PL5097B1 - The method of producing fertilizers. - Google Patents

Description

It is known from German patent documents Nos. 192 591 and 198 587 a method of treating naitunal phosphates containing aluminum and iron in the presence of magnesium chloride or in polyphenation with alkali metal idhols (Iairniailite maturity and artificial carnival lithium). Fraction of Gniewana Suihliimaejai in appropriate furnaces in order to produce aluminum chloride and iron chloride in order to simultaneously produce a citric acid-soluble phosphorus fertilizer, by means of a pre-sissier, it suiblimates the clay chloride, and then obtains the chloride of the clay and chlorine Some amounts of hydrochloric acid are present here and, as a remainder, indifferent magnesium phosphate in citrate. This method has not been used technically, however, so far it has been technically used, the precursor to the fact that the chlorine part of the magnesium chloride is not iso- it becomes displaced as hydrochloric acid, but is formed next to potassium chloride as background Magnesium and calcium chloride, having a detrimental effect on plants, which was also demonstrated by the climbing of agricultural experimental stations (Compare, for example, M. Popp, Oldenburg: Schroders-Phosphat-Kali, Seine Herstellung, Wirkungsweiise und Vorwen- dting ( Landw, Jahrbiieher 49, pp. 729/7%). It has now been found that citrate-soluble high-potassium phosphate or neutral phosphorus is obtained, gnesium at the circulation of natural phosphates and magnesium sulphate, chloride, magnesium and magnesium sulphate. with substances containing sulphate and magnesium chloride, or with mixtures of these compounds in the presence of water, until the mixture is weakly sintering, and with the addition of silicic acid to bind in 01 - calcium tosilicate such equivalent amounts of calcium contained in natural phosphates as it corresponds to the admixed amount of inagnesium oxide. With a sintering rate of about 900-1100 °, the magnesium-bound acid residue is completely stripped off completely, as sulfur dioxide, or hydrogen chloride, and depending on the added amount of magnesium, magnesium-calcium phosphate Mg C (POJ2. Or also inert magnesium phosphate Mg3 (POJ2 *) When using magnesium sludges containing sulphates or alkali metal chloride or various magnesium salts from alkali metals (sulphates or chlorides), it is also possible to obtain, containing alkali metal calcium-magnesium phosphates or magnesium phosphates; for example, when using magnesium salts containing potassium phosphate, K2Mg Ca is obtained (POJ2 or K2Mg2 (POJ2. When using potassium-magnesium sulfate, it can be imagined as follows: C <* s {POJ2 + MgSO ± + K2SO, + SiO2 = = K2Mg \ Ca (P0J2 + 2CaO. SiO2 + 2 SO3. Small amounts of iron and aluminum compounds, k These may exist here, do not convert to iron and aluminum chlorides by the use of magnesium chloride, while iron and aluminum may partially absorb the action of silicic acid to form calcium alum or, possibly, iron Calcium phosphates contain sufficient amounts of silicic acid or silicates to form calcium ortosilicate, they need to be processed, if appropriate, only with the addition of magnesium salts or alkali compounds. nezoWych. Otherwise, sufficient amounts of silicic acid or silicates should be added. It is evident that it is also possible that the natural phosphates contain more silicic acid than is needed to carry out the process in the prescribed manner. In this case, it is necessary (add enough wax to bind the entire excess of silicic acid in the form of calcium orthosilicate. The required ratio of the content of lime and silicic acid can also be achieved by mixing mineral phosphates, containing a lot of silicic acid and phosphates with each other). As already mentioned above, depending on the combinations used, magnesium, sulfur dioxide and hydrogen chloride are produced in the present process, which are processed in a known manner to produce phosphoric or hydrochloric acid. The present method is furthermore the generation of a steam-containing atmosphere in which the mixture of processed natural phosphates takes place and sintering. This atmospheric humidity can be obtained most simply by introducing steam into the furnace chamber or by brightening the hydrogen-containing fuel. as it happens, for example, with good effect when heated with water gas or team, or, where appropriate, by a combination of both methods. The present invention makes it possible to achieve a great deal of progress both technically and economically. It enables the production of a very important phosphorus fertilizer, containing potassium and magnesium, with the use of cheap natural products, for example natural phosphates, which are low in value due to the high content of silicic acid and, in this case, the low-valent waste material found in the industry. Example 1 100 parts of North African-African phosphate, containing 39.7% - 2 -P206 and 47.0% CaO, bound to phosphoric acid, 5.61% CaO not bound to phosphoric acid and 0.56% SiO2 zomicszamó (carefully with 209 parts of magnesium sulfate, corresponding to 34 parts of AfgO and 27.7 parts of quartz sand. This mixture was annealed at a temperature of about 1100 ° C while passing water vapor. The product contained: 25.37% phosphoric acid, a total of 21.77% phosphoric acid soluble in citrate (in ammoniacal solution of ammonium citrate according to Petermainn's method), i.e. more than 86% of the total amount of phosphonic acid can be combined. Sulfuric acid was removed from the product practically completely, because the selected material contained only 0.62% of SO3. Example II. 100 parts of this North African natural phosphate alone was mixed perfectly with 96 parts of commercial potassium magnesium sulfate, corresponding to 34 parts magnesium sulphate and 49 parts potassium sulphate and 19 parts quartz sand. The mixture was annealed at a temperature of slightly 1000 ° C, releasing steam. The reflux product contained: 27.57% phosphoric acid, in total, 26.81% phosphorous acid dissolving in citrate (in the ammonium citrate solution of ammonium citrate according to Petermamin), therefore the total amount of phosphoric acid was dissolved 97.25%. 18.40% K20. The product contained only 0.37% S03. PL

Claims (5)

Patent claims. 1. A method for the production of phosphorus fertilizers, characterized by mixing phosphorites with sulphateimai or maygitosomic chlorides, if necessary adding lime and silicic acid or phosphates containing a lot of silicic acid at the same time, and the mixture subjected to annealing in the presence of water vapor at a temperature of about 900 ° and above, the escaping solids dioxide, or the escaping hydrochloric acid, are collected back in a known manner. 2. The method according to claim The invention as claimed in claim 1, characterized in that the phosphorites used as the starting product are supplemented with such amounts of magnesium salts, sulphates or chlorides, or a mixture of both, and such amounts of lime and fasforic acid, or natural phosphates, containing the latter substances as admixtures to in the mixture subjected to annealing, it fell to 1 part. wt. P2Ob, depending on what you want to obtain magnesium phosphate, one, two or three grams of magnesium oxide yeast, and daley is added to the mixture of so much silica flower that, in addition to magnesium potassium phosphate, it is possible to form an even inert magnesium phosphate. calcium silicate. 3. The method according to p. 1 and 2, characterized by the fact that instead of magnesium sulfate or magnesium chloride or mixtures thereof, magnesium salts are used which contain alkali metal sulfate or chloride. 4.; The method according to claim 1, 2 and 3, the change is that phosphates containing iron and aluminum are used instead of the phosphates rich in silicic acid. 5. The method according to p. A fuel containing hydrogen is used for the annealing, which provides the necessary water to carry out the process in whole or in part. Rhenania V e r e i n Chemischer Fabriken Aktie n-G esellschaft. Deputy: M. Brokman, patent attorney. Printed by L. Boguslawski, Warsaw.jBiBL \ 0 Vol. ¦¦¦-¦¦- ¦ •! "¦ -.V PL