KR20150070726A - The manufacturing method of high purity alumina ceramic balls using waste aluminum dross - Google Patents

Abstract

The present invention relates to a method for manufacturing a high-purity alumina ceramic ball with waste aluminum dross. More specifically, the method includes: a first step of recovering aluminum hydroxide from the waste aluminum dross; a second step of grinding and sintering the recovered aluminum hydroxide to prepare aluminum powder; a third step of mixing the aluminum powder, an inorganic binder, an organic binder, and a solvent to prepare ceramic granules and producing a ceramic ball through a refining process; a fourth step of drying the produced ceramic ball; a fifth step of calcining the dried ceramic ball at 800 to 1000°C; and a sixth step of firing the heat-treated ceramic ball at 1500 to 1700°C. The present invention can effectively recover the aluminum metal from the waste aluminum dross to prepare the high-purity alumina and manufacture the high-purity alumina ceramic ball by using the same. The present invention can minimize the amount of the dross by recycling the waste aluminum dross and reduce the industrial waste treatment cost and protect the environment accordingly. The present invention can also reduce the ceramic ball manufacturing costs and manufacture the high-purity alumina ceramic ball which is eco-friendly and economical.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-purity alumina ceramic ball,

The present invention relates to a method for producing a high purity alumina ceramic ball using aluminum waste dough, and more particularly, to a method for recovering aluminum hydroxide from an aluminum dross to be discarded and using it as a ceramic support having a high added value, To a method of manufacturing a ceramic ball.

As industrial development progresses rapidly around the world, the problem of environmental pollution caused by industrialization in various fields is getting serious. Despite the fact that efforts to solve the environmental pollution problem that is becoming serious day by day are being actively carried out in various fields, the problem of environmental pollution is not progressed much. In the fast-growing global industry, the aluminum industry is currently more than 40 million tonnes a year and by the year 2020 is estimated to reach 65 million to 70 million tonnes per year. When aluminum is dissolved, aluminum dross is formed on the surface of the molten aluminum melt, which is an essential by-product in the aluminum production process, and about 5 to 30% is produced in the whole process. The resulting aluminum dross contains about 20 to 30 wt% of aluminum metal, which leads to the loss of aluminum metal. At the present time, it is treated through landfill with waste resources. 3) Production and demand of aluminum Is expected to increase every year, the treatment of aluminum dross has not only a burden of landfill but also environmental pollution. Due to the lack of enforcement of environmental regulations and landfills, recycling of aluminum waste dross has become a global problem, and it is urgent to develop environment preservation technology through recycling of aluminum waste dross.

On the other hand, the Asia-Pacific region is the fastest growing market for bauxite and alumina among the world's fastest growing markets. High purity a-alumina with an alumina purity of more than 99% is manufactured by conventional beer method, Pyrolysis of aluminum alum, hydrolysis of aluminum alkoxide, and the like.

Alumina Ceramic Ball (Alumina Ceramic Ball) has been applied to various fields such as environmental protection and utilization to support the performance of catalyst in petroleum and chemical process. These alumina ceramic balls have stable chemical properties to withstand high temperature, high pressure, acid and alkali corrosion, and are installed in the reaction column in the chemical process producing petrochemical and specific chemical products to support the catalyst The bed mainly serves as a bed support. When installed in such a reaction column, it smoothly distributes the falling gas and liquid in the reactor tower and prevents the bed from rising due to the rising air stream. The alumina ceramic balls are also used for the removal of hydrogen and sulfur, catalyst reforming, selective hydrogen removal, catalytic processes such as catalyst isomers, natural gas and inert gas, and drying of hydrocarbons in liquid and gas. It is required to maintain sufficient porosity, high strength and high heat resistance for fluid flow.

Therefore, when high purity alumina is recovered by effectively recovering aluminum metal from the discarded aluminum dross and the high purity alumina ceramic ball is manufactured using the same, it is possible to reduce the industrial waste treatment cost and environmental protection effect And the manufacturing cost of the alumina ceramic balls having a high added value can be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and provides a method for producing a high purity alumina ceramic by recovering aluminum metal from aluminum wasted loss to produce high purity alumina. .

According to an aspect of the present invention,

A first step of recovering aluminum hydroxide from an aluminum waste stream;

A second step of pulverizing the recovered aluminum hydroxide and then sintering to produce a high purity alumina powder;

A third step of preparing a ceramic granule by mixing the alumina powder with an inorganic binder, an organic binder and a water-soluble agent to produce a ceramic ball;

A fourth step of drying the prepared ceramic balls;

A fifth step of heat-treating the dried ceramic balls at 800 to 1000 ° C; And

And a sixth step of firing the heat-treated ceramic balls at a temperature of 1500 to 1700 ° C. The present invention also relates to a method for producing a high purity alumina ceramic ball using the aluminum wasted loss.

According to the present invention, it is possible to effectively recover aluminum metal from the discarded aluminum dross to produce high purity alumina, and to manufacture high purity alumina ceramic balls, thereby minimizing dross It is possible not only to reduce industrial wastes treatment cost and environmental protection effect due to the reduction of the manufacturing costs of the ceramic balls, but also to manufacture high purity alumina ceramic balls having high value-added in an environmentally friendly and economical manner.

The alumina ceramic balls manufactured according to the present invention are excellent in mechanical properties and porosity, and have sufficient porosity, high strength and high heat resistance to maintain smooth fluid flow in chemical processes for producing petrochemicals and specific chemical products, It can serve as a catalyst support.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a method for producing high purity alumina ceramic balls from aluminum pedes according to the present invention.
Fig. 2 shows a recovery flow chart of aluminum hydroxide from aluminum dross.
3 is a photograph showing aluminum hydroxide recovered from an aluminum dross in an embodiment of the present invention.
Figure 4 shows the XRD analysis results of precipitated aluminum hydroxide in one embodiment of the invention (a: recovered aluminum hydroxide, b: reagent grade aluminum hydroxide).
Figure 5 is a test report showing the results of ICP analysis of precipitated aluminum hydroxide in one embodiment of the present invention.
Figure 6 shows the FE-SEM analysis of precipitated aluminum hydroxide in one embodiment of the invention (a: recovered aluminum hydroxide, b: reagent grade aluminum hydroxide).
Figure 7 shows the XRD analysis results of aluminum hydroxide recovered in one embodiment of the present invention.
8 is a test report showing the result of ED-XRF analysis of aluminum hydroxide recovered in an embodiment of the present invention.
FIG. 9 is a test report showing the result of analyzing the composition of the alumina powder produced in one embodiment of the present invention.
10 shows SEM analysis results of the high purity alumina ceramic balls manufactured in one embodiment of the present invention.

Hereinafter, the present invention will be described in detail.

According to an aspect of the present invention,

A first step of recovering aluminum hydroxide from an aluminum waste stream;

A second step of pulverizing the recovered aluminum hydroxide and sintering to produce an alumina powder;

A third step of preparing a ceramic granule by mixing the alumina powder with an inorganic binder, an organic binder and a water-soluble agent to produce a ceramic ball;

A fourth step of drying the prepared ceramic balls;

A fifth step of calcining the dried ceramic balls at 800 to 1000 ° C; And

And a sixth step of firing the heat-treated ceramic balls at 1500 to 1700 ° C.

The following steps will be described in more detail.

First, the first step of the present invention is a step of recovering aluminum hydroxide from aluminum wasted loss. The metal aluminum remaining in the aluminum dross to be discarded is recovered as aluminum hydroxide. When the aluminum dross is crushed, And the small particles have a high content of oxides. Therefore, when the particles are large, they are recovered as aluminum metal through redissolution. When the particles are small, aluminum hydroxide is recovered by stirring and leaching using sodium hydroxide solution . Therefore, preferably, the first step comprises: crushing the aluminum waste dross and classifying it according to the particle size; Mixing and agitating a wasted drop having a small particle size into an NaOH solution, leaching and filtering to obtain an aqueous sodium aluminate (NaAlO ₂ ) solution; Adding an acid to the aqueous solution to precipitate aluminum hydroxide, and separating the residue by solid-liquid separation; And washing and drying the separated residue. At this time, according to one embodiment of the present invention, the highest recovery was economically achieved at the NaOH concentration of 20%, and it was confirmed from the physical property analysis that the recovered precipitate was porous aluminum hydroxide having a purity of 97.5%.

Next, the second step of the present invention is a step of grinding the recovered aluminum hydroxide and then sintering to produce an alumina powder. The recovered aluminum hydroxide is pulverized to improve sinterability and then sintered to obtain a high purity alumina Al ₂ O ₃ ) powder. When the high-hardness alumina has improved mechanical and thermal properties, it can have excellent physical properties when it is processed as a ceramic support including a ceramic ball, which depends on the microstructure of the ceramics in the manufacturing process. Therefore, it is preferable that the recovered aluminum hydroxide is pulverized and sintered at a temperature of 1100 to 1300 캜 for 30 minutes to 1 hour. Hardness and relative density, it has a porous microstructure at the time of sintering in the above range, and the relative density and hardness required as a ceramic support As shown in FIG.

Next, in the third step of the present invention, the alumina powder is mixed with an inorganic binder, an organic binder, and a water-soluble agent to prepare a ceramic granule, and the ceramic ball is produced by recycling. In one embodiment of the present invention, the alumina powder, the inorganic binder, the organic binder, and the water-soluble agent are added to the granulator, and the granules are prepared by initially blending the alumina powder in a fine and fine state and adding the additives little by little. Thereby producing a ceramic ball having a predetermined size. At this time, it is necessary to appropriately blend an inorganic binder and an organic binder in order to form a suitable porous structure as a ceramic support while having a compressive load and a heat resistance required for a finally produced ceramic ball. Accordingly, preferably 60 to 70 parts by weight of the alumina powder, 10 to 20 parts by weight of the inorganic binder, 2 to 10 parts by weight of the organic binder and 10 to 20 parts by weight of the water-soluble binder are mixed.

More preferably, the inorganic binder is selected from the group consisting of silica, silica sol, quartz, fused or amorphous silica, sodium silicate, amorphous aluminosilicate, alkoxysilane, silicone resin binder, clay, talc or a mixture of any two or more thereof Lt; / RTI >

More preferably, the organic binder is selected from the group consisting of polyacrylamide, polyethylene oxide, epoxy binder, polyvinyl alcohol, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxylmethylcellulose, polyvinyl acetate, refined starch, dextrin, polyvinyl (Meth) acrylate, paraffin, wax, polyethylene glycol, and an organic oil.

Still more preferably, the organic binder further comprises a surfactant comprising a nonionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant or a combination thereof.

Next, the fourth step of the present invention is a step of drying the ceramic balls. As a step for removing moisture in order to produce a high purity alumina ceramic ball finished product by calcining and firing, it is preferable to dry at 60-100 ° C for 1-2 days.

Next, the fifth step of the present invention is a step of heat-treating the dried ceramic balls at 800 to 1000 ° C to prevent cracking of the product due to a sudden increase in temperature and to form a porous support by volatilizing the organic binder It is preferable to raise the temperature at a temperature raising rate of 2 to 5 占 폚 / min and calcination by heat treatment at 800 to 1000 占 폚 for 2 to 4 hours.

Next, the sixth step of the present invention is a step of firing the heat-treated ceramic balls at 1500-1700 DEG C, and the high-purity alumina ceramic ball finished product has high strength and high heat resistance by the firing. Also, since the organic binder is carbonized at this stage and the odor and smoke are discharged, it is necessary to optimize the compounding ratio in the third step. Also, it is preferable that the porous high purity alumina ceramic balls are baked for 2 to 4 hours in order to have high strength and high heat resistance required in the present invention.

Hereinafter, the present invention will be described in detail with reference to examples, but the scope of the present invention is not limited thereto.

Example 1 Recovery of aluminum hydroxide from aluminum dross

1-1 Aluminum (Al) < RTI ID = 0.0 > (OH) ₃  collection

When aluminum dross is crushed, a large particle contains a large amount of metal, and a small particle shows a high oxide content. The NaAlO ₂ aqueous solution (pH = 15) obtained by filtration of the leached solution was hydrolyzed to obtain Al (OH) 2 ) ₃ was precipitated. The precipitated Al (OH) ₃ was filtered, washed with distilled water and dried until Na ions disappeared. The manufacturing process is shown in Fig. 2, and the aluminum dross is produced from a domestic die casting company (Al dross, Hanzhou Metal Co., Ltd.).

When the Al in the dross is leached out with NaOH solution, the reaction in the solution is a 1: 1 reaction between Al and NaOH. Therefore, the recovery rate of Al (OH) ₃ in this embodiment was calculated according to the following formula.

R: Recovery rate of Al (OH) ₃ (when all metal aluminum components in the dross are leached)

· W: Weight of sample

· W (Al): The amount of metallic Al in the loading dross

M: Molecular weight

(1) Recovery of Al (OH) ₃ according to the amount of aluminum dross using 200 ml of 20% NaOH by the above method is shown in Table 1 below.

NaOH concentration (%) The amount of dross (g) Drying (g) yield(%) 20 45 19.86 60.9 20 35 14.70 57.9 20 25 8.17 45.0 20 15 2.09 19.2

(2) Al (OH) ₃ was recovered by varying the concentration of NaOH and the amount of Al dross according to Table 1, using a 10 L double jacket reactor. The results are shown in Table 2 below.

Volume Al (OH) ₃ [g] yield(%) 1L 81.62 45.05 2L 129.15 55.9 3L 286.7 63.75 5L 314.84 62.8 7L 557.76 62.7

As shown in Table 2, it was possible to establish a yield condition of up to 63.75% in the 10 L reaction process.

1-2 Al (OH) ₃ Physicochemical characterization of

(1) FIG. 3 shows a precipitate in the form of a white powder obtained by leaching 45 g of aluminum dross in a 20% NaOH solution and hydrolyzing the filtrate according to the above Example 1-1.

FIG. 4 shows the result of analyzing the precipitate by X-ray diffraction method, and it was confirmed to be Al (OH) ₃ . FIG. 4 (a) shows the XRD data of the recovered precipitate, and FIG. 4 (b) shows the standard X-ray diffraction curves of the reagent grade Al (OH) ₃ (purchased from Sigma Aldrich) It was confirmed that the peaks corresponded to the Al (OH) ₃ standard X-ray characteristic peaks at 29 to 41 °. The XRD data also indicates that Al (OH) ₃ crystals grow properly due to the addition of NaOH.

As a result of calculating the size of the primary crystal grains on the XRD pattern using the Scherrer equation, it was confirmed that the size of the recovered Al (OH) ₃ grains was 0.262 μm and the size of the standard Al (OH) ₃ grains was 0.523 μm .

(2) The purity of Al (OH) ₃ was analyzed by ICP and XRF.

FIG. 5 shows a test report for the result of the analysis by ICP, and it was confirmed that the purity of Al (OH) ₃ reached 97.5%.

The recovered Al (OH) ₃ and reagent grade Al (OH) ₃ (purchased from Sigma Aldrich) were analyzed by XRF (ANALYTICAL Co., Axios Minerals). The results are shown in Table 3 below. As a result of the XRF analysis, it was confirmed that the Al purity of the recovered Al (OH) ₃ was 90%. The content of Na and Si is higher than the Al purity of reagent grade Al (OH) ₃ due to the fact that the NaOH on the surface and internal pores of the sample after Na leaching is not sufficiently cleaned. In the case of Si, It is believed that this is due to the partial leaching of the Si component mixed with

Al Sr Na Si K Fe Ga SO The recovered Al (OH) ₃ 90.6 0.01 2.24 6.67 0.43 0.24 0.01 Reagent grade Al (OH) ₃ 97.5 << 1.2 << << 0.94

(3) The FE-SEM (HITACHI., S-2400) analysis was also performed to observe the morphology and surface of the recovered Al (OH) ₃ and reagent grade Al (OH) ₃ (purchased from Sigma Aldrich) The results are shown in Fig.

As shown in Fig. 6 (a), it was confirmed that the recovered Al (OH) ₃ was not sufficiently crystallized and fine particles were aggregated.

Factors affecting particle size in the precipitation reaction by hydrolysis include reaction time, stirring speed, reaction temperature, etc., which commonly affect nucleation rate. When the agitation speed is low, the rate of reaction mass transfer to the surface of the particles decreases and the rate of nucleation decreases as the reaction rate decreases. Thus, the number of nuclei is reduced while the mass per particle increases. Also, the nucleation rate is increased according to the reaction temperature, and the particle size is decreased. Therefore, as compared with reagent grade Al (OH) ₃ from the result of the Al (OH) ₃ number of Al by selecting a precipitation method according to the usage of the bar, the product to apply doeeotneun determined that did not have enough time for crystal growth during precipitation (OH) &lt; ₃ &gt;

Example 2: Production of alumina from recovered aluminum hydroxide

2-1 Analysis of composition of raw material powder

Since the composition of the raw material powder is most dominant in the composition of the sintered body, the compositional analysis of the aluminum hydroxide powder recovered in Example 1 as raw material powder was performed prior to sintering. The main phase was identified by alumina through XRD and analyzed more qualitatively by ED-XRF.

FIG. 7 shows the results of XRD analysis of the raw material powder, and it can be confirmed that the main composition of the raw material powder is? -Alumina through the main peaks at between 35 and 70 °. This is because calcination of Al (OH) ₃ obtained from the recovery process results in alumina coming out. The reaction is as follows.

2Al (OH) ₃  → Al ₂ O ₃  + 3H ₂ O

In addition to the main composition of the raw material powder, the ED-XRF method was used for more accurate composition analysis of the impurities which may affect the composition of the final sintered body.

FIG. 8 shows the composition of the raw material powder measured by the ED-XRF method, which is represented by Al 85 wt%, Si 4 wt%, S 6 wt% and Cl 1 wt%.

2-2 Fabrication of alumina powder by sintering raw material powder

(1) As analyzed in Example 2-1, aluminum hydroxide powder containing 85 wt.% Of Al and 4 wt.% Of Si was pulverized to an average particle size of about 12.5 μm using a pulverizer. This was placed in a 20 mm dia. × 5 mm graphite mold and sintered by sintering conditions (holding time, operating pressure, holding temperature). When putting the powder into the mold, a graphite film having a thickness of 0.2 mm was put in order to prevent adhesion between the sintered body and the mold. The heating rate was fixed at 50 ° C / min. Sintering was performed by raising the heating rate to 50% before 50 ° C. The sintering temperature was 900 ~ 1300 ℃, the operating pressure was 5 ~ 100 MPa, and the holding time was 0 ~ 50 min.

(2) Relative density and hardness of sintered body according to sintering conditions were measured, and the results are shown in Tables 4 to 6 below.

At this time, relative density and hardness were measured by the following method.

- Relative density: Each specimen was impregnated in paraffin until no bubbles were formed, and the weight was measured by water. The bulk density (D _b ) was measured according to the following formula, and the ratio of the bulk density to the theoretical density (D _th ) (The theoretical density is calculated from the composition of the raw material powder and the density of the constituent elements by using a rule of mixture).

(W1: weight (g) of the sample in air,

W2: Weight of paraffin impregnated specimen in air (g)

W3: Water weight (g) of paraffin impregnated specimen,

ρ1: density of water)

- Hardness: Vickers hardness is measured by the following equation using a Vickers hardness tester.

Hv: Vickers hardness

F: Test load (N)

S: surface area of the recess (mm ² )

d: average length of the diagonal line of the concave portion (mm)

Θ: Face-to-face angle (136 °)

Table 4 shows the relative density and hardness of the specimen according to the sintering temperature. As the temperature increased, the relative density increased but the hardness was not significantly different.

Table 5 also shows the relative density and hardness of the specimen according to the sintering pressure at 1300 ° C, reflecting the results of Table 4. The relative density and hardness were not significantly different from each other. Therefore, it is considered that sintering temperature is more affected than sintering pressure.

Also, Table 6 shows the relative density and hardness of the specimen according to the holding time. As the holding time increases, the relative density increases but the hardness decreases. As a result, the porosity decreases. When the porosity is too high, the produced ceramic balls can not withstand external impacts. On the contrary, even if the porosity is too low, the mechanical properties of the ceramic balls are rather reduced due to the low hardness.

The relative density of the sintered body increases as the sintering time increases and the relative density is particularly affected by the temperature. Therefore, in order to obtain a high relative density of 90% or more, .

(3) Based on the above results, the composition of the sintered powder prepared by holding at 1300 ° C under a pressure of 100 MPa for 30 minutes was analyzed, and the test result was shown in FIG. As shown in FIG. 9, the purity of alumina (Al ₂ O ₃ ) was found to be 94.8%.

&Lt; Example 3 > Production of ceramic balls

An inorganic binder, an organic binder and a water-soluble agent were added to the alumina powder prepared in Example 2 to prepare a ceramic ball while controlling the mixing ratio.

Specifically, the production method is as follows.

First, an inorganic binder, an organic binder, and a water-soluble agent were added to and mixed with the alumina powder prepared in Example 2 in the granulator, and then the particles were uniformly prepared in a circulating machine and dried at 80 ° C for 24 hours. In order to prevent cracks due to abrupt temperature change, the temperature was raised at a rate of 3 ° C / min, and then heat-treated at 900 ° C for 3 hours in a calcination furnace, again heated at 1600 ° C for 3 hours, After the ball was completed, it was divided into sizes using a sieve.

As the inorganic binder, silica sol and clay were used, and organic binders such as dextrin, PVA, CMC and organic oil were used. Surfactants were used and water was used as a water-soluble agent.

The compounding ratios and the respective compression load test results are shown in Table 7 below.

Al ₂ O ₃  Powder Sillica zol Clay dextrin PVA CMC abandonment
oil Interfacial agent water Compressive load
Test result JET-1 60 5 15 - - - - - 20 1,382kg JET-2 60 10 10 - - - - - 20 2,486kg JET-3 60 15 5 - - - - - 20 2,259kg JET-4 60 10 8 - - - One One 20 1,876kg JET-5 60 8 10 One One 20 1,665kg JET-6 60 10 10 4 2 2 One One 10 3,212 kg JET-7 70 5 10 - - - - - 10 2,058kg JET-8 70 10 5 - - - - - 10 2,391kg JET-9 70 5 5 4 2 2 One One 10 3,170kg

As shown in Table 7, when a ceramic ball was produced by adding only an inorganic binder (JET-1, 2, 3, 7, 8), the compressive load was 1,382 to 2,486 kg, However, since the content of the inorganic binder is large, there is a disadvantage that the odor and smoke of toxic are discharged during the calcination and calcination.

In addition, it was confirmed that when a ceramic ball was prepared by adding an inorganic binder and an organic binder (JET-4, 5, 6, 9), the compression load was considerably high at 1,665 to 3,212 kg. However, as the addition amount of the organic binder increases, the yield of the product decreases in the course of calcination and firing, and it has been confirmed that the addition amounts of the organic binder and the inorganic binder need to be properly blended.

FIG. 10 shows SEM results. The ceramic balls manufactured according to the above-described blend are used to serve as a catalyst support, and must maintain high strength and smooth flow of liquid, thereby improving the performance of a product to be produced. Therefore, the porosity of the produced ceramic balls was confirmed by SEM.

10, JET-1, JET-2, and JET-4 did not add inorganic and organic binders, so that the product did not aggregate sufficiently. As a result, it was confirmed that the porosity was not sufficiently secured. -6, and JET-9, the pores were sufficiently secured when the organic and inorganic binders were added. Thus, the compressive load was not reduced and the value was equal to or higher than that of other products.

From the above results, it was judged that JET-9 was the most suitable when the compression load was not less than 3000 kg and the yield and economical efficiency of the product were taken into consideration. The result of the evaluation of JET-9 was shown in FIG. As shown in FIG. 11, it can be confirmed that the ceramic balls manufactured according to the present invention have excellent compressive load and heat resistance.

As described above, according to the present invention, Al (OH) ₃ is recovered from aluminum waste dows classified as waste, and the recovered Al (OH) ₃ is pulverized and sintered and then mixed with a binder or the like. By manufacturing a ball, it is possible to produce a porous ceramic ball having excellent heat resistance and compressive strength and having a high porosity and a high heat resistance. Therefore, it is expected that the waste resource can be utilized as a high value-added ceramic support according to the present invention.

Claims (11)

A first step of recovering aluminum hydroxide from an aluminum waste stream;
A second step of pulverizing the recovered aluminum hydroxide and then sintering to produce a high purity alumina powder;
A third step of preparing a ceramic granule by mixing the alumina powder with an inorganic binder, an organic binder and a water-soluble agent to produce a ceramic ball;
A fourth step of drying the prepared ceramic balls;
A fifth step of heat-treating the dried ceramic balls at 800 to 1000 ° C; And
And a sixth step of firing the heat-treated ceramic balls at 1500 to 1700 占 폚. The method according to claim 1,
In the first step,
Crushing the aluminum waste dough and classifying it according to the particle size;
Mixing and agitating a wasted drop having a small particle size into an NaOH solution, leaching and filtering to obtain an aqueous sodium aluminate (NaAlO ₂ ) solution;
Adding an acid to the aqueous solution to precipitate aluminum hydroxide, and separating the residue by solid-liquid separation; And
And washing and drying the separated residue. The method for producing a high purity alumina ceramic ball using aluminum waste dope according to claim 1, The method according to claim 1,
The second step comprises:
Wherein the recovered aluminum hydroxide is pulverized and then sintered at a temperature of 1100 to 1300 캜 for 30 minutes to 1 hour to produce an alumina powder. The method according to claim 1,
In the third step,
Wherein 60 to 70 parts by weight of the alumina powder, 10 to 20 parts by weight of an inorganic binder, 2 to 10 parts by weight of an organic binder and 10 to 20 parts by weight of a water-soluble binder are mixed to prepare a ceramic granule body. Process for producing high purity alumina ceramic balls. 5. The method of claim 4,
Wherein the inorganic binder is selected from the group consisting of silica, silica sol, quartz, fused or amorphous silica, sodium silicate, amorphous aluminosilicate, alkoxysilane, silicone resin binder, clay, talc or a mixture of any two or more thereof Wherein the alumina ceramic balls are made of aluminum. 5. The method of claim 4,
The organic binder may be selected from the group consisting of polyacrylamide, polyethylene oxide, epoxy binder, polyvinyl alcohol, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxylmethylcellulose, polyvinylacetate, refined starch, dextrin, polyvinylbutyral, polymethyl Wherein the alumina ceramic ball is at least one member selected from the group consisting of poly (meth) acrylate, paraffin, wax, polyethylene glycol and organic oil. The method according to claim 6,
Characterized in that the organic binder further comprises a surfactant comprising a nonionic surfactant, an anionic surfactant, a cationic surfactant, a zwitterionic surfactant or a combination thereof. The high purity alumina ceramic A method of manufacturing a ball. The method according to claim 1,
In the fourth step,
Wherein the ceramic ball is dried at a temperature of 60 to 100 ° C for 1 to 2 days to produce a high purity alumina ceramic ball. The method according to claim 1,
Wherein the calcination and calcination are performed for 2 to 4 hours. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt; The method according to claim 1,
And a seventh step of classifying the sintered ceramic balls according to the particle size. The method of manufacturing high purity alumina ceramic balls according to claim 1, A high purity alumina ceramic ball using an aluminum waste draw furnace, which is produced by the method of any one of claims 1 to 10.

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