Effects of sodium silicate on flotation behavior of coal and kaolinite

in order to study the mechanism of selective inhilbiion of sodiunm sliate on cay minerals the fctaion behavior of coal and laoinite ith sodum silicaewere investigated by fiotation test.Zeta potential test and XPS analysis . The fotation experimentrsuls show that the separcaionefec isthe best.the recovery of cal s 60.44% and the ash content is 8.03% with 1 0o g /t NasSi0g in the p H of 7.TheZetapotentials of coal and laolinteshft egative y and the el crostatc repusin between the two minerals increase in presence of sodium slialte. The sufacepotential of coal and kaolin te decreases 6 m v and '16 m V with neuralp . The resits of PS show that the relative content of Si on the surface of coal and kaolite increases with sodium silicae,the decrement of Si 2p inding enegy of cal and caol ilie is-0. 2 e v and-0.19 e v respectivly.Accarding to the resuts of P it can be concluded that sodum sili ate is absored on the surace of coal and kaoinie by physical adsorption,the different adsorption capacity of the two minerals makes sodium silicate own selective inhibition