Method for stably treating arsenic caustic sludge

A technology for stabilization treatment and arsenic-alkali slag, which is applied in the direction of improving process efficiency, can solve the problems of safe landfill disposal without arsenic-alkali slag, restricting process use, and high treatment costs, so as to achieve low cost of chemicals and reduce bioavailability , The effect of simple processing technology

Active Publication Date: 2015-01-07
POWERCHINA ZHONGNAN ENG +1
View PDF8 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such processes need to dissolve arsenic-alkali slag in a large amount of water, and direct discharge will bring huge pollution to the environment. Advanced treatment is required to meet the discharge standards. The high cost of treatment restricts the use of this type of process.
However, there is currently no technology for safe landfill disposal of high-concentration, high-alkalinity arsenic-alkali slag

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 500g of arsenic-alkali slag, add 150g of ferrous sulfate heptahydrate, that is, add according to the iron:arsenic molar ratio of 2:1, and stir for 10 minutes. Then, 75mL of dilute sulfuric acid with a concentration of 50% by mass was added, that is, the liquid-solid ratio was 1.5:10, and stirred for 10 minutes. Finally, it was placed at room temperature for 1 day and then the arsenic leaching concentration was measured. The test results showed that the leaching concentration of arsenic decreased from the original 4053mg / L to 0.88mg / L after treatment, meeting the requirements for entering hazardous waste landfills.

Embodiment 2

[0031] Take 500g of arsenic-alkali slag, add 144g of ferric chloride hexahydrate, that is, add according to the iron:arsenic molar ratio of 2:1, and stir for 10 minutes. Then add 50g of clay and stir for 10min. Then, add 100 mL of dilute sulfuric acid with a mass percentage concentration of 30%, that is, the liquid-solid ratio is 2:10, and stir for 10 min. Finally, it was placed at room temperature for 1 day and then the arsenic leaching concentration was measured. The test results showed that the leaching concentration of arsenic decreased from the original 4053mg / L to 0.64mg / L after treatment, meeting the requirements for entering hazardous waste landfills.

Embodiment 3

[0033] Take 200kg of arsenic-alkali slag, add 60kg of ferrous sulfate heptahydrate, that is, add according to the iron:arsenic molar ratio of 2:1, and stir for 20 minutes. Then, 30L of dilute sulfuric acid with a concentration of 50% by mass was added, that is, the liquid-solid ratio was 1.5:10, and stirred for 20 minutes. Finally, leave it at room temperature for 3 days and then measure the arsenic leaching concentration. The test results showed that the leaching concentration of arsenic was reduced from the original 4231mg / L to 0.36mg / L after treatment, meeting the requirements for entering hazardous waste landfills.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a new method for treating arsenic caustic sludge. According to the method, the arsenic caustic sludge is preliminarily crushed; stabilizer ferric salt is added into the arsenic caustic sludge to be evenly stirred; dilute acid solutions are added into the arsenic caustic sludge to be evenly stirred; finally, natural curing is carried out. According to the method, the problem of the pollution or potential menace of existing high-concentration arsenic caustic sludge (pH is larger than 12) to the environment is solved, and the leaching toxicity of the arsenic caustic sludge is reduced so as to meet the entrance requirement of a hazardous waste landfill. The method is simple in technology, raw materials are easily obtained, the disposal cost is low, and the method has the good application prospect.

Description

technical field [0001] The invention belongs to the technical field of remediation of soil heavy metal pollution. The invention relates to a method for stabilizing arsenic-alkali slag. Background technique [0002] Most antimony ores in my country contain arsenic. During the antimony smelting and refining process, the arsenic-removing scum produced by adding soda ash to remove arsenic and the secondary arsenic-alkali slag produced by its reduction are collectively referred to as arsenic-alkali slag (pH>12). The arsenic-alkali slag produced by this smelting process has high alkalinity, high total concentration of arsenic and high leaching toxicity, and is a kind of hazardous waste that is very difficult to dispose of. The average content of arsenic in arsenic-alkali slag is 1%-20%, and its main components are sodium arsenate, sodium antimonate and sodium carbonate. Since the arsenic in the arsenic-alkali slag exists in the form of sodium arsenate, which is highly toxic a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 李勇杜成琼陈湘斌马秒郭沨吴霞陆晓华王玲琳王鑫黎慧娟
Owner POWERCHINA ZHONGNAN ENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap