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在以往的研究中已表明,泡沫浮选法对回收中间产物中的重物料是较有效的,但这些重物料对细煤的回收率-品位特性是有不利影响的。试验及理论研究的结果表明,采用浮选柱多段选别作业时,中间产物中重物料的回收率可从25%降到10%,从而改善了总的选别效能。对-48目的煤样进行的试验表明,采用粗选-精选浮选柱回路时所得的精煤产率可提高7%,而获得的浮选精煤中灰分仅为8%。采用不同的浮选柱对-65目的煤样进行选别时也得到了相近的结果。为了从基本原理上评价浮选柱多段选别的适用性,已建立了一种连续操作的浮选柱模型,这种模型包括选择性的和非选择性的泡沫脱落及给料成分的浮选动力学过程。已表明,在动力学速率受限制的条件下,采用浮选柱多段选别时经济的合理性应根据产品品位和/或产率的提高程度而确定。
In previous studies it has been shown that froth flotation is more efficient for the recovery of heavy materials in intermediate products, but these heavy materials have a negative effect on the recovery of fine coal, grade properties. The experimental and theoretical studies show that the recovery of heavy materials in the intermediate product can be reduced from 25% to 10% with the flotation column multistage sorting operation, thus improving the overall sorting efficiency. Tests on a -48-mesh coal showed that the yield of clean coal was increased by 7% using rougher-flotation column circuits while the ash content of the flotation concentrate obtained was only 8%. Similar results were obtained when using different flotation columns for the sorting of -65 purpose coal samples. In order to evaluate the applicability of multistage sorting of flotation columns on a fundamental basis, a continuously operating flotation column model has been established that includes both selective and non-selective bubble shedding and flotation of feed ingredients Kinetic process. It has been shown that the economic justification for the use of flotation column multistage sorting should be based on the degree of improvement in product grade and / or yield under conditions of limited kinetic rates.