(中南大學(xué) 礦物工程系， 長沙 410083)
摘 要: 研究了一水硬鋁石和高嶺石、葉蠟石及伊利石等幾種含鋁硅酸鹽礦物在不同pH條件下的動電行為與浮選行為。一水硬鋁石、高嶺石、葉蠟石及伊利石的等電點(IEP)分別為pH 6.2，4.3，2.0，3.4。在pH>IEP時，烷基胺類陽離子捕收劑主要以靜電作用吸附在一水硬鋁石礦物表面，其浮選高嶺石等3種鋁硅酸鹽礦物的可浮性大小順序是葉蠟石>高嶺石>伊利石。高嶺石、葉蠟石和伊利石均是層狀硅酸鹽礦物，其破碎磨細(xì)時，將沿層間斷裂，由于晶體結(jié)構(gòu)的原因其層面荷負(fù)電荷。烷基胺類陽離子捕收劑以靜電作用力吸附于鋁硅酸鹽礦物表面的層面使礦物疏水上浮。
關(guān)鍵字: 一水硬鋁石； 鋁硅酸鹽礦物； 浮選
aluminium-silicate minerals with alkyl-amine collectors
WANG Yu-hua， WANG Dian-zuo
（Department of Mineral Engineering, Central South University,
Changsha 410083, P.R.China）
Abstract: The electrokinetic properties and flotation of diaspore, kaolinite, illite and pyrophillite with alkyl-amine collectors were studied. IEPs of diaspore, kaolinite, illite and pyrophyllite are pH 6.2, 4.3, 3.4 and 2.0 respectively. There is electrostatic interaction between diaspore and alkyl-amine. When the diaspore is positively charged, the flotation recovery of diaspore is low with alkyl-amine. If the pH value is higher than that of the precipitation of RNH2, the flotation recovery of diaspore will reduce. There is also electrostatic interaction between aluminium-silicate minerals (kaolinite, pyropyyllite and illite) and alkyl-amine. The floatabilities are pyrophyllite>kaolinite>illite. Kaolinite, pyrophyllite and illite are layers type silicate. Their sheets are negatively charged in all pH range. The alkyl-amine cation can adsorb on the negatively charged sheets. IR measurements also demonstrate only physicoadsorption interaction takes place between aluminium-silicate minerals (kaolinite, pyrophyllite and illite) and alkyl-amine.
Key words: diaspore; aluminium-silicate minerals; flotation
