CN113976230A

CN113976230A - Fine processing technology and equipment for zircon sand

Info

Publication number: CN113976230A
Application number: CN202111367775.9A
Authority: CN
Inventors: 刘溧; 王宇旭; 章杰
Original assignee: Jiangsu Beifu Technology Co ltd; Jiangsu Mibaful Nano Material Co ltd
Current assignee: Jiangsu Beifu Technology Co ltd; Jiangsu Mibaful Nano Material Co ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2022-01-28
Anticipated expiration: 2041-11-18
Also published as: CN113976230B

Abstract

The invention discloses a fine processing technology and equipment for zircon sand, which relate to the technical field of zircon sand processing and comprise a bottom plate, wherein a ball mill is fixed on the bottom plate through a bolt, the ball mill comprises a second ball grinding box of a first ball grinding box, a discharge hole is formed in one side of the second ball grinding box, a material receiving box is installed on one side of the first ball grinding box, the bottom of the material receiving box is communicated with a material suction pipe, the other end of the material suction pipe is provided with a pumping mechanism, and a primary processing mechanism is fixed on one side of the pumping mechanism through a bolt; according to the invention, the zircon sand is primarily ground and crushed by the roller, so that the particle size of zircon sand particles entering the ball mill is best in collision fit with steel balls in the ball mill, the power consumption of the ball mill is reduced, the working efficiency of the ball mill is improved, and meanwhile, the whole grinding effect of the zircon sand is best by matching with the filtering and screening of the upper screen, so that the quality of the whole zircon sand is prevented from being influenced by large-particle zircon sand.

Description

Fine processing technology and equipment for zircon sand

Technical Field

The invention relates to the technical field of zircon sand processing, in particular to a fine processing technology and fine processing equipment for zircon sand.

Background

The zirconium silicate is a superfine powder which is processed by natural zircon sand through processes of superfine grinding, iron removal, titanium removal and the like and is white powder in appearance, the zirconium silicate has the characteristics of higher refractive index, good chemical stability and high temperature resistance, and the zirconium silicate is widely used in the industries of buildings, sanitation and daily ceramics as an opacification whitening agent and plays a role in whitening in glaze or a blank body;

however, a dry grinding, wet grinding and dry-wet integrated grinding method is often adopted in the fine processing technology of zircon sand, the whole technological process is simpler when dry grinding is adopted, the relative grinding effect is poorer than the two methods, when wet grinding is adopted, the zircon sand grinding effect is better, but the working time of the ball mill is prolonged due to the addition of aqueous solution, the power consumption of the whole device is improved, the dry-wet integrated grinding method is adopted, the grinding effect is the best, traditionally, a billiard ball mill is adopted to realize the dry-wet integrated operation, so that workers are required to circularly carry raw materials and switch devices, and the production efficiency of the whole zircon sand is greatly reduced;

therefore, a fine processing technology and equipment for zircon sand are provided.

Disclosure of Invention

The invention aims to provide a fine processing process and fine processing equipment for zircon sand, and solve the problems of low fine processing effect of zircon sand, high overall power consumption of a device and low production efficiency of zircon sand in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a fine processing technology of zircon sand comprises the following steps:

s1: put into rough zircon sand from raw materials mouth department through outside lifting the conveyer belt, simultaneously with the apatite, burn the talcum and add together in the zircon sand raw materials as the additive, zircon sand and additive mixture enter into preliminary treatment mechanism, the preliminary grinding through the roll refines, zircon sand falls into in the material receiving box, rethread motor drives semi-circular balancing weight and will fall the zircon sand screening on the screen cloth, the feed opening department is directly fallen to partly zircon sand that sieves, carry out the secondary in entering into the ball mill through the unloading pipe and grind the processing meticulous, zircon sand that does not sieve falls in the material box in unison, treat when zircon sand in the material box reaches a bit volume, the staff puts into raw materials mouth department again with the zircon sand in the material box, begin the preliminary grinding again.

S2: because the ball mill casing divide into first ball-milling case and second ball-milling case, first ball-milling case is used for dry milling to zircon sand, the use of cooperation additive, treat to after thicker zircon sand granule reaches certain fineness, fall into the receiving box from one side of first ball-milling case, the first air exhauster of start-up inhales first casing through inhaling the material pipe with the zircon sand that is located the receiving box, zircon sand granule can't be through the mesh that keeps off the material net, fall into the second air exhauster, blow the zircon sand to the central pipeline in through the second air exhauster.

S3: wet grinding treatment is carried out on zircon sand, sodium hexametaphosphate is poured into the rotary valve from the middle part of the rotary valve while water is fed into one end of a water inlet pipe, the rotary valve is rotated into the mixing pipeline before the operation is started, so that the sodium hexametaphosphate can enter the mixing pipeline, and the rotary valve is reversed after the addition is finished, so that water flow is prevented from flowing out of the mixing tank;

the water flow flushes the sodium hexametaphosphate serving as a grinding aid and the zircon sand in the central pipeline into the second ball milling box together, the zircon sand is subjected to wet grinding treatment, the grinding aid is adsorbed on the surface of zircon sand particles, the zircon sand particles are effectively infiltrated, the surface crack expansion of the zircon sand is promoted, the purpose of rapid crushing is achieved, effective energy is saved, when the ball mill rotates for a certain time, the ground zircon sand mixed liquid is discharged from a discharge port in the second ball milling box, and the next step of drying treatment is performed on the zircon sand.

A zircon sand fine processing equipment, suitable for the zircon sand fine processing technology of claim 1, comprising a bottom plate, characterized in that: the ball mill is fixed on the bottom plate through a bolt and comprises a second ball grinding box of a first ball grinding box, a discharge hole is formed in one side of the second ball grinding box, a material receiving box is installed on one side of the first ball grinding box, a material suction pipe is communicated with the bottom of the material receiving box, a drawing and releasing mechanism is installed at the other end of the material suction pipe, and a primary treatment mechanism is fixed on one side of the drawing and releasing mechanism through a bolt;

the drawing and placing mechanism comprises a first shell, a first exhaust fan, a material blocking net and a second exhaust fan, wherein the first exhaust fan is fixed on the inner wall of the top of the first shell through a bolt, the material blocking net is fixed on one end of the first exhaust fan through a bolt, the second exhaust fan is fixed on the bottom of the material blocking net, which is located on the inner wall of one side of the first shell, through a bolt, and one end of the second exhaust fan is communicated with a material discharging pipe.

Further, the preliminary treatment mechanism comprises a second shell, a roller, a placing plate and a chute, the top of the second shell is communicated with a raw material port, the inner walls of the two sides of the second shell are symmetrically and movably connected with the roller through a bearing, the placing plate is fixed at the bottom of the roller in the second shell through bolts, the placing plate is connected with a material receiving box in a sliding manner, the two sides of the material receiving box are symmetrically fixed with a motor through bolts, the output end of the motor is fixed with a semicircular balancing weight through spot welding, the other two sides of the material receiving box are fixed with first telescopic rods through bolts, springs are arranged in the first telescopic rods, the inner walls of the two sides of the second shell are symmetrically provided with second telescopic rods, one end of each second telescopic rod penetrates through one end of the first telescopic rod and is fixed with one end of each spring through spot welding, and a screen mesh is fixed on each material receiving box through the bolts, one side of the second shell is fixedly provided with a charging box through a bolt, the top of the charging box is communicated with one side of the placing plate, the side of the charging box is communicated with a mixing pipeline, and one side of the charging box, which is positioned on the mixing pipeline, is communicated with a water inlet pipe.

Furthermore, the inner wall of the bottom of the second shell is provided with a chute, and the bottom of the second shell is communicated with one side of the chute with a small angle and provided with a feed opening.

Further, there is the unloading pipe through the bolt fastening on the feed opening, and the one end that is located the unloading pipe is linked together with the pan feeding mouth of first ball mill, the one end intercommunication of arranging the material pipe has central pipeline, and is located and installs the rotary valve on the pipeline of central pipeline, and is located and is fixed with the rubber circle through the adhesion on the inner wall of pipeline, the packing groove has been seted up on the rotary valve, one side and the rubber circle looks butt that the packing groove is located the pipeline, the inlet pipe has been seted up to the one end of second ball mill case, and the one end that is located the inlet pipe is linked together with central pipeline.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the zircon sand is primarily ground and crushed by the roller, so that the particle size of the zircon sand entering the ball mill is best in collision fit with the steel balls in the ball mill, the power consumption of the ball mill is reduced, the working efficiency of the ball mill is improved, and meanwhile, the whole grinding effect of the zircon sand is best by matching with the filtering and screening of the upper screen, and the quality of the whole zircon sand is prevented from being influenced by large-particle zircon sand.

2. According to the invention, the grinding aid sodium hexametaphosphate is added when the zircon sand is ground by the ball mill, and the grinding aid is adsorbed on the surfaces of zircon sand particles to effectively infiltrate the zircon sand particles, so that the crack expansion on the surfaces of the zircon sand is promoted, the purpose of rapid crushing is achieved, the overall power consumption of the ball mill is reduced, and the capacity of the overall ball mill is improved.

3. According to the invention, through the dry-wet integrated design of the ball mill, the zircon sand can be wet-milled while being dry-milled, so that two or more ball mills are prevented from working together, the expenditure of an enterprise on the device is increased, and meanwhile, a plurality of workers are adopted to circularly carry raw materials and control the grinding device to be turned on or off, so that the capacity of the whole device is reduced.

4. According to the invention, through the connection design of the rotary valve and the mixing pipeline, workers can conveniently put additives and grinding aids into the ball mill, and the feeding and discharging of the whole device are in a closed environment, so that the phenomenon of raising during feeding of powdery zircon sand or other powdery materials is prevented, and the raw materials are wasted while the environment is polluted.

Drawings

FIG. 1 is a schematic view of the overall structure of a zircon sand refining apparatus according to the present invention.

FIG. 2 is a schematic cross-sectional front view of the preliminary treatment mechanism of the present invention.

Fig. 3 is an enlarged schematic view of the structure at B of the present invention.

Fig. 4 is a schematic top view of the screen of the present invention.

Fig. 5 is a schematic front sectional view of the pumping mechanism of the present invention.

Fig. 6 is an enlarged view of the structure at the position a of the present invention.

FIG. 7 is a schematic sectional front view of the mixing pipe of the present invention connected to a rotary valve.

In the figure: 1. a base plate; 2. a first ball mill box; 3. a second ball mill box; 4. a discharge port; 5. a material receiving box; 6. a material suction pipe; 7. a pumping mechanism; 701. a first housing; 702. a first exhaust fan; 703. a material blocking net; 704. a second exhaust fan; 8. a discharge pipe; 9. a preliminary treatment mechanism; 901. a second housing; 902. a raw material port; 903. rolling; 904. placing the plate; 905. a material receiving box; 906. screening a screen; 907. a chute; 908. a feeding port; 909. a charging box; 910. a motor; 911. a semicircular balancing weight; 912. a first telescopic rod; 913. a spring; 914. a second telescopic rod; 10. a discharging pipe; 11. a central conduit; 12. a water inlet pipe; 13. a mixing duct; 14. rotating the valve; 15. a packing groove; 16. a rubber ring; 17. and (4) feeding a pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides a technical solution:

example 1:

as shown in fig. 1-4, in the fine processing technique and equipment for zircon sand, the zircon sand in the initial state is ground, crushed and sieved, during the specific operation, the zircon sand with particles is conveyed to the raw material port 902 of the primary processing mechanism 9 on the bottom plate 1 by an external conveying device, meanwhile, the raw material zircon sand is added with additive apatite and calcined talc, the two additives are suitable for industrial ceramics, building ceramics, daily ceramics, ceramic glaze and the like, and the ceramics or ceramic tiles have the advantages of high temperature non-discoloration, enhanced whiteness after calcination, uniform density, good gloss and smooth surface, the additive and the zircon sand are mixed together, and after being ground and crushed by the roller 903 in the second shell 901, the formed small-particle zircon sand falls into the material receiving box 905 on the fan of the placing plate 904, the material receiving box 905 is provided with the screen 906, and the screen 906 is installed at a certain angle, when zircon sand particles fall onto the screen 906, due to the influence of gravity of zircon sand, in the falling process, part of zircon sand directly falls onto the chute 907 from the bottom of the material receiving box 905, while other zircon sand with larger particles cannot be sieved and falls into the material receiving box 909 from the material receiving box 905, workers pay attention to the amount of large-particle zircon sand in the material receiving box 909, and when the zircon sand in the material receiving box 909 reaches a certain amount, the large-particle zircon sand is put into the roller 903 again for grinding;

the motors 910 positioned at the two sides of the material receiving box 5 rotate, and due to the semicircular balancing weights 911 arranged at the front ends of the motors 910, when the motors 910 start to rotate, the material receiving box 905 generates vibration, and meanwhile, the first telescopic rod 912 on the material receiving box 905 moves left and right, and meanwhile, the spring 913 positioned in the first telescopic rod 912 continuously extrudes the second telescopic rod 914 on the second shell 901, so that the vibration amplitude of the whole material receiving box 905 is greatly enhanced;

the zircon sand after primary grinding enters the blanking pipe 10 through the blanking port 908, and the zircon sand is conveyed to the first ball grinding box 2 on the ball mill for dry grinding through the directional movement of the blanking pipe 10, so that the particle diameter of the zircon sand after primary grinding by the ball mill reaches below 3 mu m, and the zircon sand after dry grinding is subjected to wet grinding treatment.

Example 2:

as shown in fig. 1 and fig. 5-7, when the wet grinding process of the zircon sand after dry grinding is started, in a specific operation, the first ball grinding box 2 and the second ball grinding box 3 in the ball mill are arranged separately, so that the same ball mill can perform both dry grinding and wet grinding process on the zircon sand;

after reaching a certain fineness, the dry-milled zircon sand falls into the material receiving box 5 from one side of the first ball milling box 2, zircon sand particles in the material receiving box 5 are sucked into the first shell 701 through the first exhaust fan 702 in the drawing and releasing mechanism 7, the zircon sand reaches the material blocking net 703 along the material sucking pipe 6, the zircon sand particles are pushed into the material discharging pipe 8 through the material blocking net 703 and the extraction of the second exhaust fan 704, in order to prevent the zircon sand particles from flying out of the other end of the first exhaust fan 702, the additionally-installed material blocking net 703 blocks the lifted zircon sand, the zircon sand enters the central pipeline 11 from the material discharging pipe 8, and the wet milling treatment of the zircon sand is started.

Example 3:

as shown in fig. 1 and 6, in the fine processing technology and equipment for zircon sand, the zircon sand after twice grinding is wet-ground again, so that the diameter of zircon sand particles is less than 0.5 μm, sodium hexametaphosphate is added as a grinding aid in the operation of the fine processing technology and equipment, the grinding aid is added in the ball-milling process, the grinding aid is adsorbed on the surfaces of the zircon sand particles, the zircon sand particles are effectively infiltrated, the crack expansion on the surfaces of the zircon sand is promoted, the purpose of rapid crushing is achieved, and the overall power consumption of the ball mill is reduced;

when zircon sand enters the central pipeline 11, water starts to flow in the water inlet pipe 12, before the water flows in the water inlet pipe 12, the rotary valve 14 on the mixing pipeline 13 rotates downwards, sodium hexametaphosphate is poured into holes on the rotary valve 14, the sodium hexametaphosphate enters the mixing pipeline 13 along the packing groove 15, then the rotary valve 14 rotates around, and the packing groove 15 is blocked by the rubber ring 16 on the mixing pipeline 13 at the moment, so that the water solution cannot overflow;

the grinding aid and zircon sand in the central pipeline 11 are flushed into the feeding pipe 17 by the aqueous solution, the zircon sand mixed solution enters the second ball grinding box 3 on the ball mill to be subjected to wet grinding treatment, after the zircon sand in the second ball grinding box 3 is ground for a period of time, the discharge port 4 on the second ball grinding box 3 is opened, the zircon sand mixed solution which is completely ground is discharged, and finally the solid zircon sand is extracted by the drying device;

the whole ball mill adopts dry-wet integrated grinding operation, the process comprises the steps of firstly carrying out dry grinding on zircon sand and the prepared composite grinding aid for a period of time, adding water and the grinding aid for wet grinding after the particles of the coarse material reach a certain fineness, and comparing the dry grinding with the pure wet grinding within the same ball milling time, wherein the effect of the method is the best.

The working process of the invention is as follows:

workers convey the zircon sand with particles to a raw material port 902 in a primary treatment mechanism 9 through an external conveying device, the zircon sand entering a second shell 901 is ground and crushed by a roller 903, the formed small-particle zircon sand falls into a receiving box 905 on a placing plate 904, meanwhile, a screen 906 on the receiving box 905 rotates by motors 910 on two sides of the receiving box 5, a semicircular balancing weight 911 arranged at the front end of the motor 910 swings to drive the receiving box 905 and the screen 906 to swing together, the zircon sand on the screen 906 is filtered, part of the zircon sand directly falls onto the chute 907 from the bottom of the receiving box 905, other zircon sand with larger particles cannot be sieved and falls into a charging box 909 from the receiving box 905, when the zircon sand in the charging box 909 reaches a certain amount, the large-particle zircon sand is put into the roller 903 again to be ground and repeatedly ground, the primary grinding effect of the zircon sand reaches the best;

the zircon sand after primary grinding enters a blanking pipe 10 through a blanking port 908, the zircon sand is conveyed to a first ball grinding box 2 on a ball mill through the blanking pipe 10 to be dry-ground, the zircon sand after dry-grinding falls into a material receiving box 5 from one side of the first ball grinding box 2 after reaching a certain fineness, zircon sand particles in the material receiving box 5 are sucked into a first shell 701 through a first exhaust fan 702 in a pumping mechanism 7, the zircon sand reaches a material blocking net 703 along a material suction pipe 6, the zircon sand particles are pushed into a discharge pipe 8 through the second exhaust fan 704 by blocking the material blocking net 703 and extracting through a second exhaust fan 704, when the zircon sand enters a central pipeline 11, a rotary valve 14 on the mixing pipeline 13 rotates downwards, simultaneously sodium hexametaphosphate is poured into a hole on the rotary valve 14, then the filling 14 is poured, a filling groove 15 at the moment is blocked by a rubber ring 16 on the mixing pipeline 13, water begins to flow in the water inlet pipe 12, the grinding aid and zircon sand in the central pipeline 11 are flushed into the inlet pipe 17 together, the zircon sand mixed solution enters the second ball grinding box 3 on the ball mill and begins to be subjected to wet grinding treatment, after the zircon sand mixed solution is ground for a period of time, the discharge port 4 on the second ball grinding box 3 is opened, the zircon sand mixed solution which is completely ground is discharged, and the whole fine processing technology of the zircon sand is completed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A fine processing technology of zircon sand is characterized in that: the fine processing technology of the zircon sand comprises the following steps:

s1: rough zircon sand is put into the raw material port (902) through an external lifting conveyor belt, meanwhile, apatite and burning talc are added into the zircon sand raw material as additives, a mixture of the zircon sand and the additives enters a primary treatment mechanism (9), the zircon sand is primarily ground and refined through a roller (903), the zircon sand falls into a material receiving box (905), a semicircular balancing weight (911) is driven by a motor (910) to screen the zircon sand falling onto a screen (906), a part of screened zircon sand directly falls into a discharge port (908), the zircon sand enters a ball mill through a discharge pipe (10) to be secondarily ground and refined, the zircon sand which is not screened uniformly falls into a charging box (909), and when the zircon sand in the material charging box (909) reaches a small amount, a worker puts the zircon sand in the charging box (909) into the raw material port (902) again, restarting the primary grinding;

s2: the ball mill shell is divided into a first ball milling box (2) and a second ball milling box (3), the first ball milling box (2) is used for dry milling zircon sand, an additive is used in a matching manner, after coarse zircon sand particles reach a certain fineness, the zircon sand particles fall into a material receiving box (5) from one side of the first ball milling box (2), a started first exhaust fan (702) sucks the zircon sand in the material receiving box (5) into the first shell (701) through a material sucking pipe (6), the zircon sand particles cannot fall into a second exhaust fan (704) through meshes of a material blocking net (703), and the zircon sand is blown into a central pipeline (11) through the second exhaust fan (704);

s3: wet grinding treatment is carried out on zircon sand, sodium hexametaphosphate is poured into the rotary valve (14) from the middle part of the rotary valve (14) while water is introduced into one end of the water inlet pipe (12), before the operation is started, the rotary valve (14) is rotated into the mixing pipeline (13) to enable the sodium hexametaphosphate to enter the mixing pipeline (13), and the rotary valve (14) is reversed after the addition is finished to prevent water flow from flowing out of the mixing tank;

water flow flushes sodium hexametaphosphate serving as a grinding aid and zircon sand in a central pipeline (11) into a second ball grinding box (3) together, the zircon sand is subjected to wet grinding treatment, the grinding aid is adsorbed on the surfaces of zircon sand particles, the zircon sand particles are effectively infiltrated, the surface crack expansion of the zircon sand is promoted, the purpose of rapid crushing is achieved, energy is effectively saved, when the ball mill rotates for a certain time, a ground zircon sand mixed solution is discharged from a discharge hole (4) in the second ball grinding box (3), and the next step of drying treatment is carried out on the zircon sand.

2. A zircon sand fine processing equipment, which is suitable for the zircon sand fine processing technology of claim 1, and comprises a bottom plate (1), and is characterized in that: the ball mill is fixed on the bottom plate (1) through bolts and comprises a second ball grinding box (3) of a first ball grinding box (2), a discharge hole (4) is formed in one side of the second ball grinding box (3), a material receiving box (5) is installed on one side of the first ball grinding box (2), a material sucking pipe (6) is communicated with the bottom of the material receiving box (5), a drawing and releasing mechanism (7) is installed at the other end of the material sucking pipe (6), and a primary processing mechanism (9) is fixed on one side of the drawing and releasing mechanism (7) through bolts;

draw and put mechanism (7) including first casing (701), first air exhauster (702), fender material net (703) and second air exhauster (704), the top inner wall of first casing (701) has first air exhauster (702) through the bolt fastening, and the one end that is located first air exhauster (702) has fender material net (703) through the bolt fastening, one side inner wall of first casing (701) and the bottom that is located fender material net (703) have second air exhauster (704) through the bolt fastening, the one end intercommunication of second air exhauster (704) has row material pipe (8).

3. The apparatus of claim 2, wherein the apparatus comprises: the primary treatment mechanism (9) comprises a second shell (901), a roller (903), a placing plate (904) and a chute (907), wherein the top of the second shell (901) is communicated with a raw material port (902), the inner walls of two sides of the second shell (901) are symmetrically and movably connected with the roller (903) through bearings, the placing plate (904) is fixed at the bottom of the roller (903) in the second shell (901) through bolts, a material receiving box (905) is connected onto the placing plate (904) in a sliding mode, motors (910) are symmetrically fixed on two sides of the material receiving box (905) through bolts, semicircular balancing weights (911) are fixed at the output ends of the motors (910) through spot welding, first telescopic rods (912) are fixed on the other two sides of the material receiving box (905) through bolts, springs (913) are installed inside the first telescopic rods (912), and second telescopic rods (914) are symmetrically installed on the inner walls of two sides of the second shell (901), and one end of the second telescopic rod (914) penetrates through one end of the first telescopic rod (912) and is fixed with one end of the spring (913) through spot welding, the screen (906) is fixed on the material receiving box (905) through bolts, the charging box (909) is fixed on one side of the second shell (901) through bolts, the top of the charging box (909) is communicated with one side of the placing plate (904), the side of the charging box is communicated with the mixing pipeline (13), and one side of the charging box, which is located on the mixing pipeline (13), is communicated with the water inlet pipe (12).

4. The apparatus of claim 3, wherein: a chute (907) is installed on the inner wall of the bottom of the second shell (901), and a feed opening (908) is formed in the bottom of the second shell (901) and communicated with one side, with a small angle, of the chute (907).

5. The apparatus of claim 4, wherein: there are unloading pipe (10) through the bolt fastening on feed opening (908), and the one end that is located unloading pipe (10) is linked together with the pan feeding mouth of first ball mill, the one end intercommunication of row's material pipe (8) has central pipeline (11), and is located and installs rotary valve (14) on a hybrid pipeline (13) of central pipeline (11), and is located and is fixed with rubber circle (16) through the adhesion on the inner wall of hybrid pipeline (13), packing groove (15) have been seted up on rotary valve (14), one side and rubber circle (16) looks butt that packing groove (15) are located hybrid pipeline (13), inlet pipe (17) have been seted up to the one end of second ball mill case (3), and the one end that is located inlet pipe (17) is linked together with central pipeline (11).