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A kind of stabilization treatment method of arsenic iron slag

A stabilization treatment, iron slag technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of strict process parameters, limited treatment degree, excessive arsenic content in effluent, etc., to reduce environmental pollution Pollution, prevention of volatilization of arsenic, and short curing process

Active Publication Date: 2020-07-24
湖南艾森尼克环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lime method defect is: 1) treatment degree is limited
In this regard, of course, it can also be dissolved away, and then treated with scorodite method, but due to the characteristics of high temperature and high pressure, this method has high requirements on equipment and strict requirements on process parameters, which may easily cause the arsenic content in the effluent to exceed the standard. Secondary treatment is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 The sample of arsenic iron slag was taken from an electroplating wastewater treatment plant in Xiangxiang City, Hunan Province. It was mechanically dehydrated arsenic iron slag with a moisture content of 48.5%. The toxicity leaching test (HJT299-2007) was directly carried out on this slag, and the arsenic leaching concentration reached 38.554mg / L, which belongs to hazardous solid waste.

[0017] Take 2Kg of arsenic iron slag for cleaning, remove alkali metals such as sodium and potassium therein, and perform liquid-solid separation to obtain arsenic iron slag mud cake. The stabilizer is obtained by mixing calcium hydroxide and magnesium carbonate uniformly at a molar ratio of calcium to magnesium of 2:1. Add the stabilizer according to the molar ratio of the active ingredient in the stabilizer to the arsenic in the arsenic-iron slag mud cake of 0.8:1, stir and mix well, then place it in a muffle furnace for roasting, the roasting temperature is controlled at 8...

Embodiment 2

[0018] Example 2 The sample of arsenic iron slag was taken from a mine wastewater treatment station in Chenzhou City, Hunan Province. It was mechanically dehydrated arsenic iron slag with a moisture content of 56.7%. The toxicity leaching test (HJT299-2007) was directly carried out on this slag, and the arsenic leaching concentration reached 27.658mg / L, which belongs to hazardous solid waste.

[0019] Take 5 kg of arsenic-iron slag for cleaning, remove alkali metals such as sodium and potassium therein, and perform liquid-solid separation to obtain arsenic-iron-iron slag mud cake. Calcium oxide and magnesium hydroxide are uniformly mixed according to the calcium-magnesium molar ratio of 1:1 to obtain a stabilizer. Add the stabilizer according to the molar ratio of the active ingredient in the stabilizer to the arsenic in the arsenic-iron slag mud cake of 0.6:1, stir and mix well, then place it in a tube furnace for roasting, and during the roasting process, air is introduced t...

Embodiment 3

[0021] Other conditions are the same as in Example 1, but the stabilizer is only calcium oxide, the addition amount is the same, and the treatment conditions are the same. After completion, the obtained product is subjected to a toxicity leaching test test, and its arsenic leaching concentration is 4.221 mg / L.

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Abstract

The invention discloses a method for stabilizing the arsenic-iron slag, which specifically comprises: cleaning the arsenic-iron slag, removing alkali metals such as sodium and potassium in the arsenic-iron slag, adding a stabilizer to the obtained arsenic-iron slag, mixing them uniformly, and performing roasting treatment. Upon completion, the arsenic iron slag is stabilized. The invention has the following beneficial effects: (1) volatile substances such as moisture in the waste slag are volatilized during the heating process, and the reduction of arsenic iron slag is realized; (2) the stable solidification process is short, the operation is simple, and the cost is relatively low; (3) The energy consumption and cost of the treatment process are relatively low; (4) the stabilizer of the present invention can more effectively prevent the volatilization of arsenic and reduce environmental pollution. (5) No waste water is generated during the treatment process, and no secondary treatment is required.

Description

technical field [0001] The invention relates to a method for stabilizing arsenic-iron slag, in particular to a method for stabilizing arsenic-iron slag produced after treating low-concentration arsenic-containing wastewater with an arsenic concentration less than 50 mg / L by an iron salt adsorption method. Background technique [0002] Arsenic compounds are highly toxic. If not handled properly, their toxicity will be released, which will pose a huge threat to the environment and human health. In recent years, arsenic pollution accidents in my country have shown a high incidence, such as Chenzhou in Hunan, Dushan in Guizhou, Nandan in Guangxi, Fuxin in Liaoning, Baoding in Hebei, Yangzonghai in Yunnan and other places, causing huge economic losses and human losses. casualties. [0003] At present, the lime method and iron salt method are mostly used for arsenic-containing wastewater. Lime method defect is: 1) treatment degree is limited. Generally, the arsenic in wastewater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00B09B2101/02
Inventor 杨康姚理为胡克伟何建徐月冰王大伟
Owner 湖南艾森尼克环保科技有限公司
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