation agents are the same as those in Example 1, that is, Comparative Example 2 uses a single flotation method to separate antimony and arsenic to obtain antimony concentrate and arsenic-containing products.

[0095] Table 1 shows a comparison table of indicators between the process of Example 1 and the processes of Comparative Examples 1 and 2. As shown in Table 1, the results show that the yield of antimony concentrate is 64.87%, the antimony grade is 34.95%, the arsenic grade is 0.62%, the antimony recovery rate is 90.40%, and the arsenic recovery rate is 31.48%. Before the separation of antimony and arsenic, the arsenic-antimony ratio in the antimony concentrate is 5.15%, which is greater than 2%. After the separation by the 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 arsenic content is at a low level and the quality of the antimony concentrate can better meet industry requirements; the interference of arsenic on the performance of antimony is significantly reduced, thereby improving the purity and quality of the antimony concentrate, making it more suitable for use in fields with higher purity requirements, such as electronics, semiconductors and other industries.

[0097] The process for reducing the arsenic content in antimony concentrate provided in Example 1 suppresses the arsenic in the pulp by adding dextrin and hydroxy polyacrylamide, uses lead nitrate as an antimony activator, butyl ammonium as an antimony collector, and pine oil as a frother. Under the joint action of the above flotation reagents, the antimony in the pulp can be floated into the light product of gravity separation. The flotation reagent is added in the gravity separation operation and the middling ore is returned to the gravity separation slurry for gravity separation again to 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, antimony activator and arsenic inhibitor are added in the system. The arsenic-antimony ratio is less than 2%, the process equipment is simple, and the separation accuracy of antimony and arsenic is effectively improved.

[0098] Table 1 Comparison of process parameters of Example 1 and Comparative Examples 1 and 2

[0099]

[0100] Example 2

[0101] Example 2 uses the same process flow as Example 1 to separate antimony and arsenic, with the only difference being that 500 g / t of dextrin and 500 g / t of hydroxy polyacrylamide, 600 g / t of antimony activator lead nitrate, 60 g / t of antimony collector butyl ammonium and 50 g / t of foaming agent pine oil are slurried to obtain gravity separation slurry, and the slurry mixing time is 4 minutes.

[0102] Comparative Example 3

[0103] After grinding, the arsenic antimony concentrate in Comparative Example 3 is separated by adding only flotation agents. The type and amount of flotation agents are the same as those in Example 2. That is, Comparative Example 3 separates antimony and arsenic by single flotation to obtain antimony concentrate and arsenic-containing products.

[0104] Table 2 shows a comparison table of indicators between the process of Example 2 and 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 Example 2 is adopted, the arsenic-antimony ratio in the antimony concentrate is 1.74%, which is less than 2%. Using the separation process of Comparative Example 1, the arsenic-antimony ratio in the antimony concentrate is 2.33%, which is greater than 2%; using the separation process of Comparative Example 3, the arsenic-antimony ratio in the antimony concentrate is 2.23%, which is greater than 2%.

[0105] The process for reducing the arsenic content in antimony concentrate provided in this embodiment 2 adopts the method of adding flotation agents during gravity separation, that is, arsenic in the antimony concentrate is removed by gravity separation, and antimony collectors, antimony activators and arsenic inhibitors are added to the system to make the arsenic-antimony ratio less than 2%. The process equipment is simple and the separation accuracy of antimony and arsenic is effectively improved.

[0106] Table 2 Comparison of process parameters of Example 2 and Comparative Examples 1 and 3

[0107]

[0108] Example 3

[0109] Example 3 uses the same process flow as Example 1 to separate antimony and arsenic, with the only difference being that 1000 g / t of dextrin and 100 g / t of hydroxypolyacrylamide, 1000 g / t of antimony activator lead nitrate, 100 g / t of antimony collector butylammonium and 100 g / t of foaming agent pine oil are slurried to obtain gravity separation slurry, and the slurry mixing time is 4 minutes.

[0110] Comparative Example 4

[0111] In Comparative Example 4, the arsenic antimony concentrate is separated by adding only flotation agents after grinding. The type and amount of the flotation agents are the same as those in Example 3. That is, Comparative Example 4 separates antimony and arsenic by single flotation to obtain antimony concentrate and arsenic-containing products.

[0112] Table 3 shows a comparison table of indicators between the process of Example 3 and the processes of Comparative Examples 1 and 4. As shown in Table 3, 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 Example 3, the arsenic-antimony ratio in the antimony concentrate is 1.74%, which is less than 2%. Using the separation process of Comparative Example 1, the arsenic-antimony ratio in the antimony concentrate is 2.33%, which is greater than 2%; using the separation process of Comparative Example 4, the arsenic-antimony ratio in the antimony concentrate is 2.23%, which is greater than 2%.

[0113] The process for reducing the arsenic content in antimony concentrate provided in this Example 3 adopts the method of adding flotation agents during gravity separation, that is, arsenic in the antimony concentrate is removed by gravity separation, and antimony collectors, antimony activators and arsenic inhibitors are added to the system to make the arsenic-antimony ratio less than 2%. The process equipment is simple and the separation accuracy of antimony and arsenic is effectively improved.

[0114] Table 3 Comparison of process parameters of Example 3 and Comparative Examples 1 and 4

[0115]

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

[0117] In addition, the present invention 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.

[0118] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0119] For the method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the order of the actions described, because according to the present invention, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and components involved are not necessarily required by the present invention.

[0120] The above is a detailed introduction to a process for reducing the arsenic content in antimony concentrate provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A process for reducing the arsenic content in antimony concentrate, characterized in that: The process comprises the following steps: S1. Grinding the arsenic-containing antimony concentrate to form a slurry; S2, adding appropriate amounts of arsenic inhibitor dextrin and hydroxy polyacrylamide, antimony activator lead nitrate, antimony collector butyl ammonium and foaming agent pine oil to the ore pulp for slurry adjustment to obtain gravity separation slurry; S3, performing gravity separation on the gravity separation slurry to obtain antimony concentrate, arsenic-containing products and middlings; S4, returning the medium ore to step S2, and repeating steps S2-S3; Calculated per ton of ore, the added amount of dextrin is 10-1200 g / t; the added amount of hydroxy polyacrylamide is 50-1400 g / t; the added amount of lead nitrate is 100-1200 g / t; the added amount of butyl ammonium is 5-150 g / t; and the added amount of pine oil is 5-130 g / t.

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

3. The process according to claim 1, characterized in that In step S2, the added amount of dextrin is 100-1000 g / t per ton of ore.

4. The process according to claim 1, characterized in that In step S2, the amount of hydroxy polyacrylamide added is 100-1000 g / t per ton of ore.

5. The process according to claim 1, characterized in that In step S2, the amount of lead nitrate added is 200-1000 g / t per ton of ore.

6. The process according to claim 1, characterized in that In step S2, the amount of butylammonium added is 10-100 g / t per ton of ore.

7. The process according to claim 1, characterized in that In step S2, the amount of pine oil added is 10-100 g / t per ton of ore.

8. The process according to claim 1, characterized in that In step S2, the pH of the slurry adjustment process is 5.5-7.

5.

9. The process according to claim 1, characterized in that In step S3, the gravity selection is carried out using a spiral chute or a shaking table.

10. The process according to claim 1, characterized in that In step S2, the slurry adjustment time is 3 to 10 minutes, and in step S3, the number of reselection is 1 to 5 times.

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