JPH0724471A - Bleaching powder composition - Google Patents

Abstract

PURPOSE:To prevent the of scale and to eliminate the eutrophic the eutrophic problem of rivers, lakes and marshes by preparing a bleaching powder composition used for sterilization, disinfection or the like after dissolving in water by using a bleaching powder composed mainly of calcium hypochloride and an aluminosilicate. CONSTITUTION:In a bleaching powder dissolving equipment for the sterilizing or disinfecting swimming pool water or clean water, the bleaching powder composition prepared by using the bleaching powder composed mainly of calcium hypochloride and the aluminosilicate is used. As the aluminosilicate, for instance, crystalline or porous amorphous one such as Na-A type zeorite, Na-Y type zeorite or mordenite <=4mum in particle diameter is used. And the combining ratio of the aluminosilicate is set to 0.1-20 pts.wt., preferably 0.2-10 pts.wt. per 100 pts.wt. bleaching powder. As a result, the generation of scale on the surface of equipments in contact with water is prevented.

Description

Detailed Description of the Invention

[0001]

The present invention relates to sterilization by dissolving in water.
The present invention relates to a bleaching powder composition containing calcium hypochlorite as a main component, which does not cause scales on inner walls of pipes, containers, devices and the like that come into contact with the aqueous solution when used for disinfection and the like.

[0002]

2. Description of the Related Art JP-A-3-42094 and JP-A-4
In Japanese Patent Application Laid-Open No. 219200, a composition containing a polyphosphate as such a bleaching powder composition is proposed.

[0003]

However, as is well known, polyphosphate is a causative agent of eutrophication in rivers, lakes and marshes.

An object of the present invention is to provide a bleaching powder composition containing calcium hypochlorite as a main component, which does not contain such a substance causing water pollution and does not cause the above scale trouble. It is a thing.

[0005]

DISCLOSURE OF THE INVENTION The gist of the present invention is a bleaching powder composition comprising a bleaching powder containing calcium hypochlorite as a main component (hereinafter referred to as bleaching powder) and a zeolite.

As the bleaching powder which is one of the components of the bleaching powder composition of the present invention, high-grade bleaching powder having 60% or 70% available chlorine (anhydrous salt of calcium hypochlorite, dihydrate, etc.) is used. It can be used preferably.

[0007] As the aluminosilicate, for example, a readily available crystalline material such as Na-A type zeolite, Na-Y type zeolite, and mordenite or a porous amorphous material can be preferably used. The average particle size is 4 μm
The following are desirable: This is because if the particle size is too large, the bleaching powder composition is settled in water.

The optimum blending ratio of the aluminosilicate is the calcium hardness of the water to be treated with the bleaching powder composition,
Although it depends on the hydrogen carbonate ion concentration and the like, usually, if the blending ratio is 0.1 to 20 parts by weight, preferably 0.3 to 10 parts by weight, of aluminosilicate per 100 parts by weight of bleached powder, scale formation is achieved. Can be sufficiently prevented. Bleached powder is commercially available in the form of powder, granules, tablets and the like, but the composition of the present invention can take any of these forms.

The bleaching powder composition of the present invention may be manufactured as follows.

For example, a powdery bleaching powder composition can be obtained by adding a fine powder of aluminosilicate in any step before drying in the conventionally known powdery bleaching powder manufacturing method. It is also possible to obtain the powder thus obtained by a conventional method, that is, by compression molding, extrusion molding, or the like into granules, or by molding with a tableting machine into tablets. it can. A bleaching powder composition in which the bleaching powder and the aluminosilicate are uniformly blended can be obtained by these methods. However, a powdery bleaching powder and an aluminosilicate powder are mixed to form a powdery composition, the powdery composition is molded into a granular composition, and a granular bleaching powder and an aluminosilicate powder are used. Mix,
The bleaching powder composition of the present invention can also be obtained by a method of molding the composition obtained by these methods into tablets. The products obtained by these methods are inferior in uniformity, but the scale-preventing action is not inferior to that of the above-mentioned uniform composition.

[0011]

The action of the aluminosilicate contained in the bleaching powder composition by its ion exchange action is that the bleaching powder composition of the present invention is dissolved in water and does not cause scale on the surface of the material that comes into contact with the water. It is believed to be due to the adsorption of calcium ions in water, preventing the calcium ions from binding with hydrogen carbonate ions.

[0012]

【Example】

Example 1 Granular advanced bleaching powder having 70% available chlorine and N having an average particle size of 4 μm
The a-A type zeolite was mixed in a weight ratio of 100/3 and tableted to obtain a bleaching powder composition consisting of a cylindrical tablet having a diameter of 30 mm and a height of 16 mm. 5 kg of the bleaching powder composition
It was set in the dissolution tank 1, as shown in FIG. 1, HCO, which is adjusted to 30 ° C. in the water heater 6 ₃ ^- water concentration 100 ppm 5
Pass through the dissolution tank 1 at a flow rate of liter / min, and connect the piping 4
When the bleaching powder composition was dissolved until 4 kg was dissolved and the generation state of scale on the inner wall of the pipe 4 was observed, generation of scale was not observed at all.

[0013] Set the Example 2 bleaching powder composition 5kg to dissolver 1, HCO ₃ ^- where the addition to using the water concentration 150ppm was conducted under the same conditions as in Example 1, scale - generating Le is observed at all I couldn't do it.

Example 3 The blending ratio of bleached powder and zeolite was 100 / 0.2 by weight.
Then, set 5 kg of the bleaching powder composition in the dissolution tank 1 and
_When it was carried out under the same conditions as in Example 1 except that water having a ₃ ^- concentration of 20 ppm was used, the production of scale was slightly observed.

Example 4 The Na-A type zeolite of Example 1 was mixed with an average particle size of 10 μm,
Calcium-capturing ability of about 230 mg CaCO ₃ / g (dry basis), water content of 20 wt% Amorphous sodium aluminosilicate was replaced by the same conditions as in Example 1, but no scale formation was observed. .

Comparative Example 1 When a 70% granular advanced bleached powder having the same size as the tablet of Example 1 but not containing zeolite was tested under the same conditions as in Example 1, a large amount of scale was found to have adhered.

[0017]

When the bleaching powder composition of the present invention is used,
Scale is prevented from being generated on the inner wall of the dissolution tank of the bleaching powder dissolution equipment for sterilization and disinfection of water, purified water, etc., and the inner wall of piping pumps, etc., and the wastewater discharged outside the system does not contain phosphorus or nitrogen. It does not cause eutrophication problems in rivers and lakes.

[Brief description of drawings]

FIG. 1 is a diagram showing a process in an example and a comparative example.

[Explanation of symbols]

1: Dissolution tank, 2: Water injection pipe, 3: Sample, 4: Piping, 5: Plate, 6: Hot water device

Claims (3)

[Claims] 1. A bleaching powder composition comprising a bleaching powder containing calcium hypochlorite as a main component and an aluminosilicate. 2. The bleaching powder composition according to claim 1, wherein the aluminosilicate has an average particle size of 4 μm or less. 3. A bleaching powder containing 100 parts of aluminosilicate.
The bleaching powder composition according to claim 1, which is 0.1 to 20 parts by weight per part by weight.