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Method for preparing sulfate akaganeite adsorbent for de-arsenation

A sulfate and lepidocite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of unsuitable mass production and low yield

Active Publication Date: 2007-11-14
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the low yield of the existing method for preparing Schwertmannite ore, and the defects that are not suitable for mass production, thereby providing a high yield, large-scale production of tetragonal sulfate lepidocite adsorbent for arsenic removal preparation method

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] The molar ratio of ferric chloride and sodium sulfate is Fe 3+ : SO 4 2- = Dissolve in aqueous solution at a ratio of 4:1, stir and mix evenly at 20°C, the concentration of iron ions in the mixed solution is 0.4M; under stirring, quickly add 2M sodium hydroxide solution dropwise to the solution pH to 4.0; stir for 6 hours; then slowly add dropwise 2M sodium hydroxide solution to pH9.5, then stop stirring and let it stand for 24 hours; centrifuge and separate with deionized water until the pH of the effluent is close to neutral, SO 4 2- It cannot be detected by ion chromatography; the washed product is dried at 40°C for 24 hours to obtain a tetragonal sulfate lepidocite adsorbent for arsenic removal.

[0018] The volumetric yield of this type of Schwertmannite mineral is 26g / L, much higher than the yield of 1g / L in the standard method in the prior art. When the tetragonal sulfate lepidocite adsorbent is used to treat arsenic-containing water (when the equilibrium con...

Embodiment 2

[0020] Ferric nitrate and potassium sulfate are Fe in molar ratio 3+ : SO 4 2- = Dissolve in aqueous solution at a ratio of 4:1, stir and mix evenly at 30°C, the concentration of iron ions in the mixed solution is 0.31M; under stirring, quickly add 6M sodium hydroxide solution dropwise to the solution pH to 4.0; stirred for 10 hours; then slowly added dropwise 6M sodium hydroxide solution to pH 8.0, then stopped stirring, and stood still for 24 hours; centrifugally washed and separated with deionized water until the pH of the effluent was close to neutral; the washed product was at 40 After drying at ℃ for 24 hours, the tetragonal sulfate lepidocite adsorbent for arsenic removal is prepared.

[0021] The volumetric yield of this type of Schwertmannite mineral is 24g / L, much higher than the yield of 1g / L in the standard method in the prior art. When the tetragonal sulfate lepidocite adsorbent is used to treat arsenic-containing water (when the equilibrium concentration of ar...

Embodiment 3

[0023] The molar ratio of ferric chloride and potassium sulfate is Fe 3+ : SO 4 2- = Dissolve in aqueous solution at a ratio of 3:1, heat to 50°C, stir and mix evenly, the concentration of iron ions in the mixed solution is 0.33M; at 50°C, while stirring, quickly add 3M potassium hydroxide solution dropwise to the above solution , until the pH of the solution is 4.0; continue to stir for 1 hour; then slowly add dropwise 3M potassium hydroxide solution to pH 7.5, then stop stirring, and let it stand for 24 hours; centrifugally wash and separate with deionized water until the pH of the effluent is close to neutral; wash The final product was dried at 40° C. for 24 hours to obtain a tetragonal sulfate lepidocite adsorbent for arsenic removal.

[0024] The volumetric yield of this type of Schwertmannite mineral is 21g / L, much higher than the yield of 1g / L in the standard method in the prior art. When the tetragonal sulfate lepidocite adsorbent is used to treat arsenic-containin...

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PUM

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Abstract

The present invention relates to a preparation method of tetragonal sulfate lipidocrocite adsorbing agent for removing arsenic. Said preparation method includes the following steps: dissolving molysite and sulfate in aqueous solution according to a certain ratio, the molysite concentration is greater than 0.3M, firstly, adding alkali solution until solution pH value is 4.0, continuously stirring, then slowly adding alkali solution until solution pH value is 7.5-9.5, standing still for 24h, centrifugal separation, using deionized water to wash solid, drying so as to obtain the invented tetragonal sulfate lepidocrocite adsorbing agent for removing arsenic.

Description

technical field [0001] The invention belongs to the field of adsorption materials, and in particular relates to a preparation method of a tetragonal sulfate lepidocite adsorbent used for removing arsenic. Background technique [0002] At present, many countries and regions in the world have the problem of arsenic pollution in drinking water. About 20 countries have found that there are endemic arsenic disease areas or high arsenic areas, and the arsenic content in drinking water exceeds 0.05mgL. -1 The population of Shui is more than 50 million people. In Xinjiang, Inner Mongolia, Shanxi, Ningxia, Jilin, Qinghai, Anhui, Beijing and other places in mainland China, 8 provinces, 40 counties, and 1,047 villages were affected by 2,343,238 people, among whom drinking water arsenic > 0.05mg / L high arsenic exposure The population is 522,566, and 7,821 people were found to be poisoned by arsenic. At present, countries and international organizations in the world have increasingl...

Claims

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Application Information

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IPC IPC(8): B01J20/06C02F1/28C02F1/58
Inventor 杨敏豆小敏张昱邬晓梅高迎新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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