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A continuous crystallization process of ferrous sulfate in the production of sulfuric acid titanium dioxide

A technology of ferrous sulfate and sulfuric acid method, which is applied in the direction of ferric sulfate, solution crystallization, heat exchange cooling crystallization, etc. It can solve the problems of large-scale freezing and crystallization equipment, high energy consumption, and uncontinuous entry and exit of titanium liquid, so as to reduce investment Equipment, reduced energy consumption, and improved quality

Active Publication Date: 2020-10-13
安徽帝瑟化工科技工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among them, the production process of the above two processes is intermittent, the inflow and outflow of titanium liquid cannot be continuous, and the energy consumption is very high. Small-scale manufacturers use

Method used

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  • A continuous crystallization process of ferrous sulfate in the production of sulfuric acid titanium dioxide
  • A continuous crystallization process of ferrous sulfate in the production of sulfuric acid titanium dioxide
  • A continuous crystallization process of ferrous sulfate in the production of sulfuric acid titanium dioxide

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Embodiment 1

[0026] A continuous crystallization process of ferrous sulfate in the production of sulfuric acid titanium dioxide: comprising the following steps:

[0027] (1) Open the feed valve of the tube-and-tube heat exchanger, start the feed pump, and send the titanium liquid with a temperature of 55-68°C into the tube-type heat exchanger;

[0028] (2) The titanium liquid is pre-cooled to 37-45°C in the shell and tube heat exchanger;

[0029] (3) When the temperature of the titanium liquid in the tube-and-tube heat exchanger reaches 38-40°C, the titanium liquid enters the high-level tank through the conveying pipeline for continuous metering and enters the scraping-wall hollow plate cooling continuous crystallizer;

[0030] (4) Turn on the cooling water refrigerator, open the cooling water regulating valve, and pump circulating cooling water into the wall-scraping hollow plate cooling continuous crystallizer, and control the temperature at minus 10-20°C.

[0031] (5) The titanium liqu...

Embodiment 2

[0037] A continuous crystallization process of ferrous sulfate in the production of sulfuric acid titanium dioxide: comprising the following steps:

[0038] (1) Open the feed valve of the tube-and-tube heat exchanger, start the feed pump, and send the titanium liquid with a temperature of 53-65°C into the tube-type heat exchanger;

[0039] (2) The titanium liquid is pre-cooled to 38-45°C in the shell and tube heat exchanger;

[0040] (3) When the temperature of the titanium liquid in the tube-and-tube heat exchanger reaches 38-45°C, the titanium liquid enters the high-level tank through the conveying pipeline and is continuously metered into the scraping-wall hollow plate cooling continuous crystallizer;

[0041](4) Turn on the cooling water refrigerator, open the cooling water regulating valve, and pump circulating cooling water into the wall-scraping hollow plate cooling continuous crystallizer, and control the temperature at minus 10-15°C.

[0042] (5) The titanium liquid ...

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Abstract

The invention discloses a technology for continuously crystallizing ferrous sulfate in sulfuric acid-process titanium dioxide production, and relates to the related technical field of sulfuric acid-process titanium dioxide production and impurity removal. In the technology for continuously crystallizing the ferrous sulfate in the sulfuric acid-process titanium dioxide production, a material titanium solution passes by a tubular heat exchanger and an elevated tank, and then enters a wall-scraping-type hollow plate cooling and continuous crystallizing machine so as to achieve continuous crystallization through continuous feeding and discharging; by the technology, the crystallization process is simplified, input equipment is reduced, and the energy consumption is lowered; the wall-scraping-type hollow plate cooling and continuous crystallizing machine achieves the continuous crystallization and large-scale use of the ferrous sulfate in the sulfuric acid-process titanium dioxide production, and through regulation of the spiral rotation speed of the crystallizing machine, the particle size of byproduct ferrous sulfate particles is controlled, so that operation of a next separating process is facilitated; meanwhile, the quality of the byproduct ferrous sulfate is improved and the yield of the titanium dioxide is increased.

Description

Technical field: [0001] The invention relates to the related technical field of impurity removal in sulfuric acid titanium dioxide production, in particular to a ferrous sulfate continuous crystallization process in sulfuric acid titanium dioxide production. Background technique: [0002] At present, the separation of ferrous sulfate in the sulfuric acid titanium dioxide industry basically adopts vacuum evaporation crystallization, and a steam ejector is used to form a negative pressure in the crystallizer. At this time, the water in the titanium liquid evaporates due to the lowering of the boiling point, and the heat is taken away. , so that the temperature of the titanium solution is lowered. By controlling the temperature of the titanium liquid system, the solubility of ferrous sulfate is reduced, so that the crystallization of ferrous sulfate is precipitated, and then filtered. The method is easy to operate and has wide applicability, but there are shortcomings such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/14B01D9/02
CPCB01D9/0013B01D9/0059C01G49/14
Inventor 朱双春
Owner 安徽帝瑟化工科技工程有限公司