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Method for producing battery grade nickel sulfate and cobalt sulfate by waste nickel cobalt alloy

A nickel-cobalt alloy and nickel sulfate technology is applied in the preparation of nickel sulfate, cobalt sulfate, and cobalt compounds. It can solve the problems of slow dissolution rate and low nickel leaching efficiency, and achieves low environmental pollution and high metal recovery efficiency. The effect of simple process

Active Publication Date: 2018-10-09
HOHAI UNIV
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  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for producing battery-grade nickel sulfate and cobalt sulfate with waste nickel-cobalt alloy as raw material for the above-mentioned deficiencies in the prior art, so as to overcome the traditional wet recovery process of nickel-cobalt alloy. The leaching efficiency of nickel is not high, the dissolution rate is slow, etc. Electrochemical technology can be used to dissolve nickel, cobalt and other metals in the alloy quickly and easily, and prepare battery-grade nickel sulfate and cobalt sulfate that meet the product quality standards as new energy Battery raw materials, used in the manufacturing field of new energy batteries

Method used

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preparation example Construction

[0047] Step 5. Preparation of nickel sulfate and cobalt sulfate: respectively evaporating the nickel sulfate solution and cobalt sulfate solution prepared in step 4, cooling and crystallizing, and centrifugal dehydration to obtain nickel sulfate and cobalt sulfate.

[0048] There are two methods for cleaning and degreasing the alloy waste in the step 1: one is ultrasonic cleaning, and the temperature is 30-50 ° C; the other is to prepare an alkaline degreasing agent for cleaning, and the degreasing agent is composed of sodium hydroxide, carbonic acid The aqueous solution prepared by sodium or sodium silicate and sodium fatty acid, the cleaning temperature is 40-70 ℃; after degreasing, the alloy waste is washed with water and dried.

[0049] The electrochemical device for dissolving alloy waste in step 2 includes an electrolytic cell, a mesh-shaped titanium cathode and anode titanium basket, a conductive rod, a power supply, and a waste gas collection and treatment system. There...

Embodiment 1

[0055] A nickel-cobalt alloy waste, after testing, its main chemical composition (mass%) includes: Ni46.36, Co14.08, Fe6.22, Cr12.46, Al6.17, rare metals W, Mo, etc. 13.56, with its The method for preparing battery grade nickel sulfate and cobalt sulfate comprises the following steps:

[0056] Step 1. Clean the blocky alloy waste in a constant temperature ultrasonic water bath at 30°C for 10-15 minutes, take it out, rinse it with water, and dry it at room temperature;

[0057] Step 2. Put the dried alloy block into the anode titanium basket of the electrolytic cell, pass the pre-prepared nickel ion concentration of 60g / L and hydrochloric acid concentration of 1.0mol / L into the electrolytic cell, turn on the power supply and adjust the current density at 40- 50mA / cm 2 After electrolysis for 15 minutes, open the liquid inlet and overflow port of the electrolytic cell at the same time, set the solution flow rate to 0.5-1.0 L / min, and the nickel, cobalt, chromium and other metals...

Embodiment 2

[0064] The main chemical composition (mass%) of a nickel-cobalt alloy waste is as follows: Ni62.17, Co10.03, Cr8.90, Al5.10, rare metals W, Mo, Ta, etc. 13.8, and it is used to prepare battery-grade sulfuric acid The nickel and cobalt sulfate process comprises the following steps:

[0065] Step 1. Put the bulk alloy waste in the prepared alkaline degreaser and wash it for 30 minutes at a temperature of 40-50°C. The degreaser is prepared from sodium hydroxide, sodium silicate and sodium fatty acid in a certain proportion solution, after degreasing, the waste material is taken out, rinsed with water, and dried at room temperature;

[0066] Step 2. Put the dried alloy block into the anode titanium basket of the electrolytic cell, pass the pre-prepared nickel ion concentration of 40g / L and sulfuric acid concentration of 1.5mol / L into the electrolytic cell, turn on the power supply and adjust the current density at 30- 40mA / cm2, after 20-30 minutes of electrolysis, open the liquid...

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Abstract

The invention discloses a method for producing battery grade nickel sulfate and cobalt sulfate by waste nickel cobalt alloy. The method comprises the following steps of performing pretreatment on nickel cobalt alloy waste materials; then, performing electrochemical dissolution; removing impurities such as iron, chromium and aluminum from the obtained solution step by step by a chemical method andan extraction method; firstly extracting cobalt from the solution subjected to impurity removal; then extracting nickel; thus respectively obtaining extraction liquid containing cobalt and nickel; after the reverse extraction, obtaining nickel sulfate and cobalt sulfate solution; then, respectively performing evaporation, cooling crystallization, and centrifugal dewatering on the solution to obtain a product of the battery grade nickel sulfate and cobalt sulfate. The problems of low nickel and cobalt leaching efficiency, low dissolution speed and the like in the waste nickel and cobalt alloy recovery process by a conventional wet process can be effectively solved; the battery grade nickel sulfate and cobalt sulfate conforming to the product quality standard requirement can be produced, andcan be used as a new energy source battery raw material to be applied to the field of new energy source battery manufacturing. The process is simple; the environment pollution is low; the metal recovery rate is high; good practical values and economic values are realized.

Description

technical field [0001] The invention belongs to the field of recycling and comprehensive utilization of waste metal resources, and relates to a new technology for recycling waste nickel-cobalt alloys, in particular to a method for producing battery-grade nickel sulfate and cobalt sulfate from waste nickel-cobalt alloys. technical background [0002] Under the current dual pressure and background of resource depletion, energy conservation and emission reduction facing the world, it has become the basic consensus of international energy development and economic transformation to vigorously develop new energy and follow the path of low-carbon economic development. With the rapid development of my country's national economy and the intensification of urbanization, the promotion and popularization of new energy instead of traditional fossil fuel-driven vehicles has become an important way to reduce urban pollution and improve ambient air quality. A major direction of my country's ...

Claims

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Application Information

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IPC IPC(8): C01G51/10C01G53/10C25F3/02
CPCC01G51/003C01G51/10C01G53/003C01G53/10C25F3/02
Inventor 李继洲韩孟雨陈浩宋垠先
Owner HOHAI UNIV
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