Method for producing rutile type white titanium pigment by using crystal seed method of double action

A technology of rutile-type titanium dioxide and double-effect seed crystals, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high calcination temperature, low output, long time, etc. nuclear easy effect

Inactive Publication Date: 2003-05-07
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although some domestic manufacturers can also produce rutile titanium dioxide, the calcination temperature is high (1000°C), the time is long (9 hours), the cost is high, and the output is low, which has become one of the bottlenecks restricting the production of this product.

Method used

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  • Method for producing rutile type white titanium pigment by using crystal seed method of double action
  • Method for producing rutile type white titanium pigment by using crystal seed method of double action
  • Method for producing rutile type white titanium pigment by using crystal seed method of double action

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] TiOCl 2 Solution (concentration: containing TiO 2 0.160g / ml) 60 parts, under stirring, with 120 parts of NH 4 Add OH (concentration 5N) solution into the reactor, adjust the pH value to less than 1.5, and keep it warm for 20 minutes; add 200 parts of SnCl 2 2H 2 O solution (concentration is 0.153g / ml), adjust the pH value to 2.5, add H 2 o 2 to guarantee Sn 2+ becomes Sn 4+ , keep warm for half an hour, then let it stand still for 4 hours, suck off the supernatant to obtain a suspension of seed crystals.

[0021] Take 1500ml of the titanium solution used in the production of sharp titanium dioxide, add the above-prepared seed crystal suspension at 70°C, boil at 110°C for 3 hours, wash with water, and control the Fe 2+ , Fe 3+ The content of which is less than 0.003%, is suction filtered and dried to obtain metatitanic acid powder.

[0022] Salt treatment introduces impurity ions: metatitanic acid dry powder: KNO 3 : ZnCl 2 :H 2 The ratio of O=100:0.34:0.6:10...

Embodiment 2

[0025] TiOCl 2 Solution (concentration: containing TiO 2 0.160g / ml) 60 parts, under stirring, with 120 parts of NH 4 Add OH (concentration 5N) solution into the reactor, adjust the pH value to less than 1.5, and keep it warm for 20 minutes; take SnCl 2 2H 2 Add 150 parts of O solution (0.153g / ml concentration), adjust the pH value to 2.5, add H 2 o 2 to guarantee Sn 2+ becomes Sn 4+ . After adding, keep warm for half an hour, then let it stand still for 4 hours, absorb the supernatant liquid, and obtain a suspension of seed crystals.

[0026] Take 1500ml of the titanium solution used in the production of sharp titanium dioxide, add the above-prepared seed crystal suspension at 80°C, boil at 110°C for 3 hours, wash with water, and control the Fe 2+ , Fe 3+ The content of which is less than 0.003%, is suction filtered and dried to obtain metatitanic acid powder.

[0027] Salt treatment introduces impurity ions: metatitanic acid dry powder: KNO 3 : ZnCl 2 :H 2 The ra...

Embodiment 3

[0030] TiOCl 2 Solution (concentration: containing TiO 2 0.160g / ml) 60 parts, under stirring, with 120 parts of NH 4 Add OH (concentration 5N) solution into the reactor, adjust the pH value to less than 1.5, and keep it warm for 20 minutes; take SnCl 2 2H 2 Add 150 parts of O solution (concentration: 0.153g / ml), and use NH 4 OH to adjust the pH value to 2.5, add H 2 o 2 to guarantee Sn 2+ becomes Sn 4+ . After adding, keep warm for half an hour, then let it stand still for 4 hours, absorb the supernatant liquid, and obtain a suspension of seed crystals.

[0031] Take 1500ml of the titanium liquid used in the production of sharp titanium dioxide, add the above-prepared seed crystal suspension at 80°C, boil at 110°C for 3 hours, wash with water, and control the Fe 2+ , Fe 3+ The content of which is less than 0.003%, is suction filtered and dried to obtain metatitanic acid powder.

[0032]Calcination: heat preservation at 500°C for 40 minutes, heat preservation at 870°...

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Abstract

A process for preparing rutile-type titanium pigment powder by dual-effect crystal seed method includes such steps as preparing dual-effect crystal seeds, hydrolyzing titanium liquid while adding the crystal seeds while plays the role of crystal nucleus of hydrolized metatitanic acid particle, and calcining where it plays the role of the crystal nucleus for rutile-type phase change. Its advantages are low calcining temp, low cost and high output.

Description

Technical field [0001] The present invention relates to a process for producing rutile titanium dioxide by a sulfuric acid method, in particular to a method for producing rutile titanium dioxide by a double-effect seed crystal method, in which the anatase titanium dioxide is produced by a sulfuric acid method by cultivating a double-effect crystal seed , in the hydrolysis step of the titanium solution, the double-effect seed crystals prepared are added, and the seed crystals first appear as the crystal nuclei of the metatitanic acid hydrolyzed particles, and then in the calcination process, as the crystal nuclei of the rutile phase transition, to To achieve the purpose of rapid phase change at a lower temperature. Background technique [0002] my country is extremely rich in ilmenite resources, and the production process of titanium dioxide basically adopts the sulfuric acid method. Most manufacturers can only produce sharp products with low added value and the market is in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047C01G23/053
Inventor 郭俊怀
Owner NANKAI UNIV
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