Insoluble anodic electrodeposition production process for nickel
A production process and electrowinning technology, which is applied in the field of nickel insoluble anode electrodeposition production process, and can solve the problems of inability to observe, low solid content, and black cathode plate.
Active Publication Date: 2014-08-27
CHENGDU INTERMENT TECH
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Problems solved by technology
In addition, before the electrolytic (electrolytic deposition) solution enters the electrolytic (electrolytic deposition) tank, it also needs to undergo solid-liquid separation and purification by a plate-and-frame filter press and a tubular filter. Low content, almost invisible to the naked eye
However, the surface of the cathode plate after electrolysis (electrodeposition) is generally darker, and there are many bumps on the surface
Method used
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[0015]
[0016] The insoluble anode electrowinning process for nickel was operated continuously for three cycles, each cycle running for 144 hours. Electrowinning without diaphragm. The specific process content is as follows:
[0017] 1) Parameters of pre-electrowinning solution
[0018] Ni content: 75~85g / l
[0019] Co content: 0.0022~0.0045g / l
[0020] Fe content: 0.0001~0.0005g / l
[0021] Na 2 SO4 content: 90~110g / l
[0022] Specific gravity: 1.1g / cm 3
[0023] Temperature: 70~80℃
[0024]Solid content: ≤500mg / l
[0025] pH: 3~3.5
[0026] 2) Precision membrane filtration
[0027] The sintered Ti-Al based alloy porous material membrane filter element was selected, and its average pore diameter was determined to be 4.6 μm by the bubble method. The operation steps of the membrane filtration device are as follows: a. In the preparation stage of starting up, pass clean water into the membrane filtration device to fully replace the air in the membrane filtration de...
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Abstract
The invention discloses an insoluble anodic electrodeposition production process for nickel, and the process can be used for obviously improving the quality of electro-nickel and reducing the power consumption in comparison with existing processes. The insoluble anodic electrodeposition production process for nickel disclosed by the invention is characterized by feeding a pre-nickel-electrodeposition liquid into a membrane filtration device to carry out precision membrane filtration firstly, wherein a porous membrane filter element with the average pore diameter of 2-8 mu m is selected, the filter differential pressure is 0.02-0.1 MPa, and the filtration temperature is 60-80 DEG C; then, discharging the filtered pre-nickel-electrodeposition liquid at a temperature of 60-80 DEG C to an electrodeposition cell and electrodepositing; under the conditions that the pH value of the pre-nickel-electrodeposition liquid discharged to the electrodeposition cell is controlled at 3-3.5, the cathode current density in the process of electrodeposition is 200-230 A / m<2>, and the e average cell voltage is 3-3.9 V, separating out electrodeposited nickel from a cathode. Compared with existing insoluble anodic electrodeposition production processes, the process disclosed by the invention has the advantages that the electro-nickel qualified rate and first-grade product pass rate of the insoluble anodic electrodeposition production process for nickel disclosed by the invention are greatly improved, the average cell voltage is reduced by about 0.3-0.4 V, and the power consumption is effectively reduced.
Description
technical field [0001] The invention relates to an electrochemical preparation process of metallic nickel, in particular to an insoluble anode electrowinning production process of nickel. Background technique [0002] The preparation process of metallic nickel mainly includes two kinds of soluble anode electrolysis and insoluble anode electrolysis. In the electrolysis (electrodeposition) process, in order to prevent impurities from being precipitated at the cathode, a diaphragm electrolysis (electrodeposition) process is used to ensure the quality of electrolytic nickel. In addition, before the electrolytic (electrolytic deposition) solution enters the electrolytic (electrolytic deposition) tank, it also needs to undergo solid-liquid separation and purification by a plate-and-frame filter press and a tubular filter. The content is so low that it is basically invisible to the naked eye. However, the surface of the cathode plate after electrolysis (electrodeposition) is gene...
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IPC IPC(8): C25C1/08
Inventor 高麟汪涛郑其灵刘超
Owner CHENGDU INTERMENT TECH