I. Overview During the test, take an appropriate amount (for a magnetic separation tube of about Ñ„40mm to absorb 2~3g of magnetic product on the inner wall of the tube, and for a magnetic separation tube of about Ñ„100mm, generally 7~8g), a representative fine grinding sample is loaded. The pulp is slurried in a small beaker to make it fully dispersed. Then, the water is introduced into the glass tube, and the clip of the rubber tube at the upper and lower ends of the glass tube is adjusted, so that the flow rate of the water in the glass tube is kept stable, and the water surface is higher than the magnetic pole by about 30 mm. Turn on the DC power supply and adjust to the pre-specified amperage to start feeding. First, the part of the beaker in the beaker is slowly flushed from the upper end of the glass tube into the tube, and the ore is partially poured to the bottom of the cup. The magnetic ore particles are attracted to the inner wall of the tube by the magnetic force, while the non-magnetic ore particles are discharged from the lower end of the glass tube with the flushing water. Then continue to move and rotate the glass tube up and down to make the material better cleaned. When the gangue particles and slime are cleaned (the water inside the tube is clear and not turbid), stop the water supply and release the water. Water, replace the miner, cut off the DC power supply, and wash out the magnetic products. When a sample of magnetic analysis is not completed at one time, it can be divided into several times. After the completion, the concentrate and tailings are combined together for dehydration, drying, weighing, sampling, and chemical analysis, and the magnetic part is determined. The percent content in the sample evaluates the magnetic separation separation effect. [next] 1 Equipment specifications and structure The magnetic field strength adjustment range is 0.15-2.3T, and the maximum processing capacity is 10kg/h. Mainly composed of iron core, excitation coil, sorting box, feeding, rushing, and mining equipment. 1 Take 1-3g of ore sand in a single layer and sprinkle it on the glass plate and feed it into the working gap; Auto Parts grinding DFC system Sunvisor Door handle luggage rack Air conditioning bumper are common auto parts.Their grinding processing at present are manual, the force imposing on the Grinder is not consistent, most are based on technician experience or technique. Our Force Control System can flexible control the force imposing on the grinder, quick response to the surface changing, and instant adjusting the force on the grinder.It connects with Industrial Robot, which can highly improve working efficiency. Sunvisor DFC system,Door handle DFC system, Luggage rack DFC system,Air conditioning DFC system,bumper DFC system DARU Technology (Suzhou) Co., Ltd. , https://www.szdaruactivecontactflange.com
Magnetic sorting is generally used iron, manganese, nickel, chromium, titanium and some noble metals and non-ferrous ores. With the development of industry and science and technology, the application of magnetic separation is becoming more and more extensive, not only applied to the ceramic industry, the preparation of raw materials for glass industry and the treatment of metallurgical products, but also to the aspects of sewage purification, soot and exhaust gas purification. Magnetic separation is mainly used for sorting iron ore and selection of tungsten tin and rare metal ore.
The purpose of the magnetic separation test is to determine the optimum particle size for separation of minerals in a magnetic field, the possibility of separating concentrates and waste tailings from different particle sizes, the treatment of intermediate products, and the preparation of materials before magnetic separation (screening). Classification and classification, dust removal and de-sludge, magnetization roasting, surface treatment, etc.), magnetic separation equipment , magnetic separation conditions and processes.
Electrification is mainly used for selected operations, that is, the raw materials for electrification are generally coarse concentrates selected by re-election or other beneficiation methods, and electro-selective separation of symbiotic heavy minerals and improvement of concentrate grade. Of course, some minerals are directly sorted by electrical selection. Electro-election is very effective for the separation of various coarse-grained heavy minerals and for improving the concentrate grade. Some minerals are difficult to separate by flotation, re-election or magnetic separation, but they can be effectively separated by electro-election.
Second, the magnetic separation test
Magnetic separation is a beneficiation method for separating minerals based on the differences in magnetic properties of various minerals. Therefore, in order to determine whether the ore to be studied can be magnetically selected, it is necessary to first study the magnetic properties of the ore, that is, to perform magnetic analysis on the ore beforehand, and then conduct preliminary tests and formal tests to determine the magnetic separation operating conditions and process structure.
(I) Magnetic analysis of ore The purpose of magnetic analysis of ore is to determine the magnetic size and content of magnetic minerals in the ore. Magnetic analysis is usually performed when conducting mineral evaluation, ore selectivity studies, and testing the work of magnetic separation plants and magnetic separators.
The magnetic analysis of the ore mainly includes the determination of the specific magnetic susceptibility of the mineral and the determination of the magnetic mineral content in the ore.
1. Determination of the specific mineral ratio of the ore in the ore The determination of the specific magnetic ratio of various minerals is of great significance in the research of magnetic selectivity.
After determining the specific magnetic susceptibility of useful minerals and gangue minerals, their sorting effects can be estimated initially. Minerals can be divided into three categories according to their magnetic strength;
(1) Strong magnetic mineral The specific susceptibility of this mineral is greater than 35*10 -6 m 3 /kg. The main types of such minerals are magnetite, titanomagnetite, maghemite, and pyrrhotite. Such minerals are readily selectable minerals and can be sorted using a weak magnetic field magnetic separator of approximately 0.15T.
(2) Weak magnetic minerals The specific magnetic susceptibility of this mineral is 7.5~0.1*10 -6 m 3 /kg, which belongs to the most minerals of this kind, such as various weak magnetic iron minerals (hematite, limonite, Siderite, chromite, etc.), various manganese minerals (manganese ore, hard manganese ore, rhodochrosite, etc.), most of which contain iron and manganese minerals ( tungsten , ilmenite, monazite, coltan , Niobium ore, manganese ore, etc.) and some rock-forming minerals (chlorite, garnet, biotite , olivine, pyroxene, etc.). Some of these minerals are easier to select, and some are more difficult to select, so the required magnetic field varies widely, about 0.5~2.0T.
(3) Non-magnetic minerals The specific susceptibility of such minerals is less than 0.1*10 -6 m 3 /kg. Existing magnetic separation equipment cannot be efficiently recycled. It belongs to many minerals such as scheelite , cassiterite and natural gold: non-metallic minerals such as coal , graphite , diamond and kaolin ; right-handed minerals such as quartz , feldspar and calcite . Such minerals are very magnetic and can be recovered by magnetic separation with the development of magnetic separation technology. [next]
2. Analysis of magnetic mineral content The magnetic separation tube, manual magnetic analyzer, automatic magnetic analyzer, wet magnetic analyzer and AC/DC electromagnetic sorter are used to analyze the magnetic mineral content in the ore to determine the magnetic separation. Sex indicators, industrial evaluation of the deposit, inspection of the magnetic separation process and the work of the magnetic separator.
The requirements for magnetic analysis instruments are: the accuracy of mineral separation by minerals is high; the adjustable range is relatively wide; the loss of processing a small amount of material is not more than 2%.
(1) Magnetic separation tubes are often used for magnetic analysis of fine-grained ferromagnetic minerals.
The magnetic tube structure is shown in Figure 1. A coil is wound around the "C" shaped iron core, and the direct current is applied. The current intensity can be adjusted by a varistor, and the maximum magnetic field strength can reach 160~240 kA/m. The glass tube (slightly larger than the gap of the magnetic pole, generally ф40~100mm) is supported by the bracket in the middle of the magnetic pole and at an angle of 45° to the horizontal. With a suitable transmission, the motor is used to drive the ring on the bracket (on the outside of the glass tube) to reciprocally move and rotate the glass tube up and down. Some have no transmission, then move up and down by hand. 
Figure 1 Magnetic tube outline drawing
1—iron core; 2—coil; 3—glass tube; 4—water supply pipe
The magnetic separation products obtained by experiments with a large number of samples on laboratory magnetics or industrially produced are mostly magnetically analyzed by magnetic separation tubes to check the content of magnetic minerals in each product to evaluate the magnetic separation effect.
For ore with a relatively simple composition, such as a single magnetite ore, the magnetic analysis results of the magnetic separation tube can meet the needs of the mineral industry evaluation.
(2) Wet strong magnetic analyzer The magnetic analysis can be performed by a laboratory type wet magnetic separator. This machine is a beneficiation test equipment developed by absorbing the characteristics of foreign Jones and Eriz-type magnetic separators and combining the needs of small-scale tests. Its structure is shown in Figure 2.
Figure 2 Schematic diagram of the construction of wet strong magnetic separator
1—mixer; 2—mixing drum; 3—feeding valve; 4—three-way valve; 5—cooling water jacket; 6—flat mouth moving rod;
7— copper flat mouth; 8—excitation coil; 9—iron core; 10—separation box; 11—bearing funnel;
12, 13, 14—fine, medium and tailings mining buckets; 15—eccentric wheels; 16—micro-motion
The iron core adopts a square magnetic circuit, and the distance between the magnetic pole heads is 42 mm. [next]
The excitation coil is wound with a braided flat copper wire. There are 8 wire packs, which are arranged on both sides near the pole head. The maximum allowable working current is 20A. A sandwich copper cooling water jacket is arranged between the coils.
Two aluminum plates and tooth substance from the tank flap sorting five pure iron composition, pointed teeth 100 °. The two tooth plates next to the magnetic pole head are single-sided, and the rest are double-sided tooth plates. All the tooth plates are fixed by a grooved aluminum baffle with a tooth pitch of 1.5 mm and a pitch of 6.25 mm. In order to meet the needs of sorting different types of ore, there is a spare sorting box.
The feeding, rushing and ore-receiving device has a mixing tank in the upper part of the sorting box. The bottom of the mixing tank (or funnel) has a feeding valve controlled by an electromagnet. The lower end of the valve is provided with a copper flat mouth of 35 mm long and 2 mm wide. The mouth is reciprocated by the balancing motor. The slurry is evenly fed into the sorting box from the mixing drum through the feed valve and the flat mouth.
The mine cleaning and concentrate flushing water are controlled by 19mm and 25mm solenoid valves respectively. The tee between the mine valve and the flat nozzle enters the sorting box from the flat nozzle.
The ore from the sorting box is discharged into the collecting box through the funnel. The funnel is oscillated by a reversible motor and an eccentric link mechanism. When the operating console turns on the motor power for a given time, the funnel starts to oscillate. When swinging to the upper part of a certain receiving tank, the contact on the eccentric wheel is disconnected from the micro switch, the power is cut off, and the swing bucket is automatically stopped at this position; After the mine is finished, it is started again, and then stopped on another receiving bin, and then cycled in order to realize separate access of the products.
2 operation. The entire operation process includes feeding, sorting, cleaning, discharging, and switching the position of the concentrating funnel, all automatically controlled by a digital timer according to a predetermined program. Finally, the magnetic products and non-magnetic products are dried, weighed, and sent to the test.
(3) Manual dry magnetic analyzer The manual magnetic analyzer is shown in Fig. 3. It is mainly composed of iron core 1, tooth pole 2, flat pole 3 and coil 4, and the tooth pole can move up and down. After the direct current is applied, a strong magnetic field is generated between the two magnetic poles, and the strength of the magnetic field strength can be realized by adjusting the excitation current and the pole distance. Generally, the working magnetic field strength between the two poles can vary from 0.1 to 1.8 T (up to 2 T or more). If there are different magnetic minerals in the sample to be analyzed, the separation can be performed in order of magnetic strength. The sequence of operations is as follows:
Figure 3 Schematic diagram of manual dry magnetic analyzer
1—iron core; 2—tooth pole; 3—flat pole; 4—coil; 5—arm; 6—screw [next]
2 adjust the distance between the tooth pole and the mineral layer on the glass plate according to the particle size of the sample;
3 Passing a certain amount of excitation current, moving the glass plate horizontally back and forth to make the magnetic ore particles suck on the tooth pole;
4 Take out the ore glass plate and replace it with another glass plate that is connected to the concentrate;
5 The current is cut off, and the magnetic ore particles sucked on the tooth pole fall on the glass plate, which is a magnetic product. When the sample weight is large or the grain test is fine, one sample is finished in several times, and after weighing, the weight percentage of each product can be calculated.
Since the magnetic force of the magnetic ore particles increases sharply as the distance between the tooth pole and the ore particles decreases, the glass plate should always move against the flat pole during the operation, so that the whole operation process is under the same magnetic force. get on.
(4) Automatic magnetic analyzer The magnetic field strength of this magnetic analyzer can be uniformly adjusted within the range of 0.01~2T, suitable for dry separation of weak magnetic ore less than 1~0.075mm.
As shown in FIG. 4, the automatic magnetic analyzer is composed of a core 1, a magnetic pole 2, a coil 3, an electric vibration sorting tank 4, and the like. The upper end of the electro-vibration sorting tank has a feed ring 5 and an electric feeder, and a lower end has a receiving funnel and a receiving cup 6. The magnetic analyzer is placed on the cantilevered bracket 8 with a mandrel, and the longitudinal slope of the sorting tank can be changed by turning the hand wheel 9. The cantilever bracket is fixed on the base by the mandrel, and the rotating mandrel is equipped with a rotating hand wheel, which can be used to change the lateral slope of the electric vibration sorting groove.
Figure 4 automatic magnetic analyzer
1—iron core; 2—magnetic pole head; 3—coil; 4--electrovibration sorting tank; 5—feeding cup;
6—feed cup; 7—electric vibration feeder; 8—bracket; 9—turning handwheel