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Process for producing rutile titanium dioxide by using low-grade titanium ore

A technology of rutile titanium dioxide and low-grade titanium, applied in the directions of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems affecting product quality and application performance indicators, increase of waste acid and water consumption, and increase of natural gas consumption, etc. Effects of ΔE reduction, oil absorption reduction, and raw material cost reduction

Active Publication Date: 2014-07-16
JINAN YUXING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the production process of titanium dioxide by sulfuric acid method mainly includes acid hydrolysis, purification, hydrolysis, water washing, salt treatment, calcination, coarse powder, wetting, grinding, coating, drying, crushing, packaging and other steps. High-grade titanium ore adopts The acid hydrolysis tank over 100m? 0.4% (based on the mass of titanium dioxide in the titanium ore used), and then add 0.1-0.45 zinc oxide (based on the mass of titanium dioxide in the titanium ore used), the calcining temperature of the rotary kiln needs to be above 900-1300 ° C, the process The main disadvantages are that the acid ore ratio is high and the reaction speed is fast. Because densely woven cloth is used for washing, the washing time is slightly longer, the amount of waste acid and water consumption increase, and the calcination temperature of the rotary kiln is higher, and the amount of natural gas is increased. At the same time It is easy to cause product sintering, affecting product quality and application performance indicators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 26.85 tons of low-grade titanium ore to 45 tons of sulfuric acid with a concentration of 92.5% according to the acid ore ratio of 1.55:1. After reacting for 4 hours, add 15 ppm polyacrylamide flocculant to the reaction solution for sedimentation treatment, and then use filter cloth warp and weft 519 / 220 water-washed leaf filter for filtration, and the filtrate is concentrated to Ti 4+ The concentration is 200g / L to obtain titanium solution. The titanium solution is hydrolyzed at a temperature of 95° C. to obtain metatitanic acid precipitates, and then the metatitanic acid precipitates are washed with water until the iron content reaches 10 ppm. Add 0.23% zinc oxide, 0.4% aluminum salt and 0.4% potassium salt (based on the mass of titanium dioxide in the titanium ore used) to the washed metatitanic acid precipitate for salt treatment, and then calcine at 870°C for 5h Afterwards, it is crushed with a Raymond machine and then wet-coated. The amount of silicon coati...

Embodiment 2

[0040] Add 25.85 tons of low-grade titanium ore to 45 tons of sulfuric acid with a concentration of 92.5% according to the acid ore ratio of 1.61:1. After reacting for 4 hours, add 15 ppm polyacrylamide flocculant to the reaction solution for sedimentation treatment, and then use filter cloth for latitude and longitude. 519 / 220 water-washed leaf filter for filtration, and the filtrate is concentrated to Ti 4+ The concentration is 200g / L to obtain titanium solution. The titanium solution is hydrolyzed at a temperature of 95° C. to obtain metatitanic acid precipitates, and then the metatitanic acid precipitates are washed with water until the iron content reaches 10 ppm. Add 0.23% zinc oxide, 0.4% aluminum salt and 0.4% potassium salt (based on the mass of titanium dioxide in the titanium ore used) to the washed metatitanic acid precipitate for salt treatment, and then calcine at 870°C for 5h Afterwards, it is crushed with a Raymond machine and then wet-coated. The amount of si...

Embodiment 3

[0042] Add 26.02 tons of low-grade titanium ore to 45 tons of sulfuric acid with a concentration of 92.5% according to the acid ore ratio of 1.6:1. After reacting for 4 hours, add 15 ppm polyacrylamide flocculant to the reaction solution for sedimentation treatment, and then use filter cloth warp and weft 519 / 220 water-washed leaf filter for filtration, and the filtrate is concentrated to Ti4+ The concentration is 200g / L to obtain titanium solution. The titanium solution is hydrolyzed at a temperature of 95° C. to obtain metatitanic acid precipitates, and then the metatitanic acid precipitates are washed with water until the iron content reaches 10 ppm. Add 0.23% zinc oxide, 0.4% aluminum salt and 0.4% potassium salt (based on the mass of titanium dioxide in the titanium ore used) to the washed metatitanic acid precipitate for salt treatment, and then calcine at 870°C for 5h Afterwards, it is crushed with a Raymond machine and then wet-coated. The amount of silicon coating is ...

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Abstract

The invention relates to a process for producing rutile titanium dioxide by using low-grade titanium ore and belongs to the technical field of production of titanium dioxide. The process is a sulfuric acid method. The improvement is as follows: the acid-ore ratio is 1.55-1.61:1; the warp / weft ratio of filtering cloth of a washing leaf filter is 519 / 220; in the process of salt treatment, the added amount of zinc oxide is 0.2-0.5%; the calcination temperature is 800-1200 DEG C. When the high-grade titanium ore is used, the calcination temperature of a rotary kiln is 900-1300 DEG C; since the content of phosphorus in the low-grade titanium ore is high, in order to reach the same conversion rate with the high-grade titanium ore, the calcination temperature of the rotary kiln needs to be improved. But since the addition amount of zinc oxide is increased in the process of salt treatment, even though the calcination temperature of the rotary kiln is reduced to 800-1200 DEG C, the conversion rate can reach more than 98%, and simultaneously the sintering of materials due to overhigh conversion rate is avoided; the prepared titanium dioxide can reach the national standards.

Description

technical field [0001] The invention relates to a process for producing rutile titanium dioxide from low-grade titanium ore, and belongs to the technical field of titanium dioxide production. Background technique [0002] The production of rutile titanium dioxide is a fine chemical industry, the production process is long, the control is difficult, and it is greatly affected by raw materials, especially the grade of titanium ore and titanium slag has an important impact on the production and quality of titanium dioxide. [0003] At present, the main sources of titanium ore for domestic titanium dioxide enterprises are divided into domestic titanium ore and imported titanium ore. The import of titanium dioxide is restricted, and the demand for titanium ore from titanium dioxide production enterprises is gradually shifting from import to domestic. In addition, high-grade imported titanium ore is used as raw material to produce titanium dioxide, and its production cost is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 宋代磊马书文吴兆栋董鲁燕杨艳梅李鑫许红
Owner JINAN YUXING CHEM
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