Method for clean production of titanium dioxide by using sodium hydroxide

A technology of sodium hydroxide and titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, fibrous filler, etc., can solve the problems of cumbersome steps and high production costs, and achieve lower reaction temperature, lower cost, and lower production energy consumption Effect

Active Publication Date: 2009-09-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The steps of this invention are loaded down with trivial details, and various auxiliary materials are added, and the production cost is higher

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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 The mass content is 87.0%), mixed evenly under stirring, and reacted at 500°C for 0.5 hour, wherein, the mass ratio of NaOH and high-titanium slag was 1:1, and a solid intermediate product was obtained after the reaction. At this time, the decomposition rate of high-titanium slag was 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...

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 room 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 Ruti...

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 is 3:1, and a solid intermediate product is obtained after the reaction, and the decomposition rate of high titanium slag is 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 1:50. After reacting for 6 hours, filter the product, add sulfuric acid solution to dissolve, and adjust the pH value to 0.25. After the product is dissolved at 35°C, add iron sheet as a reducing agent, so that All the ferric iron is converted into ferrous iron, and then the obtained titanium solution is filtered, and the filtrate is hydrolyzed at 40°C for 15 hours, a...

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Abstract

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 self-powder) from high-titanium slag and using sodium hydroxide. Using high-titanium slag as raw material, make it react with sodium hydroxide at 350-550°C to prepare an intermediate product, then wash (or carbonate), acid dissolve, reduce, hydrolyze, and calcinate the intermediate product to prepare anatase or Rutile titanium dioxide. The alkali cycle, acid cycle and separation technology of the present invention greatly reduces production energy consumption, simplifies the production process, reduces equipment investment, improves process operability, and provides comprehensive utilization of titanium resources and preparation of titanium dioxide (titanium dioxide) an effective way.

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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Patent Type & Authority Patents(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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