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Material for synchronously stabilizing multiple harmful heavy metals in lead smelting slag

A lead smelting and heavy metal technology, which is applied in the field of synchronously stabilizing materials for various heavy metals, can solve the problems of inability to reduce lead smelting slag efficiently and synchronously, and achieve the effects of reducing leaching toxicity, wide sources, and low preparation cost

Active Publication Date: 2022-04-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are few studies on the stabilization materials for harmful heavy metals in lead smelting slag, and only one literature comparatively reports typical sulfides (Na 2 S·9H 2 O), phosphorus-containing materials (Na 3 PO 4 12H 2 O, (NH 4 ) 2 HPO 4 , Ca(H 2 PO 4 ) 2 ·H 2 O, calcium superphosphate, calcium magnesium phosphate fertilizer), calcium-containing alkaline earth materials (CaO, MgO, dolomite), clay minerals (sodium-based bentonite, attapulgite clay, kaolin) four types of stabilized materials have the effect on Zn, The stabilization effect of Cd and As, the results show that none of the above four types of materials can efficiently and synchronously reduce the harmful Zn, Cd, As in lead smelting slag

Method used

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  • Material for synchronously stabilizing multiple harmful heavy metals in lead smelting slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 200g of lead smelting slag, adding 1.2% slag amount of stabilization material (mass ratio of pyrolusite to converter steel slag=8:2). Mix the stabilized material and lead smelting slag evenly, then add 20% of the total amount of water and mix evenly, put the mixed material into a polyethylene plastic tank, and stabilize at 15°C for 15 days. Then dry it in an oven at 65°C, and then use the horizontal oscillation method to measure the leaching concentrations of harmful As, Zn, Cu, and Cd to be 0.088, 0.769, 0.132, and 0.004mg / L respectively, and the pH of the leach solution is 7.76, and the leach toxicity meets the emission requirements. Require.

Embodiment 2

[0042] Lead smelting slag 200g, add 1.2% slag amount of stabilization materials (mass ratio of pyrolusite to fly ash = 8:2). Mix the stabilized material and lead smelting slag evenly, add 25% of the total amount of water to mix evenly, put the mixed material into a polyethylene plastic tank, and stabilize at an ambient temperature of 20°C for 20 days. Then dry it in an oven at 65°C, and then use the horizontal oscillation method to measure the leaching toxicity of As, Zn, Cu, and Cd to be 0.086, 0.871, 0.141, and 0.003 mg / L respectively, and the pH of the leachate is 7.65, which meets the emission requirements. .

Embodiment 3

[0044] 200g of lead smelting slag, adding 1.5% slag amount of stabilization material (mass ratio of pyrolusite to ferronickel slag=6:4). Mix the stabilized material and lead smelting slag evenly, add 15% of the total amount of water to mix evenly, put the mixed material into a polyethylene plastic tank, and stabilize at 25°C for 40d. Then it was dried in an oven at 65°C. The leaching toxicity of As, Zn, Cu, and Cd measured by the horizontal oscillation method were 0.076, 0.518, 0.132, and 0.004mg / L, respectively, and the pH of the leachate was 7.24. The leaching toxicity met the emission requirements.

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Abstract

The invention provides a synchronous stabilization material for multiple harmful heavy metals in lead smelting slag, and belongs to the technical field of environmental engineering. The material is prepared by taking Ca / Fe-based silicate solid wastes such as converter steel slag, fly ash and ferronickel slag and pyrolusite as raw materials, the prepared stabilized material is mixed with lead smelting slag, and then water is added for uniform mixing, so that harmful heavy metals As, Pb, Zn, Cu and Cd in the slag are subjected to physical and chemical reactions with different components in the stabilized material, and the stable material is obtained. Meanwhile, the leaching toxicity of harmful heavy metal in the lead smelting slag is reduced, migration and diffusion of the harmful heavy metal in the lead smelting slag are retarded, and the pollution risk of water and soil around the slag field is reduced. The stabilized material is wide in raw material source, low in preparation cost, small in dosage and simple to apply.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a material for synchronously stabilizing multiple heavy metals in lead smelting slag. Background technique [0002] my country's lead reserves account for 17.8% of the world's total lead, but provide more than 50% of the world's lead production capacity, resulting in the scale of my country's lead smelting industry ranking first in the world all year round, producing a large number of heavy metals containing As, Zn, Cd, Pb, Lead smelting slag of Cu, Hg, Cr, etc. At present, except for a very small number of resource utilization, most of the lead smelting slags are randomly stored and disposed of in the open air, and most of the storage sites have not been treated for seepage prevention due to historical reasons. The lead smelting slag stored in the open air, due to long-term natural erosion such as weathering corrosion, rainfall and snowfall, the unstable minera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B13/00C22B3/04C22B3/44
CPCC22B7/04C22B7/005C22B7/006C22B13/045C22B3/04C22B3/44Y02P10/20
Inventor 杨慧芬张庆坪郭松孙启伟张鸽倪文姚俊
Owner UNIV OF SCI & TECH BEIJING
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