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Preparation method of heavy metal solid waste curing agent

A technology for solid waste and solid waste, which is applied in the field of preparation of a solidifying agent for heavy metal solid waste, can solve the problems of poor solidification effect of heavy metals, inability of solid waste to be recycled, and harmless reduction in quantity.

Inactive Publication Date: 2013-03-27
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for efficient treatment without causing harmful side-effects such as soluble metal contamination during production processes while also producing useful products that could help save resources by reusing them after use.

Problems solved by technology

Technological Problem: Current Heavy Metal Control Solid Waste Treatment Method Using Cements Existing Sheet Materials However, these current compositions have drawbacks like poor performance or high costs due to their use of expensive chemical agents.

Method used

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  • Preparation method of heavy metal solid waste curing agent
  • Preparation method of heavy metal solid waste curing agent
  • Preparation method of heavy metal solid waste curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of heavy metal solid waste solidifying agent comprises the steps:

[0029] 1) Test block production, curing agent composition and weight percentage

[0030] Dead-burned magnesium oxide powder accounts for 30%; potassium dihydrogen phosphate accounts for 25%; borax accounts for 3%; fly ash accounts for 8%; heavy metal solid waste accounts for 19%, of which heavy metal accounts for 0.5% of the total curing agent After mixing with water, make a test block of 707mm×707mm×707mm;

[0031] The test block is used for testing after curing for 7 days at a temperature of 20°C and a relative humidity above 90%;

[0032] 2) Take the cured and crushed test piece and grind it finely, pass it through a 0.6 mm sieve for later use, mix 50 g of the finely ground powder with 1 000 mL of extraction solution, and stir for 18 hours with a dissolution tester; during the leaching process , take 2 different leaching conditions for horizontal comparison; these 2 leaching ...

Embodiment 2

[0044] Embodiment 2, the method comprises the steps:

[0045] 1) Test block production, curing agent composition and weight percentage

[0046]Dead-burned magnesium oxide powder accounted for 45%; potassium dihydrogen phosphate accounted for 30%; borax accounted for 5%; fly ash accounted for 10%; After mixing with water, make a test block of 707mm×707mm×707mm;

[0047] The test block is used for testing after curing for 8 days at a temperature of 20°C ± 3°C, a relative humidity of more than 90%;

[0048] 2) Take the cured and crushed test piece and grind it finely, pass it through a 0.6 mm sieve for later use, mix 50 g of the finely ground powder with 1 000 mL of extraction solution, and stir for 18 hours with a dissolution tester; during the leaching process , take 2 different leaching conditions for horizontal comparison; these 2 leaching conditions are: Condition 1, according to TCLP standard preparation of extraction agent: 5.7 mL of glacial acetic acid in 500 mL of dist...

Embodiment 3

[0060] Embodiment 3, the method comprises the steps:

[0061] 1) Test block production, curing agent composition and weight percentage

[0062] Dead-burned magnesia powder accounted for 35%; potassium dihydrogen phosphate accounted for 28%; borax accounted for 4%; fly ash accounted for 9%; After mixing with water, make a test block of 707mm×707mm×707mm;

[0063] The test block is used for testing after being cured for 28 days at a temperature of 17°C and a relative humidity above 90%;

[0064] 2) Take the cured and crushed test piece and grind it finely, pass it through a 0.6 mm sieve for later use, mix 50 g of the finely ground powder with 1 000 mL of extraction solution, and stir for 18 hours with a dissolution tester; during the leaching process , take 2 different leaching conditions for horizontal comparison; these 2 leaching conditions are: Condition 1, according to TCLP standard preparation of extraction agent: 5.7 mL of glacial acetic acid in 500 mL of distilled water...

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Abstract

The invention relates to a preparation method of a heavy metal solid waste curing agent. The method comprises the following steps: 1) composition of the curing agent: the curing agent comprises the following components of: 30% to 45% of dead-burned magnesia powder, 25% to 30% of monopotassium phosphate, 3% to 5% of borax, 8% to 10% coal ash and 19% to 25% of heavy metal solid wastes, wherein heavy metal accounts for 0.5% to 0.7% of the total weight of the curing agent and is mixed with 0.08 % to 0.1% of water; 2) maintenance of a curing body: the curing body is maintained at the temperature of 20+/-3 DEG C and under the relative humidity being more than 90% for 7 or 28 days; 3) compression resisting strength: the maintained curing body put on a compression testing machine to carry out a compression resisting test; and 4) toxic leaching. The method has the advantages that the efficient curing is realized, i.e. the leaching concentration of the heavy metal is low all the time regardless of that whether an EN12457-2 testing method or a TCLP1311 leaching method is adopted; and the reutilization is realized, i.e. the curing body can be used as a building material, so that the heavy metal hazardous wastes are converted into a safe and environmental-friendly building material.

Description

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Claims

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Application Information

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Owner YANCHENG INST OF TECH
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