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(a) Sulfide ore inhibitors
(b) non-ferrous metal oxide ores curing agent (activator)
(c) pH adjuster
(d) Deprotection of the sulfide ore mixed flotation product.
The mechanism of action of sodium sulfide in sulfide ore:
(a) Inhibition mechanism of inhibitors of sulfide ore
1. When the HS-ion concentration reaches a certain value, competitive adsorption occurs on the mineral surface, and HS-ion discharges the xanthate anion which has been adsorbed on the mineral surface.
2. The hydrophilic HS-ion itself adsorbs on the surface of the sulfide ore, increasing the hydrophilicity of the mineral because the mineral is inhibited.
3. The solubility product of the metal sulfide is smaller than the solubility product of the metal xanthate, and the S2- in the solution undergoes a displacement reaction with the anion of the xanthate, and the xanthate is squeezed out, thereby being inhibited.
(b) Activator of non-ferrous metal oxide ore
After the surface of the ore is vulcanized with Na2S, a vulcanized film is formed to activate the mineral, and floated with a xanthate collector .
The vulcanization white lead ore: PbCO3] PbCO3 + 2Na2S = PbCO3 ] PbS + 2Na2CO3
(c) a collector that desorbs the surface of the sulfide ore
Since HS- and S2- ions have a strong affinity for sulfide minerals, they can strongly adsorb on the mineral surface. As long as the concentration of these ions in the slurry is large enough, the adsorbed xanthate on the mineral surface can be desorbed.
6) Electric double layer (sten) model structure:
(1) What are the layers?
Inner layer (A)
Outer layer (tight layer B, diffusion layer D)
(2) What are the faces?
Surface, tight surface, slip surface C
(3) Points distributed on each face
(a) Surface potential (ψ0)
(b) Stern potential (ψδ)
(c) Dynamic potential (Ï›)
(4) Layer ions
Positioning ion
Negative tared ion
Hydration balance ion
7) Calculate the PH is 3.8 and the surface of the quartz point value of hematite, quartz, and the test to determine the possibility of sorting hematite (known quartz PZC = 2 The surface electrical mineral, hematite PZC = 7)
Solution: When PH=3.8,
It can be seen from the calculation results that under the condition of PH=3.8,
Hematite surface positively charged, negatively charged silica surface points, such as anionic collector with R - COOH buoyant hematite, such as with a cationic collector can RNH3- pumice England.
Conclusion: PH=2~6.5 may be used to sort hematite and quartz.
When pH>6.5 or PH<2, hematite and quartz cannot be separated.
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