Research On Flotation For Desilication Of High-silicon Brucite Ore In Kuandian Of Liaoning

There are abundant brusite resources in Liaoning Province with reserves of10million tons. With the rapid course of economic development, it becomes very important to rationally develop and utilize existing brusite resources in Liaoning Province. At present, mining brusite ore from Liaoning Province, high in mineral grade, is exported partly and the rest is used to produce magnesia refractory materials and magnesium chemical products. Because mining enterprises adopt high grade ore and abandon low one, most of low grade brusite ore with high silicon has been discarded, resulting in a great loss of brusite resources. Therefore, continue to fully utilize these high silicon brusite ore and to actively develop the deep processing and complex utilization of brusite ore has profound realistic significance.This paper systematically investigated the flotability of brusite, lizardite and dolomite and metal ions influence on the mineral flotation in the sodium oleate flotation system. Regulators influence on the flotability of lizardite was investigated in order to find out appropriate separating process and efficient selective inhibitors so that brusite and lizardite can be separated effectively. Following conclusions are drawn through flotation tests, zeta potential measurements and FTIR-DRIR:1. The floatability of brusite and lizardite was different from each other in the sodium oleate flotation system. The effect of Ca2、Mg2+on the floatability of lizardite would be modest while Ca2+and Mg2+have activation on the flotation of brusite. Fe3+and Al3+have activation on the flotation of lizardite, when the dosage of Fe+and Al+is less than120mg/L, they have activation on the flotation of brusite, when the dosage of Fe3+and Al3+is over120mg/L, they have inhibiting effect on the flotation of brusite.2. Experiment research showed that sodium silicate, sodium hexametaphosphate and citric acid had a good separating effect on the manually mixed ore, brusite recovery in the concentrate was over80%and the grade of SiO2declined remarkably.3. The process of one stage grinding-single stage roughing-single stage scavenging-four stage cleaning was adopted to separate brusite and lizardite, grinding fineness-0.074mm accounted for75%. Taking sodium silicate as inhibitor and sodium oleate as collector, Open-circuit flotation test was carried out and the results are as follows:the grade of SiO2for concentrate is3.6%, brusite recovery43.83%, yield43.32%, the grade of SiO2for tailings is23.62%.4. It can be inferred that sodium oleate adsorbed Mg containing minerals mainly via chemical adsorption under alkaline conditions. With increase of pH value, Mg containing minerals recovery increases. However, when pH value is high, the concentration of OH-in slurry sharply increases. As a result, competive adsorption of OH-and RCOO-occurred mainly on the surface of mineral, resulting in a great decrease of chance for the combination of RCOO-and Mg(OH)+. At the same time, Mg(OH)2generated, easily fall off from the surface of mineral. Based on the above analysis, Mg containing minerals recovery declined after the turning point.Research on the flotation for desilication of high-silicon brusite ore was carried out, and it has important guiding significance for the efficient exploitation and utilization of high-silicon brusite ore. At the same time the research can enrich brusite flotation theory in some degree, and also makes an exploration for the comprehensive utilization of existing resources.