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Rotary kiln for calcining titanium dioxide by sulfuric acid method

A technology of titanium dioxide and rotary kiln, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of color fading rate, fluctuation of hiding power, unstable product quality, and low output of a single equipment, so as to improve the transmission efficiency , avoid long-term contact and material sintering, and ensure the effect of high temperature residence time

Active Publication Date: 2015-03-11
GUANGXI JINMAO TITANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common problems in the existing titanium dioxide rotary kiln calcination process are: 1. High energy consumption, generally 2.8-3 million kcal per ton of titanium dioxide; 2. Low equipment utilization rate, low output of a single equipment, generally The annual output of the rotary kiln is only about 20,000 tons; 3. The product quality is unstable, especially the whiteness, color loss rate, and hiding power fluctuate very seriously

Method used

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  • Rotary kiln for calcining titanium dioxide by sulfuric acid method
  • Rotary kiln for calcining titanium dioxide by sulfuric acid method

Examples

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Effect test

Embodiment 1

[0016] Such as figure 1 As shown, the rotary kiln used for calcining titanium dioxide has an inner diameter of 2.5m, a length of 50m, and a slope of 6%. An inverted bell mouth is set at a distance of 3.5m from the outlet of the high temperature section, and the inverted bell mouth is made of anti-stripping and anti-corrosion material. Special refractory materials, wherein the inclination angle between the constriction port (2) and the axis of the cylinder is 12°, the horizontal length is 2m, the length of the throat (3) is 400mm, and the inclination angle between the expansion port (4) and the axis of the cylinder is 20°. Such as figure 2 As shown, 8 lifting plates (1) are arranged in front of the inverted bell mouth, the length of the lifting plates is 1.5m, the height is 80mm, and the width is 80mm. During production, adjust the rotation speed to 3 minutes / circle.

[0017] The rotary kiln of the present invention increases the inclination of the cylinder, improves the ro...

Embodiment 2

[0019] Rotary kiln for calcination of titanium dioxide, the inner diameter of the cylinder is 3m, the length is 50m, the slope is set to 7%, and the inverted bell mouth is set 5.5m away from the discharge port of the high temperature section. Materials, wherein the inclination angle between the shrinkage port and the cylinder axis is 15°, the horizontal length is 2.5m, the throat length is 600mm, and the inclination angle between the expansion port and the cylinder axis is 25°. There are 8 lifting plates in front of the inverted bell mouth. The length of the lifting plates is 2.5m, the height is 120mm, and the width is 80mm. During production, adjust the rotation speed to 2.5 minutes / circle.

[0020] Adopt the rotary kiln in the present embodiment, the used white coal of every ton of titanium dioxide drops to 350 kilograms per ton by 450 kilograms, and energy consumption reduces more than 20%; Increased by 80%; the first-class rate of product quality increased from 80% to 98%...

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Abstract

The invention discloses a rotary kiln for calcining titanium dioxide by a sulfuric acid method. The rotary kiln comprises a barrel body, a combustion chamber and a kiln tail cover, wherein the middle barrel body is supported by three groups of supporting wheels; the two ends of the barrel body are sealed with sealing fins; the sealing fins are arranged in a fish-scale shape; the gradient of the barrel body is 6-8%; an inverted horn mouth is arranged in a position of the barrel body with a distance of 3.5-5.5 m from a discharge hole; the inverted horn mouth comprises a shrinkage hole (2), a tube section (3) and an expansion hole (4); and raising plates (1) are arranged in front of the shrinkage hole and uniformly distributed in the axial direction of the barrel body. The rotary kiln has the advantages of high production capacity, low energy consumption and stable quality of calcined titanium dioxide.

Description

technical field [0001] The invention relates to titanium dioxide production equipment, in particular to a rotary kiln for calcination of sulfuric acid titanium dioxide, which belongs to the field of titanium dioxide production. Background technique [0002] In the sulfuric acid titanium dioxide production process, calcination is one of the three most critical processes that determine the quality of titanium dioxide. The calcination process of titanium dioxide is roughly as follows: after the hydrolysis product metatitanic acid is separated from solid and liquid to remove most of the water, it is input into a titanium dioxide rotary kiln tail (also called kiln tail) with a certain slope (generally 3-5%) and slowly rotating feed end or high end), while the combustion chamber at the kiln head (i.e. discharge end or low end) blows clean flames and hot air into the kiln to dehydrate, desulfurize and transform the materials. The materials calcined at high temperature come out fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/08
Inventor 柴春旺
Owner GUANGXI JINMAO TITANIUM
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