渣酸制饲料级磷酸氢钙工艺研究

doi:10.19964/j.issn.1006-4990.2021-0372

Abstract

Abstract:

In order to solve the problem of difficult utilization of residue acid of wet process phosphoric acid,a new process for preparation of feed grade dicalcium phosphate from residue acid was put forward.The process parameters were optimized based on the ratio of phosphorus to fluorine of the product.The experimental results showed that when the pH of the defluorination process was 2.8,the ratio of phosphorus to fluorine of the solution was more than 250,and the impurity ions in the sludge acid were enriched in the white fertilizer to achieve the purpose of purification of impurity ions,and made the element content in the solution meet the requirements of feed grade dicalcium phosphate.The defluorinated acid solution was neutralized with lime milk to obtain dicalcium phosphate products with w（F） lower than 1.8×10^-3,the ratio of phosphorus to fluorine more than 300,and low content of chromium,arsenic,lead and other impurities,which met the GB/T 22549—2017 “feed additive dicalcium phosphate”.

Key words: feed grade dicalcium phosphate, sludge acid, defluorination

CLC Number:

TQ132.32

WANG Bo,ZHOU Zhixin,XU Dehua,YANG Xiushan,ZHANG Zhiye,ZHONG Yanjun,HE Binbin,JIANG Wei. Study on preparation process of feed grade DCP from sludge acid[J]. Inorganic Chemicals Industry, 2022, 54(4): 141-144.

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References 19

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项目	w（P₂O₅）/ %	w（CaO）/ %	w（F）/ %	w（Cr）/ 10^-6	w（As）/ 10^-6	w（Pb）/ 10^-6
GB/T 22549— 2017	≥37.8	≥28	≤0.18	≤30	≤20	≤30
中和产品	38.67	31.54	0.12	25	15	2

项目		消耗定额	单价/元	金额/元
原材料	渣酸（折100% P₂O₅）	0.54 t	2 000	1 080
	碳酸钙（98%）	0.49 t	150	73.5
	石灰（90%）	0.19 t	450	85.5
	包装袋（50 kg）	20.0条	2	40
燃料和动力	电	84 kW·h	0.5	42
燃料和动力	煤（26 370.87 kJ）	0.07 t	1 000	70
其他（副产品回收等）	粗肥（19%）	-0.82 t	50	-41
工资和福利费用				60
制造费用				20
合计				1 430

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation process of feed grade DCP from sludge acid

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