Equipment for preparing metal arsenic by using composite reducing agent

Abstract

The utility model provides equipment for preparing metal arsenic by using a composite reducing agent, which is used for reducing refined arsenic through zinc powder and carbon powder. The equipment for preparing the metal arsenic through the composite reducing agent comprises a first reduction furnace, an elemental arsenic collecting device and a second reduction furnace. The first reduction furnace is provided with a first furnace material inlet, a first furnace gas inlet, a first furnace tailing outlet and a first furnace gas outlet. The first furnace material inlet is used for inputting refined arsenic, zinc powder and carbon powder, and the first furnace gas inlet is used for outputting first arsenic-containing gas. And the elemental arsenic collecting device is connected with the first furnace gas outlet. The second reduction furnace is provided with a second furnace material inlet, a second furnace gas main outlet, a second furnace gas auxiliary outlet and a second furnace tailing outlet. And the second furnace material inlet is connected to the first furnace tailing outlet. The second furnace gas main outlet is connected to the first furnace gas inlet. According to the equipment for preparing the metal arsenic by the composite reducing agent, zinc can be recycled, the consumption of the zinc is reduced, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment for preparing metallic arsenic, in particular to equipment for preparing metallic arsenic using a composite reducing agent. Background Art

[0002] Elemental arsenic has important industrial uses and is widely used in alloy smelting, pesticides, medicines, pigments and other industrial fields. Refined white arsenic is highly toxic and its main component is arsenic trioxide. It is often used as a raw material for preparing elemental arsenic in industrial production. In the prior art, arsenic is generally prepared by carbon thermal reduction. The equipment for preparing metallic arsenic mainly includes a reduction furnace and a crystallizer. The reducing agent carbon powder and refined white arsenic are mixed, and the two are heated in the reduction furnace to obtain gaseous arsenic, which is then collected in a crystallizer to obtain solid elemental arsenic. In order to increase the speed of preparing metallic arsenic, a composite reducing agent, such as carbon powder and zinc powder, can be used. However, when using the equipment for preparing metallic arsenic in the prior art to reduce refined white arsenic with a composite reducing agent, the consumption of zinc powder is large and the cost is high.

[0003] Therefore, it is necessary to provide a composite reducing agent for preparing metallic arsenic equipment to solve the above technical problems. Utility Model Content

[0004] The utility model provides equipment for preparing metallic arsenic by using a composite reducing agent, which can recycle zinc, reduce zinc consumption and save costs.

[0005] The technical solution of the utility model is:

[0006] A composite reducing agent for preparing metallic arsenic equipment, which reduces refined white arsenic by zinc powder and carbon powder, is characterized in that the composite reducing agent for preparing metallic arsenic equipment comprises:

[0007] The first reduction furnace is provided with a first furnace material inlet, a first furnace gas inlet, a first furnace tailings outlet and a first furnace gas outlet; the first furnace material inlet is used to input refined white arsenic, zinc powder and carbon powder; the first furnace tailings outlet is used to output zinc-carbon tailings; the first furnace gas outlet is used to output the first arsenic-containing gas;

[0008] an elemental arsenic collecting device connected to the first furnace gas outlet, the elemental arsenic collecting device being used to collect solid elemental arsenic; and

[0009] The second reduction furnace is provided with a second furnace material inlet, a second furnace gas main outlet, a second furnace gas secondary outlet and a second furnace tailings outlet; the second furnace material inlet is connected to the first furnace tailings outlet; the second furnace gas main outlet is used to output zinc-arsenic gas, and the second furnace gas main outlet is connected to the first furnace gas inlet; the second furnace gas secondary outlet is used to output zinc-arsenic gas; the second furnace tailings outlet is used to output solid tailings.

[0010] In the composite reducing agent preparation metallic arsenic device of the present invention, the elemental arsenic collecting device comprises:

[0011] a first high-temperature gas-solid separator, which is provided with a first separator inlet, a first separator gas outlet, and a first separator solid outlet; the first separator inlet is connected to the first furnace gas outlet; the first separator gas outlet is used to output the second arsenic-containing gas; the first separator solid outlet is used to output solid impurities; and,

[0012] The crystallization tank is provided with a tank gas inlet, a tank gas outlet and a tank solid outlet; the tank gas inlet is connected to the first separator gas outlet; the tank gas outlet is used to output the third arsenic-containing gas; the tank solid outlet is used to output solid elemental arsenic.

[0013] In the composite reducing agent preparation metal arsenic equipment of the present invention, the composite reducing agent preparation metal arsenic equipment further comprises a refined white arsenic recovery device connected to the second furnace gas secondary outlet, the refined white arsenic recovery device is used to recover refined white arsenic.

[0014] In the composite reducing agent preparation metal arsenic equipment of the utility model, the refined white arsenic recovery device includes:

[0015] a second high-temperature gas-solid separator, which is provided with a second separator inlet, a second separator gas outlet, and a second separator solid outlet; the second separator inlet is connected to the second furnace gas auxiliary outlet; the second separator solid outlet is used to output solid impurities; the second separator gas outlet is used to output a fourth arsenic-containing gas; and,

[0016] The condensation chamber comprises a condensation inlet, a condensed solid outlet and a condensed gas outlet; the condensation inlet is connected to the gas outlet of the second separator; the condensed solid outlet is used to output refined white arsenic; and the condensed gas outlet is used to output waste gas.

[0017] In the equipment for preparing metallic arsenic using a composite reducing agent of the present invention, the tank gas outlet is connected to the condensation inlet.

[0018] In the equipment for preparing metallic arsenic using a composite reducing agent described in the utility model, the equipment further comprises a tail gas purification device, the inlet of which is connected to the condensed gas outlet.

[0019] In the equipment for preparing metallic arsenic using a composite reducing agent of the present invention, the tank gas outlet is connected to the first furnace gas inlet.

[0020] In the composite reducing agent preparation metal arsenic equipment of the present invention, the first reduction furnace is further provided with a first furnace nitrogen inlet for inputting nitrogen; the second reduction furnace is further provided with a second furnace nitrogen inlet for inputting nitrogen.

[0021] In the composite reducing agent preparation metal arsenic equipment described in the present invention, the first reduction furnace is a horizontally inclined rotary kiln, the first furnace material inlet and the first furnace gas inlet are arranged at the higher end of the first reduction furnace, and the first furnace tailings outlet and the first furnace gas outlet are arranged at the lower end of the first reduction furnace.

[0022] In the composite reducing agent preparation metal arsenic equipment described in the present invention, the second reduction furnace is a horizontally inclined rotary kiln, the second furnace material inlet is arranged at the higher end of the second reduction furnace, and the second furnace gas main outlet, the second furnace gas secondary outlet and the second furnace tail slag outlet are arranged at the lower end of the second reduction furnace.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the composite reducing agent preparation metal arsenic equipment of the present invention allows zinc oxide and carbon powder to react to generate gaseous zinc through the second reduction furnace, and the zinc-arsenic gas is input into the first reduction furnace. The zinc in the zinc-arsenic gas can continue to be used as a reducing agent, and the zinc is recycled, thereby reducing the consumption of zinc. The arsenic trioxide in the zinc-arsenic gas can also continue to be reduced, saving the cost of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the present invention.

[0025] Figure 1 This is a schematic structural diagram of the equipment for preparing metallic arsenic using a composite reducing agent provided in the first preferred embodiment of the present utility model.

[0026] Figure 2 This is a schematic structural diagram of a device for preparing metallic arsenic using a composite reducing agent provided in the second preferred embodiment of the present invention.

[0027] in,

[0028] 11. First reduction furnace, 111. First furnace material inlet, 112. First furnace gas inlet, 113. First furnace tailings outlet, 114. First furnace gas outlet, 115. First furnace nitrogen inlet,

[0029] 12. Arsenic collection device,

[0030] 121, first high-temperature gas-solid separator, 1211, first separator inlet, 1212, first separator gas outlet, 1213, first separator solid outlet,

[0031] 122, crystallization tank, 1221, tank gas inlet, 1222, tank gas outlet, 1223, tank solid outlet,

[0032] 13. Second reduction furnace, 131. Second furnace material inlet, 132. Second furnace gas main outlet, 133. Second furnace gas secondary outlet, 134. Second furnace tail slag outlet, 135. Second furnace nitrogen inlet,

[0033] 14. Refined white arsenic recovery device,

[0034] 141. Second high-temperature gas-solid separator, 1411. Second separator inlet, 1412. Second separator gas outlet, 1413. Second separator solid outlet,

[0035] 142. Condensation chamber, 1421. Condensation inlet, 1422. Condensed solid outlet, 1423. Condensed gas outlet,

[0036] 15. Exhaust gas purification device.

[0037] In the figures, structurally similar elements are denoted by the same reference numerals. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0039] Directional terms mentioned in this invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used with reference to the directions of the drawings. The directional terms used are used to illustrate and understand the invention, and are not intended to limit the invention.

[0040] The terms "first" and "second" in the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor as limiting the order of precedence.

[0041] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0042] Arsenic is a non-metallic element that exists in nature and is widely used in industries such as alloy smelting, pesticides, medicines, and pigments. Refined white arsenic is highly toxic, and its main component is arsenic trioxide. It is often used as a raw material for preparing elemental arsenic in industrial production. In the prior art, arsenic is generally prepared by carbon thermal reduction. The equipment for preparing metallic arsenic mainly includes a reduction furnace and a crystallizer. The reducing agent carbon powder and refined white arsenic are mixed, and the two are heated in the reduction furnace to obtain gaseous arsenic, which is then collected in a crystallizer to obtain solid elemental arsenic. In order to increase the speed of preparing metallic arsenic, a composite reducing agent, namely carbon powder and zinc powder, can be used. However, using the equipment for preparing metallic arsenic in the prior art to reduce refined white arsenic with a composite reducing agent, the consumption of zinc powder is large and the cost is high.

[0043] The following is a preferred embodiment of a composite reducing agent preparation device for metallic arsenic provided by the present invention that can solve the above technical problems.

[0044] Please refer to Figure 1 The preferred embodiment of the present invention provides a composite reducing agent for producing metallic arsenic, which reduces refined white arsenic by zinc powder and carbon powder. The composite reducing agent for producing metallic arsenic includes a first reduction furnace 11, an elemental arsenic collection device 12, and a second reduction furnace 13.

[0045] The first reduction furnace 11 is equipped with a first furnace material inlet 111, a first furnace gas inlet 112, a first furnace tailings outlet 113, and a first furnace gas outlet 114. The first furnace material inlet 111 is used to input refined white arsenic, zinc powder, and carbon powder. The first furnace tailings outlet 113 is used to output zinc-carbon tailings. The first furnace gas outlet 114 is used to output the first arsenic-containing gas. The temperature of the first reduction furnace 11 is 800°C-900°C, and the reaction time is 4 hours. The main reaction chemical formula of the materials in the first reduction furnace 11 is:

[0046] 2As2O3+Zn+3C=CO(g)+2CO2(g)+ZnO(s)+As4(g)

[0047] 2As2O3(s)+6C=As4(g)+6CO(g)

[0048] 2As2O3(s)+6CO(g)=As4(g)+6CO2(g)

[0049] Among them, s represents solid state and g represents gas state.

[0050] The elemental arsenic collecting device 12 is connected to the first furnace gas outlet 114 , and the elemental arsenic collecting device 12 is used to collect solid elemental arsenic.

[0051] The second reduction furnace 13 is provided with a second furnace material inlet 131, a second furnace gas main outlet 132, a second furnace gas secondary outlet 133, and a second furnace tailings outlet 134. The second furnace material inlet 131 is connected to the first furnace tailings outlet 113. The second furnace gas main outlet 132 is used to output zinc-arsenic gas, and the second furnace gas main outlet 132 is connected to the first furnace gas inlet 112. The second furnace gas secondary outlet 133 is used to output zinc-arsenic gas. The second furnace tailings outlet 134 is used to output solid tailings. The temperature in the second reduction furnace 13 is 1100°C-1200°C, and the reaction time is 1h-2h. The main reaction chemical formula of the material in the second reduction furnace 13 is:

[0052] ZnO+C=Zn(g)+CO(g)

[0053] ZnO+CO (g) = Zn(g)+CO2 (g)

[0054] Among them, s represents solid state and g represents gas state.

[0055] During use, the composite reducing agent equipment for preparing metallic arsenic in the present utility model involves mixing refined white arsenic, zinc powder, and carbon powder and adding them to the first reduction furnace 11 through the first furnace material inlet 111. At a certain temperature, the mixture reacts to produce gaseous elemental arsenic, solid zinc oxide, and carbon dioxide, along with a small amount of zinc arsenate. The first arsenic-containing gas, in addition to gaseous elemental arsenic and carbon dioxide, also contains a small amount of gaseous arsenic trioxide, zinc oxide powder, and carbon powder. The first arsenic-containing gas is output through the first furnace gas outlet 114 and input into the elemental arsenic collection device 12, where solid elemental arsenic can be collected. After the reaction is complete, some carbon powder and a small amount of unreacted solid arsenic trioxide remain in the first reduction furnace 11. The zinc-containing carbon tailings, in addition to zinc oxide and carbon powder, also contain small amounts of solid arsenic trioxide and zinc arsenate.

[0056] The zinc-containing carbon tailings are output through the first furnace tailings outlet 113 and input into the second reduction furnace 13 through the second furnace material inlet 131. At a certain temperature, the zinc oxide and carbon powder in the zinc-containing carbon tailings react to produce gaseous zinc and carbon dioxide, while solid arsenic trioxide becomes gaseous. Zinc arsenate remains solid and is output along with other solid impurities through the second furnace tailings outlet 134. The zinc-containing arsenic gas contains gaseous zinc, carbon dioxide, and a small amount of gaseous arsenic trioxide. Most of the zinc-containing arsenic gas is output through the second furnace main gas outlet 132 and input into the first reduction furnace 11 through the first furnace gas inlet 112. The zinc in the zinc-containing arsenic gas can continue to be used as a reducing agent, recycling the zinc and reducing zinc consumption. The arsenic trioxide in the zinc-containing arsenic gas can also continue to be reduced, saving raw material costs.

[0057] To prevent excessive carbon dioxide concentration in the first reduction furnace 11 from occupying too much space, a small portion of the zinc-arsenic gas can be discharged through the second furnace gas auxiliary outlet 133. Alternatively, when the treatment is completed and the first reduction furnace 11 no longer needs zinc, the zinc-arsenic gas can be completely discharged through the second furnace gas auxiliary outlet 133.

[0058] The elemental arsenic collection device 12 includes a first high-temperature gas-solid separator 121 and a crystallizer 122. The first high-temperature gas-solid separator 121 is provided with a first separator inlet 1211, a first separator gas outlet 1212, and a first separator solid outlet 1213. The first separator inlet 1211 is connected to the first furnace gas outlet 114. The first separator gas outlet 1212 is used to output the second arsenic-containing gas. The first separator solid outlet 1213 is used to output solid impurities. The crystallizer 122 is provided with a tank gas inlet 1221, a tank gas outlet 1222, and a tank solid outlet 1223. The tank gas inlet 1221 is connected to the first separator gas outlet 1212. The tank gas outlet 1222 is used to output the third arsenic-containing gas. The tank solid outlet 1223 is used to output solid elemental arsenic. The temperature of the first high-temperature gas-solid separator 121 can be set to 400°C-500°C, and the temperature of the crystallizer 122 can be set to 400°C-450°C.

[0059] After the first arsenic-containing gas enters the first high-temperature gas-solid separator 121, the elemental arsenic, arsenic trioxide, and carbon dioxide remain in a gaseous state at high temperatures. Solid impurities (solid zinc oxide, dust, zinc powder, and carbon powder) are filtered out of the first arsenic-containing gas by the first high-temperature gas-solid separator 121, resulting in a second arsenic-containing gas containing elemental arsenic, arsenic trioxide, and carbon dioxide, but free of solid impurities. This second arsenic-containing gas is then cooled by a crystallizer 122 at a predetermined temperature, causing most of the elemental arsenic to solidify while the arsenic trioxide and carbon dioxide remain in a gaseous state, allowing the solid elemental arsenic to be collected. The elemental arsenic collected by this structure has a purity of up to 99%.

[0060] The composite reducing agent-based metallic arsenic production equipment also includes a refined white arsenic recovery unit 14, which is connected to the secondary furnace gas outlet 133. Refined white arsenic recovery unit 14 is used to recover refined white arsenic. The zinc-arsenic-containing gas output from the secondary furnace gas outlet 133 still contains gaseous arsenic trioxide. This arsenic trioxide is collected by the refined white arsenic recovery unit 14 to produce refined white arsenic.

[0061] The refined white arsenic recovery unit 14 includes a second high-temperature gas-solid separator 141 and a condensation chamber 142. The second high-temperature gas-solid separator 141 is equipped with a second separator inlet 1411, a second separator gas outlet 1412, and a second separator solids outlet 1413. The second separator inlet 1411 is connected to the second furnace gas auxiliary outlet 133. The second separator solids outlet 1413 is used to discharge solid impurities. The second separator gas outlet 1412 is used to discharge the fourth arsenic-containing gas. The condensation chamber 142 includes a condensation inlet 1421, a condensed solids outlet 1422, and a condensed gas outlet 1423. The condensation inlet 1421 is connected to the second separator gas outlet 1412. The condensed solids outlet 1422 is used to discharge refined white arsenic. The condensed gas outlet 1423 is used to discharge waste gas. The temperature of the second high-temperature gas-solid separator 141 can be set to 400°C-500°C, and the temperature of the condensation chamber 142 can be set to 120°C-300°C.

[0062] After the zinc-arsenic gas enters the second high-temperature gas-solid separator 141, arsenic trioxide and carbon dioxide remain in a gaseous state at high temperature. The solid impurities (solid zinc oxide, dust, liquid zinc containing dust, and carbon powder) in the first arsenic-containing gas can be filtered out through the first high-temperature gas-solid separator 121, and converted into a fourth arsenic-containing gas containing arsenic trioxide and carbon dioxide but without solid impurities. The fourth arsenic-containing gas is then cooled at a certain temperature through the condensation chamber 142, so that most of the arsenic trioxide becomes solid, while the carbon dioxide remains in a gaseous state. High-purity refined white arsenic can be collected and subsequently added to the first reduction furnace 11 to improve resource utilization.

[0063] The tank gas outlet 1222 is connected to the condensation inlet 1421. The third arsenic-containing gas output from the tank gas outlet 1222 still contains a small amount of gaseous arsenic trioxide. By inputting it into the crystallization tank 122 through the condensation inlet 1421, refined white arsenic can be further recovered, thereby improving resource utilization.

[0064] The composite reducing agent preparation equipment for metallic arsenic further includes an exhaust gas purification device 15, the inlet of which is connected to the condensed gas outlet 1423. The exhaust gas purification device 15 can be used to harmlessly treat the exhaust gas output from the condensed gas outlet 1423 to avoid environmental pollution.

[0065] The first reduction furnace 11 is further provided with a first nitrogen inlet 115 for inputting nitrogen to create an oxygen-free atmosphere in the first reduction furnace 11 and prevent the reaction of oxygen and carbon monoxide from causing an explosion. The second reduction furnace 13 is further provided with a second nitrogen inlet 135 for inputting nitrogen to create an oxygen-free atmosphere in the second reduction furnace 13 and prevent the reaction of oxygen and carbon monoxide from causing an explosion.

[0066] The first reduction furnace 11 is a horizontally inclined rotary kiln. The first furnace material inlet 111 and the first furnace gas inlet 112 are located at the higher end of the first reduction furnace 11, while the first furnace tailings outlet 113 and the first furnace gas outlet 114 are located at the lower end of the first reduction furnace 11. This allows the material to slowly move from the higher end of the first reduction furnace 11 to the lower end. During this movement, the material contacts the sidewalls of the first reduction furnace 11, fully absorbing heat and facilitating the smooth discharge of zinc-containing carbon tailings.

[0067] The second reduction furnace 13 is a horizontally inclined rotary kiln. A second furnace material inlet 131 is located at the higher end of the second reduction furnace 13, while a second furnace gas main outlet 132, a second furnace gas auxiliary outlet 133, and a second furnace tailings outlet 134 are located at the lower end of the second reduction furnace 13. This allows the material to slowly move from the higher end of the second reduction furnace 13 to the lower end. During this movement, the material contacts the sidewalls of the second reduction furnace 13, fully absorbing heat and facilitating the smooth discharge of solid tailings.

[0068] The working process of the composite reducing agent preparation metal arsenic equipment of the first preferred embodiment of the utility model is as follows:

[0069] Refined white arsenic, zinc powder, and carbon powder are fed into a first reduction furnace 11. Nitrogen is also introduced into the first reduction furnace 11 to heat the refined white arsenic, zinc powder, and carbon powder at a temperature of 800°C-900°C for 4 hours, generating gaseous elemental arsenic, solid zinc oxide, and carbon dioxide. The first arsenic-containing gas contains not only gaseous elemental arsenic and carbon dioxide, but also small amounts of gaseous arsenic trioxide, zinc oxide powder, and carbon powder. The zinc-containing carbon tailings contain not only zinc oxide and carbon powder, but also small amounts of solid arsenic trioxide and zinc arsenate. The first arsenic-containing gas and zinc-containing carbon tailings are then discharged separately.

[0070] Zinc-containing carbon tailings are fed into the second reduction furnace 13, where nitrogen is introduced to heat the zinc-containing carbon tailings at a temperature of 1100°C-1200°C for 1-2 hours, generating gaseous zinc and carbon dioxide, while solid arsenic trioxide becomes gaseous. The zinc-arsenic gas contains gaseous zinc, carbon dioxide, and a small amount of gaseous arsenic trioxide. The solid tailings contain zinc arsenate and other solid impurities. The zinc-arsenic gas and solid tailings are discharged through the second furnace gas main outlet 132 and the second furnace gas secondary outlet 133, respectively.

[0071] Part of the zinc-arsenic-containing gas is fed into the first reduction furnace 11 so that zinc continues to be used as a reducing agent, thereby allowing zinc to be recycled.

[0072] The first arsenic-containing gas is fed into the first high-temperature gas-solid separator 121, where it undergoes high-temperature filtration. Elemental arsenic, arsenic trioxide, and carbon dioxide remain in a gaseous state at high temperatures. Solid impurities (solid zinc oxide, dust, zinc powder, and carbon powder) are filtered out of the first arsenic-containing gas by the first high-temperature gas-solid separator 121, resulting in a second arsenic-containing gas containing elemental arsenic, arsenic trioxide, and carbon dioxide, but free of solid impurities. The second arsenic-containing gas and solid impurities are then discharged separately.

[0073] The second arsenic-containing gas is fed into the crystallizer 122, which cools the second arsenic-containing gas, causing most of the elemental arsenic to solidify while arsenic trioxide and carbon dioxide remain in gaseous form, forming a third arsenic-containing gas. The third arsenic-containing gas and solid elemental arsenic are then output separately.

[0074] Part of the zinc-arsenic-containing gas is input into the second high-temperature gas-solid separator 141, and the second high-temperature gas-solid separator 141 performs high-temperature filtration on the zinc-arsenic-containing gas, filters out solid impurities (solid zinc oxide, dust, liquid zinc containing dust, and carbon powder) in the zinc-arsenic-containing gas, and converts it into a fourth arsenic-containing gas containing arsenic trioxide and carbon dioxide but without solid impurities, and outputs the solid impurities and the fourth arsenic-containing gas separately.

[0075] The third and fourth arsenic-containing gases are fed into the condensation chamber 142, which cools and condenses them, converting most of the arsenic trioxide into a solid state while the carbon dioxide remains in a gaseous state. Refined white arsenic and waste gas are then output separately.

[0076] This completes the working process of the composite reducing agent preparation metal arsenic equipment of this preferred embodiment.

[0077] Please refer to Figure 2, which is a composite reducing agent preparation metal arsenic equipment provided in the second preferred embodiment of the present invention, and which differs from the first embodiment in that the tank gas outlet 1222 is connected to the first furnace gas inlet 112, and is not connected to the condensation inlet 1421. The third arsenic-containing gas outputted from the tank gas outlet 1222 still contains a small amount of gaseous arsenic trioxide, which is input into the first reduction furnace 11 through the first furnace gas inlet 112, and can continue to be reduced, thereby improving resource utilization. Compared with the first embodiment, the third arsenic-containing gas containing arsenic trioxide is directly introduced into the first reduction furnace 11, which can accelerate the reaction speed, and there is no endothermic process of changing from solid to gas. The other structures of this embodiment are similar to those of the first embodiment and will not be repeated here.

[0078] The composite reducing agent preparation metal arsenic equipment of the utility model uses a second reduction furnace to react zinc oxide and carbon powder to generate gaseous zinc, and the zinc-arsenic gas is input into the first reduction furnace. The zinc in the zinc-arsenic gas can continue to be used as a reducing agent, and the zinc is recycled, thereby reducing the consumption of zinc. The arsenic trioxide in the zinc-arsenic gas can also continue to be reduced, saving the cost of raw materials.

[0079] To sum up, although the present invention has been disclosed as above in terms of preferred embodiments, the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent substitutions or changes based on the concept of the technical solution of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A composite reducing agent for preparing metallic arsenic, which reduces refined white arsenic by zinc powder and carbon powder, characterized in that: The composite reducing agent preparation metal arsenic equipment includes: The first reduction furnace is provided with a first furnace material inlet, a first furnace gas inlet, a first furnace tailings outlet and a first furnace gas outlet; the first furnace material inlet is used to input refined white arsenic, zinc powder and carbon powder; the first furnace tailings outlet is used to output zinc-carbon tailings; the first furnace gas outlet is used to output the first arsenic-containing gas; an elemental arsenic collecting device connected to the first furnace gas outlet, the elemental arsenic collecting device being used to collect solid elemental arsenic; and The second reduction furnace is provided with a second furnace material inlet, a second furnace gas main outlet, a second furnace gas secondary outlet and a second furnace tailings outlet; the second furnace material inlet is connected to the first furnace tailings outlet; the second furnace gas main outlet is used to output zinc-arsenic gas, and the second furnace gas main outlet is connected to the first furnace gas inlet; the second furnace gas secondary outlet is used to output zinc-arsenic gas; the second furnace tailings outlet is used to output solid tailings.

2. The equipment for preparing metallic arsenic using a composite reducing agent according to claim 1, characterized in that: The elemental arsenic collection device comprises: a first high-temperature gas-solid separator, which is provided with a first separator inlet, a first separator gas outlet, and a first separator solid outlet; the first separator inlet is connected to the first furnace gas outlet; the first separator gas outlet is used to output the second arsenic-containing gas; the first separator solid outlet is used to output solid impurities; and, The crystallization tank is provided with a tank gas inlet, a tank gas outlet and a tank solid outlet; the tank gas inlet is connected to the first separator gas outlet; the tank gas outlet is used to output the third arsenic-containing gas; the tank solid outlet is used to output solid elemental arsenic.

3. The equipment for preparing metallic arsenic using a composite reducing agent according to claim 2, characterized in that: The equipment for preparing metallic arsenic using a composite reducing agent further comprises a refined white arsenic recovery device connected to the secondary gas outlet of the second furnace, and the refined white arsenic recovery device is used to recover refined white arsenic.

4. The equipment for preparing metallic arsenic using a composite reducing agent according to claim 3, characterized in that: The refined white arsenic recovery device comprises: a second high-temperature gas-solid separator, which is provided with a second separator inlet, a second separator gas outlet, and a second separator solid outlet; the second separator inlet is connected to the second furnace gas auxiliary outlet; the second separator solid outlet is used to output solid impurities; the second separator gas outlet is used to output a fourth arsenic-containing gas; and, The condensation chamber comprises a condensation inlet, a condensed solid outlet and a condensed gas outlet; the condensation inlet is connected to the gas outlet of the second separator; the condensed solid outlet is used to output refined white arsenic; and the condensed gas outlet is used to output waste gas.

5. The equipment for preparing metallic arsenic using a composite reducing agent according to claim 4, characterized in that: The tank gas outlet is connected to the condensation inlet.

6. The equipment for preparing metallic arsenic using a composite reducing agent according to claim 5, characterized in that: The equipment for preparing metallic arsenic using a composite reducing agent further comprises a tail gas purification device, the inlet of which is connected to the condensed gas outlet.

7. The equipment for preparing metallic arsenic using a composite reducing agent according to claim 2, characterized in that: The tank gas outlet is connected to the first furnace gas inlet.

8. The equipment for preparing metallic arsenic using a composite reducing agent according to claim 1, characterized in that: The first reduction furnace is further provided with a first nitrogen inlet for inputting nitrogen; the second reduction furnace is further provided with a second nitrogen inlet for inputting nitrogen.

9. The equipment for preparing metallic arsenic using a composite reducing agent according to claim 1, characterized in that: The first reduction furnace is a transversely inclined rotary kiln, the first furnace material inlet and the first furnace gas inlet are arranged at the higher end of the first reduction furnace, and the first furnace tailings outlet and the first furnace gas outlet are arranged at the lower end of the first reduction furnace.

10. The equipment for preparing metallic arsenic using a composite reducing agent according to claim 1, characterized in that: The second reduction furnace is a transversely inclined rotary kiln, the second furnace material inlet is arranged at the higher end of the second reduction furnace, and the second furnace gas main outlet, the second furnace gas secondary outlet and the second furnace tail slag outlet are arranged at the lower end of the second reduction furnace.

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