Method for utilizing fluorine-containing acid waste water for producing fluotitanic acid

Abstract

The invention provides a method for utilizing fluorine-containing acid waste water for producing fluotitanic acid. The fluorine-containing waste water is used as a raw material, reacts with metatitanic acid or titanic iron ore, and is extracted and separated through solvent to prepare fluotitanic acid. The method comprises the specific steps that 1, fluorine and titanium are metered according to the molar ratio of (4-8):1, after the fluorine-containing acid waste water and metatitanic acid or titanic iron ore are mixed uniformly, the mixture is subjected to a stirring reaction for 20-400 min under the conditions with the temperature being minus 10 DEG C-120 DEG C and pressure being 1-10 atm to obtain a titanic acid solution; in the fluorine-containing acid waste water, mass concentration of fluorine is 8-50%; 2, calculation is carried out according to the size ratio of (0.5-5):1, oxygen-containing organic solvent is added into the titanic acid solution in the step 1, after being stirred and extracted, the mixture stands and is layered, and oxygen-containing organic extract liquor containing fluoride titanic acid and a water solution are separated, washed and purified to obtain a fluotitanic acid product. The waste water treatment technology process is simple, production efficiency is high, cost is low, purity of the product is high, environment is protected while the fluorine-containing waste water is utilized in a resource mode, and the method has good economic and environmental benefits.

Description

technical field [0001] The invention relates to a method for preparing fluorotitanic acid by utilizing fluorine-containing acidic wastewater, and specifically belongs to the technical field of environmental protection chemical industry. technical background [0002] Fluotitanic acid, colorless liquid, molecular formula H 2 TiF 6 , molecular weight 164. Fluotitanic acid is an important raw material for the preparation of fluorotitanate, often used as a diazonium salt stabilizer, a catalyst for alkylation and polymerization, and also used as a catalyst, metal surfactant, metal surface oxide, silicate film It is widely used as a cleaning and corrosive agent, cleaning agent before electroplating of aluminum and alloys, and as a conductive liquid in lead-tin electroplating, etc., making it an extremely important chemical raw material. [0003] The traditional preparation process of fluorotitanic acid is to directly dissolve titanium dioxide (natural or synthetic rutile) in ele...

AI Technical Summary

Problems solved by technology

Other methods also include electrodialysis membrane and diffusion dialysis membrane to recover fluorine, but due to the influence of coexisting impurities, the performance of using membrane to separate impurities is very poor, and high concentration of free acid will cause membrane degradation, so it is not practical; Although distillation of fluorine-containing waste liquid is an effective recovery method, it requires the use of corrosion-resistant materials. Not only is the equipment expensive, but distillation separation is often insufficient, so it is difficult to apply in terms of equipment operating costs.

From the perspective of existing technologies, it can be said that the technology to effectively recover fluorine in wastewater has not yet been established.