A method for harmless treatment of arsenic-containing waste with coexistence of multiple metals

A harmless treatment, multi-metal technology, applied in the direction of process efficiency improvement, etc., can solve the problems of failing to meet the national harmless standard, unable to recycle valuable metals, etc., and achieve the effect of simple process

Active Publication Date: 2015-11-11
青川县天运金属开发有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, the existing methods all have the risk of being unable to recover its valuable metals or failing to meet the national harmless standards after recovering valuable metals, and producing arsine and chlorine gas during the operation process.

Method used

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  • A method for harmless treatment of arsenic-containing waste with coexistence of multiple metals
  • A method for harmless treatment of arsenic-containing waste with coexistence of multiple metals
  • A method for harmless treatment of arsenic-containing waste with coexistence of multiple metals

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Embodiment

[0023] The flow chart of the harmless treatment method for arsenic-containing waste coexisting with multiple metals is as follows figure 1 As shown, specifically:

[0024] A method for harmless treatment of arsenic-containing waste coexisting with multiple metals comprises the following steps:

[0025] (1) Add Fe salt to HW48, HW24, and HW17 arsenic-containing wastes so that Fe:As=3-4:1 in the arsenic-containing wastes; Mix parts by weight to prepare a mixed slurry, then add sodium hydroxide to the mixed slurry, add sodium hypochlorite when the pH of the mixed slurry is greater than or equal to 13, and stop adding sodium hypochlorite until the pH value of the mixed slurry is recovered and maintained at a pH greater than or equal to 13; dilute Sulfuric acid is prepared by 1 part 98% sulfuric acid and 2 parts water.

[0026] (2) When the pH value of the mixed slurry is re-stabilized at pH ≥ 13, adjust the mixed slurry with dilute sulfuric acid to make the mixed slurry pH 6-8, ...

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Abstract

The invention discloses a harmless treatment method for multi-metal coexisting chromium-containing waste. The harmless treatment method comprises the following steps: (1) preparing the material and pulping to obtain mixed pulp, then adding sodium hydroxide into the mixed pulp and then adding sodium hypochlorite; (2) mixing the mixed pulp by using dilute sulfuric acid to keep the pH (potential of Hydrogen) at 6-8 and keeping for 1 hour at 40-60 DEG C; (3) continuously acidifying the mixed pulp with the dilute sulfuric acid until the pH is 1.0-1.5, adjusting Fe+As in the mixed pulp to be less than 10 g / L, then adjusting the pH of the mixed pulp to be 3.0-3.8 by using the calcium carbonate to obtain alkaline ferric arsenate, filtering, wherein the content of As in the filtrate is less than 5 mg / L, and finally recovering other metals by using a conventional means; (4) washing and filtering the alkaline ferric arsenate under the condition of pH of 6-9 to make sure that the leaching toxicity of As is less than 5 mg / L so as to reach the national harmless standard.

Description

technical field [0001] The invention relates to a method for harmless recycling of polymetallic-polluted waste, in particular to a method for harmless treatment of arsenic-containing waste where multi-metal coexists. Background technique [0002] The existing non-ferrous metal hazardous waste treatment technologies include solidification landfill, throwing into the sea, incineration and other technologies. These technologies have disadvantages such as occupying cultivated land, wasting resources, high cost, and potential long-term secondary environmental pollution. The harmless resource treatment technology of non-ferrous metal hazardous waste has always been the focus of research at home and abroad. There are two types of fire technology and wet technology in the prior art. The cost of the former is relatively high, and the main process steps of the existing wet technology include: leaching-solid-liquid separation-purification and enrichment-extraction of metals or compoun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/44
CPCY02P10/20
Inventor 王修海
Owner 青川县天运金属开发有限公司
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