DD148876A4 - METHOD FOR THE PRODUCTION OF A CROPPED, OPTIONALLY CALCULATED MAGNESIUM FUSES - Google Patents

Abstract

The invention relates to a process for the preparation of a gekoernten, freilagerfaehigen lime-magnesium fertilizer according to patent 139 335, which is freilagerfaehig under all weather conditions and which is characterized by a good landfill effect. The known starting materials, a verhaldetes material which has proportions of MgO and K & ind 2! O, added in solid or geloester form. According to the invention, the joint comminution and / or combination takes place without pretreatment of the starting materials in known rolling mills. Cation incorporation of the Mg ions, K ions and Ca ions into the clay minerals results in the combination of the precursors with a gekoerter, free-standing fertilizer with high soil physical and biological characteristics, which is particularly suitable for acid soils and for soils with magnesium deficiency is.

Description

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Process for the preparation of a granular, free-standing lime- scale lime-scale at te 1 s

Field of application of the invention

The invention relates to a process for the production of a granular lime-magnesium fertilizer which is stable for up to 12 months under all weathering conditions. <br /><br/><br/><br/> KaIk-magnesium fertilizers are indispensable for maintaining soil fertility and for optimal plant growth -Magnesium fertilizer find raw materials and waste products use, which "so far in the industry could not or only partially be used _e

Characteristic of the known technical solutions

According to main patent 139 335> the production of free-standing lime-magnesium fertilizers by the common crushing einos soft, clay-silty, dolomitic Mergels with one or more industrial waste products with the main components Ca (OH) ₂ and CaO, the marl a water content from ten to twenty percent. In this method according to the invention, incorporation of the calcium ions present in the moist mixture into the lattices of the clay minerals results in a structural change of the starting materials, and a granular, spreadable product is formed. This fertilizer can be improved in its structure by the addition of a further starting material with the constituents IvIgO and K ^ O. Bs is

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It is known that fine calcium carbonate is made into granules with the addition of hardening alkali metal or alkaline earth metal compounds, wherein zeolite or other salts containing magnesium as sulfate or chloride are added during the granulation (for example DE-OS 2014321).

The .Nachteil of this process is the high production costs and the use of high quality raw materials for the production of fertilizer granules, which are not free standing. The addition of kieserite or other salts containing magnesium as sulfate or chloride hereby only affect the fertilizer composition.

Aim of the invention

It is an object of the invention to provide agriculture a much needed granular lime-magnesium fertilizer with favorable plant biological characteristics at a low price. Using the method according to main patent 139 335 and using technical

proven device is a fertilizer to produce favorable economic conditions

It is also the objective to achieve an improvement of the MgO content and addition of KpO in the fertilizer by adding industrial waste materials to the known starting materials, and thus to increase the utility values of the fertilizer , supply only partially usable industrial waste material economically viable use, which at the same time accounts for costly Verhaldungsmaßnahmen.

presentation; the essence of the invention

The object of the invention is the development of a granular lime-magnesium fertilizer, which is up to 12 months free-standing, the effectiveness of the fertilizer not

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is significantly reduced. Known lime-magnesium fertilizers have the technical defect that they lose their throwing power when weathered wet.

Fertilizers produced in accordance with patent 139 335 have sufficient free-standing capacity. The proportion of MgO and K ₂ O in these fertilizers is, however, not sufficient for soils with very high magnesium deficiency

According to the present invention, a granular, storage-stable, calcium-magnesium fertilizer having an increased content of MgO and KpO is produced by forming a soft, loopy clay dolomitic marl with a water content> 10 percent with one or more industrial waste products containing the main constituents CaCOH) 1 and CaO is crushed together, and during crushing solid or dissolved in water kieserite is added o

Kieserite is produced in the production of potassium salts as a granular, dispersible product which has a strong hygroscopic reactivity. This reactivity influences the use of pure kieserite as a fertilizer negative. Most of the resulting kieserite is presently used. It is present here after a short time in crystalline form. »

In the process according to the invention, kieserite is added to the other starting materials in particulate or in water form, with mixing ratios of 8 parts marl: 1 part lime: 1 part kieserite up to 4 parts marl: 1 part lime: 5 parts kieserite economically viable,

In the common comminution of the starting materials, an intensive mixture occurs. The calcium, magnesium and potassium ions present in the mixture are incorporated into the lattices of the clay minerals, thus reducing the plasticity of the clay minerals.

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minerals is greatly reduced.

In the process according to the invention, these processes lead to a change in the structure of the starting materials and a granulated and spreadable lime-magnesium fertilizer with an increased proportion of MgO and an addition of K ₂ O which is transportable and free-standing is produced.

Ausfü hru ng s "be i sp ie le

example 1

4 parts of a soft, silty clay dolomitic (51.3% CaCO ₃ , 23 % MgCO ₃ ) with a moisture content of 16.4 % are mixed with 1 part of a waste product from hydration (38.2 % Ca (OH) ₂ , 34.1 % CaCO ₃ 5 20.2 % CaO) and comminuted with 5 parts solid Kieserits (18 % MgO, 8 % K ₂ O) in a rolling mill to a particle size smaller than 6.3 mm. 1.5 The resulting product is a granular, storage-stable lime-magnesium fertilizer with constituents of K ₂ O.

Example 2

8 parts of a soft, schluffig-clay, dolomitic Mergels (54.1 % CaCO ₃ , 22.5 % MgCO ₃ ) with a humidity of 10.8 % with 1 part of a waste product from the "Kalkhydatreatstellung" (38.2 % Ca (OH) ₂ , 34.1 % CaCO ₃ 5 20.2 % CaO) are comminuted to a particle size of less than 6.3 mm in a rolling mill During comminution, 1 part of kieserite dissolved in water (18 % MgO, 8 % K ₂ O) added The resulting product is a granular, free-standing lime-magnesium fertilizer with low constituents of K ₀ O ₀

Claims (1)

Claim 2 I 3 4 4 5 * "^" A process for the preparation of a granular free-standing Zalk-Iiagnesium fertilizer according to patent 139 335, in which a soft, schlufffig-clay, dolomitic marl with one or more industrial waste products with the main components CaCOH) ^ and CaO comminuted, characterized in that when crushing solid or dissolved in water egg serite in a mixing ratio of 8 parts marl: 1 part lime: 1 part kieserite up to 4 parts of marl: 1 part of lime: 5 parts of egg yolk, based on the dry matter, is added.