KR19980064954A - Ocher sintered material and its manufacturing method - Google Patents

Abstract

The present invention relates to a loess sintered material suitable for use as a heat storage material of a dust collector, a packing material for a packed column, or a heat storage combustion device, and a manufacturing method thereof. In the manufacturing method of the ocher sintered material of the present invention, preparing the ocher powder and zeolite powder, mixing the ocher powder and zeolite powder in a mixing ratio of 3: 7 to 9: 1 based on the weight, and kneading by adding water , Molding the kneaded mixture into a predetermined shape, and calcining the molding at a temperature of 900 to 1500 ° C. As a result, the raw material cost and the manufacturing cost can be reduced by manufacturing the ocher sintered material at low firing temperature using the low cost and easy to obtain ocher as the main raw material.

Description

Ocher sintered material and its manufacturing method

The present invention relates to an ocher sintered material mainly comprising ocher and a method of manufacturing the same. In particular, the present invention relates to an ocher sintered material that can be used as a heat storage material of a dust collector, a packed column packing material, or a regenerative combustion device.

Dust and gaseous substances generated at industrial sites are removed using an electric dust collector, a scrubber, a packed tower, and the like. Since these dust collectors are often operated at high temperatures, the fillers must be designed to withstand high temperatures, and the gaseous substances containing acids or alkalis are often removed, and therefore, they must have chemical stability when operated in an acidic or alkaline atmosphere.

In addition, in order for the filler to increase the mass transfer efficiency and increase the capacity in the dust collector or the packed column, the surface area per unit volume should be large, the irregularity of the filling (if irregular filling), the voidage in the filling This needs to be geometrically large, such as moderately large, that is, low pressure difference, and adequate size of filling.

As such a filler, metal, plastic, and ceramics have conventionally been used. However, metal fillers are suitable where corrosion rates are less than 10 mm / year, and plastic fillers are suitable where they are not in contact with heat or chemicals for a long time. In addition, the ceramic filler should be used where the impact is not severe because it is strong against heat or corrosion but weak against impact.

Ceramics with high chemical and thermal stability are widely used as dust collectors or packing tower fillers as fillers operating at room temperature or high temperature. The cost is high. In addition, the ceramic filler has a disadvantage in that the price is high because the raw material is made of SiO ₂ and Al ₂ O ₃ of pure components having a high raw material cost.

Therefore, there is a need for a filler that can be manufactured at low cost while satisfying conditions such as heat resistance, mechanical durability, and chemical stability.

On the other hand, in recent years, the spread of the regenerative combustion device for the removal of volatile organic compounds (VOC) has been increasing. VOC refers to organic compounds that cause the symptoms smog (smog) increase the ozone concentration in the earth's surface causing the NO _x and photochemical oxidation by the sun rays in the air. As the combustion device for removing VOC, since the 1980s, considerable technology has been developed in the developed countries in the form of a direct combustion device, a catalytic combustion device, and a regenerative combustion device. In Korea, however, since the late 1990s, VOC removal facilities have been installed at each site due to the seriousness of VOC. However, all the combustion technologies and products (burning devices, heat storage materials) of developed countries are imported and installed. There is almost nothing.

Direct combustion device is the most widely used method in Korea. It is a device that directly contacts and burns VOC at 600 ℃ ~ 800 ℃. The device is simple and easy to manage, but the combustion temperature is high and effective waste heat recovery measures are not provided. As a result, fuel consumption increased, causing problems in terms of operating costs. As a countermeasure against this, steam, hot water, and hot air are recovered by the waste heat boiler, but the heat recovery to the outside of the system causes many problems, and there is also a problem of secondary pollution such as NO _x .

On the other hand, regenerative combustion apparatus of the would NO _x, etc. as well as an energy saving effect is large due to the development of heat recovery by direct heat exchange method using a heat storage material in economical combustion device increases to over 90% to substantially reduce the fuel consumption It can also contribute greatly to reduction.

From the 1980s to the early 1990s, starting with the cross-border proliferation of photochemical oxydants in all countries in the West, we have been recognized as a national leader in the highly energetic Savior and North America that control and recognize the seriousness of the air pollution problem from the local environment to the global environment. A proposal for reducing VOC emissions was submitted, and the US's Atmospheric Purification Act was also greatly revised, with the European and American countries working together to bring about global deterrence of VOCs, and as a response, interest in regenerative combustion systems began to rise. Currently, heat storage materials such as Sardor type (United States), Rasching ring type (Denmark), Saddle type (Germany), etc. have been developed for use in regenerative combustion apparatus in Europe and other countries. In Japan, there are not many manufacturers who are developing regenerative combustion devices by their own development, and most of them have recently been purchased in Gumi, and there is a research atmosphere to establish their own technology only in the late 1990s. Combustion technology and technology to make a combustion device has not yet been established, the situation is at the time to introduce the heat storage combustion device and heat storage material produced in the countries of the United States.

Therefore, since the regenerative combustion device and the heat storage material are being introduced by foreign companies, it is urgently required to develop domestic and thermal storage combustion devices and the heat storage material that are inexpensive and efficient in preparation for energy saving and future VOC regulations.

On the other hand, ocher occupies 15-20% of the soil of Korea, and contains a large amount of materials such as SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , CaO and MgO, and has various physical and chemical properties. have. In other words, ocher has heterogeneous, multiphase, particulate, dispersive, and porous properties with a very large interface per unit volume. These loess is a material that can be easily obtained anywhere in the country, and has no objection to living creatures. Recently, it is used for rapid growth of carp and prevention of fish disease in fish farms. It is known that it is used in large quantities and has many effects. In addition, ocher bed mattresses and floorboards using ocher thermal insulation have been developed. Recently, efforts have been made to utilize various functions of such loess in industry.

The present inventors have studied to provide fillers with excellent physical properties and low cost, based on the idea that the unique physical and chemical properties of the loess can be appropriately used for the above-described fillers and heat storage materials.

Accordingly, an object of the present invention is to provide an ocher sintered material which can be manufactured at low cost while exhibiting sufficient physical and chemical properties as a filler and a heat storage material, and a method of manufacturing the same.

1 is a flow chart showing a manufacturing process of ocher powder for the manufacture of sintered loess according to the present invention

2 is a flow chart showing a manufacturing process of the zeolite powder for the production of sintered loess according to the present invention,

Figure 3 is a flow chart showing a manufacturing process of the ocher sintered material according to the present invention,

4 is an illustration of a filler, and

5 to 12 shows the compressive strength, outer diameter, density, weight change after treatment with acid and base, surface area, temperature drop in use as heat storage material, change in compressive strength according to firing temperature, and compressive strength according to firing time of the experimental example. Graph showing each change.

The object is achieved according to the invention by an ocher sintered material consisting of a mixture containing ocher powder and zeolite powder in a weight ratio of 3: 7 to 9: 1.

Here, the ocher may contain 50 to 65% by weight of SiO ₂ , 14 to 24% by weight of Al ₂ O ₃ , 2 to 4% by weight of Fe ₂ O ₃ , 0.8 to 4.0% by weight of CaO, and 0.7 to 2.5% by weight of MgO. Preferably, more preferably, 58 to 62 weight percent SiO ₂ , 22 to 24 weight percent Al ₂ O ₃ , Fe ₂ O ₃ 2 to 4 weight percent, CaO 1.6 to 4 weight percent and MgO 0.8 to 1.2 weight percent It contains. In addition, the mixing ratio of the loess powder and the zeolite powder is preferably 4: 6 to 7: 3.

In addition, the above object, the step of preparing the ocher powder and zeolite powder, mixing the ocher powder and zeolite powder in a weight ratio of 3: 7 to 9: 1, kneading by adding water, kneaded mixture in a predetermined shape It is achieved by a process for producing an ocher sintered material comprising the step of molding and firing the molded product at a temperature of 900 to 1500 ° C.

Here, the ocher powder contains 50 to 65% by weight of SiO ₂ , 14 to 24% by weight of Al ₂ O ₃ , Fe ₂ O ₃ 2 to 4% by weight, CaO 0.8 to 4.0% by weight, MgO 0.7 to 2.5% by weight. Preferably, more preferably, 58 to 62% by weight of SiO ₂ , 22 to 24% by weight of Al ₂ O ₃ , 2 to 4% by weight of Fe ₂ O ₃ , 1.6 to 4% by weight of CaO and 0.8 to 1.2% by weight of MgO. It contains. In addition, the mixing ratio of the loess powder and the zeolite powder is preferably 4: 6 to 7: 3.

In addition, it is preferable that the ocher powder and the zeolite powder have a particle size of 250 mesh or less.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The loess sintered material of the present invention is made by firing a mixture of loess powder and zeolite powder. Hereinafter, the manufacturing process of the loess sintered material according to the present invention will be described in detail.

Manufacturing process

1) Preparation of Ocher Powder

The ocher powder manufacturing process is shown in FIG. 2. Samples are first taken, dissolved in HF, and inspected by ICP before they are taken from the loess. Component is approximately SiO ₂ (50-65%), Al ₂ O ₃ (14-24%), Fe ₂ O ₃ (2-4%), CaO (0.8-4.0%), MgO (0.7-2.5%) Loess is collected within the range of (Y1). The collected ocher is crushed to a size of several cm, preferably 1 cm, using a jar crusher (Y2). The ground loess is dried in a drying furnace maintained at 105 ° C. for 15 to 48 hours, preferably for 24 hours (Y3). The dried ocher is sieved with a sieve of 1 to 4 mm, preferably with a sieve of 2 mm to remove foreign substances such as stones and tree roots (Y4). The ocher from which stones and foreign matters are removed is pulverized into particles having a diameter of 0.1 mm to 0.3 mm or less, preferably 0.2 mm or less with a roller mill (Y5). As the particles are smaller, the sintering temperature can be lowered and fuel is saved, so that the pulverized particles are sieved using a sieve of 250 mesh or less, preferably about 325 mesh (44 μm) (Y6), so that only particles of 44 μm or less are screened out (Y7)

2) Preparation of Zeolite Powder

The zeolite powder manufacturing process is briefly shown in FIG. As shown in FIG. 3, samples were taken from the zeolite mining site and dissolved in HF to inspect the components with ICP, and zeolite ores, in particular, the main components were SiO ₂ (60 to 67%), Al ₂ O ₃ (11 to 18). %), Fe ₂ O ₃ (0 to 2%), CaO (2 to 2.5%), Na ₂ O (0.7 to 2.5%) and K ₂ O (0.7 to 4%), preferably the component is SiO ₂ (62 to 63%), Al ₂ O ₃ (17.5 to 18%), Fe ₂ O ₃ (0 to 0.5%), CaO (2.5%), Na ₂ O (0.9%), and K ₂ O (0.7%) Phosphorus ore is mined (Z1). The raw ore is crushed to a size of several cm with a jar crusher, preferably 1 cm or less (Z2).

The soil and corrosives on the surface of the ore are washed with water (Z3). The washed raw mass is dried in a furnace maintained at 105 ° C. for 15 to 48 hours, preferably 24 hours (Z 4). The dried raw ore is pulverized to 1 to 5 mm, preferably 2 mm in an impact breaker (Z5). Zeolite pulverized to 2mm through a grinding mill (Z6) of a roller mill and an air separator (Z6) to adjust the recovery rate of the cyclone (bag) and bag filter (250 filter), preferably about 250 mesh The distribution of particle size passing through 325 mesh (44 μm) is adjusted to 90% to 99%, preferably 95% (Z7) to give a natural zeolite powder (Z8).

3) Preparation of Ocher Sintered Material

The filler manufacturing process is briefly shown in FIG. As shown in FIG. 4, the ocher and zeolite particles ground and screened into fine particles are in a ratio (weight ratio) of 3: 7 to 9: 1, preferably in a ratio of 4: 6 to 7: 3, more preferably. Mixes in a ratio of 6: 4 (S1). 20 to 30% by weight, preferably 25% by weight of water is added to the mixed raw materials (S2) and kneaded well so that the raw materials mixed with ocher, zeolite and water are mixed well (S3). Put the kneaded raw material into the molding apparatus and apply a constant pressure by using a hydraulic cylinder, as shown in Figure 4, Rasching ring (Spiral ring), Partition ring (Partition ring), Wresting It is molded into a ring (Lessing ring) or the like (S4). The molded product was dried at 60 ° C. for 24 hours (S5), and then calcined at 900 ° C. to 1500 ° C., preferably at 1100 ° C., for about 1 to 5 hours, preferably 3 hours (S 6). Obtain payment (S7).

Experiment

In the present invention, the loess components of the loess sintered material of the present invention, the mixing ratio of loess and zeolite, and the firing temperature and the baking time suitable for producing the loess sintered material are suitable for use in the dust collector filler and the heat storage material of the regenerative combustion apparatus. In order to establish the following experiment was performed. However, the following experimental examples are only examples for establishing specific conditions of the present invention, and do not limit the scope of the present invention.

1. Selection of ocher

Ocher has not only different components but also different plasticity and different fire resistance and sintering properties depending on the place of origin. For use as a filler and a heat storage material, samples are extracted from each place to examine plasticity and compressive strength after firing. The ocher should be selected to be suitable as a filler and a heat storage material.

Therefore, in order to select a suitable loess as a filler or a heat storage material, the loess was collected from five loess collection sites nationwide, and the component analysis was carried out. The filler was manufactured according to the manufacturing method of the loess sintered material of the present invention using the loess as a raw material. (Here, the filler was prepared under the same conditions as the manufacturing method of the present invention, except that 100% loess was used, in particular, at a firing temperature of 1100 ° C. and a firing time of 3 hours.) The plasticity and the compressive strength of the prepared filler were Measured.

Component analysis of the collected ocher was carried out by ICP, the components of the ocher are shown in Table 1.

Chemical composition of loess collected from each mountain mountainous district SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ CaO MgO Ignition loss One 75.30 14.00 0.96 3.44 1.73 3.22 2 55.88 24.0 1.98 0.65 1.34 14.40 3 58.66 24.06 2.20 3.96 1.21 10.77 4 62.02 22.15 3.79 1.62 0.83 9.38 5 48.52 31.62 1.74 0.88 1.45 13.45

At this time, plasticity was judged by the shape at the time of molding, and it was evaluated that the shape of the molded filler was smooth, bad not to be cracked or smooth at the time of molding, and the middle was normal. Table 2 shows the plasticity and compressive strength of the fillers made of loess for each production area.

Loess Plasticity and Compressive Strength of Each Region Sample Number One 2 3 4 5 Plasticity Bad usually good good Bad Compressive strength (kgf / cm ² ) 560 572 582 576 520

As shown in Table 2, it can be seen that the ocher component having high plasticity and high compressive strength during molding are samples 3 and 4. That is, when the filler is manufactured using loess composed of the following components, a filler having high plasticity and high compressive strength can be obtained. Therefore, in the present invention, it is preferable to use ocher composed of the following components. However, since the optimum component range may vary depending on other conditions, for example, the mixing ratio of the loess and zeolite, the firing temperature, the firing time, etc. As long as it can achieve, it should be considered to be included in the scope of the present invention.

50 to 65% SiO ₂ , 14 to 24% Al ₂ O ₃ , Fe ₂ O ₃ 2 to 4%, CaO 0.8 to 4.0%, MgO 0.7 to 2.5% by weight loess.

2. Mixing ratio of particles

Select ocher as the main raw material, increase the acid resistance, alkali resistance, plasticity and compressive strength and add zeolite and talc to prevent volume loss, and mix them with the raw material ratio as shown in Table 3 below to prepare the ocher sintered material according to the production method of the present invention. In order to check whether the loess sintered material has the characteristics of a filler or a heat storage material, the following experiment was carried out. As a result of comprehensively considering various properties by the following experiment, it was confirmed that the ocher sintered material mixed with ocher and zeolite in a predetermined ratio was suitable for use as a filler and a heat storage material.

Mixing ratio (weight ratio) of particles for filler molding Sample number One 2 3 4 5 6 7 8 9 10 11 12 Comparative example Example Comparative example ocher 100 80 60 40 20 80 60 40 20 33 60 60 Zeolite 0 0 0 0 0 20 40 60 80 33 30 10 talc 0 20 40 60 80 0 0 0 0 33 10 30

3. Physical property experiment

(1) compressive strength test

After mixing each powder in accordance with the mixing ratio of Table 3, and kneaded by adding water (25%) to it, the kneaded mixture was molded into a ratchet ring having an outer diameter of 15 mm, an inner diameter of 8.5 mm, and a length of 15 mm by a molding apparatus ( After molding into a rasching ring), the ocher sintered materials were prepared by drying at 40 ° C. for 24 hours and calcining at 1100 ° C. for 3 hours. The results of measuring the compressive strength of the loess sintered materials are shown in FIG. 5.

The compressive strength (sample 1) at 100% ocher was 582 kgf / cm ^2, and the compressive strength decreased with the addition of talc. When 80% was added, the compressive strength decreased to 232 kgf / cm ² . However, when the zeolite was added, the compressive strength tended to increase, and when 60% was added, the compressive strength was the highest as 1660 kgf / cm ² . And when all three types of ocher, zeolite and talc were added, the compressive strength of samples 11, ocher 60, zeolite 30, and talc 10% was the highest as 1081 kgf / cm ² .

(2) the outer diameter of the filler

The outer diameter of each of the fillers produced by firing under the same conditions as in (1) was measured and shown in FIG. 6. The outer diameter of the filler made from pure ocher was 14.13 mm, and the outer diameter of the filler increased according to the amount of talc added. In case of mixing 20% of clay and 80% of zeolite, the outer diameter was the smallest at 13.33mm.

This is caused by the particles approaching each other and reducing their volume and shrinkage as the water that was the glidant between ocher and zeolite particles was evaporated and removed during the drying process, and the zeolite with relatively low vitrification temperature was calcined at 1100 ° C. This is because the volume is reduced by reducing the space between the particles and vitrified, and in the case of talc, since the vitrification temperature is high, the vitrification does not occur at 1100 ° C., so that the shrinkage of the outer diameter does not occur. It was found to be the cause of low intensity.

(3) density of filler

The density of each filler prepared by firing under the condition of (1) was measured and shown in FIG. 7. The density of pure loess was 2.44 g / cm ^3, and the more the talc was added, the more the density tended to increase. The density of the loess 20% and the talc 80% of the filler was 2.63g / cm ³ , the density of the loess 20, zeolite 80% of the filler was 2.32g / cm ³ .

(4) acid and alkali resistance

In order to prepare a filler under the condition of (1) and to test the acid resistance and alkali resistance of the filler, 10 test pieces were put in 6N sulfuric acid solution and 6N NaOH solution in extreme acidic and alkaline conditions, respectively, and maintained at 100 ° C. After shaking for 24 hours in a thermostat, degreasing and weight reduction were measured, and the results are shown in FIG. 8.

When each filler was added to 6N sulfuric acid solution, the weight loss after 24 hours was 0.05 ~ 1.18%. In general, when zeolite was added a lot, the acid resistance was strong, and when talc was added, acid resistance was decreased. Zeolite-filled fillers (60-80%) showed the smallest change in weight (0.05%), thereby indicating the highest acid resistance.

On the other hand, when the filler was added to 6N NaOH solution, the weight change after 2 hours showed a significant difference from 0.5% to 15.2%. Sample 7, which has 60% ocher and 40% zeolite, has the smallest weight loss, reducing the weight of 0.52%, thereby indicating the highest alkali resistance. On the other hand, samples 10, 11 and 12, in which three kinds of inorganic particles were mixed, showed high alkalinity due to high weight change. In the acid and alkali resistance experiments, the weight change in the acid solution was 0.1% and the weight change in the alkaline solution was 0.5% when the yellow soil and the zeolite were mixed at a ratio of 60:40, which satisfies both the acid and alkali resistance well. It has been shown to have sufficient chemical stability when used in the actual process.

On the other hand, after performing acid treatment and alkali treatment to measure the acid resistance and alkali resistance, respectively, the compressive strength of the filler was measured, the results are shown in FIG. After all samples were treated with acidic and alkaline solutions, the compressive strength was reduced. The compressive strength after acid and alkali solution treatment of sample 7, which was mixed with 60% and 40% of ocher and zeolite, respectively, was the highest at 1415kgf / cm ² and 1312kgf / cm ² , respectively.

(5) surface area measurement

The filler was prepared under the condition of (1), and the surface area per 1 g of the filler was measured by BET adsorption isotherm using nitrogen as a carrier, and the results are shown in FIG. 9. The surface area of pure loess was 1.74m ² / g per g, and the surface area increased with the addition of talc and increased to 3.47m ² / g at 20% ocher and 80% talc. However, as the zeolite was added, the surface area decreased, and the surface area decreased to 0.31 m ² / g when 20% ocher and 80% zeolite were added. Talc-filled fillers are not suitable for use as fillers because they have a larger surface area than other fillers, but as shown in (1) above, their compressive strength is weak, and as shown in (4) above, they have low acid resistance and alkali resistance. It turned out. The zeolite-filled filler had the smallest surface area in this experiment, but fired at high temperature to 6.0 x 10 ^-4 in the surface area of the conventional Rasching ring type of the same size as the loess sintered material of the present invention without micropores. In comparison, the surface area was greatly different, and the loess sintered material of the present invention had a large amount of micropores, so that the heat storage performance was high due to the pores included in the heat storage material.

(6) heat storage performance

The heat storage material was manufactured under the condition of (1), and 30g of heat storage material was put into an insulated furnace using a sample except 2, 3, 4, and 5 samples having low compressive strength in (1) as the heat storage material. After the temperature was raised to 780 ° C., the temperature reduction time was observed to test the heat storage performance, and the results are shown in FIG. 10. As a result of considering the temperature change by setting the sample number of furnace with no heat storage material as 0, the temperature decrease per minute of sample 0 was 4.83 ℃ / min, and the furnace temperature was 212 ℃ after 2 hours, but the samples 1, 6, 7, When fillers 8, 9, 10, 11, and 12 were charged, the temperature after 2 hours between the fillers ranged from 334 ° C to 353 ° C. The sample with the lowest temperature after 2 hours was 334 ° C. The highest temperature was 1, and after 2 hours, the temperature was 353 ° C, and the temperature of samples 7, 8, and 9 was 350 ° C. The temperature reduction of sample 1, 100% ocher, was 3.56 ° C./min per 30 g of heat storage material. Except for sample 6, the heat storage performance of other samples was found to be similar.

As a result of the above experiments, it was concluded that the loess sintered material suitable for the current collector filler and the heat storage material of the regenerative combustion device had a mixture ratio of loess and zeolite of about 3: 7 to 9: 1.

4. Firing conditions

(1) firing temperature

If the firing temperature is low, the mechanical strength and durability cannot be maintained because it does not enter the sintering process. Therefore, the firing temperature must be heated to the temperature where vitrification occurs. At a sufficiently high temperature, the sintering process takes place and vitrification occurs, increasing physical strength. However, if the firing temperature is too high, the strength and abrasion, etc. are increased, but the effect is not high compared to the cost of energy, so there is no need to fire the filler at a higher temperature than necessary. It is reasonable to fire at a temperature that can maintain a strength that meets the desired purpose from the point of view of energy consumption, which is the most expensive for producing high temperature fillers or carriers.

In order to determine the optimum firing temperature of the filler, sample 7, which has high mechanical strength, high acid resistance and alkali resistance, yellow soil 60% and zeolite 40%, was fired for 3 hours while the firing temperature was changed from 900 to 1400 ° C. for compressive strength. Was measured, and the results are shown in FIG.

The compressive strength increased with the sintering temperature, and the compressive strength increased rapidly up to 1100 ℃ but slowed down at the temperature above 1100 ℃.

As shown in FIG. 11, vitrification did not occur at a temperature below 1100 ° C. because of the rapid increase in compressive strength with increasing temperature, and vitrification occurred above 1100 ° C. due to the slow increase in compressive strength due to temperature increase. And can be seen. Therefore, it can be seen that the optimum firing temperature of the filler according to the present experimental example is 1100 ° C.

(2) firing time

The firing time as well as the firing temperature in the manufacture of fillers are important factors in mechanical strength and energy consumption. Even when firing at the same temperature, since the mechanical strength varies depending on the firing time, it is necessary to determine the optimum firing time based on the optimum temperature. In order to determine the optimum firing time of the filler, sample 7, which has high mechanical strength, high acid resistance and alkali resistance, yellow soil 60% and zeolite 40%, was fixed at a firing temperature of 1100 ° C and a firing time of 1 hour to 6 hours. The compressive strength was measured by baking while changing, and the results are shown in FIG. 12.

As shown in FIG. 12, the compressive strength tends to increase as the firing time increases. If the firing time is 1 hour and 2 hours, the compressive strength is not low, but it shows a rapid increase in compressive strength according to the firing time. It can be seen that the firing should be about 3 hours, it was found that the optimum firing time when the firing time is 3 hours at 1100 ℃.

As described above, the present invention relates to a loess sintered material that can be used as a filler and a heat storage material for room temperature and high temperature, and a method of manufacturing the same. However, since it is fired at a temperature of 1400 ° C. or less, especially about 1100 ° C., compared to a pure SiO ₂ and Al ₂ O ₃ mixture filler which should be fired at a temperature of 1400 ° C. or higher, the energy cost is low. The raw material cost and the manufacturing cost can be lowered, and the ocher sintered material of the present invention has a low maintenance cost because of high mechanical durability and chemical stability.

And when the ocher sintered material of the present invention is used as a heat storage material, in addition to the above effects, because the production of heat storage material having excellent heat storage performance using domestic technology and raw materials, not only the material cost is reduced but also the low manufacturing cost and excellent performance This can lead to import substitution effects and export opportunities.

Claims (6)

An ocher sintered material comprising a mixture containing ocher powder and zeolite powder in a weight ratio of 3: 7 to 9: 1. The method of claim 1, The ocher is characterized in that it contains 50 to 65% by weight of SiO ₂ , 14 to 24% by weight of Al ₂ O ₃ , 2 to 4% by weight of Fe ₂ O ₃ , 0.8 to 4.0% by weight of CaO, 0.7 to 2.5% by weight of MgO Ocher sintered material. The method of claim 2, The loess sintered material, characterized in that the mixing ratio of the loess powder and the zeolite powder is 4: 6 to 7: 3. In the manufacturing method of the ocher sintered material, Preparing ocher powder and zeolite powder, Mixing the ocher powder and the zeolite powder in a weight ratio of 3: 7 to 9: 1, and kneading by adding water, Molding the kneaded mixture into a predetermined shape, and The method of manufacturing a loess sintered material comprising the step of firing the molding at a temperature of 900 to 1500 ℃. The method of claim 4, wherein The ocher powder is characterized by containing 50 to 65% by weight of SiO ₂ , 14 to 24% by weight of Al ₂ O ₃ , 2 to 4% by weight of Fe ₂ O ₃ , 0.8 to 4.0% by weight of CaO, 0.7 to 2.5% by weight of MgO. Method for producing a filler or heat storage material. The method of claim 5, The ocher powder and the zeolite powder is a manufacturing method of the ocher sintered material, characterized in that having a particle size of less than 250 mesh.