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A method for joint treatment of copper slag and chromium slag

A combined treatment and copper slag technology, applied in the field of smelting, can solve the problems of environmental pollution, resource waste, land occupation, etc.

Active Publication Date: 2017-12-15
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] my country's copper production ranks first in the world. In the process of copper production, a large amount of copper slag is produced. The copper slag is piled up in the slag yard, which not only occupies land but also pollutes the environment, and is a huge waste of resources.

Method used

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  • A method for joint treatment of copper slag and chromium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1, 100 parts of copper slag (Fe: 41.2%, SiO 2 : 31.5%), 32 parts of calcium chrome slag (CaO: 25.5%), 22 parts of reduced coal (C: 80.8%, S: 0.6%), 3 parts of fluorite (CaF 2 : 82.3%), 5 parts of bentonite were dried at 110° C., then finely ground to below 200 mesh and mixed to obtain a mixture.

[0037] Step 2. The mixture obtained in Step 1 is pressed into pellets with a particle size of 50mm, and the prepared pellets are dried at 105° C. to obtain dry pellets.

[0038] Step 3, put the dry pellets obtained in step 3 and 5% quicklime (CaO: 88.2%) of the dry pellet mass, the quicklime particle size 50mm, into the electric furnace for melting, and refine for 40 minutes after melting to obtain ferrosilicon and detoxification slag.

Embodiment 2

[0040] Step 1, 100 parts of copper slag (Fe: 42.3%, SiO 2 : 32.2%), 35 parts of calcium chrome slag (CaO: 28.5%), 25 parts of reduced coal (C: 85.8%, S: 0.5%), 8 parts of fluorite (CaF 2 : 83.3%), 3 parts of bentonite were dried at 110°C, then finely ground to below 200 mesh and mixed to obtain a mixture.

[0041] Step 2. The mixture obtained in Step 1 is pressed into pellets with a particle size of 20mm, and the prepared pellets are dried at 105° C. to obtain dry pellets.

[0042] Step 3. Put dry pellets obtained in step 3 and 15% quicklime (CaO: 82.2%) of dry pellet mass, quicklime particle size 40mm, into an electric furnace for melting, and refine for 20 minutes after melting to obtain ferrosilicon and detoxification slag.

Embodiment 3

[0044] Step 1, 100 parts of copper slag (Fe: 43.5%, SiO 2 : 34.5%), 50 parts of calcium chrome slag (CaO: 27.6%), 35 parts of reduced coal (C: 82.5%, S: 0.5%), 5 parts of fluorite (CaF 2 : 83.2%), 8 parts of bentonite were dried at 110° C., then finely ground to below 200 mesh and mixed to obtain a mixture.

[0045] Step 2. The mixture obtained in Step 1 is pressed into pellets, and the particle size of the pellets is 2 mm, and the prepared pellets are dried at 105° C. to obtain dry pellets.

[0046] Step 3, put the dry pellets obtained in step 3 and 20% quicklime (CaO: 85.2%) of the dry pellet mass, the quicklime particle size is 20mm, into an electric furnace for melting, and refine for 30 minutes after melting to obtain ferrosilicon and detoxification slag.

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Abstract

The invention discloses a method for combined treatment of copper slags and chromium slags. The method comprises the following steps that A, copper slags, calcium-contained chromium slags, reduction coal, fluorite and bentonite are dried under the temperature lower than 150 DEG C, finely ground to 200 meshes or below, and mixed to be uniform to obtain a mixture; B, the mixture is pressed into balls, and the obtained balls are dried to obtain dry balls; C, the dry balls and quick lime are molten in an electric furnace, refining is performed after melting down, and ferrosilicon and detoxicated slags are obtained. According to the method for combined treatment of copper slags and chromium slags, copper slags, calcium-contained chromium slags, reduction coal, fluorite, bentonite and quick lime are adopted as raw materials, and ferrosilicon and detoxicated slags are obtained; Cr6+ in chromium slags is detoxicated thoroughly, and copper slags and calcium-contained chromium slags are comprehensively recycled.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a method for jointly treating copper slag and chromium slag. Background technique [0002] Calcium-chromium slag is the waste produced by chromium ore with calcium roasting process. In addition to calcium, magnesium, iron, silicon, aluminum and other elements, it also contains a certain amount of chromium. Its water-soluble and acid-soluble Cr 6+ (Hexavalent chromium) is highly toxic and will cause continuous pollution to the surrounding ecological environment. [0003] Chromium slag is leached by rainwater, sewage overflows and infiltrates, water-soluble sodium chromate, acid-soluble calcium chromate and other hexavalent chromium ions cause varying degrees of pollution hazards to groundwater, rivers and sea areas, etc., resulting in animal death, agricultural production reduction and human health. the occurrence of disease. Toxic chromium compounds can also cause ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B4/06C22C35/00B09B3/00
CPCB09B3/00C22B4/06C22C35/00Y02P10/20
Inventor 徐刚任中山闫方兴曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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