Method for extracting arsenic metal from arsenic trioxide material by two-stage carbon reduction

A technology for arsenic trioxide and metal extraction, applied in the field of metallurgy, can solve the problems of uncontinuous process, single reduction zone, limited processing capacity, etc., and achieve the effects of improving reduction rate, processing capacity and output

Inactive Publication Date: 2011-10-12
YUNNAN TIN GROUP HLDG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common features of the above-mentioned methods are: reduction reaction occurs in a closed container, and the process is intermittently fed and discharged, that is, the process cannot be continuous, and the processing capacity is limited. If you want to expand production, you can only rely on increasing reduction. Only tanks are required, and the single reduction zone will easily le...

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  • Method for extracting arsenic metal from arsenic trioxide material by two-stage carbon reduction
  • Method for extracting arsenic metal from arsenic trioxide material by two-stage carbon reduction
  • Method for extracting arsenic metal from arsenic trioxide material by two-stage carbon reduction

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Embodiment 1

[0029] With arsenic ash as raw material 100.0kg, see Table 1 for specific components, 18.1 kg of carbonaceous primary reducing agent with coke, see Table 2 for specific components, and use cylindrical charcoal (commercially available) as secondary reducing agent, in the ball making machine After pressing the arsenic ash into Φ10mm pellets under pressure, put the arsenic ash and coke in the top hopper of a 100kVA DC submerged arc furnace, and seal the raw material hopper to prevent air from entering. Charcoal is filled in the carbothermal reduction area outside the furnace, and the charcoal hopper is sealed. After checking whether the seals of the metal arsenic vapor condensation and sedimentation chamber are well sealed, turn on the fan exhaust system and control the system pressure at 0-20Pa. When the reduction temperature inside the furnace is 1000°C and the reduction temperature outside the furnace is 800°C, feed materials for carbon thermal reduction. reaction. A part of ...

Embodiment 2

[0035]The raw materials and process are the same as in Example 1, except that the pressure of the control system is 5-20 Pa. When the reduction temperature inside the furnace is 1100°C and the reduction temperature outside the furnace is 900°C for carbothermal reduction reaction, the temperature of the condensation and sedimentation chamber is controlled at Block metal arsenic can be obtained at 340°C. After the reduction is complete, close the flue gas valve on the furnace top, open the bypass valve, and let the unreduced flue gas directly enter the condensation and settling barrel; at the same time, close the front valve of the metal arsenic condensation chamber, open the door of the settling chamber, and take the material to obtain 41.7kg block As for metal arsenic, the reduction rate of metal arsenic is calculated to be 71.1%, and the average purity of the metal arsenic reaches 99.22%.

Embodiment 3

[0037] The raw materials and process are the same as in Example 1, the difference is that the pressure of the control system is 5-15 Pa, when the reduction temperature inside the furnace is 1300°C, and the reduction temperature outside the furnace is 1000°C for carbothermal reduction reaction, the temperature of the condensation and sedimentation chamber is controlled at Block metal arsenic can be obtained at 360°C. After the reduction is completed, close the flue gas valve on the top of the furnace, open the bypass valve, and let the unreduced flue gas directly enter the condensation and settling barrel; at the same time, close the front valve of the metal arsenic condensation chamber, open the door of the settling chamber, and take the material to obtain 44.0kg block As for metal arsenic, the reduction rate of metal arsenic is calculated to be 75.0%, and the average purity of the metal arsenic reaches 99.58%.

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Abstract

The invention relates to a method for extracting arsenic metal from arsenic ash by carbon thermal reduction outside a direct current furnace, belonging to the technical field of metallurgy. In the method, arsenic ash or arsenic trioxide is used as a raw material, and nut coke is used as a reducer, wherein the mol ratio of the raw material to the reducer is 1.0:(3.0-5.0). The method comprises the following steps: carrying out first-stage carbon thermal reduction in a closed direct current furnace at 800-1300 DEG C under a pressure of 0-20Pa, thus generating arsenic metal vapor and other flue gas through reduction; introducing the generated arsenic metal vapor and other flue gas into a reduction device which is filled with charcoal and arranged outside the furnace, and carrying out second-stage carbon thermal reduction at 800-1000 DEG C under a pressure of 0-20Pa; and introducing the arsenic metal vapor generated through two-stage reduction into a arsenic metal condensing and settling chamber to obtain arsenic metal blocks, and condensing and settling the arsenic trioxide which is not fully reduced in a settling vat. The method provided by the invention causes less environment pollution, does little harm to the health of operating personnel, and can realize the continuous production in the technical process; and the total reduction rate and purity of the arsenic metal are high.

Description

technical field [0001] The invention relates to a method for extracting metallic arsenic from arsenic ash by carbothermal reduction outside a DC furnace, belonging to the technical field of metallurgy. Background technique [0002] At present, the production techniques of metal arsenic (99% purity) at home and abroad mainly include hydrogen reduction method and carbon reduction method. [0003] The hydrogen reduction method uses arsenous acid (a saturated aqueous solution of arsenic trioxide) as the raw material and heats them together under high temperature conditions (about 800°C) to finally obtain the reduced product metallic arsenic. The main features of this process are: the product of hydrogen reduction is arsine, and arsine can be completely decomposed into metal arsenic under high temperature conditions, so that the metal arsenic product can be better separated from other impurities, and the quality of the obtained product is relatively high. Better (the purity reac...

Claims

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Application Information

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IPC IPC(8): C22B30/04C22B5/10
Inventor 王炜袁海滨陈学元朱华明尹久发杨铣张启旺
Owner YUNNAN TIN GROUP HLDG
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