DE1592643A1 - Thinning preparations and processes for their manufacture - Google Patents

Description

The present invention relates to improved phosphate ore preparations with advantageous properties,

In certain soil and climatic conditions it is possible to use finely ground phosphate ore as fertilizer «Jedooh tends powdered phosphate ore as well as other fertilizer to sit down, especially when it is stored in heaps, and exposure to atmospheric moisture. Now it has surprisingly been found that powdered Phosphatera duroh Bs-

with! a wesssrabweiaendsn (

will

the a1

and not

hydrophobic) substance free-

if te is in heap iue $ «ie $ te,

_BATH ORIGINAL

Substance or a mixture of such water-repellent substances is treated and preferably coated. to

. ν ■■ '· ■' - ■ "■ ■ ■

suitable phosphate ores include those from Gafsa, Christmas Island, Nauru, Morocco, Florida and similar phosphate ores. It is advantageous if the phosphate ore has a particle size of not more than 0.5 mm and a specific surface area of at least 500 cm / g.

As a water-repellent substance, a long-chain fatty acid with preferably more than 10, preferably 16-2o carbon atoms, a water-insoluble salt thereof, a long-chain aliphatic amine with preferably 16-2o carbon atoms and or a silicone are woven. The mixture of water-repellent substances may, for example, be two or more Fatty acid salts or consist of one or more long-chain fatty acids with one or more fatty acid salts. Suitable long chain fatty acids include, for example, stearic acid, palmitic acid, lauric acid and oleic acid. Examples of fatty acid salts are calcium, aluminum, magnesium and zinc stearate, calcium and tin palmitate, aluminum rioinoleate and aluminum oleate. Sin is a suitable long chain aliphatic amine. e.g. stearylamine. To the Usable silicones include, for example, an alkyl silicone,

like methyltrichloroilane ·!

Surprisingly, it was found that only relatively low Amounts of water repellent Subetan «to effectively treat a given amount of powdered Phosphaterzta

necessary

009884/1721

BATH ORIGINAL

' are. A preferred embodiment of the invention is a preparation of powdered phosphate rock with a coating of 0.05 to 0.5 wt .- ^, preferably 0.1 to 0.2 wt -. $ Water repellent> substance based on the weight of the phosphate ore consists. Of course, larger amounts can also be used if necessary.

The present invention also relates to a method of making an improved fertilizer preparation, in which powdered Phosphate ore is treated with a water-repellent substance. The powdered phosphate ore is preferably one subjected to such a treatment as to coat the ore particles with a water-repellent substance.

The treatment of the powdered phosphate ore with a water repellent Substance can be done in a number of ways. The water repellent substance can be applied to the powdered one, for example Ore can be sprayed as a solution or suspension in a volatile organic solvent, after which the solvent evaporated and recovered. With a preferred one

For example, in a method, the ore and the water-repellent substance / during grinding are brought into intimate contact, a coating of water-repellent substance being obtained on the pulverized ore. For the specific implementation of this process, the. water-repellent substance in the form of flakes or pearls or in the molten state become the partially ground phosphate ore
give / and then the two materials are ground together.

009884/172 1 _ßAD ORIGINAL

It has also been found that in order to produce a good fatty acid coating on the phosphate ore is best ground at a few degrees above the melting point of the fatty acid.

Among the preferably recycled devices with which the phosphate ore and the water-repellent substance in Contacted and milled include rotary mixers, screw mixers, or ribbon mixers Ball mills, tube mills, pendulum mills, rocking mills, and other types of mills for grinding ore.

When using long-chain, water-insoluble Fatty acid salts, it is advantageous to use the fatty acid salt * to use in finely ground condition and there is enough to bring into contact with the phosphate ore. The fatty acid salt is preferably up to a size with a specific surface of 2o ooo to 15o ooo cm / g ground · In this way an 'effective mixing of the small amounts of fatty acid salt can be achieved with the relatively large amounts of ore.

When powdered phosphate ore is stored in piles outdoors, it is the most economical storage method represents, the pulverized ore loses its free-flowing property. It has been found that invention " according to coated with a water-repellent substance

powdered phosphate ore when stored outdoors this 009884/1721

BATH ORIGINAL

Disadvantage does not have, but that one over the heap forms an impenetrable surface layer under which the powdered ore remains free flowing. In this way, the pulverized ore is still in use after it has been stored

/ and easy to use as a fertilizer in the free flowing state.

The invention is therefore also directed to a method of storing powdered phosphate ore in the open air, in which an ore heap is formed, of which at least the outermost layer with a water-repellent substance, preferably with a long chain fatty acid, or a salt thereof, has been coated, creating an impermeable layer over the heap is formed. The whole heap can be made from the powdered phosphate ore coated with a water-repellent substance consist or be a pile of powdered phosphate ore, that of a layer with a water-repellent substance coated, powdered phosphate ore.

The treated ore according to the invention can also be stored outdoors in specially treated bags for up to six months.
/

If the pulverized phosphate ore is to be used as a fertilizer, it can be mixed with other fertilizers such as potassium chloride and, for example, be in the form of a powder mixture of the ore and potassium chloride.

} The following examples serve to explain the invention.

006884/1721 ^BAD

'• 4 J-

Example. 1

2.27 kg of ground Gafsa phosphate ore (80 $> through a sieve (BSS100) with 0.152 mm mesh size) were mixed with 0.09 kg of calcium stearate with a specific surface area of 100,000 cm / g in a rotary mixer. The resulting mixture was again mixed with 43 kg of ground phosphate ore in a rotary mixer to give a product which, after one year of outdoor storage, retained its free flowing properties because a thin skin was formed on the surface of the heap and this skin did not let moisture through.

Ground phosphate ore (8o # through a BSS1oo test sieve) that was not treated according to the invention, was after storage wet in the open, cured and completely lost its free flowing properties.

Example 2

37.8 kg of milled Gafea-phosphate (9o i "through a screen with 0.152 mm mesh size) 3» 4 kg potassium chloride (6o $> through a sieve of 0.152 mm mesh size) mixed and 0, o9 kg of magnesium stearate were mixed in a ribbon blender. The material was stored in the Preien for 6 months and was then still free-flowing.

The analysis showed no detectable loss of potassium salt.

Oafsa phosphate ore was ground in a series of mills and the last mill was fed with 55.9 t of phosphate ore per hour (90 i » duroh • in a sieve of less than 0.053 mm mesh size) together with 55.7 kg of stearic acid in conventional flooken form.

009884/1721

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The product obtained at 6O ⁰ C of this mill was stored outdoors and "retained its free-flowing characteristics of (95 1 'through a sieve of O, O53 mm mesh size).

Example 4

Unmilled Gafsa phosphate ore was used in an amount of 4.06 t per hour were fed to a pulverizing mill and 8.1 kg per hour were added to this mill immediately before the addition molten stearic acid sprayed onto the ore charge.

The product leaving the mill at 42 ⁰ C with a specific surface area of 375o cm / g. After six months of storage in the Preien, this product was still very suitable for use as a powdered phosphate fertilizer.

BATH ORIGINAL

009884/1721

Claims (1)

Claims 1 · Fertilizer preparation from ground or pulverized phosphate ore, characterized in that it is with a treated with a water-repellent substance, preferably coated. 2. Fertilizer preparation according to claim 1, characterized in that the phosphate ore does not contain any particles that are larger than 0.5 mm, and it has a specific surface area of at least 500 cm / g « 3 fertilizer preparation according to claim 1 and 2, characterized in that that it is a long-chain fatty acid, a water-insoluble salt thereof, as the water-repellent substance long-chain aliphatic amine, a silicone, a mixture of two or more long-chain fatty acids, a mixture of two or more fatty acid salts or a mixture of one or more long-chain fatty acids with one or more long-chain fatty acid salts 4. fertilizer preparation according to claim 3, characterized in that in that it is called stearic acid, palmic acid, as a large fatty acid. Contains lauric acid or oleic acid. 5. fertilizer preparation naoh claim 3t characterized in that it as a salt of the long-chain fatty acid calcium, aluminum, magnesium or zinc stearate, calcium or zinc palmitate, Contains aluminum ricinoleate or aluminum oleate. 0 0 98 8 4/1721 ^ßAD original 6. Fertilizer preparation naoh claim 3, characterized in that the long-chain aliphatic amine is stearylamine is used. 7. Fertilizer preparation according to claim 3, characterized in that it contains -an alkyl silicone as silicone. 8. fertilizer preparation according to claim 1 to 7, characterized 'draws that it is the water repellent substance in one Amount of 0.05-0.5% by weight based on weight of phosphate ore contains. 9. A method for producing an improved fertilizer preparation according to claim 1 to 8, characterized in that powdered phosphate ore is treated with a water-repellent substance, preferably brought into intimate contact, and thereby the powdered ore is removed from the water-repellent one , 1o · Method according to claim 9 »daduroh characterized in that the water-repellent substance is brought into intimate contact with the pulverized ore during grinding · 11, method according to claim 9 and 1oj daduroh characterized, that dlt water-repellent Subitana in the form of plooken or pearls or in a molten state is added to the partially ground phosphate, and the two Materials susararaen to be married « 009884/1721 bad original -κ- " ⁰ 12. The method according to claim 11, characterized in that that a fatty acid a few degrees above its melting point is used as a water-repellent material will. 13. The method according to claim 9 to 12, characterized in that that a long-chain fatty acid salt is used as the water-repellent salt, except for a specific one Surface from 2o opo to 15o,000 cm / g has been ground is. The patent attorney 009884/1721 ^ßAD orig / nal