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Method for recycling chromium from chromium passivation wastewater of electrolytic manganese factory

A technology of wastewater recovery and chromium passivation, applied in chemical instruments and methods, chromium compounds, inorganic chemistry, etc., can solve the problems of low wastewater reuse rate and low chromium recovery rate, achieve high chromium recovery rate, improve purity and The effect of product quality and low cost

Active Publication Date: 2011-11-23
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND +1
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  • Abstract
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Problems solved by technology

[0007] At present, there are still the following deficiencies in the treatment technology, chromium recovery and recycling technology of chromium-containing wastewater: (1) The sludge obtained from the traditional chromium-containing wastewater treatment technology is a hazardous solid waste due to its high content of Cr. (2) The chromium recovery rate of the existing chromium recovery technology is still not high (less than 95%); (3) The reuse rate of the chromium-containing wastewater after treatment is low

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  • Method for recycling chromium from chromium passivation wastewater of electrolytic manganese factory

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Effect test

Embodiment 1

[0024] The wastewater is taken from the chromium passivation cleaning wastewater of Daxin Electrolytic Manganese Plant of CITIC Dameng Mining Co., Ltd. The total chromium content in the wastewater is 80mg / L, and the manganese ion content is 300mg / L. First add 1.5mL of 30wt% hydrogen peroxide to 1L of waste water, stir and react, the mixer speed is 60 rpm, the oxidation reaction time is 20min, Cr(III) is oxidized to Cr(VI), and the recovery rate of Cr is improved; then add 5wt% sodium hydroxide adjusts the pH value to 9.0, precipitates for 50min, and separates solid and liquid to remove impurity metal ions such as Mn in the wastewater to improve the purity and quality of chromium recovery products; then add 5wt% sulfuric acid to adjust the pH value to 5.5 ;

[0025] Add 0.1mol / L of Pb 2+ (Pb(NO 3 ) 2 ) 16.8mL, stirred and reacted for 20min, the reaction temperature was controlled at 58°C, and then precipitated for 60min;

[0026] The solid phase part obtained by the precipi...

Embodiment 2

[0029] The wastewater is taken from the chromium passivation cleaning wastewater of Daxin Electrolytic Manganese Plant of CITIC Dameng Mining Co., Ltd. The total chromium content in the wastewater is 74mg / L, and the manganese ion content is 260mg / L. First add 1.2mL of 30wt% hydrogen peroxide to 1L of waste water, stir and react, the mixer speed is 75 rpm, the oxidation reaction time is 15min, Cr(III) is oxidized to Cr(VI), and the recovery rate of Cr is improved; then add Adjust the pH value to 8.0 with 2wt% sodium hydroxide, precipitate for 40 minutes, and separate solid and liquid to remove impurity metal ions such as Mn in the wastewater to improve the purity and quality of the chromium recovery product; then add 2wt% sulfuric acid to adjust the pH value to 4.0;

[0030] Add 0.1mol / L of Pb 2+ (Pb(NO 3 ) 2 ) 15.1mL, stirred and reacted for 30min, the reaction temperature was controlled at 55°C, and then precipitated for 55min;

[0031] The solid phase part obtained by the...

Embodiment 3

[0034] The wastewater is taken from the chromium passivation cleaning wastewater of Daxin Electrolytic Manganese Plant of CITIC Dameng Mining Co., Ltd. The total chromium content in the wastewater is 68mg / L, and the manganese ion content is 266mg / L.

[0035] First add 1mL of 30wt% hydrogen peroxide to 1L of waste water, stir and react, the mixer speed is 90 rpm, the oxidation reaction time is 25min, Cr(III) is oxidized to Cr(VI), and the recovery rate of Cr is improved; then add 3wt% % sodium hydroxide adjusts the pH value to 10.0, precipitates for 60min, and separates the solid and liquid to remove impurity metal ions such as Mn in the waste water to improve the purity and quality of the chromium recovery product; add 3.5wt% sulfuric acid to adjust the pH value to 6.0;

[0036] Add 0.1mol / L of Pb 2+ (Pb(NO 3 ) 2 ) 14.5mL, stirred and reacted for 25min, the reaction temperature was controlled at 60°C, and then precipitated for 40min;

[0037] Wash the solid phase part obtai...

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Abstract

The invention discloses a method for recycling chromium from chromium passivation wastewater of an electrolytic manganese factory. The method is characterized by comprising the following steps of: adding hydrogen peroxide into the chromium passivation wastewater, oxidizing Cr(III) into Cr(VI), adding sodium hydroxide into liquid to remove impurities, such as Mn and other metal ions, adjusting pH and adding Pb<2+>, washing the obtained precipitate part by using water, drying and preparing powder to obtain chrome yellow, adjusting pH of supernate, adding aluminum sulfate, stirring, reacting andperforming solid-liquid separation, wherein the obtained supernate is used for washing the negative plate of the discharged manganese of the electrolytic manganese factory. By the method, the chromium recycling rate is over 99 percent, the impurities, such as manganese and other metal ions are removed, purity of chrome yellow in the product and the product quality are improved, the chromium content in sludge is reduced through recycling and recovering of chromium in wastewater, the sludge does not belong to risky solid wastes, the wastewater can be used for washing the negative plate of the discharged manganese of the electrolytic manganese factory, the policy of energy conservation and emission reduction, recycling of resource, and cyclic utilization is met, and economic benefit is brought to relative industry.

Description

technical field [0001] The invention relates to the technical fields of energy saving and emission reduction, waste recycling and resource utilization, in particular to a method for recovering chromium from chromium passivation wastewater of an electrolytic manganese plant. Background technique [0002] China's electrolytic manganese industry was established in 1956 and has a history of more than 50 years. With the increasing market demand for manganese metal, domestic manganese ore resources are constantly being discovered, and China's electrolytic manganese industry is developing rapidly. In 1992, China's annual production capacity of electrolytic manganese was only 40,000 tons, but it had reached 2 million tons by the end of 2010. It has become the largest producer, consumer and exporter of electrolytic manganese in the world. Electrolytic manganese products are important deoxidizers and desulfurizers in ironmaking and steelmaking, so 90%-95% of the products are used in ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G37/00C02F101/22
Inventor 叶恒朋李维健周俊詹海青杜冬云刘春明黎贵亮刘作泳邓永光张道洪刘栋柱陈南雄张丽云韦慷熊倩李林唐斌
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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