六偏磷酸钠对钾长石和赤铁矿的分散作用机理  

Dispersion Mechanism of Sodium Hexametaphosphate on Potassium Feldspar and Hematite

作　　者：舒有顺 曾海鹏 黄红军[1] SHU Youshun;ZENG Haipeng;HUANG Hongjun(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《矿冶工程》2023年第2期61-65,共5页Mining and Metallurgical Engineering

基　　金：高等学校学科创新引智计划资助(B14034)。

摘　　要：通过沉降率实验、浊度实验、Zeta电位测定、溶液化学分析以及扩展DLVO理论分析,揭示了六偏磷酸钠对微细粒钾长石和赤铁矿的分散作用。结果表明,六偏磷酸钠电离产生的Na_(m)(PO_(3))_(n)^(m-n)(m<n)阴离子会以螺旋状长链聚合体形式包裹在矿粒表面,形成厚厚的大分子亲水保护膜;水解生成的HPO_(4)^(2-)会吸附在矿粒表面,导致矿粒表面电位降低、矿粒间静电斥力以及空间位阻效应增强,矿粒达到稳定凝聚态需要克服的势垒增大,矿粒间非选择性团聚现象减弱,分散体系稳定性显著增强。By performing settling rate test,turbidity test,zeta potential measurements,solution chemistry study and extended DLVO theoretical analysis,the mechanism for sodium hexametaphosphate(SHMP)to disperse ultrafine potassium feldspar and hematite was investigated.It is shown that,Na_(m)(PO_(3))_(n)^(m-n)(m<n)anions derived from SHMP ionization can wrap around mineral grains in a form of spiral long⁃chain polymers,forming thick hydrophilic macromolecule protective films.Meanwhile,HPO_(4)^(2-)formed by hydrolysis can be adsorbed onto ore grains,leading to decrease of the surface potential and increase of the interparticle electrostatic and steric repulsions.In this case,mineral particles need to overcome a higher potential barrier to reach a stable condensed state.Therewith,the non⁃selective agglomeration of ore particles weakens,resulting in a significant improvement in dispersion stability.

关 键 词：分散 六偏磷酸钠 钾长石 赤铁矿 扩展DLVO理论 

分 类 号：O647[理学—物理化学]