Kemira Oy

Kemira Chemicals Oy

Jarmo Aaltonen

Anders Weckman

Esko T Kari

Elias U Suokas

Paula Ylinen

Sakari Riihim&auml;ki

Process for production of phosphoric acid by crystallization of phosphoric acid hemihydrate

The invention relates to a process for the separation of phosphate minerals from a phosphate ore, especially from a phosphate-carbonate ore, by using in the flotation as the reagent selective for phosphate mineral a compound having the general formula I, or a salt or amide ##STR1## of the same, in which formula X is --CH--CH--, ##STR2## Y is ##STR3## n is a number 0-40, in which case, when n is greater than 1, groups ##STR4## may be the same or different, m is 0 or 1, B is --NRR.sup.2 or, when m and n are 0, ##STR5## R is H, R.sup.3 or ##STR6## and R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5, which may be the same or different, each stand for an aromatic, araliphatic or straight-chain or branched aliphatic hydrocarbon which contains 1-30 carbon atoms and which is possibly substituted by an oxygen or nitrogen function, with the exception of sulfosuccinic acid monolkyl amide according to Formula I. The invention also relates to such a reagent. ##STR7##

Process for the froth-flotation of a phosphate mineral, and a reagent

A process for the separation of phosphate minerals from a phosphate-carbonate ore, by flotation, wherein a phenol polymer such as a resol or a novolak, which improves the yield and selectivity of the phosphate minerals with respect to the carbonate minerals, is used in addition to a collector agent in the flotation.

Process for the froth-flotation of a phosphate mineral from a

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Siilinjarvi, Finland

Jarmo Aaltonen