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Solidification method of arsenic-containing sludge

A solidification method and sludge technology, applied in chemical instruments and methods, sludge treatment, fixed/solidified sludge treatment, etc., can solve the problems of unfavorable large-scale use of enterprises, high landfill cost, and large capacity expansion ratio. Achieve the effects of easy operation, good economic benefits and stable operation

Active Publication Date: 2022-05-13
云南大地丰源环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of this application is to provide a solidification method for arsenic-containing sludge, which aims to solve the technical problems of high cost, large volume expansion ratio, high landfill cost and unfavorable large-scale use of the existing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The arsenic-containing sludge comes from a chemical fertilizer factory, and the leaching toxicity test results as it is: pH=4.82, As=136mg / L.

[0049] Weigh 100g of arsenic-containing sludge and 200g of nickel-containing catalyst and stir in a mortar mixer, add 100-200g of water to fully stir to form a slurry, continue to pass in water vapor for heating and aging and stir for 2 hours, after the sludge is matured to a paste, add Lime 60g, fully stirred and reacted to adjust the pH to 9-10, then added 5g of composite iron salt, fully stirred and reacted for 30 minutes, added 15g of cement, stirred and reacted evenly, poured into a mold to form a block, and naturally cured for 7 days after forming, according to " Toxic Leaching Method of Solid Waste - Horizontal Oscillation Method" (HJ 557-2010), "Identification Standard for Hazardous Waste - Identification of Leaching Toxicity" (GB 5085.3-2007) and "Standard for Pollution Control of Hazardous Waste Landfill" (GB18598-2019)...

Embodiment 2

[0052] Weigh 100kg of arsenic-containing sludge and 150kg of nickel-containing catalyst and stir in the mixer in the solidification workshop, add 100-200kg of water to fully stir to form a slurry, continue to feed water vapor for heating and stirring for 3 hours, and wait until the sludge is matured to a paste Add 45kg of lime, fully stir the reaction to adjust the pH to 9-10, then add 4.5kg of composite iron salt, fully stir the reaction for 30 minutes, add 10kg of cement, stir and react evenly, pour it into the material pit for natural maintenance for 12 days, according to "Toxic Leaching of Solid Waste Method - Horizontal Oscillation Method" (HJ 557-2010), "Identification Standards for Hazardous Wastes - Identification of Leaching Toxicity" (GB 5085.3-2007) and "Standards for Pollution Control of Landfill Hazardous Wastes" (GB18598-2019), after passing the leaching toxicity test Landfill.

[0053] The test results of the leaching toxicity of the solidified body: pH=11.32, t...

Embodiment 3

[0055] Weigh 5t of arsenic-containing sludge and 5t of nickel-containing catalyst and stir in the mixer in the curing workshop, add 5-10t of water to fully stir to form a slurry, continue to feed water vapor for heating and stirring for 2.5h, and wait for the sludge to mature to a paste Finally, add 1.5t of lime, fully stir the reaction, adjust the pH to 9-10, then add 150kg of composite iron salt, fully stir the reaction for 30 minutes, add 620kg of cement, stir and react evenly, pour it into the material pit for natural maintenance for 15 days, according to "Solid Waste Toxic Leaching Method - Horizontal Oscillation Method" (HJ 557-2010), "Identification Standard for Hazardous Wastes - Identification of Leaching Toxicity" (GB 5085.3-2007) and "Standards for Pollution Control of Hazardous Waste Landfill" (GB18598-2019), leaching toxicity testing Landfill after qualified.

[0056] The test results of the leaching toxicity of the solidified body: pH=11.13, total arsenic As=0.76...

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PUM

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Abstract

The invention discloses an arsenic-containing sludge curing method which comprises the following steps: adding a nickel-containing catalyst into arsenic-containing sludge, adding water, and mixing and stirring to form slurry; in a stirring state, introducing water vapor into the slurry, and heating and curing for 2-3 hours to obtain a cured material; lime is added into the cured material to adjust the pH value to 9-10, then composite ferric salt is added, the mixture is stirred to react for 30 min, and a pre-cured material is obtained; and adding cement into the pre-cured material, uniformly stirring, pouring into a mold, curing and molding, and naturally curing for 7-15 days after molding, so as to obtain a cured body meeting the landfill standard. The technical problems that in the prior art, the cost is high, the capacity increasing ratio is large, the landfill cost is high, and large-scale use of enterprises is not facilitated are solved.

Description

technical field [0001] The present application relates to the technical field of sludge treatment, in particular to a solidification method of arsenic-containing sludge. Background technique [0002] Both arsenic and arsenic-containing compounds are highly toxic, and the toxicity of As(Ⅲ) is much higher than that of As(Ⅴ), which can damage human liver, kidney and nerves. Once the pollution of arsenic to the environment is formed, it will be difficult to eliminate in the environment, especially the pollution of water and soil, which can eventually enter the human body through the food chain or surface water and groundwater and endanger human health, causing human and animal poisoning incidents. occur. The environmental pollution and harm caused by the arsenic slag produced during the smelting process and the arsenic-containing waste slag produced by the treatment of waste water and waste acid have not been completely eradicated. Therefore, arsenic-containing sludge has beco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
CPCC02F11/008C02F2101/103
Inventor 李行德李文豪张卫东李超罗朝东
Owner 云南大地丰源环保有限公司
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