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

Abstract

The invention provides a method for preparing metal arsenic by using arsenic-iron alloy as a byproduct, which comprises the following steps: S11, obtaining refined arsenic, iron powder and carbon powder by a refined arsenic reduction furnace, heating the refined arsenic, the iron powder and the carbon powder, and respectively outputting first arsenic-containing gas and iron-containing carbon-arsenic tailings; s12, the crystallizing tank obtains first arsenic-containing gas, the first arsenic-containing gas is cooled, and second arsenic-containing gas and solid simple substance arsenic are output respectively; s13, iron-containing carbon-arsenic tailings are obtained through the high-temperature melting furnace, the iron-containing carbon-arsenic tailings are heated, and third arsenic-containing gas and arsenic-iron alloy are output; and S14, the condensation chamber obtains second arsenic-containing gas and third arsenic-containing gas, the second arsenic-containing gas and the third arsenic-containing gas are cooled and condensed, and refined arsenic and waste gas are output respectively. According to the method for preparing the metal arsenic with the arsenic-iron alloy as the byproduct, the elemental arsenic can be obtained, the arsenic-iron alloy can also be obtained, and the return rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of preparing metallic arsenic, and in particular to a method for preparing metallic arsenic with arsenic-iron alloy as a byproduct. Background Art

[0002] Arsenic has important uses in industry 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, which 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 elemental arsenic, and then collected by 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 method for preparing metallic arsenic with arsenic-iron alloy as a by-product to solve the above technical problems. Summary of the invention

[0004] The invention provides a method for preparing metallic arsenic 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 present invention is:

[0006] A method for preparing metallic arsenic with arsenic-iron alloy as a byproduct, using a metallic arsenic preparation device with arsenic-iron alloy as a byproduct for treatment, reducing refined white arsenic by iron powder and carbon powder, wherein the metallic arsenic preparation device with arsenic-iron alloy as a byproduct comprises:

[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; 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] A condensation chamber, comprising 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; the condensation gas outlet is used to output waste gas;

[0011] The method for preparing metallic arsenic wherein the byproduct is arsenic-iron alloy comprises the following steps:

[0012] S11, the refined white arsenic reduction furnace obtains refined white arsenic, iron powder and carbon powder, and inputs them into the refined white arsenic reduction furnace through the reduction furnace material inlet, heats the refined white arsenic, iron powder and carbon powder, outputs the first arsenic-containing gas through the reduction furnace gas outlet, and outputs the iron-carbon-arsenic tailings through the reduction furnace tailings outlet;

[0013] S12, the crystallization tank obtains the first arsenic-containing gas and inputs it into the crystallization tank through the tank gas inlet, the crystallization tank cools down the first arsenic-containing gas, outputs the second arsenic-containing gas through the tank gas outlet; and outputs solid elemental arsenic through the tank solid outlet;

[0014] S13, the high-temperature melting furnace obtains iron-carbon-arsenic tailings, and inputs them into the high-temperature melting furnace through the melting furnace material inlet, heats the iron-carbon-arsenic tailings, outputs a third arsenic-containing gas through the melting furnace gas outlet, and outputs arsenic-iron alloy through the melting furnace alloy outlet; and,

[0015] S14, the condensation chamber obtains the second arsenic-containing gas and the third arsenic-containing gas, and inputs them into the condensation chamber through the condensation inlet, the condensation chamber cools down and condenses the second arsenic-containing gas and the third arsenic-containing gas, outputs refined white arsenic through the condensed solid outlet, and outputs waste gas through the condensed gas outlet.

[0016] In the method for preparing metallic arsenic with arsenic-iron alloy as a byproduct of the present invention, in step S11, the refined white arsenic, iron powder and carbon powder added to the refined white arsenic reduction furnace through the material inlet of the reduction furnace are as follows: As 2 O 3 :C:Fe=100:45:30.

[0017] In the method for preparing metallic arsenic with arsenic-iron alloy as the by-product described in the present invention, in step S11, the temperature for heating the refined white arsenic, iron powder and carbon powder is 800° C.-900° C., and the reaction time is 4 hours.

[0018] In the method for preparing metallic arsenic with arsenic-iron alloy as the by-product described in the present invention, in step S13, the temperature for heating the iron-carbon-arsenic tailings is 1100° C.-1500° C., and the reaction time is 1 h-2 h.

[0019] In the method for preparing metallic arsenic with arsenic-iron alloy as a byproduct described in the present invention, the equipment for preparing metallic arsenic with arsenic-iron alloy as a byproduct further comprises 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;

[0020] The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct further comprises step S15, the high-temperature gas-solid separator obtains a first arsenic-containing gas, and inputs the first arsenic-containing gas into the high-temperature gas-solid separator through the separator inlet, the high-temperature gas-solid separator performs high-temperature filtration on the first arsenic-containing gas, outputs the first arsenic-containing gas with solid impurities filtered out through the separator gas outlet, and outputs the solid impurities through the separator solid outlet; the step S15 is located before the step S12;

[0021] In the step S12, the first arsenic-containing gas from which solid impurities are filtered out is obtained for the crystallization tank.

[0022] In the method for preparing metallic arsenic with arsenic-iron alloy as a byproduct of the present invention, the equipment for preparing metallic arsenic with arsenic-iron alloy as a byproduct further comprises 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;

[0023] The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct further comprises step S16, the heat exchanger obtains a third arsenic-containing gas and inputs it into the heat exchanger through the heat exchange gas inlet, the heat exchanger cools the third arsenic-containing gas, and outputs the cooled third arsenic-containing gas through the heat exchange gas outlet; step S16 is before step S14;

[0024] In the step S14, the third arsenic-containing gas after cooling is obtained for the condensation chamber.

[0025] In the method for preparing metallic arsenic whose byproduct is arsenic-iron alloy described in the present invention, in the equipment for preparing metallic arsenic whose product is arsenic-iron alloy, the refined white arsenic reduction furnace is further provided with a reduction furnace nitrogen inlet for inputting nitrogen;

[0026] The step S11 also includes that the refined white arsenic reduction furnace obtains nitrogen and inputs the nitrogen into the refined white arsenic reduction furnace through the nitrogen inlet of the reduction furnace.

[0027] In the method for preparing metallic arsenic whose byproduct is arsenic-iron alloy described in the present invention, in the equipment for preparing metallic arsenic whose product is arsenic-iron alloy, the high-temperature melting furnace is also provided with a melting furnace nitrogen inlet for inputting nitrogen;

[0028] The step S13 also includes that the high-temperature melting furnace obtains nitrogen and inputs the nitrogen into the high-temperature melting furnace through the nitrogen inlet of the melting furnace.

[0029] Another technical solution of the present invention is:

[0030] A method for preparing metallic arsenic with arsenic-iron alloy as a byproduct, using a metallic arsenic preparation device with arsenic-iron alloy as a byproduct for treatment, reducing refined white arsenic by iron powder and carbon powder, wherein the metallic arsenic preparation device with arsenic-iron alloy as a byproduct comprises:

[0031] 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; the reduction furnace gas outlet is used to output a first arsenic-containing gas;

[0032] 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;

[0033] 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,

[0034] A condensation chamber, comprising a condensation inlet, a condensation solid outlet and a condensation gas outlet; the condensation inlet is connected to the melting furnace gas outlet; the condensation solid outlet is used to output refined white arsenic; the condensation gas outlet is used to output waste gas;

[0035] The method for preparing metallic arsenic wherein the byproduct is arsenic-iron alloy comprises the following steps:

[0036] S21, the refined white arsenic reduction furnace obtains refined white arsenic, iron powder and carbon powder, and inputs them into the refined white arsenic reduction furnace through the reduction furnace material inlet, heats the refined white arsenic, iron powder and carbon powder, outputs the first arsenic-containing gas through the reduction furnace gas outlet, and outputs the iron-carbon-arsenic tailings through the reduction furnace tailings outlet;

[0037] S22, the crystallization tank obtains the first arsenic-containing gas and inputs it into the crystallization tank through the tank gas inlet, the crystallization tank cools down the first arsenic-containing gas, outputs the second arsenic-containing gas through the tank gas outlet; outputs solid elemental arsenic through the tank solid outlet; and,

[0038] S23, the high-temperature melting furnace obtains iron-carbon-arsenic tailings, and inputs them into the high-temperature melting furnace through the melting furnace material inlet, heats the iron-carbon-arsenic tailings, outputs a third arsenic-containing gas through the melting furnace gas outlet, and outputs arsenic-iron alloy through the melting furnace alloy outlet; and,

[0039] S24, the condensation chamber obtains a third arsenic-containing gas and inputs it into the condensation chamber through the condensation inlet, the condensation chamber cools and condenses the third arsenic-containing gas, outputs refined white arsenic through the condensed solid outlet, and outputs waste gas through the condensed gas outlet;

[0040] Wherein, the step S21 further includes obtaining a second arsenic-containing gas and inputting the second arsenic-containing gas into the refined white arsenic reduction furnace through the reduction furnace gas inlet.

[0041] In the method for preparing metallic arsenic whose byproduct is arsenic-iron alloy described in the present invention, in the equipment for preparing metallic arsenic whose product is arsenic-iron alloy, 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;

[0042] The step S21 also includes that the refined white arsenic reduction furnace obtains nitrogen and inputs it into the refined white arsenic reduction furnace through the nitrogen inlet of the reduction furnace; the step S23 also includes that the high-temperature melting furnace obtains nitrogen and inputs it into the high-temperature melting furnace through the nitrogen inlet of the melting furnace.

[0043] Compared with the prior art, the present invention has the following beneficial effects: the method for preparing metallic arsenic with arsenic-iron alloy as a byproduct of the present invention, the iron-carbon-arsenic tailings are input into a high-temperature melting furnace through the material inlet of the melting furnace. At a certain temperature, ferric arsenate and carbon react to generate ferrous arsenide, ferrous oxide and carbon dioxide. Arsenic trioxide in the iron-carbon-arsenic tailings becomes gaseous. Arsenic-iron alloy is output through the alloy outlet of the melting furnace, and the third arsenic-containing gas is output through the gas outlet of the melting furnace. The second arsenic-containing gas and the third arsenic-containing gas are input into the condensation chamber through the condensation inlet, and the condensation chamber cools and condenses the second arsenic-containing gas and the third arsenic-containing gas, and arsenic trioxide becomes solid, and carbon dioxide continues to remain in the gaseous state. Refined white arsenic is output through the condensed solid outlet, and waste gas is output through the condensed gas outlet, and the waste gas contains carbon dioxide. Therefore, the method for preparing metallic arsenic with arsenic-iron alloy as a byproduct can not only obtain elemental arsenic, but also obtain arsenic-iron alloy, thereby improving the rate of return, and can also effectively recover refined white arsenic, thereby improving resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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.

[0045] Figure 1 A schematic diagram of the main process of a method for preparing metallic arsenic with arsenic-iron alloy as a by-product provided in a first preferred embodiment of the present invention.

[0046] Figure 2 A schematic structural diagram of a metallic arsenic preparation device used in a method for preparing metallic arsenic with arsenic-iron alloy as a by-product provided in a first preferred embodiment of the present invention.

[0047] Figure 3 A schematic structural diagram of a metallic arsenic preparation device used in a method for preparing metallic arsenic with arsenic-iron alloy as a by-product provided in a second preferred embodiment of the present invention.

[0048] in, Figure 2 The logo is as follows:

[0049] 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,

[0050] 12. Crystallization tank, 121. Tank gas inlet, 122. Tank gas outlet, 123. Tank solid outlet,

[0051] 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,

[0052] 14. Condensation chamber, 141. Condensation inlet, 142. Condensation solid outlet, 143. Condensation gas outlet,

[0053] 15. High temperature gas-solid separator, 151. Separator inlet, 152. Separator gas outlet, 153. Separator solid outlet,

[0054] 16. heat exchanger, 161. heat exchange gas inlet, 162. heat exchange gas outlet.

[0055] Figure 3 The logo is as follows:

[0056] 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,

[0057] 22. Crystallization tank, 221. Tank gas inlet, 222. Tank gas outlet, 223. Tank solid outlet,

[0058] 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,

[0059] 24. Condensation chamber, 241. Condensation inlet, 242. Condensation solid outlet, 243. Condensation gas outlet. DETAILED DESCRIPTION

[0060] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0061] The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only for reference to the orientation of the drawings. The directional terms used are used to illustrate and understand the present invention, but not to limit the present invention.

[0062] The terms "first", "second", etc. in the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and should not be used as a limitation on the order of precedence.

[0063] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] Arsenic has important uses in industry 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, which 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 elemental arsenic, and then collected by 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.

[0065] The following is a preferred embodiment of a method for preparing metallic arsenic with arsenic-iron alloy as a byproduct, which can solve the above technical problems, provided by the present invention.

[0066] Please refer to Figure 1 and Figure 2 The preferred embodiment of the present invention provides a method for preparing metallic arsenic with arsenic-iron alloy as a byproduct, which is treated by using a metallic arsenic preparation device with arsenic-iron alloy as a byproduct, and reducing the refined white arsenic by iron powder and carbon powder. The metallic arsenic preparation device with 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.

[0067] The refined white arsenic reduction furnace 11 is provided 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 main chemical reaction formula of the material in the refined white arsenic reduction furnace 11 is:

[0068] C+4Fe+2As 2 O 3 =As 4 (g)+4FeO+CO 2 (g)

[0069] C+6FeO+4As 2 O 3 =As 4 (g)+2Fe 3 (AsO 4 ) 2 +CO 2 (g)

[0070] Here, g represents the gas state.

[0071] The crystallization tank 12 is provided with a tank gas inlet 121, a tank gas outlet 122 and a tank solid 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 solid outlet 123 is used to output solid elemental arsenic. The temperature of the crystallization tank 12 can be set to 400°C-450°C.

[0072] The high temperature melting furnace 13 is provided 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 arsenic-iron alloy. The main chemical reaction formula of the material in the high temperature melting furnace 13 is:

[0073] 3.5C+Fe3 (AsO 4 ) 2 =2FeAs+3.5CO 2 (g)+FeO

[0074] Here, g represents the gas state.

[0075] The condensation chamber 14 includes a condensation inlet 141, a condensation solid outlet 142 and a condensation gas outlet 143. The condensation inlet 141 is connected to both the melting furnace gas outlet 132 and the tank gas outlet 122. The condensation solid outlet 142 is used to output refined white arsenic. The condensation gas outlet 143 is used to output waste gas. The temperature of the condensation chamber 14 can be set to 120°C-300°C.

[0076] The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct comprises the following steps:

[0077] S11, the refined white arsenic reduction furnace 11 obtains refined white arsenic, iron powder and carbon powder, and inputs them into the refined white arsenic reduction furnace 11 through the reduction furnace material inlet 111, heats the refined white arsenic, iron powder and carbon powder, outputs the first arsenic-containing gas through the reduction furnace gas outlet 113, and outputs the iron-carbon-arsenic tailings through the reduction furnace tailings outlet 112;

[0078] S12, the crystallization tank 12 obtains the first arsenic-containing gas, and inputs it into the crystallization tank 12 through the tank gas inlet 121, the crystallization tank 12 cools the first arsenic-containing gas, outputs the second arsenic-containing gas through the tank gas outlet 122; and outputs solid elemental arsenic through the tank solid outlet 123;

[0079] S13, the high temperature melting furnace 13 obtains iron-carbon-arsenic tailings, and inputs them into the high temperature melting furnace 13 through the melting furnace material inlet 131, heats the iron-carbon-arsenic tailings, outputs the third arsenic-containing gas through the melting furnace gas outlet 132, and outputs arsenic-iron alloy through the melting furnace alloy outlet 133; and,

[0080] S14, the condensation chamber 14 obtains the second arsenic-containing gas and the third arsenic-containing gas, and inputs them into the condensation chamber 14 through the condensation inlet 141. The condensation chamber 14 cools and condenses the second arsenic-containing gas and the third arsenic-containing gas, outputs refined white arsenic through the condensation solid outlet 142, and outputs waste gas through the condensation gas outlet 143.

[0081] The method for preparing metallic arsenic in which the by-product of the present invention is an arsenic-iron alloy, wherein 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, and at a certain temperature, arsenic trioxide reacts with iron and carbon to generate gaseous elemental arsenic, ferric arsenate and carbon dioxide. At the end of the reaction, a certain amount of carbon powder will remain in the refined white arsenic reduction furnace 11. The first arsenic-containing gas is output through the reduction furnace gas outlet 113, and the iron-carbon arsenic tailings are output through the reduction furnace tailings 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. In addition to carbon powder and ferric arsenate, the iron-carbon arsenic tailings also contain a small amount of refined white arsenic.

[0082] The first arsenic-containing gas is input into the crystallization tank 12 through the tank gas inlet 121, and the crystallization tank 12 cools the first arsenic-containing gas. The elemental arsenic in the first arsenic-containing gas becomes solid in the crystallization tank 12, and the carbon dioxide and arsenic trioxide in the first arsenic-containing gas continue to remain in the gaseous state. The solid elemental arsenic is output through the tank solid outlet 123, and the second arsenic-containing gas is output through the tank gas outlet 122. The second arsenic-containing gas contains carbon dioxide and arsenic trioxide.

[0083] The iron-carbon-arsenic tailings are fed into the high-temperature melting furnace 13 through the melting furnace material inlet 131. At a certain temperature, ferric arsenate and carbon react to generate ferric arsenide, ferrous oxide and carbon dioxide. Arsenic trioxide in the iron-carbon-arsenic tailings becomes gaseous. Arsenic-iron alloy is output through the melting furnace alloy outlet 133, and the third arsenic-containing gas is output 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.

[0084] The second arsenic-containing gas and the third arsenic-containing gas are input into the condensation chamber 14 through the condensation inlet 141. The condensation chamber 14 cools and condenses the second arsenic-containing gas and the third arsenic-containing gas, and arsenic trioxide becomes solid, while carbon dioxide continues to remain in gaseous state. Refined white arsenic is output through the condensed solid outlet 142, and waste gas is output through the condensed gas outlet 143, and the waste gas contains carbon dioxide.

[0085] Therefore, the method for preparing metallic arsenic with arsenic-iron alloy as a by-product can not only obtain elemental arsenic, but also obtain arsenic-iron alloy, thereby improving the rate of return. In addition, refined white arsenic can be effectively recovered, thereby improving resource utilization.

[0086] Arsenic-iron alloy is an alloy material with high strength, high rigidity and corrosion resistance, which is widely used in various fields such as steel smelting, aerospace, electronics industry, chemical industry and medicine.

[0087] In step S11, the refined white arsenic, iron powder and carbon powder are added into the refined white arsenic reduction furnace 11 through the reduction furnace material inlet 111, and the mass ratio of As 2 O3 :C:Fe=100:45:30. This ratio can ensure that the iron in the refined white arsenic reduction furnace 11 just meets the requirements for arsenic trioxide reduction, and the amount of carbon, in addition to meeting the requirements for arsenic trioxide reduction, the remaining amount just meets the requirements for the ferric arsenate reaction in the high-temperature melting furnace 13.

[0088] In step S11, the temperature for heating the refined white arsenic, iron powder and carbon powder is 800°C-900°C, and the reaction time is 4 hours, so that the materials in the refined white arsenic reduction furnace 11 can react fully.

[0089] In step S13, the temperature for heating the iron-carbon-arsenic tailings is 1100°C-1500°C, and the reaction time is 1h-2h, so that the materials in the high-temperature melting furnace 13 can react fully.

[0090] The metal arsenic preparation equipment with arsenic-iron alloy as a byproduct also includes a high-temperature gas-solid separator 15, which is provided with a separator inlet 151, a separator gas outlet 152 and a separator solid outlet 153. The separator inlet 151 is connected to the reduction furnace gas outlet 113. The separator gas outlet 152 is connected to the tank gas inlet 121. The separator solid outlet 153 is used to output solid impurities.

[0091] The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct further includes step S15, the high-temperature gas-solid separator 15 obtains the first arsenic-containing gas, and inputs it into the high-temperature gas-solid separator 15 through the separator inlet 151, the high-temperature gas-solid separator 15 performs high-temperature filtration on the first arsenic-containing gas, outputs the first arsenic-containing gas filtered out of solid impurities through the separator gas outlet 152, and outputs the solid impurities through the separator solid outlet 153. Step S15 is located before step S12. In step S12, the first arsenic-containing gas filtered out of solid impurities is obtained for the crystallization tank 12.

[0092] The first arsenic-containing gas is input into the high-temperature gas-solid separator 15 through the separator inlet 151, in which 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 crystallizer 12 through the tank gas inlet 121. The first arsenic-containing gas contains carbon dioxide, elemental arsenic and arsenic trioxide. The above structure makes it possible for the solid elemental arsenic collected by the crystallizer 12 to have a purity of up to 99%.

[0093] The metal arsenic preparation equipment with arsenic-iron alloy as a byproduct further comprises 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 condensation inlet 141 .

[0094] The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct further includes step S16, the heat exchanger 16 obtains the third arsenic-containing gas, and inputs it into the heat exchanger 16 through the heat exchange gas inlet 161, the heat exchanger 16 cools the third arsenic-containing gas, and outputs the cooled third arsenic-containing gas through the heat exchange gas outlet 162. Step S16 is located before step S14. In step S14, the cooled third arsenic-containing gas is obtained for the condensation chamber 14.

[0095] The third arsenic-containing gas is input into the heat exchanger 16 through the heat exchange gas inlet 161, the third arsenic-containing gas is initially cooled, the cooled third arsenic-containing gas is output through the heat exchange gas outlet 162, and then input into the condensation chamber 14 through the condensation inlet 141. Through the above structure, the third arsenic-containing gas is initially cooled and then input into the condensation chamber 14 for secondary cooling, so that the third arsenic-containing gas can be quickly cooled to the target temperature in the condensation chamber 14 to improve the recovery rate and recovery speed of refined white arsenic. In addition, heat can also be effectively recovered through the heat exchanger 16 to improve resource utilization.

[0096] In the equipment for preparing metallic arsenic whose product is arsenic-iron alloy, the refined white arsenic reduction furnace 11 is also provided with a reduction furnace nitrogen inlet 114 for inputting nitrogen. Step S11 also includes that the refined white arsenic reduction furnace 11 obtains nitrogen and inputs it into the refined white arsenic reduction furnace 11 through the reduction furnace nitrogen inlet 114, so that the refined white arsenic reduction furnace 11 can be close to an oxygen-free atmosphere to prevent carbon monoxide and oxygen from reacting and causing an explosion.

[0097] In the metal arsenic preparation device whose product is arsenic-iron alloy, the high temperature melting furnace 13 is also provided with a melting furnace nitrogen inlet 134 for inputting nitrogen. Step S13 also includes that the high temperature melting furnace 13 obtains nitrogen and inputs it into the high temperature melting furnace 13 through the melting furnace nitrogen inlet 134. The high temperature melting furnace 13 can be made close to an oxygen-free atmosphere to prevent oxygen and carbon from reacting and consuming carbon powder.

[0098] The method for preparing metallic arsenic in which the byproduct is arsenic-iron alloy in the first preferred embodiment of the present invention:

[0099] Add refined white arsenic, iron powder and carbon powder to the refined white arsenic reduction furnace 11, input nitrogen into the refined white arsenic reduction furnace 11, heat the refined white arsenic, iron powder and carbon powder, the heating temperature is 800℃-900℃, and the reaction time is 4h. Refined white arsenic, iron powder and carbon powder react to generate gaseous elemental arsenic, ferric arsenate and carbon dioxide, and a portion of carbon powder will remain, and the first arsenic-containing gas and iron-containing carbon arsenic tailings are output respectively. 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. In addition to carbon powder and ferric arsenate, the iron-containing carbon arsenic tailings also contain a small amount of refined white arsenic.

[0100] The first arsenic-containing gas is input into the high-temperature gas-solid separator 15, and the temperature of the high-temperature gas-solid separator 15 can be set to 400° C.-500° C. In the high-temperature gas-solid separator 15, solid impurities (ferrous oxide and other dust) in the first arsenic-containing gas are filtered out, and carbon dioxide, elemental arsenic and arsenic trioxide in the first arsenic-containing gas continue to remain in a gaseous state at high temperature. The first arsenic-containing gas containing solid impurities and the first arsenic-containing gas without solid impurities are output respectively, and the first arsenic-containing gas contains carbon dioxide, elemental arsenic and arsenic trioxide.

[0101] The first arsenic-containing gas without solid impurities is input into the crystallization tank 12, and the temperature of the crystallization tank 12 can be set to 400°C-450°C. In the crystallization tank 12, the elemental arsenic in the first arsenic-containing gas becomes solid, and the carbon dioxide and arsenic trioxide in the first arsenic-containing gas continue to remain in the gaseous state. The solid elemental arsenic and the second arsenic-containing gas are output respectively. The second arsenic-containing gas contains carbon dioxide and arsenic trioxide.

[0102] The iron-carbon-arsenic tailings are input into the high-temperature melting furnace 13, and nitrogen is input into the high-temperature melting furnace 13 to heat the iron-carbon-arsenic tailings. The heating temperature is 1100°C-1500°C, and the reaction time is 1h-2h. The arsenic acid iron and carbon in the iron-carbon-arsenic tailings react to produce ferric arsenide, ferrous oxide and carbon dioxide. Arsenic trioxide in the iron-carbon-arsenic tailings becomes gaseous. Arsenic-iron alloy is output through the melting furnace alloy outlet 133, and the third arsenic-containing gas is output 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.

[0103] 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.

[0104] The second arsenic-containing gas and the third arsenic-containing gas after cooling are input into the condensation chamber 14, and the condensation chamber 14 cools and condenses the second arsenic-containing gas and the third arsenic-containing gas after cooling, and arsenic trioxide becomes solid, and carbon dioxide continues to remain in gaseous state. Refined white arsenic is output through the condensed solid outlet 142, and waste gas is output through the condensed gas outlet 143, and the waste gas contains carbon dioxide.

[0105] This is the method for preparing metallic arsenic in which the by-product is arsenic-iron alloy according to the preferred embodiment.

[0106] Please refer to Figure 3 A second preferred embodiment of the present invention provides a method for preparing metallic arsenic whose by-product is arsenic-iron alloy, which is processed by using a metallic arsenic preparation device whose by-product is arsenic-iron alloy, and the refined white arsenic is reduced by iron powder and carbon powder. The metallic arsenic preparation device whose by-product is arsenic-iron alloy includes a refined white arsenic reduction furnace 21, a crystallization tank 22, a high-temperature melting furnace 23 and a condensation chamber 24.

[0107] 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 the first arsenic-containing gas.

[0108] The crystallization tank 22 is provided with a tank gas inlet 221, a tank gas outlet 222 and a tank solid outlet 223. The tank gas inlet 221 is connected to the reduction furnace gas outlet 214. The tank gas outlet 222 is used to output the second arsenic-containing gas, and the tank gas outlet 222 is connected to the reduction furnace gas inlet 212. The tank solid outlet 223 is used to output solid elemental arsenic.

[0109] The high temperature melting furnace 23 is provided 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 arsenic-iron alloy.

[0110] The condensation chamber 24 includes a condensation inlet 241, a condensation solid outlet 242 and a condensation gas outlet 243. The condensation inlet 241 is connected to the melting furnace gas outlet 232. The condensation solid outlet 242 is used to output refined white arsenic. The condensation gas outlet 243 is used to output waste gas.

[0111] The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct comprises the following steps:

[0112] S21, the refined white arsenic reduction furnace 21 obtains refined white arsenic, iron powder and carbon powder, and inputs them into the refined white arsenic reduction furnace 21 through the reduction furnace material inlet 211, heats the refined white arsenic, iron powder and carbon powder, outputs the first arsenic-containing gas through the reduction furnace gas outlet 214, and outputs the iron-carbon-arsenic tailings through the reduction furnace tailings outlet 213;

[0113] S22, the crystallization tank 22 obtains the first arsenic-containing gas, and inputs it into the crystallization tank 22 through the tank gas inlet 221, the crystallization tank 22 cools the first arsenic-containing gas, and outputs the second arsenic-containing gas through the tank gas outlet 222; and outputs the solid elemental arsenic through the tank solid outlet 223;

[0114] S23, the high temperature melting furnace 23 obtains iron-carbon-arsenic tailings, and inputs them into the high temperature melting furnace 23 through the melting furnace material inlet 231, heats the iron-carbon-arsenic tailings, outputs the third arsenic-containing gas through the melting furnace gas outlet 232, and outputs arsenic-iron alloy through the melting furnace alloy outlet 233; and,

[0115] S24, the condensation chamber 24 obtains the third arsenic-containing gas and inputs it into the condensation chamber 24 through the condensation inlet 241, the condensation chamber 24 cools down and condenses the third arsenic-containing gas, outputs refined white arsenic through the condensed solid outlet 242, and outputs waste gas through the condensed gas outlet 243;

[0116] Wherein, step S21 also includes obtaining a second arsenic-containing gas and inputting it into the refined white arsenic reduction furnace 21 through the reduction furnace gas inlet 212 .

[0117] The difference between this embodiment and the first embodiment is that the second arsenic-containing gas is input into the refined white arsenic reduction furnace 21 through the reduction furnace gas inlet 212, instead of the first embodiment where the second arsenic-containing gas is input into the condensation chamber 24 through the condensation inlet 241. The second arsenic-containing gas containing arsenic trioxide is directly introduced into the refined white arsenic reduction furnace 21, and arsenic trioxide does not absorb heat and changes from solid to gaseous state, which can accelerate the reaction speed.

[0118] In the metal arsenic preparation equipment whose product is arsenic-iron alloy, the refined white arsenic reduction furnace 21 is also provided with a reduction furnace nitrogen inlet 215 for inputting nitrogen. The high-temperature melting furnace 23 is also provided with a melting furnace nitrogen inlet 234 for inputting nitrogen.

[0119] Step S21 also includes that the refined white arsenic reduction furnace 21 obtains nitrogen and inputs it into the refined white arsenic reduction furnace 21 through the reduction furnace nitrogen inlet 215, so that the refined white arsenic reduction furnace 21 is close to an oxygen-free atmosphere to prevent carbon monoxide and oxygen from reacting and causing an explosion.

[0120] Step S23 also includes that the high temperature melting furnace 23 obtains nitrogen and inputs it into the high temperature melting furnace 23 through the melting furnace nitrogen inlet 234, which can make the high temperature melting furnace 23 close to an oxygen-free atmosphere to prevent oxygen and carbon from reacting and consuming carbon powder.

[0121] The method for preparing metallic arsenic with an arsenic-iron alloy as a byproduct of the present invention is to input the iron-carbon-arsenic tailings into a high-temperature melting furnace through the material inlet of the melting furnace. At a certain temperature, ferric arsenate and carbon react to generate ferric arsenide, ferrous oxide and carbon dioxide. Arsenic trioxide in the iron-carbon-arsenic tailings becomes gaseous. Arsenic-iron alloy is output through the alloy outlet of the melting furnace, and a third arsenic-containing gas is output through the gas outlet of the melting furnace. The second arsenic-containing gas and the third arsenic-containing gas are input into the condensation chamber through the condensation inlet, and the condensation chamber cools and condenses the second arsenic-containing gas and the third arsenic-containing gas, and arsenic trioxide becomes solid, and carbon dioxide continues to remain in a gaseous state. Refined white arsenic is output through the condensed solid outlet, and waste gas is output through the condensed gas outlet, and the waste gas contains carbon dioxide. Therefore, the method for preparing metallic arsenic with an arsenic-iron alloy as a byproduct can not only obtain elemental arsenic, but also obtain arsenic-iron alloy, thereby improving the rate of return, and can also effectively recover refined white arsenic, thereby improving resource utilization.

[0122] To sum up, although the present invention has been disclosed as above in the form of preferred embodiments, the protection scope of the present invention is not limited thereto, and any technician familiar with the technical field can make equivalent substitutions or changes according to the concept of the technical solution of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing metallic arsenic with arsenic-iron alloy as a by-product, characterized in that: The metal arsenic preparation equipment whose byproduct is arsenic-iron alloy is used for treatment, and the refined white arsenic is reduced by iron powder and carbon powder. The metal arsenic preparation equipment whose byproduct is arsenic-iron alloy 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; 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, A condensation chamber, comprising 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; the condensation gas outlet is used to output waste gas; The method for preparing metallic arsenic wherein the byproduct is arsenic-iron alloy comprises the following steps: S11, the refined white arsenic reduction furnace obtains refined white arsenic, iron powder and carbon powder, and inputs them into the refined white arsenic reduction furnace through the reduction furnace material inlet, heats the refined white arsenic, iron powder and carbon powder, outputs the first arsenic-containing gas through the reduction furnace gas outlet, and outputs the iron-carbon-arsenic tailings through the reduction furnace tailings outlet; S12, the crystallization tank obtains the first arsenic-containing gas and inputs it into the crystallization tank through the tank gas inlet, the crystallization tank cools down the first arsenic-containing gas, outputs the second arsenic-containing gas through the tank gas outlet; and outputs solid elemental arsenic through the tank solid outlet; S13, the high-temperature melting furnace obtains iron-carbon-arsenic tailings, and inputs them into the high-temperature melting furnace through the melting furnace material inlet, heats the iron-carbon-arsenic tailings, outputs a third arsenic-containing gas through the melting furnace gas outlet, and outputs arsenic-iron alloy through the melting furnace alloy outlet; and, S14, the condensation chamber obtains the second arsenic-containing gas and the third arsenic-containing gas, and inputs them into the condensation chamber through the condensation inlet, the condensation chamber cools down and condenses the second arsenic-containing gas and the third arsenic-containing gas, outputs refined white arsenic through the condensed solid outlet, and outputs waste gas through the condensed gas outlet.

2. The method for preparing metallic arsenic wherein the byproduct is arsenic-iron alloy according to claim 1, characterized in that: In the step S11, the refined white arsenic, iron powder and carbon powder are added into the refined white arsenic reduction furnace through the reduction furnace material inlet, in a mass ratio of As2O3:C:Fe=100:45:

30.

3. The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct according to claim 1, characterized in that: In the step S11, the temperature for heating the refined white arsenic, iron powder and carbon powder is 800° C.-900° C., and the reaction time is 4 hours.

4. The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct according to claim 1, characterized in that: In the step S13, the temperature for heating the iron-carbon-arsenic tailings is 1100° C.-1500° C., and the reaction time is 1 h-2 h.

5. The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct according to claim 1, characterized in that: The metal arsenic preparation equipment whose byproduct 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; The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct further comprises step S15, the high-temperature gas-solid separator obtains a first arsenic-containing gas, and inputs the first arsenic-containing gas into the high-temperature gas-solid separator through the separator inlet, the high-temperature gas-solid separator performs high-temperature filtration on the first arsenic-containing gas, outputs the first arsenic-containing gas with solid impurities filtered out through the separator gas outlet, and outputs the solid impurities through the separator solid outlet; the step S15 is located before the step S12; In the step S12, the first arsenic-containing gas from which solid impurities are filtered out is obtained for the crystallization tank.

6. The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct according to claim 1, characterized in that: The metal arsenic preparation equipment whose byproduct is arsenic-iron alloy further comprises 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; The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct further comprises step S16, the heat exchanger obtains a third arsenic-containing gas and inputs it into the heat exchanger through the heat exchange gas inlet, the heat exchanger cools the third arsenic-containing gas, and outputs the cooled third arsenic-containing gas through the heat exchange gas outlet; step S16 is before step S14; In the step S14, the third arsenic-containing gas after cooling is obtained for the condensation chamber.

7. The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct according to claim 1, characterized in that: In the metal arsenic preparation equipment whose product is arsenic-iron alloy, the refined white arsenic reduction furnace is also provided with a reduction furnace nitrogen inlet for inputting nitrogen; The step S11 also includes that the refined white arsenic reduction furnace obtains nitrogen and inputs the nitrogen into the refined white arsenic reduction furnace through the nitrogen inlet of the reduction furnace.

8. The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct according to claim 1, characterized in that: In the metal arsenic preparation equipment whose product is arsenic-iron alloy, the high-temperature melting furnace is also provided with a melting furnace nitrogen inlet for inputting nitrogen; The step S13 also includes that the high-temperature melting furnace obtains nitrogen and inputs the nitrogen into the high-temperature melting furnace through the nitrogen inlet of the melting furnace.

9. A method for preparing metallic arsenic with arsenic-iron alloy as a by-product, characterized in that: The metal arsenic preparation equipment whose byproduct is arsenic-iron alloy is used for treatment, and the refined white arsenic is reduced by iron powder and carbon powder. The metal arsenic preparation equipment whose byproduct is arsenic-iron alloy 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; 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, A condensation chamber, comprising a condensation inlet, a condensation solid outlet and a condensation gas outlet; the condensation inlet is connected to the melting furnace gas outlet; the condensation solid outlet is used to output refined white arsenic; the condensation gas outlet is used to output waste gas; The method for preparing metallic arsenic wherein the byproduct is arsenic-iron alloy comprises the following steps: S21, the refined white arsenic reduction furnace obtains refined white arsenic, iron powder and carbon powder, and inputs them into the refined white arsenic reduction furnace through the reduction furnace material inlet, heats the refined white arsenic, iron powder and carbon powder, outputs the first arsenic-containing gas through the reduction furnace gas outlet, and outputs the iron-carbon-arsenic tailings through the reduction furnace tailings outlet; S22, the crystallization tank obtains the first arsenic-containing gas and inputs it into the crystallization tank through the tank gas inlet, the crystallization tank cools down the first arsenic-containing gas, outputs the second arsenic-containing gas through the tank gas outlet; outputs solid elemental arsenic through the tank solid outlet; and, S23, the high-temperature melting furnace obtains iron-carbon-arsenic tailings, and inputs them into the high-temperature melting furnace through the melting furnace material inlet, heats the iron-carbon-arsenic tailings, outputs a third arsenic-containing gas through the melting furnace gas outlet, and outputs arsenic-iron alloy through the melting furnace alloy outlet; and, S24, the condensation chamber obtains a third arsenic-containing gas and inputs it into the condensation chamber through the condensation inlet, the condensation chamber cools and condenses the third arsenic-containing gas, outputs refined white arsenic through the condensed solid outlet, and outputs waste gas through the condensed gas outlet; Wherein, the step S21 further includes obtaining a second arsenic-containing gas and inputting the second arsenic-containing gas into the refined white arsenic reduction furnace through the reduction furnace gas inlet.

10. The method for preparing metallic arsenic with arsenic-iron alloy as a byproduct according to claim 9, characterized in that: In the metal arsenic preparation equipment whose product is arsenic-iron alloy, 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; The step S21 also includes that the refined white arsenic reduction furnace obtains nitrogen and inputs it into the refined white arsenic reduction furnace through the nitrogen inlet of the reduction furnace; the step S23 also includes that the high-temperature melting furnace obtains nitrogen and inputs it into the high-temperature melting furnace through the nitrogen inlet of the melting furnace.

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