A method for separating and recovering arsenic, antimony and gold from arsenic-antimony-gold-containing water-quenched slag through synergic roasting based on pellet micro-reaction structure regulation

Abstract

The application discloses a method for recovering arsenic, antimony and gold by cooperating roasting and separating based on pellet micro-reaction structure regulation of arsenic-antimony-gold-containing water-quenched slag, and belongs to the technical field of metallurgical solid waste resource recovery. The method is that after crushing and grinding of the arsenic-antimony-gold-containing water-quenched slag, the slag is mixed with carbonaceous reducing agent, alkali salt structure regulation agent, lead-based trapping agent, low-melting-point phase-forming accelerator and binder to form pellets, and the obtained pellet materials are placed in a roasting furnace to be roasted in a reducing or weakly reducing atmosphere, and in the roasting process, arsenic compounds are condensed and recovered from flue gas, and antimony and gold enter the liquid phase formed by the lead-based trapping agent and the low-melting-point phase-forming accelerator. The method preferentially converts the arsenic component into volatile arsenic-containing species into the flue gas system for recovery, and at the same time, the antimony and gold are selectively trapped by the lead-based liquid trapping phase and enriched in the metal phase in the roasting product, so that efficient and selective separation and recovery of arsenic, antimony and gold and other metals are realized.

Description

Technical Field

[0001] This invention relates to a method for the resource utilization of metallurgical solid waste, and particularly to a method for the co-roasting separation and recovery of arsenic, antimony and gold from arsenic-containing antimony-gold water-quenched slag based on the micro-reaction structure regulation of pellets, belonging to the field of metallurgical solid waste resource utilization and recycling technology. Background Technology

[0002] Antimony is widely used in flame-retardant materials, lead-acid batteries, alloy materials, polyester catalysts, and semiconductors. With the gradual depletion of high-grade antimony resources, antimony-containing solid waste generated during antimony smelting is becoming an important secondary resource. Water-quenched slag is a glassy or semi-glassy solid waste formed by the rapid cooling of high-temperature molten slag during antimony smelting. It typically contains matrix components such as Fe, Ca, and Si, and is accompanied by certain amounts of As, Sb, and Au, presenting a dual need for harmless disposal and resource recovery.

[0003] Currently, the challenges in treating arsenic-antimony-gold water-quenched slag are twofold: First, the arsenic component is encapsulated by a glassy silicate matrix, making it difficult to recover valuable metals using conventional wet leaching. Second, antimony and gold are of low grade and dispersed, leading to technical problems such as antimony-gold volatilization loss, low enrichment efficiency, and high processing costs when using conventional smelting or single roasting methods. Therefore, there are few existing methods for the resource utilization of arsenic-antimony-gold water-quenched slag. For example, Chinese patent application (CN1621544A) discloses a method for recovering indium, lead, zinc, antimony, and silver from indium-lead-antimony smelting waste—water-quenched slag. This method involves treating indium-containing lead-antimony smelting water-quenched slag in a reduction furnace, using high-temperature reduction volatilization above 1100℃ to obtain flue dust rich in indium, zinc, lead, antimony, and silver. The flue dust is then subjected to wet processing to separate and recover indium, zinc, lead, antimony, and silver respectively. This method requires first using high-temperature reduction and volatilization to enrich the useful metals, and then using a wet process to separate precious metals such as indium, zinc, lead, antimony, and silver. The process is long and complex. Summary of the Invention

[0004] To address the technical deficiencies in existing methods for treating arsenic-antimony-gold water-quenched slag, the present invention aims to provide a method for the co-calcination separation and recovery of arsenic, antimony, and gold from arsenic-antimony-gold water-quenched slag based on pellet micro-reaction structure regulation. This method addresses the characteristics of arsenic, antimony, and gold coexisting in the slag and being encapsulated by a glassy silicate matrix, exhibiting dispersion and other features. By pelletizing the slag, and constructing arsenic volatilization channels and a lead-based liquid trapping phase within the pellets using carbonaceous reducing agents, alkali-salt structure regulators, lead-based trapping agents, and low-melting-point phase-forming promoters, arsenic volatilization channels and a lead-based liquid trapping phase are preferentially converted into volatile arsenic-containing species for recovery in the flue gas system. Simultaneously, antimony and gold are selectively trapped and enriched in the metallic phase of the calcination product by the lead-based liquid trapping phase, achieving highly efficient and selective separation of arsenic, antimony, and gold.

[0005] To achieve the above technical objectives, this invention provides a method for the co-calcination separation and recovery of arsenic, antimony, and gold from arsenic-containing antimony-gold water-quenched slag based on pellet micro-reaction structure regulation. The method includes the following steps:

[0006] S1: The arsenic-antimony-gold water-quenched slag is crushed and ground to obtain finely ground water-quenched slag;

[0007] S2: The finely ground water-quenched slag is mixed with carbonaceous reducing agent, alkali salt structure regulator, lead-based scavenger, low-melting-point phase-forming promoter and binder, and water is added to form pellets. After drying, pellet material is obtained.

[0008] S3: The pellets are placed in a roasting furnace and roasted in a reducing or weakly reducing atmosphere. During the roasting process, arsenic compounds are condensed and recovered from the flue gas, while antimony and gold enter the liquid phase formed by the lead-based trapping agent and the low-melting-point phase-forming promoter.

[0009] The key to achieving the separation of arsenic, antimony, and gold in arsenic-antimony-gold water-quenched slag of this invention lies in: pelletizing the arsenic-antimony-gold water-quenched slag, and using auxiliaries such as carbonaceous reducing agents, alkali salt structure regulators, lead-based trapping agents, and low-melting-point phase-forming promoters to construct arsenic volatilization channels and lead-based liquid trapping phases inside the pellets. This allows the arsenic component to be preferentially converted into volatile arsenic-containing species and recovered into the flue gas system. At the same time, antimony and gold are selectively trapped by the lead-based liquid trapping phase and enriched in the metallic phase of the roasting product, thus achieving efficient and selective separation of metals such as arsenic, antimony, and gold. More specifically, after the arsenic-antimony-gold water-quenched slag is pelletized, a sintered shell with a certain mechanical strength is formed on the surface of the pellets during the roasting process. This creates an independent micro-reaction zone inside the entire pellet, which enhances the high-temperature solid-phase reaction between various additives and the arsenic-antimony-gold water-quenched slag. Among them, the alkali salt structure regulator and carbonaceous reducing agent mainly synergistically promote the destruction of the arsenic-containing glass phase or arsenate phase structure, causing the arsenic component to transform into volatile arsenic-containing species. At the same time, the destruction of these phase structures creates a porous structure inside and on the surface of the pellets, which is conducive to the escape of volatile arsenic-containing species. Meanwhile, the low-melting-point phase-forming promoter and lead-based trapping agent form a lead-based liquid trapping phase, which selectively traps antimony and gold, which is conducive to the aggregation and growth of antimony and gold inside the pellets. This enriches antimony and gold in the metallic phase of the roasting product, thus achieving a perfect coupling between gas-phase dearsenic removal and liquid-phase trapping.

[0010] As a preferred embodiment, the arsenic-antimony-gold water-quenched slag is a glassy or semi-glassy water-quenched slag formed by rapid water quenching of high-temperature molten slag during antimony smelting. Its main elements are Fe, Ca, and Si, and it also contains As, Sb, and Au. The Sb content in the water-quenched slag is 0.5% to 5.0% by mass, the As content is 0.5% to 5.0% by mass, and the Au content is 0.1 to 10 g / t.

[0011] As a preferred embodiment, the particle size of the finely ground water-quenched slag is such that at least 70% is -40 mesh. Grinding the arsenic-antimony-gold water-quenched slag to an appropriate particle size is beneficial for pelletizing and can also improve the high-temperature solid-phase reaction between the arsenic-antimony-gold water-quenched slag and the additives. More preferably, the particle size of the finely ground water-quenched slag is such that at least 80% is -40 mesh.

[0012] As a preferred embodiment, the carbonaceous reducing agent includes at least one of pulverized coal, coke powder, activated carbon, and biochar.

[0013] As a preferred embodiment, the amount of carbonaceous reducing agent added is 4% to 12% of the mass of the arsenic-antimony-gold water-quenched slag. An appropriate amount of carbonaceous reducing agent is beneficial for promoting the conversion of arsenates and the volatilization of arsenic oxide in the water-quenched slag, while also serving to create a reducing or weakly reducing atmosphere. If the proportion of carbonaceous reducing agent is too low, the reduction and conversion of arsenates will be insufficient, resulting in a lower arsenic volatilization rate. If the proportion of carbonaceous reducing agent is too high, some antimony will be lost through volatilization. The amount of carbonaceous reducing agent added is further preferably 5% to 8% of the mass of the arsenic-antimony-gold water-quenched slag.

[0014] As a preferred embodiment, the alkali-salt structure modifier includes at least one of sodium carbonate, sodium sulfate, potassium carbonate, potassium sulfate, and calcium carbonate. The main function of the alkali-salt structure modifier is to react with the arsenic-containing glass phase or arsenate phase, reducing the structural stability of the arsenic component and promoting the transformation of arsenic into volatile arsenic-containing species during calcination. The preferred alkali-salt structure modifier can be converted into an active alkali metal oxide under calcination temperature conditions. This active alkali metal oxide can reduce the stability and activation energy of the arsenic-containing glass phase or arsenate phase, thereby destroying the original crystal structure of the arsenic-containing glass phase or arsenate phase at relatively low temperatures. This promotes the transformation of arsenate crystals into volatile oxidized arsenic within a lower effective temperature range, achieving preferential volatilization and removal of arsenic and improving the conversion efficiency of arsenate.

[0015] As a preferred embodiment, the amount of the alkali-salt structure modifier added is 1% to 6% of the mass of the arsenic-antimony-gold water-quenched slag. Adding too little alkali-salt structure modifier will result in low arsenic reduction and volatilization efficiency, or require higher temperatures to achieve arsenic volatilization, which will increase the volatilization loss of other metals.

[0016] As a preferred embodiment, the lead-based scavenger includes at least one of lead powder and lead oxide-containing materials. The preferred lead-based scavenger can form a continuous liquid phase with a low-melting-point phase-forming promoter under reducing roasting conditions to achieve efficient scavenging of antimony and gold, while reducing the volatilization of metals such as antimony. Lead oxide-containing materials include, for example, lead oxide, lead-containing smelting intermediates, or lead-containing secondary materials.

[0017] As a preferred embodiment, the amount of lead-based trap added is 3% to 15% of the mass of the arsenic-antimony-gold water-quenched slag. If the amount of lead-based trap is too low, it will be difficult to form a sufficient liquid phase to trap precious metals such as gold and antimony, resulting in poor enrichment of precious metals such as gold and antimony. If the amount of lead-based trap is too high, it will increase the subsequent cost of precious metal recovery.

[0018] As a preferred embodiment, the low-melting-point phase-forming promoter includes at least one of tin, tin oxide, stannous chloride, stannous sulfate, and tin-containing materials. During the roasting process, the low-melting-point phase-forming promoter forms a low-melting-point eutectic system with the lead-based scavenger and the antimony component in the water-quenched slag. This allows the lead-based metal phase to form a continuous liquid structure at a lower roasting temperature, thereby enabling the early and stable capture of precious metals such as antimony and gold. This effectively suppresses high-temperature volatilization losses and improves the recovery rate of antimony and gold.

[0019] As a preferred embodiment, the amount of the low-melting-point phase-forming promoter added is 0.5% to 5% of the mass of the arsenic-antimony-gold water-quenched slag. If the proportion of the low-melting-point phase-forming promoter is too low, the formation temperature of the lead-based liquid precipitate will be increased, and the high-temperature environment will increase the volatilization loss rate of metals such as antimony. Therefore, an appropriate amount of low-melting-point phase-forming promoter can promote the formation of a low-melting-point lead-based liquid precipitate at a lower temperature, so that antimony and gold are captured and enriched at a lower effective temperature, reducing the volatilization loss of antimony and gold during the high-temperature roasting process.

[0020] As a preferred embodiment, the binder includes at least one of bentonite, sodium humate, sodium lignosulfonate, and water glass. These binders are conventional binders in the art and can improve the granulation performance of water-quenched slag.

[0021] As a preferred embodiment, the amount of binder added is 1% to 8% of the mass of the arsenic-antimony-gold water-quenched slag.

[0022] As a preferred embodiment, the particle size of the pellet material is 8-20 mm.

[0023] As a preferred embodiment, the co-calcination temperature is 1200–1400℃, and the calcination time is 60–120 min. Within the preferred calcination temperature and time range, increasing the calcination temperature and extending the calcination time is beneficial for improving the volatilization of arsenic components and the recovery of antimony and gold components. However, excessively high temperatures can easily lead to the volatilization loss of antimony and gold components.

[0024] Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects:

[0025] First, the present invention pelletizes and roasts arsenic-antimony-gold water-quenched slag, thereby enhancing the high-temperature solid-phase reaction effect by constructing independent micro-reaction units inside the pellets.

[0026] Second, the present invention promotes the destruction and transformation of the structure of arsenic-containing glass phase or arsenate phase by synergistic action of alkaline salt structure regulator and carbonaceous reducing agent, so that the arsenic component is preferentially volatilized and removed.

[0027] Third, this invention forms a low-melting-point lead-based liquid trapping phase by using a low-melting-point phase-forming promoter and a lead-based trapping agent. This enables selective trapping of antimony and gold at lower temperatures, avoiding the high-temperature volatilization loss of metals such as antimony. It also facilitates the aggregation and growth of antimony and gold within the pellets, enriching antimony and gold in the metallic phase of the calcined product, thereby achieving a perfect coupling between gas-phase arsenic removal and liquid-phase trapping.

[0028] Fourth, the present invention can complete arsenic removal and antimony-gold recovery in the same roasting process, reduce multiple processing steps, and improve the resource utilization level of arsenic- and antimony-containing water-quenched slag. Detailed Implementation

[0029] The following examples are used to further illustrate the content of the present invention and are not intended to limit the scope of protection of the claims of the present invention.

[0030] Unless otherwise stated, all percentages mentioned in the examples are by mass.

[0031] Example 1

[0032] The arsenic-antimony-gold water-quenched slag produced by the hydrometallurgical plant of Hunan Chenzhou Mining Co., Ltd. was used as the research object. Its main elemental composition is shown in Table 1. As can be seen from Table 1, the water-quenched slag has high contents of Fe, Si and Ca, and also contains a certain amount of Sb and As, with trace amounts of Au. It belongs to the typical arsenic-antimony-gold polymetallic smelting water-quenched slag.

[0033] Table 1. Main elemental composition and content of water-quenched slag

[0034] The water-quenched slag was crushed and ground to achieve a particle size of 100% less than -40 mesh. 500g of finely ground water-quenched slag was weighed and mixed with a carbonaceous reducing agent (pulverized coal), an alkali-salt structure modifier (sodium carbonate), a lead-based trapping agent (lead oxide, 5%), a low-melting-point phase-forming promoter (tin oxide, 3%), and a binder (bentonite, 3%). After thorough mixing, an appropriate amount of water (8%) was added to form pellets, yielding pellets with a diameter of approximately 15mm. The pellets were dried and placed in a tubular roasting furnace for roasting under nitrogen protection and a weakly reducing atmosphere created by the carbonaceous reducing agent within the pellets. During roasting, the arsenic component preferentially transformed into volatile arsenic-containing species under the synergistic effect of the alkali-salt structure modifier and the carbonaceous reducing agent, and entered the flue gas system. The arsenic compounds were recovered after condensation and dust collection. During the roasting process, the low-melting-point phase-forming promoter and the lead-based scavenger work together to form a lead-based liquid scavenging phase that captures antimony and gold. After roasting, the recovery rates of antimony and gold in the roasting products were statistically analyzed, and the results are shown in Table 2.

[0035] Table 2. Effect of calcination conditions on arsenic volatilization rate

[0036] As shown in Table 2, the volatilization rate of arsenic in the water-quenched slag increases significantly with increasing calcination temperature and calcination time. Appropriately increasing the dosage of carbonaceous reducing agent and alkali-salt structure modifier is beneficial to the destruction of the glass phase structure of the water-quenched slag. Under the optimal conditions of 8% carbonaceous reducing agent, 3% alkali-salt structure modifier, calcination temperature of 1400℃ and calcination time of 90min, the arsenic volatilization rate reaches 96.7%, indicating that the synergistic calcination system constructed by alkali-salt structure modifier and carbonaceous reducing agent can effectively promote the volatilization and removal of arsenic components.

[0037] Example 2

[0038] The main elemental composition and content of water-quenched slag are shown in Table 1.

[0039] The water-quenched slag was crushed and ground to achieve a particle size of 100% less than -40 mesh. 500 g of finely ground water-quenched slag was weighed and mixed with a carbonaceous reducing agent (pulverized coal), an alkali-salt structure modifier (sodium carbonate, 3%), a lead-based trapping agent (lead oxide), a low-melting-point phase-forming promoter (tin oxide), and a binder (bentonite, 3%). After thorough mixing, an appropriate amount of water (8%) was added to form pellets, yielding pellets with a diameter of approximately 15 mm. The pellets were dried and placed in a tubular roasting furnace for roasting under nitrogen protection and a weakly reducing atmosphere created by the carbonaceous reducing agent within the pellets. During roasting, the arsenic component preferentially transformed into volatile arsenic-containing species under the synergistic effect of the alkali-salt structure modifier and the carbonaceous reducing agent, and entered the flue gas system. The arsenic compounds were recovered after condensation and dust collection. During the roasting process, the low-melting-point phase-forming promoter and the lead-based trapping agent work together to form a lead-based liquid trapping phase and trap antimony and gold. After roasting, the recovery rates of antimony and gold in the roasting products were statistically analyzed, and the results are shown in Table 3.

[0040] Table 3. Effect of roasting conditions on antimony and gold recovery rates

[0041] Table 3 shows that the recovery rates of antimony and gold significantly improved with optimized calcination conditions and the formation of a lead-based liquid trapping phase. Under the optimal conditions of 8% carbonaceous reducing agent, 10% lead-based trapping agent, 3% low-melting-point phase-forming promoter, calcination temperature of 1400℃, and calcination time of 90 min, the antimony recovery rate reached 92.6%, and the gold recovery rate reached 91.6%. These results demonstrate that this invention, through the regulation of pellet microreaction structure, the construction of arsenic volatilization channels, and the formation of a lead-based liquid trapping phase, can achieve selective separation of arsenic, antimony, and gold in the same calcination process.

[0042] Control group

[0043] Based on Examples 1 and 2, the optimal reaction conditions are as follows: 8% carbonaceous reducing agent, 3% alkali salt structure modifier, 10% lead-based scavenger, and 3% low-melting-point phase-forming promoter. When these additives are mixed with water-quenched slag to form pellets, and the calcination temperature is 1400℃ and the calcination time is 90 min, the arsenic volatilization rate reaches 96.7%, the antimony recovery rate reaches 92.6%, and the gold recovery rate reaches 91.6%.

[0044] The specific procedures for control groups 1-4 below are the same as in Example 1, but the specific reaction conditions differ from the optimal reaction conditions in the following ways:

[0045] Control group 1: Compared with the optimal reaction conditions: no alkali salt structure modifier was added. This was used to investigate the effect of the alkali salt structure modifier on the destruction of arsenic-containing glassy or arsenate phases and the volatilization and removal of arsenic.

[0046] Control group 2: Compared with the optimal reaction conditions: no low-melting-point phase-forming promoter was added. This was used to investigate the effect of the low-melting-point phase-forming promoter on the formation of lead-based liquid trapping phases and the trapping effect on antimony and gold.

[0047] Control group 3: Compared with the optimal reaction conditions: no lead-based trapping agent was added. Used to investigate the effect of lead-based trapping agents on the selective enrichment of antimony and gold.

[0048] Control group 4: Compared with the optimal reaction conditions: no pelletizing process was performed; the finely ground water-quenched slag was mixed with various additives and directly calcined as powder. This was used to investigate the effect of the micro-reaction structure of the pellets on the formation of arsenic volatilization channels and the liquid-phase capture of antimony and gold.

[0049] Table 4. Arsenic volatilization rate and antimony and gold recovery rates under control group conditions 1-4

[0050] As shown in Table 4, compared with the control groups, Example 1 showed better performance in terms of arsenic volatilization rate, antimony recovery rate, and gold recovery rate. In control group 1, due to the lack of alkali salt structure modifier, the structure of the arsenic-containing glass phase or arsenate phase was not sufficiently disrupted, limiting the conversion of arsenic components into volatile arsenic-containing species, resulting in a lower arsenic volatilization rate. In control group 2, due to the lack of low-melting-point phase-forming promoter, the formation temperature of the lead-based liquid trapping phase increased and the continuity was insufficient, which was not conducive to the stable trapping of antimony and gold during the roasting process. In control group 3, due to the lack of lead-based trapping agent, it was difficult to form an effective liquid metal trapping phase in the system, and antimony and gold were prone to dispersion residue or volatilization loss. In control group 4, direct roasting of powder made it difficult to form a stable pellet micro-reaction structure, and the arsenic volatilization channel and liquid phase trapping region were difficult to construct synergistically, resulting in a decrease in the selective separation effect of arsenic, antimony, and gold.

[0051] The above results demonstrate that this invention is not a simple high-temperature roasting or ordinary reduction volatilization process, but rather achieves efficient and selective separation and recovery of arsenic, antimony, and gold from arsenic-antimony-gold water-quenched slag through the synergistic effect of pellet micro-reaction structure, alkali salt-promoted arsenic volatilization, lead-based liquid phase trapping, and low-melting-point phase formation promotion.

Claims

1. A method for the separation and recovery of arsenic, antimony, and gold from arsenic-containing, antimony-gold water-quenched slag based on pellet micro-reaction structure regulation, characterized in that: Includes the following steps: S1: The arsenic-antimony-gold water-quenched slag is crushed and ground to obtain finely ground water-quenched slag; S2: The finely ground water-quenched slag is mixed with carbonaceous reducing agent, alkali salt structure regulator, lead-based scavenger, low-melting-point phase-forming promoter and binder, and water is added to form pellets. After drying, pellet material is obtained. The alkali-salt structure modifier includes at least one of sodium carbonate, sodium sulfate, potassium carbonate, potassium sulfate, and calcium carbonate. The low-melting-point phase-forming promoter includes at least one of tin, tin oxide, stannous chloride, and stannous sulfate; S3: The pellets are placed in a roasting furnace and roasted in a reducing or weakly reducing atmosphere. During the roasting process, arsenic compounds are condensed and recovered from the flue gas, while antimony and gold enter the liquid phase formed by the lead-based trapping agent and the low-melting-point phase-forming promoter.

2. The method for separating and recovering arsenic, antimony, and gold from arsenic-containing, antimony-gold water-quenched slag based on pellet micro-reaction structure regulation according to claim 1, characterized in that: The arsenic-antimony-gold water-quenched slag is a glassy or semi-glassy water-quenched slag formed by rapid water quenching of high-temperature molten slag during antimony smelting. Its main elements are Fe, Ca, and Si, and it also contains As, Sb, and Au. The Sb content in the water-quenched slag is 0.5% to 5.0% by mass, the As content is 0.5% to 5.0% by mass, and the Au content is 0.1 to 10 g / t.

3. A method for the separation and recovery of arsenic, antimony, and gold from arsenic-containing antimony-gold water-quenched slag based on pellet micro-reaction structure regulation according to claim 1 or 2, characterized in that: The particle size of the finely ground water-quenched slag must meet the requirement that -40 mesh accounts for no less than 70%.

4. The method for separating and recovering arsenic, antimony, and gold from arsenic-containing antimony-gold water-quenched slag based on pellet microreaction structure regulation according to claim 1, characterized in that: The carbonaceous reducing agent includes at least one of pulverized coal, coke powder, activated carbon, and biochar. The amount of carbonaceous reducing agent added is 4% to 12% of the mass of the arsenic-antimony-gold water-quenched slag.

5. The method for separating and recovering arsenic, antimony, and gold from arsenic-containing, antimony-gold water-quenched slag based on pellet microreaction structure regulation according to claim 1, characterized in that: The amount of the alkali-salt structure modifier added is 1% to 6% of the mass of the arsenic-antimony-gold water-quenched slag.

6. The method for separating and recovering arsenic, antimony, and gold from arsenic-containing antimony-gold water-quenched slag based on pellet microreaction structure regulation according to claim 1, characterized in that: The lead-based trapping agent includes at least one of lead powder and lead oxide-containing materials; The amount of lead-based scavenger added is 3% to 15% of the mass of the arsenic-antimony-gold water-quenched slag.

7. The method for separating and recovering arsenic, antimony, and gold from arsenic-containing antimony-gold water-quenched slag based on pellet microreaction structure regulation according to claim 1, characterized in that: The amount of the low-melting-point phase-forming promoter added is 0.5% to 5% of the mass of the arsenic-antimony-gold water-quenched slag.

8. The method for separating and recovering arsenic, antimony, and gold from arsenic-containing, antimony-gold water-quenched slag based on pellet microreaction structure regulation according to claim 1, characterized in that: The binder includes at least one of bentonite, sodium humate, sodium lignosulfonate, and water glass. The amount of binder added is 1% to 8% of the mass of the arsenic-antimony-gold water-quenched slag.

9. The method for separating and recovering arsenic, antimony, and gold from arsenic-containing antimony-gold water-quenched slag based on pellet microreaction structure regulation according to claim 1, characterized in that: The particle size of the pellets is 8–20 mm.

10. A method for separating and recovering arsenic, antimony, and gold from arsenic-antimony-gold water-quenched slag based on pellet microreaction structure regulation according to claim 1, 2, 4, 6, 7, 8, or 9, characterized in that: The synergistic calcination temperature is 1200–1400℃, and the calcination time is 60–120 min.

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