Non-volatile method for extracting zinc, iron and indium from solution of zinc, iron and indium

[0015] Example one:

[0016] A method for extracting zinc, iron, and indium from zinc, iron and indium solution without volatilization:

[0017] Take 500ml of 1# low-acid leaching supernatant containing zinc, iron, and indium from a hydro-zinc smelter (the solution contains 120g/L zinc, 18.92g/L iron, and 149.09mg/L indium), and the solution at room temperature Warm up to 90℃, gradually add 20g of secondary zinc oxide powder containing about 50% zinc. During the separation of indium and zinc, the pH value of the zinc, iron and indium solution is controlled at 4.5. After stirring and reacting for 2 hours, liquid-solid separation is carried out and the indium precipitate is obtained by filtration. The indium precipitation rate is 97.26% and the zinc in the indium precipitation slag contains 12.6%. The zinc-containing liquid is immersed in the middle or after the purification and impurity removal treatment is sent to the electrowinning zinc; the indium precipitation slag is added to 150ml of water, and the concentration is 98% sulfuric acid solution is dissolved. After PH=1, 10ml sulfuric acid with a concentration of 98% is added to make the sulfuric acid concentration of the solution reach about 20g/L. After filtration, 185ml of indium-rich solution and leaching residue are obtained. The leaching residue is sent to high-acid leaching zinc. The indium liquid is extracted with an extractant prepared by 30% P204 and 70% 200# kerosene. The oil phase is 1:5 compared with water, and the indium extraction rate is 98.97%. The extraction organic phase and raffinate are obtained. Phase transfer, back extraction, displacement, electrolysis to further extract indium, add the raffinate to neutralizer to adjust PH=4.5 to precipitate iron, after iron removal, use lime milk to further adjust PH7.0, the precipitate is zinc slag, and the zinc slag is sent back The zinc system is processed and the mother liquor is returned to the leaching step.

[0018] Embodiment two:

[0019] Take 500ml of 2# low-acid leaching supernatant containing zinc, iron, and indium from a hydro-zinc smelter (the solution contains 117g/L zinc, 14.58g/L iron, and 98.88mg/L indium), and the solution at room temperature Warm up to 95℃, gradually add 18g of zinc hypoxide powder containing about 50% zinc, control the pH value of the zinc-iron-indium solution during the indium-zinc separation process at 4.0, stir and react for 2h, carry out liquid-solid separation, filter to obtain indium precipitate The slag and zinc-containing liquid, in which the precipitation rate of indium is 94.43%, the zinc-containing liquid is immersed in the middle or after the purification and impurity treatment is sent to electrowinning zinc; the indium precipitation slag is dissolved by adding 150ml sulfuric acid with a concentration of 5%, and the concentration is added after PH=1 5ml of 98% sulfuric acid to reach an acid concentration of about 20g/L. After filtration, 185ml of indium-rich liquid and leaching residue are obtained. The leaching residue is sent to high acid to extract zinc. The indium-rich liquid is extracted with 30% P204 and 70% 200# kerosene. Carry out box extraction, the oil phase is 1:5 compared with water, the indium extraction rate is 96.62%, and the extracted organic phase and raffinate are obtained. The extracted organic phase is sent to back extraction, displacement, and electrolysis to further extract indium, and the raffinate is added The neutralizer adjusts PH=4.5 to precipitate iron. After iron removal, the liquid is further adjusted to pH 7.0 with lime milk. The precipitate is zinc slag, which is sent back to the zinc system for treatment, and the mother liquor returns to the leaching step.

[0020] Embodiment three:

[0021] Take 500ml of 3# low-acid leaching supernatant containing zinc, iron, and indium from a hydro-zinc smelter (the solution contains 125g/L zinc, 16.50g/L iron, and 200.4mg/L indium), and put the solution at room temperature Warm up to 25℃, gradually add 18g of zinc suboxide powder containing about 50% zinc. During the separation of indium and zinc, the pH value of the zinc, iron and indium solution is controlled at 4.2. After stirring and reacting for 1.8 hours, liquid-solid separation is carried out, and indium is obtained by filtration. Precipitation slag and zinc-containing liquid, in which the precipitation rate of indium is 98.52%, the zinc-containing liquid is sent to the middle immersion or after purification and impurity removal treatment, and then sent to electroplating zinc; the indium precipitation slag is added to 150ml zinc precipitation mother liquor, with a concentration of 98% sulfuric acid Dissolve in 10ml. After PH=1, add 10ml of sulfuric acid with a concentration of 98% to reach an acid concentration of about 20g/L. After filtration, 183ml of indium-rich solution and leaching residue are obtained. The leaching residue is sent to high acid for leaching zinc. Indium-rich solution uses 30% P204 The extraction agent prepared with 70% 200# kerosene is used for box extraction. The oil phase is 1:5 compared with water, and the indium extraction rate is 98.52%. The extracted organic phase and raffinate are obtained. The extracted organic phase is sent to back extraction, replacement, Indium is further extracted by electrolysis. The raffinate is added to neutralizer to adjust PH=4.5 to precipitate iron. After iron removal, the liquid is further adjusted to pH 7.0 with lime milk. The precipitate is zinc slag. The zinc slag is sent back to the zinc system for treatment, and the mother liquor is returned for leaching step.