KR100230598B1 - Manufacturing method of particle-size aluminium silicate from kaolinite by high-temperature sintering method - Google Patents

Abstract

The present invention is to separate the fine kaolin and plagioclase (calcite feldspar) and quartz impurity in the mined domestic kaolinite, wet crushed mined kaolinite, and separated by sieving the granulated product of glass more than 325 mesh It is used as a raw material for raw materials, and powders of 325 mesh or less are manufactured by industrial powders, etc., and all methods are used without discarding kaolin containing a lot of impurity minerals like domestic products. The fine powder below 325 mesh was pulverized after magnetic screening to prepare fine powder with average particle size d ₉₀ = 6.2㎛, d ₅₀ = 2.0㎛, which was subjected to high temperature baking at 1,000 ℃ ~ 1,100 ℃, and then fine powder. The surface of the powder is modified with fatty acids (stearic acid, oleic acid, etc.), resin acid, silane, etc. to be made of fillers and physical properties such as PVC, PE, PP, and resin. What has that feature.

Description

Manufacturing method of fine white aluminum silicate powder from kaolin using high temperature firing method

The present invention provides a high-quality aluminum silicide (Al) which improves the physical and chemical properties such as the intrinsic refractive index, dispersibility, and electrical conductivity of kaolin by purifying kaolin in an economical manner and performing high temperature baking and surface modification. ₂ O ₃ -SiO ₂ ) is prepared as a fine powder for general industrial use, or the surface of the powder is modified from hydrophilic to hydrophobic with fatty acids (stearic acid, oleic acid) and resinic acid. The present invention relates to a method of producing fine white aluminum silicate powder from kaolin using a high temperature firing method which can be used as fillers such as PE, PP and various resins, and for improving physical properties.

Basic formulas of aluminum silicate (aluminium-silicate) material is yarn Lima nitro group present in natural minerals (silimamite group), kaolin group (kaolin group) and leaves pyrophyllite (pyrophyllite) and the three kinds of round, kaolin group mineral is Al ₂ It is composed of O ₃ -SiO ₂ -H ₂ O, but the homomorphs according to the crystalline form include kaolinite, halloysite, nacrite, and dickite ( dickite).

Kaolin, a representative mineral of kaolin minerals, is roughly divided into kaolinite, which is a plate-like structure, and halloysite, which has a needle structure, depending on the crystal form. Only a small portion of Kaolinite exists and most of the halosite quality of the bed has been a limiting factor in its use.

In other words, the kaolin clay powder for paper surface coating used in the papermaking industry is used only for the plate-like, and the kaolin clay in the bed is mainly used for ceramics such as ceramics and tiles. In the case of domestic kaolin, in particular, since many impurities are mixed, it cannot be used for high-quality applications, and most of them are used for low value-added applications.

Plate kaolin is representative of hexagonal kaolin, which is typically produced in Georgia in the United States, which increases the volume of products in various industries such as the paper surface coating powder or paint, rubber, and plastic industries. In order to improve the physical properties of the product, or as a filler for various purposes, such as filling powder is widely used.

On the other hand, Korea's needle-like kaolin has excellent coking force and is widely used for ceramics. However, since the technology for use as an industrial filler like the plate-like kaolin has not been developed, its use is not diverse.

The reason for this can be seen from various angles, but it is difficult to use it for high-quality powders without refining because domestic kaolin is not uniform in quality. Due to the large amount of impurity chemicals (Fe ₂ O ₃ , CaO, MgO, TiO ₂ ) mixed, the economic efficiency of kaolin minerals is lowered if the impurities are not removed economically by appropriate techniques and methods. .

Conventionally, various refining techniques for using Korean kaolin have been proposed. Looking at the representative types thereof, a method of removing emulsified minerals (Patent Publication 93-2276), and leaching of leaching iron impurities using strong and weak acids are disclosed. Technology, a purification method by a magnetic screening method using a magnetic screening machine, and the like, and techniques for using kaolin for another use include a method for preparing a bleaching agent from kaolin (Patent Publication 89-2152), and a kaolin derivative (Patent Publication 96-703091). And cohesive mineral pigments (Patent Publication 93-703382), and use technologies such as the production of samot using low quality kaolin (Patent Publication 83-8927), but using high-grade kaolin to overcome the above-mentioned problems. There have been no reports of the development of a technique for producing aluminum silicate fine powder.

In particular, conventionally, when processing raw materials having quartz, plagioclase and other impurities such as kaolin in Korea, due to the lack of economic refining technology of granulated impurities, since they have been simply separated and discarded, It has been a waste of mineral resources, and in particular, it has been a cause of deterioration of the profitability of mines.

Applicant targets kaolin in Korea and abroad, and in order to develop a technology for use in high value-added applications that do not depend on crystal form, even if they are halosite quality kaolin, such as Korean kaolin, By applying the appropriate quality improvement method according to the characteristics, we studied economic treatment method to improve the added value of kaolin. Since it has a needle-like crystal and contains impurities like kaolin in Korea, it is used for high value-added applications. Even for difficult raw minerals and plate-like kaolin, existing raw materials for raw minerals that have low whiteness, high impurity mineral content, and poor physical properties such as concealment rate and dispersibility cannot be used for high-grade purposes. Sorting technology, crushing-crushing-classification technology and quality improvement technician by removing impurities In the case of using the power selection technology, the application of high-precision selective shredding-crushing technology to selectively separate the impurity minerals contained in kaolin, improvement of whiteness by high-temperature firing technology, improvement of concealment rate and improvement of electrical insulation resistivity, etc. By using the existing technology, it is intended to produce a superior high quality functional aluminum silicate (aluminum-silicate) fine powder that cannot be used in the physical properties of a simple purified product.

The kaolin treatment process proposed in the present invention has the advantage of being able to commercialize the granulated impurities contained in the ore into intermediate powder materials, which is very useful in terms of strengthening the competitiveness of related industries and effectively utilizing domestic abundant resources. It is considered a technology.

In other words, according to the present invention, the kaolin is refined in an economical manner, and high-temperature firing and surface modification are performed to improve the physical and chemical properties of the intrinsic refractive index, dispersibility, and electrical conductivity of the kaolin. By preparing (Al ₂ O ₃ -SiO ₂ ) as a fine powder and using it as a general industrial powder, or by modifying the surface of the powder from hydrophilic to hydrophobic with fatty acids (stearic acid, oleic acid) and resinic acid, etc. The present invention provides a method for producing high-grade aluminum silicide powders used as fillers and physical properties of various PVC, PE, PP and various resins.

1 is a manufacturing process diagram of the present invention

Hereinafter, a method of the present invention will be described in detail with reference to the manufacturing process of FIG. 1.

The present invention is to separate the mined domestic kaolinite, pure kaolin and plagioclase (calcite feldspar) and granulated impurity minerals, such as quartz, by separating the sieve by wet crushed mined kaolinite, the powder of more than 325 mesh dehydration, After drying, it is pulverized to less than 325 mesh or suitable particle size according to the purpose, and is made into powder for glass, feed and general industry, and fine particles of 325 mesh or less among the pulverized products of kaolin ore are fine particle size. The fine powder product purified by grinding-magnetic sorting method from d ₉₀ = 6.0 μm to d ₅₀ = 1.5 μm was fired at a high temperature of 1,000 ° C. to 1,100 ° C., and the fatty acid (stearic acid, oleic acid, etc.) was fired on the fired powder sample. ) And the powder surface by modifying the resin surface, silane (silane) and the like to prepare the fine powder to be made of fillers and physical properties such as PVC, PE, PP, resin (resin).

In order to apply such a process, in the present invention, as a halide-grade kaolin, it is recognized as WC grade in the quality standard according to the grade standard of ceramic kaolin, which has a wide use for ceramics (Fe ₂ O ₃ : 0.95 or less, Al ₂ O ₃ ,: more than 38%, SiO ₂ : less than 46%) were analyzed for kaolin in Hadong-Sancheong, Gyeongnam. The chemical composition ratios for these are shown in Table 1 below. The performed example is as follows.

TABLE 1

These kaolins have a high content of coarse impurities such as plagioclase and quartz due to the lack of weathering and alteration at the time of kaolin formation. Therefore, it is very important for the overall utilization and economic feasibility to establish effective utilization of granules.

EXAMPLE

After wet pulverization using the ore (kaolin), the sieves were separated by a sieve sorter set to 325 mesh, as shown in Table-1, as a result of the granulated product of 325 mesh or more 44.90% by weight ratio As a result, it was found that most of the plagioclase contains a lot of CaO.

The granulated product after crushing by using wet scrubbing process has low iron content and whiteness of 87 ~ 88 °, so it is dehydrated without refining process and finely pulverized to less than 325 mesh after drying to be used as general industrial powder. This was possible.

Meanwhile, the domestic kaolin is crushed by the wet method, and the 325 mesh subproducts (particulates) by sifting have a high iron content as Fe ₂ O ₃ : 0.97, as shown in Table-1. In the case of domestic kaolin, it is due to the high iron content and the content of clay-based impurity minerals (illite, chlorite, etc.), and it is difficult to use the refining process to increase the added value by refining domestic kaolin. It is also there.

In this embodiment, the particle size of the product is finely pulverized by a wet mill or attrition mill in order to improve the purification efficiency by magnetic screening and to produce the fine powder product, and d ₉₀ = 6.0 μm-d ₅₀ = 1.5 μm. Purification was carried out using a general purpose wet magnetic separator, and the recovery rate of the purified product was 93.49%, and the iron content was reduced from Fe ₂ O ₃ : 0.97 to 0.65, thereby improving the whiteness from 82 ° to 85 °. It became.

The purified product was subjected to high temperature firing after dehydration and drying, and the whiteness could be improved from 85 ° to 91 ° by controlling the firing temperature from 1,000 ° C. to 1,100 ° C. without controlling the minor component atmosphere.

The calcined powder sample is hydrophilic to hydrophobic surface modified with fatty acids (stearic acid, oleic acid, etc.), resin acid, silane, etc., and then miscible with PVC, PE, PP and various resins. Technology was used to enhance the activity.

The physical and chemical properties of the product (2) prepared through these steps have excellent physical properties as shown in Table 2 below. These products could be used for filling and improving properties such as resin.

TABLE 2

Wet Magnetic Separation Effects and Physical and Chemical Properties of Final Products

As described above, the use of kaolin in the present invention was very limited, and the domestic intermediate kaolin was manufactured into high-quality ultrafine powder required in various industrial fields using processes such as refining, physical properties, and fine grinding. As a result, the added value and utilization rate of domestically-occupied resources can be greatly improved, and their fine powder products include various basic industries (glass industry, paint industry, rubber industry, plastic industry) and PVC, PE, PP and various resins. As a very economical and effective method, which can be used as a filler and a material improving material, has the advantage that can be utilized in the entire field of resources and materials industry.

Claims (1)

(Correction) In the separation of mined domestic kaolinite from pure kaolin, plagioclase (calcite feldspar) and quartz, etc., the mined kaolinite is wet-pulverized and separated by magnetic separation and pulverized. A fine powder of ₉₀ = 6.2 μm, d ₅₀ = 2.0 μm was prepared, which was calcined at high temperature at 1,000 ° C. to 1,100 ° C., and then fatty acid (stearic acid, oleic acid, etc.), resin acid, silane, etc. Method for preparing high white aluminum silica fine powder from kaolin using high temperature firing method characterized in that the surface of the powder is modified to be made of fillers such as PVC, PE, PP and resin, and physical properties. .

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