答：先把原矿石进行多级精选，然后再进行制砂，分级，磁选，最后再进行精提纯。
Answer: the first raw ore to multistage selected, and then made sand, grade, magnetic separation, finally carried out again pure purification.
螺旋分级机借助固体颗粒的比重不同而在液体中沉淀的速度不同的原理，对矿石混合物进行洗净、分级。
Spiral classifier with different proportion of solid particles in the liquid precipitation rate of different principle, to wash the mixture of ore, grading.
螺旋分级机借助固体颗粒的比重不同而在液体中沉淀的速度不同的原理，对矿石混合物进行分级。
Hierachial machine with different proportion of solid particles in the liquid precipitation speed different principle of minerals mixtures were classified.
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