Method for clean production of titanium dioxide by using sodium hydroxide

A sodium hydroxide and titanium dioxide technology, applied in the directions of titanium dioxide, titanium oxide/hydroxide, fibrous fillers, etc., can solve the problems of complicated steps and high production costs, and achieve the advantages of reducing reaction temperature, low cost and reducing production energy consumption. Effect

Active Publication Date: 2008-05-07
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Method for clean production of titanium dioxide by using sodium hydroxide
  • Method for clean production of titanium dioxide by using sodium hydroxide

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Effect test

Embodiment 1

[0027] The NaOH solution that is circulated back to the reactor and the high titanium slag (TiO 2 mass content is 87.0%) mixed under stirring, reacted at 500 ℃ for 0.5 hour, wherein, the mass ratio of NaOH and high titanium slag was 1: 1, obtained solid intermediate product after the reaction, at this moment, high titanium slag decomposition rate 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 washing was 1:20. The filtered product was added with sulfuric acid solution to adjust the pH value to 0.12. After it was completely dissolved at room temperature, iron powder was added as a reducing agent. Transform 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 at 650°C for 7 hours to obtain anata...

Embodiment 2

[0029] The NaOH solution that is circulated back to the reactor and the high titanium slag (TiO 2 The mass content is 91.0%), mixed evenly under stirring, and reacted at 450° C. for 5 hours, wherein the mass ratio of high titanium slag to NaOH solid was 2:1, and a solid intermediate product was obtained after the reaction, and the decomposition rate of high titanium slag was 99%. Wash the intermediate product with water at normal temperature, the washing solid-liquid mass ratio is 1:100, add hydrochloric acid solution to the product obtained after filtration to adjust the pH value to 0.25, fully dissolve at 60°C, filter out unreacted high-titanium slag, and then Sodium sulfite is added to the solution to reduce ferric iron to ferrous iron, and then the obtained titanium solution is filtered, the filtrate is hydrolyzed at 110°C for 4 hours, and the hydrolyzed product is filtered to obtain a white hydrated titanium dioxide solid, which is calcined at 950°C for 8 hours to obtain ...

Embodiment 3

[0031] The NaOH solution that is circulated back to the reactor and the high titanium slag (TiO2 The mass content is 90.5%), mixed evenly under stirring, and reacted at 350° C. for 2 hours, wherein the mass ratio of high titanium slag to NaOH solid was 3:1, 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, the solid-liquid mass ratio of the reaction is 1:50, the product is filtered after 6 hours of reaction, and sulfuric acid solution is added to dissolve, and the pH value is adjusted to 0.25. After the product is dissolved at 35°C, iron sheet is added as a reducing agent to make All ferric iron is converted into ferrous iron, and then the obtained titanium solution is filtered, and the filtrate is hydrolyzed at 40°C...

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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 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 sodium hydroxide having temperature range from 350 DEG C to 550DEG 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 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 using sodium hydroxide. Background technique [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 wit...

Claims

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Application Information

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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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