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Method for producing titanium dioxide by using titanium-containing blast furnace slag

A technology of titanium dioxide and blast furnace slag is applied in the field of comprehensive utilization of blast furnace slag, which can solve the problems such as failure to realize the resource utilization, ecological utilization, small processing capacity and secondary pollution of titanium-containing blast furnace slag, and achieves technical difficulty and equipment investment. The effect of cost reduction, slag discharge reduction and production energy consumption reduction

Inactive Publication Date: 2011-03-30
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above scheme is technically feasible, due to the problems of secondary pollution, high energy consumption, and small processing capacity, the resourceful and ecological utilization of titanium-containing blast furnace slag has not been realized in the end.

Method used

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  • Method for producing titanium dioxide by using titanium-containing blast furnace slag
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  • Method for producing titanium dioxide by using titanium-containing blast furnace slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) The titanium-containing blast furnace slag was crushed, ball-milled for 24 hours and sieved to 200 mesh, and placed in a 3 In the molten salt system, the mass ratio of NaOH to titanium-containing blast furnace slag is 4:1, and NaOH and NaNO 3 The molar ratio is 4:1, and reacted for 3 hours at a temperature of 500°C to obtain an intermediate product composed of sodium titanate, sodium silicate and sodium metaaluminate, and the leaching rate of titanium reaches more than 72.5%;

[0032] (2) Then wash the above-mentioned intermediate product in water at 60°C and filter it for 3 times, the mass ratio of solid to liquid for each washing is 1:20, and the soluble sodium silicate and sodium metaaluminate enter into the solution containing NaOH and NaNO 3 Alkaline solution, solid phase sodium titanate to form washing material;

[0033] (3) NaOH and NaNO containing sodium silicate and sodium metaaluminate 3 After removing impurities and concentrating the lye, return to NaOH...

Embodiment 2

[0038] (1) The titanium-containing blast furnace slag was crushed, ball-milled for 36 hours and sieved to 200 mesh, and placed in a 3 In the molten salt system, the mass ratio of NaOH to titanium-containing blast furnace slag is 3:1, and NaOH and NaNO 3 The molar ratio is 3:1, and reacted for 3 hours at a temperature of 450°C to obtain an intermediate product composed of sodium titanate, sodium silicate and sodium metaaluminate, and the leaching rate of titanium reaches more than 70.5%;

[0039] (2) Then wash the above intermediate product in water at 60°C and filter it for 3 times, the mass ratio of solid to liquid for each washing is 1:40, the soluble sodium silicate and sodium metaaluminate enter into the solution containing NaOH and NaNO 3 Alkaline solution, solid phase sodium titanate to form washing material;

[0040] (3) NaOH and NaNO containing sodium silicate and sodium metaaluminate 3 After removing impurities and concentrating the lye, return to NaOH and NaNO in s...

Embodiment 3

[0045] (1) The titanium-containing blast furnace slag was crushed, ball-milled for 72 hours and sieved to 200 mesh, and placed in a 3 In the molten salt system, the mass ratio of NaOH to titanium-containing blast furnace slag is 5:1, and NaOH and NaNO 3 The molar ratio is 5:1, and reacted for 3 hours at a temperature of 550°C to obtain an intermediate product composed of sodium titanate, sodium silicate and sodium metaaluminate, and the leaching rate of titanium reaches more than 73.8%;

[0046](2) Then wash the above-mentioned intermediate product in water at 70°C and filter it 3 times, the mass ratio of solid to liquid for each washing is 1:30, and the soluble sodium silicate and sodium metaaluminate enter into the solution containing NaOH and NaNO 3 Alkaline solution, solid phase sodium titanate to form washing material;

[0047] (3) NaOH and NaNO containing sodium silicate and sodium metaaluminate 3 After removing impurities and concentrating the lye, return to NaOH and ...

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Abstract

The invention relates to a comprehensive utilization technology of blast furnace slag, in particular to a method for producing titanium dioxide by using titanium-containing blast furnace slag. The technical scheme comprises the following steps of: crushing, ball milling and screening titanium-bearing blast furnace slag, and placing in a molten salt system containing NaOH and NaNO3; washing the intermediate product in water at 60-75 DEG C, and filtering; removing impurities of a NaOH and NaNO3 alkaline solution containing sodium silicate and sodium metaaluminate, concentrating, and returning to the NaOH and NaNO3 molten salt system; dissolving the washing material containing solid phase sodium titanate by using an inorganic acid, adding a reducing agent for a reduction reaction, and then filtering; filtering the titanium-containing solution to obtain an inorganic acid filtrate and a metatitanic acid product; and calcining the metatitanic acid product at 600-1300 DEG C to obtain the final product of titanium dioxide powder. The invention realizes high conversion rate of titanium, and furthest reduces environmental pollution at the same time.

Description

technical field [0001] The invention relates to a comprehensive utilization technology of blast furnace slag, in particular to a method for producing titanium dioxide by utilizing titanium-containing blast furnace slag. Background technique [0002] my country has relatively large reserves of vanadium-titanium magnetite, which has been proven to be 6.19 billion tons. At present, my country has first solved the technical problem of producing pig iron by smelting high-titanium iron (vanadium) concentrates in blast furnaces, but most of the titanium-containing phases are stored in the slag phase in a very fine and dispersed state, becoming 15~ 25% titanium-containing blast furnace slag, the perovskite in titanium-containing blast furnace slag is relatively stable, has low activity, and is difficult to handle. A large amount of titanium-containing blast furnace slag has caused the loss of titanium resources and caused huge pollution to the environment . At present, in order to s...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/12
CPCY02P10/20
Inventor 薛向欣于洪浩段培宁姜涛杨合
Owner NORTHEASTERN UNIV
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