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Chromium slag treatment process

A treatment process and technology for chromium slag, applied in sustainable waste treatment, chromium compounds, solid waste management, etc., can solve the problems of large amount of reducing agent ferrous sulfate, acid can not be recycled, pollution, etc., to achieve low cost, reduce The effect of water consumption and simple equipment

Pending Publication Date: 2021-04-27
山东同其信息科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

Wet treatment of chromium slag requires a large amount of acid and ferrous sulfate reducing agent in the wet method. The acid used in production is a dangerous process, and the acid cannot be recycled. The amount of reducing agent ferrous sulfate is large, which is likely to bring new pollution

Method used

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  • Chromium slag treatment process

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example 1

[0021] Example 1: A kind of chromium slag treatment process

[0022] Specific steps are as follows:

[0023] Treatment of the first batch of chrome slag

[0024] 1.1 1T chromium slag (hexavalent chromium 1656mg / L), after crushing, add 5T water, temperature 70℃, stir for 4 hours, filter (press filter), 1.3T filter cake, 4.7T dark yellow filtrate (hexavalent chromium 256mg / L) ) Add sodium bisulfite to reduce to dark green, adjust pH7, produce chromium hydroxide precipitation, after filtration, the filter cake is gray chromium hydroxide, the pH of the filtrate is adjusted to neutral, and the second batch of materials is extracted for four-stage extraction as extract use;

[0025] 1.2 1.3T filter cake (255mg / L of hexavalent chromium) continued secondary extraction, add 5T of water, temperature 70℃, stir for 4 hours, filter (press filter), 1.1T filter cake, 5.1T filtrate (hexavalent chromium 51mg / L) L) for the first-level extraction of the second batch of materials as an extract...

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Abstract

The invention relates to a chromium slag treatment process, which comprises the following steps: carrying out primary extraction, secondary extraction, tertiary extraction and quaternary extraction on chromium slag, and then enabling the filtrate of each stage of extraction to enter the next batch of chromium slag treatment process for reuse, wherein most chromium is dissociated from the chromium slag in an aqueous solution, so that the chromium content in the chromium slag is reduced; and after multi-stage water extraction, cooling filtrate to room temperature to separate out dichromate, filtering, adding sodium hydrogen sulfite for reduction, precipitating chromium hydroxide, and continuously extracting the next batch of chromium slag by taking liquid after solid-liquid separation as circulating water. According to the method, water is used as a solvent, multi-stage extraction is carried out, filtrate can be reused in batches, the water consumption is reduced, the detoxified chromium slag can be buried and used as a road repairing material for manufacturing building materials, dichromate and chromium hydroxide can be reused as industrial raw materials.

Description

technical field [0001] The invention relates to a process for treating chromium slag, in particular to a high-efficiency circulating water washing process for chromium slag without waste, belonging to the technical field of chromium slag treatment. Background technique [0002] Chromium slag is a heavy metal hazardous waste, which contains hexavalent chromium, which is soluble and unstable, and has strong oxidative toxicity, which can cause damage to the human body and crops. If chromium slag is piled up in the open air and soaked by rain and snow, the hexavalent chromium contained will be dissolved and seep into groundwater or enter rivers and lakes to pollute the environment, which is likely to cause larger-scale harm. Chromium slag usually becomes hazardous and toxic waste because it contains 1-2% of carcinogenic calcium chromate and 0.5-1% of highly toxic water-soluble hexavalent chromium. At present, the commonly used chromium slag treatment methods are divided into dr...

Claims

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Application Information

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IPC IPC(8): C01G37/14C01G37/00C04B18/14
CPCC01G37/14C01G37/00C04B18/144Y02W30/91
Inventor 刘统周吴文玉宿高明
Owner 山东同其信息科技有限公司
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