1. The main products of nickel electrolysis Brand Ni9999 Ni9996 Ni9990 Ni9950 Ni9920 Chemical The total amount of nickel and cobalt, not less than 99.99 99.96 99.9 99.5 99.2 learn Cobalt, not big 0.005 0.02 0.08 0.15 0.1 to make miscellaneous C 0.005 0.01 0.01 0.02 0.5 Minute quality Si 0.001 0.002 0.002 - - (%) Contain P 0.001 0.001 0.001 0.003 0.02 　 the amount, S 0.001 0.001 0.001 0.003 0.02 　 Do not Fe 0.002 0.01 0.02 0.2 0.5 　 Big Cu 0.0015 0.01 0.02 0.04 0.15 　 in Zn 0.001 0.0015 0.002 0.005 - 　 　 As 0.0008 0.0008 0.001 0.002 - 　 　 Cd 0.0003 0.0003 0.0008 0.002 - 　 　 Sn 0.0003 0.0003 0.0008 0.0025 - 　 　 Sb 0.0003 0.0003 0.0008 0.0025 - 　 　 Pb 0.0003 0.001 0.001 0.002 0.005 　 　 Bi 0.0003 0.0003 0.0008 0.0025 - 　 　 Al 0.001 - - - - 　 　 Mn 0.001 - - - - 　 　 Mg 0.001 0.001 0.002 - - Surface quality of electrolytic nickel: 1. Each grade of electrolytic nickel should be cleaned on the surface and the electrolyte in the interlayer, the surface is clean, and there is no contamination of the oil. Note: The Ni9920 grade can be an amorphous electrolytic nickel product. 2. Ni9999, Ni9996, Ni9990 brand electrolytic nickel should be subject to the following provisions: ( 1 ) The average thickness of electrolytic nickel should not be less than ( 2 ) The edges of the electrolysis shall not have dendritic agglomeration and dense pores (allowing for trimming). ( 3 ) The surface of electrolytic nickel shall not have a diameter greater than ( 4 ) The surface height of electrolytic nickel is greater than Note: Table 2 Examples of anode mud rate and chemical composition (%) of nickel sulfide electrolysis factory S Ni Cu Co Anode mud rate /% I factory 75～80 4 0.7 0.08 30 II factory 80 4~6 0.4 to 1 　 25~27 III factory ~70 2 to 3 0.25 0.02~0.03 25~30
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1) Electrolytic Nickel The ultimate goal of electrolysis is to produce electro-nickel. The chemical composition and physical specifications of the electro-nickel produced in China have met the requirements of the national standard GB/T6516-97, as shown in Table 1.
2) anode mud during anodic electrolysis nickel sulfide, nickel-containing anode plate, copper, iron, and cobalt into solution most of him, and elemental sulfur and undissolved sulfide is formed and the noble metal anode mud. The anode mud rate of nickel sulfide electrolysis in China is about 25% to 30%, the anode mud contains about 80% sulfur, and the nickel content is about 4%. After the anode mud is washed with water to recover the free metal, it is used as a raw material for extracting precious metals and producing sulfur. Table 2 shows examples of anode mud rate and anode mud chemical composition.
3) The anolyte purified electrolyte enters the anode region through the diaphragm bag and becomes an anolyte. The content of H + ions and impurity ions in the anolyte is greatly increased by the influence of the anode reaction. The anolyte continuously flows out of the electrolytic cell, and is sent to purify and remove impurities to produce a new electrolytic solution.
2. The main technical and economic indicators of nickel sulfide electrolytic refining Nickel sulfide electrolytic refining is the process of converting the applied electric energy into chemical energy to obtain pure metallurgical products on the cathode. Therefore, the current efficiency, the trough voltage, and the electric energy consumption must be carefully examined in production. The main technical and economic indicators that are strictly controlled.