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Method and equipment for production of titanium dioxide by sulphate process

A sulfuric acid method and titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of increasing the concentration cost and increasing the burden of titanium liquid concentration, so as to avoid the increase of concentration cost, improve the blockage of pipeline valves and Delivery pump, avoiding the effect of burden

Active Publication Date: 2015-12-02
SICHUAN PAN YAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the titanium in the centrifuged mother liquor can also be recovered in this way, the centrifuged mother liquor will dilute the titanium solution to make TiO in the titanium solution 2 The concentration is reduced by about 3-6g / l, which increases the burden of subsequent concentration of titanium liquid and increases the cost of concentration

Method used

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  • Method and equipment for production of titanium dioxide by sulphate process
  • Method and equipment for production of titanium dioxide by sulphate process

Examples

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Embodiment 1-4

[0059] It is used to illustrate the device and method for producing titanium dioxide by sulfuric acid method provided by the present invention.

[0060] The equipment adopted in embodiment 1-4 is specified as follows:

[0061] Such as figure 1 As shown, the equipment for sulfuric acid production of titanium dioxide provided by the present invention includes acidolysis / leaching device 10, crystallization device (not shown in the figure), crystal separation device (not shown in the figure), dilution tank 30, process Circulating water pipeline 40, crystallized titanium liquid tank 50, small degree water tank 60, and calcining device (not shown in the figure). in,

[0062]The crystal separation device is arranged downstream of the acidolysis / leaching device 10 and the crystallization device, and includes multiple groups of centrifuges 20, and the centrifugal liquid outlet ends of the multiple groups of centrifuges 20 pass through the centrifugal mother liquor delivery pipeline 2...

Embodiment 1

[0069] Referring to the method for producing titanium dioxide by the sulfuric acid method in Comparative Example 2, the difference is that: the centrifuged mother liquor and the sewage circulating water (the filtered calcination tail gas is sprayed with waste water, the temperature is 40° C.) in the dilution tank 30 in a weight ratio of 1:2.5 Mix to form a centrifugal mother liquor dilution, and use the centrifugal mother liquor dilution as a part of the leaching water, and add it to the acidolysis maturation system in the acidolysis / leaching device 10 through the small water tank 60 (that is, add it to the leaching step), and The consumption of described centrifugal mother liquor diluent is 15wt%-20wt% of described leaching water consumption, and the consumption of centrifugal mother liquor diluent is controlled so that TiO in titanium sulfate solution after leaching step 2 The concentration is 120-125g / L.

Embodiment 2

[0071] Referring to the method for producing titanium dioxide by the sulfuric acid method in Comparative Example 2, the difference is that: the centrifuged mother liquor and the net circulating water (circulating water from the cooling equipment) are mixed in a weight ratio of 1:2 to form a centrifugal mother liquor dilution, and the centrifugal mother liquor dilution is As part of the leaching water, it is added to the acidolysis maturation system in the acidolysis / leaching device 10 through the small water tank 60 (that is, added to the leaching step), and the amount of the centrifuged mother liquor dilution is the leaching The 25wt%-30wt% of water consumption, the consumption of centrifugal mother liquor diluent is controlled to make TiO in titanium sulfate solution after leaching step 2 The concentration is 130-140g / L.

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Abstract

Relating to the field of titanium dioxide production, the invention discloses a method and equipment for production of titanium dioxide by a sulphate process. Specifically, the method includes the steps of acidolysis, leaching, crystallization and crystal separation on ilmenite concentrate powder, and the method also includes the steps of mixing the centrifugal mother liquid generated in a crystal separation process with process water in a weight ratio of 1:(1-2.5) to form a centrifugal mother liquid diluent, and using the centrifugal mother liquid diluent as at least part of leaching water to be reused in the leaching step. The process water is one or more of desalted water, clean circulating water and dirty circulating water. According to the method, the centrifugal mother liquid and the process water are mixed in proportion, at the same time of avoiding hydrolysis of titanium in the centrifugal mother liquid, the centrifugal mother liquid is diluted, so that the problem of blocking a pipeline valve and transfer pump can be effectively improved. Also, by reusing the centrifugal mother liquid diluents in the leaching step, the titanium in the centrifugal mother liquid can be recovered, and also increase of the concentration cost is avoided.

Description

technical field [0001] The invention relates to the field of titanium dioxide production, in particular to a method and equipment for producing titanium dioxide by a sulfuric acid method. Background technique [0002] Titanium dioxide (English name: titaniumdioxide), the main component is titanium dioxide (TiO 2 ) of white pigment. The scientific name is titanium dioxide (titaniumdioxide), which is a polycrystalline compound whose particles are arranged regularly and have a lattice structure. There are two manufacturing methods of titanium dioxide: Sulphate Process and Chloride Process. At present, China's titanium dioxide factories are mainly produced by the sulfuric acid method. [0003] The technological process of producing titanium dioxide by sulfuric acid method includes: (1) acid hydrolysis, fully mix titanium concentrate powder and sulfuric acid (concentration is 86wt%-89wt%) in proportion (acid-mineral ratio 1.54-1.65), add dilution water (or waste acid), and di...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 吴健春杜剑桥
Owner SICHUAN PAN YAN TECH
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