Process for producing qualified arsenic oxide from arsenic-containing material by full-wet method

Abstract

The invention discloses a process for producing qualified arsenic oxide from an arsenic-containing material by a full-wet method. The process comprises the following steps that pressurizing, heating,oxidizing and leaching are carried out on the arsenic-containing material, a mixture of arsenic sulfide and an adhesive is added into arsenic-containing low-acid leached ore pulp for purifying, solid-liquid separation is carried out, an adsorbent and a calcium remover are added into the solution, cooling is carried out to normal temperature, standing and aging are carried out for 24-48 hours, andprecisely filtering is carried out; and sulfur dioxide is introduced into purified liquid, arsenic pentoxide is reduced and crystallized to obtain arsenic trioxide, and air drying and dehydration arecarried out to obtain qualified analytically pure arsenic trioxide products. The process has compact flow and full-wet method closed cycle operation, and has the advantages of work environment friendliness, safety and the like, the qualified arsenic trioxide products are produced at a time, the problem of arsenic open circuit is solved, productization of arsenic is achieved, the product value is greatly improved, and the process has good advantages in arsenic-containing material treatment and recovery.

Description

technical field

[0001] The invention relates to the fields of environmental protection management and comprehensive utilization of valuable elements in hazardous solid waste, and in particular to a process for producing qualified arsenic oxide by a full-wet method of arsenic-containing materials. Background technique

[0002] In the non-ferrous smelting process of heavy metals such as copper, lead, zinc, tin, antimony, and bismuth, arsenic mainly enters the flue gas through steam. In the follow-up flue gas treatment, arsenic enters the smoke dust and dirty acid slag. How to remove arsenic efficiently, cleanly and safely to prepare arsenic products is not only possible Solving the safety and environmental protection problems of arsenic can also increase the value of arsenic and obtain good economic and environmental benefits.

[0003] At present, the solidification treatment technologies commonly used in domestic treatment of arsenic-containing waste residue and sludge are ce...

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