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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, HPO₄^2-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.

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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（PO₃）_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HPO₄^2-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。

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舒有顺（1995—），男，云南昭通人，硕士研究生，主要研究方向为矿产资源综合利用。

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舒有顺（1995—），男，云南昭通人，硕士研究生，主要研究方向为矿产资源综合利用。

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