Kemira Oy

Kemira Chemicals Oy

Kemira Growhow Oy

Yara Suomi Oy

Anders Weckman

Jarmo Aaltonen

Paula Ylinen

Juhani Poukari

Thomas Ahlnas

Esko T Kari

Eija Saarikko

Janne Karonen

Sakari Riihim&auml;ki

Stephan Vermeulen

Aija- R Halinen

The invention relates to a method for preparing a suspension containing phosphate stepwise directly from raw materials, from phosphoric acid of fertilizer quality, a base and organic additives. In accordance with the method, the phosphoric acid is preneutralised with the base, the organic additives are added, nucleation is controlled and phosphate salts are cooling crystallised in order to form a suspension. The phosphate suspension prepared with the method of the invention is applicable to seed coating.

Method for preparing a suspension containing phosphate

A method for manufacturing a solid product containing nitrogen and phosphor, particular a solid ammonium phosphate and/or urea ammonium phosphate product, in which method the solution containing urea and phosphoric acid is heated. Water then evaporates from the solution and the urea in the solution decomposes into ammonia and carbon dioxide. The carbon dioxide exits the reactor together with water vapor; the generated ammonia neutralizes the phosphoric acid. A suspension containing ammonium phosphate and/or urea ammonium phosphate is obtained, which is solidified, dried, crushed, ground and/or granulated. The end product as such can be used as a fertilizer or it can be used as part of a mixed fertilizer.

Method for treating fertilizer process solutions

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

A controllably active fertilizing preparation in the form of an emulsion-suspension or an emulsion is comprised of:

Fertilizing preparation improving the extraction of phosphorus for plants

The invention relates to a method of separating phosphatic minerals from phosphate ores, especially from phosphate carbonate ores by flotation in the presence of a collector, which comprises a compound having the general formula

Process for the flotation of phosphate mineral and an agent to be used

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

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Espoo, Finland

Anders Weckman