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Niobec公司目前正在魁北克省希库蒂米地区处理铌矿石。烧绿石矿物存在于含5～7%磷灰石的碳酸盐矿床中。矿石磨至-65目并脱去小于10微米的矿泥。首先用脂肪酸乳浊液浮出碳酸盐,并将其排到尾矿中,从而保证烧绿石精选所需要的适宣的浮选条件。碳酸盐精矿65%为-44微米,它由白云石、方解石、22%的磷灰石及少最的硅酸盐组成。为了确定从碳酸盐精矿中提取磷灰石的可能性,已进行了实验室研究并据此拟定出了经济上合理的流程,以生产高品位磷灰石精矿。用磷酸抑制磷灰石并用硫酸将pH值调至4.8～5.0,脂肪酸的添加量以使碳酸盐能有效的浮选为宜。在第二段浮选中,磷灰石精矿中的硅酸盐在用AlCl_3抑制磷灰石条件下用仲胺作捕收剂将其浮选出。实验室试验结果表明,生产出含38.3%P_2O_5(83.7%BPL)的磷灰石精矿、并达到66.2%的回收率是可能的。选矿厂的中间试验厂的试验,得到了含34%P_2O_5的精矿,回收率为76%。
Niobec is currently processing niobium ore in the Kokutami area of Quebec. Pyrochlore minerals are found in carbonate deposits containing 5 to 7% apatite. The ore is milled to -65 mesh and stripped of slime less than 10 microns. Floating the carbonate first with the fatty acid emulsion and draining it into the tailings ensures the proper flotation conditions for the pyrochlore selection. Carbonate concentrate 65% is -44 micron, which consists of dolomite, calcite, 22% apatite and less silicate. To determine the possibility of extracting apatite from carbonate concentrates, laboratory studies have been conducted and an economically rational process has been developed to produce high-grade apatite concentrates. Inhibit apatite with phosphoric acid and adjust the pH to 4.8-5.0 with sulfuric acid. The addition amount of fatty acid should make flotation of carbonate effective. In the second stage of flotation, silicates in apatite concentrate are flotated with secondary amines as a collector under the control of apatite with apatite. Laboratory tests show that it is possible to produce apatite concentrate containing 38.3% P 2 O 5 (83.7% BPL) with a 66.2% recovery. In the pilot plant of the pilot plant, 34% P 2 O 5 concentrate was recovered with a recovery of 76%.