Flotation separation of scheelite from calcite using pectin as depressant
Flotation separation of scheelite from calcite using pectin as depressant
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以果胶为抑制剂浮选分离白钨矿和方解石
DOI：
10.1016/j.mineng.2019.03.019
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发表时间：
2019-06-01
影响因子：
4.8
通讯作者：
Hu, Chenqiang
中科院分区：
文献类型：
--
作者：
Jiao, Fen;Dong, Liuyang;Hu, Chenqiang
本文研究了高分子多糖果胶对白钨矿与方解石优先浮选分离的抑制作用。通过Zeta电位实验、FTIR分析和XPS分析，解释了果胶对两种矿物的选择性抑制机理。微浮选实验表明，果胶对方解石有较强的抑制作用，但在pH 7 ~ 9范围内对白钨矿的可浮性影响不大。方解石的浮选回收率急剧下降至4.56%，而白钨矿在pH 7.5时仍保持71.01%的高浮选回收率。一系列机理实验表明，白钨矿和方解石表面的定域离子主要是钨酸盐和钙物种，方解石表面的优势组分主要是带正电荷的钙物种。果胶分子链上的羧基可以与方解石表面的钙物种发生化学螯合作用，并吸附在方解石表面。果胶的大量吸附阻碍了捕收剂油酸钠（NaOL）在方解石表面的进一步吸附，从而大大降低了方解石的可浮性，最终实现两种矿物的浮选分离。最后得到了果胶的吸附模型和两种矿物之间的分离模型。
In this paper, pectin, a polymer polysaccharide, was studied for its depression during the selective flotation separation of scheelite from calcite. Zeta potential experiment, FTIR analysis and XPS analysis were used to explain the selective depression mechanism of pectin on the two minerals. The microflotation experiment showed that the pectin had a strong depressive effect on the calcite, but had little effect on the floatability of the scheelite in the pH range of 7-9. The flotation recovery of calcite dropped sharply to 4.56%, while scheelite still maintained a high flotation recovery of 71.01% at pH 7.5. A series of mechanism experiments showed that the localized ions on the surface of scheelite and calcite were mainly tungstate and calcium species, and the dominant component on the calcite surface was mainly positively charged calcium species. The carboxyl groups on the pectin molecular chains can be chemically chelated with the calcium species on the calcite surface and adsorbed on the calcite surface. The large amount of adsorption of pectin hindered the further adsorption of the collector sodium oleate (NaOL) on calcite surface, thereby greatly reducing the floatability of calcite, and finally achieving the flotation separation of the two minerals. Finally, the adsorption model of pectin and the separation model between the two minerals can be obtained.