Method for clean production of titanium dioxide by using potassium hydroxide

A technology of potassium hydroxide and titanium dioxide, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, and fibrous fillers, can solve the problems of low discharge of "three wastes", good product quality, and short process flow, and achieve technical difficulty and The effect of reducing equipment investment costs, reducing production energy consumption, and reducing reaction temperature

Active Publication Date: 2008-05-07
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of the production process of the chlorination method is late, the product quality is good, the process flow is short, and the discharge of "three wastes" is small, but its disadvantage is that it has high quality requirements for titanium raw materials, mainly using TiO 2 For natural rutile and artificial rutile with a content greater than 90%, only companies in a few countries (DuPont, Midland Chemical, Kerr McGee, etc.) have mastered this technology. Moreover, it can only produce rutile type and cannot produce anatase type. These shortcomings have seriously affected the development and promotion of chloride technology.

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  • Method for clean production of titanium dioxide by using potassium hydroxide

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Experimental program
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Effect test

Embodiment 1

[0027] The KOH solution that is circulated back to the reactor and the high titanium slag (TiO 2 The mass content is 87.0%) and mix evenly under stirring, react at 450 ℃ for 0.5 hour, wherein, the mass ratio of high-titanium slag and solid KOH is 1.5:1, obtain solid intermediate product after reaction, at this moment, high-titanium slag decomposition rate is 100%. The intermediate product was washed twice with water at a washing temperature of 55°C, and the solid-to-liquid mass ratio of each wash was 1:10. The filtered product was added to a sulfuric acid solution to adjust the pH value of the system to 0.10. The product was completely dissolved at 45°C, and then iron was added. The powder is used as a reducing agent to convert all ferric iron into ferrous iron. Finally, the obtained titanium solution was filtered, and the filtrate was hydrolyzed at 80°C for 8 hours, and the hydrolyzed product was filtered to obtain a white hydrated titanium dioxide solid, which was calcined ...

Embodiment 2

[0029] The KOH solution that is circulated back to the reactor and the high titanium slag (TiO 2 The mass content is 87.0%) were mixed evenly under stirring, and reacted at 380° C. for 2 hours, wherein the mass ratio of high titanium slag to KOH solid was 0.6:1, and a solid intermediate product was obtained after the reaction, and the decomposition rate of high titanium slag was 98%. The intermediate product is washed with water at normal temperature, the washing solid-liquid mass ratio is 1:100, hydrochloric acid solution is added to the product obtained after filtration, the pH value of the system is adjusted to 0.15, and the unreacted high-titanium slag is filtered out after fully dissolving at normal temperature, and then Add sodium sulfite to the solution to reduce ferric iron to ferrous iron, then filter the obtained titanium solution, hydrolyze the filtrate at 110°C for 4 hours, and filter the hydrolyzed product to obtain a white hydrated titanium dioxide solid, calcinin...

Embodiment 3

[0031] The KOH solution that is circulated back to the reactor and the high titanium slag (TiO 2The mass content is 89.5%) and mixed evenly under stirring, and reacted at 500° C. for 0.5 hours, wherein the mass ratio of high titanium slag to KOH solid was 1:1, and a solid intermediate product was obtained after the reaction, and the decomposition rate of high titanium slag was 100%. Add water and mix the solid intermediate product evenly, carry out the carbonation reaction of the intermediate product at 50°C, and pass CO into the solution 2 The partial pressure is 2MPa, and the solid-liquid mass ratio of the reaction is 1:100. After reacting for 4 hours, filter the product, add hydrochloric acid solution to dissolve, adjust the pH value of the system to 0.30, and dissolve the product completely at 60°C, and then add iron sheet as a reduction agent. agent to convert ferric iron into ferrous iron, then the solution was hydrolyzed at 40°C for 15 hours, and the hydrolyzed product ...

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Abstract

The invention belongs to the preparation of inorganic metallic compound and the processing filed of mineral resource, in particular to a preparation method for preparing titanium dioxide (titanium pigment) through high titanium slag and sodium hydroxide without pollution. The invention is characterized in that the high titanium slag is taken as the raw material; the high titanium slag and the potassium hydroxide having temperature range from 350 DEG C to 550 DEG C are reacted to prepare a medium product; the medium product is then washed through water (or carbonatation), acid solubled, reduced, hydrolyzed and burned to prepare anatase or rutile titanium dioxide. The alkali circulation, the acid circulation and the separation technology of the invention greatly reduce the production energy consumption, simplify the production process, reduce the device investment and increase the technology maneuverability, thereby providing an effective method for the comprehensive use of the titanium resource and the preparation of titanium dioxide (titanium pigment).

Description

technical field [0001] The invention belongs to the field of preparation of inorganic metal compounds and processing of mineral resources, and in particular relates to a method for cleanly producing titanium dioxide (titanium dioxide) from high-titanium slag and potassium hydroxide. technical background [0002] Titanium dioxide, commonly known as titanium dioxide, is an important raw material in the chemical industry. It is non-toxic and harmless to health. It is the most important white pigment, accounting for 80% of all white pigments. It is also the most important product of titanium series. 90% of the titanium resources in the world are used to manufacture titanium dioxide. Titanium dioxide is widely used in many fields of modern industry, agriculture, national defense, science and technology, and is closely related to people's life and national economy. [0003] High-titanium slag titanium-rich material is currently the most widely used high-quality raw material with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053C01G23/08C09C1/36
Inventor 王丽娜齐涛薛天艳张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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