FI67169B - FOERFARANDE FOER FRAMSTAELLNING AV MINERALBLANDFODER - Google Patents

Abstract

1. Process for making mineral compound cattle food with the aid of a mixer, characterised in that a pulverulent mixture of disodium phosphate, dimagnesium phosphate and dicalcium phosphate, cattle salt, feed lime, and optionally bran, trace elements and vitamines is admixed with the quantity of an at most 15 weight % phosphoric acid just necessary for its water content to be at least 13 weight %, based on the sum of the phosphates in the mixture ; the phosphoric acid-containing mixture is mixed in the mixer over a period of at least 3 minutes at 40 to 120 rpm and thereby granulated ; the resulting moist granulate is dried over a period of at least 3 minutes with the aid of a stream of warm air while being mechanically agitated, the temperature of the stream of warm air being selected so that the temperature at the surface of the dried granulate does not exceed 60 degrees C.

Description

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Fktwe · och register Styrelsen ^ tombtum> Kl * d «* 31.10.84 (32) (33) (31) iyydsejr« moiken —Baftrd prlorlut 31.08.79

Federal Republic of Germany Tyskland (DE) P 2935171.1 (71) Hoechst Aktiengesel1schaft, D-6230 Frankfurt / Main 80, Federal Republic of Germany Förbundsrepubliken Tyskland (DE) (72) Franz-Josef Dany, Erftstadt, Hannsjstadt , Gerd Kalteyer, Erftstadt, Federal Republic of Germany1ta-Förbundsrepubliken Tyskland (DE) (74) Oy Kolster Ab (54) Method for the production of mineral feed - Förfarande för fram-ställning av mineralblandfoder

The invention relates to a process for preparing mineral compound feed by means of a mixer.

It is known to prepare mineral compound feed by mixing together sodium, magnesium and calcium phosphates, cattle salt, feed lime, bran, vitamins and trace elements. In this case, the mixing time and the agitator have a significant effect on the uniform distribution of the substances, in which case a forced agitator with a movable agitating part in the form of buckets, vanes or coils is most often used ("Ullmanns Encyklopädie der technischen Chemie", 4th edition, Weinheim 1976, pages 41-60).

DE-A-2 049 795 discloses a process for preparing a mineral supplement mixture using a high-speed mixer. According to the method, a homogeneous mixture of monocalcium phosphate, sodium chloride, magnesium oxide and trace elements consisting of zinc, copper, manganese and cobalt 2667169 r is prepared. Molasses, phosphoric acid and water are added to the homogeneous mixture. After a short mixing time, a granulate is obtained.

DE-A-2 643 683 describes the preparation of a powdered or granular mineral mixture by reacting finely divided calcium carbonate containing 15-20% by weight of water with aqueous phosphoric acid containing at least 40% by weight of ^ 2 ^ 5 '7a with the addition of other minerals and vitamins.

In the process according to DE-A-2 430 267, a powder mixture of trace elements is mixed with phosphoric acid and calcium, magnesium, zinc, copper, manganese and iron oxides, carbonates or hydroxides and dicalcium phosphate in the presence of both phosphorus oxides, the reaction product consists mainly of monohydrogen phosphates.

DE-A-2 612 887 relates to a process for preparing a granular silage additive for a corn silo, in which oxides, hydroxides or carbonates of magnesium, calcium and sodium and urea are thoroughly mixed in a granulation zone and concentrated phosphoric acid is injected into these substances. The phosphates of sodium, calcium and magnesium and urea thus formed are granulated together with the recovered material.

FI-A-43 665 describes a process for preparing a supplementary feed mixture based on sodium, magnesium and calcium phosphates, in which fluorine- and arsenic-free phosphoric acid with a p205 content of 40-60% by weight is neutralized with oxides, hydroxides or carbonates of sodium, magnesium and calcium, optionally trace elements (copper, manganese, iron, zinc, cobalt) and formed in the neutralization.nut hot, moist crumbly product is cooled and dried.

The disadvantage of these mixtures is that they contain 20% or more dust. This amount of dust causes respiratory irritation when eating livestock feed. In addition, these blends, especially when using coarse-grained blend ingredients, show separation of the finished product.

It has now been found that mineral compound feeds can be prepared from inexpensive powdered compound ingredients using conventional mixing equipment to give finished products that are virtually dust-free and do not separate the individual compound ingredients. The process according to the invention is characterized in that a powder mixture containing disodium phosphate, dimagnesium phosphate and dicalcium phosphate, cattle salt and feed lime and optionally bran, trace elements and vitamins is added in an amount of at least 15% by weight of phosphoric acid, phosphoric acid % by weight, calculated on the sum of the phosphates in the mixture; and that the phosphoric acid-containing mixture is mixed in a mixer for at least 3 minutes at 40-120 rpm to granulate, and the resulting wet granulate is mechanically dried with a stream of hot air for at least 3 minutes, the hot air temperature being selected so that the surface temperature of the dried granulate does not exceed 60 ° C.

According to the method, for example, 3 to 12% by weight of phosphoric acid can be used, and the mixture containing dilute phosphoric acid can be stirred at a rate of 80 to 115 rpm. Molasses, e.g. up to 10% by weight of molasses, based on the mixture, can also be added to the mixture.

The method according to the invention gives well-cured, mechanically resistant granules which are not damaged even when removed from the sacks. This is apparently based on the fact that some of the only partially hydrated acid phosphates in the mixture may still chemically bind water, in which case, however, there must be an excess of water. Drying of the excess water then results in felted crystallites, the formation of which is apparently promoted by phosphoric acid. For example, when molasses alone prevents the felting of the crystallites, sufficiently stable granules are obtained when molasses and phosphoric acid are used simultaneously.

If the excess water, for example during storage, always evaporates slowly, there is a risk of the obtained granular particles sticking together. According to the invention, this is prevented by drying the surface of the wet granules by means of a stream of warm air using mechanical movement such as turning. In this case, the moist granules are passed through a fine-meshed sieve, whereby warm air is formed by means of a fan heated to a temperature of, for example, 220 ° C and passed to the funnel by means of a tube from below through the granules. When the surface of the granular particles dries, they are prevented from packing together. The surface temperature of the granules then remains below 60 ° C so that any contents are not destroyed.

In the method according to the invention, the rotational speed of the mixer, which depends on the type of mixer and the liquid composition, is particularly significant. At high rotational speeds, the proportion of fine ingredients increases; at speeds above 500 rpm, the dust fraction is considerable.

The accompanying drawings (Figures 1-3) show the results of the following Examples 1-7 as a result of screen analyzes as bar graphs, with the numbers above the bars denoting the example number.

Example 1 (comparative example)

To the 15 kg tensile blade mixer were added: 2000 grams of calcium magnesium sodium phosphate (9 wt% Ca, 5 wt% Mg, 12 wt% Na and 17.5 wt% P), 1500 grams of calcium carbonate (feed lime), 500 grams of sodium chloride (cattle salt), 200 grams of anhydrous dicalcium phosphate, 300 grams of molasses, about 70%.

The mixture was stirred for 5 minutes at 115 rpm.

Example 2 (according to the invention)

The same ingredients as in Example 1 were placed in the same apparatus as in Example 1, except that the molasses was dissolved in 300 grams of water to which 4.7 grams of 85% phosphoric acid had been added.

The mixture was stirred for 5 minutes at 115 rpm and then dried for 10 minutes with warm air at 220 ° C as measured from the exhaust pipe of the warm air generator.

5 67169

Example 3 (comparative example)

To the vortex mixer with a tensile strength of 1600 kg were added: 250 kg of calcium-magnesium sodium phosphate (9% by weight of Ca, 5% by weight of Mg, 12% by weight of Na and 17.5% by weight of P), 110 kg of feed lime, 40 kg of animal salt, 18 kg of anhydrous dicalcium phosphate, 50 kg of trace elements.

To these substances were added 3 kg of 85% phosphoric acid in 35 liters of water and at the same time, but in another place 35 kg of molasses (about 70%) and the whole mixture was stirred for 5 minutes at 80 rpm. Drying took place in a bag for 24 hours, at which time the whole mass hardened. Squeezing the bag again gave a flowable granular mixture.

Example 4 (according to the invention)

Equipped with a conical mixer with a stirring coil at 24 rpm with complete circular motion for 35 seconds: 400 kg of calcium-magnesium-sodium phosphate (9% by weight of Ca, 5% by weight of Mg, 12% by weight of Na, 17% by weight) were placed -% P), 240 kg of feed lime, 100 kg of animal salt, 40 kg of anhydrous dicalcium phosphate, 10 kg of iron III oxide.

To these substances, which filled about 1/3 of the capacity of the mixer, a solution containing 60 l of water, 60 l of molasses (70-85%) and 4.5 l of 85% phosphoric acid was added portionwise as quickly as possible. After allowing the mixer to run for 5 minutes, a wet granulate was obtained which was dried for 6 minutes with hot air at 220 ° C as measured from the hot air condenser outlet tube.

Example 5 (according to the invention)

To a twin-screw mixer with horizontal axes and a tensile strength of 1000 kg were added: 300 kg of calcium-magnesium-sodium phosphate (9% by weight of Ca, 5% by weight of Mg, 12% by weight of Na and 17.5% by weight of P ), 75 kg of feed lime, .6 671 69 38.5 kg of animal salt, 25 kg of bran, 10 kg of trace elements, 1.5 kg of vitamin concentrate.

To these substances was added a solution containing 45 l of water, 50 kg of molasses and 2.5 kg of 85%. phosphoric acid. The stirrer was operated for 5 minutes at 60 rpm. The resulting wet granulate was dried for 10 minutes with hot air at a temperature of 180 ° C measured from the exhaust pipe of the hot air generator. Example 6 (according to the invention)

To the aurora steel mixer with a tensile strength of 15 kg were added: 2300 g of calcium-magnesium-sodium phosphate (9% by weight of Ca, 5% by weight of Mg, 12% by weight of Na and 17.5% by weight of P), 1500 g feed lime, 500 g anhydrous dicalcium phosphate 500 g cattle salt.

To these substances were added 4.7 g of 85% phosphoric acid and 445 g of water, and the whole mixture was stirred for 7 minutes at 115 rpm. The obtained granulate was dried for 5 minutes with hot air at a temperature of 220 ° C measured from the exhaust pipe of the hot air generator.

Example 7 (according to the invention)

To the apparatus of Example 6 were added: 2000 g of calcium magnesium sodium phosphate (9% by weight of Ca, 5% by weight of Mg, 12% by weight of Na and 17.5% by weight of P), 1500 g of feed lime, 200 g of anhydrous dicalcium phosphate, 500 g of caramene salt.

To these substances was added 9 g of 85% phosphoric acid in 340 grams of water, and the whole mixture was stirred for 10 minutes at 115 rpm. The obtained granulate was dried for 3 minutes with hot air at a temperature of 240 ° C measured from the exhaust pipe of the hot air generator.

Il 67169

Example 8

To demonstrate the effect of the addition of phosphoric acid and / or molasses on the hardness of the granulate granules, an abrasion test was performed.

To this end, various granules, each stored for 24 hours, were sieved to a grain size of between 500 and 2000 μm and ground in each stainless steel drum (volume 800 ml) with eight stainless steel balls (diameter about 20 mm, weight of each ball about 33 g) for 5 minutes. at 100 rpm. Abrasion was then determined by screening the portion that passed the 500 μm sieve.

Each granulate was prepared from 2000 grams of calcium magnesium sodium phosphate (9 wt% Ca, 5 wt% Mg, 12 wt% Na and 17.5 wt% P) and 300 grams of water, as well as from the additives listed in the following table in Example 6 as shown.

Granulate Additive (g) Wear (%) 85% Molasses phosphoric oxygen a - - 52.9 b 4.7 - 43.8 c - 100 73.4 d 4.7 100 66.8

Example 9

The abrasion of the granulate of Example 2 stored for 24 hours was 33.2%, while the abrasion of the granulate of Example 2, prepared without the addition of phosphoric acid, was 35.3%.

Abrasion was determined according to Example 8.

Claims (5)

67169 Process for the preparation of mineral compound feedingstuffs by means of a mixer, characterized in that a powder mixture containing disodium phosphate, dimagnesium phosphate and dicalcium phosphate, animal salt and feed lime and possibly bran, trace elements and vitamins is added in an amount of up to 15% by weight of phosphorus: a water content of not less than 13% by weight, calculated on the sum of the phosphates in the mixture; and that the phosphoric acid-containing mixture is stirred in a mixer for at least 3 minutes at a speed of 40 to 120 rpm to granulate, and the resulting wet granulate is mechanically dried with a stream of hot air for at least 3 minutes, the hot air temperature being selected so as not to exceed 60 ° C. ° C. Process according to Claim 1, characterized in that 3 to 12% by weight of phosphoric acid is used. Process according to one of Claims 1 or 2, characterized in that the phosphoric acid-containing mixture is stirred at a rate of 80 to 115 rpm. Process according to one of Claims 1 to 3, characterized in that molasses is additionally added to the powder mixture. Process according to Claim 4, characterized in that at most 10% by weight of molasses, based on the mixture, is added.