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A kind of curing agent and heavy metal curing method for controlling heavy metal pollution

A curing method and heavy metal technology, which is applied in the field of solid waste pollution control, can solve the problems of heavy metal curing agent usage, insignificant curing efficiency, and high processing cost, so as to reduce the risk of heavy metal leaching and achieve harmlessness/stabilization Safe handling, the effect of less dosage

Active Publication Date: 2017-01-18
SHENZHEN TECHAND ECOLOGY & ENVIRONMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a heavy metal curing agent with low dosage, low processing cost and high curing efficiency in view of the problems in the prior art that the heavy metal curing agent is used in a large amount, the processing cost is high, and the curing efficiency is not significant. Heavy metal curing agent and curing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]The heavy metal solidifying agent of the invention is used to treat waste smelting slag. The leaching copper content in the slag was measured to be 9.82 mg / kg, and the leaching lead content was 1.69 mg / kg.

[0034] The formula of the heavy metal solidifying agent provided according to the present embodiment is: the fly ash of 60 mass parts, the ordinary portland cement of 30 mass parts, the potassium hydrogen phosphate of 10 mass parts, the fly ash is ground and passed through a 60 mesh sieve and The other two are thoroughly mixed.

[0035] Add the above heavy metal curing agent according to 30% of the weight of the waste slag, mix and stir evenly, then add water and mix into a paste. Cured for 7 days under the conditions of normal temperature and relative humidity of 90%. After 7 days, refer to the standard GB5086.2-1997 "Solid Waste Leaching Toxicity Leaching Method - Horizontal Oscillating Method" to detect the content of leaching copper and lead in the solidified b...

Embodiment 2

[0037] The object of solidification treatment is the same as the waste slag in embodiment 1.

[0038] The formula of the heavy metal curing agent is: 60 parts by mass of calcium carbide slag, 30 parts by mass of lime, 10 parts by mass of sodium hydrogen phosphate, grind the carbide slag finely through a 60-mesh sieve and fully mix with the other two.

[0039] Add the above heavy metal curing agent according to 30% of the weight of the waste slag, mix and stir evenly, then add water and mix into a paste. Cured for 7 days under the conditions of normal temperature and relative humidity of 90%. After 7 days, refer to the standard GB5086.2-1997 "Solid Waste Leaching Toxicity Leaching Method - Horizontal Oscillating Method" to detect the content of leaching copper and lead in the solidified body. The results showed that the leaching copper content in the solidified body was 1.88 mg / kg, and the leaching lead content was 0.45 mg / kg, which were respectively reduced by 80.9% and 73.4%...

Embodiment 3

[0041] The processing object is the same as the waste slag in embodiment 1.

[0042] The formula of the heavy metal curing agent is: 55 parts by mass of blast furnace slag, 30 parts by mass of lime, 10 parts by mass of bentonite, and 5 parts by mass of aluminum sulfate. The blast furnace slag is ground and passed through a 60-mesh sieve and fully mixed with the other three.

[0043] Add the above heavy metal curing agent according to 30% of the weight of the waste slag, mix and stir evenly, then add water and mix into a paste. Cured for 7 days under the conditions of normal temperature and relative humidity of 90%. After 7 days, refer to the standard GB5086.2-1997 "Solid Waste Leaching Toxicity Leaching Method - Horizontal Oscillating Method" to detect the content of leaching copper and lead in the solidified body. The results showed that the leaching copper content in the solidified body was 0.94mg / kg, and the leaching lead content was 0.26mg / kg, which were respectively redu...

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Abstract

The invention relates to a curing agent for treating heavy metal pollution and a heavy metal curing method. The curing agent is prepared from following raw materials, by mass, 30-70 parts of a curing framework material, 20-60 parts of a curing cementing material and 5-10 parts of a curing promoter. The curing framework material is at least one of fly ash, blast furnace slag, carbide slag and calcined coal gangue powder; the curing cementing material is at least one of ordinary Portland cement and lime; and the curing promoter is at least one of potassium hydrogen phosphate, sodium hydrogen phosphate and aluminum sulfate. The heavy metal curing method includes following steps: mixing the curing agent, solid waste and water with stirring into paste to form a curing body, wherein a usage amount of the curing agent accounts for 30-50% of the dry weight of the solid waste; and maintaining the mixed curing body at normal temperature under a relative humidity of 90% for at least seven days, thereby finishing the heavy metal curing process. By means of the curing agent and the heavy metal curing method, a heavy metal curing efficiency is high and a treatment cost is low.

Description

technical field [0001] The invention relates to the field of solid waste pollution treatment, in particular to a curing agent and a heavy metal solidification method for treating solid waste heavy metal pollution. Background technique [0002] The pollution control of solid waste is one of the key points and difficulties in my country's current environmental protection work, especially waste smelting slag, waste incineration fly ash, industrial wastewater sludge and other solid waste containing heavy metals. Cause serious pollution, and even seriously threaten the physical and mental health of the people. However, because heavy metals do not degrade in the environment, they are prone to change in form and valence under different environmental conditions, and their activity, mobility, and biological toxicity will also vary greatly. Therefore, it is very difficult to control heavy metal pollution. [0003] There are many types of existing heavy metal pollution treatment techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/10
Inventor 李诗刚龚亚龙杨泳王丽朱蔚利郭震张志卿周顺桂
Owner SHENZHEN TECHAND ECOLOGY & ENVIRONMENT CO LTD
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