A method for harmless treatment of chromium-containing waste coexisting with multiple metals

A harmless treatment and multi-metal technology, applied in the direction of chromium oxide/hydrate, iron oxide, chromium trioxide, etc., can solve the problems of wasting resources, increasing environmental pressure, etc., and achieve the effect of reducing production costs

Active Publication Date: 2015-11-18
青川县天运金属开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment methods of chromium-containing waste include: wet reduction, fire reduction, solidification and landfill, etc., but they are all mainly for chromium, which will cause waste of resources and increase environmental pressure when multiple metals coexist.

Method used

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  • A method for harmless treatment of chromium-containing waste coexisting with multiple metals
  • A method for harmless treatment of chromium-containing waste coexisting with multiple metals
  • A method for harmless treatment of chromium-containing waste coexisting with multiple metals

Examples

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Embodiment

[0020] The flow chart of the harmless treatment method of chromium-containing waste with coexistence of multiple metals is as follows figure 1 As shown, specifically:

[0021] Ingredients for the chromium-containing waste materials HW17, HW21, and HW22 that coexist with polymetallic materials (the ingredients mean that before the raw materials are mixed with water, zero-valent iron and other ingredients are added to the raw materials to meet the requirements of hexavalent chromium and zero-valent iron. Ratio, to facilitate the subsequent process), make hexavalent chromium: zero-valent iron=1:1.5, Fe:Cr=2.5-3.5:1 (the ratio of total iron to total chromium, including hexavalent chromium and zero-valent iron); The mixed slurry is prepared by mixing the mixed chromium-containing waste materials HW17, HW21, HW22 and water at a weight ratio of 1:3-5, and then adding 98% concentrated sulfuric acid to the mixed slurry, and the temperature is controlled <60 ℃, to pH1.0-1.5 of the mixed s...

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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 multi-metal coexisting chromium-containing waste raw material; (2) pulping the prepared material to prepare mixed pulp, and then adding concentrated sulfuric acid into the mixed pulp; (3) adjusting the pH (potential of Hydrogen) to be 3.5-3.8 by using calcium carbonate to produce iron-chromium-alum precipitate, filtering, wherein the content of Fe in the filtrate is 0.05-0.1 g / L, and the content of the Cr in the filtrate is 0.1-0.5 g / L, and finally recovering other metals by using a conventional means; (4) washing the iron-chromium-alum precipitate under the condition of pH of 6-9 to obtain stable iron, chromium and alum, and detecting leaching toxicity to make sure that the leaching toxicity of total chromium is less than 5 mg / L, the leaching toxicity of Cu is less than 10 mg / L, the leaching toxicity of Zn is less than 10 mg / L, and the leaching toxicity of Ni is less than 5mg / L so as to reach the national harmless standard.

Description

Technical field [0001] The invention relates to a method for the harmless treatment and recycling of wastes polluted by multiple metals, in particular to a method for harmless treatment of wastes containing chromium in which multiple metals coexist. Background technique [0002] Existing non-ferrous metal hazardous waste treatment technologies include solidified landfill, dumping into the sea, and incineration. Such technologies have disadvantages such as occupation of arable land, waste of resources, high cost, and potential long-term environmental secondary pollution. The harmless resource treatment technology of non-ferrous metal hazardous waste has always been the focus of research at home and abroad. The existing technologies include fire technology and wet technology. The former has a relatively high cost, and the main process steps of the existing wet technology include: leaching-solid-liquid separation-purification and enrichment-extraction of metals or compounds. Leach...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/36C22B7/00C01G49/06C01G37/033A62D101/43
CPCY02P10/20
Inventor 王修海
Owner 青川县天运金属开发有限公司
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