Equipment for preparing metal arsenic by using arsenic-iron alloy as byproduct

Abstract

The utility model provides metal arsenic preparation equipment with arsenic-iron alloy as a byproduct. The metal arsenic preparation equipment comprises a refined arsenic reduction furnace, a crystallizing tank, a high-temperature melting furnace and a condensing chamber. And the refined white arsenic reduction furnace is provided with a reduction furnace material inlet, a reduction furnace tailing outlet and a reduction furnace gas outlet. The reduction furnace material inlet is used for inputting refined arsenic, iron powder and carbon powder. And the reduction furnace tailing outlet is used for outputting tailings containing iron, carbon and arsenic. The crystallizing 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 reduction furnace gas outlet. The high-temperature melting furnace is provided with a melting furnace material inlet, a melting furnace gas outlet and a melting furnace alloy outlet. The material inlet of the melting furnace is connected to the tailing outlet of the reduction furnace. And the melting furnace gas outlet is used for outputting third arsenic-containing gas. The smelting furnace alloy outlet is used for outputting the arsenic-iron alloy. According to the equipment for preparing the metal arsenic by using the arsenic-iron alloy as the byproduct, not only can elemental arsenic be obtained, but also the arsenic-iron alloy can be obtained, and the return rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of preparing metallic arsenic, in particular to a device for preparing metallic arsenic with arsenic-iron alloy as a by-product. Background Art

[0002] Arsenic has important industrial uses and is widely used in alloy smelting, pesticides, pharmaceuticals, 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, the preparation of arsenic generally adopts the carbothermal reduction method. 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. The two are heated in the reduction furnace to obtain gaseous elemental arsenic, and then collected in a crystallizer to obtain solid elemental arsenic. In order to increase the speed of preparing metallic arsenic, composite reducing agents such as carbon powder and iron powder can be used, but the only valuable product is elemental arsenic, and the rate of return is low.

[0003] Therefore, it is necessary to provide a metal arsenic preparation device with arsenic-iron alloy as a by-product to solve the above technical problems. Utility Model Content

[0004] The utility model provides a metal arsenic preparation device with arsenic-iron alloy as a by-product, which can obtain not only elemental arsenic but also arsenic-iron alloy, thereby improving the rate of return.

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

[0006] A metallic arsenic preparation device with arsenic-iron alloy as a by-product, which processes refined white arsenic with iron powder and carbon powder, comprising:

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

[0008] A 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 reduction furnace gas outlet; the tank gas outlet is used to output the second arsenic-containing gas; the tank solid outlet is used to output solid elemental arsenic;

[0009] A high-temperature melting furnace is provided with a melting furnace material inlet, a melting furnace gas outlet, and a melting furnace alloy outlet; the melting furnace material inlet is connected to the reduction furnace tailings outlet; the melting furnace gas outlet is used to output a third arsenic-containing gas; the melting furnace alloy outlet is used to output arsenic-iron alloy; and,

[0010] The condensation chamber includes a condensation inlet, a condensation solid outlet and a condensation gas outlet; the condensation inlet is connected to both the melting furnace gas outlet and the tank gas outlet; the condensation solid outlet is used to output refined white arsenic; and the condensation gas outlet is used to output waste gas.

[0011] In the metal arsenic preparation equipment whose by-product is arsenic-iron alloy described in the utility model, the metal arsenic preparation equipment whose by-product is arsenic-iron alloy also includes a high-temperature gas-solid separator, which is provided with a separator inlet, a separator gas outlet and a separator solid outlet; the separator inlet is connected to the reduction furnace gas outlet; the separator gas outlet is connected to the tank gas inlet; the separator solid outlet is used to output solid impurities.

[0012] In the metal arsenic preparation equipment whose by-product is arsenic-iron alloy described in the utility model, the metal arsenic preparation equipment whose by-product is arsenic-iron alloy also includes a heat exchanger, which is provided with a heat exchange gas inlet and a heat exchange gas outlet; the heat exchange gas inlet is connected to the melting furnace gas outlet; the heat exchange gas outlet is connected to the condensation inlet.

[0013] In the metal arsenic preparation equipment whose by-product is arsenic-iron alloy described in the utility model, the heat exchanger includes an inner liner and a shell, and the heat exchange gas inlet and the heat exchange gas outlet are respectively arranged at the two ends of the inner liner; the shell is wrapped around the outside of the inner liner, and the two ends of the shell are respectively provided with a cold oil inlet and a hot oil outlet, the cold oil inlet is close to the heat exchange gas outlet, and the cold oil inlet is used to input heat transfer oil, and the hot oil outlet is close to the heat exchange gas inlet, and the hot oil outlet is used to output heat transfer oil.

[0014] In the equipment for preparing metallic arsenic whose by-product is arsenic-iron alloy described in the present invention, the equipment for preparing metallic arsenic whose by-product is arsenic-iron alloy further comprises a tail gas purification device, the inlet of which is connected to the condensed gas outlet.

[0015] In the metal arsenic preparation equipment whose by-product is arsenic-iron alloy described in the utility model, the refined white arsenic reduction furnace is further provided with a reduction furnace nitrogen inlet for inputting nitrogen.

[0016] In the metal arsenic preparation equipment whose by-product is arsenic-iron alloy described in the utility model, the high-temperature melting furnace is further provided with a melting furnace nitrogen inlet for inputting nitrogen.

[0017] In the metal arsenic preparation equipment whose by-product is arsenic-iron alloy described in the utility model, the high-temperature melting furnace is an electrically heated high-temperature melting furnace.

[0018] Another technical solution of the utility model is:

[0019] A metallic arsenic preparation device with arsenic-iron alloy as a by-product, which processes refined white arsenic with iron powder and carbon powder, comprising:

[0020] A refined white arsenic reduction furnace is provided with a reduction furnace material inlet, a reduction furnace gas inlet, a reduction furnace tailings outlet, and a reduction furnace gas outlet; the reduction furnace material inlet is used to input refined white arsenic, iron powder, and carbon powder; the reduction furnace tailings outlet is used to output iron-carbon-arsenic tailings; and the reduction furnace gas outlet is used to output a first arsenic-containing gas;

[0021] A 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 reduction furnace gas outlet; the tank gas outlet is used to output a second arsenic-containing gas, the tank gas outlet is connected to the reduction furnace gas inlet; the tank solid outlet is used to output solid elemental arsenic;

[0022] A high-temperature melting furnace is provided with a melting furnace material inlet, a melting furnace gas outlet, and a melting furnace alloy outlet; the melting furnace material inlet is connected to the reduction furnace tailings outlet; the melting furnace gas outlet is used to output a third arsenic-containing gas; the melting furnace alloy outlet is used to output arsenic-iron alloy; and,

[0023] The condensation chamber comprises a condensation inlet, a condensation solid outlet and a condensation gas outlet; the condensation inlet is connected to the gas outlet of the melting furnace; the condensation solid outlet is used to output refined white arsenic; and the condensation gas outlet is used to output waste gas.

[0024] In the metal arsenic preparation equipment whose by-product is arsenic-iron alloy described in the utility model, the refined white arsenic reduction furnace is also provided with a reduction furnace nitrogen inlet for inputting nitrogen; the high-temperature melting furnace is also provided with a melting furnace nitrogen inlet for inputting nitrogen.

[0025] Compared to the prior art, the present invention offers the following advantages: The present invention provides a metallic arsenic production facility, wherein the byproduct is an arsenic-iron alloy. During operation, iron-carbon-arsenic tailings containing iron, carbon, and arsenic are fed into a high-temperature melting furnace through a melting furnace material inlet. At a certain temperature, ferric arsenate and carbon react to produce ferric arsenide, ferrous oxide, and carbon dioxide. Arsenic trioxide in the iron-carbon-arsenic tailings becomes gaseous. The arsenic-iron alloy is discharged through the melting furnace alloy outlet, and a third arsenic-containing gas is discharged through the melting furnace gas outlet. In addition to carbon dioxide, the third arsenic-containing gas also contains a small amount of gaseous arsenic trioxide. The second and third arsenic-containing gases are fed into a condensation chamber through a condensation inlet. The condensation chamber cools and condenses the second and third arsenic-containing gases, converting the arsenic trioxide to a solid state while the carbon dioxide remains in a gaseous state. Refined white arsenic is discharged through a condensed solid outlet, and exhaust gas containing carbon dioxide is discharged through a condensed gas outlet. Therefore, the metallic arsenic production facility, wherein the byproduct is an arsenic-iron alloy, can produce not only elemental arsenic but also the arsenic-iron alloy, thereby improving the rate of return. Furthermore, the refined white arsenic can be effectively recovered, thereby enhancing resource utilization. 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 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.

[0027] Figure 1 A schematic structural diagram of a metallic arsenic preparation device with arsenic-iron alloy as a by-product provided in the first preferred embodiment of the present invention.

[0028] Figure 2 A schematic structural diagram of a metal arsenic preparation device with arsenic-iron alloy as a by-product provided in the second preferred embodiment of the present invention.

[0029] in, Figure 1 The logo is as follows:

[0030] 11. Refined white arsenic reduction furnace, 111. Reduction furnace material inlet, 112. Reduction furnace tailings outlet, 113. Reduction furnace gas outlet, 114. Reduction furnace nitrogen inlet,

[0031] 12. Crystallization tank, 121. Tank gas inlet, 122. Tank gas outlet, 123. Tank solid outlet,

[0032] 13. High temperature melting furnace, 131. Melting furnace material inlet, 132. Melting furnace gas outlet, 133. Melting furnace alloy outlet, 134. Melting furnace nitrogen inlet,

[0033] 14. Condensation chamber, 141. Condensation inlet, 142. Condensed solid outlet, 143. Condensed gas outlet,

[0034] 15. High-temperature gas-solid separator, 151. Separator inlet, 152. Separator gas outlet, 153. Separator solid outlet,

[0035] 16. Heat exchanger, 161. Heat exchange gas inlet, 162. Heat exchange gas outlet, 163. Inner tank, 164. Shell, 165. Cold oil inlet, 166. Hot oil outlet,

[0036] 17. Exhaust gas purification device.

[0037] Figure 2 The logo is as follows:

[0038] 21. Refined white arsenic reduction furnace, 211. Reduction furnace material inlet, 212. Reduction furnace gas inlet, 213. Reduction furnace tailings outlet, 214. Reduction furnace gas outlet, 215. Reduction furnace nitrogen inlet,

[0039] 22. Crystallization tank, 221. Tank gas inlet, 222. Tank gas outlet, 223. Tank solid outlet,

[0040] 23. High temperature melting furnace, 231. Melting furnace material inlet, 232. Melting furnace gas outlet, 233. Melting furnace alloy outlet, 234. Melting furnace nitrogen inlet,

[0041] 24. Condensation chamber, 241. Condensation inlet, 242. Condensed solid outlet, 243. Condensed gas outlet. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Arsenic has important industrial uses and is widely used in alloy smelting, pesticides, pharmaceuticals, 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, the preparation of arsenic generally adopts the carbothermal reduction method. 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. The two are heated in the reduction furnace to obtain gaseous elemental arsenic, and then collected in a crystallizer to obtain solid elemental arsenic. In order to increase the speed of preparing metallic arsenic, composite reducing agents such as carbon powder and iron powder can be used, but the only valuable product is elemental arsenic, and the rate of return is low.

[0047] The following is a preferred embodiment of the equipment for preparing metallic arsenic whose by-product is arsenic-iron alloy, which is provided by the present invention and can solve the above technical problems.

[0048] Please refer to Figure 1 The first preferred embodiment of the present invention provides a metallic arsenic production system with an arsenic-iron alloy as a byproduct, wherein refined white arsenic is processed using iron powder and carbon powder. The metallic arsenic production system with an arsenic-iron alloy as a byproduct includes a refined white arsenic reduction furnace 11, a crystallization tank 12, a high-temperature melting furnace 13, and a condensation chamber 14.

[0049] The refined white arsenic reduction furnace 11 is equipped with a reduction furnace material inlet 111, a reduction furnace tailings outlet 112, and a reduction furnace gas outlet 113. The reduction furnace material inlet 111 is used to input refined white arsenic, iron powder, and carbon powder. The reduction furnace tailings outlet 112 is used to output iron-carbon-arsenic tailings. The reduction furnace gas outlet 113 is used to output the first arsenic-containing gas. The refined white arsenic reduction furnace 11 is heated to a temperature of 800°C-900°C, and the reaction time is 4 hours. The main chemical reaction formula of the materials in the refined white arsenic reduction furnace 11 is:

[0050] C+4Fe+2As2O3=As4(g)+4FeO+CO2(g)

[0051] C+6FeO+4As2O3=As4(g)+2Fe3(AsO4)2+CO2(g)

[0052] Here, g represents the gaseous state.

[0053] The crystallizer 12 is provided with a tank gas inlet 121, a tank gas outlet 122, and a tank solids outlet 123. The tank gas inlet 121 is connected to the reduction furnace gas outlet 113. The tank gas outlet 122 is used to output the second arsenic-containing gas. The tank solids outlet 123 is used to output solid elemental arsenic. The temperature of the crystallizer 12 can be set to 400°C-450°C.

[0054] The high-temperature melting furnace 13 is equipped with a melting furnace material inlet 131, a melting furnace gas outlet 132, and a melting furnace alloy outlet 133. The melting furnace material inlet 131 is connected to the reduction furnace tailings outlet 112. The melting furnace gas outlet 132 is used to output the third arsenic-containing gas. The melting furnace alloy outlet 133 is used to output the arsenic-iron alloy. The heating temperature of the high-temperature melting furnace 13 is 1100°C-1500°C, and the reaction time is 1 hour-2 hours. The main chemical reaction formula of the material in the high-temperature melting furnace 13 is:

[0055] 3.5C+Fe3(AsO4)2=2FeAs+3.5CO2(g)+FeO

[0056] Here, g represents the gaseous state.

[0057] Condensation chamber 14 includes a condensation inlet 141, a condensed solids outlet 142, and a condensed gas outlet 143. Condensation inlet 141 is connected to both the melting furnace gas outlet 132 and the tank gas outlet 122. Condensed solids outlet 142 is used to discharge refined white arsenic. Condensed gas outlet 143 is used to discharge waste gas. The temperature of condensation chamber 14 can be set between 120°C and 300°C.

[0058] The present invention discloses a metallic arsenic production device that produces an arsenic-iron alloy as a byproduct. During production, refined white arsenic, iron powder, and carbon powder are added to the refined white arsenic reduction furnace 11 through the reduction furnace material inlet 111. At a certain temperature, the arsenic trioxide in the refined white arsenic becomes gaseous and reacts with iron and carbon to produce gaseous elemental arsenic, ferric arsenate, and carbon dioxide. At the end of the reaction, a certain amount of carbon powder remains in the refined white arsenic reduction furnace 11. A first arsenic-containing gas is output through the reduction furnace gas outlet 113, and an iron-carbon-arsenic tailing is output through the reduction furnace tailing outlet 112. In addition to carbon dioxide and gaseous elemental arsenic, the first arsenic-containing gas also contains a small amount of gaseous arsenic trioxide and ferrous oxide powder. The iron-carbon-arsenic tailing contains a small amount of refined white arsenic in addition to carbon powder and ferric arsenate.

[0059] The first arsenic-containing gas is fed into the crystallizer 12 through the tank gas inlet 121. The crystallizer 12 cools the first arsenic-containing gas, causing the elemental arsenic in the first arsenic-containing gas to solidify in the crystallizer 12, while the carbon dioxide and arsenic trioxide in the first arsenic-containing gas remain in a gaseous state. The solid elemental arsenic is discharged through the tank solid outlet 123, and the second arsenic-containing gas, which contains carbon dioxide and arsenic trioxide, is discharged through the tank gas outlet 122.

[0060] Iron-carbon-arsenic tailings are fed into the high-temperature melting furnace 13 through the melting furnace material inlet 131. At a certain temperature, the ferric arsenate and carbon react to produce ferric arsenide, ferrous oxide, and carbon dioxide. Arsenic trioxide in the iron-carbon-arsenic tailings becomes gaseous. Arsenic-iron alloy is discharged through the melting furnace alloy outlet 133, and a third arsenic-containing gas is discharged through the melting furnace gas outlet 132. In addition to carbon dioxide, the third arsenic-containing gas also contains a small amount of gaseous arsenic trioxide.

[0061] The second and third arsenic-containing gases are introduced into condensation chamber 14 through condensation inlet 141. Condensation chamber 14 cools and condenses the second and third arsenic-containing gases, converting arsenic trioxide into a solid state while maintaining the carbon dioxide in a gaseous state. Refined white arsenic is output through condensed solid outlet 142, while exhaust gas containing carbon dioxide is output through condensed gas outlet 143.

[0062] Therefore, by using the metal arsenic preparation equipment with arsenic-iron alloy as a by-product, not only elemental arsenic can be obtained, but also arsenic-iron alloy can be obtained, thereby improving the rate of return. In addition, refined white arsenic can be effectively recovered, thereby improving resource utilization.

[0063] Arsenic-iron alloy is an alloy material with high strength, high rigidity and corrosion resistance, and is widely used in various fields such as steel smelting, aerospace, electronics industry, chemical industry and medicine.

[0064] The metallic arsenic production equipment, which produces ferroarsenic alloy as a byproduct, also includes a high-temperature gas-solid separator 15, which is equipped with a separator inlet 151, a separator gas outlet 152, and a separator solids outlet 153. Separator inlet 151 is connected to the reduction furnace gas outlet 113. Separator gas outlet 152 is connected to the tank gas inlet 121. Separator solids outlet 153 is used to discharge solid impurities. The temperature of the high-temperature gas-solid separator 15 can be set to 400°C-500°C.

[0065] The first arsenic-containing gas is input into the high-temperature gas-solid separator 15 through the separator inlet 151. In the high-temperature gas-solid separator 15, the solid impurities (ferrous oxide and other dust) in the first arsenic-containing gas are filtered out, and the carbon dioxide, elemental arsenic and arsenic trioxide in the first arsenic-containing gas continue to remain in a gaseous state at high temperature. The solid impurities are output through the separator solid outlet 153. The first arsenic-containing gas filtered out of impurities is output through the separator gas outlet 152 and then input into the crystallization tank 12 through the tank gas inlet 121. The first arsenic-containing gas contains carbon dioxide, elemental arsenic and arsenic trioxide. The above structure makes the collected solid elemental arsenic have a purity of up to 99%.

[0066] The metallic arsenic production equipment, which produces an arsenic-iron alloy as a byproduct, further includes a heat exchanger 16, which is provided with a heat exchange gas inlet 161 and a heat exchange gas outlet 162. The heat exchange gas inlet 161 is connected to the melting furnace gas outlet 132. The heat exchange gas outlet 162 is connected to the condenser inlet 141. The third arsenic-containing gas is input into the heat exchanger 16 through the heat exchange gas inlet 161, where it is initially cooled. The cooled third arsenic-containing gas is then output through the heat exchange gas outlet 162 and then input into the condenser chamber 14 through the condenser inlet 141. With this structure, the third arsenic-containing gas is initially cooled and then input into the condenser chamber 14 for secondary cooling. This allows the third arsenic-containing gas to be rapidly cooled to the target temperature in the condenser chamber 14, thereby improving the recovery rate and speed of refined white arsenic. Furthermore, the heat exchanger 16 can effectively recover heat, thereby improving resource utilization.

[0067] Heat exchanger 16 comprises an inner liner 163 and a shell 164. A heat exchange gas inlet 161 and a heat exchange gas outlet 162 are located at opposite ends of inner liner 163. Shell 164 wraps around inner liner 163 and is provided with a cold oil inlet 165 and a hot oil outlet 166 at either end. Cold oil inlet 165 is located near heat exchange gas outlet 162 and is used to input thermal oil. Hot oil outlet 166 is located near heat exchange gas inlet 161 and is used to output thermal oil. This structure ensures that the third arsenic-containing gas and the thermal oil flow in opposite directions, creating countercurrent heat exchange and improving heat exchange efficiency.

[0068] The metal arsenic preparation equipment whose by-product is arsenic-iron alloy further includes an exhaust gas purification device 17, whose inlet is connected to the condensed gas outlet 143. The exhaust gas purification device 17 can be used to perform harmless treatment on the exhaust gas to prevent environmental pollution.

[0069] The refined white arsenic reduction furnace 11 is also provided with a reduction furnace nitrogen inlet 114 for inputting nitrogen. Inputting nitrogen into the refined white arsenic reduction furnace 11 through the reduction furnace nitrogen inlet 114 can make the refined white arsenic reduction furnace 11 close to an oxygen-free atmosphere, preventing carbon monoxide and oxygen from reacting and causing an explosion.

[0070] The high temperature melting furnace 13 is further provided with a melting furnace nitrogen inlet 134 for inputting nitrogen. Inputting nitrogen into the high temperature melting furnace 13 through the melting furnace nitrogen inlet 134 can make the high temperature melting furnace 13 close to an oxygen-free atmosphere, preventing oxygen and carbon from reacting and consuming carbon powder.

[0071] The high-temperature melting furnace 13 is an electrically heated high-temperature melting furnace 13 , which has flexible control, high degree of automation, and is safe and reliable.

[0072] The processing process of the metal arsenic preparation equipment in the first preferred embodiment of the utility model, in which the by-product is arsenic-iron alloy:

[0073] Refined white arsenic, iron powder, and carbon powder are added to a refined white arsenic reduction furnace 11, and nitrogen is introduced into the furnace. The refined white arsenic, iron powder, and carbon powder are heated at a temperature of 800°C-900°C for 4 hours. The refined white arsenic, iron powder, and carbon powder react to produce gaseous elemental arsenic, ferric arsenate, and carbon dioxide, with some residual carbon powder. A first arsenic-containing gas and an iron-containing carbon-arsenic tailing are output separately. In addition to carbon dioxide and gaseous elemental arsenic, the first arsenic-containing gas also contains a small amount of gaseous arsenic trioxide and ferrous oxide powder. The iron-containing carbon-arsenic tailing contains carbon powder, ferric arsenate, and a small amount of refined white arsenic.

[0074] The first arsenic-containing gas is fed into a high-temperature gas-solid separator 15, which can be set to a temperature of 400°C to 500°C. In the high-temperature gas-solid separator 15, solid impurities (ferrous oxide and other dust) are filtered out of the first arsenic-containing gas, while the carbon dioxide, elemental arsenic, and arsenic trioxide in the first arsenic-containing gas remain in a gaseous state at high temperatures. The first arsenic-containing gas containing solid impurities and the first arsenic-containing gas free of solid impurities are then discharged separately. The first arsenic-containing gas contains carbon dioxide, elemental arsenic, and arsenic trioxide.

[0075] A first arsenic-containing gas, free of solid impurities, is fed into crystallizer 12. The temperature of crystallizer 12 can be set between 400°C and 450°C. In crystallizer 12, the elemental arsenic in the first arsenic-containing gas solidifies, while the carbon dioxide and arsenic trioxide in the first arsenic-containing gas remain in a gaseous state. Solid elemental arsenic and a second arsenic-containing gas containing carbon dioxide and arsenic trioxide are then discharged separately.

[0076] The iron-carbon-arsenic tailings are fed into a high-temperature melting furnace 13, where nitrogen is introduced to heat the tailings at a temperature of 1100°C to 1500°C for 1-2 hours. The ferric arsenate and carbon in the tailings react to produce ferric arsenide, ferrous oxide, and carbon dioxide. Arsenic trioxide in the tailings becomes gaseous. Arsenic-iron alloy is discharged through the melting furnace alloy outlet 133, and a third arsenic-containing gas is discharged through the melting furnace gas outlet 132. In addition to carbon dioxide, the third arsenic-containing gas also contains a small amount of gaseous arsenic trioxide.

[0077] The third arsenic-containing gas is input into the heat exchanger 16 , and the heat exchanger 16 cools the third arsenic-containing gas and outputs the cooled third arsenic-containing gas.

[0078] The second arsenic-containing gas and the cooled third arsenic-containing gas are fed into condensation chamber 14, where they are cooled and condensed, converting arsenic trioxide into a solid state while maintaining the carbon dioxide in a gaseous state. Refined white arsenic is discharged through condensed solid outlet 142, while exhaust gas containing carbon dioxide is discharged through condensed gas outlet 143.

[0079] The waste gas is input into the tail gas purification device 17 and discharged after being harmlessly treated.

[0080] This completes the treatment process of the metal arsenic preparation equipment in which the by-product is arsenic-iron alloy in this preferred embodiment.

[0081] A second preferred embodiment of the present invention provides an apparatus for producing metallic arsenic, producing an arsenic-iron alloy as a byproduct. The apparatus processes refined white arsenic using iron powder and carbon powder. The apparatus comprises a refined white arsenic reduction furnace 21, a crystallization tank 22, a high-temperature melting furnace 23, and a condensation chamber 24. The refined white arsenic reduction furnace 21 is provided with a reduction furnace material inlet 211, a reduction furnace gas inlet 212, a reduction furnace tailings outlet 213, and a reduction furnace gas outlet 214. The reduction furnace material inlet 211 is used to input refined white arsenic, iron powder, and carbon powder. The reduction furnace tailings outlet 213 is used to output iron-carbon-arsenic tailings. The reduction furnace gas outlet 214 is used to output a first arsenic-containing gas.

[0082] Crystallization tank 22 is provided with a tank gas inlet 221, a tank gas outlet 222, and a tank solids outlet 223. Tank gas inlet 221 is connected to reduction furnace gas outlet 214. Tank gas outlet 222 is used to output the second arsenic-containing gas and is connected to reduction furnace gas inlet 212. Tank solids outlet 223 is used to output solid elemental arsenic.

[0083] The high-temperature melting furnace 23 is equipped with a melting furnace material inlet 231, a melting furnace gas outlet 232, and a melting furnace alloy outlet 233. The melting furnace material inlet 231 is connected to the reduction furnace tailings outlet 213. The melting furnace gas outlet 232 is used to output the third arsenic-containing gas. The melting furnace alloy outlet 233 is used to output the arsenic-iron alloy.

[0084] The condensation chamber 24 includes a condensation inlet 241, a condensed solids outlet 242, and a condensed gas outlet 243. The condensation inlet 241 is connected to the melting furnace gas outlet 232. The condensed solids outlet 242 is used to output refined white arsenic. The condensed gas outlet 243 is used to output exhaust gas.

[0085] This embodiment differs from the first embodiment in that tank gas outlet 222 is connected to reduction furnace gas inlet 212, rather than being connected to condenser inlet 241 as in the first embodiment. Compared to the first embodiment, tank gas outlet 222 is connected to reduction furnace gas inlet 212, allowing the second arsenic-containing gas containing arsenic trioxide to be introduced directly into the refined white arsenic reduction furnace 21. This accelerates the reaction, as arsenic trioxide does not undergo the heat-absorbing process of transforming from a solid state to a gaseous state.

[0086] The refined white arsenic reduction furnace 21 is also equipped with a reduction furnace nitrogen inlet 215 for supplying nitrogen. Supplying nitrogen into the refined white arsenic reduction furnace 21 through the reduction furnace nitrogen inlet 215 creates an oxygen-free atmosphere in the refined white arsenic reduction furnace 21, preventing carbon monoxide and oxygen from reacting and potentially causing an explosion. The high-temperature melting furnace 23 is also equipped with a melting furnace nitrogen inlet 234 for supplying nitrogen. Supplying nitrogen into the high-temperature melting furnace 23 through the melting furnace nitrogen inlet 234 creates an oxygen-free atmosphere in the high-temperature melting furnace 23, preventing oxygen and carbon from reacting and consuming carbon powder.

[0087] The other structures of this embodiment are the same as those of the first embodiment and will not be described again here.

[0088] The present invention relates to a metallic arsenic production facility whose byproduct is an arsenic-iron alloy. During operation, iron-carbon-arsenic tailings containing arsenic are fed into a high-temperature melting furnace through a melting furnace material inlet. At a certain temperature, ferric arsenate and carbon react to produce ferric arsenide, ferrous oxide, and carbon dioxide. Arsenic trioxide in the iron-carbon-arsenic tailings becomes gaseous. The arsenic-iron alloy is discharged through the melting furnace alloy outlet, and a third arsenic-containing gas is discharged through the melting furnace gas outlet. In addition to carbon dioxide, the third arsenic-containing gas also contains a small amount of gaseous arsenic trioxide. The second and third arsenic-containing gases are fed into a condensation chamber through a condensation inlet. The condensation chamber cools and condenses the second and third arsenic-containing gases, converting the arsenic trioxide to a solid state while the carbon dioxide remains in a gaseous state. Refined white arsenic is discharged through a condensed solid outlet, and exhaust gas containing carbon dioxide is discharged through a condensed gas outlet. Therefore, the metallic arsenic production facility, which produces arsenic-iron alloy as a byproduct, not only produces elemental arsenic but also produces arsenic-iron alloy, improving the rate of return. Furthermore, refined white arsenic can be effectively recovered, thereby enhancing resource utilization.

[0089] 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 device for preparing metallic arsenic with arsenic-iron alloy as a by-product, characterized in that: The treatment of white arsenic by iron powder and carbon powder includes: A refined white arsenic reduction furnace is provided with a reduction furnace material inlet, a reduction furnace tailings outlet, and a reduction furnace gas outlet; the reduction furnace material inlet is used to input refined white arsenic, iron powder, and carbon powder; the reduction furnace tailings outlet is used to output iron-carbon-arsenic tailings; and the reduction furnace gas outlet is used to output a first arsenic-containing gas; A 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 reduction furnace gas outlet; the tank gas outlet is used to output the second arsenic-containing gas; the tank solid outlet is used to output solid elemental arsenic; A high-temperature melting furnace is provided with a melting furnace material inlet, a melting furnace gas outlet, and a melting furnace alloy outlet; the melting furnace material inlet is connected to the reduction furnace tailings outlet; the melting furnace gas outlet is used to output a third arsenic-containing gas; the melting furnace alloy outlet is used to output arsenic-iron alloy; and, The condensation chamber includes a condensation inlet, a condensation solid outlet and a condensation gas outlet; the condensation inlet is connected to both the melting furnace gas outlet and the tank gas outlet; the condensation solid outlet is used to output refined white arsenic; and the condensation gas outlet is used to output waste gas.

2. The equipment for preparing metallic arsenic with arsenic-iron alloy as a by-product according to claim 1, characterized in that: The metallic arsenic preparation equipment whose by-product is arsenic-iron alloy also includes a high-temperature gas-solid separator, which is provided with a separator inlet, a separator gas outlet and a separator solid outlet; the separator inlet is connected to the reduction furnace gas outlet; the separator gas outlet is connected to the tank gas inlet; the separator solid outlet is used to output solid impurities.

3. The equipment for preparing metallic arsenic with arsenic-iron alloy as a by-product according to claim 1, characterized in that: The metal arsenic preparation equipment whose by-product is arsenic-iron alloy also includes a heat exchanger, which is provided with a heat exchange gas inlet and a heat exchange gas outlet; the heat exchange gas inlet is connected to the melting furnace gas outlet; the heat exchange gas outlet is connected to the condensation inlet.

4. The equipment for preparing metallic arsenic with arsenic-iron alloy as a by-product according to claim 3, characterized in that: The heat exchanger includes an inner liner and a shell, and the heat exchange gas inlet and the heat exchange gas outlet are respectively arranged at both ends of the inner liner; the shell is wrapped around the outside of the inner liner, and the two ends of the shell are respectively provided with a cold oil inlet and a hot oil outlet, the cold oil inlet is close to the heat exchange gas outlet, and the cold oil inlet is used to input heat transfer oil, and the hot oil outlet is close to the heat exchange gas inlet, and the hot oil outlet is used to output heat transfer oil.

5. The equipment for preparing metallic arsenic with arsenic-iron alloy as a by-product according to claim 1, characterized in that: The metallic arsenic preparation equipment whose by-product is arsenic-iron alloy further comprises a tail gas purification device, the inlet of which is connected to the condensed gas outlet.

6. The equipment for preparing metallic arsenic with arsenic-iron alloy as a by-product according to claim 1, characterized in that: The refined white arsenic reduction furnace is also provided with a reduction furnace nitrogen inlet for inputting nitrogen.

7. The equipment for preparing metallic arsenic with arsenic-iron alloy as a by-product according to claim 1, characterized in that: The high-temperature melting furnace is also provided with a melting furnace nitrogen inlet for inputting nitrogen.

8. The equipment for preparing metallic arsenic with arsenic-iron alloy as a by-product according to claim 1, characterized in that: The high-temperature melting furnace is an electrically heated high-temperature melting furnace.

9. A device for preparing metallic arsenic with arsenic-iron alloy as a by-product, characterized in that: The treatment of white arsenic by iron powder and carbon powder includes: A refined white arsenic reduction furnace is provided with a reduction furnace material inlet, a reduction furnace gas inlet, a reduction furnace tailings outlet, and a reduction furnace gas outlet; the reduction furnace material inlet is used to input refined white arsenic, iron powder, and carbon powder; the reduction furnace tailings outlet is used to output iron-carbon-arsenic tailings; and the reduction furnace gas outlet is used to output a first arsenic-containing gas; A 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 reduction furnace gas outlet; the tank gas outlet is used to output a second arsenic-containing gas, the tank gas outlet is connected to the reduction furnace gas inlet; the tank solid outlet is used to output solid elemental arsenic; A high-temperature melting furnace is provided with a melting furnace material inlet, a melting furnace gas outlet, and a melting furnace alloy outlet; the melting furnace material inlet is connected to the reduction furnace tailings outlet; the melting furnace gas outlet is used to output a third arsenic-containing gas; the melting furnace alloy outlet is used to output arsenic-iron alloy; and, The condensation chamber comprises a condensation inlet, a condensation solid outlet and a condensation gas outlet; the condensation inlet is connected to the gas outlet of the melting furnace; the condensation solid outlet is used to output refined white arsenic; and the condensation gas outlet is used to output waste gas.

10. The equipment for preparing metallic arsenic with arsenic-iron alloy as a by-product according to claim 9, characterized in that: The refined white arsenic reduction furnace is further provided with a reduction furnace nitrogen inlet for inputting nitrogen; the high-temperature melting furnace is further provided with a melting furnace nitrogen inlet for inputting nitrogen.

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