A method for harmless disposal of high-arsenic heavy metal sludge

A technology for heavy metal sludge and disposal methods, applied in sludge treatment, chemical instruments and methods, fixed/solidified sludge treatment, etc., can solve the problems of high cost, unstable leaching toxicity, etc., and achieve loose storage conditions and solidification Good effect and low curing cost

Active Publication Date: 2018-12-14
YUNNAN COPPER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although the solidification of arsenic-containing waste slag cement can also meet the technical requirements, for high-arsenic heavy metal sludge, there are factors such as high cost and unstable leaching toxicity of cement solidification alone.

Method used

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  • A method for harmless disposal of high-arsenic heavy metal sludge
  • A method for harmless disposal of high-arsenic heavy metal sludge
  • A method for harmless disposal of high-arsenic heavy metal sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, the harmless disposal method of high-arsenic heavy metal sludge, its specific steps are as follows:

[0022] (1) Pre-calcination: Firstly, the high-arsenic heavy metal sludge with a moisture content of <40% (the main physical and chemical properties of the high-arsenic heavy metal sludge are shown in Table 1 and the leaching toxicity is shown in Table 2) at a temperature of 300°C. Calcined for 3h to obtain a calcined product;

[0023] Table 1

[0024]

[0025] (2) Ingredients: The calcined product obtained in step (1) is added with additives and lime according to the mass ratio of 80:12:8 and stirred evenly to obtain a mixed material; the additive is di Silica powder, bismuth trioxide (Bi 2 o 3 ), boron oxide (B 2 o 3 ), calcium oxide (CaO) and zinc oxide (ZnO) mixture; use a planetary mixer for stirring;

[0026] (3) Mold the mixed material obtained in step (3) to produce a solidified body, and store it safely after cooling; the mol...

Embodiment 2

[0032] Such as figure 1 As shown, the harmless disposal method of high-arsenic heavy metal sludge, its specific steps are as follows:

[0033] (1) Pre-calcination: Firstly, the high-arsenic heavy metal sludge with a moisture content of <40% (the main physical and chemical properties of the high-arsenic heavy metal sludge are shown in Table 3 and the leaching toxicity is shown in Table 4) at a temperature of 250°C. Calcined for 2h to obtain a calcined product;

[0034] table 3

[0035]

[0036] (2) Ingredients: Add additives and lime to the calcined product obtained in step (1) according to the mass ratio of 75:17:8 and stir evenly to obtain a mixed material; the additive is carbon dioxide with a mass ratio of 20:40:20:10:10 Silicon fume, bismuth trioxide (Bi 2 o 3 ), boron oxide (B 2 o 3 ), calcium oxide (CaO) and zinc oxide (ZnO) mixture; use a planetary mixer for stirring;

[0037] (3) Mold the mixed material obtained in step (3) to produce a solidified body, and s...

Embodiment 3

[0043] Such as figure 1 As shown, the harmless disposal method of high-arsenic heavy metal sludge, its specific steps are as follows:

[0044] (1) Pre-calcination: Firstly, the high-arsenic heavy metal sludge with a moisture content of <40% (the main physical and chemical properties of the high-arsenic heavy metal sludge are shown in Table 5 and the leaching toxicity is shown in Table 6) at a temperature of 250°C. Calcined for 1h to obtain a calcined product;

[0045] table 5

[0046]

[0047] (2) Ingredients: The calcined product obtained in step (1) is added with additives and lime according to the mass ratio of 70:20:10 and stirred evenly to obtain a mixed material; the additive is carbon dioxide with a mass ratio of 20:20:40:10:10 Silicon fume, bismuth trioxide (Bi 2 o 3 ), boron oxide (B 2 o 3 ), calcium oxide (CaO) and zinc oxide (ZnO) mixture; use a planetary mixer for stirring;

[0048] (3) Mold the mixed material obtained in step (3) to produce a solidified bo...

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Abstract

The invention relates to a harmless disposal method for high-arsenic heavy metal sludge and belongs to the technical field of hazardous waste treatment. The harmless disposal method comprises the following steps of firstly, precalcining the high-arsenic heavy metal sludge with water content of less than 40 percent under the condition that the temperature is 100 to 300DEG C for 0.5 to 3 hours to obtain a calcined product; adding lime and additives into the obtained calcined product according to the mass ratio of (30 to 80): (10 to 40):(1 to 30), and uniformly stirring to obtain a mixed material; forming the obtained mixed material to produce a solidified body, cooling and then safely storing. According to the sludge disposed by the harmless disposal method, leaching concentrations of all heavy metal elements meet the requirements of Identification Standard and Leaching Toxicity Identification of Hazardous Waste (GB5085.3-2007) and Landfill Pollution Control Standard for Hazardous Waste (GB18598-2001).

Description

technical field [0001] The invention relates to a method for harmless disposal of high-arsenic heavy metal sludge, belonging to the technical field of hazardous waste treatment. 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 (arsenic-containing 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 experiment, arsenic, lead...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00
CPCC02F11/00C02F11/008
Inventor 史谊峰王华惠兴欢祝星王冲祁先进张福长赵占冲王晓武魏永刚胡建杭
Owner YUNNAN COPPER CO LTD
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