Under the guidance of Mao master of proletarian revolutionary line, China's non-ferrous metal beneficiation plant, taking class struggle as the key link, hold high the glorious banner of "Angang Constitution", and to mobilize the masses, carrying out technological innovation, technological innovation, has made great achievements The promotion and application of these double leather achievements have great significance for improving the level of mechanized equipment in the concentrator, improving working conditions and improving labor productivity.
First, the pneumatic secondary crusher Nanjing Phoenix Mountain iron ore trial of a pneumatic secondary crusher, secondary crushing chunks of solving the problem. Hard ore crushing machine (hardness factor P f = 12 ~ 13), the largest block of up to 800 mm, the power of the compressed air, the working pressure of 5 kg / cm 2. For the crushing of large ore concentrates in small ore dressing plants, such crushing equipment can be used where compressed air supply is available. Secondary crushing on the upper grid of the original mine silo can improve the working conditions of workers and reduce heavy physical labor (see the figure below).
[next]
Instructions for use of the pneumatic secondary crusher:
1. The machine is suspended on a main beam of a ton single beam manual or electric crane. The main beam I-beam is required to be 25 or 24 workers.
2. The person is standing on the grid and manipulating the machine. When the screen hole is larger than 300 mm, it is necessary to wear a seat belt to avoid accidents.
3. When making the machine, it should be noted that the material and processing accuracy meet the design requirements.
Second, the automatic iron removal device to prevent the iron pieces mixed into the ore into the medium and fine crusher, ore dressing and crushing equipment accidents, usually in the middle and fine crushing of the belt conveyor before the iron conveyor to remove the iron in the ore.
Shandong Province Fukuyama copper ore iron made an automatic means better use. The device consists of an electromagnet, a metal detector, a signal device, and a moving member.
Working process: The equipment is installed on the feeding tape of the medium crushing crusher. Under normal circumstances, the electromagnet is not charged, has no magnetism, and stays outside the tape. When there is a metal piece on the transport tape passing through the metal detector, an indication signal is immediately issued, and the electromagnet is charged, magnetic, and pushed to the middle of the tape under the action of the moving member, sucking out the iron piece, and then automatically returning to the original position, And the power is cut off, so the electromagnet loses its magnetism, and the iron piece that is sucked out falls into the scrap iron box. Repeatedly, to achieve automatic iron removal purposes.
Third, the spiral grading machine bearing transformation original Ф500, Ф750 and Ф1000 mm spiral classifier bearing fulcrum is set in the middle, so there are two disadvantages:
1. The spiral blade is broken, which is not continuous, which causes difficulty in graded sand return and affects the classification effect.
2. The bearing seal is not good, the large shaft of the classifier is seriously worn, resulting in the phenomenon of intermediate broken shaft. Therefore, most small concentrators in Zhejiang Province and other small concentrating plants in other provinces have changed the intermediate bearing of this classifier to the end bearing according to the production practice, so that the spiral is continuous and then grading. The hollow shaft of the machine is lengthened. The newly added shaft is flanged with the original shaft and can be replaced after wear. In addition, the bearing of the classifier is originally a cast iron plain bearing, which has shortcomings of short service life, frequent replacement, and uneconomical. Workers have many reforms on their bearings, such as high-pressure water-sealed plain bearings, dry-oil-sealed ball bearings, and rubber bushing plain bearings. The production results are very good. The common and simple rubber bearings are described below. The bearing is made up of overlapping waste tapes. The stack thickness is generally 150 mm and can be clamped with iron plates. The rubber bushing has the advantages of wear resistance, simplicity, low cost and convenient replacement. Its structure is shown in the figure below. The specific size can be designed by yourself.
[next]
4. 0.3 m 3 rod type flotation machine 0.3 m 3 rod type flotation machine is a new type of flotation equipment which was transformed by the 3A flotation machine in Qixian Copper Mine of Anhui Province. Its structure is shown in the figure below. The main advantages are as follows:
1. The structure is simple, easy to operate, and the maintenance workload is reduced by about 60% compared with the 3A flotation machine;
2. Large inspiratory capacity, high stirring intensity and bubble dispersion;
3. The unit volume production capacity is increased by about 40% compared with the 3A flotation machine;
4. High selection index: used to select the copper ore of Jixian County. When the grade of the concentrate is not less than 20%, the recovery rate can be increased by 1-2%.
5. The power consumption calculated according to the unit production capacity can be reduced by about 40%.
This flotation machine is of the shallow groove type, and the main components are the rod wheel, the boss and the flow stabilizer. Through the rotation of the rod wheel, the lower part forms a negative pressure, the air is sucked through the hollow shaft, mixed with the slurry, pushed from the stirring zone to the lower part of the tank body, and then spreads outward along the stabilizer at the bottom of the groove bottom, and slowly rises. The slurry movement track is "W" type.
V. Flotation column inflator The aerator is the heart of the flotation column and is the key to affecting flotation indicators and determining production reliability. Therefore, since the use of flotation columns, people continue to study the structural form and material of the aerator.
The structure of the inflator is: horn type, four-lobed type, multi-ball type, radial type, grate type, vertical tube type and the like. At present, the vertical pipe type is considered to be good, and most mines have been adopted.
Inflator materials are: ramie bag, No. 5 military canvas bag, 454 nylon canvas bag, hose, nitrile rubber tube, nozzle, ceramic tube, plastic bottle, microporous plastic tube, bed stone and water and gas aerator Wait. Among them, the ramie bag has good gas permeability and low cost, but there is still a problem of mild calcium formation; the nozzle aerator is simple, but easy to wear; although the ceramic tube has high strength, it uses a one-month micro-hole blockage and the wind pressure rises sharply. , high cost; nitrile rubber hose full of white silver dressing plant Nonferrous Metals company good results, at high alkalinity (pH value = 12 ~ 13) to solve the basic problem of calcium junction; on bed rock and inflator The use of water and aerators will be described below. In short, various aerators are currently in production, and microporous plastics are widely used (introduction to the manufacturing method of microporous plastic inflators); although the canvas bags have a short service life, they are easy to manufacture and materials are easy to obtain. Therefore, in some small ore dressing plants with low pH value, there is still some practical value; water and aerators are reported to have better effects, but they are still in the production experiment stage.
Bed stone and water, aerator are introduced as follows: [next]
(a) Bed Stone Inflator
Since 1971, Hongtoushan Copper Mine has been using bed stone aerators, and the production effect is better. feature is:
(1) The bed is sturdy and the maintenance period is long, generally more than half a year;
(2) The aerator itself has a simple structure and low material cost;
(3) Elimination of calcium formation.
The disadvantages of bed stone inflators are:
(1) The gas permeability is not as good as that of the canvas bag, and the bubbles generated are large;
(2) When the service period is more than half a year, there is a phenomenon of filling ore in the middle of the bed, so it should be cleaned once every six months to one year.
Bed stone aerator structure: mainly composed of diffusing hemispheres, coamings and partitions. See the figure below for details.
1. Diffusion hemisphere: welded by eight fan-shaped iron plates (thickness 5 mm), drilled on top, and formed a chamber with the inverted cone (funnel) below, the air is discharged from the hole, passing through the pebbles and gravel ( 8~20 mm) forms fine bubbles with a radius of 400 mm.
2. Seine net: In order to prevent the bed stone from being blown away by compressed air, a purse net is provided, and the purse net is welded by using a hole of 12 mm screen (eight pieces). After a radius of 1 m, after filling with pebbles, fasten them with bolts welded to the partitions.
3. Separator: divided into upper, middle and lower partitions, the purpose is to prevent the air column formed by the air bubble discharged from the air chamber from rising straight up, so that the air floats evenly between the partitions through the bed stone. Select the section of the column.
4. Bed stone: 8 to 20 mm pebbles, the thickness of the bed is 500 ~ 600 mm.
5. Conical body: Prevents the compressed air from forming a vertical air column, so that the pressure of the air is relatively uniform.
(2) Water and aerator The Maanshan Mine Research Institute and the field workers studied and produced a water and gas aerator for the flotation column. Valley copper mine in Nanjing, Jinping phosphorus ore, pyrite and other mountain has been used to good effect. Its main advantages:
1. The main difference from microporous plastic aerators is that the dispersion of air is formed by the high-speed eddy current of water and gas two-phase fluid. It can eliminate calcium and blockage and prolong the use period. Compared with the canvas bag inflator, there is no disadvantage of a drop in air quality, and thus a good process index is obtained;
2. When using water, aerator, and flotation column for short-term parking, you can not mine, thus reducing metal loss;
3. In production and use, the performance is stable and easy to replace.
The water used in the inflator must be clean and the water must not contain more than 0.3~0.4 mm of solid particles and fibrous substances. [next]
Water, the working principle of the inflator gas: air and water at a pressure of 2.5 to 4.0 kg / cm respectively, into the water pipe 8 and the intake pipe 9 (see FIG water, a configuration diagram of the inflator gas) water and air nozzle The mixture was mixed at 11 places, sprayed into the mixing chamber 13, and then ejected through the injection holes 12. The air dispersion of the inflator is formed by two jets of high-speed eddy current of the two-phase fluid. When the water and gas fluid pass through the nozzle 11 at a high speed, the airflow is subjected to water eddy shear stress, and is cut into tiny bubbles, which are sprayed into the water and gas mixing chamber, and the diameter of the bubble entering the chamber is generally 1 to 2 mm. This part of the bubble is ejected through the orifice 12, and the diameter of the bubble injected into the cylinder is mostly 4 to 6 mm without the addition of a foaming agent, which satisfies the requirements of flotation.
Comparison of test results between water and gas aerator flotation column and flotation machine (see table below)
[next]
Conditions for the use of water and gas aerators in the Nanjing Guli Copper Mine:
Air pressure = 6.5 kg / cm 2 ;
Water pressure = 8 kg / cm 2 ;
Mixing pressure > 3.5 kg / cm 2 ;
Air volume = 10 m3 / min.
The rough column is 3.6-4 m 3 /min (section is 1.54 m 2 );
The sweeping column is 3.4-3.6 m 3 /min (section is 2.01 m 2 );
The total water consumption of the two columns = 6.6 m 3 / hour;
The test proves that the air pressure = water pressure is good (generally the water pressure is greater than the pressure of 0.3 ~ 0.5 kg / cm 2 is better).
(3) Method for making microporous plastic aerator (according to the data of Chimashan Copper Mine)
1. Raw material: 2# polyvinyl chloride powder resin, white powder, origin Tianjin chemical plant, specifications are:
Absolute viscosity of 1% trichloroethane: 2.0~2.1湹; ash ≤0.2; fineness (+0.03 mm) ≤1.0%; iron content ≤0.01%; water and volatile matter ≤0.3%; water immersion conductivity : 10 × 10 - 5 ohm / cm 2 .
2. equipment:
(1) Mold: The material requirements are uniform and not easy to deform. Generally made of stainless steel or iron. The surface of aluminum products made more beautiful, black steel product surface.
(2) Oven: It is required to have uniform temperature in the upper and lower sides of the box, preferably with a hot air circulation device. Generally, an electric oven having a specification of 500×600×750 mm, 3600 watts, 220 volts, and 200° C± is used.
3. Manufacture: The dried polyvinyl chloride is sieved through an 80 mesh sieve to remove impurities, and then the mold is filled. When filling the mold, the core is tapped to make the mold evenly filled. After the filling, the glass rod is flattened and then fed into the preheating. Sintering in the oven (the oven is preheated to 220 °C), after the die is introduced to 180 °C ±, after heating to 185 ° C, the temperature is raised for one hour, then raised to 215 ° C ±, and the temperature is 35 to 40 minutes after sintering Finished (at this time, the top of the product is brownish black, the section is reddish brown). After taking it out of the box, immediately go to the inner mold, and put the outer mold into the pre-mixed 2% soapy water for cooling, and take out the outer mold to get the black tube. product. After turning, the air duct can be used by the factory after pressure test.
The mold that has been taken out must be placed in an oven and dried, and the rust and debris on the surface of the mold can be wiped off with abrasive cloth or dry cotton yarn before continuing to use.
Sintering temperature and time are the main factors affecting product quality. The temperature is too high or the heating time is too long, the product is carbonized, brittle, and the gas permeability is not good; the temperature is too low or the heating time is not enough, the product structure is loose, the strength is poor, the temperature in the oven is not uniform, and the color of each part of the product is different. Also affects strength. In addition, whether the charging is uniform, the cooling speed, and the smoothness of the mold surface will affect the quality of the product.
Dust Collector Accessories,Pulse Dust Collector,Baghouse Dust Collector,Portable Dust Collector
China Dust Collector Accessories,Pulse Dust Collector manufacturer, choose the high quality Baghouse Dust Collector,Portable Dust Collector, etc.
Dust Collector Accessories,Pulse Dust Collector,Baghouse Dust Collector Manufacturer in China
Dust Collector Accessories
China Dust Collector Accessories,Pulse Dust Collector manufacturer, choose the high quality Baghouse Dust Collector,Portable Dust Collector, etc.
Dust Collector Accessories
Dust Collector Accessories,Pulse Dust Collector,Baghouse Dust Collector,Portable Dust Collector
Hebei Wangjing Environmental Protection Co., Ltd. , https://www.wjdustcollector.com