KR101179883B1 - Manufacture method and apparatus for casting sand - Google Patents

Abstract

The present invention relates to a method for manufacturing a foundry sand, an apparatus and a foundry sand for manufacturing a finishing slag generated during a smelting or beneficiation process of nickel ore through a polishing process.
Drying the finishing slag generated during smelting and beneficiation of nickel ores; Cooling the dried filamentous slag to room temperature; Spheroidizing the filamentous slag cooled to room temperature; Classifying the spherical products by particle size to produce a primary product; Crushing filamentous slag that has not been commercialized in the first production step; Classifying the crushed finishing slag by particle size into a second product and a rotary dryer (2); Rotary cooler (3); Vibrating Screen 4; Rotary MMR (taste machine) 5; Round screen 6; It is characterized by being composed of a crusher (Mill) (7).

Description

Foundry sand manufacturing method and apparatus and casting sand {MANUFACTURE METHOD AND APPARATUS FOR CASTING SAND}

The present invention relates to a method for manufacturing a foundry sand, an apparatus and a foundry sand, and more particularly, a foundry sand for manufacturing a finishing slag generated in the process of smelting nickel or beneficiation through a grinding process. The present invention relates to a manufacturing method, apparatus, and foundry sand.

In general, casting refers to casting a molten metal into a mold and solidifying it to make a metal product of a desired shape.In the case of casting, it is classified into cast iron castings, aluminum alloy castings, copper alloy castings, etc. It is usually classified according to the inflow method of molten metal.

The material of the mold is a mold made by sculpting molding sand, a metal made of steel, etc., and a mixture of sand made of particles of synthetic resin that hardens when heated. There are many kinds such as shell mold making mold, and each is divided into sand casting, mold casting and cell mold.

Hereinafter, the conventional technologies will be described with reference to the foundry sand as follows.

The Republic of Korea Patent Publication No. 10-2004-31507 is a semi-automatic manufacturing process of the sand casting casting to solve the inconvenience of the conventional manual casting of casting, that is, to solve the inconvenience of flipping the mold frame was made by manual of course of casting The casting manufacturing apparatus which improves the convenience of casting manufacturing by making it possible to reuse the casting sand by evenly distributing water to the casting sand separated from the mold frame while improving the dimensional precision is disclosed.

Korean Laid-Open Patent Publication No. 10-2005-93152 discloses a foundry sand crushing apparatus for removing the foundry sand in order to take out the product in a process of forming a mold by molding sand and injecting molten metal to produce a foundry product. It consists of a cylindrical sliding member installed, and a crusher for crushing the molding sand of the frame mold installed so that the sliding member can be lifted up and down to maximize the crushing effect to increase the recovery rate of the molding sand and the crushing tool is composed of a single assembly type crushing tool The present invention discloses a foundry sand crushing device having an advantage such that the replacement tool can easily increase the replacement convenience and at the same time replace the crushing tool to be lightweight, thereby improving the safety of the operator.

Korean Patent Laid-Open Publication No. 10-2005-88114 discloses a casting sand composed of Al ₂ O ₃ and SiO ₂ as a main component by the flame melting method to produce a molding sand having a high spherical shape and a low moisture absorption rate, and thus excellent strength. And a spherical casting sand for producing a mold having a smooth and smooth surface and a method of manufacturing the same.

Republic of Korea Patent Application Publication No. 10-2000-31069 relates to a waste molding sand recycling apparatus for pulverizing the sand mold used in the casting process to peel the caking material attached to the sand surface for reuse as a substitute for the new gentleman In more detail, in the dry regeneration method, a frictional reclaimed waste sand regeneration apparatus for regenerating surface attachments by inducing radial friction and circumferential friction between sand particles, the present invention includes: a hopper for storing crushed sand; The cup-shaped cylindrical body, which is mounted on the lower portion of the hopper to give centrifugal force to the sand supplied from the hopper, causes radial friction, and is located at the center of the cup-shaped cylindrical body so that the flow of air flows in a radial direction. A mechanical fan to smoothly circulate; A hat-shaped friction generating body which is wrapped around the cup-shaped cylindrical body to induce circumferential friction; A vertical electric motor for rotating the cup cylinder; A rotary friction type waste casting regenerator including a discharge chute for collecting and transporting sand passed between the cup-shaped cylindrical body and the hat-shaped friction generating body is disclosed.

Korean Patent Laid-Open Publication No. 10-1998-19918 uses a refractory particle such as silica sand as aggregate to add a curing agent to a mold material to which a sodium silicate solution is added as a caking agent, and then agitates, molds, and hardens to increase the strength of the mold. The present invention relates to a method of manufacturing a hard mold, and as a curing agent, 2CaO Al ₂ O ₃ ? Powder processed by blast furnace slag composed of SiO ₂ as a main component and composed of CaO: 30 to 60%, SiO ₂ : 10 to 35%, Al ₂ O ₃ : 10 to 20%, and MnO: 5 to 20% by weight. A method for producing a mold by using a hard-forming mold material using blast furnace slag added with 10 to 80% to a sodium silicate solution is described.

As mentioned above, as a casting sand, conventionally, silica sand is widely used, and since silica sand is a mineral product, its shape is indeterminate, lacks fluidity, and is poor in filling. For this reason, the surface of the mold which consists of a silica sand is rough, and therefore the surface of a casting (casting) is rough, and the load on the grinding | polishing process which is a post process becomes large. In addition, quartz, which is a constituent mineral of silica sand, is crystal-transformed into cristobalite by heat load during casting and collapses due to volume change at that time, so silica sand has low regeneration efficiency as foundry sand. As a means of solving these problems, spherical casting sand (for example, Unexamined-Japanese-Patent No. 4-367349), high siliceous spherical casting sand, and its manufacturing method (Japanese Unexamined-Japanese-Patent No. 5-169184) are disclosed. These granulate the raw material composition into a sphere and then fire in a rotary kiln or the like.

As such, silica has excellent heat resistance and high hardness, so it is widely used for various castings, but development of casting sand is required to replace it due to resource depletion. In accordance with these demands, the technology to solve the problem of shortage of silica sand and to manufacture the foundry sand by grinding the finishing slag generated in nickel ore smelting and beneficiation process with a Trough polisher is provided. It is published in 183933.

Accordingly, in the present invention, the finishing slag generated by smelting or beneficiation of nickel ore is subjected to abrasion treatment to be manufactured as a foundry sand.

In other words, during the smelting process of nickel ore, the lead slag discharged after mixing leadless or limestone with nickel ore and refining in rotary kiln and performing powder and beneficiation is SiO ₂ (50%), MgO suitable as foundry sand. (35%), Fe, Al, etc. (15%), and thus, the present invention intends to manufacture sand slag generated in the smelting process of nickel ore by casting sand in a more efficient and productive manner.

The present invention to solve the above problems;

According to the invention described in [claim 1]; Heating the nickel ore through the crusher and the filter in a rotary kiln, crushing the crusher in a pulverizer, and then sorting nickel in the specific gravity and magnetic magnetizers to obtain finishing slag; Drying the filamentous slag obtained in the above step at a moisture content of 0.02% at a temperature of 150 to 160 ° C. in a rotary dryer; Cooling the finishing slag dried in the rotary dryer to room temperature in a rotary cooler; Spheroidizing the cooled filamentous slag in a rotary mill (taste machine); Producing a primary product by selecting filamentous slag that is finished in the reclaimer by spherical size on a round screen; Crushing the remaining filamentous slag with a large particle size not commercialized as the primary product in a mill; The crushed filamentous slag is characterized in that the step consisting of producing a secondary product by screening by particle size in a round screen (Round Screen).

According to the invention described in [claim 2]; According to claim 1, After the step of cooling the finishing slag dried in the rotary dryer to room temperature in a rotary cooler (Vibrating Screen) in the vibrating screen (Vibrating Screen) to classify the finishing slag large enough to be difficult to crush the particle size and the crushing operation is possible It is characterized by consisting of the step of selecting only the slag of filament.

According to the invention described in [claim 3]; A rotary dryer for drying filamentous slag of about 8% moisture at a moisture content of 0.02% at 150 to 160 ° C; A rotary cooler for cooling the finishing slag dried in the rotary dryer to room temperature; A vibrating screen for classifying filamentous slag having a large particle size so that crushing operation is difficult, and for sorting filamentous slag of crushable size; A reclaimer (Rotary MMR) which spheroidizes the selected filamentous slag; A round screen for producing a primary product for sorting the finished slag by the particle size after the visualization process; It is characterized by consisting of a crusher (Mill) for crushing the remaining filament slag large particle size that is not the primary product.

According to the invention described in [claim 4]; The method of claim 3, wherein the reclaimer; Shelf (Self) for spheroidizing slag input from the upper hopper inside the housing) is installed on the drum, the drive shaft of the drum is interlocked with the drive motor and the circumferential direction in the grinding chamber in which the slag is received in the shelf. The dog wings are characterized by being arranged at an inclination angle of 60 degrees.

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The present invention can solve the problem of resource shortage and silica sand by recycling the slag produced during the process of smelting or beneficiation of nickel ore into foundry sand,

The finishing slag generated in the process of smelting or beneficiation of nickel ore can be manufactured and recycled by foundry sand in a more efficient and productive way, which can have significant economic benefits.

1 is a process chart showing the overall process of the present invention.
2 is a block diagram of a reclaimer in the present invention.
3 is a schematic diagram illustrating the extract of FIG. 2.

The present invention is to manufacture the filamentous slag generated in the process of smelting, beneficiation of nickel ore by foundry sand.

The filamentous slag generated during smelting and beneficiation of nickel ore is collected in a storage warehouse and transferred to a rotary dryer for drying.

The finishing slag dried in the rotary dryer classifies the finishing slag having a large particle size to the extent that it is difficult to crush after cooling in a rotary cooler, and selects only the finishing slag of the particle size that can be crushed to be a reclaimer (Rotary MMR) Transfer to) and work on taste.

The filamentous slag selected above is spheroidized in a reclaimer so that the particles have irregular shapes and poor fluidity and poor filling properties, so that the filamentous slag has a shape suitable for casting sand.

After finishing the spheroidization work in the reclaimer, the finishing slag is first classified by particle size on the screen to produce a primary product.

The filamentous slag classified in the primary classification process is transferred to a crusher (mill) and crushed, and then classified by particle size on the screen to produce a secondary product.

Hereinafter, the embodiments of the present invention will be described in detail.

1 is an overall process diagram of the present invention, Figure 2 is a block diagram of a reclaimer in the present invention.

Nickel ore that has passed through the crusher, filter, etc. is heat-treated in rotary kiln, etc., after water crushing, crushed again in the crusher, and the nickel is sorted in the specific gravity magnetizer and the magnetic blast furnace, and the finishing slag is used as a raw material.

      Unlike slag obtained by rotary kiln method of silicon nickel or the like, unlike slabs used in electric furnaces, furnaces, etc., slag is not completely vitrified in a semi-melt state, and thus slag having a significant particle size distribution as a casting sand can be obtained by crushing. have.

The slag (containing about 8% water) obtained in the above process is transferred from the storage warehouse 1 to the rotary dryer 2 and dried at a moisture content of 0.02% at 150 to 160 ° C.

The finishing slag dried in the rotary dryer 2 is cooled to room temperature in the rotary cooler 3 and sorted in a vibrating screen 4.

The vibrating screen 4 sorts the filamentous slag with a large particle size so that the crushing operation is difficult, and selects only the filamentous slag of the particle size that can be crushed.

The finishing slag selected in the Vibrating Screen (4) is then transferred to a storage warehouse (9) for visualization and sorting work for commercialization, and a reclaimer (Rotary MMR; US) in the storage warehouse (9). (5) to carry out the visualization work.

The selected filamentous slag is spheroidized in the reclaimer 5 because the particles are not suitable as a casting sand, for example, the particles are irregular and lack fluidity.

The finishing slag that has been selected and spheroidized in the reclaimer 5 is sorted by particle size (lake) in a round screen 6 as shown in Table 1 below to produce a primary product and have a large particle size that is not commercialized. The remaining finishing slag is crushed in a mill 7.

division
Particle Size Distribution? Mesh?% Particle size index 14 20 28 35 48 65 100 150 200 270 PAN AFS GFN No. 4 0.3 16.8 64.4 17.8 0.6 0.2 tr 20.2 32.9 No. 5 0.4 0.4 2.0 46.0 41.2 7.8 1.6 0.4 0.2 tr 36.5 57.6 No. 6 tr 1.6 15.2 37.8 31.4 11.8 1.6 0.4 0.2 62.9 111.2 No. 7 tr 4.4 35.2 30.8 20.2 9.3 149.9 276.2

In the above process, the work of the rotary MMR 5 which spheroidizes the finishing slag affects the strength of the foundry sand. The construction of the reclaimer 5 will be described below. .

The reclaimer 5 is provided on the drum 54 with a shelf 53 for spheroidizing by crushing and grinding the finishing slag introduced from the upper hopper 52 into the housing 51.

And the drum (54) provided with the shelf 53 is driven by the drive shaft 55 is rotated in conjunction with the drive motor 56 to grind the grinding slag introduced from the upper hopper 52 to form a spheroidized work.

The shelf 53 is formed with a grinding chamber 531 in which finishing slag fed from the hopper 52 is accommodated, and several wings 532, 532 ′ are formed in the grinding chamber 531 in the circumferential direction. The blades 532 and 532 'are arranged at four angles in the circumferential direction as shown in the example, and are configured with an inclination angle α of 60 °.

The vanes 532 and 532 'of the shelf 53 uniformly stir the filamentous slag particles in the grinding chamber 531 by the rotational force, and also friction between the particles with a strong friction force to grind and shape the filamentous slag.

The finishing slag in which the spheroidizing operation is performed is discharged through the discharge port 57 in the lower portion of the drum 54 and transferred to the round screen 6.

Finishing slag after the visualization process in the reclaimer (5) is sorted by particle size in a round screen (Round Screen) 6 to produce the primary product to the product warehouse (8), the idea that has not been commercialized in the process The slag is crushed in the crusher (7), and then again on the round screen (6) to produce a secondary product by sorting by particle size as in the first productive process.

Foundry sand of the present invention prepared through the above process alone or mixed with other known foundry sand or refractory aggregate such as silica sand, or an inorganic binder such as clay, water glass, silica sol, or an organic binder such as phenol resin, polyphenol resin And may be molded according to known methods using the desired casting mold.

The foundry sand composed of the spherical foundry sand of the present invention and a known foundry sand of the foundry sand can be suitably used for casting applications such as cast steel, cast iron, aluminum, copper, and alloys thereof, and can also be used as a filler for metals, plastics, and the like.

Looking at the symbols used in the accompanying drawings to explain the specific embodiments of the present invention are as follows.
1: Sand Storage 2: Rotary Dryer
3: Rotary Cooler 4: Vibrating Screen
5: Rotary MMR (Taste) 6: Round Screen
7: Mill 8: Product Storage
9: storage warehouse

Claims (5)

Heating the nickel ore through the crusher and the filter in a rotary kiln, crushing the crusher in a pulverizer, and then sorting nickel in the specific gravity and magnetic magnetizers to obtain finishing slag;
Drying the filamentous slag obtained in the above step at a moisture content of 0.02% at a temperature of 150 to 160 ° C. in a rotary dryer;
Cooling the finishing slag dried in the rotary dryer to room temperature in a rotary cooler;
Spheroidizing the cooled filamentous slag in a rotary mill (taste machine);
Producing a primary product by selecting filamentous slag that is finished in the reclaimer by spherical size on a round screen;
Crushing the remaining filamentous slag with a large particle size not commercialized as the primary product in a mill;
The method of producing a foundry sand comprising the step of producing the secondary product by selecting the crushed finishing slag by the particle size in a round screen (Round Screen). The method of claim 1,
After cooling the finishing slag dried in the rotary dryer to room temperature in a rotary cooler, classify the finishing slag with a particle size that is hard to be broken in a vibrating screen and selecting only the finishing slag having a particle size that can be crushed. Foundry sand manufacturing method characterized in that it further comprises a step. A rotary dryer (2) for drying filamentous slag of about 8% of moisture at a moisture content of 0.02% at 150 to 160 ° C;
A rotary cooler (3) for cooling the finishing slag dried in the rotary dryer (2) to room temperature;
A vibrating screen 4 for classifying filamentous slag having a large particle size so that crushing is difficult, and for sorting filamentous slag of a crushable size;
A reclaimer (Rotary MMR) 5 which spheroidizes the selected filamentous slag;
A round screen 6 for producing a primary product for sorting the finished slag by the particle size after the visualization process;
Foundry sand manufacturing apparatus, characterized in that consisting of a crusher (Mill) (7) for crushing the remaining finishing slag having a large particle size that is not the first product. The method of claim 3, wherein
The reclaimer (5); A shelf 53 for spheroidizing finishing slag introduced from the upper hopper 52 is installed on the drum 54 in the housing 51, and the driving shaft 55 of the drum 54 is a driving motor. Manufactured by casting sand, characterized in that the shelf 53 is arranged in the grinding chamber 531 in which the finishing slag is accommodated in the circumferential direction of several wings (532,532 ') at an inclination angle α of 60 ° Device. delete

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