JPH10298540A - Production of snow melting agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quickly-acting snow melting agent free from water and having high solubility. SOLUTION: This snow melting agent (10) can be produced by baking (2) magnesium hydroxide [Mg(OH)2 ] or magnesium carbonate (MgCO3 ) (1) to form fine particles (6) of magnesium oxide, mixing and reacting (7) the fine powder (6) with acetic acid by a kneader and granulating the obtained magnesium acetate (8) (MA) with a granulator (9). A liquid snow melting agent (10a) is produced by dissolving the magnesium acetate (MA) in water to obtain an aqueous solution (9a) having a concentration of 20-50%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for producing a snow melting agent produced from magnesium hydroxide or magnesium carbonate.

[0002]

2. Description of the Related Art Conventionally, as a snow melting agent, there are salt, calcium chloride, urea and the like, but salt and calcium chloride generate rust or inhibit plant growth. Urea does not have such a drawback, but it does provide eutrophication due to the presence of nitrogen. The snow melting agent produced from dolomite does not have the above-mentioned disadvantages, but is difficult to produce. For this reason, the present inventor has proposed a snow melting agent comprising calcium acetate magnesium salt (CMA) produced from natural lightly burned dolomite Mg (OH) ₂ as disclosed in Japanese Patent Application No. Hei.
-75190.

[0003]

However, the snow melting agent made of calcium acetate magnesium salt (CMA) produced from this natural lightly burned dolomite has a low melting rate, lasts a long time, and is slow-acting, but not fast-acting. .

[0004]

SUMMARY OF THE INVENTION The present invention is intended to eliminate such a drawback, and is directed to magnesium hydroxide (Mg (OH) ₂ ).
Alternatively, magnesium carbonate (MgCO ₃ ) 1 is calcined 2 to obtain a fine powder 6 of magnesium oxide, and a magnesium acetate salt (MA) 8 obtained by a kneader-mixing reaction 7 of the fine powder 6 and acetic acid is formed by a granulator 9. This is a method for producing a snow melting agent, wherein the snow melting agent is granulated. Further, magnesium hydroxide or magnesium carbonate is calcined to obtain a fine powder of magnesium oxide, and a magnesium acetate salt (MA) obtained by a kneader-mixing reaction of the fine powder and acetic acid is dissolved in water to form a 20 to 50% aqueous solution 9a. , Liquid snow melting agent 1
0a, which is a method for producing a snow melting agent.

According to the present invention, since calcination 2 is carried out, there is no moisture and it can be powdered, so that it is easy to scatter and has good solubility, so that it has a rapid effect.

[0006]

FIG. 1 shows a first embodiment of the present invention. A natural (magnesite) or synthetic magnesium hydroxide or magnesium carbonate 1 is calcined 2 to obtain a magnesium oxide powder, which is crushed by a ball mill 3 to obtain a powder 4
And This powder 4 is sieved 5 with a 50 mesh pass,
Fine powder 6.

Next, the fine powder 6 is kneaded with a water 10%
The kneader-mixing reaction 7 is carried out with the following acetic acid at a temperature of from room temperature to 100 ° C., and the kneader-mixing reaction 7 is completed in about 1 hour. This kneader may be any one of uniaxial, biaxial, triaxial, etc., and is coated with titanium, sprayed with titanium, or coated with an organic material such as epoxy or Teflon in order to impart acetic acid corrosion resistance. During the kneader mixing reaction 7, CaO and MgO may be appropriately added. Since this kneader mixing reaction 7 is an exothermic reaction, it is cooled. Magnesium reacts slowly.

[0008] The magnesium acetate salt (M
A) Since 8 is too fine, the granules 9 are
It is granulated into particles having a particle diameter of 0 mm, preferably about 5 mm, to obtain a snow melting agent 10. The granulator 9 may be any of a screw type, a high-speed mixer, a Laedige mixer, a marmelizer (trade name), and an extrusion type.

The thus obtained snow melting agent 10 was sprayed on snow and had a good snow melting effect. At this time, the magnesium acetate dissolved quickly and was effective.

In a second embodiment of the present invention, the magnesium acetate salt (MA) 8 is dissolved in water to form a 20 to 50% aqueous solution 9a to form a liquid snow melting agent 10a.

[0011]

As described above, since the snow melting agent 10 according to the present invention is baked 2, it has no moisture and can be powdered, so that it can be easily scattered and has good solubility, so that it has an immediate effect. In the case of an aqueous solution, it is easier to spray and has a faster effect.

[Brief description of the drawings]

FIG. 1 is a flowchart schematically showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnesium hydroxide or magnesium carbonate 6 Fine powder 7 Kneader mixing reaction 8 Magnesium acetate salt (MA) 9 Granulator 10 Snow melting agent 9a Aqueous solution 10a Snow melting agent

Claims (2)

[Claims] 1. Magnesium hydroxide or magnesium carbonate is calcined to obtain a fine powder of magnesium oxide, and a magnesium acetate salt (MA) obtained by a kneader-mixing reaction of the fine powder and acetic acid is granulated by a granulator. A method for producing a snow melting agent, wherein the method is a snow melting agent. 2. Magnesium hydroxide or magnesium carbonate is calcined to obtain a fine powder of magnesium oxide, and a magnesium acetate salt (MA) obtained by a kneader-mixing reaction between the fine powder and acetic acid is dissolved in water to form a 20 to 50% A method for producing a snow-melting agent, comprising using an aqueous solution of the above as a liquid snow-melting agent.