Titanium dioxide acidolysis tail gas treatment method

Abstract

The invention belongs to the technical field of environmental protection, and particularly provides a titanium dioxide acidolysis tail gas treatment method. The titanium dioxide acidolysis tail gas treatment method comprises the following steps of: absorbing and cooling high temperature acidolysis tail gas generated by a titanium dioxide process adopting a sulfuric acid method through a washing tower, and processing the tail gas, the volume of which is reduced, through a venturi, so as to realize the tail gas treatment discharge standard, and realize clean production. According to the invention, a Ph value of a liquid in a circulating pool is kept more than or equal to 4.5, and the temperature of the tail gas is ensured to drop to be below 90 DEG C when a main reaction is generated; the tail gas which is greatly reduced in volume after cooling is processed through the venturi, the venturi adopts alkali waste generated by the titanium dioxide process adopting a sulfuric acid method, so as to realize the tail gas treatment discharge standard and realize the clean production; and most of sulfuric acid mist and sulfur dioxide gas of the tail gas are absorbed in the washing tower because of washing of a great quantity of circulating liquid, and the consumption of thin alkali in a follow-up venturi scrubber is less.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to a method for treating tail gas from acidolysis of titanium dioxide. Background technique [0002] There are two titanium dioxide production processes: sulfuric acid method and chlorination method. Although the chlorination method is unanimously considered by industry insiders to be the mainstream of titanium dioxide technology development, the sulfuric acid method is the main method in my country at this stage. This is the objective reality faced by the industry. , sulfuric acid titanium dioxide occupies a large market share due to low cost, easy technology to master, and many product types, and energy saving and emission reduction has always been one of the most difficult problems to solve in the sulfuric acid titanium dioxide process. Among them, flue gas treatment, waste heat utilization, Comprehensive utilization of waste acid is the key. [0003] The acid hyd...

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Problems solved by technology

[0004] Prototitanium dioxide acidolysis tail gas treatment method, such as figure 1 As shown, the acidolysis tail gas is directly discharged into the air after being washed by the washing tower. When the main reaction occurs, the flue gas cannot be cooled instantly, and the flue gas is emptied with a large number of sulfuric acid droplets, causing environmental pollution around the chimney; due to natural exhaust , when the main reaction is reversed, because the flue gas is too late to be discharged, part of the flue gas is discharged indoors, polluting the operating environment and affecting the health of employees

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