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Titanium dioxide production process calcining tail gas processing method

A technology of production process and treatment method, applied in the field of titanium dioxide production, can solve the problems of low waste heat utilization efficiency, no heat recovery, low thermal efficiency utilization, etc., to improve the waste heat exchange rate and utilization rate, save steam consumption, save The effect of water and electricity consumption

Active Publication Date: 2016-05-11
SHANGHAI TITANOS IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that the waste heat utilization efficiency is low, and it is necessary to build a waste acid concentration device, and the pre-concentrated sulfuric acid needs to be kept warm.
The problem with this method is that the factory must be equipped with a set of graphite towers for concentrating sulfuric acid, and it is prone to equipment failure
The problem with this method is that the utilization of thermal efficiency is low, non-electric air conditioning equipment needs to be configured separately, and it is repeated with existing refrigeration equipment, which increases investment
The problem with this method is that there is no heat recovery
The problem with this method is that the heat loss of the hot waste gas is large during the waste acid spraying process, the waste heat utilization efficiency is low, and the harmful and useless gases in the calcination tail gas return to the kiln, which will adversely affect the calcination process.
[0014] To sum up, in the prior art, the waste heat of the calcination tail gas of the titanium dioxide rotary kiln is not utilized or the waste heat utilization efficiency is low, and the sulfide discharged from the calcination tail gas is difficult to control, and the calcination tail gas often fails to meet the standard.

Method used

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Embodiment Construction

[0032] Preferred embodiments are listed below to further illustrate the purpose, features and effects of the present invention.

[0033] The 350-400℃ calcining tail gas discharged from the tail of a sulfuric acid titanium dioxide production rotary kiln with an annual capacity of 60,000 tons is connected to a multi-tube ceramic cyclone through the main flue of the rotary kiln, and then passed into waste heat after the cyclone dust removal In the boiler system, 90% of the titanium dioxide dust in the calcined tail gas is collected in the collector at the lower part of the multi-tube ceramic cyclone, which can be recycled and transferred to the beating tank for beating process.

[0034] The waste heat boiler system includes a tail gas channel and a cooling water channel. The tail gas channel and the cooling water channel respectively flow through a deaerator, a hot water heater with longitudinal fin heat pipes, a heat pipe evaporator and a steam concentrator. After cyclone dust remova...

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PUM

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Abstract

The present invention discloses a titanium dioxide production process calcining tail gas processing method comprising the following steps: 1) dust removal; 2) preliminary heat exchange, to be more specific, calcining tail gas after the dust removal is discharged into a waste heat boiler system for heat exchange with process water, and the calcining tail gas is preliminarily calcined; 3) further heat exchange, to be more specific, the preliminarily-calcined calcining tail gas enters a venturi system and further cooled by spraying with spent sulfuric acid; and 4) desulfurization. According to the titanium dioxide production process calcining tail gas processing method, waste heat boiler system with high heat recovery utilization rate is used, and by step-by-step heat exchange, heat can be efficiently recovered from the calcining tail gas, and can be used for other processes in a titanium dioxide production line, energy and water consumption can be greatly saved, and by the desulfurization, desulfurization rate of the calcining tail gas is significantly increased.

Description

Technical field [0001] The invention belongs to the field of titanium dioxide production, and specifically relates to a method for treating calcined tail gas in the titanium dioxide production process. Background technique [0002] Titanium Dioxide (TiO 2 ) Is the most important white pigment widely used at present. It is widely used in coatings, papermaking, ink and other fields, and its demand is proportional to GDP. At present, the global annual production capacity of titanium dioxide is more than 5 million tons, and the domestic annual production capacity of titanium dioxide is more than 2 million tons, and the price is about 15,000-22,000 yuan / ton. In terms of production methods, in China, except for Jinzhou Titanium Dioxide Plant which adopts the chlorination method, the rest are all produced by the sulfuric acid method. One of the more prominent problems in the current sulfuric acid titanium dioxide production process is environmental protection and energy saving. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D50/00B01D45/12B01D53/78B01D53/50C01G23/08F27D17/00
CPCB01D50/00B01D53/502B01D53/78F27D17/004C01G23/08B01D2251/404B01D2258/02B01D2259/124B01D2257/302F27D2017/006B01D50/40Y02P20/129Y02P10/25Y02P20/10
Inventor 杨涛宁科成金政元周仲华王晶晶
Owner SHANGHAI TITANOS IND
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