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

Inactive Publication Date: 2009-09-09
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the salt content of the wastewater exceeds the water quality of the concentrated water from seawater desalination, it is difficult for electrodialysis, membrane separation and reverse osmosis devices to operate stably, and the general evaporation and concentration method consumes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a method for treating wastewater, in particular to a method for treating hydrometallurgical process wastewater, and pertains to the field of energy saving, emission reducing and environmental protection. The method utilizes solar energy or boiler residual heat to preheat high-density hydrometallurgical process wastewater; then the wastewater is sent to a multi-effect evaporator for at least trifle-effect vacuum continuous evaporation and flash crystallization under 0.01MPa to 0.09 MPa vacuum degree; part of the steam after the previous evaporation sequentially enters into the next evaporator and is utilized as the heat source; the condensed hot condensate of evaporators at all levels is recycled. The invention solves the problem that the high-density hydrometallurgical process wastewater is difficult to treat. The invention also has low energy consumption and the complex salt products after evaporation and crystallization can be reutilized.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a treatment method for high-concentration hydrometallurgical process wastewater, and belongs to the fields of energy saving, emission reduction and environmental protection. Background technique [0002] In the traditional hydrometallurgical process, some impurity elements will circulate and accumulate in the solution. In order to ensure the smooth progress of the hydrometallurgical process, when the impurity elements accumulate for a certain period of time, it is necessary to open a part of the solution to discharge the impurity elements. Calcium oxide, calcium hydroxide, calcium carbonate, sodium hydroxide, sodium carbonate, and sodium sulfide are usually used to neutralize and precipitate, so that the main metal elements are precipitated into the slag and then recycled, while the impurity elements are left in the solution and are released with the solution. Open the way. This ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/04C02F1/06C02F1/14C02F1/16C02F103/16
CPCY02A20/212
Inventor 何艳明马启坤许树克简胜郭新梅王灏
Owner KUNMING METALLURGY INST
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