Method for treating high-salinity wastewater of nickel electrolysis by utilizing flash steam
A technology of high-salt wastewater and flash steam, which is applied in the direction of filtration treatment, sedimentation treatment, multi-stage water treatment, etc., can solve the problems of many steps, large-scale waste water de-weighting treatment, low operating temperature, etc., and achieve low operating temperature and reduce The effect of scale and low operating cost
Inactive Publication Date: 2021-09-10
JINCHUAN GROUP LIMITED
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Problems solved by technology
The operating temperature of this method is low, the equipment is not easy to corrode and scale, the concentration ratio of high-salt wastewater is high, and the produced water can be directly reused in production. However, this method needs to go through two stages of precipitation and clarification to remove heavy metals. There are many steps, and the scale of waste water de-heavy treatment is large
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[0024] Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:
[0025] The high-salt wastewater produced by the nickel electrolysis production line of the smelter has a nickel ion content of 50mg / L, a sodium sulfate concentration of 100g / L, a sodium carbonate concentration of 20g / L, and a salt content of 120g / L. The following steps are used for treatment:
[0026] (1) Pressurize the electrolytic nickel to leaching the pulp flash steam, wash the pulp flash steam by spraying, and then pass the flash steam with a temperature of 95°C and a pressure of 0.085MPa into a low-temperature evaporator as a heat source;
[0027] (2) Add sulfuric acid to nickel electrolysis high-salt wastewater to adjust the pH value of the wastewater to 6, and then add it to the low-temperature evaporator to concentrate and reduce the wastewater to produce concentrated water. During this step, the low-temperature evaporator The number of effects is 5, an...
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The invention provides a method for treating high-salinity wastewater of nickel electrolysis by utilizing flash steam. The method comprises the following steps: (1) carrying out flash steam treatment on electrodeposited nickel pressure leaching ore pulp and adding an obtained product into a low-temperature evaporator as a heat source; (2) adjusting the pH value of the high-salinity wastewater of nickel electrolysis and then adding the high-salinity wastewater of nickel electrolysis into a low-temperature evaporator for concentration and decrement to generate concentrated water; (3) adding the concentrated water into sulfuration heavy metal removal equipment for sulfuration heavy metal removal reaction, and carrying out precipitating and filtering to obtain a nickel-containing heavy metal filter cake; and (4) adding the nickel-containing heavy metal filter cake into filter pressing equipment for filtering and slagging to obtain nickel sulfide slag. The method disclosed by the invention is simple in process, low in operation temperature, low in energy consumption, low in operation cost and free from secondary pollution; valuable metal resources such as nickel can be recycled through sulfuration and heavy component removal of evaporation concentrated water, and the heavy component removal treatment scale of wastewater can be reduced; and the whole method achieves the purposes of water saving, emission reduction and wastewater recycling, achieves utilization of heavy metal resources and realizes cost reduction and efficiency improvement are achieved for enterprises.
Description
technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a method for treating nickel electrolysis high-salt wastewater by using flash steam. Background technique [0002] In the nickel electrolysis process of the smelter, the supernatant after precipitation of nickel ions by sodium carbonate is weak alkaline high-salt wastewater with a salt content of about 120g / L. The salt content of the wastewater mainly exists in the form of sodium sulfate and sodium carbonate, and contains nickel. Heavy metal ions such as heavy metal ions, high-salt wastewater cannot be used for production water, and the reuse rate of wastewater is difficult to meet the standard requirements. If such wastewater is discharged directly, it will damage the surrounding soil and water bodies, posing a serious threat to the ecological environment. [0003] At present, the treatment technologies for high-salt wastewater mainly include: (1) Membrane ...
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IPC IPC(8): C02F9/10C22B7/00C22B23/00C02F101/20
CPCC02F9/00C22B7/006C22B23/0461C02F2101/20C02F1/5281C02F2001/007C02F1/001C02F2301/08C02F1/06C02F1/16C02F1/66Y02P10/20
Inventor 李瑞基李瑞杰黄龙彭建华孙文亮徐建炎陈宋璇沈浩郭红兵宋莹石海明刘洋闫刚刚李朝阳高云静
Owner JINCHUAN GROUP LIMITED