The chemical contents in the sand quartz has reached national standards of silicon raw material for plate glass production after combined treating by magnetic separation plus diluted acid dipping.
采用磁选分离法+稀酸浸泡法联合处理后，使该地石英砂的化学成分达到了优质的生产平板玻璃用硅质原料的国家标准。
Foamed concrete series products with cement, coal ash as raw materials, in line with the state advocates green environmental protection building of energy-saving material standards and requirements.
泡沫混凝土系列产品以水泥、粉煤灰为原料，符合国家提倡绿色环保型建筑节能材料的标准和要求。
The seamless steel tube production is characterized by complicated procedures, various sorts, non-unified standards, small batch and high requirements for raw material quality.
无缝钢管生产的特点是工序复杂、多品种、多规格、小批量、对原材料质量要求较高。
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