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Treatment method for dangerous solid waste containing fluorosilicate

A treatment method, silicate technology, applied to the removal of solid waste, etc., can solve the problems of surrounding pollution, polluted soil, etc., and achieve the effect of increasing the contact area, avoiding polluted soil, and preventing migration

Pending Publication Date: 2021-09-10
JIAYING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slag dumps containing fluorine-silicate left over from history still continue to cause serious pollution to the surroundings. The concentration of these waste slags contains fluorine-silicate, and the waste slag will pollute the soil during disposal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 200g of fluorine-containing silicate waste residue, and measure the SiF in the waste residue 6 2- The content is 71%. The limestone is pulverized into 40-mesh coarse limestone powder and 100-mesh fine limestone powder, and the mass fraction of calcium carbonate in the limestone powder is ≥90%. In the polystyrene column, fill 300g of 100 mesh fine limestone powder, 200g of waste residue, 40 mesh coarse limestone powder and common soil in sequence. The thickness of the coarse limestone powder layer is 0.2m, and the thickness of the soil layer is 0.5m. Continuously add water with a pH of 6 at the top of the column to make it naturally flow through the soil layer, coarse limestone powder layer, waste residue layer and fine limestone powder layer. The quality of water added is 20 times the total mass of waste residue and fine limestone powder, that is, 10000mL of water. Collect the leachate flowing out from the bottom of the tube, and detect the fluoride ion content e...

Embodiment 2

[0025] Take 1000g of fluorine-containing silicate waste residue, and measure the SiF in the waste residue 6 2- The content is 15%. The limestone is pulverized into 20-mesh coarse limestone powder and 80-mesh fine limestone powder, and the mass fraction of calcium carbonate in the limestone powder is ≥90%. In the polystyrene column, 300g of fine limestone powder of 80 mesh, 1000g of waste residue, coarse limestone powder of 20 mesh and ordinary soil are successively filled, the thickness of the coarse limestone powder layer is 0.1m, and the thickness of the soil layer is 0.2m. Continuously add water with a pH of 8 at the top of the column to make it flow naturally through the soil layer, coarse limestone powder layer, waste residue layer and fine limestone powder layer. . Collect the leachate flowing out from the bottom of the tube, and detect the fluoride ion content every 50mL collected, and detect 200 times in sequence. The fluoride ion concentration of the first 50mL le...

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Abstract

The invention relates to a method for treating dangerous waste residues, in particular to a treatment method for dangerous solid waste containing fluorosilicate. The method comprises the following steps that a raw material cushion layer containing calcium carbonate is formed at the bottom, then a waste residue layer containing fluorosilicate, a raw material middle layer containing calcium carbonate and a soil layer are sequentially laid from bottom to top, and water flows through the soil layer, the middle layer containing the calcium carbonate, the waste residue layer containing the fluorosilicate and the cushion layer containing the calcium carbonate from top to bottom. According to the treatment method, harmless treatment can be carried out on the dangerous solid waste containing the fluorosilicate, a waste residue field with fluorine pollution can be repaired, the calcium carbonate reacts with the dangerous solid waste containing the fluorosilicate to generate non-toxic and water-insoluble calcium fluoride precipitates, fluorine elements in the solid waste and waste residues are effectively removed, fluorine pollution is eliminated, the concentration of fluorine ions in discharged reaction liquid is less than 10 mg / L, and the concentration meets the national sewage comprehensive discharge standard.

Description

technical field [0001] The invention relates to a treatment method for hazardous waste residue, more specifically, it relates to a treatment method for hazardous solid waste containing fluorine-silicate. Background technique [0002] At present, when the domestic industry produces hydrogen fluoride, sodium permanganate, phosphate fertilizer, and fluoride, a large amount of fluorine-containing waste residue is produced, which mainly contains potassium fluorosilicate and sodium fluorosilicate. Sodium fluorosilicate and potassium fluorosilicate are poisonous substances in dangerous chemicals and can be used as insecticides. In slag dumps or waste landfills, under the action of rainwater, fluorosilicate will produce a large amount of fluorine ions, which pose a threat to people's health and environmental safety. When the human body ingests excessive fluoride, it will cause dental fluorosis and bone fluorosis, damage the eyes and nose, and in severe cases, it will lead to lung f...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/00
Inventor 彭梦侠陈梓云
Owner JIAYING UNIV
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