Ca2对钛铁矿与钛辉石浮选行为的影响-中南大学学报.PDFVIP

42 3 () Vol.42 No.3 2011 3 Journal of Central South University (Science and Technology) Mar. 2011 Ca2+ ( 410083) Ca2+ Ca2+ Ca2+ pH pH pH Ca2+ 2 Ca2+Ca2+ Ca2+ TD91 A 1672−7207(2011)03−0561−07 Influence of calcium ion on flotation of ilmenite and titanaugite ZHANG Guo-fan,YAN Dai-cui, ZHU Yang-ge, FENG Qi-ming, OU Le-ming, LU Yi-ping (School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China) Abstract: The solubility behavior of mineral surface ions and effects of Ca2+ on flotation of ilmenite and titanaugite were investigated. The results show that the addition of Ca2+ into pulp has little impact on ilmenite flotation, while it can activate titanaugite flotation. Large numbers of Ca2+ may dissolve into pulp from mineral surface in flotation process. When solvent ions are removed, the floatability of ilmenite changes little under weak acid pH condition but deteriorates obviously under the alkaline pH condition. On the other hand, the poor floatability of titanaugite is found in the whole pH range. Addition of Ca2+ into flotation pulp which is isolated from solvent ions will partly recover the floatability of these two minerals under alkaline condition. The main reason of activation of titanaugite is that Ca2+ increases active sites for the oleate adsorption on the surface of titanaugit which results from the adsorption of carboxyl complexes and precipitation of hydroxide of Ca2+. Key words: ilmenite; titanaugite; calcium ion; flotation; dissolution 19 µm [3−5] [1−2] 19 µm