石英砂原矿质量的优劣，有害杂质铁、铝的赋存状态及其在各粒级砂矿中的分布，是决定选矿效果的关键。
A key to ore dressing of quartz sands includes rude ores of high or low quality, occurrence and distribution of detrimental impurity such as iron and aluminium in size grades of placer deposits.
本文综合论述灰砂砖生产中砂子颗粒级配的影响、要求和重要作用以及应当进行控制的工艺环节和措施。
The paper describes influence, importance and requirements of sand grain composition and its control methods in the sand-lime brick production.
细粒级尾砂絮凝沉降性能是全尾砂充填应用中的核心问题之一。
The flocculating settling characteristics of fine tailings is one of the key problems in application of filling by all tailings.
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