Method for extracting selenium from nickel-molybdenum ore smelting smoke dust
A technology for nickel-molybdenum ore and soot, applied in the field of extracting selenium from nickel-molybdenum ore smelting soot, can solve the problems of easy leakage of toxic gas, low selenium recovery rate, flying dust, etc. The effect of low selenium and low operating temperature
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Embodiment 1
[0033] Press HCl and H 2 SO 4The molar ratio is 3:2 to prepare 100ml [H + ] is 8mol L -1 leaching agent, turn on the leaching stirring device to make the stirring speed 350r min -1 , set the leaching temperature to 95°C; after reaching the leaching temperature, add 20g of nickel-molybdenum ore smelting dust, and the mass ratio of NaClO 3 / Se=4.5 Add sodium chlorate at a rate of 35mg·min -1 g -1 (Se), leached for 150min; filtered and separated to obtain leachate and leach residue, the composition of which is shown in Table 1.
[0034] Table 1 Main components of leachate and leach residue
[0035] Se
As
Al
Fe
Mo
Ni
Leaching solution (g / L)
7.03
22.03
4.20
5.80
1.98
1.03
Leach residue (%)
0.07
0.41
3.46
2.52
0.07
0.13
[0036] *The volume of leaching solution (including washing solution) is 155ml, and the weight of leaching residue is 6.32g.
[0037...
Embodiment 2
[0042] Press HCl and H 2 SO 4 The molar ratio is 1:2 to prepare 100ml [H + ] is 6mol L -1 leaching agent, turn on the leaching stirring device to make the stirring speed 350r min -1 , set the leaching temperature to 95°C; after reaching the leaching temperature, add 20g of nickel-molybdenum ore smelting dust, and the mass ratio of NaClO 3 / Se=2.0 Add sodium chlorate at a rate of 30mg·min -1 g -1 (Se), leached for 150min; separated by filtration to obtain leachate and leach residue, the components of which are shown in Table 3.
[0043] Table 3 Main components of leachate and leach residue
[0044] Se
As
Al
Fe
Mo
Ni
Leaching solution (g / L)
7.3
23.41
4.12
5.71
2.13
0.98
Leach residue (%)
0.06
0.53
3.63
2.76
0.06
0.15
[0045] * The volume of leaching solution (including washing solution) is 150ml, and the weight of leaching residue is 6.30g.
[0...
Embodiment 3
[0051] Press HCl and H 2 SO 4 The molar ratio is 1:6 to prepare 100ml [H + ] is 5mol L -1 leaching agent, turn on the leaching stirring device to make the stirring speed 350r min -1 , set the leaching temperature to 75°C; after reaching the leaching temperature, add 20g of nickel-molybdenum ore smelting fumes, according to the mass ratio of NaClO 3 / Se=1.0 Add sodium chlorate at a rate of 40mg·min -1 g -1 (Se), leached for 150min; separated by filtration to obtain leachate and leach residue, the composition of which is shown in Table 5.
[0052] Table 5 Main components of leachate and leach residue
[0053] Se
As
Al
Fe
Mo
Ni
Leaching solution (g / L)
6.10
19.48
3.54
5.01
1.86
0.90
Leach residue (%)
0.08
0.71
3.83
2.94
0.12
0.18
[0054] *The volume of leaching liquid (including washing liquid) is 175ml, and the weight of leaching residue is 6.52g. ...
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