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

An arsenic oxide, all wet process technology, applied in the direction of arsenic oxide/arsenic hydroxide/oxyacid arsenic, arsenic compound, process efficiency improvement, etc. Achieve the effect of enhancing product value, compact process, friendly and safe labor environment

Pending Publication Date: 2020-12-11
龙岩市宇恒环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the arsenic trioxide content obtained in this way reaches more than 99% chemically pure, it still cannot reach more than 99.5% analytically pure, and every cubic arsenic-containing solution can only produce arsenic oxide with an amount of 30-50 kg of arsenic, and the output efficiency is low.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Take 200g of arsenic-containing material (the amount of soot is about 120g), add 1000ml of reduced liquid, oxygen pressure leaching, oxygen pressure temperature 120 ° C, oxygen partial pressure 0.5Mpa, react for 3h, after the leaching is completed, take out the pulp and add 22 grams Arsenic sulfide slag and binder mixture (20 grams of arsenic sulfide slag, 2 grams of limestone), when the temperature drops to 90 ° C, the rotation speed is 131r / min and stirred for 30min, and 1000ml of primary purification solution is obtained by filtration. The composition and content are: As 5+ 120g / L, As 3+ 22g / L, H 2 SO 4 35g / L, SiO 2 0.03%, Ca 2+ 0.04%. Add 3 grams of activated carbon and 1 gram of NaF to the first purification solution, the temperature is about 60 ° C, stir for 30 minutes, cool to room temperature and let stand for 36 hours, filter with precision filter paper to obtain the second purified liquid: As 5+ 120g / L, As 3+ 22g / L, H 2 SO 4 35g / L, SiO 2...

Embodiment 2

[0036] Example 2: Take 100g of arsenic-containing material (the amount of soot is about 60g), add 500ml of reduced liquid, leaching with oxygen pressure, 110 ° C, oxygen partial pressure 0.3Mpa, react for 3h, after leaching is completed, filter to obtain arsenic-containing leaching solution and leaching residue , the leaching solution was added with arsenic sulfide slag to reduce Wujia arsenic to trivalent arsenic at 95 °C, and 45 g of arsenic trioxide crystals were obtained by cooling and crystallization. 2 O 3 The content is 93.8%, and the output arsenic oxide cannot reach qualified analytical purity.

Embodiment 3

[0037] Example 3: Take 1000kg of arsenic-containing material (the amount of soot is about 60kg), add 5m 3 After reduction, oxygen pressure leaching, oxygen pressure temperature 130°C, oxygen partial pressure 0.45Mpa, reaction for 100min, after leaching is completed, take out the pulp and add 120kg (100kg arsenic sulfide slag, 20kg limestone), and stir until the temperature drops to about 90°C 30min, filtered to obtain 5.1m of primary purification solution 3 , the composition and content are: As 5+ 122g / L, As 3+ 21g / L, H 2 SO 4 36g / L, SiO 2 0.04%, Ca 2+ 0.05%. Add 30kg lignite and 10kg NaF to the primary purification solution, stir at 60°C for 30min, cool to room temperature and let stand for 36h, add 20-mesh filter paper and filter to obtain the second purified solution: As 5+ 126g / L, As 3+ 22g / L, H 2 SO 4 36g / L, SiO 2 0.008%, Ca 2+ 0.01%. After the second cleaning, the sulfur dioxide gas was slowly introduced into the liquid, mechanically stirred, the stirring...

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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...

Claims

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Application Information

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IPC IPC(8): C22B30/04C22B7/00C01G28/00
CPCC22B30/04C22B7/007C01G28/005Y02P10/20
Inventor 刘强吴炜聪
Owner 龙岩市宇恒环保科技有限公司
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