Method for extracting selenium from nickel-molybdenum ore smelting smoke dust
A technology of nickel-molybdenum ore and dust, which is applied in the field of extracting selenium from nickel-molybdenum ore smelting dust, can solve the problems of easy leakage of toxic gas, low selenium recovery rate, environmental pollution, etc., and reduce equipment maintenance costs and production costs. The effect of low selenium and high selenium content
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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.
[00...
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.
...
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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