KR101696716B1 - Manufacturing method of high-strength artificial stone block using tailing - Google Patents

Abstract

The present invention relates to a production method of a high-strength artificial stone block using tailing. The production method of the stone block comprises the steps of: mixing a plurality of tailings to form a tailing mixture; adding water to the tailing mixture; forming a tailing molded product by pressurizing, molding and drying the tailing molded product; and sintering the tailing molded product. The tailing mixture comprises: 14 to 20 parts by weight of a silica mine tailing; and 28 to 80 parts by weight of the tailings selected from limestone mine tailings and molybdenum mine tailings, with respect to 100 parts by weight of gold mine tailings. The present invention can be variously used in construction and interior fields and has excellent product competitiveness by producing a high-quality and high-strength artificial stone block at a low cost using the tailings, and also contributes to relevant industries and local economies and improves environmental issues by recycling the tailings which are conventionally simply disposed and abandoned.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a high strength artificial stone block using a tailwash,

The present invention relates to a method of manufacturing an artificial stone block, and more particularly, to a method of manufacturing a high-strength artificial stone block using a tailstock.

Generally, up-cycling means re-creating the product with increased value by adding design or utilization to the target product, and interest in up-cycling is increasing in real life and various industries.

Conventional mine waste, which is a waste material, is a good ceramic material with controlled particle size if it does not contain harmful substances. Therefore, interest in environmental problems is increasing and interest in recycling of mine tailings is high. Nevertheless, there is no disposal method or recycling method for such tailings, and it is still left in the open air. Meanwhile, in the process of collecting and processing natural stone for high-grade building materials, nature is damaged and various environmental problems are caused. These natural stones are expensive and depend on imports.

In consideration of these circumstances, one of the ways to recycle the tailings as a building material has been recently discussed. If the characteristics of the tailings can be grasped and recycled or reused as building materials, it is possible to solve the environmental problems mentioned above, as well as to expect a high import substitution effect on expensive products such as natural stone, There is an urgent need for practical and practical upcycles for mine tailings.

The present invention provides a method for manufacturing a high-strength artificial stone block by using the tailings which have been conventionally disposed of or discarded.

The present inventors focused attention on the components and the contents of the main tailings in the process of recycling the main tailings which are available at low cost but which do not have a desirable recycling scheme and strictly control the mixing ratio thereof so that the high- Block, and led to the present invention. The gist of the present invention based on the recognition of the above problem is as follows.

(1) mixing various kinds of tailings to form a tailings mixture; Adding water to the extrusion mixture; Forming the extrudate mixture by pressurizing and drying the extrudate mixture; The method according to any one of claims 1 to 3, wherein the mineral admixture is a mixture of 14 to 20 parts by weight of a silica mine tailings with respect to 100 parts by weight of gold mining tailings, 28 to 80 parts by weight of a tailings selected from limestone mining and molybdenum mine tailings, Wherein the stone block has a thickness of at least 50 mm.

(2) the gold mine tailings is 70 ~ 79wt% of silica (SiO ₂₎ and 10 ~ 15wt% of alumina (Al ₂ O ₃₎ and wherein the silica mine tailings is 80 ~ 90wt% of silica (SiO ₂₎ and 5 to the 6wt% of alumina (Al ₂ O ₃₎ to contain, and the limestone mine tailings is 30 ~ 40wt% calcium oxide (CaO) and 30 ~ 35wt% of silica (SiO ₂₎ and 5 ~ 13wt% of alumina (Al ₂ O ₃₎ oxide and wherein molybdenum mine tailings is 30 ~ 40wt% of silica-iron oxide (SiO2) and 20 ~ 30wt% calcium oxide (CaO) and 10 ~ 15wt% of (Fe ₂ O ₃₎ and alumina (Al of 5 ~ 10wt% ₂ O ₃ ) as the main component.

(3) The method of producing a stone block according to the above (1), wherein the water contains an organic binder.

(4) The method of manufacturing a stone block according to (1), wherein the sintering process is performed at a temperature of 1100 to 1300 ° C.

INDUSTRIAL APPLICABILITY According to the present invention, a high-quality artificial stone block of high quality is manufactured at low cost by using the tailings, so that the product is highly competitive and can be utilized variously in construction and interior fields. In addition, it is possible to improve the environmental problems and contribute to the related industry and the local economy by appropriately mixing and recycling the tailings which have been conventionally disposed or discarded.

1 is a photograph of a high-strength artificial stone block manufactured according to the first preferred embodiment of the present invention.
2 is a photograph of a high-strength artificial stone block manufactured according to the second preferred embodiment of the present invention.
3 is an electron micrograph of the surface of a high-strength artificial stone block produced according to the first preferred embodiment of the present invention.
4 is an electron micrograph of an internal fracture surface of a high-strength artificial stone block manufactured according to the first preferred embodiment of the present invention.
5 is an electron micrograph of the surface of a high strength artificial stone block manufactured according to the second preferred embodiment of the present invention.
6 is an electron micrograph of an internal fracture section of a high strength artificial stone block manufactured according to the second preferred embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific descriptions of known techniques are omitted within the scope of the present invention unless the gist of the present invention is obscured. In addition, throughout the specification, when an element is referred to as including an element, it is understood that the element may include other elements, not the exclusion of any other element, unless specifically stated otherwise.

The method for manufacturing a high-strength artificial stone block according to the present invention is characterized in that a mixture of a tailings formed by mixing various kinds of tailings is formed into a block shape, dried and then sintered.

In the embodiment of the present invention, the abandoned light mixture is composed of a combination of four kinds of tailings such as gold mine tailings, quartz mine tailings, limestone mine tailings, and molybdenum mine tailings. Based on the gold mine tailings and the quartz mine tailings, And one of mine tailings and molybdenum mine tailings is selectively added.

The above-mentioned gold mining wastes include minerals containing 70 to 79 wt% of silica (SiO ₂ ) and 10 to 15 wt% of alumina (Al ₂ O ₃ ) as main components and 5 wt% or less of the remainder Potassium (K2O) and iron oxide (Fe2O3) of 1 wt% or less as other components. The gold mine tailings have a relatively high silica content and are very stable in molding and firing, and serve as the foundation of the sintered stone block.

In addition, the above-mentioned quartz mine tailings is a tail salt which is discharged from a conventional silica mine and contains 80 to 90 wt% of silica (SiO ₂ ) and 5 to 6 wt% of alumina (Al ₂ O ₃ ) as main components and 3 wt% Other components include iron oxide (Fe ₂ O ₃ ) and potassium oxide (K ₂ O) of 1 wt% or less. In the case of silica mine tailings, the silica content is relatively high, and the sintering process is promoted by sufficiently supplying the liquid amount necessary for forming the stone block at the time of firing.

The limestone mine tailings are minerals released from ordinary limestone mines and contain 30 to 40 wt% of calcium oxide (CaO), 30 to 35 wt% of silica (SiO ₂ ) and 5 to 13 wt% of alumina (Al ₂ O ₃ ) (Fe ₂ O ₃ ), 4 wt% or less of potassium oxide (K ₂ O), and 3 wt% or less of magnesium oxide (MgO) in an amount of 5 wt% or less.

Also, the molybdenum mine tailings are minerals emitted from ordinary molybdenum mines and include 30 to 40 wt% silica (SiO ₂ ), 20 to 30 wt% calcium oxide (CaO), 10 to 15 wt% iron oxide (Fe ₂ O ₃ ) (Al ₂ O ₃ ) as main components and magnesium oxide (MgO) of 3 wt% or less and potassium oxide (K ₂ O) of ₂ wt% or less as the other components.

The limestone minerals and molybdenum minerals are selectively added to the mixture of limestone minerals and limestone minerals as described above when forming the abandoned mine tailings mixture. However, in both limestone and molybdenum mine tailings, the calcium oxide (CaO) content, which is unfavorable to sinterability and strength, is higher than that of ordinary clay. However, when the weight is controlled to about 10% It can be recycled for the production of a stone block having a desired sintering property and strength without any problem. Iron oxide (Fe2O3), potassium oxide (K2O) and the like as a minor component contained in the clay minerals also contribute to sinterability and strength improvement by lowering the temperature at which silica is dissolved to form vitreous. On the other hand, in case of molybdenum mine tailings, the content of calcium oxide is relatively lower than that of limestone mine tailings, and when the tailings mixture is composed of molybdenum mine tailings, the iron oxide content is high, which is advantageous for the production of a beautiful red stone block.

Based on the composition of each of the above-mentioned tailings, the mixing ratio of the tailume mixture prepared as the raw material of the high-strength artificial stone block according to the present invention is such that 14 to 20 parts by weight of the silica- It is preferable that the tailings selected from the limestone mining and the molybdenum mining are added in an amount of 28 to 80 parts by weight. More preferably, 33 parts by weight of the quartz mine tailings are mixed with 100 parts by weight of the gold mine tailings and 50 parts by weight of either the limestone mine tailings or the molybdenum mine tailings is added.

Each of the above-mentioned four kinds of tailings is dried and crushed and prepared as a raw material for the high-strength artificial stone block according to the present invention. If necessary, the impurities are removed and the particle size is controlled through sieving.

Each of the tailings prepared in a predetermined mixing ratio is uniformly mixed and formed into a tailing mixture in the same manner as, for example, dry bowling. In order to maintain the shape after molding, water containing the water or the organic binder is added in an amount of about 10% by weight based on the weight of the clay mixture, uniaxially compacted using a pressure molding machine, and sufficiently dried do. In this case, the organic binder serves as a cellulose-based binder to impart a minimum strength to the molded body during uniaxial molding, and is burned and removed in the sintering process.

After the molding and drying process is completed, the firing process is finally performed to complete the artificial stone block. The firing temperature is preferably maintained at 1100 to 1300 占 폚, more preferably at 1200 to 1250 占 폚. If the sintering temperature is lower than 1100 ° C, sufficient glass quality required for shrinkage against the stone block is not sufficiently formed and satisfactory sintering strength can not be obtained. If the sintering temperature is higher than 1300 ° C, the glass quality is excessively formed, .

In this case, the temperature raising rate is raised from 1 to 5 캜 to the firing temperature, and the holding time at the firing temperature is preferably 1 hour or less. If the heating rate exceeds 5 캜 in a given process time, sufficient diffusion of the vitreous is not desirable.

Through this firing process, amorphous silica (SiO ₂ ) contained in various kinds of clay minerals is vitrified and solidified together with other components, so that they have the same texture and strength as natural stone. Particularly, in the case of the present invention, a small result as a general ceramic raw material is obtained by controlling the components and the content of the tailing mixture to form a sufficient liquid glassy substance to induce a similar sintering process to the transient liquid phase sintering, When the components of the liquid are mixed through the diffusion, the liquid phase appears and thereby the sintering is promoted. However, this is different from that in a general transition liquid sintering in which a liquid phase is limitedly formed at some grain boundaries. In addition, in the case of ordinary household articles made of ceramics such as tiles or porcelain, the surface pores are coated with a glaze formed from a glaze when the second firing is performed by applying a glaze or the like to the surface after the first firing, In the case of the present invention, it is possible to form a stone block having a smooth surface by only primary firing.

Specifically, referring to Figs. 1 and 2 and Figs. 3 and 5, the surface of the artificial stone block forms a sense of esthetics of a natural stone having a smooth gloss even in the unmachined state, It can be used as an interior and exterior interior and exterior material for interior decoration. Also, referring to FIG. 4 and FIG. 6, since some pores remain in the interior but have a very dense structure as a whole, excellent strength can be realized.

The method of manufacturing the high strength artificial stone block through the upwelling ring of the tailings according to the present invention has been described above. Hereinafter, preferred embodiments of the present invention will be described in more detail. The present invention may be understood more clearly by the following examples, but it is not intended to limit the scope of the present invention and those skilled in the art will understand that various changes and modifications may be made without departing from the spirit of the present invention. And all such modifications and variations are to be understood as falling within the scope of the invention as disclosed in the claims or equivalents thereof.

Example  One

Dried, and crushed, respectively, were uniformly mixed at a weight ratio of 6: 1: 3 by ball milling, and 5 wt% water was added at a weight ratio of mixed tailings to prepare a 20 MPa Lt; / RTI > and then dried to produce a molded article. At this time, the size of the molded body is 100 × 100 × 20 mm. The formed body was heated to 1 ^o C / min and held at 1250 ^o C for 30 minutes. The compact was air - cooled to produce a high - strength artificial stone block.

The above-mentioned gold mine tailings utilize the tailings discharged from Haenam, Jeollanam-do, the above-mentioned quartz mine tailings, and the tailings discharged from Gyeonggi-do, Gyeonggi-do, respectively.

Example 2

Dried, and crushed, respectively, were uniformly mixed at a weight ratio of 6: 1: 3 by ball milling, and mixed with 5 wt% a water Was uniaxially pressed at a pressure of 20 MPa and then dried to prepare a molded article. At this time, the size of the molded body is 100 × 100 × 20 mm. The formed body was heated to 1 ^o C / min and calcined at 1250 ^o C for no holding time and air - cooled to produce a high - strength artificial stone block.

The gold mine tailings utilize the tailings discharged from Haenam, Jeollanam-do, the mine tailings mine tailings discharged from Gyeonggi-do, and the molybdenum mine tailings tailings discharged from Jecheon, Chungcheongbuk-do.

evaluation

(Surface color)

In the case of Example 1, that way, a relatively large content of silica (SiO ₂₎ and calcium oxide (CaO) ttimyeo a light color, that red dots by iron oxide (Fe ₂ O ₃₎ distribution shown in Figure 1 Respectively. In the case of Example 2, as shown in Fig. 2, it was confirmed that the content of iron oxide (Fe ₂ O ₃ ) was relatively large and the overall khaki color was attained.

(Shape and shrinkage ratio)

In the case of Example 1, the size of the sintered body after sintering was 92 × 92 × 18 mm, which had a shrinkage ratio of about 8%, and the block shape of the original formed body remained unchanged. In the case of Example 2, the shrinkage ratio was almost equal to that of Example 1 at 92 × 92 × 19 mm, and the block shape remained unchanged.

(Absorption rate)

According to the test method specified in Korean Industrial Standard KSL4201 stipulated for the bricks made by kneading, molding, drying, and firing with two kinds of high strength artificial stone blocks of Examples 1 and 2 as raw materials, .

The water absorption rate can be calculated as A = W2-W1 / W1 * 100 (%) where A is the water absorption rate, W1 is the weight after drying (g), W2 is the weight (g) of the catcher sample immersed in water for 24 hours Respectively. After drying, the weight W1 (g) was measured by drying the sample in an air bath at 105-120 ^° C for 24 hours, cooling it to room temperature and weighing it. The weight W2 (g) of the catcher specimen was measured by taking the sample out of the water at a distance of 50-60 mm from the water of 15-25 ^o C to the water surface for 24 hours, wiping the surface with a damp cloth and immediately weighing it.

As a result of measuring the water absorption rate in this manner, it was confirmed that the water absorption rate of the high-strength artificial stone block of Example 1 was 0.622% and the water absorption rate of the high-strength artificial stone block of Example 2 was 0.468%.

(burglar)

According to the test method specified in the Korean Industrial Standard KSL4201 stipulated for bricks made by kneading, molding, drying, and firing two types of high strength artificial stone blocks of Example 1 and Example 2 using clay as a raw material, .

The compressive strength can be obtained by C = W / A (N / mm 2), where C is the compressive strength (N / mm 2), A is the pressed area (mm 2) and W is the maximum load (N). The pressurized area A (mm2) was measured after drying in an air bath at 100 ^° C for 24 hours, taking the side of the frozen block as a pressing surface. Also, the maximum load W (N) was measured when a specimen was broken in a state in which a uniform load was applied to a pressing surface through a thick paper as necessary.

As a result of measuring the strength in this manner, it was found that the compressive strengths of the artificial stone blocks of Examples 1 and 2 were at least 100 (N / mm ² ) and natural marbles were at least 50 (N / mm ² ) It was confirmed that the artificial stone block exhibits relatively excellent strength characteristics.

As described above, it has been confirmed that the artificial stone block of high quality and high strength can be produced at low cost by using the tailings which have been conventionally simply discarded or discarded as a resource, and it is possible to effectively produce artificial stone blocks of high quality, It can be utilized. As a result, it is expected that it will contribute to the development of related industries and local industries as well as the improvement of environmental problems caused by difficulties in processing the tailings.

Claims (4)

Mixing various kinds of tailings to form a pure tailings mixture; Adding water to the extrusion mixture; Forming the extrudate mixture by pressurizing and drying the extrudate mixture; And firing the microstructure forming body,
Wherein the mineral mixture comprises 14 to 20 parts by weight of a silica mine tailings mineral and 28 to 80 parts by weight of a tail mineral selected from the group consisting of limestone and molybdenum minerals,
The gold mine tailings is 70 ~ 79wt% of silica (SiO ₂₎ and 10 ~ 15wt% of alumina (Al ₂ O ₃₎ a and wherein the silica mine tailings is 80 ~ 90wt% of silica (SiO ₂₎ and 5 ~ 6wt% alumina (Al ₂ O ₃ ), the limestone mine tailings including 30 to 40 wt% calcium oxide (CaO), 30 to 35 wt% silica (SiO ₂ ) and 5 to 13 wt% alumina (Al ₂ O ₃ ) the molybdenum mine tailings is of 30 ~ 40wt% of silica (SiO2) and 20 ~ 30wt% calcium oxide (CaO) and 10 ~ 15wt% of iron oxide (Fe ₂ O ₃₎ and alumina of _{5 ~ 10wt% (Al 2 O} 3 ). ≪ / RTI >
delete The method of claim 1, wherein the water contains an organic binder.
The method for producing a stone block according to claim 1, wherein the calcination process is performed at a temperature raising rate of 1 to 5 占 폚 at a temperature of 1100 to 1300 占 폚 for 1 hour or less, followed by air cooling.

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