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Arsenic sulfide slag comprehensive recovering process

A technology of arsenic sulfide and process, which is applied in the direction of sulfur compounds, arsenic compounds, and improvement of process efficiency. It can solve the problems of inability to obtain better comprehensive utilization, difficult disposal of high-arsenic gypsum slag, and unfriendly operating environment, so as to alleviate occupational problems. Effects of safety pressure, avoidance of fugitive emissions, and protection of the environment

Inactive Publication Date: 2020-04-14
湖南腾驰环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a process for the comprehensive recovery of arsenic sulfide slag to solve the problem that the existing industrial pyrolysis treatment process proposed in the above background technology is to directly oxidize and roast arsenic sulfide slag, and its disadvantage is that the operating environment is not friendly. , selenium will also be oxidized and volatilized into the soot, and the volatilization rate of arsenic is low, so it cannot be comprehensively utilized; while the wet process oxygen pressure leaching, the obtained pentavalent arsenic and sulfur dioxide will cause serious expansion of sulfuric acid during the reduction process , a large amount of high-arsenic gypsum slag produced by wastewater treatment is difficult to dispose of, and it is easy to cause secondary pollution

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  • Arsenic sulfide slag comprehensive recovering process

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Effect test

Embodiment 1

[0028] The arsenic sulfide slag is used as the raw material for distillation treatment. The distillation process is as follows: the reducing agent is pulverized coal, the addition amount is 4% of the material amount of the arsenic sulfide slag, nitrogen is used as the protective gas, the temperature is 850 ℃, and the distillation is carried out for 5 hours. A mixed gas of arsenic sulfide and sulfur dioxide and a distillation residue are obtained. The distillation rate of arsenic sulfide is 92.8%, the distillation residue rate is 12.5%, and the enrichment of lead, copper, rhenium, bismuth and selenium is 8.12 times. The copper rhenium was leached from the distillation residue under neutral oxygen pressure. The leaching process was as follows: the leaching temperature was 150 °C, the oxygen pressure was 1.0 MPa, the liquid-solid ratio was 7:1, the stirring rate was 600 r / min, the reaction was 3 hours, and the copper rhenium leaching rate was 98.6%. , the leaching rate of rhenium...

Embodiment 2

[0030] The arsenic sulfide slag is used as the raw material for distillation treatment. The distillation process is as follows: the reducing agent is pulverized coal, the addition amount is 3% of the material amount of the arsenic sulfide slag, nitrogen is used as the protective gas, the temperature is 900 ℃, and the distillation is carried out for 3 hours. A mixed gas of arsenic sulfide and sulfur dioxide and a distillation residue are obtained. The distillation rate of arsenic sulfide is 91.2%, the distillation residue rate is 15.4%, and the enrichment of lead, copper, rhenium, bismuth and selenium is 6.49 times. The copper rhenium was leached from the distillation slag under neutral oxygen pressure. The leaching process was as follows: the leaching temperature was 100 °C, the oxygen pressure was 0.5 MPa, the liquid-solid ratio was 6:1, the stirring rate was 800 r / min, the reaction was 4 h, and the copper rhenium leaching rate was 96.8%. , the leaching rate of rhenium is 97....

Embodiment 3

[0032] The arsenic sulfide slag is used as the raw material for distillation treatment. The distillation process is as follows: the reducing agent is pulverized coal, the addition amount is 5% of the material amount of the arsenic sulfide slag, nitrogen is used as the protective gas, the temperature is 750 ℃, and the distillation is carried out for 5 hours. A mixed gas of arsenic sulfide and sulfur dioxide and a distillation residue are obtained. The distillation rate of arsenic sulfide is 87.5%, the distillation slag rate is 22.6%, and the enrichment of lead, copper, rhenium, bismuth and selenium is 4.42 times. The copper rhenium was leached from the distillation residue under neutral oxygen pressure. The leaching process was as follows: the leaching temperature was 100°C, the oxygen pressure was 0.8MPa, the liquid-solid ratio was 8:1, the stirring rate was 600r / min, the reaction was 4h, and the copper leaching rate was 98.7%. The leaching rate of rhenium was 98.8%, and lead,...

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Abstract

The invention discloses an arsenic sulfide slag comprehensive recovering process. The recovering process comprises the following steps: (1) reductive distillation: arsenic sulfide slag and a reducingagent are mixed in protective gas for selective distillation to obtain mixed gas, the mixed gas is oxidized by air to generate arsenic oxide and sulfur dioxide, arsenic oxide is obtained by condensation, and sulfur dioxide is made into acid to obtain sulfuric acid products; (2) oxygen pressure leaching: distillation residues are subjected to oxygen pressure leaching, valuable metals such as copperand rhenium are selectively leached, rhenium is extracted and recovered from a leach solution, raffinate is subjected to electrowinning or evaporation, electric copper or copper sulfate is produced,leach residues contain lead, bismuth and selenium, and lead residues after alkaline leaching and selenium recovery are used as a lead recovery raw material. The process has the beneficial effects thatarsenic sulfide is directly distilled out in a reducing atmosphere in the arsenic sulfide distillation stage, volatilization waste of valuable metals due to oxidation roasting is avoided, arsenic andsulfur are effectively recovered, and valuable metals such as lead, copper, rhenium, bismuth and selenium are enriched.

Description

technical field [0001] The invention relates to the field of environmental protection treatment and metallurgy technology, in particular to a process for comprehensive recovery of arsenic sulfide slag. Background technique [0002] my country is a country with large arsenic resources. According to statistics, my country's cumulative proven arsenic resources reserves are 3.977 million tons, accounting for 70% of the world's total reserves. It exists in the form of arsenate minerals, sulfides, sulfur arsenides, etc. With the rapid development of my country's economy, the demand for resources is increasing day by day, the consumption of high-quality mineral resources is almost exhausted, the taste is low, the gangue minerals are many, the occurrence state is complex, and some refractory ores containing arsenic have become major It is an important source of raw materials for mineral processing and smelting plants. In the process of beneficiation, due to technical and technologic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B61/00C22B13/00C22B30/04C01G28/00C01B17/69C01B17/50
CPCC01B17/501C01B17/69C01G28/005C22B7/001C22B7/006C22B13/00C22B15/0063C22B15/0065C22B30/04C22B61/00Y02P10/20
Inventor 陈世民周再明
Owner 湖南腾驰环保科技有限公司
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