JPS5832015A - Preparation of glauber's salt having high free flowability - Google Patents

Abstract

PURPOSE:To obtain Glauber's salt having high free flowability and dispersible and soluble easily in cold water, by granulating powdery Glauber salt in the presence of a water-soluble binder and water, and drying and classifying the granules. CONSTITUTION:Powdery Glauber salt is mixed homogeneously with a water- soluble binder such as carboxymethylcellulose, etc. and water at weight ratios of 100:(0.5-10):(5-30), and the mixture is granulated and dried. The granules are classified during the above process so as to make a most part of the product to fall within the range of 20-80 mesh. Since the Glauber salt obtained by this process has high free flowability and contains spaces between the particles, it can be piled up for a long period without causing caking phoenomenon. As the salt can be dissolved in water rapidly, it can be used easily in combination with other materials.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the use of Glauber's salt, which is free-flowing and rich in C and easily disperses and dissolves in cold water. ! This relates to the m method.

Glauber's salt originally has the property of being easily soluble in water, but because it is assimilated into block pressure accompanied by the gaking phenomenon, the dark contact with water is interrupted inside it, and it takes a lot of time and effort to dissolve it. I need it.

Conventional methods for reversing this type of problem with nitrate pressure, such as surfactants and phosphates, cannot be said to be in a satisfactory state in terms of effectiveness.

In view of these circumstances, the inventors of the present invention repeatedly conducted research and experiments. As a result, they added a predetermined amount of water-soluble glue and water to powdered Glauber's salt, stirred and mixed it, granulated it, and dried it to obtain a predetermined particle size. The intended purpose was achieved by making it possible.

Glauber's salt produced by the method of the present invention is granular and highly free-flowing, with voids formed between each particle, so even if it is deposited over a long period of time, it will not cause the gaking phenomenon, and its bulk will increase. Since the specific gravity is usually reduced to a range of 0.3 to 11/l, it exhibits good dispersibility and dissolves quickly in water. It is possible to bind it extremely easily and to completely classify the glauber's salt in the formulation.

Typical water-soluble thickeners suitable for carrying out the present invention include noke, carboxymethyl cellulose, methyl cellulose, starch, polyvinyl alcohol, etc., and the added acid may vary somewhat depending on the type of water-soluble gosashi. Should be, but mirabilite 1
A range of 5 to 10 parts per 0.00 tons is possible, preferably 2 to 6 parts, and if the amount of acid added to the water-soluble subphase to Glauber's salt is too large, the property of Glauber's salt Vr However, it is not preferable that there is an i-kawa direction that promotes the gooking action without changing the wood.

The amount of water added to mirabilite is 5~5 to 100 layers of mirabilite.
The particle size of the product can be adjusted by adjusting the water content within this range.If the water content is too small, granulation will be difficult, and if it is too much, the drying process will be affected. Reduce efficiency.

In the granulation process of the present invention, a vibrating type, a fluid type, a compression molding plate, or an extrusion molding type granulator can be used, and it is preferable to operate the granulator at the transition temperature of mirabilite μF.] 7.

The particle size of the product is preferably 20 to 80 mesh [7 pieces, 2° to 60 mesh range VC! If the number of particles smaller than 8° mesh increases, it is possible to use an inert substance other than Glauber's salt f and E7 paste together for granulation.

The present invention will now be illustrated in detail with reference to Examples and Reference Examples.

The units of numerical values are 1i unless otherwise specified.
：The Gooking test is for product 251.
(was packed in a kraft packaging bag, a load of 360 kg was applied to it, and the solidification phenomenon was observed at a constant temperature and humidity of 80%, and the solubility test was -4
-0 °C water 1e is stirred at 120 times per minute Ea degree,
100 f of Glauber's salt was added to this and the time required for complete dissolution was measured.

Example 1 Using a ribbon mixer, 100 parts of powdered Glauber's salt (particle size of 100 mesh or less), 2 parts of carboxymethyl cellulose, and 16 parts of water were uniformly kneaded while heating at a temperature of 40 to 50"C. The resulting wet granules were placed in a fluidized fluidized dryer and dried for 1 hour at a temperature of about 105'C. The particle size distribution of the treated Glauber's Salt was 15% for 20 mesh, 3% for 20-6o mesh, and 12% for 20-60 mesh. /cj.

The granulated Glauber's salt is packaged to reduce the googling phenomenon by 11 (+1).
When the solution was exposed to water, no pudding was observed, and the solution was completely dissolved in 10 seconds in a water solubility test tank.

Example 2 Using 100 parts of powdered Glauber's salt, 30 parts of soda carbonate, 3 parts of carboxymethyl cellulose, and 20 parts of water, a granular product of 20 to 60 ml was recovered by sieving and poured to a bulk specific gravity of 0. ' 2 f/tJ, no solidification phenomenon was observed in the Gooking test even after passing through the ridge for 6 months, and the dissolution time in water was 7 seconds.

6- Example 3 100 parts of powdered Glauber's salt and 6 parts of carboxymethyl cellulose were added to a vibrating granulator, and while stirring and mixing, 20 parts of water was added.
The granules were uniformly sprayed to form wet granules, which were heated in a box dryer at a temperature of 105°C for 1 hour.
0 mesh 52.7%, 60 mesh 7 Yuanda - 42%, and when 20 to 60 mesh was recovered by sieving, porous granular Glauber's salt was obtained, and its poured bulk specific gravity was a, asf/d. In the Gooking test, S
No % assimilation phenomenon was observed, and the solubility test showed that it was completely dissolved in 5 seconds.

Example 4 Using a mixer type water granulator, powdered Glauber's Salt 100
1 part and 2 parts of carboxymethyl cellulose were mixed with stirring and 10 parts of water was uniformly sprayed to make a wet granule, which was dried in the same manner as in Example 1. As a result, the particle size distribution was 20 parts. Metschone 10.5%, 20-60
Mesh L is 66.7-7%, 60 mesh under is 22.8%, and the 20 to 60 mesh granular product recovered by sieving is poured and filtered with a bulk specific gravity of 0.621/d, and the Googing test is carried out. No solidification phenomenon was observed even after 6 months, and the dissolution time in water was 8 seconds.

Example 5 Using the same granulator as in Example 4, while stirring and mixing 100 parts of powdered Glauber's salt, 50 parts of soda carbonate, and 3 parts of carboxylic methyl hetylrose, 15 parts of water was uniformly sprayed to moisten the mixture. As a result of preparing a granular material and drying it in the same manner as in Example 1, the particle size distribution was 20 mesh 6.1
%, 20-60 mesh 53.6%, 60 mesh under 40.3%, and the granular product of 20-60 mesh recovered by sieving has a pouring electrical ratio tO, 57 f/cd.
In the Gooking test, no solidification phenomenon was observed for 6 months, and in the solubility test, it was completely dissolved in 5 seconds.

Reference Example The bulk specific gravity of the pouring iron used in the above example was 1.2f/I? J
As a result of bagging powdered Glauber's salt (particle size of 100 mesh or less) and conducting the same gooking test as above, the results were 11
After f months, it completely solidified into a block shape, and when the dissolution rate of this block-formed Glauber's Salt was measured, it took 180 seconds to completely dissolve.

93

Claims (1)

[Claims] Powdered Glauber's salt, water-soluble thickener and water were mixed in a weight ratio of 10O:O,
S~10: A free-flowing VC characterized by uniformly stirring and mixing with a side ratio of 5 to 30, sizing, drying, and sizing most of it into granules of 20 to 80 mesh. The manufacturing method of rich mirabilite.