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Process for calcining metatitanic acid in titanium dioxide production

A calcination process and metatitanic acid technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of difficult calcination quality and large environmental impact, and achieve the improvement of three major quality indicators of calcination, uniform heating, and reduction of exhaust gas emissions Effect

Inactive Publication Date: 2015-03-25
TIANJIN KAITELONG WELDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The calcination process is a complex physical and chemical change process, and it involves tail gas treatment and emission, which has a great impact on the environment. In addition, there are many influencing factors in the calcination process, which makes it difficult to control the calcination quality. Comprehensive quantitative analysis of various effects The relationship between factors and calcination quality is still a difficult point in the production of sulfuric acid rutile titanium dioxide. How to optimize the calcination process conditions and effectively improve the three major quality indicators of calcination is of great importance for large-scale production of high-quality rutile titanium dioxide. Scientific research value and practical significance

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  • Process for calcining metatitanic acid in titanium dioxide production
  • Process for calcining metatitanic acid in titanium dioxide production
  • Process for calcining metatitanic acid in titanium dioxide production

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Metatitanic acid pretreatment: Add a mixed salt solution of sodium phosphate, potassium carbonate, and magnesium bicarbonate to the metatitanic acid slurry to form a metatitanic acid suspension, and the addition amount is respectively TiO 2 0.1%, 0.4%, 0.2%, through the filter device to form a filter cake.

[0023] (2) The particle median diameter D50 is 1.0-1.5 μm, the water content is 50%-60%, Fe 2 o 3 The metatitanic acid filter cake with a content of less than 30ppm is sent to the low temperature section at the end of the rotary kiln, and the feed amount is 6.5m 3 / h, so that the rotary kiln with a 4° inclination angle rotates at a speed of 8rpm, so that the material rotates in the kiln body and moves to the front of the kiln at a certain speed, and the premixed gas fuel and the processed calcination tail gas are added from the kiln head to control the kiln. The temperature of the first inner slip ring is 920°C. The high-temperature gas generated by combustion...

Embodiment 2

[0033] (1) Metatitanic acid pretreatment: Add a mixed salt solution of sodium phosphate, potassium carbonate, and magnesium bicarbonate to the metatitanic acid slurry to form a metatitanic acid suspension, and the addition amount is respectively TiO 2 0.2%, 0.2%, 0.5%, through the filter device to form a filter cake.

[0034] (2) The particle median diameter D50 is 1.0-1.5 μm, the water content is 45%-55%, Fe 2 o 3 The metatitanic acid filter cake with a content of less than 30ppm is sent to the low temperature section at the end of the rotary kiln, and the feed amount is 6.5m 3 / h, make the rotary kiln with a 4° inclination angle rotate at a speed of 10rpm, so that the material rotates in the kiln body and moves to the front of the kiln at a certain speed, and the premixed gas fuel and the processed calcination tail gas are added from the kiln head to control the kiln. The temperature of the first inner slip ring is 900°C. The high-temperature gas generated by combustion fl...

Embodiment 3

[0044] (1) Metatitanic acid pretreatment: Add a mixed salt solution of sodium phosphate, potassium carbonate, and magnesium bicarbonate to the metatitanic acid slurry to form a metatitanic acid suspension, and the addition amount is respectively TiO 2 0.2%, 0.4%, 0.2%, through the filter device to form a filter cake.

[0045] (2) The particle median diameter D50 is 1.0-2.0 μm, the water content is 60%-70%, Fe 2 o 3 The metatitanic acid filter cake with a content of less than 30ppm is sent to the low-temperature section at the end of the rotary kiln, and the feed amount is 5.5m 3 / h, make the rotary kiln with a 4° inclination angle rotate at a speed of 10rpm, so that the material rotates in the kiln body and moves to the front of the kiln at a certain speed, and the premixed gas fuel and the processed calcination tail gas are added from the kiln head to control the kiln. The temperature of the first inner slip ring is 900°C. The high-temperature gas generated by combustion fl...

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Abstract

The invention relates to a process for calcining metatitanic acid in titanium dioxide production. The process comprises the following steps: pretreating the metatitanic acid, calcining the metatitanic acid in a rotary kiln and calcining tail gases. According to the process, the calcined tail gases are recycled, and the primary air is replaced by the calcined tail gases, thus the discharge of exhaust gases can be reduced, and partial clean production can be realized. In addition, because the fuel gases and the treated calcined tail gases are premixed, the uniform and strong oxidation reaction can be promoted effectively, the materials can be heated uniformly, and the problem that a certain amount of particles are overburnt or underburnt can be alleviated effectively. Moreover, according to the process, the relationship between various factors and calcining quality is analyzed comprehensively and quantitatively so that the calcining condition can be optimized and the three major calcining-quality indexes can be improved effectively. The process provided by the invention has very important practical and application values.

Description

technical field [0001] The invention belongs to the production field of rutile titanium dioxide, and in particular relates to a calcination process of metatitanic acid in the production process of rutile titanium dioxide. Background technique [0002] Titanium dioxide is a white pigment with a wide range of uses. It is widely used in various fields of the national economy. There are two methods for industrial large-scale production of titanium dioxide: sulfuric acid method and chlorination method. The chlorination method is generally more advanced than the sulfuric acid method, but it is affected by Due to technical limitations, the domestic production of titanium dioxide is still dominated by the sulfuric acid process. In the sulfuric acid process, the calcination of metatitanic acid is one of the key processes that determine the quality of the final product. [0003] Calcination quality has a great influence on the quality of titanium dioxide, especially on the main qualit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08
CPCC01G23/08
Inventor 曹洪清任小弟张树芳曹福利刘德春
Owner TIANJIN KAITELONG WELDING MATERIAL