SU597663A1

SU597663A1 - Method of obtaining dicalcium phosphate

Info

Publication number: SU597663A1
Application number: SU752140282A
Authority: SU
Inventors: Николай Тимофеевич Мороз; Владимир Иванович Корецкий; Нина Васильевна Бударина; Василий Васильевич Карацюба
Original assignee: Славянское Производственное Объединение "Химпром"
Priority date: 1975-06-03
Filing date: 1975-06-03
Publication date: 1978-03-15

Description

1one

Изобретение относитс к способам получени фосфатов кальци н может быть использовано в химической промышленности в производстве кормовых и технических дикальцийфосфатов.The invention relates to methods for producing calcium phosphates and can be used in the chemical industry in the production of feed and technical dicalcium phosphates.

Известен способ получени дикалыхийфосфата путем смешени концентрированной ортофосфорной кислоты с мелом или извест н ком с пос едукнцкм выдерживанием смеси в течение 1,5-2 ч и измельчением продукта ij. Недостатком данного способа получени дикальиийфосфата вл етс длительность процесса преципитировани продукта.A known method for producing dihydrochloride phosphate is by mixing concentrated phosphoric acid with chalk or lime with a mixture kept for 1.5-2 hours and grinding the product ij. The disadvantage of this method of producing dicalium phosphate is the duration of the product precipitation process.

Наиболее близким к открываемому изобретению по технической сущности вл етс способ получени дикальиийфосфата, заключающийс в том, что размолотый мел Или известн к обрабатывают концентрированной фосфорной кислотой в присутствии ретура дикальцийфосфата с последующим выдерживанием смеси, сушкой и измельчением продукта 2, Недостатком указанного способа вл етс также длительность процесса дозревани продукта (1,5 ч) и The closest to the inventive invention to the technical essence is the method of obtaining dicalium phosphate, which means that ground chalk or lime is treated with concentrated phosphoric acid in the presence of a dicalcium phosphate retur followed by curing the mixture, drying and grinding the product 2, the disadvantage of this method is also the duration the process of maturation of the product (1.5 hours) and

наличие монокальш41фосфата в готовом продукте (4,1%).the presence of mono-potassium phosphate in the finished product (4.1%).

С целью ускорени процесса и уменьшени содержани примесей монокальйийфосфата в продукте предлагают способ, отличающийс от известного тем, что в смесь дополнительно ввод т водную суспензию дикальцийфосфата, пр этом ее концентраци 35О-85О, предпочтительно 65О75О г/л, а температура 45-9О, предпочти тельно 55-6О°С.In order to speed up the process and reduce the amount of impurities of monocarium phosphate in the product, a method is proposed that differs from the well-known fact that an aqueous suspension of dicalcium phosphate is added to the mixture, and its concentration is 35 O-85 O, preferably 65 O 75 O g / l, and the temperature is 45-9 O, preferably 55-6 ° C.

Claims

Example 1. Kibpot phosphorus (concentration 73%) - in an amount of 10 to 6 kg / h enters the mixer, where 990 kg / h of chalk react. A retur is fed to the mixer in the amount of 89OO kg / h and the suspension of dicalcium phosphate (concentration 350 kg / m in the amount of 254 kg / h. The maturation of the product is carried out for 2O minutes. After the drying and grinding stage has passed, the finished product in the amount of 10772 kg / h comes to the warehouse of finished products. The content of monocalcium phosphate in the product is 2.1%. At 2. 2. phosphoric acid (concentration 73%) in an amount of 1OOOO kg / h enters the mixer, where it reacts with 99OO kg / h of chalk. B is 89OO kg / h and the suspension of dicalium phosphate (concentration 85 O kg / m in the amount of 8OOOOO kg / h, the ripening of the product is carried out within 2O minutes, the drying and grinding stage has been completed, the finished product in the amount of 1248 kg / h is delivered to the finished product storage.The content of monocalcium phosphate is missing The formula of the invention 1. Method of producing dicalcium phosphate by treatment ground chalk or lime with concentrated phosphoric acid in the presence of a retour of dicalcium phosphate followed by holding the mixture, drying and grinding the product, characterized in that, in order to accelerate the process and reduce holding the impurities of monocalcium phosphate in the product, an aqueous suspension of dicalcium phosphate is added to the mixture. 2. A method according to claim 1, characterized in that the concentration of the aqueous suspension of dicalcium phosphate is 35 O-85 O, preferably 65 O-75 O g / l, the temperature is 45-9 O, preferably 55-6 O C. Sources of information, taken into account during the examination: 1. Author's certificate of the USSR No. 251555, cl. C Ov 25/32, 1969.

2. Authors certificate of the USSR N 169389, cl. From 01 to 25/32, 1965.