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通过对煤粒表面Zeta电位的分析、浮选过程中煤泥颗粒大小的量化评价和矿浆流变性能的研究,探讨了氯化钠对煤泥浮选的影响及作用机理.结果表明:氯化钠的加入降低了煤粒表面的Zeta电位,从而减弱了煤粒之间及煤粒与气泡之间的静电斥力作用,进而促进颗粒之间的凝聚以及颗粒与气泡之间的碰撞和黏附效果;随着氯化钠浓度的增大,矿浆的黏度及表观粒径逐渐增大,这也进一步验证了氯化钠的添加促进了煤粒之间的凝聚,可以使浮选泡沫更加稳定,进而提高煤泥的可燃体回收率.与去离子水体系相比,当氯化钠添加浓度达到0.2mol/L时,煤泥浮选的可燃体回收率提高约26个百分点,达到90.71%.
Through the analysis of Zeta potential on the surface of coal particles, the quantitative evaluation of slime particle size in flotation process and the research on the rheological properties of the slurry, the effect and mechanism of sodium chloride on flotation of slime were discussed.The results showed that: The addition of sodium reduces the Zeta potential on the surface of the coal particles, thus weakening the electrostatic repulsion between the coal particles and between the coal particles and the bubbles, thereby promoting the agglomeration of the particles and the collision and adhesion between the particles and the bubbles. With the increase of sodium chloride concentration, the viscosity and apparent particle size of the pulp gradually increased, which also further verified that the addition of sodium chloride promoted the agglomeration of the coal particles and made the flotation foam more stable. Improve the combustibility of coal slime recovery.Compared with deionized water system, when the concentration of sodium chloride reached 0.2mol / L, the flotation recovery of coal flotation increased by about 26 percentage points to 90.71%.