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Stabilization landfill process of fluoride

A fluoride, stable technology, applied in the field of solid waste treatment, to achieve the effect of simple landfill process and solve the problem of harmless treatment

Inactive Publication Date: 2019-05-17
克拉玛依沃森环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, the present invention provides a landfill process for stabilizing and solidifying fluorides, which can solve the problem of stabilizing and solidifying water-soluble fluorides

Method used

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  • Stabilization landfill process of fluoride

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Effect test

Embodiment 1

[0019] A fluoride stabilization and solidification landfill process, comprising the following steps: 1) adding 30 times the amount of water to the electrolytic aluminum overhaul waste slag based on the weight of the electrolytic aluminum overhaul waste slag, soaking for 1 hour; 2) adding 2% hexahydrate Calcium chloride, stir evenly; 3) Add 0.5‰ polyaluminum chloride, stir evenly, and make a slurry; 4) Cured in the landfill conservation area for 8 days, and the solidified body formed is tested for fluoride ion by using a fluoride ion analyzer. Determination, the measured concentration of fluoride ion is 50.3 mg / L, which is lower than the standard requirement in "Hazardous Waste Identification Standard-Leach Toxicity Identification".

Embodiment 2

[0021] A landfill process for stabilizing fluoride, comprising the following steps: 1) adding 20 times the amount of water to the solid waste based on the weight of the electrolytic aluminum overhaul waste slag, and soaking for 3 hours; 2) adding 6% chlorinated hexahydrate Calcium, stir evenly; 3) Add 1.2‰ polyaluminum chloride, stir evenly, and make a slurry; 4) Curing in the landfill curing area for 14 days, the formed solidified body is measured by fluoride ion analyzer, The measured fluoride ion concentration was 43.5 mg / L, which was lower than the standard requirements in the "Identification Standards for Hazardous Wastes - Identification of Leaching Toxicity".

Embodiment 3

[0023] A fluoride stabilization and solidification landfill process, comprising the following steps: 1) Adding 25 times the amount of water to the solid waste residue based on the weight of the electrolytic aluminum overhaul waste residue, and soaking for 2 hours; 2) Adding 4% chlorinated hexahydrate Calcium, stir evenly; 3) Add 1‰ polyaluminium chloride, stir evenly, and make a slurry; 4) Cured in the landfill curing area for 10 days, and the solidified body formed is measured by fluoride ion analyzer, The measured concentration of fluoride ions was 36.7 mg / L, which was lower than the standard requirement in "Identification Standards for Hazardous Wastes - Identification of Leaching Toxicity".

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PUM

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Abstract

The invention discloses a stabilization landfill process of fluoride. The stabilization landfill process of fluoride comprises the following steps of 1) adding 20-30 times of water into solid waste residue according to the weight of the solid waste residue, and soaking for 1-3 hours; 2) adding 2%-6% of calcium compound, and uniformly stirring; 3) adding 0.5-1.2% of aluminum compound, and uniformlystirring to prepare slurry; and 4) curing for 8-14 days in a landfill curing zone to form a cured body. According to the stabilization landfill process of the fluoride, calcium chloride hexahydrate and polyaluminum chloride (PAC) are adopted as a fluorine removal agent, the fluoride in overhaul slag can be effectively stabilized and cured, so that the cured body formed by the method can leach thetoxic fluoride to meet the requirement of safe landfill.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a fluoride stabilization landfill process. Background technique [0002] In industrial production, especially metallurgical industrial production and various mining production, various fluorine-containing solid / liquid hazardous wastes are inevitably produced while producing various products. How to deal with the environmental protection of these various fluorine-containing solid / liquid hazardous wastes whose fluorine content seriously exceeds the standard is the top priority of the enterprise. For example, in the production process of electrolytic aluminum plants, it is inevitable to produce a large amount of solid waste residue, especially in the process of overhaul, a large amount of waste residues such as spent cathodes and anode carbon blocks containing fluorine will be generated. According to the relevant standards of the People's Republic of China, electrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B1/00B09B3/00
Inventor 赵呈祥温源李伟毛全德
Owner 克拉玛依沃森环保科技有限公司
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