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用循环水和自来水作为浮选试验用水,用石膏和硫酸钾作为水质调整剂,通过实验室和工业试验,研究水质硬度对煤泥浮选的影响.结果表明:水质硬度是影响煤和黏土颗粒之间分散稳定性的关键因素.随着水质硬度的升高,浮选精煤灰分提高了1%~2%,但精煤产率没有明显变化.水质硬度小于35°DH时,水质硬度越高,煤和黏土颗粒之间的凝聚作用越强,精煤灰分越高;水质硬度大于35°DH时,这种凝聚作用不再增强,精煤灰分也不再提高.
Using circulating water and tap water as flotation test water and gypsum and potassium sulfate as water quality adjusting agent, the effects of water hardness on flotation of coal slime were studied through laboratory and industrial tests.The results showed that water hardness affected coal and clay particles With the hardness of water increased, flotation of fine coal ash increased by 1% to 2%, but no significant change in the yield of refined coal.When the water hardness is less than 35 ° DH, the water hardness The higher the cohesion between coal and clay particles, the higher the ash content of the fine coal. When the water hardness is greater than 35 ° DH, the cohesion does not increase and the ash content of the fine coal no longer increases.