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Nickel sulfate evaporative crystallization process

A technology of evaporative crystallization and nickel sulfate, applied in the direction of nickel sulfate, crystallization separation, multi-effect evaporation, etc., which can solve the problems of environmental pollution and non-environmental protection

Active Publication Date: 2017-08-04
JIANGSU RUISHENGHUA ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of waste liquid will be produced in the production process of nickel sulfate and its related products. If it is discharged directly, it will cause environmental pollution and is very unfriendly to the environment.

Method used

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  • Nickel sulfate evaporative crystallization process

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Embodiment Construction

[0024] Depend on figure 1 It can be seen that nickel sulfate evaporation crystallization process of the present invention comprises the following steps:

[0025] Step 1. When the system is started, the fresh steam directly preheats the third plate heat exchanger, the first evaporative concentration device, and the second evaporative concentration device in the heat exchanger group, and generates secondary steam. When the system is in normal operation, the second The temperature of the secondary steam is raised by 12°C, and then part of the heated secondary steam supplies heat to the first evaporation and concentration device, and the temperature of the remaining heated secondary steam is raised by 6°C again to supply heat to the second evaporation and concentration device.

[0026] The first evaporative concentration device comprises a gas-liquid separator 9 and a falling film heat exchanger 10 arranged in the housing of the gas-liquid separator 9, and the falling film heat ex...

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Abstract

The invention relates to a nickel sulfate evaporative crystallization process which comprises the following steps: S1, fresh steam supplies heat to a heat exchanger group, a first evaporation and concentration device and a second evaporation and concentration device; S2, a material enters the heat exchanger group to be pre-heated, then enters the first evaporation and concentration deice after being preheated, and when the material reaches an expected concentration in a gas-liquid separator, the material enters the second evaporation and concentration device to be further evaporated and concentrated; and S3, the material meeting the expected concentration value in the second evaporation and concentration device is discharged from a discharge port and enters a cooling kettle to be cooled, then enters a centrifugal machine to be separated and crystallized, and finally, a product is discharged from the centrifugal machine, and the separated mother liquor is stored in a mother liquor tank. The nickel sulfate evaporative crystallization process provided by the invention is stable and reliable, energy-saving and emission-reducing, small in occupied area and low in cost.

Description

technical field [0001] The invention relates to an evaporation crystallization process, in particular to a nickel sulfate evaporation concentration crystallization process. Background technique [0002] Nickel sulfate is mainly used in the electroplating industry. It is the main nickel salt of electroplating nickel and chemical nickel, and is also the source of metal nickel ions. It can dissociate nickel ions and sulfate ions during the electroplating process. In the production process of nickel sulfate and its related products, a large amount of waste liquid will be generated. If it is discharged directly, it will cause environmental pollution and is very environmentally friendly. Contents of the invention [0003] The object of the present invention is to provide a nickel sulfate evaporation concentration crystallization process that is stable, reliable, energy-saving and emission-reducing, occupies a small area, and is low in cost. [0004] The technical scheme that re...

Claims

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Application Information

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IPC IPC(8): B01D1/26B01D9/02C01G53/10
CPCB01D1/26B01D9/0004B01D2009/0086C01G53/10Y02P20/10
Inventor 张小江马恩禄吴再娟
Owner JIANGSU RUISHENGHUA ENERGY TECH CO LTD
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