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Treatment method of copper smelting sludge

A copper smelting sludge and treatment method technology, which is applied in sludge treatment, fixed/solidified sludge treatment, water/sludge/sewage treatment, etc., can solve problems such as complex process, high cost, and unsatisfactory solidification effect. Achieve the effect of simple process and low processing cost

Inactive Publication Date: 2020-05-29
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The five curing forms have their own advantages and disadvantages. In general, the curing effect is not ideal with simple process and low cost, and the volume increase is also large; the process with complex process and good effect requires professionals and equipment, and the cost is high.
This invention comprehensively treats a variety of heavy metals in copper smelting sludge, but the process is complicated and the cost is high
[0011] CN103011738A discloses a solidification method of copper sludge, which uses metallurgical industry copper sludge, fly ash, cement, Isa slag, etc. The finished product makes full use of the waste resources in the metallurgical industry, but only uses the adsorption of fly ash and the solidification properties of cement and other materials, so it needs to add a relatively high proportion of fly ash and cement and other raw materials, and the volume increases greatly
[0017] It can be seen that in the above-mentioned existing methods for processing copper smelting sludge, most of them are used to extract heavy metals in copper smelting sludge, and there are few treatment methods for the purpose of harmlessness. It is imminent to use a variety of industrial solid wastes to harmlessly treat copper smelting sludge

Method used

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  • Treatment method of copper smelting sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] For a non-ferrous metal company, the leaching toxicity test of copper smelting sludge before and after treatment is shown in Table 1:

[0044] Table 1 Sludge leaching toxicity of a non-ferrous metal company before and after treatment

[0045]

[0046] Dilute the sludge by 4 times, add red mud to adjust its pH to 9, add red mud at a ratio of 1:1.5, add slag and desulfurized gypsum at a ratio of 10:1, and add carboxymethyl cellulose at a ratio of 100:1 , press-molded with a pressure of 25mPa and maintained for 30 hours, and the leaching toxicity of heavy metals was detected. The leaching toxicity is reduced by 82%, and the Hg leaching toxicity is reduced by 95%.

Embodiment 2

[0048] For a copper smelting factory, the leaching toxicity test before and after treatment of the copper smelting factory is shown in Table 2:

[0049] Table 2 Toxicity of sludge leaching before and after treatment in a copper smelting plant

[0050]

[0051] Dilute the sludge by 3 times, add red mud to adjust its pH to 9.5, add red mud at a ratio of 1:1, add slag at a ratio of 5:1, add desulfurized gypsum at a ratio of 10:1, and add slag at a ratio of 150:1 Add polyvinyl alcohol in proportion, press molding with a pressure of 30mPa and maintain for 24 hours, and detect its heavy metal leaching toxicity. 59.95% reduction, Zn leaching toxicity reduction 80.90%, Cd leaching toxicity reduction 83.48%, Hg leaching toxicity reduction 42.86%.

Embodiment 3

[0053] For a copper smelting enterprise, the leaching toxicity test of copper smelting sludge before and after treatment is shown in Table 3:

[0054] Table 3 Sludge leaching toxicity of a copper smelting enterprise before and after treatment

[0055]

[0056] Dilute the sludge by 2 times, add red mud to adjust its pH to 10, add red mud at a ratio of 1:1, add slag and desulfurized gypsum at a ratio of 5:1, add cement at a ratio of 100:1, and use 20mPa The pressure was pressed and maintained for 20 hours, and the heavy metal leaching toxicity was detected. The results are shown in Table 3. It can be seen from the table that Cu leaching toxicity decreased by 59.91%, As leaching toxicity decreased by 93.17%, Pb leaching toxicity decreased by 85.19%, and Zn leaching toxicity decreased by 62.63%. %, Cd leaching toxicity decreased by 80.36%, and Hg leaching toxicity decreased by 89.66%.

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Abstract

The invention discloses a treatment method of copper smelting sludge, and relates to a comprehensive utilization and environment-friendly treatment method of copper smelting sludge. The method is characterized in that in the treatment process, the copper smelting sludge is mixed with red mud, slag, desulfurized gypsum and an additive, and compression molding and maintenance are conducted to form asludge solidified body. According to the treatment method disclosed by the invention, the copper smelting sludge diluted by adding water is subjected to pH regulation pretreatment by utilizing strongbasicity of the red mud, and sludge slurry is regulated to be alkaline so as to precipitate most heavy metal ions; the viscosity, the adsorbability and the plasticity of the red mud are utilized, andare combined with the slag, desulfurized gypsum and the additive to solidify the pretreated copper smelting sludge, and heavy metals and arsenic in the sludge are subjected to innocent treatment in manners of forming hydroxides, adsorbing, physically wrapping, forming calcium arsenate and the like to finally obtain the sludge solidified body with certain mechanical strength. The purposes of solidifying arsenic ions and heavy metal ions such as Cu and Hg and converting the copper smelting sludge from dangerous solid waste into general solid waste are achieved, waste is treated with waste, andthe environmental protection cost is reduced.

Description

technical field [0001] A method for treating copper smelting sludge relates to a method for comprehensive utilization and environmental protection of copper smelting sludge. Background technique [0002] Lime-iron salt method is widely used in copper smelting plants to treat acid wastewater, which produces a large amount of copper smelting sludge containing arsenic, Cu, Hg and other heavy metals. These heavy metal compounds are very unstable, and it is easy to release heavy metal ions in storage. At present, copper smelting sludge has been included in the list of hazardous wastes as copper-containing wastes and mercury-containing wastes, and its arsenic ion leaching toxicity far exceeds the "National Standard of the People's Republic of China- Hazardous Waste Identification Standards Leach Toxicity Identification" (GB5085.3-2007 ) standards, professional institutions are required for processing, and the disposal cost is relatively high. [0003] At present, the treatment m...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F101/10C02F101/20
CPCC02F11/008C02F2101/20C02F2101/103
Inventor 孙凤娟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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