Purification of phosphoric acid
Номер патента: CA1112020A
Опубликовано: 10-11-1981
Автор(ы): Harold E. Mills
Принадлежит: Occidental Chemical Corp
Опубликовано: 10-11-1981
Автор(ы): Harold E. Mills
Принадлежит: Occidental Chemical Corp
Реферат: ABSTRACT Metal ion impurities are removed from phosphoric acid by adding to the acid a precipitant comprising ions Or calcium and fluorine to cause precipitation Or, for example, a magnesium-containing precipitate. A preferred precipitant is one containing calcium fluoride, such as the sludge obtained by treating pond water from a phosphoric acid plant with a calcium-containing compound. Preferably, the soluble sulphate content of the phosphoric acid is maintained at at least about 2 by weight. An animal feed can be prepared from the precipitate by combining the precipitate with phosphate rock, water, and a sodium-containing compound, and then calcining the combination.
Purification of wet-process phosphoric acid with methanol and ammonia
Номер патента: US3975178A. Автор: John F. McCullough,Leland L. Frederick. Владелец: Tennesse Valley Authority (ATV). Дата публикации: 1976-08-17.