盐酸法生产饲料级磷酸氢钙的新工艺

A new process for producing feed-grade calcium hydrogen phosphate by using chlorhydric acid

对我国化工企业现行的盐酸法饲料级磷酸氢钙生产工艺的现状进行了介绍与分析,指出了存在的问题,提出了一种新的生产工艺,即去渣一段中和法。工业试验结果表明,新工艺能使磷矿石中磷的利用率由现有工艺的近60%提高到85%以上,脱氟液中磷氟质量比由240左右提高到300以上,产品收率提高20%以上,产品质量也大大提升,并显著降低了原料消耗及生产成本。

The conventional process to produce feed-grade calcium hydrogen phosphate with chlorhydric acid method in China is introduced and analyzed,and some problems are pointed out.A new production process is proposed,in which the acid sludge is removed and the pickling liquor is neutralized once with lime milk after defluorination.The results indicate that the new production process can increase the utilization of phosphorous from 60% to over 85%,the mass ratio of P_2O_5 and F in defluorinating liquor from 240 to over 300,and the yield by over 20%.With the new production process,the quality of feed-grade calcium hydrogen phosphate is improved,the raw material consumption and the cost are decreased too.