RU36267U1 - Installation for grinding and sorting materials of increased hardness, for example, metallic chromium - Google Patents

Description

200315

IPC V02 C 23/00 V02 C 23 / 08-23 / 16

Installation for grinding and sorting materials of increased hardness, for example, metallic chromium.

The utility model relates to the field of mechanical processing of materials of increased hardness, for example, such as metallic chromium, by crushing, grinding and further sorting of the crushed material into fractions.

The utility model can be used in the mining, metallurgical, chemical and construction industries.

The level of grinding materials and their fractional characteristics after sorting often determine the properties and value of finished products from recycled materials by increasing the reactivity of raw materials, the rate of subsequent technological processes, and increasing the productivity of technological equipment.

In this regard, modern industrial technologies require the creation of high-performance, cost-effective, reliable and durable grinding and sorting units capable of working in stressful conditions. This is especially important in the mechanical processing of materials with increased hardness (9 units on the Mohs scale), for example, metallic chromium, which is currently very widely used as an alloying component in the production of heat-resistant alloys, complex alloyed steels, cast irons, welding electrodes, and welding wire in the manufacture of powder metallurgy products. The listed materials and products are necessary for the most critical sectors of the national economy - energy, aircraft manufacturing, mechanical engineering, nuclear energy and space technology.

Increased requirements for the quality of finished products and products determine the production of increasingly finely divided materials with a wide range of fractions while achieving uniformity of particles in each fraction. W Bee these requirements necessitate the further development of chopping and sorting devices. When the authors conducted a utility model according to the present zshshka of patent research to identify analogues of the utility model from the world-class technology, but the IPC classes В02 С 23/00, В 02 С 23 / 08-23 / 16, solutions were found that are characterized by sets of features partially similar to existing features of the claimed utility model. The following technical solutions were selected and analyzed as analogues: Installation for the production of crushed stone and sand, ed. testimonial. USSR No. 1726033, 08.08.89. The installation of grinding and fractionation of powders of bulk materials of increased hardness. D.D. Vargasov, B.M. Prokhorov, V.M. Shevchenko. Proceedings of the SverdNIIkhimmash. Series: Equipment for equipping radiochemical processes. Issue 1 (65). Yekaterinburg, 1994. UDC 621.762.002.5. Shredded materials with particles of a certain size. UK application No. 1267655, CL B02 C 17/00, B02 C 17/20, 04/05/1968, publ. 03/22/1972 The method of grinding material, for example, cement clinker, the application of Germany No. 3815217, class. B02 C 23/00, 23/38, 19/12, 04.05.88, publ. 11.16.89 No. 46 Method and installation for grinding material, mainly cement clinker, German patent No. 4224704, class. B02 C 23/12, B07 B 9/02, 07.25.92, publ. 01/27/94. Method and device for grinding piece material, application EPO No. 0426651, 10.30.89, publ. 05/08/91 No. 19. The known device, selected as an analogue, according to EPO application No. 0426651 contains a ventilated horizontal impact-reflective crusher at the preliminary grinding stage, equipped with a pneumatic separator or screen, a ventilated tubular ball mill at the additional grinding stage. The discharge pipe of the shock mill is in communication with the pipe for introducing shredded pneumatic separator material or with an oversize screen space. The outlet pipe of the coarse-grained fraction of the psevmo separator or the entire screen space is communicated with the loading pipe of the tubular ball mill, and the pipe of the output of the fine-grained fraction of the pneumatic separator or over-screen space of the screen is communicated with the loading pipe of the shock-reflecting mill. The device is equipped with cyclones for cleaning the dusty air mixture discharged from the pneumatic separator or screen, fans and pipelines. The advantage of this device is that both mills operate in ventilation mode and in a closed cycle with an air separator. The use in a known device for grinding the starting products for cement production of a shock-transfer mill in the first grinding stage is justified, since these products are brittle material. It is known that shock mills were most widely used for grinding soft and medium hard rocks (see E.A. Dolganov. Grinding materials in the silicate industry. Edition of S.I. Kirov UPI, 1981, Sverdlovsk, p. 14 UDC 621.926: 622.73) However, this circumstance makes it impossible to use the device according to EPO application No. 0426651 for grinding materials of increased hardness, for example, as metallic chromium, whose hardness is almost 3 times higher than the hardness of cement materials (see I. R. Kleis, XX Uueemys. Wear resistance of elem of shredders for impact shock machines, Mashinostroenie Publishing House, Moscow, 1986, p. 5). Closest to the claimed one is the solution described in the article: D. D. Vargasov, B. M. Prokhorov, V. M. Shevchenko Installation of grinding and fractionation of powders of bulk materials of increased hardness. Proceedings of the SverdNIIkhimmash. Series: Equipment for equipping radiochemical processes. Issue 1 (65). Yekaterinburg, 1994, p. 9-14, adopted as a prototype. The installation comprises a feed hopper, a ventilated ball mill, equipped with a gravity-centrifugal separator equipped with a cyclone, fans and pipelines, while the feed hopper is co-rated with a loading tube of a ball mill, the discharge pipe of which is connected to

a nozzle for introducing crushed material of the gravity-centrifugal separator, and its nozzle for withdrawing a coarse fraction is in communication with the loading nozzle of the ball mill, and the nozzle for removing the dust-air mixture of the gravitational-centrifugal separator is communicated with the cyclone cavity. The installation is equipped with a bag filter for cleaning the air leaving the cyclone, while the cyclone and bag filter have, respectively, a transport container of the finished product and a container of dust fraction.

The advantage of this installation is that it, when receiving powders of metallic chromium 0.3 mm, ensures selective grinding, reduction of dust formation, improving the quality of the obtained powders. All this is achieved thanks to the organization of the process associated with intensive ventilation of the working volume of the mill and a closed cycle of grinding and separation of the material.

However, the described installation is not able to effectively provide finer selective grinding (for example, to particles smaller than 0.1 mm) for the following reasons:

1. As is known (see E. A. Dolganov, p. 53 “lib, by mixing the size of the crushed particles, their relative strength increases, and therefore, in a weakly energized ball mill, where the destruction of the material occurs only due to the mass of grinding balls, the grinding efficiency decreases sharply.

2. It is also known that with a decrease in the size of the crushed particles, in grinding plants operating in a closed cycle with classifiers (see the Guide to ore dressing. T. L Preparatory processes. M. "Nedra, 1974, p. 374), there is an increase circulating load.

At the same time (see E. A. Dolpanov p. 46) “the largest increase in mill productivity is observed at small values

circulating load.

The inability of the described plant to efficiently provide finer selective grinding is confirmed by the fact that this plant has only one grinding stage, while the trend in the art is multi-stage grinding and sorting of materials, ensuring a wide range of fractions in

| quality of the finished product. In addition, it should be noted such a drawback as the contamination of the finished product with metal particles (the so-called hardware iron, from which the equipment of the installation is made, due to the significant youth of the working surfaces with increased circulating load (ballast), especially when processing materials of increased hardness like metal chromium. This circumstance reduces the quality of the product obtained. These shortcomings are deprived of the claimed installation for grinding and sorting materials of high hardness, the operation of which the desired result will be achieved - obtaining a wide range of fractions as a finished product while reducing energy costs and increasing plant productivity, as well as reducing contamination of the finished product with hardware, The utility model of this application, like the prototype, contains a feed hopper, ventilated ball mill equipped with a centrifugal air-passage pneumatic classifier equipped with a cyclone, fans and pipelines, while the source hopper The series is in communication with the loading nozzle of a ball mill, the discharge nozzle of which is communicated with the nozzle for introducing shredded material of a centrifugal air-passage pneumatic classifier, and its outlet pipe for coarse fraction is communicated with the loading nozzle for a ball mill, and the branch pipe for discharging the dust-air mixture of a centrifugal pneumatic air-communicating air passage cyclone. The inventive installation differs from the prototype in that it is equipped with a ventilated vibratory mill equipped with a chimney-vortex pneumatic classifier, equipped with a cyclone, the cavity of which is in communication with a branch pipe for extracting the dust-air mixture of the chimney-vortex pneumatic classifier, each of the cyclones is connected by a crushed material with a magnetic separator, and a sieve classifier is installed with a magnetic separator of a centrifugal air-passage pneumatic classifier, the vibratory mill loading port is in communication with a branch pipe for the removal of a fine fraction of a centrifugal air-passage pneumatic classifier and a sieve space of a sieve classifier of a torus, and the discharge pipe of a vibratory mill is communicated with a pipe for introducing crushed material of a swirl-vortex pneumatic separator. The utility model meets all criteria of ability. It is new, because the prior art does not know the solution with the same sets of existing features, as evidenced by the analysis of analogues of the utility model described earlier in the present description. The utility model is industrially applicable, since it can be used in industry in those industries that are indicated at the beginning of the description. All the essential features included in the totality are feasible and reproducible and are used in full to achieve the expected technical result. The following description of the specific implementation of the installation and the realization in it of the process of grinding and sorting the material is a confirmation of this. In the presented drawing - the inventive installation in General. The installation contains a hopper 1 of the source material, a ball mill 2 equipped with a gravity-centrifugal pneumatic classifier 3 equipped with a cyclone 4, while the hopper 1 is connected by a pipe 5 with a loading pipe 6 of a ball mill 2, the discharge pipe 7 of which is connected by a pipe 8 with an input pipe 9 material of a gravity-centrifugal pneumatic classifier 3 crushed in a ball mill 2, and its coarse fraction outlet pipe 10 is in communication with the loading branch pipe 6 of the ball mill 2 by the pipe 11, and the pipe 12 yes of dust-inlet mixture graffts: in the case of centrifugal pneumatic classifier 3, connected to the cyclone cavity 4 by a pipe 13. The installation is equipped with a ventilated high-energy torsion vibratory mill 14, equipped with a swirl-vortex pneumatic classifier 15, equipped with a cyclone 16, the cavity of which is communicated by a pipe 17 from the dust outlet 18 with a dust outlet 18 vortex pneumatic classifier 15. Each cyclone 4 and 16 is connected along the ground material, respectively, with a magnetic separator 19 and 20, and between cyclone 4 and the magnetic separator Oromo 19, which according to the technology and layout are

gravity-centrifugal non-classifier 3, a sieve classifier 21 is installed. The loading nozzle 22 of the vibration mill 14 is connected by a pipe 23 with a branch pipe 24 of the fine fraction outlet 3, by pipelines 25 and 23 with a sieve space of the screen sieve classifier 21 and a pipe 27 from the path a vortex pneumatic classifier 15, and the discharge pipe 28 of the vibratory cartridges 14 is connected by a pipe 29 with a pipe 30 for introducing the crushed material of the flue-vortex pneumatic classifier 15.

The unit is equipped with the fans 31 and 32 necessary for its operation. The fan 31 is placed in a closed grinding system, the ball mill 2 is a pneumatic classifier 3, and the fan 32 is placed in a closed grinding system, the vibratory mill 14 is a pneumatic classifier 15. Both systems are equipped with fans 33 and 34 bag filters 35 and 36 for cleaning dust from the systems of air from dusty particles of metallic chromium.

To collect the finished and pulverized product, as well as hardware iron, containers are provided in the installation in appropriate places. Containers 37 and 38 are installed under the magnetic separator 19, container 39 is located under the bag filter 35, containers 40 and 41 are located under the magnetic separator 20, and container 42 is located under the bag filter 36.

It should be clarified that the use of the gravitational-centrifugal pneumatic classifier in the claimed installation is due to the widest use of this type of pneumatic classifier in grinding grinding systems with ventilated drum mills (see M.D. Barsky. Fractionation of powders. Publishing House Nedra, Moscow, 1980, p. 21 , Fig. 14; V.E. Mizonov, S. G. Ushakov, Aerodynamic loiacification of powders, Chemistry Publishing House, Moscow, 1989, p. 53, Fig. 2.1). The specific design of the flue-vortex pneumatic classifier, which is equipped with a vibratory mill, is available beforehand in the book. V.E. Mizonoya and S.G. Ushakova Aerodynamic classification of powders. Chemistry Publishing House, Moscow, 1989, p. 57, fig. 2.7. However, the performance of these pneumatic classifiers is not the subject of this utility model. H H Installation works as follows. From the hopper 1, metallic chromium is loaded uniformly in a predetermined amount through the nozzle 5 into a ventilated ball mill 2. The crushed chromium is carried out by the air flow from the grinding zone of the ball mill 2 and through the nozzle 7 enters the pipe 8, from where it is introduced into the gravity-centrifugal pneumatic classifier 3 through the nozzle 9 In the lower part of the pneumatic classifier 3, called the gravel stage, a large fraction is separated from the incoming crushed chromium - particles larger than 2 mm and less than 5 mm, which through 10 is output from the side pnevmoklassifikatora 4 and directed via line 11 into the tube 6 to be loaded into the mill .sharovuyu 2 regrinding. In the upper part of the pneumatic classifier 3, its most important centrifugal stage, where due to the swirling of the material with gas by the existing blades, a fine fraction of chromium - particles smaller than 2 mm and more than 0.3 mm - is deposited on the wall of the pneumatic classifier 3 and then, rolling down it, is displayed from the pneumatic classifier 3 through the pipe 24 to the pipe 23, through which the fine fraction is transported for loading through the pipe 22 into the vibrating mill 14. The dust-gas mixture with the size of the chromium particles contained in it is less than 0.3 mm, which is ready for industrial use by the product (product No. 1), it is discharged through a pipe 12 and sent through a pipe 13 to a cyclone 4. It separates particles from air, which is sent to a bag filter 35 for cleaning from dusty particles of chromium collected in a container 39 for transportation to remelting, or at a warehouse ready for industrial use as an additive in the manufacture of dyes. The resulting finished product from cyclone 4 enters the sieve classifier 21, where through the "control sieve is sifted, and larger particles randomly captured by the air flow remain above the sieve. They are discharged through a pipe 25 from the sieve space of the sieve classifier 21 to the pipe 23 and then enter the pipe 22 for loading into the vibrating mill 14. The sifted finished product from the sieve classifier 21 is fed to a magnetic separator 19, in which oc5ш eliminates the separation of acid iron from chromium particles, after which the finished product is sent to the kopteiner 37, and hardware iron to the container 38. The small fraction of metallic chromium loaded from the pneumatic classifier 3 loaded into the ventilated vibratory mill is processed into vibration ion mill 14 with the help of special machining bodies (balls, cylinders, rods, rolls, tubes, etc.) (see Modern vibration mills and their application in non-ferrous metallurgy abroad. Overview. Issue 3. Moscow, 1987, p. .2). In the described specific example of the operation of the inventive installation, balls that were tiny bodies in the ball mill 2 of the installation can be used as these special processing bodies. Their size as a result of abrasion during grinding of metallic chromium decreases to a size of 10-15 mm (with an initial ball size of 45-60 mm). Balls of this size are ineffective for grinding in the ball mill 2 of the initial chromium, where particles up to 20 mm in size are supplied, but suitable for producing fine and ultra-thin chromium fractions in the vibrating mill 14, where particles are supplied whose size does not exceed 2.0 mm. As a result of the combined action of the balls and the vibrating chamber of the mill 14, the chrome is crushed. The crushed metal chrome is transported through the discharge pipe 28 of the vibration mill 14 through the pipe 29 and is introduced through the pipe 30 into the vortex vortex air classifier 15. The inner cone with the air vane blades 15 (called the vortex zone) in the upper part of the body of the air vane classifier 15 (not shown in the drawing) forms rotating from the external electric motor cart. In the vortex zone, the metal chromium that is crushed in the vibratory mill 14 is sorted. Its particles up to 0.1 mm in size, having a low inertia and together with the air flow passing into the gaps between the rotating 1 blade and not experiencing collisions with them, are considered small and are the finished product No. 2, crawled on the claimed installation.

A large fraction with a particle size of more than 0.1 mm, but less than 2.0 mm, having undergone a collision with the jack blades, is discarded to the wall of the housing of the pneumatic classifier 15 and, falling down the gap between the inner cone and the housing, enters the pipe 27 and then through the pipeline 26 is transported through the pipe 22 in a ventilated vibratory mill 14 for regrinding, and from there to re-sorting into pneumoclassificator 15.

The fine fraction is removed from the pneumatic classifier 15 through the pipe 18 and through the pipe 17 is sent to the cyclone 16, where the chromium particles are separated from the air, which is then sent to the bag filter 36 to clean the air from dusty particles of metal chromium collected in the container 42 for transportation, or to a warehouse for industrial use as an additive in the manufacture of dyes,

either for remelting.

The finished product No. 2 obtained in cyclone 16 enters the magnetic

a separator 20, in which the separation of metallic chromium formed during grinding in the vibration mill 14 of the hardware iron from the particles of metallic chromium is carried out, after which the finished product is sent to the container 40, and the hardware iron to the container 41.

As follows from the above description, the claimed installation, which is a successful combination of necessary and sufficient technological units and equipment to achieve high results, allows you to obtain a finely divided product with the release of several fractions of crushed metal chromium, which leads to the expansion of its scope in finished products and products when their high quality.

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Claims (1)

An installation for grinding and sorting materials of increased hardness, for example, metallic chromium, containing a feed hopper, a ventilated ball mill, equipped with a gravity-centrifugal pneumatic classifier equipped with a cyclone, fans and pipelines, while the feed hopper is in communication with a ball mill loading port, the discharge port of which is connected with the input pipe of the crushed material of the gravity-centrifugal pneumatic classifier, and its large output pipe the rods are connected with the loading nozzle of the ball mill, and the nozzle of the dust-air mixture outlet of the gravity-centrifugal pneumatic classifier is communicated with the cyclone cavity, characterized in that the installation is equipped with a ventilated vibratory mill equipped with a rotational-vortex pneumatic classifier equipped with a cyclone, the cavity of which is connected to the dust mixture from the nozzle vortex pneumatic classifier, each of the cyclones is connected by a crushed material with a magnetic separator, and between the magnetic separator a sieve classifier is installed and a gravity-centrifugal pneumatic classifier cyclone, the vibratory mill loading port is in communication with a fine fraction outlet pipe, a gravity-centrifugal pneumatic classifier overflow space and with a large fraction discharge branch pipe, a swirl-vortex discharge pipe of a large class of material pneumatic classifier.