JPS5846448B2 - Ammonium Funriyutai Kumisaibutsu - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides ammonium nitrate (hereinafter referred to as
It's called ``Soan''.

) It concerns powder and granular materials.

Ammonium nitrate powder has strong hygroscopicity, and also tends to solidify due to changes in solubility or crystal transition (due to changes in volume) due to temperature, which poses a serious problem in practical use.

Hitherto, ammonium nitrate powder and granules containing a mixture or condensation reaction product of aliphatic amine and higher fatty acids with improved caking properties have been known, but although the caking properties are improved to a certain extent, It was still far from sufficient, and further improvements were desired.

In view of the above circumstances, the present inventors have conducted various studies with the aim of providing ammonium nitrate powder with improved caking properties. The present invention has been completed based on the finding that an excellent anti-caking effect can be achieved when combined with a salt in ammonium nitrate powder and granules.

That is, the gist of the present invention is that ammonium nitrate powder (1) (
A) aliphatic amine and/or its salt and higher fatty acid,
Or (B) a mixture of aliphatic amine and higher fatty acid from 40 to
A treated product obtained by heat treatment at 130°C and at a temperature higher than the melting temperature of the mixture; and (2) at least one metal selected from alkali metals, alkaline earth metals, aluminum, iron, copper, and lead. An ammonium nitrate powder composition with improved caking properties is obtained by blending the present invention with an inorganic acid salt and/or an organic acid salt.

The present invention will be described in detail.

Examples of aliphatic amines used in the present invention include saturated aliphatic monoamines, saturated aliphatic diamines, saturated aliphatic triamines, unsaturated aliphatic monoamines, unsaturated aliphatic diamines, and unsaturated aliphatic triamines. , a linear saturated aliphatic monoamine having 6 to 22 carbon atoms is used.

Specific examples of linear saturated aliphatic monoamines include hexylamine, octylamine, decylamine, dodecylamine, hexadecylamine, and octadecylamine.

The salt of the aliphatic amine may be either an inorganic acid salt or an organic acid salt. Examples of the higher fatty acid include saturated higher fatty acids and unsaturated higher fatty acids.

Specific examples of saturated higher fatty acids include hebutanoic acid, octanoic acid, decanoic acid, dodecanoic acid, hexadecanoic acid, octadecanoic acid, and tocosanoic acid.

Specific examples of unsaturated higher fatty acids include cis-9-octadecenoic acid, cis-9-cis-12-octadecadienoic acid,
Examples include 9゜12.15-octadecatrienoic acid,
Usually, saturated higher fatty acids having 12 to 22 carbon atoms are used.

The metal salts used in the present invention include alkali metals such as sodium and potassium, alkaline earth metals such as calcium and magnesium, and inorganic and organic acid salts of metals such as aluminum, iron, copper, and lead. , usually sulfates, nitrates, phosphates, carbonates, hydrochlorides, oxalates of these metals,
Examples include acetates and mixtures thereof.

Specific examples of these metal salts include sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate, barium sulfate, sodium nitrate, potassium nitrate, magnesium nitrate, potassium phosphate, calcium phosphate, potassium carbonate, barium carbonate, potassium chloride, and chloride. barium,
Examples include potassium oxalate, magnesium oxalate, potassium acetate, calcium acetate, aluminum sulfate, iron sulfate, copper sulfate, lead sulfate, and the like.

In the present invention, an aliphatic amine and/or its salt, a higher fatty acid, and a metal salt are added to ammonium nitrate powder, or a mixture of an aliphatic amine and a higher fatty acid is heated at 40 to 130°C and the melting point of the mixture is By adding a heated product obtained by heat treatment at the above temperature and a metal salt, ammonium nitrate powder and granules with improved caking properties are obtained.

The combination of aliphatic amine and higher fatty acid to be used is not particularly limited, but from the viewpoint of preventing caking of the obtained ammonium nitrate powder and granules, straight chain aliphatic amines having 16 to 18 carbon atoms are usually used. A combination of one or more monoamines selected from monoamines and one or two or more selected from higher fatty acids having 16 to 22 carbon atoms is preferred, and in particular, a combination of a linear aliphatic amine having 16 to 18 carbon atoms and a carbon A combination with octadecanoic acid number 18 is preferred.

In addition, adding a heated product of an aliphatic amine, a higher fatty acid, and a metal salt rather than adding an aliphatic amine, a higher fatty acid, and the above-mentioned metal salt produces ammonium nitrate powder with improved caking properties. It is preferable because it can be obtained.

To obtain a heated product, the higher fatty acid is usually 0.5 to 1.0 mol, preferably 0.7 mol per mol of aliphatic amine.
It is necessary to heat-treat the mixture of 5 to 1,0 mol at a temperature of 40 to 130° C., preferably 60 to 100° C., and above the melting temperature of the mixture.

If the heat treatment temperature is outside the above temperature range, the expected anti-caking effect cannot be obtained.

A method of adding an aliphatic amine, a higher fatty acid or a heated product thereof, and the metal salt to ammonium nitrate powder is, for example, charging the ammonium nitrate powder to a kneader or a Rossier type granulator; The aliphatic amine is melt-sprayed and then the higher fatty acids and the metal salts mentioned above are added in powder form.

In the latter case, the heated product is added in a molten state and then the metal salt is added in powdered form, or the heated product is allowed to cool and solidify, and then pulverized and both are added in powdered form.

The blending ratio of additives in the present invention varies somewhat depending on the compound added, but for example, the weight ratio of higher fatty acids to aliphatic amines is 0.02 to 10, preferably 0.5 to 10.
10% by weight and the metal salts mentioned above are added in a proportion of 0.02 to 10% by weight, preferably 0.015 to 5% by weight.

In addition, when using a heated product of an aliphatic amine and a higher fatty acid, for example, the above-mentioned metal salt is added at a weight ratio of 0.02 to 10, preferably 0.5 to 3, to 1 of the heated product. added in proportion.

The ratio of these additives to ammonium nitrate powder and granules is usually such that the total amount of additives is 0.01 to 1.
．． G is added so that it is within the range of 0 weight rice.

The ammonium nitrate powder and granules targeted by the present invention are usually powdery,
Crystalline and granular ammonium nitrate for fertilizers or porous granular AN
Ammonium nitrate for FO explosives, etc. is applied.

According to the present invention, by adding an aliphatic amine, a higher fatty acid or a heated product thereof, and the above-mentioned metal salt to ammonium nitrate powder, it is possible to obtain ammonium nitrate powder with significantly improved caking properties. Furthermore, when these are added to porous granular ammonium nitrate for ANFO, it also has the effect of being able to obtain granular ammonium nitrate for ANFO having a high detonation velocity.

Hereinafter, the present invention will be explained in more detail with reference to examples. In the examples, "φ" indicates "weight φ.'' Example 1 Octadecyl was added to granular ammonium nitrate with a moisture content of 3.5 strips as a drying accelerator. Amine mixture containing mainly amines (manufactured by Kao Soap Co., Ltd.)
Porous granular ammonium nitrate (water content 0.11%, Octadecanoic acid (amine content 0.03%, pore volume 0.18 CC/g, average particle size 1.5 ig) was placed in a Lozier type granulator and pulverized to 100 meshes or less while rolling, and various metal salts. 0.
0.1%, and the consolidation strength was measured by the method described below.

For comparison, 0.02% of the amine mixture containing octadecylamine as a main component was melt-added to the porous granular ammonium nitrate, and the consolidation strength was similarly measured.

The results are shown in Table-1. Example 2 Porous granular ammonium nitrate (water content: 0.1 h, pore volume: 0.1 h) obtained by drying in the same manner as in Example 1, except that no drying accelerator was added.
18Cf, /9, average particle size 1.5) was placed in a Rossier type granulator and rolled while heating products of aliphatic amines and higher fatty acids obtained by the following method and various metal salts.
An amine mixture containing mainly octadecylamine (octadecylamine manufactured by Kao Soap Co., Ltd.: 66 Hiroshi Hexa After slowly adding 142 g of octadecanoic acid to 134.5 g of decylamine (3o%, tetradecylamine) with stirring, the mixture was kept in a melted and stirred state for 10 minutes.

Next, this material was evaporated, solidified, and crushed to less than 100 mesh pieces.

For comparison, the consolidation strength was also measured in the same way for the product without the heating product and metal salt (additive-free product) and the product with only octadecanoic acid added. Also, the detonation velocity was measured by the Dautritsch method. Therefore, the results are shown in Table 2 together with the results of consolidation strength measurements.

Consolidation strength measurement method: The sample was placed in a vinyl chloride cylinder measuring 70R1ILφX100mm, a load of l〇- was applied, it was covered with a polyethylene bag, and stored in a constant temperature and humidity chamber.
After the ammonium nitrate undergoes crystal transition twice in one cycle from 0°C to 20°C over approximately 12 hours, it is taken out from the cylinder and measured for consolidation strength using a consolidation strength measuring device, Tensilon tJTMIU model (manufactured by Toyo Baldwin KK). It was measured.

Claims (1)

[Scope of Claims] 1 Ammonium nitrate powder is mixed with (1) (A) an aliphatic amine and/or its salt and a higher fatty acid, or (B) a mixture of an aliphatic amine and a higher fatty acid at a concentration of 40 to 40%.
A treated product obtained by heat treatment at 130°C and at a temperature higher than the melting temperature of the mixture; and (2) at least one metal selected from alkali metals, alkaline earth metals, aluminum aluminum, iron, copper, and lead. inorganic and/or organic acid salts of. An ammonium nitrate powder composition with improved caking properties, which is obtained by blending the following.