Preparation method of titanium dioxide

Abstract

The invention discloses a preparation method of titanium dioxide and belongs to the technical field of fluorine chemical engineering. According to the method, titanium tetrafluoride gas reacts with water vapor under the condition of 200-600 DEG C, titanium dioxide is generated, the whole reaction is performed in a gas phase environment, corrosion to equipment by raw materials and a product is avoided, a by-product is easy to recycle, and the safety of the technological process is improved. Further, anhydrous hydrogen fluoride and ferric oxide react at the temperature of 300-500 DEG C to generate iron (III) fluoride, iron (III) fluoride and ilmenite react at the temperature of 1,100-1,500 DEG C to generate titanium tetrafluoride serving as a raw material, and closed cycle of the by-product hydrogen fluoride is realized; meanwhile, a mixture of byproduct ferric oxide and ferrous oxide is oxidized and can return to a reaction for recycling, and clean production is realized while the production cost is reduced.

Description

technical field

[0001] The invention belongs to the technical field of fluorine chemical industry, and in particular relates to a preparation method of titanium dioxide. Background technique

[0002] Titanium dioxide, titanium dioxide, chemical formula TiO 2 , a white solid or powder amphoteric oxide with a molecular weight of 79.87. It is a white inorganic pigment with non-toxicity, best opacity, best whiteness and brightness. It is considered to be the best performance in the world. white paint. Titanium dioxide has strong adhesion, is not easy to undergo chemical changes, and is always white. Widely used in paint, plastic, paper, printing ink, chemical fiber, rubber, cosmetics and other industries. It has a high melting point and is also used to make fire-resistant glass, glaze, enamel, clay, and high-temperature-resistant experimental vessels. There are two commonly used production methods: Sulphate Process and Chloride Process. Among them, 56% are chlorination prod...

Examples

Embodiment 1

[0025] The preparation method of titanium dioxide in this embodiment is specifically: 1.42kg of titanium tetrafluoride gas is hydrolyzed with 0.41kg of water vapor at 600°C for 0.5 hours to generate 1.0kg of gas-phase titanium dioxide primary particles and 0.95kg of hydrogen fluoride; 1.0kg of titanium dioxide is produced once The particles are aggregated into aggregated particles through the concentrator, and then separated by cyclone, deacidified by two-stage air jet, and screened by ebullating bed to obtain 0.85kg of titanium dioxide. Wherein titanium tetrafluoride is commercially available.

Embodiment 2

[0027] The preparation method of titanium dioxide in this embodiment is specifically: 1.35kg of titanium tetrafluoride gas is hydrolyzed with 0.39kg of water vapor at 200°C for 2 hours to generate 0.95kg of gas-phase titanium dioxide primary particles and 0.9kg of hydrogen fluoride; 0.95kg of titanium dioxide once The particles are aggregated into aggregated particles through the concentrator, and then separated by cyclone, deacidified by two-stage air jet, and screened by ebullating bed to obtain 0.8kg of titanium dioxide. Wherein titanium tetrafluoride is commercially available.

Embodiment 3

[0029] The preparation method of present embodiment titanium dioxide, specific technological process is as follows figure 1 As shown, the specific operation steps are as follows:

[0030] 1) React 50 mol of anhydrous hydrogen fluoride with 8 mol of ferric oxide in a fluidized bed at 500°C for 0.2 hours to obtain 2.2 kg of ferric trifluoride solid, and produce 0.55 kg of fluorine-containing water vapor as a by-product after being absorbed by sodium hydroxide solution cryolite;

[0031] 2) 2.2kg of ferric trifluoride obtained in step 1) is mixed with ilmenite, wherein the molar ratio of ferric trifluoride and ferric titanate in ilmenite is 4.5:3.0, and placed in a rotary kiln at 1500°C for 5 hour, generate 1.55Kg titanium tetrafluoride crude gas, and obtain 1.42kg high-quality titanium tetrafluoride gas after rectification and purification; wherein the by-product ferric oxide and ferrous oxide mixture reacts with oxygen to produce ferric oxide return to step 1);

[0032] 3) 1...

technical field

[0001] The invention belongs to the technical field of fluorine chemical industry, and in particular relates to a preparation method of titanium dioxide. Background technique

[0002] Titanium dioxide, titanium dioxide, chemical formula TiO 2 , a white solid or powder amphoteric oxide with a molecular weight of 79.87. It is a white inorganic pigment with non-toxicity, best opacity, best whiteness and brightness. It is considered to be the best performance in the world. white paint. Titanium dioxide has strong adhesion, is not easy to undergo chemical changes, and is always white. Widely used in paint, plastic, paper, printing ink, chemical fiber, rubber, cosmetics and other industries. It has a high melting point and is also used to make fire-resistant glass, glaze, enamel, clay, and high-temperature-resistant experimental vessels. There are two commonly used production methods: Sulphate Process and Chloride Process. Among them, 56% are chlorination prod...

Examples

Embodiment 1

[0025] The preparation method of titanium dioxide in this embodiment is specifically: 1.42kg of titanium tetrafluoride gas is hydrolyzed with 0.41kg of water vapor at 600°C for 0.5 hours to generate 1.0kg of gas-phase titanium dioxide primary particles and 0.95kg of hydrogen fluoride; 1.0kg of titanium dioxide is produced once The particles are aggregated into aggregated particles through the concentrator, and then separated by cyclone, deacidified by two-stage air jet, and screened by ebullating bed to obtain 0.85kg of titanium dioxide. Wherein titanium tetrafluoride is commercially available.

Embodiment 2

[0027] The preparation method of titanium dioxide in this embodiment is specifically: 1.35kg of titanium tetrafluoride gas is hydrolyzed with 0.39kg of water vapor at 200°C for 2 hours to generate 0.95kg of gas-phase titanium dioxide primary particles and 0.9kg of hydrogen fluoride; 0.95kg of titanium dioxide once The particles are aggregated into aggregated particles through the concentrator, and then separated by cyclone, deacidified by two-stage air jet, and screened by ebullating bed to obtain 0.8kg of titanium dioxide. Wherein titanium tetrafluoride is commercially available.

Embodiment 3

[0029] The preparation method of present embodiment titanium dioxide, specific technological process is as follows figure 1 As shown, the specific operation steps are as follows:

[0030] 1) React 50 mol of anhydrous hydrogen fluoride with 8 mol of ferric oxide in a fluidized bed at 500°C for 0.2 hours to obtain 2.2 kg of ferric trifluoride solid, and produce 0.55 kg of fluorine-containing water vapor as a by-product after being absorbed by sodium hydroxide solution cryolite;

[0031] 2) 2.2kg of ferric trifluoride obtained in step 1) is mixed with ilmenite, wherein the molar ratio of ferric trifluoride and ferric titanate in ilmenite is 4.5:3.0, and placed in a rotary kiln at 1500°C for 5 hour, generate 1.55Kg titanium tetrafluoride crude gas, and obtain 1.42kg high-quality titanium tetrafluoride gas after rectification and purification; wherein the by-product ferric oxide and ferrous oxide mixture reacts with oxygen to produce ferric oxide return to step 1);

[0032] 3) 1...

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