Phosphoric acid was selected as bond to make phosphate rock powder into ball material.

研究选用磷酸作粘结剂，使碎磷矿粉粘结成型。

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The effect of porous silicon rock powder mixing with ordinary Portland cement on properties of cement is studied.

研究了多孔硅质岩矿粉掺入到普通硅酸盐水泥中对水泥性能的影响。

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P-solubilizing effects study results showed that strain P17 could facilitate solution of phosphate rock powder from different sources.

解磷微生物溶磷效果研究表明P17菌株接种不同来源磷矿粉为唯一磷源的发酵液中均使发酵液有效磷含量增加。

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But it is not easy to get at. Specks of gold embedded in the mountain rock can only be extracted by blasting and crushing the rock to powder.

VOA: standard.2010.04.22

Eventually, though, the drill will go deep enough to push rock powder into the drill's sample-gathering chamber.

BBC: Curiosity Mars rover spins its rock drill

Just before halting its investigations, the nuclear-powered rover used the drill at the end of its 7-foot-long robotic arm to bore into a rock near where it landed and analyze the powder.

NPR: Mars Rover Curiosity Stands Down After New Problem

Scientists need to be sure that when the big hammer tool turns in a rock it breaks the surface into a useable powder that will not clog or damage the sample handling mechanism.

BBC: Curiosity Mars rover deploys its rock brush