KR100541463B1 - Monitor surface grinding powder slaggy recycle method for flow water specific gravity sorting type - Google Patents

Abstract

The present invention discloses a method for recycling CRT sludge by wet specific gravity screening to recycle abrasive sludge discharged from abrasive when polishing a surface of a glass product using an abrasive in an electronic industry such as CRT.

A concrete method is a recycling method using sludge which discharges sludge composed of abrasive and glass scrap in a polishing process of a TV CRT through a concentration and dehydration process in a cake state, wherein water is discharged from the sludge discharged through the sludge discharge process. The mineral liquid concentration control process for controlling the mineral liquid concentration by adjusting the water content of the sludge by adding a sludge, the sludge crushing process for crushing the sludge that has undergone the mineral liquid concentration control process into a crusher, and the crushed sludge water flow The main purpose of the classification process is to separate and recover the garnet, perm and fine sludge using a selector plate specific gravity sorter.

Wet Specific Grading, Abrasive Sludge, Recycling, Garnet, Permise

Description

Monitor surface grinding powder slaggy recycle method for flow water specific gravity sorting type}

1 is a process chart showing a recovery process of abrasive from the abrasive sludge according to the present invention.

Figure 2 is a graph showing the XRD pattern of the raw material perm and perm recovered by the wet specific gravity method of the present invention.

Figure 3 is a graph showing the XRD pattern of the raw material garnet and garnet recovered by the wet specific gravity screening method of the present invention.

The present invention relates to an abrasive sludge recycling method for recycling the abrasive sludge discharged from the abrasive when polishing the surface of the glass product using the abrasive in the electronic industry such as CRT, in particular, the concentration and dehydration process after polishing Regarding the recycling method of brown tube abrasive sludge by wet specific gravity method to separate and recover the garnet and perme abrasive which can be recycled from the abrasive sludge that has been disposed of in the cake state and the fine particles which can be used as special cement and ready-mixed concrete admixture will be.

In general, super-magnetic flux, such as TV CRT, melts raw materials at a high temperature, injects and solidifies a molten liquid into a predetermined mold to produce a certain type of product. The surface of the product detached from the mold is not smooth.

Therefore, in the production process of TV CRT, various inorganic abrasives are used to improve polishing and gloss to improve surface smoothness and maintain gloss.

In the polishing process, sludge mixed with the used abrasive and the glass scrap detached from the CRT is generated.

On the other hand, most of such abrasives are difficult to produce domestically, and raw materials are imported from foreign countries, processed domestically, and supplied to consumers.

The polishing process is divided into three stages: rough polishing, fine polishing and polishing. Since each process has a different purpose, the kind of abrasive used also differs. As the abrasive used mainly in Korea, the abrasive powder is used as a powder (pumice), the fine grinding material is used as a garnet (garnet) powder, in the polishing process is a rare earth mineral rouge (rouge) powder is used. Each abrasive has a difference in particle size, but most of them are used to finely adjust the particle size to prevent surface scratches of the superfluous flow.

In addition, in the polishing process, the abrasive is continuously supplied in a predetermined amount, and the abrasive supplied first is discharged to the sludge together with the glass scrap. The discharged sludge is discharged as cake through concentration and dehydration process and landfilled as waste or used as a part of cement raw material.

However, in the past, sludge is used as landfill disposal or cement part raw materials due to the lack of physical separation and recovery techniques, so when landfilling, there are various problems such as securing landfill and expenses for recycling. The landfill disposal of the company causes a lot of losses at the national level.

In addition, the added value of cement is not expected to be a technology that is not expected to be simply buried rather than recycled, which can improve value added.

As such, no technology development has been attempted for recycling sludge in Korea. In particular, the amount of the loose powder is very small, the ratio of mixing into the sludge is very low, the particle size is small, it is difficult to recycle by physical methods.

In Korea, an attempt to recycle abrasive sludge is loose recycle technology. In order to recycle the rouge, it has been attempted to develop the technology for recycling by recrystallization method after ionizing the rouge particles with a chemical leaching method, but the remaining 95% for the recycling of rouge, which is less than 5% of the total sludge. Other sludges are also very difficult to commercialize because they are very unreasonable in the process of depositing them in a special acid and concentrating, dehydrating and drying them.

Therefore, until now, at home and abroad, the development of physical treatment technology for recycling CRT sludge has not been attempted at all.

The present invention has been made in view of the above-described problems, and after crushing the conventional abrasive sludge, which is discarded in a cake state through a concentration and dehydration process after grinding in a scrubber, the crushed abrasive is water flow (water flow) CRT by wet gravity screening method, which can contribute to the supply and demand of abrasives and special cement raw materials depending on imports by enabling the recycling of waste resources by separating and selecting by type according to the physical quantity difference such as particle size and specific gravity The object is to provide a method for recycling abrasive sludge.

Recycling method of the brown tube abrasive sludge by the wet specific gravity method of the present invention for achieving the above object,

A recycling method using sludge which discharges sludge consisting of abrasives and glass scrap into a cake state through a concentration and dehydration process in a polishing process of a TV CRT, wherein water is added to the sludge discharged through the sludge discharge process. A mineral liquid concentration adjusting process for controlling the mineral liquid concentration by adjusting the moisture content, and a sludge crushing process for disintegrating the sludge that has been subjected to the mineral liquid concentration adjusting process to the crusher;

The crushed sludge is characterized in that it comprises a classification process for separating and recovering the garnet, perm and fine sludge using a selection plate specific gravity separator using a water stream (water flow).

The mineral liquid concentration control process of the present invention adds water to the sludge to be 50% by weight.

In addition, the fine particles having an average particle diameter of 2.5 μm or less in the fine sludge recovered in the classification process are used as a special cement raw material or ready mixed concrete.

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

1 is a process chart showing a recovery process of abrasives from abrasive sludge according to the present invention, in which polishing sludge is discharged in the process of polishing the glass surface of the electronics industry in three stages of polishing of garnet, permise and cerium oxide. The discharged abrasive sludge is collected in a slurry storage tank and is discharged as a cake through concentration and dehydration.

At this time, the size of the abrasive used has a significant difference in the particle size of garnet 14.3㎛, perm 130.2㎛, cerium oxide 4.0㎛, specific gravity is different from garnet 4.3, Permis 2.7, each by wet specific gravity screening method It is an important factor to separate the abrasives by type. As described above, the sludge discharged in the cake state contains about 40% of water.

Next, water is added to the sludge discharged in the cake state as described above to adjust the mineral liquid concentration so that the water content of the sludge is 50% by weight, which is adjusted to the coarse particles in the subsequent disintegration process by controlling the mineral liquid concentration of the sludge This is to prevent the deterioration of the recovered product by allowing the attached particulate sludge to be separated.

Subsequently, the sludge in the form of cake which has undergone the mineral liquid concentration process is introduced into a crusher such as a scrubber, and then pulverized for 4 to 5 minutes. During the disintegration process, the disintegration machine simply disintegrates and does not reduce the particle size. However, if the disintegration is performed for a long time, the separation between the particles will be good, but it is limited to within 5 minutes since the acute angle of the abrasive may be slowed down. This is because the polishing performance may be lowered when the acute angle is slowed down.

Finally, the crushed sludge as described above is supplied to the selection plate specific gravity sorter together with water to sort and recover them by the difference in particle size and specific gravity of each sludge particle.

 At this time, the inclination angle of the selection plate specific gravity selector is 2 °, and the Chungjeongsu, which is the number of forward and backward movements of the selection plate, is preferably driven at about 250 times per minute.

Each of the particles contained in the sludge supplied with water on the upper part of the effluent plate operates as described above and flows out of the effluent plate while forming different trajectories under the influence of the forward and backward motion of the effluent plate and the flow of water flowing from the upper part. do.

Here, the trajectory of each particle in the cut plate has a high specific gravity and relatively fine garnet flows down the top, followed by a low specific gravity and coarse permeate, and the fine particles containing rouge are far away with water. As it flows down, each abrasive is separated and selected and recovered.

The recovered garnet and permise can be used as recycled abrasives, and the sludge fine particles having an average particle diameter of 20 μm or less among the fine particles flowing down with water are concentrated, dehydrated, dried, and crushed to be used as special cement raw materials or ready mixed concretes. It is possible.

An embodiment of the present invention will be described in more detail.

<Example>

The sludge in the cake state is adjusted to 50% of the mineral solution concentration and then disintegrated and supplied to the rocking table with water. At this time, the concentration of the mineral liquid is about 20%, the inclined plate is about 2 °, and the Chungjung water is divided about 250 times.

If specific gravity selection is performed under these conditions, the particles will behave differently in the water stream due to the size and specific gravity of the particles.The garnet is placed in the upper part of the select plate, and the perm is placed in the middle part. The lamps flow down the water with the water in the opposite direction, and can be separated by particles.

Meanwhile, as a result of performing X-ray diffraction analysis to check the quality of the recovered product, the patterns shown in FIGS. 2 to 3 were obtained.

2 to 3 are graphs showing the results of XRD analysis of each abrasive before polishing and the abrasive recovered by the wet screening method of the present invention. As can be seen from this, the recovered products are compared to the raw materials. The results showed similar peaks, and in particular, the results of the user's application experiments with abrasive companies showed that the garnet had similar polishing performance to Permis before use.

Table 1 below shows the results of analyzing the production rate of each product recovered by the wet gravity screening method of the present invention and the constituent material by XRD.

Product Name Production rate (WT.%) Component by XRD Permis 36 Amorphous Garnet 33 Majorite, Quartz Fine sludge 31 Quartz, Kesterlite, Fluocerite

As shown in Table 1, the recovered abrasives showed that Permis, which was originally an amorphous silica product of volcanic origin, also exhibited an amorphous peak, and garnet showed majorite and quartz. Similar peaks appeared.

The above results suggest that the selection of raw materials contained in the abrasive sludge was effectively performed by wet specific gravity screening. In particular, since abrasives are the most important matters in actual use, as a result of conducting a user-applied experiment conducted by a company that discharges abrasive sludge to investigate abrasive performance, Permis and Garnet abrasives have similar abrasive performances as natural abrasives. The same conclusions as the above-described XRD results were confirmed to be sufficiently reusable.

Meanwhile, the results of particle size analysis and X-ray diffraction analysis for characterization of garnet and permis abrasives are as follows.

 In other words, X-ray diffraction analysis showed that each raw material used as an abrasive was X-ray diffraction analysis, and garnet ore contained majorite and garnet quartz as impurities and most permeate ore was composed of amorphous particles. And it was found.

In addition, the average particle diameter of the garnet raw material was 13㎛, it was found that the average particle diameter of the permise raw material is 75㎛. Using these raw materials, the surface of the CRT was ground and the average particle diameter of the sludge discharged was 10.923 µm.

Table 2 below shows the characteristics of the abrasive recovered by the wet sorting method of the present invention.

Product Name Production rate (wt.%)  Average particle size (㎛)  Hematite mineral Remarks Raw material 100.00 13  Majorite, Quartz, Amorphous Garnet 16.10 11 Almandine, Quartz, Calcite Permis 12.81 55 Cristobalite, amorphous Particulate 70.99 2.7 Quartz, Kesterite, Flurocerite, Amorphous

As can be seen from Table 2, the average particle diameter of the garnet recovered is 11㎛, which can be seen that the size is almost similar to the average particle diameter 13㎛ of the above-described garnet raw material. This is because garnet is a hard mineral, so that the damage of the particles hardly occurred during polishing.

On the other hand, the recovered perm average particle diameter was 55 µm, which was slightly smaller than the average particle diameter of 75 µm before the polishing raw material. This is because Permys is a relatively soft mineral, which was attributed to particle damage in the abrasive home. Such a phenomenon was also confirmed by the optical microscope inspection.

In addition, the recovered garnet was majorite and quartz, and the recovered perm was amorphous and a small amount of majorite, but the two raw materials were mixed slightly, but majorite was found to be composed of minerals similar to the raw material in a small amount.

As a result of the above particle size analysis, rock formation mineral analysis and optical microscope observation, it was found that the present invention is a technology that can recover the recycled abrasive from the polishing sludge.

On the other hand, the possibility of application for the special cement for blocking the microcracks was recycled to recycle the remaining fine particles.

The essential matters for the prevention of microcracking are that fine particles can penetrate into the microcrack, so the fine particles should be used as much as possible, and the gel state should be maintained for a certain time. Therefore, the existing additives were added at the same ratio and tried to replace the raw materials similar to the sludge. As a test method, a special cement test method was applied. Gel-time was performed by KIG-1, Mohogel compressive strength by KIG-2, and powder by KIG-3. The raw materials currently used are A, B, C three kinds of special cement is manufactured. Therefore, as a result of examining physical properties while changing the mixing ratio for the use of sludge fine particles, the same results as described in Table 3 were obtained.

Table 3 below shows the results of special cement production using particulate sludge.

Blending raw materials (A: B: C: Sludge) gel-time Compressive strength (㎏ / ㎠) Powder level (㎠ / g) Remarks Temperature (℃) Time (sec) 1 day later 3 days later 7 days later  7: 3: 1.5: 0 18.5 52 3.0 6.9 15.8 7920 Current formulation 6: 3.5: 1.5: 0.5 17.5 60 5.0 11.8 18.6 8150 5.5: 3.5: 1.5: 1 18.5 52 6.3 10.2 15.4 8240 4: 4: 1.5: 2 18.0 57 5.0 9.7 12.0 8440 4.5: 3.5: 1.5: 2 18.0 62 5.0 10.1 16.5 8390

As can be seen from Table 3 above, when no sludge was added, the gelation time was about 52 seconds, which varies depending on the mixing ratio but was extended up to 62 seconds, and the initial compressive strength was considerably improved compared to the current mixing ratio. Even after 7 days of near completion, the existing product showed almost similar or excellent result. In particular, the powder level of the raw material to which the sludge was added was found to be much higher than that without the addition of the sludge.

In addition, the result that the powder is high and the gelation time is extended predicts that the cement particles can penetrate into the fine cracks and thus have an excellent effect on the removal of the cracks. In particular, the sludge is similar to cement, which is advantageous for the color of the product, and thus shows excellent characteristics as a special cement raw material.

According to the recycling method of the CRT sludge according to the wet specific gravity method applied to the present invention as described above, garnet and perme contained in the discarded abrasive sludge are recovered and recycled into the abrasive, and the remaining sludge is used as a special cement additive. In addition to reducing brown and manufacturing costs, the quality of special cements and the added value of sludge can contribute to the improvement.

In addition, it is possible to contribute to the supply and demand of abrasives and special cement raw materials depending on imports due to the recycling of discarded resources, which is very advantageous in terms of national economics.

Claims (3)

In the recycling method using the sludge which discharges the sludge composed of abrasive and glass scrap in the polishing process of TV CRT through the process of condensation and dehydration in the cake state, A mineral liquid concentration adjusting step of controlling the mineral liquid concentration by controlling water content of the sludge by adding water to the sludge discharged through the abrasive sludge discharge process; A sludge crushing process for crushing the sludge that has undergone the mineral liquid concentration control process by crushing the sludge; Brown tube abrasive sludge by the wet specific gravity method, characterized in that it comprises a classification process for separating and recovering the disintegrated sludge into garnet, permis and fine sludge using a selection plate specific gravity separator using water flow (water flow); Method of recycling. The method of claim 1, The mineral liquid concentration control process is a brown and abrasive sludge recycling method of the wet specific gravity method characterized in that the water is added to the sludge so that 50% of the total weight of the dried sludge. The method of claim 1, Particles having an average particle diameter of 2,5 μm or less among the fine sludge recovered in the classification process are recycled to the CRT sludge by wet specific gravity method, characterized in that it is used as a special cement raw material or ready mixed concrete.

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