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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 mud, high impurity content, long production process, etc., to prevent acid mist overflow and leakage, simplify operation process, improve The effect of recovery

Active Publication Date: 2013-03-27
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] Embodiment 1: The appearance of the selected copper-nickel mud is blue-green, muddy, and the water content is 54%. Drying and sampling analysis of the main metal element content is as follows:

[0027] element Cu Ni Fe Mg Cr Cd % 35.97 11.12 0.96 0.52 0.86 0.03 element Ca Pb co Bi mn Zn % / / 0.14 0.08 0.09 0.97

[0028] Proceed as follows:

[0029] Weigh 500g of the above dried copper-nickel slime, add 1.5L of distilled water to make a slurry, then slowly add 190ml of concentrated sulfuric acid, control the reaction temperature to 80°C, the pH value of the solution to 2.0, and the leaching time for 2 hours; fine-filter the leachate, add water to the filtrate Dilute to 4L and enter the cyclone electrolyzer to remove copper, control the electrowinning temperature to 30°C, and the current density to 200-400A / m 2 , the flow rate of the electrolyte is 400L / h, the electrolysis time is 5-7 hours, and a copper tube ...

Embodiment 2

[0031] Weigh 500g of dried nickel slime, add 2L of distilled water to slurry, then slowly add 195ml of concentrated sulfuric acid, control the reaction temperature to 90°C, the pH value of the solution to 3.5, and the leaching time for 1 hour; filter the leaching solution precisely, and the filtrate enters the cyclone electrolysis Remove copper in the tank, control the electrodeposition temperature to 65°C, and the current density to 400-700A / m 2 , the electrolyte flow rate is 600L / h, and the electrowinning time is 2-5 hours. A copper tube is obtained on the cathode starting plate, and the copper-removing liquid contains 0.2g / L of copper; the copper-removing liquid passes through the heat exchanger and is used The industrial water is cooled, and the temperature of the solution is reduced from about 65°C to the industrial water temperature, followed by -15°C low-temperature brine through the heat exchanger to further cool the decoppered final liquid after the heat exchanger is c...

Embodiment 3

[0033] Weigh 500 g of dried nickel slime, add 2L of distilled water to make slurry, then add the crystallization filtrate in Example 2, then add concentrated acid, control the reaction temperature to be 60°C, the pH value 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 at 50°C, and the current density is 500-600A / m 2 , the electrolyte flow rate is 500L / h, and the electrowinning time is 4 hours. A copper tube is obtained on the cathode starting plate, and the copper-removing liquid contains 0.3g / L of copper; For cooling, the temperature of the solution is lowered from about 50°C to industrial water temperature, and then the final decopper liquid after cooling by the heat exchanger is further cooled by the low-temperature brine at -15°C through the heat exchanger, and then passed through the freezing crystallization tank at -18 Under the ...

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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 nonferrous metal resources, and specifically relates to an electrolysis technology for treating copper-nickel slime and recovering copper and nickel by electrowinning with high efficiency, reliability, simple process flow, simple operation and low cost. Background technique [0002] my country is the world's largest copper consumer, and its annual copper consumption accounts for about 21% of the world's total consumption. However, my country is not a country rich in copper mineral resources. Copper reserves account for 5% of the world's total. Relying on its own strength alone, China cannot use 5% of its resources to maintain 21% of its consumption. A realistic and feasible way to alleviate this phenomenon is to actively use waste copper resources to achieve sustainable development of copper. [0003] As an important material for national economy and national defense construction, nick...

Claims

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Application Information

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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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