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Method of producing rutile titanium dioxide by sulfuric acid method and preparation method of double-effect seed crystal used

A technology of rutile 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 long process, complicated industrial application and difficulties of the double-effect seed crystal method, and achieve the best industrial application prospects, The effect of high crystal conversion activity and simple equipment

Inactive Publication Date: 2019-07-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for producing rutile titanium dioxide by the sulfuric acid method and a method for preparing double-effect seed crystals, so as to solve the problems that the existing methods for preparing double-effect seed crystals have long and complicated processes or are difficult for industrial application

Method used

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  • Method of producing rutile titanium dioxide by sulfuric acid method and preparation method of double-effect seed crystal used
  • Method of producing rutile titanium dioxide by sulfuric acid method and preparation method of double-effect seed crystal used
  • Method of producing rutile titanium dioxide by sulfuric acid method and preparation method of double-effect seed crystal used

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Effect test

Embodiment 1

[0035] Dilute the industrial titanium liquid to 30g / L, heat it through continuous coil equipment for 60s, and the outlet temperature is 96°C to obtain 1# seed crystal suspension. Take 50ml of industrial titanium solution with a concentration of 210g / L, an iron-titanium ratio of 0.25, and an F value of 1.9 in a three-necked flask, stir and heat, and after the titanium solution is heated to 96°C, add TiO 2 Add 2wt% of the prepared 1# seed crystal suspension, heat and stir for 10 minutes, and then heat up to boiling. After the hydrolyzate turns gray, stop heating and stirring immediately and mature for 30 minutes, then restart heating and stirring and heat up to boiling. After boiling for 50 minutes, add dilution water to adjust the concentration of the titanium solution to 160-170g / L, and continue boiling for 2.5 hours to end the hydrolysis, filter and wash the hydrolyzed slurry, and the measured hydrolysis rate reaches 96%. The filter cake was calcined at 850°C for 80 min, and...

Embodiment 2

[0037] Dilute the industrial titanium solution to 40g / L, and heat it through continuous coil equipment for 80s with an outlet temperature of 98°C to obtain 2# seed crystal suspension. Take 50ml of industrial titanium solution with a titanium solution concentration of 210g / L, an iron-to-titanium ratio of 0.25, and an F value of 1.9 in a three-necked flask, stir and heat, and after the titanium solution is heated to 96°C, add TiO 2 Add 2wt% of the prepared 2# seed crystal suspension, heat and stir for 10 minutes, and then heat up to boiling. After the hydrolyzate turns gray, stop heating and stirring immediately and mature for 30 minutes, then restart heating and stirring and heat up to boiling. Add dilution water after boiling for 50 minutes, adjust the concentration of titanium solution to 160-170g / L, and stop hydrolysis after boiling for 2.5 hours, filter and wash the hydrolyzed slurry, and measure the hydrolysis rate to reach 95%. The filter cake was calcined at 930°C for 3...

Embodiment 3

[0039] The laboratory made 20g / L titanium liquid, heated it through continuous coil equipment for 200s, and the outlet temperature was 90°C to obtain 3# seed crystal suspension. Take 50ml of industrial titanium solution with a concentration of 150g / L, iron-titanium ratio2 Add 0.5wt% of the prepared 3# seed crystal suspension, heat and stir for 15 minutes, and then heat up to boiling. After the hydrolyzate turns gray, stop heating and stirring immediately and mature for 20 minutes, then restart heating and stirring and heat up to boiling. After boiling for 50 minutes, add dilution water to adjust the concentration of the titanium solution to 130-170g / L, and continue boiling for 70 minutes to end the hydrolysis, filter and wash the hydrolyzed slurry, and measure the hydrolysis rate to reach 97%. The filter cake was calcined at 950°C for 120 min, and after calcining, it was ground and then measured by XRD. It was detected that the rutile content was 99%.

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Abstract

The invention discloses a method of producing rutile titanium dioxide by a sulfuric acid method and a preparation method of a double-effect seed crystal used. Titanium liquid is uniformly and quicklyheated up, pyrohydrolyzed and nucleated to generate the double-effect seed crystal with high hydrolysis activity and low temperature crystal transformation ability; the seed crystal, as an additionalseed crystal, is used for a hydrolysis reaction of the industrial titanium liquid to induce the hydrolysis reaction of the titanium liquid, is high in hydrolysis activity and can accelerate the hydrolysis reaction; a metatitanic acid product with uniform particle size distribution and moderate particle size is obtained; further, the metatitanic acid product is applied to a calcining section; and metatitanic acid can be quickly converted into a high-quality rutile titanium dioxide product at a low temperature after dehydration and desulfuration without adding a rutile calcining seed crystal additionally.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide production, in particular to a method for producing rutile titanium dioxide by a sulfuric acid method and a method for preparing double-effect seed crystals. Background technique [0002] Titanium dioxide, scientific name titanium dioxide, has excellent pigment performance and is widely used in coatings, plastics, ceramics, cosmetics and paper industry. There are three crystal forms of brook titanium, anatase and rutile in nature, of which only anatase and rutile are used. value. In the field of titanium dioxide, rutile titanium dioxide has a dense structure, low photochemical activity, resistance to ultraviolet radiation, and is not easy to pulverize outdoors, with good weather resistance and gloss, so it has stronger commercial value than anatase titanium dioxide . [0003] Among the two main titanium dioxide production processes of the sulfuric acid method and the chlorination method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/053C01P2002/72C01P2004/61C01P2004/62
Inventor 岳海荣李淑贞马奎唐思扬刘长军梁斌
Owner SICHUAN UNIV
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