CN104986774A - Process and device for producing quartz sand powder for TFT-LCD (thin film transistor-liquid crystal display) base plate glass by utilizing quartz tail sand - Google Patents
Process and device for producing quartz sand powder for TFT-LCD (thin film transistor-liquid crystal display) base plate glass by utilizing quartz tail sand Download PDFInfo
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Abstract
The invention provides a process for producing quartz sand powder for TFT-LCD (thin film transistor-liquid crystal display) base plate glass by utilizing quartz tail sand. The method comprises the following steps that firstly, the content of impurities in the quartz tail sand is tested, and the acid washing treatment is carried out according to the content of Al2O3 in the quartz tail sand; materials subjected to acid washing are put into a reaction kettle, and any two kinds of mixed acid liquid from hydrochloric acid, nitric acid and fluosilicic acid are used for carry out acid washing to dissolve and remove iron in the materials; the quartz tail sand subjected to iron removal is washed by water to the neutral state and is then dehydrated, 160 to 300 meshes of quartz sand powder is separated out, and the quartz sand powder for TFT-LCD base plate glass can be prepared. The method has the advantages that the quartz tail sand can be effectively utilized, the quartz tail sand can be produced into high-additional-value quartz sand powder for the TFT-LCD base plate glass, and the goal of changing waste into valuables is achieved. The invention also provides a device used for the process.
Description
Technical field
The present invention relates to a kind of utilize quartz tail sand to produce TFT-LCD base plate glass quartz sand powder method and special device, belong to nonmetalliferous ore deep processing and environmental technology field.
Background technology
Quartz tail sand: as the term suggests it is the sand powder of the short or caudal end of most end in quartz sand processing process, is also byproduct.The order number of the tailings that quartz sand processing enterprise of current China produces mostly at 120 mesh sieves with down to interval ranges more than 400 mesh sieves, produce quartz tail sand per year in ten million ton, the Area, Fengyang County, Anhui that mainly distributes again, Heyuan, Linyi, Shandong, the He Lei village, Shahe, Hebei etc.Quartz tail sand is relative to finished product quartz sand (24 mesh sieves are down on 120 mesh sieves): the moisture that not only its particle diameter is little, specific surface area is large, surface energy is large, the time of precipitation is long, contained is high, impurity is many, difficult processing, drying are more difficult, and the market requirement only has a small amount of use factory as construction ceramic, cement industry and aerated bricks industry for building etc., its price is per ton looks its quality and different, and the tailings that quartz deposit produces is per ton about dozens of yuan; The quartz tail sand of other sedimentogeneous rocks is per ton in 10-15 unit not etc.Therefore, quartz tail sand not only becomes " chicken ribs " of each production quartz sand enterprise, but also must be special, larger cement court carries out storing, stacking.More make people's headache: the rainy day, quartz tail sand trickles everywhere with rainwater, seriously pollutes water resource environment; Fine day, when blowing, dust waves with the wind, seriously polluted air quality environment etc.So the general enterprise producing quartz sand all processes quartz tail sand as rubbish.
Along with the develop rapidly of scientific and technological level and the continuous progress of society, the standard of living of people and improving constantly of self diathesis, people's environmental consciousness also more and more strong.After newly revision on January 1st, 2015, " environmental law " comes into effect, and makes the environmental consciousness of people rise to again a new height.Get more and more about the comprehensive treating process of quartz tail sand and Utilizing question and cause and be subject to the very big concern of quartz sand processing enterprise and the whole society.Therefore, how scientifically, reasonably, fully, effectively utilize that China is existing, abundant, cheap quartz tail sand resource, develop market in urgent need and there is high technology content and high added value quartz tail sand product, and accomplish no pollution in production process, the modern technique of zero release and technique and device, be in face of we each silicon materials research and development technology personnel one of pendulum brand-new, be rich in epochal character and challenging problem.Inquiry Patents and documents and materials, do not retrieve about utilizing quartz tail sand to produce TFT-LCD base plate glass quartz sand powder patent literature.
Summary of the invention
The invention provides a kind of processing method adopting quartz tail sand to produce the special quartz sand powder of TFT-LCD base plate glass, solve the deficiency in background technology, the method effectively can utilize quartz tail sand, be produced into the special quartz sand powder of TFT-LCD base plate glass of high added value, realized the object turned waste into wealth.
The technical scheme that realizing above-mentioned purpose of the present invention provides is:
(1) utilize quartz tail sand to produce a technique for TFT-LCD base plate glass quartz sand powder, comprise the following steps: the content of the impurity in (1), test quartz tail sand, impurity comprises Al
2o
3, Fe
2o
3, K
2o and Na
2o, judges Al in quartz tail sand
2o
3content whether be greater than 2%;
(2), for Al
2o
3the quartz tail sand of content>=2%, quartz tail sand is put into reactor, hydrofluoric acid or silicofluoric acid is added in reactor, open to stir and pickling is carried out to quartz tail sand, after pickling, acid solution removed and reclaim, again flotation is carried out to the quartz tail sand after pickling, after flotation, quartz tail sand washing is extremely neutral, for subsequent use after centrifuge dehydration;
For Al
2o
3the quartz tail sand of content < 2%, quartz tail sand is put into reactor, in reactor, adds hydrofluoric acid or silicofluoric acid, open stirring and carry out pickling, be stirred to the Al in quartz tail sand
2o
3content < 0.1%, then acid solution removed and reclaim; By the quartz tail sand washing after pickling to neutral, for subsequent use after centrifuge dehydration;
(3), the material after process in step (2) is put into reactor, the mix acid liquor of in hydrochloric acid, nitric acid and silicofluoric acid any two kinds is adopted to carry out pickling, pickling 3 ~ 6 hours under the condition of 70-90 degree, with molten except the irony in material, finally material is cooled to room temperature, removes acid solution and reclaim;
(4), by removing the quartz tail sand after irony in upper step be washed with water to neutral rear dehydration, the 160-300 object quartz sand powder first isolated wherein dehydrates to the total content < 0.001% of chlorion, nitrate ion and fluorion in quartz sand powder with deionized water or electronic grade ultrapure water washing again; Or first with deionized water or electronic grade ultrapure water washing to the total content < 0.001% of chlorion, nitrate ion and fluorion in quartz sand powder and the 160-300 object quartz sand powder isolated again after dehydrating wherein, TFT-LCD base plate glass quartz sand powder can be obtained.
Step (1) if in the quartz tail sand of the new output of quartz tail sand, be 5-8% with clear water rinsing and by centrifuge dewatering to wherein moisture content, and then measure the content of impurity; If the long-term quartz tail sand stacked, then first pull an oar, then with clear water rinsing and with centrifuge dewatering extremely wherein moisture content be 5-8%, and then measure the content of impurity; If the quartz tail sand that moisture content is less than 5%, then directly measure the content of impurity.
Method for floating in step (2) is specific as follows: with hydrofluoric acid and alkali lye for adjusting agent, take amino dodecane as trapping agent, with No. 2 oil for pore forming material, float downward select dirt in the condition of pH=2.0-3.0.
The nitric acid that mix acid liquor in step (3) is specially hydrochloric acid that concentration is 20-33%, concentration is 10-30% and concentration be in the silicofluoric acid of 10-30% any two kinds according to the mixed acid solution of the volume ratio of 1:1.
In step (4), after isolating 160-300 object quartz sand powder, remaining quartz sand powder sieves again, collect 120 ~ 160 object sand powder, directly carry out selling or adopt Counter-impact flow pulverizer to be crushed to 160 ~ 300 orders, as TFT-LCD base plate glass quartz sand powder.
Present invention also offers a kind of for the device in above-mentioned technique, at least comprise reactor, vacuum deacidification system, vacuum multi-stage water tourie, the liner material of described reactor is stereotype, tetrafluoroethylene or silicon nitride ceramics, in reactor, at the bottom of distance still, 50 ~ 150mm place is provided with the double-deck sieve plate of tetrafluoroethylene material therein, in double-deck sieve plate, the shape of upper and lower two-layer sieve plate is identical, and be provided with one block of filter cloth between upper and lower two-layer sieve plate, in double-deck sieve plate, the diameter of sieve aperture is 5 ~ 15mm, hole heart distance between two sieve apertures of arbitrary neighborhood is 50-60mm, the pillar stiffener for supporting double-layer sieve plate is provided with between at the bottom of double-deck sieve plate and still, the center of double-deck sieve plate be provided with one with the discharge port of the cylindrical shape of ft connection, described discharge port is connected with bleeder valve by ring flange, the bottom of reactor is provided with an acid solution pipe for acid solution turnover, the outer end of acid solution pipe there is Y-tube by Flange joint, one end of Y-tube connects acid inlet tube by valve, the other end of Y-tube is connected with vacuum deacidification system by valve, the still wall of reactor is provided with the chuck for steam heating or water-cooled and the valve corresponding with chuck, the top kettle cover of reactor is provided with the condenser of a plumbous matter, the top of described condenser is provided with a pipeline, and be connected with vacuum multi-stage water tourie by pipeline, the end of vacuum multi-stage water tourie is connected with acid fog absorption tower system, and the end of acid fog absorption tower system connects induced draft fan, described kettle cover is also provided with visor, thermometer, agitator and manhole.
Compared with prior art, a kind of method of discarded quartz tail sand being carried out again processing treatment is provided in the present invention, and by it first for the preparation of production TFT-LCD base plate glass quartz sand powder, the waste gas produced in whole production process, waste water all recycle and recycle, are energy-saving and environmental protection, green process line.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of device provided by the invention;
Fig. 2 is the structural representation of reactor;
In figure: 1-reactor, 2-vacuum deacidification system, 3-vacuum multi-stage water tourie, 4-condenser, 5-acid fog absorption tower system, 6-induced draft fan, the double-deck sieve plate of 7-, 8-filter cloth, 9-discharge port, 10-bleeder valve, 11-acid solution pipe, 12-acid inlet tube, 13-chuck, 14-agitator, 15-thermometer.
Embodiment
Below in conjunction with specific embodiment, detailed specific description is done to the present invention, but protection scope of the present invention is not limited in following examples.
In following examples of the present invention, the one-piece construction of the device adopted as shown in Figure 1, at least comprises reactor 1, vacuum deacidification system 2, vacuum multi-stage water tourie 3.The structure of reactor 1 as shown in Figure 2, the liner material of described reactor is stereotype, tetrafluoroethylene or silicon nitride ceramics, in reactor, at the bottom of distance still, 100mm place is provided with the double-deck sieve plate 7 of tetrafluoroethylene material therein, in double-deck sieve plate 7, the shape of upper and lower two-layer sieve plate is identical, and be provided with one block of filter cloth 8 between upper and lower two-layer sieve plate, in double-deck sieve plate 7, the diameter of sieve aperture is 10mm, hole heart distance between two sieve apertures of arbitrary neighborhood is 50-60mm, the pillar stiffener for supporting double-layer sieve plate is provided with between at the bottom of double-deck sieve plate and still, the center of double-deck sieve plate be provided with one with the discharge port 9 of the cylindrical shape of ft connection, described discharge port 9 is connected with bleeder valve 10 by ring flange, the bottom of reactor is provided with an acid solution pipe 11 for acid solution turnover, the outer end of acid solution pipe 11 there is Y-tube by Flange joint, one end of Y-tube connects acid inlet tube 12 by valve, the other end of Y-tube is connected with vacuum deacidification system 2 by valve, the still wall of reactor is provided with the chuck 13 for steam heating or water-cooled and the valve corresponding with chuck 13, the top kettle cover of reactor is provided with the condenser 4 of a plumbous matter, the top of described condenser 4 is provided with a pipeline, and be connected with vacuum multi-stage water tourie 3 by pipeline, the end of vacuum multi-stage water tourie 3 is connected with acid fog absorption tower system 5, and the end of acid fog absorption tower system 5 connects induced draft fan 6, described kettle cover is also provided with visor, thermometer 15, agitator 14 and manhole.
After adopting device provided by the present invention, acid solution enters after in still from bottom, and under the effect of buoyancy, after material is floated by acid solution, open and stir, motor just can start under very low electric current.When running into midway and having a power failure, quartz sand is just deposited on bottom still, if adopt common reactor, and now can not starter motor, otherwise motor must burn, more make people's headache, according to common response still, material is deposited on after bottom still, must again material be risen out, again put in again, otherwise cannot normally produce, this is multiple authentication aborning.And adopt this reactor, be not afraid of the situation generation that midway repeatedly has a power failure, substantially increase production efficiency;
In addition, adopt this reactor to be convenient to remove acid solution, material discharging is convenient.If do not adopted this still, then discharging is that acid solution enters whizzer depickling together with mortar, its Working environment is very severe, after this still, first remove acid solution, and then with clear water, material is delivered to centrifuge dewatering, then in the process of feeding, acid solution dilutes greatly, has very large change for its production environment.
Embodiment 1
The white tailings in quartz sand process produced by raw material in the present embodiment for quartz deposit that Tangshan gold Xin Shidagui industry company limited produces, concrete production technique is as follows:
1, first quartz tail sand centrifuge dehydration after clear water rinsing, impurity is wherein detected: Al
2o
3: 0.16%, Fe
2o
3: 0.053%, K
2o:0.02%, Na
2o:0.01%; Moisture: 5.6%
2, surface cleaning and removal of impurities
Quartz tail sand in step 1 is put in reactor, first open acid fog absorption tower system, whole reactive system is made to present micro-vacuum state, after the chuck water coolant opening still again and condenser cooling water, open sour pump again, in still, the amount of hydrofluoric acid is sent into by Frequency Converter Control, the concentration of hydrofluoric acid is 10% (specifically depending on the circumstances), when the quartz tail sand in still present to be flooded by acid solution and sand particle in the state stirred up and down time, open the stirring on still, during normal operation to be mixed, stop sending acid solution.And at this stirring reaction 3h, sampling analysis aluminium sesquioxide content, Al
2o
3: 0.06%.Remove acid solution recovery, material is extremely neutral with clear water washing, send in step 3 after dehydration.
3, pickling deironing
According to the analytical results of step 2, the Al of this material
2o
3content conform to quality requirements, remaining main task is except irony.Material after dehydration is sent in reactor, the acid solution of being undertaken mixing by the volume ratio of 1:1 with 20% hydrochloric acid+10% nitric acid is pumped into in reactor with acid, when the quartz tail sand in still present to be flooded by acid solution and sand particle in the state stirred up and down time, open the stirring on still, during normal operation to be mixed, stop sending acid solution, and after this stirring reaction 3h, sampling analysis: Fe
2o
3: 0.0058%, K
2o:0.008%, Na
2o:0.005%.With vacuum removal acid solution recovery; Again material use water is sent into the washing step in step 4.
4, the clear water of the material in step 3 is washed to pH=6-7, first removes moisture with whizzer, then use wet classification, collect 120 order-160 orders, 160 order-300 object sand powder respectively; Respectively after dehydration; After being less than 10ppm with deionized water wash to chlorion or nitrate ion respectively again, dewatering respectively and dry; Namely 160 order-300 object sand powder are the special sand powder of TFT-LCD base plate glass, Fe after tested
2o
3: 0.0070%, K
2o:0.008%, Na
2o:0.005%; 120 order-160 orders are glass sand powder.
Embodiment 2
The silicilyte that raw material in the present embodiment produces for Yishui, Linyi silica sand company limited produces the yellow tailings in quartz sand process, and concrete production technique is as follows:
1, because this tailings is the long-term tailings stacked, therefore first using centrifuge dehydration after clear water rinsing after quartz tail sand making beating again, impurity is wherein detected: Al
2o
3: 0.94%, Fe
2o
3: 0.15%, K
2o:0.02%, Na
2o:0.36%; Moisture: 6.3%
2, surface cleaning and removal of impurities
Quartz tail sand in step 1 is put in reactor, first open acid fog absorption tower system, whole reactive system is made to present micro-vacuum state, after the chuck water coolant opening still again and condenser cooling water, open sour pump again, in still, the amount of hydrofluoric acid is sent into by Frequency Converter Control, the concentration of hydrofluoric acid is 20% (specifically depending on the circumstances), when the quartz tail sand in still present to be flooded by acid solution and sand particle in the state stirred up and down time, open the stirring on still, during normal operation to be mixed, stop sending acid solution.And at this stirring reaction 6h, sampling analysis aluminium sesquioxide content, Al
2o
3: 0.07%.Remove acid solution recovery, material is extremely neutral with clear water washing, send in step 3 after dehydration.
3, pickling deironing
According to the analytical results of step 2, the Al of this material
2o
3content conform to quality requirements, remaining main task is except irony.Material after dehydration is sent in reactor, the acid solution of being undertaken mixing by the volume ratio of 1:1 with 10% silicofluoric acid+10% nitric acid is pumped into in reactor with acid, when the quartz tail sand in still present to be flooded by acid solution and sand particle in the state stirred up and down time, open the stirring on still, during normal operation to be mixed, stop sending acid solution, and after this stirring reaction 3h, sampling analysis: Fe
2o
3: 0.008%, K
2o:0.009%, Na
2o:0.002%.With vacuum removal acid solution recovery; Again material use water is sent into the washing step in step 4.
4, the clear water of the material in step 3 is washed to pH=6-7, first removes moisture with whizzer, then use wet classification, collect 120 order-160 orders, 160 order-300 object sand powder respectively; Respectively after dehydration; After being less than 10ppm with deionized water wash to chlorion or nitrate ion respectively again, dewatering respectively and dry; Namely 160 order-300 object sand powder are the special sand powder of TFT-LCD base plate glass, Fe after tested
2o
3: 0.0093%, K
2o:0.012%, Na
2o:0.005%; 120 order-160 orders are glass sand powder.
Embodiment 3
The silicilyte that raw material in the present embodiment produces for Area, Fengyang County, Anhui silica sand Science and Technology Ltd. produces the shallow white tailings in quartz sand process, and concrete production technique is as follows:
1, because this sand powder is dry sand powder, therefore direct-detection impurity wherein: Al
2o
3: 2.44%, Fe
2o
3: 0.058%, K
2o:0.13%, Na
2o:0.01%; Moisture: 4.3%.
2, surface cleaning and removal of impurities
Quartz tail sand in step 1 is put in reactor, first open acid fog absorption tower system, whole reactive system is made to present micro-vacuum state, after the chuck water coolant opening still again and condenser cooling water, open sour pump again, in still, the amount of silicofluoric acid is sent into by Frequency Converter Control, the concentration of silicofluoric acid is 30% (specifically depending on the circumstances), when the quartz tail sand in still present to be flooded by acid solution and sand particle in the state stirred up and down time, open the stirring on still, during normal operation to be mixed, stop sending acid solution.And at this stirring reaction 5h, after pickling, acid solution removed and reclaim, then flotation is carried out to the quartz tail sand after pickling, after flotation, quartz tail sand washing is extremely neutral, for subsequent use after centrifuge dehydration; Method for floating is specific as follows: with hydrofluoric acid and alkali lye for adjusting agent, take amino dodecane as trapping agent, with No. 2 oil for pore forming material, float downward select dirt in the condition of pH=2.0-3.0.Sampling analysis aluminium sesquioxide content after flotation, Al
2o
3: 0.046%.
3, pickling deironing
According to the analytical results of step 2, the Al of this material
2o
3content conform to quality requirements, remaining main task is except irony.Material after dehydration is sent in reactor, the acid solution of being undertaken mixing by the volume ratio of 1:1 with 10% silicofluoric acid+30% hydrochloric acid is pumped into in reactor with acid, when the quartz tail sand in still present to be flooded by acid solution and sand particle in the state stirred up and down time, open the stirring on still, during normal operation to be mixed, stop sending acid solution, and after this stirring reaction 3h, sampling analysis: Fe
2o
3: 0.005%, K
2o:0.01%, Na
2o:0.002%.With vacuum removal acid solution recovery; Again material use water is sent into the washing step in step 4.
4, material in step 3 clear water is washed to pH=6-7, first remove moisture with whizzer, again with deionized water or electronic grade ultrapure water washing to chlorion, nitrate ion and fluorion in quartz sand powder total content < 0.001% and after dehydrating, and then sieve, namely 160-300 object sand powder is the special quartz sand powder of high-quality TFT-LCD; Namely 120-160 order sand powder Counter-impact flow pulverizer is crushed to 160 order-300 object powders is the special quartz sand powder of high-quality TFT-LCD.
Embodiment 4
The shallow white tailings in quartz sand process produced by the deposition quartzose sandstone that raw material in the present embodiment produces for Heyuan quartz sand company limited, and concrete production technique is as follows:
1, because this sand powder is dry sand powder, therefore direct-detection impurity wherein: Al
2o
3: 3.5%, Fe
2o
3: 0.78%, K
2o:1.3%, Na
2o:0.21%; Moisture: 4.3%.
2, surface cleaning and removal of impurities
Quartz tail sand in step 1 is put in reactor, first open acid fog absorption tower system, whole reactive system is made to present micro-vacuum state, after the chuck water coolant opening still again and condenser cooling water, open sour pump again, in still, the amount of silicofluoric acid is sent into by Frequency Converter Control, the concentration of silicofluoric acid is 30% (specifically depending on the circumstances), when the quartz tail sand in still present to be flooded by acid solution and sand particle in the state stirred up and down time, open the stirring on still, during normal operation to be mixed, stop sending acid solution.And at this stirring reaction 5h, after pickling, acid solution removed and reclaim, then flotation is carried out to the quartz tail sand after pickling, after flotation, quartz tail sand washing is extremely neutral, for subsequent use after centrifuge dehydration; Method for floating is specific as follows: with hydrofluoric acid and alkali lye for adjusting agent, take amino dodecane as trapping agent, with No. 2 oil for pore forming material, float downward select dirt in the condition of pH=2.0-3.0.Sampling analysis aluminium sesquioxide content after flotation, Al
2o
3: 0.083%.
3, pickling deironing
According to the analytical results of step 2, the Al of this material
2o
3content conform to quality requirements, remaining main task is except irony.Material after dehydration is sent in reactor, the acid solution of being undertaken mixing by the volume ratio of 1:1 with 20% silicofluoric acid+30% hydrochloric acid is pumped into in reactor with acid, when the quartz tail sand in still present to be flooded by acid solution and sand particle in the state stirred up and down time, open the stirring on still, during normal operation to be mixed, stop sending acid solution, and after this stirring reaction 3h, sampling analysis: Fe
2o
3: 0.008%, K
2o:0.013%, Na
2o:0.006%.With vacuum removal acid solution recovery; Again material use water is sent into the washing step in step 4.
4, material in step 3 clear water is washed to pH=6-7, first remove moisture with whizzer, again with deionized water or electronic grade ultrapure water washing to chlorion, nitrate ion and fluorion in quartz sand powder total content < 0.001% and after dehydrating, and then sieve, namely 160-300 object sand powder is the special quartz sand powder of high-quality TFT-LCD; Namely 120-160 order sand powder Counter-impact flow pulverizer is crushed to 160 order-300 object powders is the special quartz sand powder of high-quality TFT-LCD.
Claims (6)
1. utilize quartz tail sand to produce a technique for TFT-LCD base plate glass quartz sand powder, it is characterized in that comprising the following steps: the content of the impurity in (1), test quartz tail sand, impurity comprises Al
2o
3, Fe
2o
3, K
2o and Na
2o, judges Al in quartz tail sand
2o
3content whether be greater than 2%;
(2), for Al
2o
3the quartz tail sand of content>=2%, quartz tail sand is put into reactor, hydrofluoric acid or silicofluoric acid is added in reactor, open to stir and pickling is carried out to quartz tail sand, after pickling, acid solution removed and reclaim, again flotation is carried out to the quartz tail sand after pickling, after flotation, quartz tail sand washing is extremely neutral, for subsequent use after centrifuge dehydration;
For Al
2o
3the quartz tail sand of content < 2%, quartz tail sand is put into reactor, in reactor, adds hydrofluoric acid or silicofluoric acid, open stirring and carry out pickling, be stirred to the Al in quartz tail sand
2o
3content < 0.1%, then acid solution removed and reclaim; By the quartz tail sand washing after pickling to neutral, for subsequent use after centrifuge dehydration;
(3), the material after process in step (2) is put into reactor, the mix acid liquor of in hydrochloric acid, nitric acid and silicofluoric acid any two kinds is adopted to carry out pickling, pickling 3 ~ 6 hours under the condition of 70-90 degree, with molten except the irony in material, finally material is cooled to room temperature, removes acid solution and reclaim;
(4), by removing the quartz tail sand after irony in upper step be washed with water to neutral rear dehydration, the 160-300 object quartz sand powder first isolated wherein dehydrates to the total content < 0.001% of chlorion, nitrate ion and fluorion in quartz sand powder with deionized water or electronic grade ultrapure water washing again; Or first with deionized water or electronic grade ultrapure water washing to the total content < 0.001% of chlorion, nitrate ion and fluorion in quartz sand powder and the 160-300 object quartz sand powder isolated again after dehydrating wherein, TFT-LCD base plate glass quartz sand powder can be obtained.
2. the technique utilizing quartz tail sand to produce TFT-LCD base plate glass quartz sand powder according to claim 1, it is characterized in that: step (1) if in the quartz tail sand of the new output of quartz tail sand, be 5-8% with clear water rinsing and by centrifuge dewatering to wherein moisture content, and then measure the content of impurity; If the long-term quartz tail sand stacked, then first pull an oar, then with clear water rinsing and with centrifuge dewatering extremely wherein moisture content be 5-8%, and then measure the content of impurity; If the quartz tail sand that moisture content is less than 5%, then directly measure the content of impurity.
3. the technique utilizing quartz tail sand to produce TFT-LCD base plate glass quartz sand powder according to claim 1, it is characterized in that: the method for floating in step (2) is specific as follows: with hydrofluoric acid and alkali lye for adjusting agent, take amino dodecane as trapping agent, with No. 2 oil for pore forming material, float downward in the condition of pH=2.0-3.0 and select dirt.
4. the technique utilizing quartz tail sand to produce TFT-LCD base plate glass quartz sand powder according to claim 1, is characterized in that: the nitric acid that the mix acid liquor in step (3) is specially hydrochloric acid that concentration is 20-33%, concentration is 10-30% and concentration be in the silicofluoric acid of 10-30% any two kinds according to the mixed acid solution of the volume ratio of 1:1.
5. the technique utilizing quartz tail sand to produce TFT-LCD base plate glass quartz sand powder according to claim 1, it is characterized in that: in step (4), after isolating 160-300 object quartz sand powder, remaining quartz sand powder sieves again, collect 120 ~ 160 object sand powder, directly carry out selling or adopt Counter-impact flow pulverizer to be crushed to 160 ~ 300 orders, as TFT-LCD base plate glass quartz sand powder.
6. one kind for the device in technique described in claim 1, it is characterized in that: at least comprise reactor, vacuum deacidification system, vacuum multi-stage water tourie, the liner material of described reactor is stereotype, tetrafluoroethylene or silicon nitride ceramics, in reactor, at the bottom of distance still, 50 ~ 150mm place is provided with the double-deck sieve plate identical with inner liner of reaction kettle material therein, in double-deck sieve plate, the shape of upper and lower two-layer sieve plate is identical, and be provided with one block of filter cloth between upper and lower two-layer sieve plate, in double-deck sieve plate, the diameter of sieve aperture is 5 ~ 15mm, hole heart distance between two sieve apertures of arbitrary neighborhood is 50-60mm, the pillar stiffener for supporting double-layer sieve plate is provided with between at the bottom of double-deck sieve plate and still, the center of double-deck sieve plate be provided with one with the discharge port of the cylindrical shape of ft connection, described discharge port is connected with bleeder valve by ring flange, the bottom of reactor is provided with an acid solution pipe for acid solution turnover, the outer end of acid solution pipe there is Y-tube by Flange joint, one end of Y-tube connects acid inlet tube by valve, the other end of Y-tube is connected with vacuum deacidification system by valve, the still wall of reactor is provided with the chuck for steam heating or water-cooled and the valve corresponding with chuck, the top kettle cover of reactor is provided with the condenser of a plumbous matter, the top of described condenser is provided with a pipeline, and be connected with vacuum multi-stage water tourie by pipeline, the end of vacuum multi-stage water tourie is connected with acid fog absorption tower system, and the end of acid fog absorption tower system connects induced draft fan, described kettle cover is also provided with visor, thermometer, agitator and manhole.
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|---|---|---|---|
| CN201510407880.9A CN104986774B (en) | 2015-07-13 | 2015-07-13 | Process for producing quartz sand powder for TFT-LCD (thin film transistor-liquid crystal display) base plate glass by utilizing quartz tail sand |
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|---|---|---|---|
| CN201510407880.9A CN104986774B (en) | 2015-07-13 | 2015-07-13 | Process for producing quartz sand powder for TFT-LCD (thin film transistor-liquid crystal display) base plate glass by utilizing quartz tail sand |
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| CN104986774A true CN104986774A (en) | 2015-10-21 |
| CN104986774B CN104986774B (en) | 2017-02-22 |
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| CN201510407880.9A Active CN104986774B (en) | 2015-07-13 | 2015-07-13 | Process for producing quartz sand powder for TFT-LCD (thin film transistor-liquid crystal display) base plate glass by utilizing quartz tail sand |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107162008A (en) * | 2017-06-20 | 2017-09-15 | 合肥市惠科精密模具有限公司 | A kind of preparation technology of TFT LCD substrates glass quartz sand powder |
| CN117843343A (en) * | 2023-12-26 | 2024-04-09 | 伟业陶瓷有限公司 | Recycling and reprocessing technology for waste materials generated in ceramic industry |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107162008A (en) * | 2017-06-20 | 2017-09-15 | 合肥市惠科精密模具有限公司 | A kind of preparation technology of TFT LCD substrates glass quartz sand powder |
| CN117843343A (en) * | 2023-12-26 | 2024-04-09 | 伟业陶瓷有限公司 | Recycling and reprocessing technology for waste materials generated in ceramic industry |
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| CN104986774B (en) | 2017-02-22 |
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