Industrial method for selectively recycling copper and nickel from copper-nickel mud

An industrial method and selective technology, applied in the field of non-ferrous metal resource recycling, can solve the problems of complex composition of copper-nickel sludge, high impurity content, high processing cost, etc., to prevent the overflow and leakage of acid mist, simplify the operation process, improve the The effect of recovery

Active Publication Date: 2015-03-04
浙江科菲科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex composition and high impurity content of these copper-nickel sludge, if the copper is purified according to the traditional process, the production process will be long and the processing cost will be high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: The appearance of the selected copper-nickel mud is blue-green, mud-like, and the water content is 54%. The main metal element content of drying sampling analysis is as follows:

[0027] elementCu Ni Fe MgCr Cd %35.9711.120.960.520.860.03 element Ca Pb Co Bi Mn Zn % / / 0.140.080.090.97

[0028] Proceed as follows:

[0029] Weigh 500g of the above dry copper-nickel mud, add 1.5L of distilled water to slurry, then slowly add 190ml of concentrated sulfuric acid, control the reaction temperature to 80℃, the pH of the solution is 2.0, and the leaching time is 2 hours; the leachate is precision filtered, and the filtrate is added with water Dilute to 4L and enter the cyclone electrolyzer to remove copper, control the electrowinning temperature to 30℃, and the current density to 200-400A / m 2 , The electrolyte flow rate is 400L / h, the electrowinning time is 5-7 hours, and the copper tube is obtained on the cathode starting electrode. The copper content of the copper r...

Embodiment 2

[0031] Weigh 500g of dry nickel mud, add 2L of distilled water to slurry, then slowly add 195ml of concentrated sulfuric acid, control the reaction temperature to 90℃, the pH of the solution is 3.5, and the leaching time for 1 hour; the leaching solution is precision filtered and the filtrate enters the cyclone electrolysis To remove copper from the tank, control the electrowinning temperature to 65°C, and the current density 400-700A / m 2 , The electrolyte flow rate is 600L / h, the electrowinning time is 2-5 hours, and the copper tube is obtained on the cathode starting electrode. The copper-removed liquid contains 0.2g / L of copper; the copper-removed liquid passes through the heat exchanger and uses The industrial water is cooled, and the temperature of the solution is reduced from about 65°C to the industrial water temperature. Secondly, the low temperature brine at -15°C is passed through the heat exchanger to further cool the final copper removal solution after the heat exchan...

Embodiment 3

[0033] Weigh 500g of dry nickel mud, add 2L of distilled water to slurry, then add the crystallization filtrate in Example 2, then add concentrated acid, control the reaction temperature to 60℃, the pH of the solution is 0.5, and the leaching time is 5 hours; Precise filtration, the filtrate enters the cyclone electrolytic cell to remove copper, the electrowinning temperature is controlled to 50℃, and the current density is 500-600A / m 2 , The electrolyte flow rate is 500L / h, the electrowinning time is 4 hours, and the copper tube is obtained on the cathode starter piece. The copper-removed liquid contains 0.3g / L of copper; the copper-removed liquid passes through the heat exchanger and uses industrial water Perform cooling, reduce the temperature of the solution from about 50°C to industrial water temperature, and then pass the low temperature brine at -15°C through the heat exchanger to further cool the final copper removal solution after the heat exchanger is cooled, and then p...

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PUM

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Abstract

The invention discloses an industrial method for selectively recycling copper and nickel from copper-nickel mud, belonging to the field of recycling non-ferrous metal resources. The industrial method comprises the following steps of: acid-leaching the copper-nickel mud; filtering leachate; punching the leachate to a sealed tubular slot from a circulating slot under the action of a circulating pump, rotating the solution in the slot at a high speed, and carrying out rotational flow electrolysis to remove the copper; returning electrodeposited solution to the leaching process for continuously carrying out leaching; and gathering the nickel in the copper-nickel mud for preparing nickel sulfate. According to the industrial method provided by the invention, an high-speed rotation electrolytic technology for a solution in an electrolytic cell is combined with other processes to recycle the metal in the solution for being continuously used for other industries, so that the waste material is changed into things of value for realizing recycling the resources; the current density and the current efficiency are high, the reagent consumption is low, the production cost is reduced, and performances of the enterprise are improved. Meanwhile, the solution is circulated in a closed-loop manner, so that no harmful gases are exhausted, and the existing circular economy and environmental protection theories are satisfied.

Description

Technical field [0001] The invention belongs to the field of recycling and utilization of non-ferrous metal resources, and specifically relates to an electrolysis technology that is efficient, reliable, simple in process flow, simple in operation, and low in cost to process copper and nickel mud electrowinning and recover copper and nickel. Background technique [0002] my country is the world's largest copper consumer, and its annual copper consumption accounts for about 21% of the total global consumption. However, my country is not a big resource of copper minerals. Copper reserves account for 5% of the world. With its own strength alone, China cannot maintain 21% consumption with 5% resources. A realistic and feasible way to alleviate this phenomenon is to actively use copper scrap resources to achieve sustainable copper development. [0003] As an important material for the national economy and national defense construction, nickel is also a supporting material for high-tech ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B23/00C25C1/12
CPCY02P10/20
Inventor 邓涛吴燕沈李奇侯新常林元吉门海芬佟永明
Owner 浙江科菲科技股份有限公司
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