Novel desulfurization method for calcination tail gas

Abstract

The invention discloses a novel desulfurization method for calcination tail gas, belonging to the technical field of treatment of tail gas produced during titanium dioxide calcination. The novel desulfurization method comprises the following steps: (1) allowing tail gas at the tail of a calcination kiln to enter a spray tower, spraying the tail gas with waste sulfuric acid, directly pumping the waste sulfuric acid which is at the bottom of the tower after spraying to the top of the tower for recycling, and concentrating the waste sulfuric acid; (2) carrying out further spraying operation on the tail gas by using sand filter water, and washing away acid mist carried in the tail gas; and (3) building an alkali liquor cooling tower, subjecting liquid alkali cooled by the alkali liquor cooling tower to circular spraying, reducing the temperature of the tail gas, absorbing SO2 in the tail gas, reducing the temperature of the tail gas to 35 DEG C or below, and discharging the tail gas when the content of SO2 reaches the standard. Due to the adoption of tail gas desulfurization technology, the national policy of energy conservation and emission reduction in China is accorded with, and the survival of enterprises is guaranteed; and SO2 in calcination tail gas is annually saved about 540 t/year, so the surrounding living environment is greatly protected.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment of titanium dioxide calcination production, and in particular relates to a novel calcination tail gas desulfurization method. Background technique [0002] With the development of the economy and the ever-changing living environment, people pay more and more attention to environmental protection, and the country pays more and more attention to environmental protection. In the chemical industry, SO in the exhaust gas produced by chemical production 2 It is the focus of the country's attention, but the treatment effect of the traditional tail gas desulfurization device is not ideal. [0003] In 2019, the annual production capacity of Lomon Group's titanium dioxide reached 1.01 million tons, and the calcination process is a necessary process for the sulfuric acid method titanium dioxide production process. During the calcination process, the calcination tail gas contains pollutants such as...

AI Technical Summary

Problems solved by technology

[0002] With the development of the economy and the ever-changing living environment, people pay more and more attention to environmental protection, and the country pays more and more attention to environmental protection. In the chemical industry, SO in the exhaust gas produced by chemical production 2 It is the focus of national attention, and the treatment effect of traditional tail gas desulfurization devices is not ideal

[0003] In 2019, the annual production capacity of Lomon Group's titanium dioxide will reach 1.01 million tons, and the calcination process is a necessary process for the sulfuric acid method titanium dioxide production process. During the calcination process, the calcination tail gas contains pollutants such as sulfur dioxide, nitrogen oxides, and dust. Therefore, the direct discharge of exhaust gas does not meet the national emission standards, and will pollute the environment.

[0011] 3. The temperature of the sand filter water is not higher than 35°C, and the secondary spraying has no effect on SO 2 The absorption of SO is also relatively limited, so the SO in the tail gas 2 The residual amount is relatively large, and a large amount of sodium chlorite solution with an accelerator needs to be added for absorption. The absorption cost is high, and the absorbed waste liquid has complex components, which is difficult to realize recycling and reuse.