Method for treating hexavalent chromium in wastewater by using gold tailing products

A treatment method, hexavalent chromium technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as secondary pollution, high treatment costs, and environmental pollution in reservoir areas. Achieve the effect of no secondary pollution and high efficiency

Inactive Publication Date: 2016-07-27
北京泰克美高新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for the treatment of chromium wastewater, the methods of chemical precipitation, ion exchange and activated carbon adsorption are mainly used, while the treatment of hexavalent chromium is mainly to reduce the toxic hexavalent chromium to almost non-toxic and stable through chemical reduction reaction. Trivalent chromium compounds, however, deal with hexavalent chromium through reduction reaction, the treatment cost is high, and new chemical components are introduced into the wastewater, causing secondary pollution
[0004] There is a large amount of gold mining in my country, but the recovery rate of a large amount of tailings produced by mining is low, and it is mainly disposed of in the form of inventory, which not only occupies a large amount of land, causes environmental pollution around the reservoir area, but also requires a large amount of funds to be invested in the construction of tailings ponds and maintenance management, even there are certain security risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The gold tailings used include gold tailings with a particle size of 80-100 mesh without cyanidation process and cyanide tailings with a particle size of 80-100 mesh. The gold tailings without cyanide process need to be cleaned before use. Acid treatment. Soak the gold tailings that have not been cyanided in 20% hydrochloric acid solution for 12 hours, shake for 2 hours, and then rinse with deionized water until there is no Cl - (with saturated AgNO 3 inspection), then dry the tailings and cool to obtain acidified gold tailings that have not been through the cyanidation process.

[0025] The acidified gold tailings with a particle size of 80-100 meshes without cyanidation process and the cyanided tailings with a particle size of 80-100 meshes are respectively added to the chromium-containing wastewater. The source of chromium-containing wastewater is obtained by adding 5 mg of potassium dichromate to every liter of river water taken from Beijing; then the ratio of tai...

Embodiment 2

[0028] The gold tailings used include gold tailings with a particle size of 80-100 mesh without cyanidation process and cyanide tailings with a particle size of 80-100 mesh. The gold tailings without cyanide process need to be cleaned before use. Acid treatment. Soak the gold tailings that have not been cyanided in 10% hydrochloric acid solution for 12 hours, shake for 2 hours, and then rinse with deionized water until there is no Cl - (with saturated AgNO 3 inspection), then dry the tailings and cool to obtain acidified gold tailings that have not been through the cyanidation process.

[0029] Fill the acidified gold tailings with a particle size of 80-100 mesh without cyanidation process and the cyanided tailings with a particle size of 80-100 mesh respectively into the injection tube, and use a gauze interlayer at the bottom of the injection tube, and then add the prepared six Valence chromium wastewater, the source of said chromium-containing wastewater is obtained by ad...

Embodiment 3

[0032] The gold tailings used include gold tailings with a particle size of 80-100 mesh without cyanidation process and cyanide tailings with a particle size of 80-100 mesh. The gold tailings without cyanide process need to be cleaned before use. Acid treatment. Soak the gold tailings that have not been cyanided in 20% hydrochloric acid solution for 12 hours, shake for 2 hours, and then rinse with deionized water until there is no Cl -(with saturated AgNO 3 inspection), and then mixed with cement and pressed into gold tailing permeable bricks that have not undergone cyanidation process. Cyanide tailings permeable bricks are directly pressed after mixing cyanide tailings and cement. The size of seepage brick is 5cm*5cm*1.5cm.

[0033] Place the gold tailing slag seepage brick and the cyanide tailing slag seepage brick horizontally respectively. The source of the chromium-containing wastewater is obtained by adding 5 mg of potassium dichromate per liter of river water taken ...

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Abstract

The invention provides a method for treating hexavalent chromium in wastewater by using gold tailing products, comprising: mixing gold tailing products with hexavalent chromium wastewater for treatment to obtain treated wastewater. In the invention, gold tailing products are used as a treating agent for treating hexavalent chromium, it is discovered that this treating agent has high efficiency in treating hexavalent chromium without secondary pollution, and additionally gold tailings provided herein is waste itself; the method provided herein enables recycling of waste, enables 'treating waste with waste' to be achieved simply and effectively, and is both energy-efficient and environment-friendly.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a treatment method for waste water containing hexavalent chromium. Background technique [0002] Chromium (Cr) mainly exists in two valence states Cr(III) and Cr(VI) in the environment, among which, the toxicity of Cr(VI) is about 100 times higher than that of Cr(III), and Cr(VI) is a Chromium is a strong oxidizing agent with strong carcinogenic, mutagenic and mutagenic effects. For example, it can induce lung cancer and nasopharyngeal cancer. In addition, chromium can also stimulate skin and mucous membranes, which can cause dermatitis, eczema, bronchitis and rhinitis. Moreover, chromium is not easy to be decomposed by microorganisms and is easy to accumulate in organisms, so water-soluble Cr(VI) has been listed as one of the eight most harmful chemical substances to the human body, and is one of the three internationally recognized carcinogenic metals. Countries in the world ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F101/22
CPCC02F1/00C02F2101/22
Inventor 王兵李学科陈尚义吕伟青郑玉静
Owner 北京泰克美高新技术有限公司
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