Aluminum removal method for shale vanadium extraction pickle liquor
A vanadic acid and shale technology, applied in the field of aluminum removal for shale extraction of vanadic acid leaching solution, can solve the problems of long reaction time and long process flow, and achieve the effects of short reaction time, short process flow and shortened process flow
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Embodiment 1
[0023] A method for removing aluminum from vanadic acid leaching solution for extracting shale. The concrete steps of the method described in this embodiment are:
[0024] Step 1. Add potassium salt to the vanadic acid leaching solution for extracting shale, and mix to obtain a pretreatment solution. The molar ratio of Al:K in the pretreatment solution is 1: (0.8-1.5).
[0025] Step 2, placing the pretreatment solution in a closed container, and stirring for 4.5-6 hours at a temperature of 140-180° C. and a rotation speed of 100-200 r / min to obtain a mixed slurry.
[0026] Step 3: Separating the mixed slurry from solid to liquid to obtain aluminium-removing purification solution and alum slag.
[0027] The vanadic acid leaching solution for extracting shale: the aluminum concentration is 4-15 g / L; the pH value is -0.50-1.0.
[0028] In this embodiment: the removal rate of Al is 80-86%; the loss rate of vanadium is 1.2-2%.
Embodiment 2
[0030] A method for removing aluminum from vanadic acid leaching solution for extracting shale. The concrete steps of the method described in this embodiment are:
[0031] Step 1. Add potassium salt to the vanadic acid leaching solution for extracting shale, and mix to obtain a pretreatment solution. The molar ratio of Al:K in the pretreatment solution is 1: (1.5-2.2).
[0032] Step 2, placing the pretreatment solution in a closed container, and stirring for 4-5 hours under the conditions of a temperature of 160-220° C. and a rotation speed of 200-300 r / min, to obtain a mixed slurry.
[0033] Step 3: Separating the mixed slurry from solid to liquid to obtain aluminium-removing purification solution and alum slag.
[0034] The vanadic acid leaching solution for extracting shale: the aluminum concentration is 10-20 g / L; the pH value is 0.5-1.5.
[0035] In this embodiment: the removal rate of Al is 83-88%; the loss rate of vanadium is 0.8-1.5%.
Embodiment 3
[0037] A method for removing aluminum from vanadic acid leaching solution for extracting shale. The concrete steps of the method described in this embodiment are:
[0038] Step 1: Add potassium salt to the vanadic acid leaching solution for shale extraction, and mix to obtain a pretreatment solution, wherein the molar ratio of Al:K in the pretreatment solution is 1: (2.2-3.0).
[0039] Step 2, placing the pretreatment liquid in a closed container, stirring for 3.5-4.5 hours at a temperature of 200-280° C. and a rotation speed of 300-400 r / min to obtain a mixed slurry.
[0040] Step 3: Separating the mixed slurry from solid to liquid to obtain aluminium-removing purification solution and alum slag.
[0041] The vanadic acid leaching solution for extracting shale: the aluminum concentration is 15-25 g / L; the pH value is 1.0-2.0.
[0042] In this embodiment: the removal rate of Al is 85-90%; the loss rate of vanadium is 0-1.2%.
[0043] This embodiment has the following positi...
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