Mix-collecting Mechanism And Application Of Fluorite

Fluorite is an important mineral resource of fluorine, which widely used in themetallurgy, cement, chemical industry, etc, so it is reserved by many countries as thestrategic resources. Flotation is considered as the most effective method of fluoriteseparation, and the effect of flotation is related closely with flotation reagents. Sodium oleatewhich has better collecting performance is common used as collector in fluorite flotation,but its application is limited by its poor water-soluble, no resistance of hard water and highpulp temperature. So the research of room temperature collectors has become focus offluorite flotation in recent years. For the shortcomings of sodium oleate, DYY wascompounded and its application in fluorite flotation was studied. At the end of the paper, themechanism of collectors was discussed by Zeta potential and FTIR mehods.The results of pure mineral test showed that: fluorite and quartz could be better collectedby using DYN-1, DYN-2and sodium oleate. As the higher fluorite recovery could bereceived in lower dosage by using DYN-1, so it was chosen as the basis of mix-collector.The performance of different surfactants in collecting fluorite was studied, the resultsshowed that they have poor collecting ability of fluorite. When surfactants were added toDYN-1with different proportion, the performance of DYN-1was improved. Then the mix-collector called DYY was compounded based on it. The results of pure mineral flotationusing DYY showed that: pH was6, DYY dosage was600g/t, recovery is best with94.90%.According to the results of the pure mineral test, DYY was used in Shangluo fluoriteore and Nanyang fluorite ore, and flotation test results were compared with sodium oleate.Using one roughing flowsheet, DYY was contrasted with sodium oleate in Shangluo fluorite.The results showed: using sodium oleate as collector, concentrate withCaF2grade of81.26%and recovery of94.91%was obtained, pulp temperature was35℃. The orthogonal testwere designed to optimize DYY effect at room temperature, the results showed:concentratewith grade of85.55%and recovery of95.61%was obtained, pulp temperature was20℃. Using one roughing-one scavenging flowsheet, DYY was contrasted with sodiumoleate in Nanyang fluorite. The results showed that: using sodium oleate as collector,concentrate withCaF2grade of62.57%,CaCO3grade of10.01%and recovery of97.32%was obtained, pulp temperature was35℃. using DYY as collector, concentrate withgrade of72.13%, grade of7.98%and recovery of98.02%was obtained, pulptemperature was25℃.The above results showed: mix-collector has stronger ability forcollecting fluorite than sodium oleate for different types of fluorite. The mechanism of the collector absorbed on mineral was analyzed using Zeta potential,FTIR spectroscopy, and laser grain-size test methods. The results showed that the style ofsodium oleate adsorbed on the mineral surface was physical adsorption and chemicaladsorption; the style of mix-collector DYY adsorbed on the mineral surface was physicaladsorption, hydrogen-bonding adsorption and chemical adsorption. The laser grain-size testresults showed that: compared with sodium oleate, mix-collector had a stronger effect onhydrophobic flocculation of fluorite.