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Hydrochloric acid-extraction method for preparing rutile titanium white

A technology of rutile titanium dioxide and extraction method, which is applied in the field of production of rutile titanium dioxide, can solve the problems of unavailability, technical difficulty of chlorination method, high energy consumption, etc., and achieve the effect that is beneficial to production cost

Inactive Publication Date: 2006-05-03
陈泽安
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, a large amount of waste acid and by-product FeCl2 4H2O cannot be utilized, causing serious environmental pollution
The products produced cannot reach the pigment level (the whiteness and decolorization power are poor, and can only be used as titanium dioxide for welding electrodes)
Therefore, this method eventually disappeared in the market due to poor product quality, serious equipment corrosion, high cost, and large sewage discharge.
[0004] At present, the production method of domestic rutile titanium dioxide mainly adopts the chlorination method. The raw material requirement of this method is titanium-rich material (TiO2 60%) or artificial rutile or titanium slag, and only rutile TiO2 lattice can be produced. 900~1500℃, harsh reaction conditions, high production control requirements, need to use high temperature and corrosion resistant material equipment, high energy consumption
Therefore, the technical difficulty of the chlorination method is large, the investment is huge, the energy consumption is large, and the environmental protection is poor, which makes investors daunted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Example 1 Get ilmenite powder (Teng County, Guangxi, containing TiO 2 45.5%, 325 mesh) 100 grams, the total chlorine concentration is 392g / L regenerated hydrochloric acid 500ml, seal and stir, heat up to 80 ℃, constant temperature 4-5 hour. Press filter while hot to obtain 500ml of acid hydrolyzate. Ti 4+ The content is 53.7g / L, and the acid hydrolysis rate of titanium is 98.4%. Add 7 grams of iron powder to 500ml of acid solution, stir and react below 60°C for about 30 minutes, cool to 15°C, press filter to obtain 410ml of reducing solution, Ti 4+ Content 64.4g / L; and FeCl 2 4H 2 O 158 grams (wet weight). The overall yield of titanium was 96.7%.

example 2

[0031] Example 2 Take 410ml of the reducing solution obtained in Example 1 and 1230ml of 10% TRPO kerosene for three-stage cross-flow extraction at a temperature of 45-50°C to obtain 1280ml of the loaded organic phase. Then use 0.5N HCl and the loaded organic phase to carry out five-stage countercurrent back extraction at a temperature of 45-50 ° C to obtain 377 ml of back extraction solution, Ti 4+ The content is 68.6g / L. The recovery rate of titanium is 97.9%.

example 3

[0032] Example 3 Get the TiCl prepared by the above method 4 Solution 600ml, Ti 4+ Content 61.8g / L, add appropriate amount of TiCl 3 until the solution is free of Fe 3+ exists (with NH 4 CNS detection), and adding 1.6% polyacrylamide (or acrylic resin), heating, stirring, distillation, the solution is from turbid → purple white → milky white. When the temperature rises to 106°C, a slight boil is maintained for about 80 minutes. At this time, a large number of uniform and fine spherical metatitanic acid particles appear in the solution, with a diameter of 4-6μ. Centrifuge and wash with 0.5N HCl until free of Fe. 73 ml of metatitanic acid slurry was obtained, containing 98.2% (W / V) of dry metatitanic acid, and the hydrolysis rate of titanium was 96.7%. Collect the distillate to obtain 18% pure hydrochloric acid solution for future use.

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Abstract

The invention discloses a hydrochloric extraction method to prepare rutile-type titan white, which comprises: decomposing the ilmenite with hydrochloric acid and iron powder to reduce high-valence ferrum; separating titanium tetrachloride with solvent extraction to form water liquid with given concentration; adding macromolecular organics for thermal hydrolyzation; filtering, bleaching, and obtaining high-pure fine grain of metatitanic acid; treating with salt, microwave drying, calcining at 900Deg, screening, and obtaining the product. This method needs low energy consumption, and fits to low or rich grade material.

Description

1. Technical field [0001] The invention relates to a method for producing rutile titanium dioxide, in particular to a method for preparing rutile titanium dioxide with a hydrochloric acid method. 2. Background technology [0002] Due to its high refractive index, stable chemical properties, good decolorization power and gloss, rutile titanium dioxide is currently the world's preferred high-quality white pigment and is widely used in coatings, papermaking, plastics, enamel, paints, inks, rubber, cosmetics, etc. industry. With the rapid development of my country's economy, the domestic titanium dioxide market has undergone tremendous changes. In 2003, my country's titanium dioxide consumption reached 600,000 tons, becoming the world's second largest consumer after the United States (1.14 million t / a). In recent years, the production and demand of titanium dioxide in my country have been growing rapidly, but compared with domestic products and imported products, the grade of ...

Claims

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Application Information

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IPC IPC(8): C22B3/00C22B1/16C22B3/20
Inventor 陈泽安
Owner 陈泽安
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