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把水玻璃砂的发展分为三个阶段 ,即普通钠水玻璃阶段、变性水玻璃砂阶段和旧砂的化学再生阶段 ,并对各个阶段的特点与不足作了详细分析
The development of sodium silicate sand is divided into three stages, that is, ordinary sodium water glass stage, denatured sodium silicate sand stage and old sand chemical regeneration stage, and the characteristics of each stage and deficiencies were analyzed in detail