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Method for treating arsenic pollutants with calcic aluminiferous material

A technology of pollutants and aluminum materials, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of inability to remelt, pollute water sources, soil, environment, and high prices

Inactive Publication Date: 2013-04-24
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of these stabilizers is relatively high, so it is of great practical significance to find cheap stabilizers to obtain greater economic benefits
[0004] Solid-phase calcium-aluminum waste, due to processing costs and other reasons, generally cannot be melted back, so it has to be piled up and gradually oxidized, thereby polluting water sources, soil, and the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The object of treatment is arsenic-containing slag from a chemical plant. The arsenic-containing slag is earthy yellow. Analysis of its main element composition shows that the arsenic content is 7.32%. The calcium-aluminum-containing material is taken from a factory of high-alumina cement, which is gray in color, and the calcium-aluminum content is 66.5% through component testing. Take 2g dry weight of arsenic-containing slag and disperse it in 100ml of aqueous solution, take 0.2g of dried high-alumina cement, add it to the above dispersion, the dry weight ratio of high-alumina cement and arsenic-containing slag is 1:10, shake at room temperature for 24 hours, Leave to age and then filter for solid-liquid separation. After testing, the arsenic fixation rate is close to 100%, and the arsenic leaching rate after fixation can meet the requirements of the national hazardous waste identification standard.

Embodiment 2

[0024] The properties of arsenic pollutants and calcium-aluminum-containing materials are the same as in Example 1. Change the proportion of arsenic pollutants and calcium-aluminum-containing materials, take 2g of dry weight of arsenic-containing slag and disperse it in 100ml of aqueous solution, take 0.1g of dried high-alumina cement, and the dry weight ratio of high-alumina cement and arsenic-containing slag is 1:20 ; Concrete operation is with embodiment 1. The results show that the leaching rate of arsenic after fixation can meet the requirements of national hazardous waste identification standards.

Embodiment 3

[0026] Take the same arsenic-containing slag as in Example 1, and 2 g of dry weight are dispersed in 100 ml of aqueous solution. Take a construction waste dolomite powder from a factory, in which the calcium aluminum content in the waste dolomite powder is 72.5%, take 0.2g of dolomite powder after drying treatment, and add it to the above dispersion liquid, the dry weight ratio of dolomite powder and arsenic-containing slag Be 1:10, other steps are with embodiment 1. The test results show that the arsenic leaching rate after fixation can meet the requirements of the national hazardous waste identification standard. The purpose of stabilizing the treatment of arsenic pollutants is achieved, and at the same time, the effective resource utilization of calcium-aluminum-containing wastes is realized.

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Abstract

The invention relates to a method for treating arsenic pollutants with a calcic aluminiferous material, belonging to the technical fields of waste material recycling and arsenic pollutant stabilization. The calcic aluminiferous material used as a stabilizer contains abundant calcium and aluminum: in the arsenic pollutant stabilization process, the calcium directly precipitates with (AsO4)3<->; the (AsO4)3 intercalation forms hydrotalcite-like calcium aluminum-LDH and surface adsorption action with calcium and aluminum in the system; and under the coagulation precipitation actions of the aluminum ions on the arsenate radical, the goal of arsenic pollutant stabilization is achieved. The method comprises the following steps: taking a certain amount of arsenic pollutants, dispersing the arsenic pollutants in a water solution, and adding the calcic aluminiferous material, wherein the dry weight proportion of the calcic aluminiferous material to the arsenic pollutants is 1:10-1:20; and oscillating at room temperature for 12-24 hours, standing for aging, filtering, and carrying out solid-liquid separation. The stabilizer calcic aluminiferous material is cheap, accessible and stable, is used for arsenic pollutant stabilization, and has important economic, environmental and social meanings.

Description

technical field [0001] The invention relates to a method for treating arsenic pollutants with calcium-aluminum materials, relates to the effective utilization of calcium-aluminum materials and a process for treating arsenic pollutants, and belongs to the technical field of recycling waste and stabilizing arsenic pollutants. Background technique [0002] Arsenic pollution has caused great harm to the environment. If its toxic substances are lost into the environment from waste, it will cause serious pollution to the environment. Arsenic is a metal substance that can form a series of highly toxic compounds. Arsenic can be absorbed by the human body through the skin, respiratory tract and digestive tract, which can cause neurasthenia syndrome, polyneuropathy and skin and mucous membrane lesions, and can cause lung cancer and skin cancer. wait. The discharge of arsenic increases the toxicity of wastewater, and improper disposal of arsenic-containing waste can cause serious arse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/62
Inventor 钱光人刘强周吉峙窦丽李传华李娜洪瑞金蒋明华徐洋
Owner SHANGHAI UNIV
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