Low-energy treatment method of high-density hydrometallurgical process wastewater
A technology of hydrometallurgy and treatment method, which is applied in the fields of energy saving, emission reduction and environmental protection. It can solve the problems that restrict the survival and development of hydrometallurgy enterprises, make it difficult to operate stably, and make it difficult for enterprises to bear. It achieves fast evaporation and is not easy to scale. , The effect of low evaporation energy consumption
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Embodiment 1
[0012] Take 10m of high-concentration hydrometallurgical process wastewater containing 60g / l of various metal salts such as sodium sulfate, sodium chloride, sodium fluoride, and copper sulfate, lead sulfate, and cobalt sulfate. 3 , The initial pH value of the wastewater is 6-8, and the traditional hydrometallurgical process device is used for evaporation and concentration. The distilled water cannot be recycled, and the evaporation needs to consume 30t of steam (0.04-0.06MPa steam). However, using solar energy and boiler waste heat preheating, multi-effect vacuum continuous evaporation, and multi-effect flash crystallization described in the present invention, in addition to solar energy and boiler waste heat, evaporation consumes less than 4 tons of steam, compared with traditional hydrometallurgical evaporation concentration devices. Save more than 86% of energy. About 8t of distilled water can be recycled, and 0.6t of sodium sulfate double salt products obtained after evapo...
Embodiment 2
[0014] Take high-concentration hydrometallurgical process wastewater containing 80g / l of salts such as sodium sulfate, sodium chloride, sodium fluoride, sulfuric acid (or chloride) cobalt, nickel, magnesium, manganese, copper, lead, zinc, cadmium, chromium, etc. 20m 3 , the initial pH value of waste water is 6-8, using solar energy and boiler waste heat preheating, multi-effect vacuum continuous evaporation, multi-effect flash crystallization according to the present invention, except for solar energy and boiler waste heat, evaporation consumes less than 8 tons of steam, and evaporation crystallization Afterwards, 1.6t of sodium sulfate double salt products can be obtained for export or comprehensive utilization, and about 16t of distilled water can be obtained for recycling.
Embodiment 3
[0016] Take 30m of high-concentration hydrometallurgical process wastewater containing 120g / l of various metal salts such as sodium sulfate, sodium chloride, sodium fluoride, copper sulfate, lead sulfate, and cobalt sulfate 3 , The initial pH value of the wastewater is 6-8, and the traditional hydrometallurgical process device is used for evaporation and concentration. The distilled water cannot be recycled, and the evaporation needs to consume 90t of steam (0.04-0.06MPa steam). However, using solar energy and boiler waste heat preheating, multi-effect vacuum continuous evaporation, and multi-effect separation flash crystallization described in the present invention, in addition to solar energy and boiler waste heat, evaporation consumes less than 12 tons of steam, compared with traditional hydrometallurgical evaporation and concentration. The device saves energy by 86%. About 24t of distilled water can be recycled. After evaporation and crystallization, 3.6t of sodium sulfate...
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