A method for recovering exposed (001) crystal plane tio2 from titanium-containing waste liquid
A technology for titanium waste liquid and crystal face, which is applied in the field of recovering exposed crystal face TiO2, can solve problems such as environmental pollution and resource waste, and achieve the effects of low cost, simple process method, easy operation and large-scale realization.
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Embodiment 1
[0030] Simulate the pickling titanium waste liquid of a titanium production company, the waste liquid contains Ti 4+ and unreacted HF and HNO 3 : H according to the volume ratio 2 O:HNO 3 (mass fraction is 60%, analytically pure, Quzhou Juhua Reagent Co., Ltd.): HF (mass fraction is 40%, analytically pure, Zhejiang Zhongxing Chemical Reagent Co., Ltd.) = 5:4:1 configuration corrosion solution; 50 × Immerse a 50×1mm titanium sheet in 10ml of corrosive solution for 10-15s to remove oxides on the surface of the titanium sheet; take out the titanium sheet, collect the waste liquid, and obtain the titanium-containing waste liquid required for the test, and measure the Ti in the waste liquid 4+ The concentration is 8g / L, F - The concentration is 45.6g / L, NO 3 - The concentration is 364g / L.
[0031] Collect the titanium-containing waste liquid produced by the mixed acid etching of hydrofluoric acid and nitric acid to treat the metal titanium sheet, and dilute the collected wast...
Embodiment 2
[0033] Collect the titanium-containing waste liquid that the mixed acid acid etching of hydrofluoric acid and nitric acid produces in the embodiment 1, and the waste liquid that collects is diluted with water, until the Ti that contains in the waste liquid 4+ The concentration is 0.55g / L, F - The concentration is 3.0g / L, NO 3 - The concentration was 24g / L; then the diluted titanium-containing waste liquid was transferred to a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at 190°C for 24 hours; the reaction was completed, centrifuged, and the separated precipitates were separated by water and ethanol respectively. After washing three times, the product was dried in a drying oven at 80°C for 12 hours; the dried product was calcined in a muffle furnace at 500°C for 2 hours to remove residual fluoride, and the exposed (001) crystal plane was obtained TiO 2 , and the recovery rate was 65%.
Embodiment 3
[0035] Collect the titanium-containing waste liquid that the mixed acid acid etching of hydrofluoric acid and nitric acid produces in the embodiment 1, and the waste liquid that collects is diluted with water, until the Ti that contains in the waste liquid 4+ The concentration is 0.47g / L, F - The concentration is 2.7g / L, NO 3 - The concentration was 21.6 g / L; then the diluted titanium-containing waste liquid was transferred to a polytetrafluoroethylene hydrothermal reaction kettle for a hydrothermal reaction at 200°C for 36 hours; the reaction was completed, centrifuged, and the separated precipitate was separated with water and ethanol Each was washed three times, and then the product was dried in a drying oven at 80°C for 12 hours; the dried product was calcined in a muffle furnace at 500°C for 2 hours to remove residual fluoride, and the exposed (001) crystal was obtained. Surface TiO 2 , the recovery rate was 70%.
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