关键词: 高含铁量长石矿石, 除铁增白, 脱泥, 高梯度磁选, 浮选

Abstract: A feldspar ore in Shandong province belongs to high-Fe feldspar ore，and ferrum mainly exists in form of iron minerals，mica，pyrite，and Fe-bearing alkali metal silicate. Experiments of iron removal and whitening were carried out in order to obtain high grade potassium feldspar as raw material for ceramic industry. Based on the ore property，the experiment was carried out through the process of grinding，desliming at 20 μm，magnetic iron removal by high gradient magnetic separation，pyrite removal by flotation using ethyl xanthate as collector，mice removal by flotation using lauryl amine + kerosene as collector，iron content alkali metal silicate removal by flotation using ZL-1 as collector. Through the experiment，feldspar concentrate with yield of 76.24%，Al₂O₃ recovery of 80.31%，Al₂O₃，K₂O+Na₂O，Fe₂O₃，content of 16.05%，12.50%，0.09%，whiteness of 67.26% is achieved respectively，which can reach the first-grade K-feldspar quality standards for ceramic industry.

Key words: High-Fe feldspar ore, Iron removal and whitening, Desliming, High gradient magnetic separation, Flotation