JPH0414407A - Method for solidifying powder minerals - Google Patents

Abstract

PURPOSE:To form a lump or a powder hard to collapse even when powder minerals are again solidified and moisture is added to the solidified one by a method wherein a magnesium oxide material is added to and mixed with powder minerals and the obtained mixture is pressed and solidified. CONSTITUTION:A proper amount of a magnesium oxide material formed into a powder in the same way as powder minerals is added to and mixed with the powder minerals using a proper mixer and the obtained mixture is continuously pressed and solidified by a proper means. For example, the powder mixture is poured in the gap between opposed press rollers and passed therethrough while compressed to be solidified in a plate shape. If necessary, the plate shape solidified matter is further ground by a grinder such as a hammer mill to prepare a granule which is, in turn, screened on a sieve to arrange the particle size thereof. The plate-shape solidified matter or the granule prepared by grinding the same immediately absorbs moisture in air in a keeping process after manufacturing to make it possible to secure a water-insoluble solidified state.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention relates to zeolites used in agriculture, forestry, livestock farming, sericulture, landscaping, water purification, sewage and wastewater treatment, pet litter, and related fields. Diatomaceous earth, kaolin, waxite,
The present invention relates to a method for consolidating powder minerals such as clay, bentonite, or talc so that they do not easily disintegrate even when water is added.

[Prior Art] At present, powder minerals used in the above-mentioned fields or related fields are not harmful (and can be easily solidified and do not disintegrate easily even when water is added). No method of consolidating minerals exists.

The various powdered minerals to be targeted can also be solidified by kneading them with an adhesive and firing if necessary, and it is also possible to solidify them by mixing water-insoluble polymer adhesives, etc. It is possible. However, the former of these techniques cannot be said to be easy, and the latter, although easy, is out of the question since it is not a technique that can be used in the above-mentioned fields.

By the way, in the above-mentioned field, minerals such as zeolite, diatomaceous earth, or bentonite are often used in the form of granules of various particle sizes for soil improvement materials, toilet litter for pets, and other uses. There is.

These granules are usually obtained by crushing mineral lumps, sieving and sieving the resulting granules to ensure the required particle size. However, in most cases, about 70% of the mineral mass is turned into powder during the process of crushing the mineral mass.

As a result, a large amount of unusable powder mineral is produced, which greatly reduces economic efficiency. Naturally, attempts have been made to granulate these powdered minerals to an appropriate particle size, but this has not yet been successful, with the exception of bentonite. However, attempts have been made to add adhesion aids to ensure adhesion and then granulate the mixture. As the adhesion auxiliary material, bentonite, CMC, etc., which are exceptional minerals with adhesive properties, are used. However, since the adhesion aids mentioned above have the property of disintegrating again when water is added, similarly, the mineral particles obtained by adding these materials also disintegrate easily when water is added. . That is, the desired result of obtaining mineral grains that do not easily disintegrate even when water is added has not been achieved.

The same is true even when it is formed into a certain large lump rather than a granule.

[Problems to be Solved by the Invention] By the way, in the fields of agriculture, forestry, landscaping, and related fields, soil improvement materials and other inputs are difficult to consolidate, depending on the amount of input or the state after collapse. If it collapses into a clay-like state, the soil will be deficient in oxygen and plants will suffer from rotting roots, which is extremely inconvenient.

Therefore, in these fields, it is very useful to form powdered minerals into solids that do not easily disintegrate even when water is added.

Furthermore, when clay or the like is used as a carrier for agricultural chemicals, it is easier to handle if it is in the form of granules, and it is preferable from the above points of view that it does not disintegrate later.

Furthermore, it goes without saying that filter media used in the fields of water purification, sewage and wastewater treatment should not disintegrate in water.

Therefore, the object of the present invention is to reconsolidate the powdered minerals so that the minerals used in the fields mentioned above and those used in the fields described above do not cause the problems described above, so that they can be easily reconsolidated by adding water. The aim is to produce lumps or granules that do not disintegrate. As mentioned above, the powdered minerals are produced in large quantities when mineral blocks are crushed to obtain particles of the required particle size, and are hardly usable as they are. The goal is to use minerals without waste by solidifying them into lumps or granules so that they do not disintegrate due to moisture.

[Means and operations for solving the problems] The gist of each of the two inventions of the present invention is as follows.

The gist of the first invention is a method for solidifying powdered minerals, which comprises adding and mixing a magnesium oxide material to powdered minerals, and pressurizing the resulting mixture to solidify it.

The gist of the second invention is to solidify powdered minerals by adding a magnesium oxide material and an adhesion auxiliary material to powdered minerals, adding water and kneading, and drying and solidifying the obtained kneaded product. This is the tying method.

First, we will explain the parts common to both.

The above-mentioned powder minerals are mineral powders used in agriculture, forestry, livestock farming, sericulture, landscaping, water purification, sewage, wastewater treatment, bed litter, or related fields. As long as it is a powder of minerals used in these fields, there is no reason to limit the type beyond that. Examples include zeolite, talc, kaolin, diatomaceous earth, lime, or bentonite. Naturally, there is no question as to why these are turned into powder; most of them are generated during the process of crushing mineral lumps to obtain granules, as described above.

The above-mentioned magnesium oxide material has magnesium oxide as a main component, and is conceptualized to include some magnesium compounds, impurities, and other components. As the above-mentioned magnesium oxide material, light burnt magnesia and heavy burnt magnesia can be used. It goes without saying that other magnesias can also be used.

These magnesium oxide materials have the effect of solidifying powder minerals so that they do not disintegrate even when water is added. Therefore, the mixing ratio may be set to the minimum level depending on the type of target powder mineral. Usually, a sufficient consolidation effect can be obtained with less than 20%.

Next, the first invention will be explained in order.

An appropriate amount of similarly powdered magnesium oxide material is added to the powdered minerals and mixed. A suitable mixer can be used for this.

The resulting powder mixture is subsequently consolidated under pressure using suitable means. For example, the powder mixture is poured between facing pressure rollers and passed through the space while being compressed, thereby solidifying it into a plate shape.

If necessary, the plate-shaped solidified material is further crushed with a crusher such as a hammer mill to produce granules.

The above particles are sieved to adjust the particle size.

The above-mentioned plate-shaped consolidated product or granules produced by crushing the same quickly absorb moisture from the air during the storage process after production, and maintain a consolidated state that does not dissolve in water.

Next, the second invention will be explained step by step.

Powdered minerals and appropriate amounts of magnesium oxide material and adhesion auxiliary material are charged into a suitable kneading means, water is added, and kneaded. The amount of water is preferably determined while observing the above-mentioned +1JII condition. This kneading is performed so that each component is mixed uniformly and the water addition state is averaged.

Note that bentonite, CMC, or other harmless adhesive materials can be used as the adhesion auxiliary material. The above bentonite is more suitable. The purpose of this is to make the kneaded material sticky during the above-mentioned kneading process. Therefore, it is sufficient to use the minimum amount that can cause tackiness during the kneading process.6 A sufficient tackiness effect can usually be obtained with less than 20%.

As described above, in the kneading step, the kneaded material acquires tackiness due to the adhesive force of the adhesion auxiliary material such as bentonite. That is,
The adhesion imparted to the kneaded material by the adhesion auxiliary material enables molding in the subsequent step. In addition, after the water addition and kneading process,
It is presumed that the addition of moisture in the previous step causes the consolidation action of the magnesium oxide material to proceed at the same time.

Next, the kneaded material is taken out as a lump of an appropriate size. Alternatively, it is transferred to a suitable molding machine and molded into a desired shape by the molding machine. The layer or molding is then dried and consolidated in a suitable dryer.

Alternatively, the kneaded material is transferred to a granulator, and is extruded by the granulator to form pellets. Or granulate into spheres or other shapes using other granulators. The shape of the particles does not matter; after that, they are dried and the particle size is made uniform. Drying is done in a suitable dryer. The particle size is made uniform using a suitable sizing machine.

Forming into a certain lump, an appropriate shape, or granulation into an appropriately shaped granule is determined depending on the purpose of use.

The solidified minerals produced according to the first and second inventions as described above are further strengthened during storage. It is presumed that the solidification effect progresses by absorbing moisture in the air.

The thus obtained solidified material does not disintegrate and maintains its solidified state even if it comes into contact with moisture. A mineral lump retains its shape, and a mineral grain also retains its grain state.

Therefore, for various minerals, for example, a large amount of powder produced during the crushing process is formed into granules or lumps of the required size,
Furthermore, since it can be formed into a solidified material that does not easily disintegrate even when water is added, resources can be used effectively.

Furthermore, the obtained mineral concretion is obtained by adding the minimum necessary amount of magnesium oxide material and adhesion auxiliary material as necessary to the target mineral, and performing the above prescribed treatment. Agriculture, forestry, livestock farming, m! Silkworms, landscaping,
It does not contain any harmful substances in water purification, sewage, wastewater treatment, bed litter, or related fields.

On the contrary, it contains effective ingredients in fields such as agriculture and landscaping.

[Examples] Example ■ This example is an example of producing a soil improvement material using zeolite.

Lightly calcined magnesia powder is similarly added and mixed with powdered zeolite.

The percentage is Seven olide: light burnt magnesia = 80:20.

The above mixing is performed using a mixer.

Subsequently, the resulting mixture is poured between pressure forming rollers that rotate facing each other, and is solidified into a plate by passing through the rollers in a compressed state.

The plate-shaped solidified material taken out from between the pressure forming rollers is crushed with a hammer mill, and the resulting crushed material is further sieved to take out granules having a particle size of 1 to 2 mm.

The above-mentioned granules absorb moisture in the air during storage for about a day after production, and maintain a solidified state in which carbon does not dissolve in water.

The above granules serve as a soil improvement material.

Example ■ This example is another example of producing a soil improvement material using Zeolite 1.

Powdered zeolite, lightly calcined magnesia, and bentonite are charged into a kneader and water is added while kneading them.

The mixing ratio is: Powdered zeolite: Lightly calcined magnesia: Bentonite = 60
: 20 : 20.

The amount of water added is about 20% based on the above mixture.

A kneaded material having tackiness is obtained in the kneading step in the above-mentioned kneader. Subsequently, this kneaded material is charged into a granulator, from which it is extruded under high pressure to form pellets having a diameter of IIIITl.

Thereafter, the resulting pellet-like granules were dried with hot air using a rotary dryer, and then the pellets were passed through a sizing machine until the diameter was about 11! The particles are sized using III+ to form particles with a length of about 21 mm.

In this way, solidified pellet-like particles are obtained. This pellet-shaped granule becomes a soil improvement material.

Example ■ This is an example of producing bed litter using zeolite.

Kneader of lightly calcined magnesia and CMC to powdered zeolite
Add water while kneading.

The mixing ratio is: Powdered zeolite: Lightly calcined magnesia: CMC=79+2
The ratio is 0:1.

The amount of water added is about 20% based on the above mixture.

A kneaded material having tackiness is obtained in the kneading step in the above-mentioned kneader. Subsequently, this kneaded material is charged into a granulator, from which it is extruded under high pressure to granulate it into pellet-like granules with a diameter of 21 mm.

Thereafter, the obtained pellet-shaped granules are dried with hot air using a rotary dryer, and then the pellet-shaped granules are sized using a sizing machine to form granules with a diameter of about 2 mm+ and a length of about 3 mm. .

The pellet-shaped granules thus obtained become litter for beds.

Example 2 Powdered diatomaceous earth, lightly calcined magnesia, and bentonite are charged into a kneader and water is added while kneading them.

The mixing ratio is: Powdered zeolite: Lightly calcined magnesia: Bentonite = 60
: 20 : 20.

The amount of water added is about 20% based on the above mixture.

A kneaded material having tackiness is obtained in the kneading step in the above-mentioned kneader. Subsequently, this kneaded material is charged into a granulator, from which it is extruded under high pressure and granulated into pellet-like granules having a diameter of 211ffi.

Thereafter, the obtained pellet-like granules are dried with hot air using a rotary dryer, and then the pellet-like granules are sized using a sizing machine to form granules with a diameter of about 2 m and a length of about 3 m. .

The above-mentioned pellet-like particles serve as a filtering material.

[Effects of the Invention] According to the present invention, mineral powder produced in large amounts during the crushing process of minerals to obtain granules of appropriate particle size can be easily produced into mineral lumps or granules of a required size. Furthermore, the produced mineral concretion can be made not to disintegrate even when water is added.

In addition, since powdered minerals can be formed and arranged into a compact of any size, it can provide a more effective effect than crushed minerals.

When applied to fields, golf courses, etc., the soil improvement material of Example 2 does not disintegrate and retains its original shape even when water is added due to rain or the like.

Furthermore, when the granules, which are the soil conditioner mentioned above, are left in water, they not only do not disintegrate but also solidify further.Furthermore, even when the granules were taken out and picked by hand, they remained in a firm solid state.

Therefore, when this granule is put into a field or the like as described above, it can maintain the gas phase in the soil well and ensure the bearing capacity of the soil. Furthermore, it is possible to utilize the effective soil improvement effect of zeolite, which is the main component. In this case, it has a large base substitution capacity, water retention capacity, fertilizer retention capacity, etc.

Moreover, the component contained in addition to zeolite is a magnesium compound, which is an effective trace element in the field of agriculture and does not cause any new problems.

As mentioned above, it is extremely important that the granules do not disintegrate even when water is added.If the granules are simply solidified with an adhesion agent, they will immediately disintegrate due to moisture when placed in a field. It returns to its original powder form and becomes sticky, resulting in a lack of gas phase and causing roots to sag. Naturally, if the solidified state can be maintained as described above, such problems will not occur. On the contrary, it is possible to maintain a good gas phase.

The soil improvement material of Example (2) above is almost the same as that of Example (2) except that it is in the form of pellets.

In the case of this example, it is easier to obtain a suitable size with a small diameter than in the case of manufacturing by crushing mineral lumps as in Example ① or the conventional example.
When the material yield is good and the amount is the same, there is an additional advantage that it can be granulated into small diameter pellets with a large surface area as a whole.

When used as litter for cats, for example, the bed litter of Example 1 has good water absorption and deodorizing properties, and hardly disintegrates even with water such as urine. On the contrary, it increases the degree of solidification. Therefore, it is easy to remove only the particles that have absorbed urine, making it an effective bed litter.

The filter material of Example 3 above is made by molding diatomaceous earth, which has become powdered and becomes unusable, into pellet-like granules that do not disintegrate with water, making it possible to effectively utilize the powdered diatomaceous earth. be. Similar to the above-mentioned example, the pellet-like particles tend to further increase the degree of solidification when not placed in water, and there is almost no possibility of them collapsing.

Claims (1)

[Claims] 1. A method for solidifying powdered minerals, which comprises adding and mixing a magnesium oxide material to powdered minerals and pressurizing the resulting mixture to solidify it. 2. Powder in which a magnesium oxide material is added and mixed with powdered minerals, the resulting mixture is pressurized and solidified, and the resulting solidified material is crushed to produce solidified material granules. Method of consolidation of body minerals. 3. A method for solidifying powdery minerals, which comprises adding a magnesium oxide material and an adhesion auxiliary material to powdery minerals, adding water and kneading, and drying and solidifying the resulting kneaded product. 4. Consolidation of powdered minerals by adding magnesium oxide material and adhesion auxiliary material to powdered minerals, adding water and kneading, granulating the obtained kneaded material, and further drying and solidifying. Method.