SU569533A1

SU569533A1 - Method of preparing extractive phosphoric acid

Info

Publication number: SU569533A1
Application number: SU7502118482A
Authority: SU
Inventors: Макс Ефимович Позин; Ренат Юрьевич Зинюк; Борис Давидович Гуллер; Всеволод Кузьмич Гаркун; Лев Николаевич Сыркин; Виктор Александрович Тарасов; Леонид Петрович Шляпинтох
Original assignee: Ленинградский Ордена Трудового Красного Знамени Технологический Институт Им.Ленсовета
Priority date: 1975-03-28
Filing date: 1975-03-28
Publication date: 1977-08-25

Description

(54) СПОСОБ ПОЛУЧЕНИЯ ЭКСТРАКЦИОННОЙ ФОСФОРНОЙ КИСЛОТЫ(54) METHOD FOR OBTAINING EXTRACTIONPHOSPHIC ACID

Изобретение относитс jc способу получени экстракционной фосфорной кислоты, котора используетс при производстве минеральных удобрений.The invention relates to a jc method for producing phosphoric acid that is used in the production of mineral fertilizers.

Известен способ получени экстракдио ной фосфорной кислоты путем сернокислот ного разложени фосфоритов.A known method for producing extracidic phosphoric acid by sulfuric acid decomposition of phosphates.

Фосфориты, содержащие карбонат, дл удалени С Ojпредварительно прокалйвавэт в циклонной печи или в псевдоожиженном слое при 649-1О93°С в течение 20-30 мин, удал в газовую фазу около половины содержащейс в сырье углекислоты,Carbonate-containing phosphorites, in order to remove C Oj, pre-prokaliwat in a cyclone furnace or in a fluidized bed at 649-1О93 ° С for 20-30 minutes, removing about half of the carbon dioxide in the gas phase,

Дл этого способа:характерны высокий расход топлива и продолжительность продеоica i;i. .:For this method: high fuel consumption and duration of production i; i. .:

Известен также способ получени экст ракционной фосфорной кислоты, включающий предварительную обработку карбонатеодej жащих природных фосфатов неорганической кислотой, в частности фосфорной кислотой, с концентрацией 15-18% с посл&;дующим сорнокислотным разложением фосфоритов .There is also known a method for producing extracorporeal phosphoric acid, which includes pretreatment of carbonatetoidej of natural phosphates with inorganic acid, in particular phosphoric acid, with a concentration of 15–18% with subsequent amphobic decomposition of phosphorites.

Однако при осуществлении этого способа Наблюдаетс значительное вспенивание мао;сы на стадии декарбонизации фосфорита при его загрузке в реактор.However, when implementing this method, a significant churning of mao is observed; at the stage of decarbonization of phosphorite when it is loaded into the reactor.

Во избежание выброса пены на этой стадай необходимо, чтобы реакционный объем (был не менее 2м при расходе фосфорита 1 т/час f 2.In order to avoid foam release on this flock, it is necessary that the reaction volume (not less than 2 m at a phosphate consumption of 1 ton / hour f 2.

С целью уменьшени ценообразовани |и интенсификации процесса получени кислоты , предлагаетс в качестве неорганической кислоты при предварительной обработке фосфорита использовать 5О-95%-ную серную кислоту, предпочтительно 75%-ную, или фоо форную кислоту с концентрацией 50-80%, предпочтительно 55-70%, или смесь этих кислот с суммарной концентрацией 50-90%, предпочтительно 6О-80%, вз тых в количестве lOr.35%, предпочтительно 15-25%, от веса фосфорита.In order to reduce pricing and intensify the process of producing an acid, it is proposed to use 5O-95% sulfuric acid, preferably 75% or phosphoric acid with a concentration of 50-80%, preferably 55-%, as an inorganic acid. 70%, or a mixture of these acids with a total concentration of 50-90%, preferably 6O-80%, taken in the amount of lOr.35%, preferably 15-25%, by weight of phosphate.

Claims

At the indicated ratios of reagents, decarbonization occurs in the bulk charge, which excludes the formation of a stable foam. Accordingly, the reaction volume of the decarbonisation unit is reduced by 5-8 times, and the total productivity of workshops of extra phosphoric acid, using carbonate and phosphate, increases by 10%. Example 1. 100 kg of soyote phosphate,. / O-. , f-8.2; , 4; CaO-37.4 is treated with mixing 21 kg of ern acid with a concentrate of 65%. The degree of destruction of carbonates reaches 55% after 5 minutes at an initial acid temperature of 2 0 ° C. The resulting mass, containing 3.1% of CO2, is fed into the reactor, where 102 kg of 65% i are treated (oro of sulfuric acid solution precipitating the dihydrate Calcium sulphate, after which the resulting suspension is processed by known methods. Example 2. 100 kg of phosphorite acid,%; P20j-22, l%; C02-9.3; M | O-3.9; C &0-63; , 2 is mixed with 34 kg of hot (60 s) extraction phosphoric acid containing 6 O%. After 4 min, the content of CO in the mixture is 4.9%. The degree of decarbonization 34%. The resulting mixture is treated in an extractor with 135 kg of a 609% sulfuric acid solution, after which the resulting suspension is processed by known methods. EXAMPLE 3. YuO kg of Ta-aas phosphate of Example 2, is mixed for 15 minutes with a mixture of 1O kg of sulfuric acid with a concentration of 92% and 10 kg of extracellular phosphoric acid with a concentration of 45%. The initial temperature TjTpa of the mixture is 60 C. At the same time, 56% of the total Od contained in phosphate is released into the gas phase. The resulting friable batch containing 3.5% SO is sent to an extractor, where it is mixed with 120 kg of sulfuric acid with a concentration of 60%, after which the resulting suspension is processed by known cnocibs. In examples 1-3, decarby Phosphorr is introduced into the reactor at a rate of 2 kg / h. The height of the foam layer in the extractors in examples 1-3 is 5 times less than when decomposing phosphorite, which did not pass through the pre-decarbonization stage I, and 3 times less than in the decarbonation reactor, during the process adopted for the prototype. The method of obtaining extractive phosphoric acid by decarbonizing carbonate-containing natural phosphates with an inorganic acid followed by the sulfuric acid decomposition of partially decarbonized phosphaus, which distinguishes -. so that, in order to reduce the penny of education and intensify the process. For example, sulfuric acid with a concentration of 50-95%, preferably 75%, or phosphoric acid with a concentration of 5O-80%, preferably 55-70%, or a mixture of sulfuric and phosphoric acids with a total concentration of acids 50-90 are used as inorganic acid. %, preferably 60-80%, taken in an amount of 10-35%, preferably by weight of phosphate. Sources of information taken into account in the examination: I l.Chem, End .., 58, № Ю, 91, 1962.ё

2. For application number 2019116/26, 16.05.74, according to which the decision was made to issue av. torsky certificate.