Abstract： Medium chrome yellow was modified by stearic acid. The technology and mechanism of the modification of medium chrome yellow by stearic acid was investigated. The results show that the oil adsorption is reduced gradually from 0.22 to 0.15 g/g， and about 30% is reduced. The sedimentation time is increased from 1 to 28 h with increasing of the dosage of stearic acid. The fluidity is not improved. The modified effect is optimal when the mass fraction of stearic acid is 2.5% to 3.5%. The dispersity of the modified medium chrome yellow in dry state is obviously improved. The stearic acid modifies medium chrome yellow through the adsorption of Pb²⁺in PbCrO₄ by the bond of —COO- .

Keywords: medium chrome yellow; stearic acid; modification; mechanism

中图分类号：TQ622.1           文献标志码：A

文章编号：1008-5548（2014）06-0074-03

DOI:10.13732/j.issn.1008-5548.2014.06.018

收稿日期：2014-08-03， 修回日期：2014-08-18，在线出版时间：2014-12-22。

第一作者简介：祖占良（1963—），男，高级工程师，研究方向为非金属矿物加工与应用。 E-mail：zuzhanliang@126.com。