本试验是针对平山县罗圈矿区的,该矿区的矿物组合为矽线石,石英、钾长石、白云母黑云母,钛磁(赤)铁矿等矿物。本方法用氢氟酸为选择性溶剂,先将样品经过800℃以上的高温灼烧,而后再用氢氟酸在室温下浸泡,过滤分离其它含铝矿物,用EDTA容量法测定出矽线石中三氧化二铝含量,换算出矽线石含量。(一)选择性溶解最佳条件的选择 This experiment is aimed at the Luozhang mining area in Pingshan County. The mineral assemblage in this mining area is composed of sillimanite, quartz, potassium feldspar, mica mica and titanium magnetite. The method uses hydrofluoric acid as a selective solvent, firstly burning the sample through a high temperature above 800 DEG C, then soaking the hydrofluoric acid at room temperature, filtering and separating other aluminum-containing minerals, and determining the sillimanite by the EDTA volumetric method In the aluminum oxide content, converted to sillimanite content. (A) the choice of the optimal conditions for selective dissolution