Method for preparing electronic-grade nickel sulfate from nickel powder, crystallization device and control method of crystallization device

A crystallization device, technology of nickel sulfate, applied in the direction of crystallization adjustment/control, nickel sulfate, solution crystallization, etc., can solve the problems of increasing production cost and unable to meet the needs of nickel-cobalt-manganese ternary production, etc.

Pending Publication Date: 2021-08-31
HUNAN JINYUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production capacity of traditional nickel sulfate production enterprises can no longer meet the needs of nickel-cobalt-manganese ternary production
Many enterprises have used metal nickel to dissolve in acid, and after treatment, nickel sulfate that meets the needs can be obtained. However, when metal nickel is dissolved in acid, a large amount of hydrogen gas will be generated, which has extremely high requirements for equipment, environment, and operation, and there are certain security risk
At the same time, in the reaction process, in order to improve the production efficiency, a large amount of oxidant needs to be added, which increases the production cost on the one hand, and easily introduces new impurities on the other hand

Method used

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  • Method for preparing electronic-grade nickel sulfate from nickel powder, crystallization device and control method of crystallization device
  • Method for preparing electronic-grade nickel sulfate from nickel powder, crystallization device and control method of crystallization device
  • Method for preparing electronic-grade nickel sulfate from nickel powder, crystallization device and control method of crystallization device

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0044] Implementation mode 1: if figure 1 A method for preparing electronic-grade nickel sulfate from nickel powder, comprising the following steps: oxidation, cooling, acid leaching, copper removal, acid adjustment, concentration, cooling crystallization, drying and sieving, and secondary immersion. The special features are:

[0045] Said oxidation: the temperature of nickel powder is controlled in the calcination furnace at 400-700°C, and 1-5m of compressed air is injected per kilogram of nickel powder 3 , react for 1.0-2.5 hours.

[0046]Further, the oxidation: the nickel powder is controlled in the calciner at a temperature of 450-600°C, preferably 500°C, and 3-4m of compressed air is injected per kilogram of nickel powder. 3 , react for 1.0-1.5 hours.

[0047] In some embodiments, the nickel powder is controlled at a temperature of 400°C, 450°C, 500°C, or 550°C in the calciner.

[0048] In some embodiments, the compressed air injected per kilogram of nickel powder is 1...

Embodiment approach 2

[0081] Implementation mode 2: if Figure 2-5 , a crystallization device for preparing electronic-grade nickel sulfate from nickel powder. The crystallization device is composed of three sets of crystallizers with the same structure connected in series, that is, the first-stage crystallizer 1, the second-stage crystallizer 2, and the third-stage crystallizer 3 are connected in series. The crystallizer is composed of a crystallization frame 4, an oscillator 6 arranged under the crystallization frame 4, and a liquid outlet 5 with a control valve at the liquid outlet of the crystallization frame 4. The crystallization frame 4 is made of a cuboid, and its special The advantage is that: the bottom of the crystallization frame 4 is evenly distributed with protruding strips 7 whose cross section is arc-shaped, and the distance S between two adjacent protruding strips 7 is 1 / 25-1 / 15 of the width of the crystallization frame 4 , the width b and height h of the raised strip 7 are both 1 / ...

Embodiment approach 3

[0090] Embodiment 3: the control method of the crystallization device of nickel powder preparation electronic grade nickel sulfate, take the following steps:

[0091] a. Start the first-stage crystallizer 1: the concentrated nickel sulfate solution flows into the first-stage crystallizer 1, open the oscillator 6, the frequency of the oscillator is based on the fact that the cobalt sulfate solution does not overflow the crystallization frame, and the temperature of the nickel sulfate solution After reaching 45°C, it flows into the second-stage crystallizer 2 from the liquid discharge port 5, and the crystallized matter in the crystallization frame 4 is collected and sieved to enter the next process.

[0092] b. Start the second-stage crystallizer 2: After the nickel sulfate liquid in the second-stage crystallizer 2 is put in, add the fine particle nickel sulfate crystallization of the sieved material of the screening process, and other operations are the same as the first-stage ...

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Abstract

The invention discloses a method for preparing electronic-grade nickel sulfate from nickel powder, a crystallization device and a control method of the crystallization device, and relates to the technical field of non-ferrous metal hydrometallurgy. The method comprises the steps of oxidation, cooling, acid leaching, copper removal, acid adjustment, concentration, cooling crystallization, drying and screening, and secondary leaching, and is characterized in that in the oxidation step, the temperature of nickel powder in a calcining furnace is controlled to be 400-700 DEG C, the use amount of compressed air for each kilogram of nickel powder is 1-5 m3, and the reaction is carried out for 1.0-2.5 hours; the acid leaching comprises the following steps: putting the cooled nickel oxide in a reactor, controlling the temperature to be 45-70 DEG C, adding dilute sulfuric acid to control the pH value to be 0.5-1.5, and reacting for 1-3 hours. The invention also provides a crystallization device and a control method of the crystallization device. According to the method, metal nickel can be oxidized into divalent nickel oxide, hydrogen cannot be released when acid is added for dissolution, a large number of oxidizing agents do not need to be additionally added, new impurity ions are not added in the process, the nickel ion concentration is relatively improved, and nickel sulfate crystal particles are uniform.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal hydrometallurgy, in particular to a technology, equipment and control method for preparing electronic-grade nickel sulfate from nickel powder. Background technique [0002] With the development of new energy electric vehicles, power batteries, as an important part of them, have also developed rapidly. As the market changes, the battery consumption continues to increase. As one of the most important components of the battery, the positive electrode currently mainly includes two series of lithium iron phosphate and nickel-cobalt-manganese ternary. Among them, nickel-cobalt-manganese ternary components are developing in the direction of high nickel ratio with the continuous improvement of the cruising range of electric vehicles. When synthesizing nickel-cobalt-manganese ternary, nickel sulfate is the only raw material for its nickel element. At present, the production capacity of tradition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/10B01D9/02B01D9/00
CPCC01G53/10B01D9/0063B01D9/00C01P2006/80Y02P10/20
Inventor 刘训兵彭灿刘振张超文周群成王子董雄武赵湘平吴山木
Owner HUNAN JINYUAN NEW MATERIALS CO LTD
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