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团聚是颗粒形成絮团的一个过程 ,它会影响浮选的选择性。本文中提出了测量团聚作用的方法 ,并用该法对选矿进行监测。将沉降速度和紊流度转换成团聚指数 (AI)来度量团聚作用。在所试验的条件和正常 pH下 ,分散程度最大时的AI值为 0 ,团聚作用最强时的AI为 1。 4个选矿厂铜和锌浮选段的监测表明 ,在 pH高于 9时 ,AI值比较高。对工艺水中的金属离子 (主要为镁离子和钙离子 )进行了研究 ,以确定它们对团聚作用的影响。研究表明 ,在pH 9～ 12范围内 ,镁的存在可改变AI值。在pH >9时 ,镁才对团聚起作用。高于此 pH值时 ,镁形成了氢氧化物组分 ,其中包括Mg(OH) 2 沉淀。团聚机理与这种沉淀有关 ,可能通过静电桥联引起的。本文讨论了在浮选实践中由团聚产生的一些问题和机遇。
Reunion is the process by which particles form flocs that affect the flotation selectivity. In this paper, a method of measuring agglomeration is proposed, and the method is used to monitor the beneficiation. The settling velocity and turbulence were converted to agglomeration index (AI) to measure agglomeration. At the conditions tested and at normal pH, the AI with the highest degree of dispersion was 0 and the AI with the highest agglomeration was 1. Monitoring of copper and zinc flotation sections at the four concentrators showed that the AI was higher at pH levels above 9. Metal ions in the process water (mainly magnesium and calcium) were studied to determine their effect on agglomeration. Studies have shown that in the pH range of 9 to 12, the presence of magnesium can change the AI value. At pH> 9, magnesium acts only on agglomeration. Above this pH, magnesium forms hydroxide components, including Mg (OH) 2 precipitation. The agglomeration mechanism is related to this precipitation and may be caused by electrostatic bridging. This article discusses some of the problems and opportunities that arise from agglomeration in flotation practice.