SU967947A1

SU967947A1 - Process for recovering phosphorus from slurry

Info

Publication number: SU967947A1
Application number: SU802918798A
Authority: SU
Inventors: Вадим Андреевич Ершов; Андрей Петрович Мельник; Александр Джарасович Кипчакбаев; Тлеубай Муканович Альжанов; Вадим Искакович Баймуратов; Юрий Васильевич Шкарупа; Валерий Николаевич Конев; Владимир Николаевич Белов; Борис Иосифович Бортничук; Ренат Ханифович Тынчеров
Original assignee: Чимкентское Производственное Объединение "Фосфор" Им.50-Летия Октябрьской Революции; Казахский Научно-Исследовательский И Проектный Институт Фосфорной Промышленности
Priority date: 1980-05-05
Filing date: 1980-05-05
Publication date: 1982-10-23

Description

(54; СПОСОБ ИЗВЛЕЧЕНИЯ ФОСФОРА ИЗ ШЛАМЛ(54; METHOD FOR EXTRACTING PHOSPHORUS FROM SLAML

Изобретение относитс к технологии получени фосфора, в частности к технологии переработки шлама,, образующегос при производстве фосфора.This invention relates to a process for the production of phosphorus, in particular, to a technology for processing sludge formed during the production of phosphorus.

Известен способ извлечени фосфора из шлама, включающий его брикетирование до содержани воды в брикетах не более 20%, загрузку в электропечь вместе с исходны сырьем и коксом и восстановление при 14001700°С 1.A known method for the extraction of phosphorus from sludge, including its briquetting to a water content of briquettes of not more than 20%, loading into an electric furnace together with raw materials and coke and reduction at 14001700 ° C 1.

Наиболее близким к изобретению по технической сущности и достигаемому результату вл етс способ извлечени фосфора из шлама путем удалени из него воды при 100-280 С до остаточного содержани не более 8%, смешени шлама с фосфором до соотношени 25:75, сушки шлама в верхней зоне электропечи при 300-500°С, электротермической обработки шлама совместно с исходной рудой в присутствиии кокса при 1400-1700 с с восстановлением фосфора и его конденсации из печных газов LS.The closest to the invention to the technical essence and the achieved result is the method of extracting phosphorus from the sludge by removing water from it at 100-280 ° C to a residual content of not more than 8%, mixing the sludge with phosphorus to a ratio of 25:75, drying the sludge in the upper zone electric furnaces at 300-500 ° С, electrothermal processing of the sludge together with the original ore in the presence of coke at 1400-1700 s with the reduction of phosphorus and its condensation from furnace gases LS.

Недостаток известных способов большие потери фосфора (3-12%).The lack of known methods of large losses of phosphorus (3-12%).

Целью изобретени вл етс снижение потерь фосфора.The aim of the invention is to reduce the loss of phosphorus.

Поставленна .цель достигаетс электротермической обработкой непосредственно исходного шлама в присутствии кокса при 700-1300 С. При этом соотношение шлама и кокса поддерживают . равны 2-6:1.The target is achieved by electrothermal treatment of the initial sludge directly in the presence of coke at 700-1300 C. The ratio of sludge and coke is maintained. equal to 2-6: 1.

Совокупность признаков позвол ет снизить потери фосфора из-за его окислени и вторичного шламообразо10 вани до 0,3%.The combination of features allows reducing losses of phosphorus due to its oxidation and secondary sludge formation to 0.3%.

П р и м е р 1. В цилиндрическую электропечь, содержащую в верхней части течку дл подачи кокса, снабженную выходным патрубком дл отво15 да печного фосфорсодержащего газа, летку в нижней части печи дл вывода шлака, вводное устройство дл подачи фосфорсодержащего отхода, подают фосфорный шлам, состо щий PRI me R 1. In a cylindrical electric furnace containing a coke supply chute in the upper part, equipped with an outlet nozzle for removing phosphorus-containing furnace gas, a tap in the lower part of the slag furnace, an input device for supplying phosphorus-containing waste, is fed phosphoric sludge consisting

20 из 62%iфосфора, 24% воды и 14% твердых примесей, следующего химического состава, %: Piz.05 32,9; СаО 13,6; МдО 3,4; F 1,84; 2,5; Fe.0,, 0,6; Kj.O 11,1; 25 2,6} остальное 5,6.20 of 62% iphosphorus, 24% water and 14% solids, the following chemical composition,%: Piz.05 32.9; CaO 13.6; MDO 3.4; F 1.84; 2.5; Fe.0 ,, 0.6; Kj.O 11.1; 25 2.6} the rest 5.6.

Claims

The feed is carried out in the middle of the coke layer of a fraction of 10-25 mm with a ratio of phosphorus sludge to coke 4.0: 1. Pre-coke is heated to 1280C. Foeor vapor is condensed in a tubular condenser. The resulting phosphorus has a purity of 99.98%. The content of phosphorus oxides in the gas phase is absent (traces). The degree of extraction of phosphorus is 99.6%. The loss of phosphorus is 0.2%. Example2. In the electric furnace of Example 1, phosphorus sludge containing 10% by weight of phosphorus, 46% of water and 44% of solids is fed to the middle of the coke bed Fra | TsII 10–25 mm at a ratio of 2.0: 1 heated to 1250 ° C. The resulting phosphorus has a purity of 99.84%. The content of phosphorus compounds in the gas phase - traces. The degree of extraction of phosphorus is 96.5%. Loss of phosphorus 0.1%. PRI me R 3. In the electric furnace of Example 1, the temperature of the coke is maintained at a ratio of supplied phosphorus sludge to coke 2.0: The phosphorus obtained has a purity of 99.91%. The phosphorus recovery rate is 99.3%. The loss of phosphorus from the gas phase is 0.3%. Example4. The process is carried out analogously to example 1, but the coke temperature is maintained equal. The loss of phosphorus from the gas phase due to the oxidation of phosphorus is 10%. Example5. The process is conducted ana. according to Example 1, keeping the coke temperature at the same level. The loss of phosphorus is 12% due to the secondary 1 isamification. In addition, the purity of the product decreases and is due to the transition to the gas phase of alkali metal compounds. As can be seen from the examples, the optimum process temperature is 700-1300 ° C, when going beyond these limits, the loss of phosphorus increases dramatically. Thus, the proposed method allows to reduce phosphorus losses and simplify the method by eliminating the need for preliminary preparation of the sludge to the process. Claim 1. A method of extracting phosphorus from a sludge, including its electrothermal treatment in the presence of coke, and recovering phosphorus from it. In order to reduce phosphorus losses, the original sludge is subjected to electrothermal treatment at 700-1300s. 2. Method POP.1, characterized in that when reconstituting, the ratio of sludge and coke is maintained at 2-6: 1. Sources of information taken into account in the examination 1. US patent 2267077, cl. 23-223, published 1941.

2. US Patent 3,743,700, cl. 423-322, publ. 1973.