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Method for solidifying calcium arsenate slag cement

A technology of cement solidification and calcium arsenate, applied in chemical instruments and methods, solid waste removal, solid waste management, etc., can solve the problem of high transportation and landfill costs, large weight gain ratio and volume increase ratio, and economic pressure on treatment Large and other problems, to achieve the effect of low treatment cost, long-term stable improvement, and small dosage

Pending Publication Date: 2022-02-01
YUNNAN CHIHONG ZINC & GERMANIUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dosage of this method is large, the weight gain ratio and volume increase ratio are large, resulting in a large area for storage by enterprises, high transportation and landfill costs, and great economic pressure for enterprises to deal with, so it is difficult to widely popularize and use.

Method used

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  • Method for solidifying calcium arsenate slag cement
  • Method for solidifying calcium arsenate slag cement
  • Method for solidifying calcium arsenate slag cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 30g of calcium arsenate slag and 30g of asphalt, control the temperature at 150°C, mix, stir and cool to make granules (particle size 0.5-3mm). Take 6g of 425# cement, mix it with calcium arsenate particles, stir evenly, and let it stand for 28 days. According to the national standard (HJ / T299-2007), the leaching concentration of arsenic was detected, the leaching concentration of arsenic was 0.208mg / L, and the strength test result was 17.8MPa, which met the discharge standard stipulated by the state.

Embodiment 2

[0033] Take 30g of calcium arsenate slag and 30g of asphalt, control the temperature at 150°C, mix, stir and cool to make granules (particle size 0.5-3mm). Take 30 grams of river sand, 60 grams of 425# cement, mix them with calcium arsenate particles, stir evenly, and let it stand for 28 days. According to the national standard (HJ / T299-2007), the leaching concentration of arsenic was tested, the leaching concentration of arsenic was 0.011mg / L, and the strength test result was 50.1MPa, which met the discharge standard stipulated by the state.

Embodiment 3

[0035] Take 30g of calcium arsenate slag and 3g of asphalt, control the temperature at 150°C, mix, stir and cool to make granules (particle size 0.5-3mm). Take 6g of 425# cement, mix it with calcium arsenate particles, stir evenly, and let it stand for 28 days. According to the national standard (HJ / T299-2007), the leaching concentration of arsenic was tested. The leaching concentration of arsenic was 0.627mg / L, and the strength test result was 13.7MPa, which reached the national emission standard.

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Abstract

The invention relates to a method for solidifying calcium arsenate slag cement, and belongs to the field of solid waste treatment. The method comprises the following steps: mixing calcium arsenate slag with a binder such as asphalt to prepare particles, then mixing the particles with river sand or water disintegrating slag and calcium arsenate particles, and carrying out curing treatment by using cement. The method can realize permanent and stable harmless treatment of the arsenic slag. The method is simple to operate, low in reaction temperature and stable in performance of the generated calcium and arsenic slag, has the advantages of low treatment cost, small dosage, low leaching toxicity and the like, and is very suitable for safe disposal stockpiling and safe landfill of the calcium arsenate slag.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a method for solidifying calcium arsenate slag cement. Background technique [0002] Heavy metal ores in non-ferrous metals generally have polymetallic symbiosis, among which lead, zinc, copper, and tin are rich in harmful substances such as sulfur and arsenic. During the smelting process of non-ferrous metals, sulfur is collected through acid production and the control of sulfur pollution is realized . The anode slime produced by copper electrolysis contains high levels of toxic arsenic, which poses a great threat to people's production and life. Alkaline treatment can be used for anode slime to convert arsenic into relatively stable calcium arsenate, which is also a solid waste containing arsenic. Due to the strong toxicity of calcium arsenate produced by chemical precipitation, the particles are fine, and the storage will produce Toxic smoke and dust will rev...

Claims

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Application Information

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IPC IPC(8): B09B3/27B09B3/23B09B3/24C04B28/00C04B18/14C04B111/00B09B101/55
CPCC04B28/00C04B18/141C04B2201/50C04B2111/00017C04B2103/44C04B14/06Y02W30/91
Inventor 杨大锦马雁鸿李瑞冰卢文鹏裴启飞李衍林贾著红单祖宇何宗云张候文肖宜彬吴楠庞博张启旭姚智馨王振威张吉祥于三三李双明
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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