Technology for zinc wet-process clean smelting and resource comprehensive recycling
A wet and clean technology, which is applied in the direction of photographic process, photographic auxiliary process, process efficiency improvement, etc., can solve the problems of reducing investment in zinc hydrometallurgy, shortening process flow of zinc hydrometallurgy, etc., to reduce coke consumption, The effect of reducing emissions
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Embodiment 1
[0028] A zinc wet method clean smelting and resource comprehensive recycling process, the process includes the following steps:
[0029] Step 1) Roast the zinc concentrate, produce sulfur dioxide flue gas and zinc calcine after roasting, introduce the sulfur dioxide flue gas into the double-rotation and double-absorption sulfuric acid system, and recover the sulfur in the concentrate in the form of concentrated sulfuric acid;
[0030] Step 2), after leaching the zinc calcined sand produced in step 1) through neutral solution and low-acid solution, the electrolytic waste liquid (containing H 2 SO 4 The mass concentration is 160g / L, the mass concentration of zinc is 35g / L) and sulfuric acid for enhanced leaching, that is, by raising the temperature during the leaching process to 85°C, the initial acidity of the reaction is controlled at 150 g / L, and the acidity at the end of the reaction is controlled at 130g / L, the working time is controlled within 3 hours, the liquid-solid ra...
Embodiment 2
[0035] A zinc wet method clean smelting and resource comprehensive recycling process, the process includes the following steps:
[0036] Step 1) Roast the zinc concentrate, produce sulfur dioxide flue gas and zinc calcine after roasting, introduce the sulfur dioxide flue gas into the double-rotation and double-absorption sulfuric acid system, and recover the sulfur in the concentrate in the form of concentrated sulfuric acid;
[0037] Step 2), after leaching the zinc calcined sand produced in step 1) through neutral solution and low-acid solution, the electrolytic waste liquid (containing H 2 SO 4The mass concentration is 180g / L, the mass concentration of zinc is 50g / L) and sulfuric acid for enhanced leaching, that is, by raising the temperature during the leaching process to 90°C, the initial acidity of the reaction is controlled at 200g / L, and the acidity at the end of the reaction is controlled at 160g / L, the working time is controlled at 5 hours, the liquid-solid ratio, ...
Embodiment 3
[0042] A zinc wet method clean smelting and resource comprehensive recycling process, the process includes the following steps:
[0043] Step 1) Roast the zinc concentrate, produce sulfur dioxide flue gas and zinc calcine after roasting, introduce the sulfur dioxide flue gas into the double-rotation and double-absorption sulfuric acid system, and recover the sulfur in the concentrate in the form of concentrated sulfuric acid;
[0044] Step 2), after leaching the zinc calcined sand produced in step 1) through neutral solution and low-acid solution, the electrolytic waste liquid (containing H 2 SO 4 The mass concentration is 195g / L, and the mass concentration of zinc is 70g / L) and sulfuric acid for enhanced leaching, that is, by raising the temperature during the leaching process to 98°C, the initial acidity of the reaction is controlled at 250 g / L, and the acidity at the end of the reaction is controlled at 190 g / L, the working time is controlled within 3 hours, the liquid-sol...
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