CN107930838B - grading treatment circulating system for producing ground calcium carbonate - Google Patents
grading treatment circulating system for producing ground calcium carbonate Download PDFInfo
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- CN107930838B CN107930838B CN201711160478.0A CN201711160478A CN107930838B CN 107930838 B CN107930838 B CN 107930838B CN 201711160478 A CN201711160478 A CN 201711160478A CN 107930838 B CN107930838 B CN 107930838B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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Abstract
The invention discloses a classification treatment circulating system for producing heavy calcium carbonate, which is sequentially provided with a raw material tank, a proportioning tank, a wet grinder, a cyclone, a finished product slurry tank, a centrifugal machine, a dryer and a finished product tank according to the raw material trend, wherein the cyclone is a hydrocyclone, the hydrocyclone also comprises an overflow port and a bottom flow port, the bottom flow port is communicated with a recovery barrel, the recovery barrel is of a cylindrical structure, the recovery barrel is provided with a coarse material outlet, the overflow hole is communicated with a shunt barrel, the shunt barrel is of a cylindrical structure, the shunt barrel is provided with a slurry outlet, the slurry outlet is communicated with the finished product slurry tank through a pipeline, and the coarse material outlet is communicated with a feed inlet pipeline of the wet grinder.
Description
Technical Field
The invention relates to the technical field of heavy calcium carbonate production equipment, in particular to a classification treatment circulating system for kinds of production of heavy calcium carbonate.
Background
The ground calcium carbonate is a calcium carbonate product obtained by a physical method, is ground by using high-purity limestone (such as calcite, chalk and the like), and the ground calcium carbonate has higher density and lower sedimentation volume than the light calcium carbonate.
The production system of the heavy calcium carbonate is divided into a dry method and a wet method, currently, dry grinding graded modification is taken as the main part in China, and the production system has the biggest defects that the production of high-number products cannot be finished due to the limitation of equipment on the particle size distribution, mainly the production of the products with low yield and unstable product quality, and the wet method production is realized by grinding calcite into powder with fixed fineness, adding fixed amount of dispersing agent into water, and carrying out wet grinding, dehydration, drying and crushing.
In the existing process of producing heavy calcium carbonate by wet grinding, grinding aids are added during grinding, because the low solid content grinding particle size is difficult to reach the standard, the high solid content grinding is difficult to dry and disperse in the later period, grinding aid slurry is not added due to the defects of the process and equipment, the slurry can not flow and agglomerate (paste grinding), but the grinding aids are the main reasons for causing a plurality of downstream products to be unusable or generate a plurality of defects, and different auxiliaries with chemical components are which are not used for sanitary products.
The Chinese patent with application number 201420815349.6 discloses heavy calcium carbonate grading devices, wherein a vertical grinder is communicated with a grader, and a fine powder grade grader and a medium fine powder grade grader are arranged in the grader to obtain products with higher quality, but the grading device is only suitable for a powder upgrading mode and cannot realize the grading of slurry.
Disclosure of Invention
The invention aims to solve the technical problem that classification treatment circulating systems for producing heavy calcium carbonate are provided, the circulating systems realize a slurry classification process, make up for the problem that wet grinding slurry cannot be classified in China, and enable the product to be narrow in particle size distribution and more uniform in product fineness.
In order to solve the technical problems, the technical scheme of the invention is as follows:
classification treatment circulating systems for producing heavy calcium carbonate, which are sequentially provided with a raw material tank, a proportioning tank, a wet grinder, a cyclone, a finished product slurry tank, a centrifuge, a dryer and a finished product tank according to the raw material trend;
the raw material tank is communicated with a batching tank through a screw conveyor, a wet grinder buffer tank is further arranged between the batching tank and a wet grinder, a discharge port of the batching tank is communicated with the wet grinder buffer tank, the wet grinder buffer tank is communicated with a feed port of the wet grinder, a cyclone feed tank is further arranged between the wet grinder and the cyclone, the discharge port of the wet grinder is communicated with the cyclone feed tank, and the cyclone feed tank is communicated with the feed port of the cyclone;
the cyclone is a hydrocyclone; the hydrocyclone also comprises an overflow port and a bottom flow port; the underflow port is communicated with a recovery barrel, the recovery barrel is of a cylindrical structure, and a coarse material outlet is formed in the recovery barrel; the overflow hole is communicated with a shunt barrel; the flow distribution barrel is of a cylindrical structure and is provided with a slurry outlet; the slurry outlet is communicated with a finished slurry tank through a pipeline, and the coarse material outlet is communicated with a feed inlet of a wet grinder.
As improvements, a modification tank and a modification dust remover are communicated between the dryer and the finished product tank, a discharge port of the dryer is communicated with a feed inlet of the modification tank, and a discharge port of the modification tank is communicated with the modification dust remover.
As improvements, cloth bag filters are respectively arranged at the feed inlets of the raw material tank and the finished product tank.
As improvements, a cyclone feeding pipe penetrating through the recovery barrel is arranged between the discharge port of the cyclone feeding tank and the feed inlet of the cyclone, a sleeve pipe is concentrically arranged around the cyclone feeding pipe, the sleeve pipe is connected with the bottom of the recovery barrel, and the inner diameter of the sleeve pipe is larger than that of the cyclone feeding pipe.
As an improvement of , the wet mill was an ultrafine wet stirred mill LXJM 3600.
As an improvement, the hydrocyclone is an SC1397 hydrocyclone.
As a modification of , the wet mill and cyclone were followed by and second vibrating screens, respectively.
As a modification of , the wet mill surge tank meters the slurry to the wet mill by a horizontal centrifugal slurry pump and a flow meter.
As a modification of , the cyclone feed tank delivers slurry to the cyclone at a fixed rate controlled by a horizontal centrifugal slurry pump and an electromagnetic flow meter.
As an improvement of , the splitter barrel is further provided with a liquid level control port which is located below the level of the slurry outlet.
As improvements, the top of the recycling bin and the top of the shunting bin are both provided with observation covers, and the observation covers are provided with transparent observation windows.
The technical effect obtained by adopting the technical scheme is as follows:
1. meanwhile, due to the realization of the sizing agent grading, the problem that the sizing agent cannot be graded by the conventional production system is solved, the problem that a downstream product cannot be used or has a plurality of defects due to the grinding aid is solved, and the quality of the product is improved.
2. This circulation system is provided with the swirler, separates the thick liquids after will grinding, separates through the swirler, carries out post processing with qualified thick liquids to isolate the coarse grain, retrieve the regrinding with the coarse grain, shortened the thick liquids and ground the time in the wet grinder, reduce the fine particle and produce, thereby reach the particle diameter and narrow down, the distribution is even. The cyclone is an SC1397 hydrocyclone, the diameter of a bottom flow port is 3.0-6.0 mm, and qualified slurry can reach the granularity D after classification50＝0.5～2.5um，D974.0-8.0 um and 25um < 12 ppm. Thereby the particle size distribution of the product is narrower and the fineness of the product is more uniform.
3. The circulating system comprises a modification tank and a modification dust remover, and can modify and treat the heavy calcium carbonate to meet different requirements of different downstream products on the heavy calcium carbonate.
4. The circulating system is characterized in that a cyclone feeding pipe penetrating through the recovery barrel is arranged between a discharge port of the cyclone feeding tank and a feed port of the cyclone, a sleeve is concentrically arranged around the cyclone feeding pipe and connected with the bottom of the recovery barrel, the sleeve is connected with the recovery barrel to play a role in sealing, and in addition, is used for separating coarse materials from the cyclone feeding pipe to prevent seepage.
5. According to the circulating system, an th vibrating screen and a second vibrating screen are respectively arranged behind the wet grinder and the cyclone, cloth bag filters are arranged at feed inlets of the raw material tank and the finished product tank, and multi-stage filtration of products is realized in the preparation process, so that the uniform particle size of the products is ensured.
Drawings
FIG. 1 is a schematic view showing the overall structure of a system for classifying treatment for producing heavy calcium carbonate according to the present invention;
FIG. 2 is a schematic view of the structure of a recycling bin and a split-flow bin of the classification treatment circulating system for producing heavy calcium carbonate according to the present invention;
in the figure, 1-raw material tank, 101-cloth bag filter, 2-proportioning tank, 3-wet grinder, 4-cyclone, 401-overflow port, 402-underflow port, 403-cyclone feed pipe, 5-finished pulp tank, 6-centrifuge, 7-dryer, 8-finished product tank, 801-cloth bag filter, 9-wet grinder buffer tank, 10-cyclone feed tank, 11-modification tank, 12-modified dust remover, 13- vibration sieve, 14-recovery tank, 1401-coarse material inlet, 1402-coarse material outlet, 1403-sleeve, 1404-transparent observation window, 15-shunt tank, 1501-pulp inlet, 1503-pulp outlet, 1503-liquid level control port, 1504-transparent observation window, and 16-second vibration sieve.
Detailed Description
For purposes of making the objects, aspects and advantages of the present invention more apparent, the present invention is further illustrated in detail below with reference to the following examples and the accompanying drawings.
As shown in fig. 1 and fig. 2, classification treatment circulation systems for producing ground calcium carbonate and classification treatment circulation systems for ground calcium carbonate are sequentially provided with a raw material tank 1, a batching tank 2, a wet grinder 3, a cyclone 4, a finished product slurry tank 5, a centrifuge 6, a dryer 7 and a finished product tank 8 according to the raw material trend.
Feed tank 1 is through screw conveyer intercommunication batching jar 2, still be provided with wet grinder buffer tank 9 between batching jar 2 and the wet grinder 3, the discharge gate intercommunication wet grinder buffer tank 9 of batching jar 2, the feed inlet of wet grinder buffer tank 9 intercommunication wet grinder 3, still be provided with swirler feed tank 10 between wet grinder 3 and the swirler 4, the discharge gate intercommunication swirler feed tank 10 of wet grinder 3, swirler feed tank 10 communicates the feed inlet of swirler 4.
The cyclone 4 is a hydrocyclone; the hydrocyclone is an SC1397 hydrocyclone. The hydrocyclone comprises an overflow 401 and an underflow 402; the underflow port 402 is communicated with a recycling bin 14, and the recycling bin 14 is of a cylindrical structure; a sleeve 1403 communicated with the underflow port 402 is arranged inside the recycling bin 14, and the inner diameter of the sleeve 1403 is smaller than the diameter of the coarse material inlet of the recycling bin 14. The overflow hole is communicated with a shunt barrel 15; the shunt barrel 15 is of a cylindrical structure, and the shunt barrel 15 is provided with a slurry outlet 1502. A cyclone feeding pipe 403 penetrating through the recycling bin is arranged between the discharge hole of the cyclone feeding tank 4 and the feed inlet of the cyclone 4; a sleeve 1403 is also concentrically arranged around the cyclone feed pipe 403, the sleeve 1403 is connected with the bottom of the recovery barrel 14, and the inner diameter of the sleeve 1403 is larger than the diameter of the cyclone feed pipe 403.
The slurry outlet 1502 is communicated with a finished slurry tank 5 through a pipeline, and the coarse material outlet 1402 is communicated with a feed inlet pipeline of the wet grinding machine 3.
As a modification, the diversion barrel 15 is further provided with a liquid level control port 1503, the liquid level control port 1503 is located below the horizontal line of a slurry outlet 1502, a modification tank 11 and a modification dust collector 12 are communicated between the dryer 7 and a finished product tank 8, a cloth bag filter 101 is arranged at the feed inlet of the raw material tank 1, a cloth bag filter 801 is arranged at the feed inlet of the finished product tank 8, -th vibrating screens 13 and 16 are respectively arranged behind the wet grinder 3 and the cyclone 4, the wet grinder buffer tank 9 quantitatively conveys slurry to the wet grinder 3 through a horizontal centrifugal slurry pump and a flowmeter, the cyclone feed tank 10 conveys the slurry to the cyclone 4 through a horizontal centrifugal slurry pump and an electromagnetic flowmeter, the tops of the recovery barrel 14 and the diversion barrel 15 are respectively provided with an observation cover, the observation cover of the recovery barrel 14 is provided with a transparent observation window 1404, and the observation cover of the diversion barrel 15 is provided with a transparent observation window 1405.
The specific production process comprises the following steps: calcite is crushed by a crusher and ground into decomposed stone coarse powder by a grinder, and stored in a raw material tank 1 for later use. Then conveying the decomposed stone coarse powder into a mixing tank 2 through a screw conveyor, adding water to prepare low-solid-content slurry, and quantitatively conveying the slurry to a wet grinding machine 3 for grinding through a horizontal centrifugal slurry pump and a flowmeter; the wet grinder 3 is an ultra-fine wet stirring mill LXJM 3600. The wet mill is fed with 2 tons of material and has a ton power of 60KW, and the grinding flow rate of the wet mill is 150L/min.
As a modification, a wet grinding machine buffer tank 9 is further arranged between the batching tank 2 and the wet grinding machine 3, the discharge port of the batching tank 2 is communicated with the wet grinding machine buffer tank 9, and the wet grinding machine buffer tank 9 is communicated with the feed port of the wet grinding machine 3. Carry the thick liquids of batching jar 2 to wet grinder buffer tank 9 through batching jar discharge pump, wet grinder buffer tank 9 is provided with the agitator, guarantees the homogeneity of thick liquids through the stirring, then carries the thick liquids to wet mill 3 through horizontal centrifugal slurry pump and flowmeter ration. The arrangement of the buffer tank 9 of the wet grinder can ensure the continuous production and the uniformity of the slurry.
The ground slurry is diluted by adding water, pressurized and passed through a cyclone 4, coarse particles separated out are discharged through a bottom flow port 402 and enter a recycling bin, the recycling bin 14 is communicated with the bottom flow port 402 through a sleeve, feeding is facilitated, then the coarse particles are recycled to a wet grinder 3 for continuous grinding, and qualified slurry enters a finished slurry tank 5 through an overflow port 401. After the slurry is separated, the indexes of the slurry are as follows: particle size D50＝0.5～2.0um，D97＝5.0～8.0um，+25um＜12ppm。
The flow dividing barrel 15 is provided with a liquid level control port 1503, and the liquid level control port 1503 controls the liquid level of the cyclone feeding tank 10 to realize continuous production of the cyclone 4. The level control port 1503 is provided with an automatic regulating valve which is controlled by the level of the cyclone feed tank 10.
As improvements, a cyclone feeding tank 10 is further arranged between the wet grinding machine 3 and the cyclone 4, a discharge port of the wet grinding machine 3 is communicated with the cyclone feeding tank 10, the cyclone feeding tank 10 is communicated with a feed port of the cyclone 4, slurry of the wet grinding machine 3 is conveyed into the cyclone feeding tank 10 through a pipeline by a discharge pump of the wet grinding machine, an agitator is arranged on the cyclone feeding tank to ensure the uniformity of the slurry, a cyclone feeding pipe 403 penetrating through the recovery tank is arranged between the discharge port of the cyclone feeding tank 4 and the feed port of the cyclone 4, a sleeve 1403 is further concentrically arranged around the cyclone feeding pipe 403, the sleeve 1403 is connected with the bottom of the recovery tank 14, the inner diameter of the sleeve 1403 is larger than that of the cyclone 403, the slurry enters the cyclone for separation through the cyclone feeding pipe 403, coarse slurry enters the recovery tank through a bottom flow port 402 after separation, qualified slurry enters a flow dividing barrel 15, the 1403 is connected with the recovery through 14 to play a sealing role, and the is used for separating the coarse slurry from the feed pipe 403 to prevent seepage.
As an improvement, the slurry of the wet grinding machine 3 firstly passes through the -th vibrating screen 13 and then enters the cyclone feeding tank 9, the slurry pipeline of the cyclone feeding tank 9 is conveyed into the cyclone 4 through the cyclone feeding pump, after the slurry is separated, the qualified slurry passes through the second vibrating screen 16 and then enters the finished slurry tank 5.
And (3) conveying the slurry in the finished product slurry tank 5 into a centrifuge 6 through a centrifuge feed pump for dehydration, setting a rotation speed ratio of the dehydrator to be 50:1, wherein the solid content of the separated slurry is 70% and the white water is 0.3%. Then, injecting the dehydrated slurry into a dryer 7 by using a slurry pump, and controlling the rotating speed to 1600RPM and the temperature to be 110 ℃; air volume 150m3And/min, obtaining a finished heavy calcium carbonate product, storing the finished heavy calcium carbonate product in a finished product tank 8, and subpackaging by a packaging machine.
As an improvement, a modification tank 11 and a modification dust remover 12 are communicated between the dryer 7 and the finished product tank 8, a discharge port of the dryer 7 is communicated with a feed inlet of the modification tank 11, and a discharge port of the modification tank 11 is communicated with the modification dust remover 12. Realizes the modification treatment of the heavy calcium carbonate and meets different requirements of different downstream products on the heavy calcium carbonate filler.
When 2um of heavy calcium carbonate prepared by the existing production equipment reaches 57%, 10um can reach 100%. When the wet grinding slurry 2um of the heavy calcium carbonate prepared by the circulating system of the invention reaches 40%, 10um can reach 100%, and the particle size is greatly narrowed. The prepared breathable film has improved air permeability, improved glossiness, greatly reduced pinhole defect and no crystal point; in addition, as the filler particle size becomes narrower, the transverse tensile strength of the breathable film increases. Meanwhile, the circulation system realizes slurry upgrading, can grind the slurry with lower solid content after grading, can avoid using grinding aids (the existing equipment can not grade the slurry, grind the slurry with high solid content, does not use the grinding aids, causes the paste grinding blockage of a wet grinder, and can not finish the grinding process), and the prepared heavy calcium carbonate does not contain any grinding aids, contains few impurities, has narrow particle size distribution, reduces influencing factors when preparing the breathable film, and avoids the film from foaming and bursting to cause film damage, thereby improving the yield of the breathable film.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (9)
1, grading treatment circulating system for producing heavy calcium carbonate, which is characterized in that a raw material tank, a batching tank, a wet grinder, a cyclone, a finished product slurry tank, a centrifuge, a dryer and a finished product tank are arranged in sequence according to the raw material trend;
the raw material tank is communicated with a batching tank through a screw conveyor, a wet grinder buffer tank is further arranged between the batching tank and a wet grinder, a discharge port of the batching tank is communicated with the wet grinder buffer tank, the wet grinder buffer tank is communicated with a feed port of the wet grinder, a cyclone feed tank is further arranged between the wet grinder and the cyclone, the discharge port of the wet grinder is communicated with the cyclone feed tank, and the cyclone feed tank is communicated with the feed port of the cyclone;
the hydrocyclone is a hydrocyclone, and the diameter of a bottom flow port is 3.0-6.0 mm; the hydrocyclone also comprises an overflow port and a bottom flow port; the underflow port is communicated with a recovery barrel, the recovery barrel is of a cylindrical structure, and a coarse material outlet is formed in the recovery barrel; the overflow port is communicated with a shunt barrel; the flow distribution barrel is of a cylindrical structure and is provided with a slurry outlet; the slurry outlet is communicated with a finished product slurry tank through a pipeline, and the coarse material outlet is communicated with a feed inlet of a wet grinder;
a cyclone feed pipe penetrating through the recovery barrel is arranged between the discharge port of the cyclone feed tank and the feed inlet of the cyclone; a sleeve is concentrically arranged around the cyclone feeding pipe and connected with the bottom of the recovery barrel, and the inner diameter of the sleeve is larger than that of the cyclone feeding pipe.
2. The classification treatment circulation system for producing heavy calcium carbonate according to claim 1, wherein a modification tank and a modification dust remover are communicated between the dryer and the finished product tank, a discharge port of the dryer is communicated with a feed port of the modification tank, and a discharge port of the modification tank is communicated with the modification dust remover.
3. The system of claim 1, wherein the feed inlets of the raw material tank and the finished product tank are respectively provided with a cloth bag filter.
4. The classification treatment recycling system for producing heavy calcium carbonate according to claim 1, wherein the wet grinder is an ultra-fine wet stirring mill LXJM 3600.
5. The staged treatment recycling system for producing ground calcium carbonate according to claim 1, wherein the hydrocyclone is an SC1397 hydrocyclone.
6. The classification treatment circulation system for producing ground calcium carbonate according to claim 1, wherein said wet grinder and cyclone are followed by th and second vibrating screens, respectively.
7. The classification treatment circulation system for producing heavy calcium carbonate according to claim 1, wherein the wet grinder surge tank quantitatively delivers the slurry to the wet grinder through a horizontal centrifugal slurry pump and a flow meter; the cyclone feeding tank controls the fixed amount of slurry to be conveyed to the cyclone through a horizontal centrifugal slurry pump and an electromagnetic flowmeter.
8. The system of claim 1, wherein the split drum is further provided with a liquid level control port, and the liquid level control port is located below the level of the slurry outlet.
9. The system of claim 1, wherein the top of the recycling bin and the top of the diversion bin are provided with observation covers, and the observation covers are provided with transparent observation windows.
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| CN109292806A (en) * | 2018-11-09 | 2019-02-01 | 长沙万荣粉体设备科技有限公司 | A kind of calcium carbonate slurry process and treat system and method |
| CN109233342A (en) * | 2018-11-09 | 2019-01-18 | 长沙万荣粉体设备科技有限公司 | A kind of calcium carbonate slurry process and treat system and method |
| CN109370259A (en) * | 2018-11-09 | 2019-02-22 | 长沙万荣粉体设备科技有限公司 | A kind of modified calcium carbonate dry powder production system and method |
| CN109266043A (en) * | 2018-11-09 | 2019-01-25 | 长沙万荣粉体设备科技有限公司 | A kind of modified heavy calcium carbonate dry powder production system |
| CN109759210B (en) * | 2018-12-12 | 2021-09-21 | 东升新材料（山东）有限公司 | Device and method for preparing wet-process ground calcium carbonate |
| CN112138835B (en) * | 2020-09-02 | 2023-09-26 | 郑州中南杰特超硬材料有限公司 | Shaping method of cubic boron nitride and application thereof |
| CN115806304A (en) * | 2021-09-13 | 2023-03-17 | 中国科学院过程工程研究所 | Method for preparing ultrafine heavy calcium carbonate by classifying marble waste residues |
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| AU3277193A (en) * | 1991-12-12 | 1993-07-19 | Paul E. Adler | Process for producing a carbonate composition |
| CN101037213A (en) * | 2007-02-13 | 2007-09-19 | 金东纸业(江苏)有限公司 | Preparation method of heavy calcium carbonate and special sharpener |
| CN101417258B (en) * | 2008-11-20 | 2011-09-07 | 胡智勇 | Wet method accurate sizing technique for preparing superfine function powder |
| CN201735441U (en) * | 2010-06-24 | 2011-02-09 | 常德市磊鑫矿业科技有限公司 | Heavy calcium carbonate wet grinding system |
| CN103521348B (en) * | 2013-09-18 | 2017-01-11 | 连州市炜铧矿产有限公司 | Calcium carbonate concentrate screening and extraction process and system thereof |
| CN104743598A (en) * | 2015-03-04 | 2015-07-01 | 江西科越科技有限公司 | Preparation method of coarse whiting special for papermaking |
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