High-temperature melting and solidifying method for heavy metal sludge

A technology of heavy metal sludge, high temperature melting, applied in chemical instruments and methods, sludge treatment, fixed/solidified sludge treatment, etc. The effect of high utilization efficiency, high stability and low leaching rate

Inactive Publication Date: 2016-05-04
KUNMING UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the medium and long-term stability and potential risks of the solidified body in this disposal method need to be further studied

Method used

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  • High-temperature melting and solidifying method for heavy metal sludge
  • High-temperature melting and solidifying method for heavy metal sludge
  • High-temperature melting and solidifying method for heavy metal sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Such as figure 1 As shown, the heavy metal sludge high-temperature melting solidification method, its specific steps are as follows:

[0020] (1) First, add 1% of the weight of the natural air-dried heavy metal sludge to the natural air-dried heavy metal sludge (see Table 1 for the composition of the heavy metal sludge) and mix it with ball mill until the particle size is 2 ;

[0021] Table 1 Chemical composition of arsenic-containing heavy metal sludge (%)

[0022]

[0023] (2) Dry the ball-milled material obtained in step (1) for 3 hours at a temperature of 100° C. using the waste heat of flue gas;

[0024] (3) Heat the material dried in step (2) to a temperature of 1000°C and melt it at a high temperature for 3 hours. The flue gas generated during this process is dedusted and returned to step (2) for drying and ball milling. The temperature of the material is reduced to 50°C Post-washing (washing with a sodium hydroxide solution with a concentration of 3mol / l fo...

Embodiment 2

[0033] Such as figure 1 As shown, the heavy metal sludge high-temperature melting solidification method, its specific steps are as follows:

[0034] (1) First, add 10% of the weight of the natural air-dried heavy metal sludge to the natural air-dried heavy metal sludge (the composition of the heavy metal sludge is shown in Table 4) and mix it with ball mill until the particle size is 2 ;

[0035] Table 4 Chemical composition of arsenic-containing heavy metal sludge (%)

[0036]

[0037] (2) Dry the ball-milled material obtained in step (1) for 0.1 h at a temperature of 800° C. using the waste heat of flue gas;

[0038] (3) Heat up the material dried in step (2) to a temperature of 1400°C and melt it at high temperature for 0.1 hour. The flue gas generated during this process is dedusted and returned to step (2) for drying and ball milling. The temperature of the material drops to 80 After washing at ℃ (using a sodium hydroxide solution with a concentration of 3mol / L for 0...

Embodiment 3

[0047] Such as figure 1 As shown, the heavy metal sludge high-temperature melting solidification method, its specific steps are as follows:

[0048] (1) First, add 15% of the weight of the natural air-dried heavy metal sludge to the natural air-dried heavy metal sludge (see Table 7 for the composition of the heavy metal sludge) and mix it with ball mill until the particle size is 2 ;

[0049] Table 7 Chemical composition of arsenic-containing heavy metal sludge (%)

[0050]

[0051](2) Drying the ball-milled material obtained in step (1) for 1.5 hours at a temperature of 500° C. using waste heat of flue gas;

[0052] (3) Heat up the material dried in step (2) to a temperature of 1200°C and melt it at high temperature for 1.5 hours. The flue gas generated during this process is dedusted and returned to step (2) for drying and ball milling. The temperature of the material drops to 100°C After washing at ℃ (with a concentration of 3mol / L sodium hydroxide solution, wash for 1...

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Abstract

The invention relates to a high-temperature melting and solidifying method for heavy metal sludge, and belongs to the technical field of chemical industry and environment protection. The method comprises the following steps: adding an additive of which the mass is 1 to 15 percent of that of naturally dried heavy metal sludge into the naturally dried heavy metal sludge first, mixing and performing ball grinding until the particle size is less than 1 mm to obtain a ball grinding material; drying the obtained ball grinding material for 0.1 to 3 hours under the temperature of 100 to 800 DEG C by adopting flue gas waste heat; heating the material which is subjected to drying treatment to the temperature of 1,000 to 1,400 DEG C, and melting for 0.1 to 3 hours at a high temperature; performing dust removal on the flue gas generated in the process, returning the flue gas until the temperature of the dried ball grinding material is reduced to 50 to 100 DEG C, washing the flue gas, and finally discharging the flue gas until the flue gas reaches standards; pouring and molding the molten and solidified product to obtain a solidified body. By the method, the leaching toxicity of the obtained molten and solidified body reaches the standard of common solid waste; the molten and solidified body has the advantages of high strength, high volume reduction rate, high long-term stability, and thorough solidification.

Description

technical field [0001] The invention relates to a method for high-temperature melting and solidification of heavy metal sludge, which belongs to the technical field of chemical industry and environmental protection. Background technique [0002] At present, non-ferrous heavy metal smelting is mainly based on pyrometallurgy, and heavy metal pyrometallurgy mostly uses flue gas washing to remove impurities in the flue gas, which in turn produces a large amount of acidic heavy metal wastewater, which is passed through lime-iron salt After treatment by neutralization method or neutralization method, it is converted into standard industrial water, and the arsenic (As) and other heavy metal elements associated with heavy metal minerals all enter the neutralization slag (heavy metal sludge) through neutralization and precipitation. Therefore, the non-ferrous heavy metal smelting industry produces millions of tons of such heavy metal sludge every year. In the toxicity leaching experi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12
CPCC02F11/00C02F11/008C02F11/12
Inventor 王华王冲祝星尤开云祁先进惠兴欢赵占冲周尚魏永刚胡建杭
Owner KUNMING UNIV OF SCI & TECH
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