Copperas prepared by a reduction method of mechanically activated pyrite from pyrite cinder is featured by low cost, fast reaction speed and high quality.
以硫铁矿烧渣为原料，采用机械活化硫铁矿还原法制备绿矾具有成本低、反应快、产品质量高等优点。
High Rotation: low margin, high speed, exhaustive assets utilization, cost control, capital amount reduction.
快速流转：低毛利，高强度使用资产，高强度成本控制，减少资金沉淀量。
The present paper reviews the researches on braking disc energy heat and reduction of disc weight for high-speed trains.
综述提高高速列车制动盘能量和降低盘重方面的研究成果。
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