Beneficiation methods for feldspar and quartz flotation separation
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Alkaline flotation method
Quartz and feldspar are divided into alkaline ore pulp with pH value of 11-12, alkaline earth metal ions are active agents, and alkyl sulfonates are scavengers. Quartz is the first choice for reverse flotation, and appropriate non-ionic surfactants can be added. Significantly improve the recovery of quartz.
Under alkaline conditions, the neutral complexes [such as Ca(OH)+RSO3-] formed by metal ions and alkyl sulfonates play a key role. These neutral complexes adsorb on the quartz surface together with free sulfonate ions, forming a hydrated layer under high alkaline conditions.
Acid flotation method
The acid flotation method is to use anionic and cationic mixed collectors in the acidic pulp with a pH value of 2-3 to preferentially select feldspar. According to the different reagents used, the method can be divided into fluorine flotation and fluorine-free flotation.
Fluorine flotation method
Under the activation of strong acid and fluoride ions, feldspar preferentially uses cation scavengers. The key to achieving flotation selectivity is to adjust the pH of the slurry solution. When pH=2, quartz is close to the zero electric point, while feldspar generally has a zero electric point pH=1.4~1.7. Under the activation of fluoride ions, the surface negative potential is enhanced, and the quartz surface is basically not charged. Amine cations are first adsorbed on the feldspar surface, making the surface hydrophobic.
Under strong acid conditions, the anion scavenger is mixed with dodecyl sulfonate and diamine cation scavenger, and the anion scavenger combines with the diamine scavenger adsorbed on the feldspar surface to form co-adsorption and improve the hydrophobicity of the feldspar surface. sex.
Neutral flotation method
In the neutral medium, both feldspar and quartz are charged, but there are still local charged areas on the quartz surface. With the help of static electricity and hydrogen bonding, the oleate ion is adsorbed in a small amount and is unstable. Under the action of inhibitors such as sodium hexametaphosphate, the surface adsorption starvation agent oleate can be removed.
The adsorption of oleate by feldspar is mainly Al3+ chemical adsorption, which is relatively firm. Sodium hexametaphosphate cannot remove this adsorbed oleate. Feldspar surface has a small amount of Al3+ and limited hydrophobicity, so feldspar cannot be given priority. But the oleate ion adsorbed on the feldspar surface can be used as an anion active site, and then adsorb the amine cation scavenger.
In neutral media, the key to the separation of feldspar and quartz is to select a suitable and effective inhibitor, which can not only absorb the oleate ions adsorbed on the quartz surface, but also prevent the adsorption of amine cation scavengers on the quartz surface.
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