A method for extracting alkali metal from lepidolite
A technology of lepidolite and alkali metal, which is applied in the field of comprehensive extraction of alkali metal in lepidolite, can solve the problems of high energy consumption, large material flow, large amount of waste residue, etc., and achieves reduction of environmental pollution, low grade requirements, and reduction of alkali metal. effect of loss
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0037] 1) Lepidolite leaching with hydrochloric acid
[0038] In a 500L enamel reactor, add 250-300 mesh 100 kg lepidolite and 250 kg industrial hydrochloric acid (31% to 33%), stir at 100°C for 2 hours, cool and filter to obtain a concentrated hydrochloric acid extract of lepidolite.
[0039] 2) Remove Al from the extract
[0040] Keep the temperature in the spray tower stable at 380℃, AlCl 3 Convert to Al 2 O 3 . The solid product is collected, and the HCl tail gas is absorbed and returned to the hydrochloric acid leaching reactor. The solid product is dissolved in 200 kg of water and filtered to remove the insoluble Al 2 O 3 Solid, get a chloride salt solution.
[0041] 3) Al, Mg, Fe precipitation separation
[0042] Put the chloride salt solution 1 into the sedimentation tank, add NaOH, adjust pH=8-9, brown precipitate appears in the solution, stand still, press filter to remove Al, Mg, Fe impurities, the obtained filtrate continues to add NaOH, adjust pH=9 ~13, when the magnesiu...
Embodiment 2
[0052] 1) The lepidolite is ball milled and passed through a 250-mesh sieve, and then dried with a flash evaporator;
[0053] 2) Dissolving and leaching the obtained lepidolite with hydrochloric acid, the concentration of hydrochloric acid is 23%, the amount of hydrochloric acid is twice the mass of lepidolite, the reaction temperature is 65°C, and the reaction time is 4 hours;
[0054] 3) After filtering the slurry obtained by the reaction, the silica is separated to obtain an acid leachate;
[0055] 4) The acid leaching solution is sent to the spray tower for spray drying and roasting at 350°C. After the hydrochloric acid vapor in the spray tower is absorbed by the concentration tower, it is sent to the reactor with a plunger pump for recycling, and re-participates in the reaction and concentrates. The tower tail gas is passed through the absorption tower to absorb the residual hydrochloric acid, and then is discharged after being absorbed by alkali; the collected powder is dried b...
Embodiment 3
[0060] 1) Ball mill the lepidolite, pass all 270 mesh sieve, and then dry it with a flash evaporator;
[0061] 2) Dissolving and leaching the lepidolite with hydrochloric acid, the concentration of hydrochloric acid is 26%, the amount of hydrochloric acid is 2.5 times the mass of lepidolite, the reaction temperature is 75°C, and the reaction time is 3.5 hours;
[0062] 3) After filtering the slurry obtained by the reaction, the silica is separated to obtain an acid leachate;
[0063] 4) The acid leaching solution is sent to the spray tower for spray drying and roasting at 360°C. After the hydrochloric acid vapor in the spray tower is absorbed by the concentration tower, it is sent to the reactor by a plunger pump for recycling, and then participates in the reaction again and concentrates. The tower tail gas is passed through the absorption tower to absorb the residual hydrochloric acid, and then is discharged after being absorbed by alkali; the collected powder is dried by a flash ev...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More