Nickel-cobalt sulfate continuous-crystallizing process

A sulfate and process technology, applied in the direction of nickel sulfate, etc., can solve the problems of high energy consumption, low production efficiency, and high quality requirements of personnel in the evaporation process, and achieve significant energy saving effects, continuous production, and simple and convenient operation.

Active Publication Date: 2014-12-10
ZHEJIANG HUAYOU COBALT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: 1. The evaporation process consumes a lot of energy; 2. The crystallization process ha

Method used

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  • Nickel-cobalt sulfate continuous-crystallizing process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Control the opening of the valve 7, and the concentration of nickel sulfate at 80-90°C with a solute mass ratio of 37%-39% is 1-4m 3 / h of the flow into the cooling circuit. Control the P01 frequency conversion governor of the cooling circulation pump, and adjust the flow rate of the circulation pump to 900-1100m 3 / h. Control the opening of the valve 6, the flow rate of circulating cooling water is 40~85m 3 / h, so that the cooler discharge temperature is 33 ~ 38 ℃. Control the JB01 frequency conversion governor of the crystallization agitator, and adjust the agitation and discharge volume to 1000-1200m 3 / h, the crystal is in a suspended state, which is conducive to the graded growth of the crystal, and the temperature of the crystal slurry in the crystallizer is 32-35 °C. Valve 9 is closed. Control the opening of the valve 5, and the output of the crystallizer slurry is 1-4m 3 / h, and after centrifugation and drying, 75-80% of nickel sulfate hexahydrate crystal ...

Embodiment 2

[0017] Control the opening of the valve 7, and the concentration of cobalt sulfate at 80-90°C with a solute mass ratio of 30%-33% is 4-8m 3 / h of the flow into the cooling circuit. Control the cooling circulation pump P01 frequency conversion governor, adjust the flow rate of the circulation pump to 1100 ~ 1250m 3 / h. Control the opening of the valve 6, and the circulating cooling water flow rate is 80-97m 3 / h, so that the cooler discharge temperature is 35 ~ 40 ℃. Control the JB01 frequency conversion governor of the crystallization agitator, and adjust the agitation and discharge volume to 1200-1500m 3 / h, the crystal is in a suspended state, which is conducive to the graded growth of the crystal, and the temperature of the crystal slurry in the crystallizer is 32-38 °C. Control the opening of the valve 9, and the return volume of the fine crystal eliminating liquid is 1~2m 3 / h. Control the opening of the valve 5, and the output of the crystallizer slurry is 4-8m 3 ...

Embodiment 3

[0019] Control the opening of the valve 7, and the 80-90°C nickel sulfate concentrate with a solute mass ratio of 38%-39% is 8-10m 3 / h of the flow into the cooling circuit. Control the cooling circulation pump P01 frequency conversion governor, adjust the flow rate of the circulation pump to 1250~1500m 3 / h. Control the opening of the valve 6, the flow rate of circulating cooling water is 85~106m 3 / h, so that the cooler discharge temperature is 39 ~ 45 ℃. Control the JB01 frequency conversion governor of the crystallization agitator, and adjust the agitation and discharge volume to 1500-1800m 3 / h to keep the crystal in a suspended state, and the temperature of the crystal slurry in the crystallizer is 35-43°C. Control the opening of the valve 9, and the return volume of the fine crystal eliminating liquid is 2~3m 3 / h. Control the opening of the valve 5, and the output of the crystallizer slurry is 8-10m 3 / h, and after centrifugation and drying, 85-90% of the nickel...

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Abstract

The invention discloses a nickel sulfate hexahydrate crystal and cobalt sulfate heptahydrate crystal continuous-crystallizing process which comprises the following steps: firstly carrying out MVR evaporation concentration on a high-purity solution produced through an extraction procedure to 30%-39%, and secondly continuously cooling and crystallizing through an improved cooling type internal-circulating continuous crystallizer; continuously discharging crystal slurry from the bottom of the crystallizer for centrifugal solid-liquid separation; and continuously drying a crystal product at low temperature to produce product crystals with large granularity and uniform size distribution, and recovering a mother solution to an evaporation process. Compared with the traditional periodic crystallization process, the nickel sulfate hexahydrate crystal and cobalt sulfate heptahydrate crystal continuous-crystallizing process disclosed by the invention has the advantages of low evaporation energy consumption, fewer crystallization control process parameters, stability in operation, high automation degree, high production efficiency and the like and is easy to control, and operators are reduced.

Description

technical field [0001] The invention belongs to the technical field of sulfate industrial production, in particular to a continuous sulfate crystallization process. Background technique [0002] The industrial production of nickel-cobalt sulfate is generally obtained by concentrating dilute solutions to saturation through single-effect, two-effect and three-effect evaporation processes, and then performing single-pot batch cooling and crystallization production. This process has the following disadvantages: 1. The evaporation process consumes a lot of energy; 2. The crystallization process has many control parameters, low degree of automation, low production efficiency, difficult control, and high quality requirements for personnel. Contents of the invention [0003] The object of the present invention is to overcome the defect that exists in the prior art, a kind of nickel sulfate hexahydrate and cobalt sulfate heptahydrate continuous crystallization process are provided....

Claims

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Application Information

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IPC IPC(8): C01G53/10
Inventor 向波刘永东刘秀庆包红伟
Owner ZHEJIANG HUAYOU COBALT
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