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

A technology of gas-liquid contact and titanium dioxide waste acid, applied in chemical instruments and methods, sulfur trioxide/sulfuric acid, inorganic chemistry, etc., can solve the problems of easy blockage of evaporation pipelines, high requirements for equipment materials, and simple treatment methods, and achieve The effect of low equipment material requirements, significant environmental benefits, and reliable process

CN105858621AInactive Publication Date: 2016-08-17钮德明
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-08-17
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

Examples

Embodiment 1

[0020] Use the corrosion-resistant dilute acid pump 2 to press the 100°C titanium dioxide waste acid in the titanium dioxide waste acid tank 1 into the gas-liquid contact evaporator 5, spray the titanium dioxide waste acid into a mist through the nozzle, and at the same time, the blower 3 blows the high-temperature hot blast furnace The high-temperature hot air generated in 4 is sent to the gas-liquid contact evaporator 5, and directly contacts with the titanium dioxide waste acid droplets sprayed by multiple nozzles from bottom to top. Due to the large contact area, long contact time and sufficient heat exchange, the gas can be quickly Cooling, while the water in the titanium white waste acid is evaporated in large quantities, and the dilute waste acid with an acid concentration of 20% is concentrated to more than 45%; the gas-liquid mixture in the upper part of the gas-liquid contact evaporator 5 enters the gas-liquid separator 6, The gas-liquid mixture rotates at a high spee...

Embodiment 2

[0022] Use the corrosion-resistant dilute acid pump 2 to press the 100°C titanium dioxide waste acid in the titanium dioxide waste acid tank 1 into the gas-liquid contact evaporator 5, spray the titanium dioxide waste acid into a mist through the nozzle, and at the same time, the blower 3 blows the high-temperature hot blast furnace The high-temperature hot air generated in 4 is sent to the gas-liquid contact evaporator 5, and directly contacts with the titanium dioxide waste acid droplets sprayed by multiple nozzles from bottom to top. Due to the large contact area, long contact time and sufficient heat exchange, the gas can be quickly Cooling, while the water in the titanium white waste acid is evaporated in large quantities, and the dilute waste acid with an acid concentration of 30% is concentrated to more than 60%; the gas-liquid mixture in the upper part of the gas-liquid contact evaporator 5 enters the gas-liquid separator 6, The gas-liquid mixture rotates at a high spee...