Method for recovering scandium from iron-aluminum smelting slag of laterite nickel ore
A technology of laterite nickel ore, iron and aluminum, applied in the field of metallurgy, can solve the problems of high content, easy to interfere with scandium, less content, etc., and achieve the effect of improving the extraction rate
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Embodiment 1
[0042] The element content of a laterite nickel ore is shown in Table 1, wherein the content of scandium is 0.0033%.
[0043] Table 1 Element content of laterite nickel ore and its concentration in high pressure acid leaching solution
[0044] the element
Content in laterite nickel ore (%)
Concentration in pickling solution (g / L)
Ni
1.07
3.85
co
0.1
0.32
Cu
<0.02
0.01
Fe
41.9
1.32
mn
0.653
2.05
Zn
〈0.05
0.11
Pb
〈0.02
<0.001
Si
7.15
0.094
Al
1.83
1.69
Ca
0.157
0.14
Mg
1.98
3.59
Cr
0.5
0.022
sc
0.0033
0.0117
[0045] The above-mentioned laterite nickel ore is leached with sulfuric acid in an autoclave at a temperature of 255 degrees Celsius and a pressure of 5 MPa. Most of the valuable metals scandium (0.0117g / L), nickel (3.85g / L), and cobalt (0.32g / L) enter the hig...
Embodiment 2
[0054] See Table 2 for the element content in a nickel hydroxide cobalt precipitate. Take the above-mentioned scandium hydroxide nickel cobalt precipitate, according to the solid-liquid ratio S:L=1:5, add 20% (mass percentage) sulfuric acid solution, stir and react for leaching, filter, and collect the filtrate. The filtrate mainly contains Ni, Co, Mn, Sc, Fe, Al, Ca.
[0055] Take the above-mentioned scandium hydroxide nickel cobalt sulfuric acid leaching solution, adjust the pH value to 0.5, according to the water phase: organic phase = 5:1, add the kerosene solution containing 10% N235 + 5% N503 to carry out the extraction reaction. The extraction percentage of Sc was 99.8%, and the extraction rates of Ni, Co, Fe, and Al were 0.1%, 0.2%, 1.0% and 0.2%, respectively. The extraction rate of impurities is low and separated from scandium. The loaded organic phase is washed with 5% sulfuric acid solution for 4 stages according to the water phase: organic phase = 2:1, and a sma...
Embodiment 3
[0059] The element content in the sulfuric acid leaching solution of a laterite nickel ore is shown in Table 1. The pH is adjusted to 3.8 with lye, so that the iron and aluminum in the leaching solution form iron and aluminum slag, and the scandium and iron and aluminum impurities are separated. Further, the pH is adjusted to 8.0 with lye, and the nickel-cobalt is precipitated to obtain the nickel-cobalt hydroxide precipitate. Scandium was enriched with the precipitation of nickel and cobalt hydroxide, with a content of 0.139%. The element content is shown in Table 3.
[0060] Table 3 Main element content in nickel hydroxide cobalt precipitation
[0061]
[0062] Take the above-mentioned scandium hydroxide nickel cobalt precipitate, according to the solid-liquid ratio S:L=1:5, add 20% (mass percentage) sulfuric acid solution, stir and react for leaching, filter, collect the filtrate to make the leachate, the filtrate mainly contains Ni, Co, Mn , Ca, Mg, Sc, Fe, Al.
[00...
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