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Technique for preparing titanium dioxide from titanium-containing mineral

A titanium mineral, titanium oxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of equipment corrosion, environmental pollution, complicated operation, etc., and achieve the effect of reducing energy consumption

Inactive Publication Date: 2010-09-22
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And he needs to remove iron in heated concentrated acid, the operation is more complicated
The above methods not only have serious environmental pollution, but also concentrated acid and concentrated alkali corrode the equipment seriously, and more importantly, most of the iron in the raw material will be removed by consuming a large amount of acid, which not only causes serious environmental pollution problems, Moreover, the cost of preparation has remained high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Raw material preparation: titanium concentrate, potassium carbonate; mix the two raw materials evenly, where K 2 O and TiO 2 The mass ratio is 1:2, the sintering temperature is 900°C, and the sintering time is 3 hours. After the upper layer is peeled off, the product of the lower layer is ground and soaked in dilute hydrochloric acid with a mass concentration of 0.01% for 30 minutes, wherein the mass ratio of the substance to be washed to the acid solution is 1:5, and the product is filtered and calcined at 500°C for 2 hours to obtain Anatase TiO with a purity of 95% 2 .

Embodiment 2

[0014] Raw material preparation: ilmenite, sodium carbonate; fully mix the two raw materials, of which Na 2 O and TiO 2 The mass ratio is 1:1.5, the sintering temperature is 800°C, and the sintering time is 8 hours. After the upper layer is peeled off, the lower layer is ground and soaked in a dilute sulfuric acid solution with a mass concentration of 1% for 1 hour, wherein the mass ratio of the washed material to the acid solution is 1:1, and the filtered product is sintered at 600°C for 30 minute. Anatase TiO with a purity of 97% 2 .

Embodiment 3

[0016] Raw material preparation: ilmenite, sodium nitrate; fully mix the two raw materials, of which Na 2 O and TiO 2 The mass ratio is 1:0.5, the sintering temperature is 1100°C, and the sintering time is 3 hours. After the upper layer is peeled off, the lower layer is ground and immersed in a dilute nitric acid solution with a mass concentration of 5% for 2 hours, wherein the mass ratio of the washed material to the acid solution is 1:10, and finally filtered and heated at 600° Sintering in medium for 1 hour, the product is anatase TiO with a purity of 96%. 2 .

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Abstract

The present invention provides a titania process by mineral containing titanium, baking 30 min-20 hour under the temperature 800-1100 Celsius after mixing mineral containing titanium and alkali metal salt, mass ratio of alkali metal oxides in alkali metal salt and titanium dioxide in mineral containing titanium is 1:0.2-2, having two-layer product; breaking the lower material and soaking in diluted acid solution, filtering, baking filter mass under the temperature 300-600 Celsius, obtaining anatase titanium dioxide which purity is above 95%. The acid concentration is 1 / 20-1 / 100 of sulfuric acid process contrast to the traditional method, the usage of acid is below 5% of the above method. The method contrast to chlorination route has large investment, lower operating cost, and need not addhigh intensity strong acid and alkali, and lower equipment requirement.

Description

technical field [0001] The invention belongs to the field of preparation of titanium oxide, and in particular relates to a green process for preparing titanium oxide by using titanium minerals as raw materials. Background technique [0002] Titanium oxide is an important inorganic material, which is widely used in various industries in the national economy. In the coating industry, titanium oxide is an important raw material. At the same time, in the papermaking field, it is a good filler and an indispensable ink. White pigments, in addition, have great applications in textiles, rubber, and cosmetics. In recent years, titanium oxide has attracted much attention as a photocatalytic reactant. Most photocatalysts are n-type semiconductors, such as: TiO 2 , ZnO, CdS, WO 3 , SnO 2 , Fe 2 o 3 etc., where the nanostructured TiO 2 Because of its unique semiconductor photocatalytic properties, high activity, good stability, and harmless to human body, it has become the most wid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/08
Inventor 陆小华刘畅程宝君周亚新冯新
Owner NANJING TECH UNIV
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