Selective Inhibition Of Calcite By Fenugreek Gum And Its Synergistic Mechanism With Polysaccharides

The selective inhibition of calcium-bearing minerals represented by calcite is a classic problem faced by the flotation field of skarn-type scheelite for a long time.At present,the commonly used inhibitors in flotation are water glass,phosphate,etc.,but these agents have disadvantages such as being harmful to the human body and unfriendly to the environment.Therefore,the research on low-cost,wide-ranging and environmentally friendly organic matter has become a hot issue in the current field of scheelite flotation.Fenugreek gum is a non-toxic and easily degradable natural gum,and has the potential to become a selective inhibitor due to its structure containing special functional groups that can interact with the surface of calcite.This paper takes scheelite and calcite as the research objects,innovatively introduces fenugreek gum as an inhibitor,and systematically studies the selective inhibitory effect of fenugreek gum on calcite and its mechanism under the system of sodium oleate as a collector.On this basis,the synergistic inhibitory effect and mechanism of fenugreek gum,sodium alginate and three CMC agents on calcite were briefly discussed.The main research contents are as follows:The flotation test results of single mineral and mixed mineral show that the recovery rate of both is close to 90%when fenugreek gum is not added,which cannot achieve the purpose of effective separation.After adding fenugreek gum as inhibitor,when the dosage of sodium oleate was 300 mg/L,the p H of the pulp was 7.5～8.7,and the dosage of fenugreek gum was 200 mg/L,the recoveries of scheelite and calcite were82.40%,22.00%,there is a significant difference in the flotation index.The artificial mixed ore test showed that when the amount of fenugreek gum was 40 mg/L,the grade and recovery rate of scheelite in the concentrate were 69.21%and 73.43%,which could preliminarily achieve the purpose of flotation separation.The dissolved components in the pulp have an impact on the flotation behavior of minerals.The single mineral flotation results show that the addition of Ca²⁺can significantly enhance the inhibitory effect of fenugreek gum,while inhibiting scheelite and calcite;the addition of CO₃^2-and WO₄^2-All have no effect on the flotation recovery rate of scheelite,and have a small effect on the inhibition effect of fenugreek gum.Surface analysis and test results such as Zeta potential,infrared spectroscopy and X-ray photoelectron spectroscopy show that when fenugreek gum acts alone,it can interact with calcium particles on the surface of scheelite and calcite,and adsorb on the two minerals in the form of chemical adsorption.When fenugreek gum and sodium oleate act together,the adsorption on the surface of calcite is still dominated by fenugreek gum,while the adsorption on the surface of scheelite is dominated by sodium oleate,which creates a good chemical adsorption for subsequent flotation separation.condition.Finally,the synergistic inhibitory effect of fenugreek gum,sodium alginate and three CMC agents on calcite and its mechanism were studied.The flotation results showed that when fenugreek gum,sodium alginate and three CMC agents synergistically inhibited calcite,the inhibitory effect was more significant than that when fenugreek gum was used alone.Through the detection of the apparent viscosity of the medicine,it can be found that fenugreek gum and other medicines have a certain synergy,which can effectively increase the apparent viscosity of each other.Through infrared spectroscopy analysis,it was found that the synergistic inhibitory effect of fenugreek gum and other agents was mainly achieved by co-adsorption on the mineral surface.