KR100461563B1 - A method for crashing of water containing material and an apparatuse thereof - Google Patents

Abstract

The present invention relates to a method and apparatus for crushing water-containing compounds and natural products, and more particularly, to have the greatest influence in terms of physical properties and quality of water-containing products during the manufacturing or processing of water-containing compounds or natural products. By simultaneously integrating the drying process and the grinding process, the process can shorten the process time compared to the conventional method of separating the grinding and drying process, thereby improving productivity, controlling the particle size of the grinding product, and controlling the physical properties of the grinding product. A method and apparatus for milling compounds and natural products containing moisture that are economical and efficient that can prevent changes.

Description

A method for crashing of water containing material and an apparatuse

The present invention relates to a method and apparatus for crushing water-containing compounds and natural products, and more particularly, to have the greatest influence in terms of physical properties and quality of water-containing products during the manufacturing or processing of water-containing compounds or natural products. By simultaneously integrating the drying process and the grinding process, the process can shorten the process time compared to the conventional method of separating the grinding and drying process, thereby improving productivity, controlling the particle size of the grinding product, and controlling the physical properties of the grinding product. A method and apparatus for milling compounds and natural products containing moisture that are economical and efficient that can prevent changes.

Although the grinding method of crushing solid particles varies depending on the nature, purpose, and particle size of the raw materials to be crushed, the external force applied to the particles for grinding purposes is usually one of mechanical forces combined with compression, shear, or impact. As an extremely special grinding method, grinding may be performed by thermal stress or ultrasonic waves inside the particles.

The material to be crushed is varied, such as ore, cement raw materials, coal, clinker, chemical raw materials, medicines and food.

Types of mills generally used for milling include ball mills, rod mills, roller mills, and wheeler mills.

Ball mill is a device that crushes materials by impact by steel ball movement by putting steel balls in a cylinder with several materials and rotating them.The ball mill is made of raw materials such as cast iron, lacquer casting, flint stone, and natural stone. There are various types, and the length of the cylinder is standard type, which does not exceed the diameter, but there are various kinds of tube mills, which are several times the diameter, and compound mills in the middle, and the inner surface of the cylinder is made of special steel or Built in nickel plate. It is used to make final fine powder. In case of fine powder such as clay and dyes, it is used as dry powder and its use is very wide.

A rod mill is a rotary mill using a steel rod slightly shorter than the inner surface of the gas as a grinding medium, and selectively grinds from coarse particles, and has a characteristic of obtaining a grinding product having a relatively uniform particle size. In addition, it is often used as a pre-mill for grinding by a ball mill.

The roller mill is a ball mill grinder with the same principle as the ball mill. It is used to grind cement materials or coal. The roller mill is also used as a ring roller mill.

Wheeler mills are widely used in applications that require fine grinding of several micrometers or less, and are a type of fluid energy mill, which is used to blow particles into a wall of a machine or to other particles by blowing high pressure gas. As an apparatus, a gas refluxs an elongated donut-shaped cabin with the particles, and only fine particles are discharged to the outside with the exhaust.

Besides, there are gyratory crusher and cone crusher by compression force, hammer mill, cage mill, fluid energy mill by shear force, crusher by shear force, There are natural grinding mill, vibrating mill, planetary mill and stirring mill by grinding force.

The cellulose ether is specifically described as an example of a compound including a conventional grinding process as follows.

Cellulose ether refers to alkyl cellulose, hydroxyalkyl cellulose, hydroxyalkyl alkyl cellulose, etc., which is an industrially useful compound used as a thickener, binder, and repair agent in medicine, construction, paint, etc., methyl cellulose, ethyl cellulose, etc. , Hydroxyethyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl ethyl cellulose and carboxymethyl cellulose.

Generally known pulverization method of cellulose ether is as follows.

Filtration of cellulose ether prepared by reacting caustic soda with finely pulverized pulp followed by alkylene oxide and alkyl halide, followed by pulverization in three steps according to German Patent No. 952,264. Negative cellulose ether is pulverized with a hammer mill and then dried using a circulating air dryer, but the method has a problem in that the deformation of the product is large because the process is complicated and the viscosity of the product is too great.

According to U.S. Patent No. 4,044,198, there is provided a method of applying the impact using liquid nitrogen to pulverize cellulose ether first and then pulverizing again, but this is a non-economically decisive problem because a process using liquid nitrogen is added.

According to US Pat. No. 4,076,935, a vibratory grinder is used to obtain fine particles of cellulose ether. This is because the viscosity decrease of the product is too large, for example, the viscosity before grinding is lowered to 32,000 CPS product to 12,000 CPS, there is an inefficient disadvantage that can not obtain the desired product.

According to US Pat. No. 4,415,124, there is provided a method of obtaining fine particles in a two-step grinding process, using a vibrating or ball mill equipped with a cooling device. This is a problem of economical due to the large decrease in viscosity of the product and less throughput per unit time.

As described above, the general method of pulverizing cellulose ether is commercially disadvantageous to be dried after crushing the product through a predrying process and a preliminary crushing process. Although the particle size decreases, the apparent specific gravity is low and the viscosity decrease is large, and the grinding with a batch vibratory mill and a ball mill is a method that is difficult to apply commercially because the particle size is small and the apparent specific gravity is large. .

Therefore, there is an urgent need for a method of solving the above-mentioned problems, which is difficult to obtain a desired product because the process takes a long time and the deformation of the physical properties such as the viscosity of the product is large because it is pulverized and dried through several steps.

Accordingly, the inventors of the present invention have conducted research in order to improve the above problems, thereby reducing the time required for the process and minimizing physical property deformation such as viscosity reduction of the product by simultaneously performing grinding and drying by hot air containing moisture. The present invention was completed by knowing.

Accordingly, the present invention provides an improved grinding method and a grinding apparatus that can shorten the time required for the process and minimize the modification of physical properties by simultaneously performing the grinding and drying processes in the manufacturing and processing of water-containing compounds and natural products. The purpose is to provide.

Figure 1 schematically shows an embodiment of the grinding apparatus used in the present invention.

FIG. 2 is an enlarged cross-sectional view of part 15 of FIG. 1.

[Description of Major Symbols in Drawing]

10: body portion 12: fixed grinding frame 14: grinding rod

15: Ventilation unit 16: central rotation axis 18: collecting unit

20: tooth 22: inlet 24: drive motor

26: Particles crushed

The present invention relates to a method for pulverizing a compound or natural product containing water, comprising: 1) a grinding object is heated at a mechanical transfer means and a grinder inlet, and heated air having a flow rate from the inlet of the grinder to the center of the grinder along the pipe; Transported; 2) the conveyed grinding object is pulverized step by step from the lower end of the crusher by the friction generated by the flow between the grinding rod rotating around the axis of rotation of the crusher and the fixed grinding wheel located on the inner wall surface of the crusher; And 3) the grinding object is transferred between the ventilation unit and the grinding wheel in the center of the grinder and the grinding rod mounted in the vertical direction of the outer diameter surface of the rotary shaft according to the movement of the heated air and dried and pulverized from the bottom of the grinding rod. Characterized by the method of grinding a compound or natural product containing water comprising the step.

In addition, the present invention is a grinding device for a compound or natural product containing water, the body portion having a predetermined volume (10); A fixed grinding mold 12 having teeth 20 on an inner diameter surface thereof and having a plurality of circulation holes formed therethrough and mounted inside the body portion 10; An inlet 22 formed at one side of the lower end of the body portion 10 so as to communicate with the inside of the fixed grinding frame 12; A rotating shaft 16 mounted in the vertical direction at the center of the fixed grinding frame 12 and rotatably connected to the motor 24; A plurality of crushing rods 14 integrally mounted at equal intervals along the up-down direction on the outer diameter surface of the rotating shaft 16; A ventilation part 15 communicating with a circulation hole of the fixed grinding frame 12 and formed in a space between an inner diameter surface of the body portion 10 and an outer diameter surface of the fixed grinding frame 12; It is characterized in that the crushing device consisting of a collecting unit 18, which is mounted in communication with the interior of the fixed grinding frame 12, the upper portion of the body portion 10 to collect the particles pulverized to a predetermined particle size.

Hereinafter, the present invention will be described in more detail.

The present invention is carried out simultaneously by efficiently integrating the drying process and the grinding process that has the greatest impact on the physical properties and quality of the water-containing product in the process of manufacturing or processing the compound containing water or natural products, and the conventional grinding and The process time can be shortened compared to the method of drying separated, improving the productivity, controlling the particle size of the pulverized product at the same time, reducing the time required for the process and drying by the heated air at the same time. It is a grinding method that can prevent changes in physical properties.

The present invention will be described in more detail with reference to the accompanying drawings.

The material containing a certain amount of water to be pulverized is transferred to the inlet 22 of the grinder by a conventional mechanical conveying means, and with this mechanical conveying force, the material is passed through the air heater at the inlet 22 of the grinder. The hot air flow, given the temperature and the flow rate, is transferred to the center of the mill in which the central rotating shaft 16 is located.

The water content of the target pulverized product containing water that can be used in the grinding method of the present invention is 30 to 80%, and when the water content exceeds 80%, there is a problem in that transfer by air is impossible due to excessive water content.

This allows the material containing water to be simultaneously transferred into the grinder by means of air having a flow rate along with the mechanical conveyance by the conveying means, thereby preventing the phenomenon of fusion and agglomeration when only the mechanical conveying means is applied. In order to impart smooth fluidity, an additional effect of preventing the crushed matter from adhering to the crushing driving part is generated.

Moisture-containing material introduced into the grinder by mechanical conveying and heated air is transferred between the grinding rod 14 and the fixed grinding mold 12 mounted on the rotary center shaft 16 of the grinder rotating by the drive motor 24. While passing through several times, the water-containing materials are crushed by the forces and frictional forces generated by collision with each other, and the frictional force generated between the water-containing material and the fixed grinding frame 12 and the grinding rod 14. At this time, if the fixed grinding mold 12 used is sawtooth type, the grinding effect becomes large.

As described above, the frictional force generated while repeatedly circulating between the fixed grinding mold 12 and the grinding rod 14 and the collision between the water-containing material 9 and the water-containing material 9 as described above. The material 26 to be crushed is relatively roughly pulverized, so that the particle size is not uniform, so that the particle size is small and movable by air flow is transferred to the upper part of the crusher and collected in the collecting unit 18, and the pulverization is sufficiently performed. Since the material having a large particle size does not proceed, the material is introduced into the ventilation part 15 located on the outer surface including the fixed grinding frame 12 by rotating air, and then sufficient grinding is performed by the grinding rod 14.

That is, by adjusting the number of pulverizations occurring between the ventilation unit 15, the fixed pulverization frame 12, and the pulverized rod 14, a product having a desired particle size can be obtained, and the number of repetitions is one or more times. In the case of the present invention, by controlling the number of grinding to about 1 to 7 times, the desired particle size range (average particle size 110 ~ 130 ㎛) and the moisture content (0.5 ~ 2.0%) can be obtained, At the same time, the product ground to have a uniform size is moved to the product collecting section 18 by the air flow.

At this time, the temperature of the air imparting fluidity to the material to be pulverized can be controlled by the automatic control heater according to the water content of the desired product, and the particle size of the product is the speed of the conveying means of the inlet 22 of the material The flow rate of the air and the rotational speed of the central rotary shaft 16 inside the grinder and the number of grinding can be adjusted.

The pulverized product, which is crushed into a product having a uniform uniform particle size, is stored in a hopper after passing through a cyclone, and classified by a vibrating sieve machine to produce a product having a desired particle size.

According to the method of the present invention as described above, the water-containing material can be simplified and the complicated process consisting of several steps, which was a problem of the prior art by drying with hot air at the same time, thereby improving productivity. In addition, it is possible to minimize the change in physical properties that occur when the moisture-containing material is left for a long time to produce a product having excellent physical properties.

Most of the artificially produced compounds and natural products contain constant water, and various physical properties change due to the chemical reaction and the action of microorganisms caused by the water.

Therefore, regardless of the compound and natural products, water-containing substances such as foods such as bread flour, powdered dairy products, teas and seasonings, medicines such as herbicides and pest control agents, and water used throughout the industry such as animal feed and chemical raw materials The method of the present invention can be applied to the grinding and drying process of a material containing

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the Examples.

Examples 1-5

Caustic soda was injected into the finely ground pulp, and the cellulose ether prepared by reacting alkylene oxide and alkyl halide was washed with hot water and filtered. After filtration, cellulose ether having a water content of 20 to 70% was transferred to the center of rotation of the grinder with air having a temperature of 90 to 95 ° C. and a flow rate of 1 to 10 m / sec. The transported cellulose ether particles were pulverized while circulating with heated air between the pulverized rod rotating at 8,000 to 15,000 rpm and the ventilation part inside the fixed mill.

The results of comparing the initial moisture content and initial viscosity of the cellulose ether used, the inlet velocity into the grinder, the apparent specific gravity and the like before and after grinding are shown in Table 1 below.

Comparative Examples 1 to 3

The same process as in Example, but was carried out by changing the type of grinder, the results are shown in Table 2 below.

Test Example

<Viscosity of 2 parts by weight aqueous solution>

After stirring about 500 ml of a 2 parts by weight aqueous solution mixed with 2 parts by weight of dried cellulose ether with respect to 100 parts by weight of hot water of 90 ° C. or more for about 30 minutes, the solution was cooled to 20 ° C. and then Brookfield Viscometer DV-III was used. It was measured by.

<Apparent specific gravity>

The dry cellulose ether was measured as a ratio of weight difference before and after filling after filling with a funnel in a cylindrical tube having a constant weight and a constant volume.

As shown in Table 1, the cellulose ether pulverized and dried according to the embodiment of the present invention showed little change in viscosity before and after pulverization, so that deformation of physical properties hardly occurred. In the comparative example using the conventional pulverizer shown in 2 it can be seen that the viscosity after pulverization is reduced up to 60% of the initial viscosity to cause deformation of physical properties.

In the case of cellulose ether, when the viscosity is lower than the viscosity determined during synthesis, a defective product that does not meet the standard is produced, which causes economically disadvantageous results due to loss of production. The cellulose ether prepared by the method of the present invention has a viscosity change. Since there is virtually no defect rate described above, the production efficiency is increased, thereby preventing problems caused by viscosity decrease.

In addition, the water content before and after pulverization was 0.85 to 1.51% in the case of the embodiment of the present invention, 1.57 to 2.51% in the comparative example was dried in a short time, but it can be seen that the degree of drying is excellent.

The apparent specific gravity is a property that indicates the degree of weight or weight per unit volume of the product compared to water having a specific gravity of 1. The specific gravity of the product prevents the scattering of the product powder and gives ease of packaging. In general, 0.3 to 0.45 or less is preferable as it has an important meaning in relation to the process operating efficiency, and examples and comparative examples of the method of the present invention are almost similar. Thus, cellulose ethers are prepared using the method of the present invention. It can be seen that the characteristics of the apparent specific gravity can be satisfied.

In addition, it can be seen that the quality of the cellulose ether pulverized and dried by the method of the present invention, such as the average particle size uniformly 110 to 130 μm, is superior to the cellulose ether pulverized and dried by the conventional method.

As described above, according to the method of the present invention is composed of a multi-step in the method of crushing and drying the water-containing material to improve the problems of the prior art disadvantageous economically and time to complete the process of integrating the grinding and drying process It is possible to improve productivity and bring economically advantageous technical progress, and to obtain a product with high stability in terms of quality by minimizing deformation of the product during grinding and drying.

Claims (4)

In the grinding method of a compound or natural product containing water, 1) the grinding object is transferred from the inlet of the grinder to the center of the grinder along the pipe by heating air having a flow rate by heating at the mechanical conveying means and the grinder inlet; 2) the conveyed grinding object is pulverized step by step from the lower end of the crusher by the friction generated by the flow between the grinding rod rotating around the axis of rotation of the crusher and the fixed grinding wheel located on the inner wall surface of the crusher; And 3) The grinding object is transferred between the ventilation unit and the grinding wheel in the center of the grinder and the grinding rod mounted in the vertical direction of the outer diameter of the rotary shaft according to the movement of the heated air, and dried and pulverized from the bottom of the grinding rod. Method for grinding a compound or natural product containing water, characterized in that comprises a. The method of pulverizing a compound or natural product according to claim 1, wherein the initial moisture content of the grinding object is 30 to 80%. The method of claim 1, wherein the third step is performed 1 to 7 times repeatedly. Claims [1] A grinding device for compound or natural product containing water, the apparatus comprising: a body portion 10 having a predetermined volume; A fixed grinding mold 12 having teeth 20 on an inner diameter surface thereof and having a plurality of circulation holes formed therethrough and mounted inside the body portion 10; An inlet 22 formed at one side of the lower end of the body portion 10 so as to communicate with the inside of the fixed grinding frame 12; A rotating shaft 16 mounted in the vertical direction at the center of the fixed grinding frame 12 and rotatably connected to the motor 24; A plurality of crushing rods 14 integrally mounted at equal intervals along the up-down direction on the outer diameter surface of the rotating shaft 16; A ventilation part 15 communicating with a circulation hole of the fixed grinding frame 12 and formed in a space between an inner diameter surface of the body portion 10 and an outer diameter surface of the fixed grinding frame 12; Crushing apparatus, characterized in that the upper portion of the body portion 10 is mounted in communication with the interior of the fixed grinding frame (12), collecting part (18) for collecting the particles pulverized to a predetermined particle size.