Method for recycling vanadium tungsten titanium through secondary oxidation separation with metal oxalic acid solution
A technology of oxalic acid solution and secondary oxidation, which is applied in the fields of non-ferrous metal metallurgy and resource recovery and utilization, can solve the problems of low product purity, difficult control of impurity ions, unusable waste acid solution, etc., and achieves the effect of high-efficiency precipitation
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Embodiment 1
[0093] This embodiment provides a method for the secondary oxidation of metal oxalic acid solution to separate and recover vanadium, tungsten and titanium. The method is as follows: figure 1 Shown:
[0094] (1) After the metal oxalic acid solution is heated to 90°C, oxygen is added for primary oxidation for 240 minutes. The oxalate complex of tungsten and the oxalate complex of titanium are oxidized and decomposed to form metatungstic acid precipitate and titanium dioxide. The molar ratio of oxygen to oxalic acid is 0.9, The flow rate of oxygen is 0.5mL / min;
[0095] Add 5mL of ammonium chloride additive to the solution after primary oxidation, and filter for 300 minutes to obtain primary oxidation solution and tungsten-rich slag. The precipitation rates of W and Ti elements are 95% and 97%, respectively, and the rest of the elements precipitate Rates are all lower than 5%;
[0096] Use 2.5mol / L NaOH solution to dissolve tungsten-rich slag to obtain 20g / L sodium tungstate so...
Embodiment 2
[0105] This embodiment provides a method for secondary oxidation of metal oxalic acid solution to separate and recover vanadium, tungsten and titanium. The method is as follows: figure 1 Shown:
[0106] (1) After the metal oxalic acid solution is heated to 80°C, hydrogen peroxide is added for primary oxidation for 300 minutes. The oxalate complex of tungsten and the oxalate complex of titanium are oxidized and decomposed to form metatungstic acid precipitation and titanium dioxide. The molar ratio of hydrogen peroxide and oxalic acid is 0.75. The flow rate of hydrogen peroxide is 1.0mL / min;
[0107] Add 1 mL of urea additive to the solution after primary oxidation, and filter for 360 minutes to obtain primary oxidation solution and tungsten-rich slag. The precipitation rates of W element and Ti element are 90% and 95%, respectively, and the precipitation rates of other elements are uniform. less than 5%;
[0108] Use 1mol / L NaOH solution to dissolve tungsten-rich slag to obt...
Embodiment 3
[0113] This embodiment provides a method for the secondary oxidation of metal oxalic acid solution to separate and recover vanadium, tungsten and titanium. The method is as follows: figure 1 Shown:
[0114] (1) After the metal oxalic acid solution is heated to 120°C, ozone is added for primary oxidation for 180 minutes. The oxalate complex of tungsten and the oxalate complex of titanium are oxidized and decomposed to form metatungstic acid precipitation and titanium dioxide. The molar ratio of ozone to oxalic acid is 1.1, The flow rate of ozone is 0.1mL / min;
[0115] Add 5mL of Sinclair additive to the solution after primary oxidation, and filter for 240min to obtain the primary oxidation solution and tungsten-rich slag. The precipitation rates of W element and Ti element are 90% and 95%, respectively, and the precipitation rates of other elements are uniform. less than 5%;
[0116] Use 5mol / L NaOH solution to dissolve tungsten-rich slag to obtain 60g / L sodium tungstate solu...
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