Process for clean producing titanium dioxide and potassium hexatitanate wiskers by titanium iron ore or high-titanium dreg sub-molten salt

A technology of potassium hexatitanate whisker, titanium dioxide, applied in titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of low utilization rate of titanate resources, serious environmental pollution, high energy consumption, etc., Achieve the effect of easy comprehensive utilization, reduce environmental pollution, and reduce production energy consumption

Inactive Publication Date: 2007-08-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of high energy consumption, serious environmental pollution and low resource utilization rate of titanate in the existing titanate production method, and to provide a clean titanium dioxide with industrial operability and environmental friendliness. New production technology to replace the existing sulfuric acid method and chlorination method; and provide a feasible process for directly preparing potassium titanate whiskers from ilmenite or high-titanium slag

Method used

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  • Process for clean producing titanium dioxide and potassium hexatitanate wiskers by titanium iron ore or high-titanium dreg sub-molten salt
  • Process for clean producing titanium dioxide and potassium hexatitanate wiskers by titanium iron ore or high-titanium dreg sub-molten salt

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Experimental program
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Effect test

Embodiment 1

[0027] Please refer to Figures 1 and 2. The KOH solution that is circulated back to the reactor is heated to 240°C after part of the water is removed, and 95% of the ilmenite or high-titanium slag with a particle size of less than 200 mesh is added, and the reaction is carried out for 6 hours under complete mixing conditions, wherein KOH and ilmenite or The weight ratio of the high-titanium slag is 4:1; a mixed reaction product containing lye, titanate and iron-rich slag is obtained; the titanium conversion rate is over 99%. Wash and filter the mixed product. After washing, the temperature is 80°C; the mixed product of titanate and iron-rich slag is subjected to high-gradient magnetic separation, and the obtained titanate is added with water and filled with carbon dioxide gas to adjust the pH of the solution to 6, and keep it warm at 20°C 48 hours, separated, washed the solid with water, dried, and calcined at 500° C. for 10 hours to obtain a titanium dioxide product. The XRD ...

Embodiment 2

[0029] Please refer to attached picture 1. The KOH solution that is circulated back to the reactor is heated to 280°C after part of the water is removed, and 95% of the ilmenite or high-titanium slag with a particle size of less than 200 mesh is added, and the reaction is carried out for 4 hours under complete mixing conditions, wherein KOH and ilmenite or The weight ratio of the high-titanium slag is 6:1; a mixed reaction product containing lye, titanate and iron-rich slag is obtained; the titanium conversion rate is above 99%. Wash and filter the mixed product. After washing, the temperature is 140°C; perform high-gradient magnetic separation on the mixed product of titanate and iron-rich slag, add water to the obtained titanate, adjust the pH of the solution to 4 with HCl, and keep it at 60°C for 30 hours , separated, washed with water, dried, and calcined at 500-1000° C. for 0.5-10 hours to obtain a titanium dioxide product.

Embodiment 3

[0031] Please refer to attached picture 1. The KOH solution that is circulated back to the reactor is heated to 350°C after part of the water is removed, and 95% of the ilmenite or high-titanium slag with a particle size of less than 200 mesh is added, and the reaction is carried out for 2 hours under complete mixing conditions, wherein KOH and ilmenite or The weight ratio of the high-titanium slag is 8:1; a mixed reaction product containing lye, titanate and iron-rich slag is obtained; the titanium conversion rate is above 99%. The mixed product was washed and filtered, and the temperature after washing was 180°C; the mixed product of titanate and iron-rich slag was subjected to high-gradient magnetic separation, and the obtained titanate was added to water, and the pH of the solution was adjusted to 3 with HCl, and kept at 100°C for 2 hours, separated, washed the solid with water, dried, and calcined at 500-1000° C. for 0.5-10 hours to obtain a titanium dioxide product.

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Abstract

The invention relates to a method to produce titanium dioxide and K2Ti6O13 whisker from using ilmenite or high titanium slag as raw material. It includes the following steps: ilmenite or high titanium slag reacting in KOH liquid phase medium, and the weight ratio is 4:1-8:1; gaining the mixture reaction product of alkali liquid, barium titanate and iron enriched slag; taking hydrolysis or acidolysis, burning and purifying to the product to gain purified titanium dioxide and K2Ti6O13 whisker. The reacting temperature is 240-350 degree centigrade and the yield is over 99%. The recycled titanium dioxide could be used as dye, coating, etc; and the K2Ti6O13 whisker could be used as insulating material, refractory material, and friction material.

Description

technical field [0001] The invention belongs to the field of titanate production methods, in particular to a method for cleanly producing titanium dioxide (titanium dioxide) and potassium hexatitanate whiskers by using ilmenite or high-titanium slag as raw materials. Background technique [0002] The titanium dioxide industry is an important basic raw material industry intersecting chemical industry and metallurgy. At present, the sales volume of titanium dioxide in the world market has reached nearly 5 million tons. As a white pigment and filler, titanium dioxide has become one of the three largest commodities in the world's inorganic chemical products, second only to synthetic ammonia and phosphoric acid, ranking third. Titanium dioxide is a white pigment, scientific name titanium dioxide, as an important inorganic chemical product, due to its stable chemical properties, high refractive index and ideal particle size distribution, it is widely used in recent years for its g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01G23/08
Inventor 仝启杰刘玉民齐涛张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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