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Methods for preparing and using crystal seeds of rutile in high activity

A rutile and high-activity technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of reduced efficiency, low seed crystal activity, and increased power consumption, and achieve the goal of reducing alkali consumption, increasing activity, and improving efficiency Effect

Inactive Publication Date: 2007-12-26
朱贤荣 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rutile seed crystals in this process are generally prepared by the process described in Chinese Invention Patent Publication CN1594103A and similar processes, generally adopting a method in which the alkali-titanium ratio (sodium hydroxide: metatitanic acid, mass ratio) is greater than 1.7:1 at normal temperature After mixing, heat up and boil for alkali boiling, then dilute and hydrolyze, wash and remove impurities, add acid to neutralize, acid dissolve, cool and other steps to prepare the seed crystal. The disadvantage is that the seed crystal can only be used in the bleaching process, and the seed crystal Low activity, low calcining capacity of rotary kiln
In addition, after the rutile seed is added to the rinsing process, the rinsing speed will greatly reduce the efficiency compared with the rinsing in the production process of anatase titanium dioxide, that is, the rinsing time will be greatly extended, the production capacity will be reduced, and the water consumption and power consumption will increase significantly. It is necessary to build a metatitanic acid recovery system separately for the rinsing process so as to be completely separated from the anatase production line, thereby increasing investment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 500ml of metatitanic acid with a concentration of 280g / l and heat it to 65°C for later use. After heating 320ml of sodium hydroxide solution with a concentration of 700g / l to 90°C, add the preheated metatitanic acid evenly into the Alkali dissolution is carried out in sodium hydroxide solution under constant stirring, the ratio of alkali to titanium is 1.6:1, after the addition is completed, the temperature is raised to boil and kept boiling for 120 minutes. Stop heating after the alkali dissolution is completed, add 140g of water and cool the alkali soluble matter to 70°C with a cooling device. Filtrate once and wash with water until the NaOH content in the washing liquid is 5g / l. Add water to the filter cake to make a slurry with a concentration of 180g / l, then add hydrochloric acid to adjust the acid, adjust the pH to 2.4, place it under stirring at 20°C for 8 hours, then filter it twice, wash with water until the conductivity of the washing liquid is 300 μS / cm ...

Embodiment 2

[0019] Rutile seed crystals were prepared as in Example 1, except that the alkali-titanium ratio during alkali dissolution was 1.2:1, that is, the concentration of 700 g / l of sodium hydroxide solution was 240 ml. The detection indexes of the prepared rutile seed crystals are shown in Table 1, and the application properties are shown in Table 2.

Embodiment 3

[0021] The rutile seed crystals were prepared as in Example 1, except that the concentration of metatitanic acid was 250 g / l and the volume was 560 ml during alkali dissolution. The detection indexes of the prepared rutile seed crystals are shown in Table 1, and the application properties are shown in Table 2.

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Abstract

This invention relates to a process for producing rutile-type titanium dioxide powder, especially a method for preparing high-activity rutile seed crystal for titanium dioxide powder production. The method comprises: (1) adding 50-70 deg.C metatitanic acid into 80-100 deg.C NaOH solution at a ratio of 1:(1.2-2.5), and dissolving; (2) cooling, washing with water, preparing into 100-250 g / L slurry, and adding HCl to adjust the pH value to 2.0-3.1; (3) hydrolyzing under stirring for 2-24 h; (4) controlling the electric conductivity of the washing solution less than or equal to 400 mu.S / cm, or pNa greater than or equal to 2.5 for washing during titanic acid hydrolysis process; (5) adding HCl at an acid / titanium ratio of (0.19-0.35):1 for dissolution at 50-70 deg.C; (6) adding water to dilute, and cooling to a seed crystal concentration of 90-110 g / L. This invention has such advantages as high rutile seed crystal activity, high titanium dioxide powder rotary kiln productivity, high titanium dioxide powder quality, and high titanium dioxide powder production efficiency.

Description

technical field [0001] The invention relates to a production process of rutile titanium dioxide, in particular to a method for preparing and using a high-activity rutile seed crystal for the production of rutile titanium dioxide. Background technique [0002] The main component of titanium dioxide is TiO 2 , is one of the most widely used white pigments, and industrial production includes two types of crystal products, namely anatase and rutile. The production process of titanium dioxide mainly includes sulfuric acid method and chlorination method, among which sulfuric acid method is the most widely used production technology in China at present. The production process of sulfuric acid titanium dioxide mainly includes acid hydrolysis of titanium ore, precipitation of titanium liquid, filtration of titanium liquid, crystallization of titanium liquid, separation of ferrous iron, concentration of titanium liquid, hydrolysis of titanium liquid, washing with metatitanic acid, bl...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 朱贤荣廖向阳谢宏伟
Owner 朱贤荣
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