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在传统的磷酸盐矿浮选的(Crago)法中,先用脂肪酸再用胺分两次浮选给矿中存在的30%～40%(重量)的二氧化硅。因此,就捕收剂效率来说,Crago法效率很低。同时,磷酸盐采矿工业面临着更高的脂肪酸价格、更低的原料品位和更严格的环境法规问题。为此,美国佛罗里达磷酸盐研究院研究出一种胺—脂肪酸浮选流程,即逆“Crago”法。此工艺采用逐步添加小剂量胺凝聚物的方法,首先浮起细石英砂。用再表面活性剂/脂肪酸/燃料油混合物浮选预先浮选得到的精矿。采用7种不同特性原料,研究了此法的工艺和经济可行性,生产的精矿含30%～32%P_2O_5和4%～10%不溶物,P_2O_5回收率>93%。全部试剂的成本每吨精矿为2美元以下。这种新方法可简化现行的处理流程,取消酸洗回路,减少分级部分,并减少调浆槽数目。该法试剂消耗量大约为Crago法的1/3～1/2,并显著提高浮选回收率。同时研究了(在浮选给矿或水中的)矿泥的影响和减弱这种影响的工艺。
In the conventional Crago method, 30% to 40% by weight of silica present in the ore is first flotated twice with fatty acid re-amine. Therefore, the Crago method is inefficient in terms of collector efficiency. Meanwhile, the phosphate mining industry is facing higher prices for fatty acids, lower raw material levels and more stringent environmental regulations. To this end, the United States Florida Institute of Phosphate study developed an amine - fatty acid flotation process, the inverse “Crago ” method. This process uses a gradual addition of small doses of amine condensate method, first floating fine quartz sand. Flotation of the pre-flotation concentrate with a resurfat / fatty acid / fuel oil mixture. The process and economic feasibility of the process were studied by using seven kinds of raw materials with different characteristics. The concentrate produced contained 30% -32% P 2 O 5 and 4% -10% insoluble matter, and the recovery of P 2 O 5 was> 93%. The cost of all reagents is less than $ 2 per ton of concentrate. This new approach simplifies the current process, eliminates pickling loops, reduces staging, and reduces the number of shaker tanks. The reagent consumption is about Crage 1/3 ~ 1/2, and significantly improve the flotation recovery. At the same time, the effect of slime (in flotation of ore or water) and the process of reducing this effect were studied.