稀释水对浮选入料的影响研究

Impact of dilution water on pulp flotation

针对兴隆庄选煤厂煤泥水系统处理能力不足,循环水浓度偏高等问题,分析了选煤厂浓缩机来料和溢流水性质,并以兴隆庄选煤厂循环水和蒸馏水作为浮选入料稀释水进行了浮选速度试验。结果表明,兴隆庄选煤厂循环水透射比维持在1.4%左右,循环水呈严重浑浊状态,说明循环水中含有大量细泥,循环水浓度偏高,一段浓缩处理效果不理想,无法满足生产需要。与蒸馏水相比,循环水作为浮选入料稀释水的精煤灰分和尾煤灰分分别提高了0.90%和3.58%,说明兴隆庄选煤厂循环水作浮选入料稀释水时,降低了浮选效率和浮选精煤质量。最后建议兴隆庄选煤厂煤泥水系统采用两段煤泥脱水回收工艺,精煤压滤机滤液和浮选尾矿去一段浓缩机浓缩沉淀,一段浓缩机底流滤液水去二段浓缩机,一段浓缩机溢流进入二段浓缩机浓缩,二段浓缩机溢流作为循环水使用。

In order to improve handing capacity of slime water processing system and reduce circulating water concentration in Xinglongzhuang coal preparation plant,the characteristics of material from thickener and overflow were analyzed.The circulating water and distilled water was used as the dilution water of pulp.The flotation rate test was carried out.The results showed that,the transmittance of circulating water maintained at about 1.4% and appeared turbid. High slime in circulating water indicated that the first stage thickening was failure.Taking circulating water as dilution water,compared with distilled water,the clean coal ash and tailings ash increased by 0. 90% and3. 58%,which showed that the flotation efficiency and clean coal quality was lowered. At last,the paper gave some improvement suggestions.The slime water processing system adopted two-stage dehydration technology,the filtrate from clean coal pressure filter and flotation tailings were sent to the first stage thickener,the filtrate and overflow from the first stage thickener were sent to the second stage thickener,the overflow of the second stage thickener was used as circulating water.