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A kind of process of arsenic trioxide melting and electrolysis of elemental arsenic

A technology of arsenic trioxide and molten electrolysis, which is applied in metallurgical technology and environmental protection, can solve problems such as waste of energy and equipment capacity, hidden dangers of operation and production safety, environmental protection pressure, etc., and achieve the effects of saving energy consumption, improving the operating environment, and saving energy

Active Publication Date: 2019-07-30
湖南腾驰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As arsenic oxide volatilizes at low temperature, nearly half of arsenic oxide volatilizes directly into the dust without reduction in traditional arsenic oxide reduction, which seriously wastes energy and equipment capacity. Safety also poses great risks

Method used

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  • A kind of process of arsenic trioxide melting and electrolysis of elemental arsenic

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Effect test

Embodiment 1

[0032] A process for melting and electrolyzing elemental arsenic with diarsenic trioxide, the process includes the following steps:

[0033] (1) Diarsenic trioxide and caustic soda are mixed and melted at a mass ratio of 1:1. The melting temperature is 800°C and the melting time is 40 minutes to obtain molten sodium arsenate. Graphite is used as the electrolytic positive electrode and lead is used as the electrolytic negative electrode. The tank pressure is 8v and the current is Density 20A / dm 2 Electrolysis to obtain elemental arsenic and low-melting-point arsenic alloys. Elemental arsenic is deposited at the bottom of the electrolytic cell in the form of molten arsenic and released from the chute at the bottom of the cell;

[0034] (2) The above-mentioned low-melting-point arsenic alloy is subjected to vacuum distillation, and the conditions for vacuum recovery are: vacuum degree 40Pa, temperature 700°C, steaming for 30min, to obtain elemental arsenic and lead;

[0035] (3)...

Embodiment 2

[0037] A process for melting and electrolyzing elemental arsenic with diarsenic trioxide, the process includes the following steps:

[0038] (1) Diarsenic trioxide and caustic soda are mixed and melted at a mass ratio of 1:1. The melting temperature is 730°C and the time is 50 minutes to obtain molten sodium arsenate. Graphite is used as the electrolytic positive electrode and bismuth is used as the electrolytic negative electrode. The cell pressure is 6v and the current is Density 25A / dm 2 Electrolysis to obtain elemental arsenic and low-melting-point arsenic alloys. Elemental arsenic is deposited at the bottom of the electrolytic cell in the form of molten arsenic and released from the chute at the bottom of the cell;

[0039] (2) The above-mentioned low-melting-point arsenic alloy is subjected to vacuum distillation, and the conditions for vacuum recovery are: vacuum degree 30Pa, temperature 800°C, and steaming for 30 minutes to obtain elemental arsenic and bismuth;

[004...

Embodiment 3

[0042] A process for melting and electrolyzing elemental arsenic with diarsenic trioxide, the process includes the following steps:

[0043] (1) Diarsenic trioxide and caustic soda are mixed and melted at a mass ratio of 1:1. The melting temperature is 900°C and the time is 50 minutes to obtain molten sodium arsenate. Graphite is used as the electrolytic positive electrode and tin is used as the electrolytic negative electrode. The cell pressure is 6v and the current is Density 30A / dm 2 Electrolysis to obtain elemental arsenic and low-melting-point arsenic alloys. Elemental arsenic is deposited at the bottom of the electrolytic cell in the form of molten arsenic and released from the chute at the bottom of the cell;

[0044] (2) The above-mentioned low-melting-point arsenic alloy is subjected to vacuum distillation, and the conditions for vacuum recovery are: vacuum degree 30Pa, temperature 740°C, and steaming for 30 minutes to obtain elemental arsenic and tin;

[0045] (3) T...

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Abstract

The invention belongs to the fields of metallurgy technologies and environmental protection and relates to a technology for producing elementary arsenic from arsenic trioxide through fusion and electrolysis. The technology comprises the following steps: mixing and fusing the arsenic trioxide and caustic soda to obtain fused sodium arsenate, and carrying out electrolysis by using graphite as an electrolysis positive electrode and using metal with a low melting point and a high boiling point as an electrolysis negative electrode to obtain elementary arsenic and arsenic alloy with a low melting point; carrying out vacuum distillation on the arsenic alloy with the low melting point to obtain elementary arsenic and metal melt with a low melting point and a high boiling point; and collecting theelementary arsenic by a condenser, returning the metal melt with the low melting point and the high boiling point and continuously using the metal melt as the negative electrode. The technology can prevent the production of toxic arsenic hydride and at the same time prevent the arsenic from evaporating under the protection of a base covering agent, so that the direct recovery rate of the arsenicis greatly increased. The direct recovery rate of the arsenic is increased from traditional 60% to 95%, energy consumption is saved, and the production rate is increased.

Description

technical field [0001] The invention belongs to the fields of metallurgy technology and environmental protection, and relates to a process for melting and electrolyzing elemental arsenic by diarsenic trioxide. Background technique [0002] In industries such as non-ferrous heavy metals and gold, China produces 100,000 tons of metal arsenic every year. Due to the limited market for arsenic, most companies do not pay attention to the control of arsenic. For a long time, high-arsenic materials have been piled up, and low-arsenic materials It can be made into calcium arsenate calcium ferrite, or it can be landfilled after solidification. With the levy of environmental protection tax, the green and clean disposal of arsenic-containing materials has become a major demand in the corporate market. It can not only eliminate the potential impact of arsenic-containing materials on the environment. It can also replace the traditional solidification landfill, save land resources, make ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/34
CPCC25C3/34
Inventor 陈世民周再明
Owner 湖南腾驰环保科技有限公司
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