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磷矿中氧化钙含量偏高将影响 :硝酸消耗 ;四水硝酸钙的结晶与过滤负荷 ;中和料浆粘度与产品质量。中低品位磷矿的使用更增加了生产合格产品的难度。提出分离四水硝酸钙后的母液加入 H2 SO4 或 (NH4 ) 2 SO4 进一步除去母液中残钙 ,可使母液中钙含量由 3.4 %降到 0 .35 %以下 ,中和器中料浆粘度可降到 0 .0 4～ 0 .0 8Pa· s,料浆流动性很好 ,产品中磷的水溶率可达 88%～ 90 % ,并提高了硝酸磷肥生产对磷矿的适应能力。
High levels of calcium oxide in phosphate rock will affect: nitric acid consumption; crystallization of calcium nitrate tetrahydrate and filtration load; neutralizing slurry viscosity and product quality. The use of low-grade phosphate rock has increased the difficulty of producing qualified products. Proposed separation of calcium nitrate tetrahydrate mother liquor by adding H2 SO4 or (NH4) 2 SO4 to further remove residual calcium in the mother liquor, the mother liquor can be reduced from 3.4% of calcium content to 0.35%, the viscosity of the slurry in the neutralizer Down to 0 .0 4 ~ 0. 0 8Pa · s, the fluidity of the slurry is very good, the product of phosphorus in the water-soluble rate of up to 88% to 90%, and improve the nitrophosphate production of phosphate rock adaptability.