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Method for preparing high-purity copper chloride dehydrate by regulating and controlling copper-containing sludge through SiO2

A technology of copper chloride dihydrate, copper sludge, applied in copper chloride, copper halide, nanotechnology for materials and surface science, etc., can solve secondary pollution, high energy consumption, and poor purity of copper chloride. Advanced problems, to achieve the effect of saving usage, short process and saving reaction raw materials

Inactive Publication Date: 2020-04-10
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] In order to overcome the deficiencies such as high energy consumption and secondary pollution existing in the prior art, and the problem that the purity of the product cupric chloride is not high, the object of the present invention is to provide a 2 Method for preparing high-purity copper chloride dihydrate by regulating copper-containing sludge

Method used

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  • Method for preparing high-purity copper chloride dehydrate by regulating and controlling copper-containing sludge through SiO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Place copper-containing sludge in an oven, dry at 105°C for 12 hours, grind, and pass through a 100-mesh sieve. Get the copper-containing sludge after 2g drying, add the concentrated hydrochloric acid of 3.0ml 36wt.% and 0.2g SiO 2 , stir well.

[0029] (2) Put the evenly stirred mixture in a tube furnace (the tube furnace has a built-in quartz tube, the air inlet and the gas outlet are respectively connected to the two ends of the quartz tube, the middle part of the quartz tube is the heating area, and the two ends are the low-temperature condensation area ; the gas outlet is connected to the gas washing bottle for tail gas absorption), in an air atmosphere with a flow rate of 6m / min, the temperature is raised to 700°C for 120min at a heating rate of 10°C / min, and the product CuCl is recovered in the low-temperature condensation zone of the tube furnace after cooling 2 2H 2 O, the recovery efficiency of copper is calculated to be 86.62.%.

Embodiment 2

[0031] (1) Place the copper-containing sludge in an oven, dry at 105°C for 10 hours, grind, and pass through a 100-mesh sieve. Get the copper-containing sludge after 2g drying, add the concentrated hydrochloric acid of 3.0ml 36wt.% and the SiO of 0.2g 2 , stir well.

[0032] (2) Put the evenly stirred mixture in a tube furnace (the tube furnace has a built-in quartz tube, the air inlet and the gas outlet are respectively connected to the two ends of the quartz tube, the middle part of the quartz tube is the heating area, and the two ends are the low-temperature condensation area ; the gas outlet is connected to the gas washing bottle for tail gas absorption), in an air atmosphere with a flow rate of 5m / min, the temperature is raised to 800°C for 60min at a heating rate of 10°C / min, and the product CuCl is recovered in the low-temperature condensation zone of the tube furnace after cooling 2 2H 2 O, the recovery efficiency of copper is calculated to be 96.80%, and its purity ...

Embodiment 3

[0035] (1) Place the copper-containing sludge in an oven, dry at 105°C for 10 hours, grind, and pass through a 100-mesh sieve. Get the copper-containing sludge after 4g drying, add the concentrated hydrochloric acid of 4.0ml 36wt.% and the SiO of 0.4g 2 , stir well.

[0036](2) Put the evenly stirred mixture in a tube furnace (the tube furnace has a built-in quartz tube, the air inlet and the gas outlet are respectively connected to the two ends of the quartz tube, the middle part of the quartz tube is the heating area, and the two ends are the low-temperature condensation area ; The gas outlet is connected to the gas washing bottle for tail gas absorption), and the temperature is raised to 800°C at a heating rate of 10°C / min under an air atmosphere with a flow rate of 6m / min. After being roasted for 120min, the product CuCl is recovered in the low-temperature condensation zone of the tube furnace 2 2H 2 O, the recovery efficiency of copper is calculated to be 95.20%, and it...

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Abstract

The invention belongs to the technical field of solid waste treatment, and discloses a method for preparing high-purity copper chloride dehydrate by regulating and controlling copper-containing sludgethrough SiO2. The method comprises the following steps: drying, grinding and sieving the copper-containing sludge, adding SiO2 and hydrochloric acid according to a certain ratio and uniformly stirring; and roasting the obtained mixture in a flowing air atmosphere at the temperature of 700-1200 DEG C and condensing the volatilized product to obtain CuCl2. 2H2O. With application of the method, 95-97% of copper in the copper-containing sludge can be recovered and the purity of the prepared product is about 95%. The method is simple in process, small in secondary pollution and high in product application value; the method is a breakthrough in the technical field of heavy metal waste residue recycling, solves the problems of complex process, high cost, high secondary pollution and the like ofthe copper extraction technology of the copper-containing sludge, provides a new thought for preparation of copper chloride dehydrate and heavy metal recovery of other heavy metal waste residues and is remarkable in environmental and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, in particular to a 2 A method for preparing high-purity copper chloride dihydrate by regulating copper-containing sludge. Background technique [0002] Copper-containing sludge is included in the "National Hazardous Waste List" (HW22) due to its high content of heavy metals. Its average copper content is generally 3-7%, and some even as high as 15%. Its essence is electroplating with high copper content. sludge. Recovering copper from copper-containing sludge is of great significance both from the perspective of environmental protection and sustainable development. [0003] The Chinese patent "An energy-saving and environmentally friendly copper-containing sludge smelting method" (CN201910688422.5) is to mix and granulate copper-containing sludge with lime and anthracite, and then add limestone coke for reduction smelting after sintering, and finally obtain black copper or Matte ...

Claims

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Application Information

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IPC IPC(8): C01G3/05B82Y30/00C22B7/00
CPCC01G3/05B82Y30/00C22B7/002C01P2006/80Y02P10/20
Inventor 林璋于垚刘学明吴榛
Owner SOUTH CHINA UNIV OF TECH
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