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Negative pressure evaporation and step-by-step feeding method of nickel sulfate solution

A negative pressure evaporation, step-by-step feeding technology, applied in nickel sulfate and other directions, to achieve the effect of stable heating temperature, simple operation and small footprint

Active Publication Date: 2014-07-02
广东芳源新材料集团股份有限公司
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At present, there is no relevant report on this technology in China.

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  • Negative pressure evaporation and step-by-step feeding method of nickel sulfate solution

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Embodiment Construction

[0015] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0016] As shown in accompanying drawing, a kind of nickel sulfate solution negative pressure evaporation step-by-step feeding method comprises the following steps:

[0017] 1. Prepare the solution: Prepare the nickel sulfate solution to be produced so that the concentration is 75-95g / L.

[0018] 2. Negative pressure evaporation: open the feed pipe valve switch, inject the nickel sulfate solution into the negative pressure evaporation device to the feed limit liquid level, close the feed pipe valve, turn on the heating device to heat the negative pressure evaporation device, and turn on the negative pressure Table, start the vacuum machine, evacuate to -0.01--0.01MPa, keep it for about 1h, raise the temperature of the liquid to about 100°C, and then decompress to keep the pressure in the negative pressure evaporation device at 0.4MPa, and then 100 ...

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Abstract

The invention discloses a negative pressure evaporation and step-by-step feeding method of a nickel sulfate solution. The method comprises the following steps: preparing the nickel sulfate solution to be produced; performing vacuum pumping on a negative pressure evaporator; performing continuous heating on the solution in the negative pressure evaporator; performing cooling and crystallization on the concentrated solution; and further performing step-by-step feeding. The method is characterized in that the step-by-step feeding and the vacuum pumping operation are simultaneously performed. Therefore, the volume of the evaporation device can be fully utilized, the number of times of operation can be reduced, and the purpose of improving working efficiency can be further achieved. The method disclosed by the invention has the characteristics of fast evaporation speed, high production efficiency and simple operation, the number of equipment used by the method is small, and the equipment occupies small area, and is environment-friendly and pollution-free.

Description

technical field [0001] The invention relates to a stepwise feeding method for negative pressure evaporation of nickel sulfate solution. Background technique [0002] Nickel sulfate is a very important chemical reagent, mainly used in electroplating, batteries, catalysts and other fields, and is generally sold in the form of nickel sulfate crystals. Obtaining nickel sulfate crystals needs to be purified. At present, the purification of nickel sulfate is mainly realized by steam indirect heating and concentration in China. The main process is to concentrate and purify the nickel sulfate solution, and then carry out cooling crystallization to obtain higher Pure nickel sulfate crystals. The principle of steam indirect heating concentration method is: when the acidity of the solution increases or the temperature decreases, the saturation concentration of nickel ions in the solution decreases accordingly, that is, nickel ions form nickel sulfate crystals and precipitate. When th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/10
Inventor 罗爱平吴芳
Owner 广东芳源新材料集团股份有限公司
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