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Method for preparing high-grade synthetic rutile

An artificial rutile, high-grade technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of low quality of titanium-rich material, increase investment cost, improve technical operation difficulty, etc., achieve low equipment investment, low cost, The effect of broad applicability

Inactive Publication Date: 2011-08-03
KUNMING METALLURGY INST
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Problems solved by technology

[0004] Chinese patent No. ZL200510048754.5 discloses a method of producing titanium-rich material from electric furnace titanium slag. This invention uses Yunnan titanium slag as raw material and proposes an acid-base combined leaching method to obtain TiO 2 >90% titanium-rich material, the process uses high-pressure equipment, which increases the investment cost and the difficulty of technical operation, and the quality of the obtained titanium-rich material is low

Method used

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Examples

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Effect test

Embodiment 1

[0023] 20% sodium hydroxide solution and 75% electric furnace titanium slag with a particle size of <0.1 mm were mixed according to the weight-liquid-solid ratio of 8:1, and reacted at a temperature of 80°C for 10 hours. At this time, the pressure of the system was the standard atmospheric pressure of 0.1MPa. After the reaction, after operations such as filtration and washing, the alkali leaching residue is obtained. The alkali leaching slag is pre-oxidized in the electric furnace, the pre-oxidation temperature is 700 ℃, the pre-oxidation time is 4h, and the air flow rate is 1000 L / h. The titanium slag after the pre-oxidation treatment was mixed with the modifying agent ammonium hydrogen phosphate in a weight ratio of 5:1, and modified at 800°C for 3 hours to obtain the modified slag. 20% sulfuric acid solution and modified slag were mixed according to the weight-liquid-solid ratio of 7:1, the reaction temperature was kept at 130°C, the reaction pressure was 0.5MPa, and the ac...

Embodiment 2

[0026] The mixture of 30% potassium hydroxide solution and 10% lithium hydroxide solution is mixed with 75% electric furnace titanium slag with a particle size of <0.1 mm according to the weight-liquid-solid ratio of 4:1, and reacted at a temperature of 130°C for 1 hour. The pressure is 1.0 MPa. After the reaction, after operations such as filtration and washing, the alkali leaching residue is obtained. The alkali leaching slag is pre-oxidized in the electric furnace, the pre-oxidation temperature is 1000 ℃, the pre-oxidation time is 1h, and the air flow rate is 950 L / h. The titanium slag after the pre-oxidation treatment was mixed with the modifying agent ammonium polyhydrogen phosphate according to the weight ratio of 3:1, and modified at 600°C for 7 hours to obtain the modified slag. The mixture of 15% hydrochloric acid solution and 30% nitric acid solution is mixed with the modified slag according to the weight liquid-solid ratio of 5: 1, the reaction temperature is kept ...

Embodiment 3

[0029] Ammonia water and 75% electric furnace titanium slag with a particle size <0.1 mm were mixed according to the weight-liquid-solid ratio of 7:1, and reacted at a temperature of 95°C for 6 hours. At this time, the pressure of the system was the standard atmospheric pressure of 0.1MPa. After the reaction, after operations such as filtration and washing, the alkali leaching residue is obtained. The alkali leaching slag is pre-oxidized in the electric furnace, the pre-oxidation temperature is 800 ℃, the pre-oxidation time is 3h, and the air flow rate is 840 L / h. The pre-oxidized titanium slag was mixed with the modifier phosphorus pentoxide in a weight ratio of 1:1, and modified at 700° C. for 6 hours to obtain the modified slag. 40% nitric acid solution and modified slag were mixed according to the weight-liquid-solid ratio of 15:1, the reaction temperature was kept at 100°C, the reaction pressure was 0.1MPa, and the acid leaching time was 10h. The reacted acid leaching re...

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Abstract

The invention relates to a method for preparing high-grade synthetic rutile; the method comprises the following steps: electro-titanium slag and an alkaline solution are mixed by weight mixture ratio of liquid to solid of 1:1 to 15 for alkali leaching impurity removal reaction; after being reacted for 0.5 to 24 hours, the mixture is filtered and scrubbed to obtain alkali leached slag; modified slag is obtained after pre-oxidation and activated modification are successively carried out on alkali leached slag; the modified slag and the acid solution are mixed by weight mixture ratio of liquid to solid of 1:1 to 15 for acid leaching impurity removal reaction; after the mixture is reacted for 1 to 24 hours, acid leached slag is obtained; the synthetic rutile with the purity of greater than 93% is obtained after the acid leached residue is dried; the method meets the requirement that a chlorination process is used for titanium dioxide production, and has wide applicability to raw materials; the manufactured rutile has excellent physical and chemical properties, high purities and uniform grain fineness distribution; the recovery rate of titanium in the whole process is higher; the needed device has few investment, low energy consumption and has little impact on environment and low cost; leaching solutions generated after each-section reaction is recovered and processed for cyclic utilization.

Description

technical field [0001] The invention relates to a method for preparing high-grade artificial rutile, in particular to a method for preparing artificial rutile with a purity exceeding 93% by using electric furnace titanium slag as a raw material. Background technique [0002] Titanium dioxide is an important chemical raw material, and it is a white pigment with superior performance, which is widely used in coatings, plastics, paper and other industries. The current titanium dioxide production technology is mainly divided into sulfuric acid method and chlorination method. The sulfuric acid method uses titanium concentrate or acid-soluble titanium slag as raw material to produce rutile and anatase titanium dioxide. The waste water, waste acid and waste residue produced by it are With by-products such as ferrous sulfate, the environmental pollution is more serious; the chlorination method uses TiO 2 High-titanium slag or artificial rutile with a content of more than 90% is used...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 谢刚路辉李荣兴俞小花于站良陈加希
Owner KUNMING METALLURGY INST
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