floatation cost of bonds 发行债券费用
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Due to the use of amine collector, the double reverse floatation flow had overcome the shortage of heating in the routine floatation of phosphorus, and its drug cost was relatively low.
双反浮选流程由于使用了阳离子胺类捕收剂，一定程度上克服了胶磷矿常规浮选需要加温的缺点，并且药剂成本较低。
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