【摘要】 在碳酸钠和六偏磷酸钠分散体系中,进行Ca2+、Mg2+、Fe2+、Al3+和Fe3+等金属离子对细粒一水硬铝石、高岭石、伊利石和叶腊石4种矿物分散行为影响的试验研究。结果表明,4种单矿物的分散行为受阳离子价数影响较大,而受阳离子种类的影响则不是特别明显。三价阳离子较二价阳离子的影响大,随着阳离子浓度的增加,4种单矿物的分散性均不同程度变差。不同分散剂体系下,Ca2+离子的加入消耗了体系中的CO32-和Na4P6O218-,从而降低了矿物颗粒表面ζ电位的绝对值,减小了颗粒间静电排斥作用能。Al3+的加入使得4种矿物的ζ电位值由负值增加到正值,可能是Al3+水解产生的羟基化合物在矿物表面吸附所致。更多还原

【Abstract】 The results of the test on the effect of Ca2+,Mg2+,Fe2+,Al3+ and Fe3+ on the dispersity of fine diaspore,kaolinite,illite and pyrophyllite in the dispersion system of sodium carbonate and sodium hexametaphosphate reveale that the dispersity of the four single minerals were affected more by the valence of cations than by the cation type,with the effect of trivalent cations greater than that of divalent cations.With the increase of the cation concentration,the dispersity of the four single minerals was deteriorated in various degrees.The addition of Ca2+ could consume the CO2-3and Na4P6O2-18 in the system,thus reducing the absolute value of ζ potential on mineral surface and in turn the static electric repulsion among mineral particles.The Al3+ addition made the ζ potential change from the negative value to a positive value,possibly due to the adsorption of the hydroxyl compound produced from the hydrolization of Al3+.更多还原