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A method and equipment for producing titanium dioxide by sulfuric acid method

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: 2016-08-17
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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  • A method and equipment for producing titanium dioxide by sulfuric acid method
  • A method and equipment for producing titanium dioxide by sulfuric acid method

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Embodiment 1-4

[0059] The device and method for producing titanium dioxide by the sulfuric acid method provided by the present invention are described.

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

[0061] like figure 1 As shown, the equipment for producing titanium dioxide by the sulfuric acid method provided by the present invention includes an acid hydrolysis / leaching device 10, a crystallization device (not shown in the figure), a crystal separation device (not shown in the figure), a dilution tank 30, a process The circulating water pipeline 40, the crystalline titanium liquid tank 50, the small water tank 60, and the calcining device (not shown in the figure). in,

[0062]The crystal separation device is arranged downstream of the acid hydrolysis / leaching device 10 and the crystallization device, and includes multiple sets of centrifuges 20. The centrifugal liquid outlet ends of the multiple sets of centrifuges 20 pass through the centrifugal mother liquo...

Embodiment 1

[0069] With reference to the method for producing titanium dioxide by the sulfuric acid method in Comparative Example 2, the difference is: the centrifugal mother liquor and the sewage circulating water (the filtered calcined tail gas spraying waste water, the temperature is 40 ° C) in the dilution tank 30 at a weight ratio of 1:2.5 Mixing to form a centrifugal mother liquor dilution, the centrifugal mother liquor dilution is used as a part of the leaching water, and is added to the acidolysis maturation system in the acidolysis / leaching device 10 through a small water tank 60 (i.e. is added to the leaching step), and The amount of the centrifugal mother liquor diluent is 15wt%-20wt% of the amount of the leaching water, and the amount of the centrifugal mother liquor diluent is controlled so that the TiO2 in the titanium sulfate solution after the leaching step 2 The concentration is 120~125g / L.

Embodiment 2

[0071] With reference to the method for producing titanium dioxide by the sulfuric acid method in Comparative Example 2, the difference is: the centrifugal mother liquor is mixed with net circulating water (circulating water from the cooling equipment) at a weight ratio of 1:2 to form a centrifugal mother liquor dilution, and the centrifugal mother liquor dilution As a part of the leaching water, it is added to the acidolysis maturation system in the acidolysis / leaching device 10 through a small water tank 60 (that is, added to the leaching step), and the amount of the centrifugal mother liquor diluent is the amount of the leaching solution. 25wt%-30wt% of the amount of water taken, and the amount of the centrifugation mother liquor diluent is controlled so that the TiO2 in the titanium sulfate solution after the 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: titanium dioxide), the main component is titanium dioxide (TiO 2 ) of white paint. The scientific name is titanium dioxide, which is a polycrystalline compound whose particles are regularly arranged and have a lattice structure. There are two manufacturing methods of titanium dioxide: sulfuric acid method (Sulphate Process) and chlorination method (Chloride Process). At present, titanium dioxide factories in China 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 mixing titanium concentrate powder with sulfuric acid (concentration is 86wt%-89wt%) in proportion (acid-to-ore ratio 1.54-1.65), adding diluti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
Inventor 吴健春杜剑桥
Owner SICHUAN PAN YAN TECH
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