Method for concentrating titanium white waste acids through gas-liquid contact technology

Abstract

The invention relates to a method for concentrating titanium white waste acids through a gas-liquid contact technology. The method concretely comprises the following steps: the white waste acids are pressed in a titanium white waste acid tank into a gas-liquid contact evaporator, the titanium white waste acids are jetted through nozzles to form mist, high temperature hot wind is sent to a gas-liquid contact evaporator through a blower, directly upwardly contact titanium white waste acid droplets jetted by the nozzles and is rapidly cooled, and water in the waste acids is massively evaporated to concentrate diluted waste acids; a gas and liquid mixture at the upper portion of the gas-liquid contact evaporator enters a gas-liquid separator and undergoes rotation and separation, the obtained gas is discharged through the discharge port of the gas-liquid separator, and condensed water is recovered; the concentrated waste acids at the lower portion of the gas-liquid contact evaporator are sent to a vacuum flash evaporation tank, and are concentrated and cooled; and the flash-evaporated steam enters a vacuum condensation jet pump, and the concentrated waste acids are sent to a storage tank, and are stored to be treated. The method effectively solves the titanium white waste acid recycling problem, and has the advantages of low energy consumption, simplicity, effectiveness, stable operation, and substantial economy and environment benefits.

Description

technical field [0001] The invention relates to a method for concentrating titanium white waste acid by a gas-liquid contact method. Background technique [0002] Since the production of titanium dioxide by sulfuric acid method, the most difficult problem in environmental protection is the effective reuse of waste acid, because waste acid with an acid concentration of about 20% accounts for 70% of the treated waste. Calculated according to the F value of 1.9 in the production hydrolyzate, that is, 1 ton of titanium dioxide corresponds to 1.9 tons of sulfuric acid, about 70% of which enters the hydrolysis filtrate, that is, 100% of 1.33 tons of sulfuric acid, and the ferrous sulfate brought by the ratio of iron to titanium , the total adds up to nearly 1.7 tons of sulfate radicals, and the remaining 30% enters the dilute waste acid with washing water. Concentration and impurity removal treatment of waste acid for reuse or reuse has always been a serious problem that lingers ...

AI Technical Summary

Problems solved by technology

However, there are insurmountable problems in concentrating waste titanium dioxide acid by multi-effect evaporation and concentration: (1) high energy consumption; (2) easy blockage of evaporation pipes and unstable operation; (3) high requirements for equipment materials and large investment; (4) ) is complicated to operate and difficult to maintain

[0005] However, the above-mentioned literature still fails to find a method for concentrating titanium dioxide waste acid with low energy consumption, simple treatment method, and suitable for small and medium-sized sulfuric acid titanium dioxide enterprises.

Images