Method for recovering gallium, indium and germanium from waste thin film solar cells
A technology for solar cells and thin films, applied in the field of recycling gallium, indium, and germanium, can solve the problems of inhibiting the recycling of waste thin-film solar cells, complex processes, low efficiency, etc., and achieve the effects of reducing recycling costs, simple processes, and improving recycling efficiency.
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Embodiment 1
[0053] A method for recovering gallium, indium, and germanium from waste thin-film solar cells, the specific steps are as follows:
[0054] Step S11. Obtain a first separation liquid containing metal ions of gallium, indium, germanium, cadmium, copper, tin, and zinc:
[0055] Add the pulverized waste thin-film solar cell powder with a particle size of 0.5 to 1 mm into a mixed solution of sulfuric acid and nitric acid containing an oxidant. The mixture is stirred at a speed of 100r / min and reacted at 80°C for 6 hours. The first separation liquid of metal ions of, indium, germanium, cadmium, copper, tin, and zinc; wherein the hydrogen ion concentration in the mixed solution of sulfuric acid and nitric acid is 1mol / L, and the ratio of moles of sulfuric acid to nitric acid is 1:0.4, The solid-to-liquid ratio of the mixed solution of waste thin film solar cell powder and sulfuric acid and nitric acid is 1g: 2ml; the oxidant is sodium chlorate, whose mass is 0.08 times the mass of thin f...
Embodiment 2
[0069] A method for recovering gallium, indium, and germanium from waste thin-film solar cells, the specific steps are as follows:
[0070] Step S21. Obtain a first separation liquid containing metal ions of gallium, indium, germanium, cadmium, copper, tin, and zinc:
[0071] Refer to step S11 in Example 1 for this step. The difference is: the stirring speed is 60r / min, the reaction temperature is 60°C, and the reaction time is 10 hours; the hydrogen ion concentration in the mixed solution of sulfuric acid and nitric acid is 0.7 mol / L, the ratio of moles of sulfuric acid to nitric acid is 1:0.3, the solid-to-liquid ratio of waste thin film solar cell powder and the mixed solution of sulfuric acid and nitric acid is 1g:1ml; the oxidant is hydrogen peroxide, and its mass is the mass of thin film solar cell powder 0.1 times of
[0072] Step S22. Obtain the second separation liquid:
[0073] Refer to step S12 in Example 1 for this step. The difference is that the pH value of the first s...
Embodiment 3
[0086] A method for recovering gallium, indium, and germanium from waste thin-film solar cells, the specific steps are as follows:
[0087] Step S31. Obtain a first separation liquid containing gallium, indium, germanium, cadmium, copper, tin, and zinc metal ions:
[0088] Refer to step S11 in Example 1 for this step. The difference is: the stirring speed is 200r / min, the reaction temperature is 99°C, and the reaction time is 3 hours; the hydrogen ion concentration in the mixed solution of sulfuric acid and nitric acid is 0.5 mol / L, the ratio of moles of sulfuric acid to nitric acid is 1:0.6, the solid-to-liquid ratio of waste thin film solar cell powder and the mixed solution of sulfuric acid and nitric acid is 1g: 3ml; the oxidant is potassium permanganate, and its quality is thin-film solar cell 0.1 times the mass of powder;
[0089] Step S32. Obtain the second separation liquid:
[0090] Refer to step S12 in Example 1 for this step. The difference is that the pH of the first sep...
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