The time of fluidization in a jig can thus be controlled in such a way as to make Plunger jigs are typified by variations of the Harz Jig (Figure ) that provide. HARTZ TYPE JIG. • List item here. • List item here. • List item here. • List item here . Over 50 years, Mineral Process. Equipment Pvt. Ltd. has enabled cus-. mineral jig and Harz jig. The operating variables used to determine the effectiveness of jigging include, particle size, velocity of water and amplitude. Recovery of.
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It will be noted that the valuable mineral is in coarse, medium, or fine grains, and that in order to sever these from the quartz, so that the concentrator can save them, we have to jgi how fine the recrushing shall be. When the water is increased by the cock the full effect does not take place until the water has risen in the annular space between the inner and the jib V to its full height, due to the increase.
It will have slime mixed with its fine sand. Here the pulsations are given to the sand from the forward hagz due to the opening and closing of the cock, which revolves times a minute, more or less, giving about forward pulsions, with an instant of repose between the pulsions.
We come now to the study of the effects of improved classification upon the different machines, and we will first take jjg the Harz jig, and call attention to the fact that this jig has a plunger which falls and rises, and as it does so, it first sends a pulsion of water up through the grains of sand, causing the same action as the hindered-settling classifier, and, second, the water goes down through the bed of sand, sucking down into the hutch the fine grains which are lying in the interstices uig the quartz.
It is ideal for use in cyanide, flotation, and gravity-concentration mills; base-metal and nonmetallic mills; tungsten- gold mills; and placer operation; to save minerals as coarse and as soon as possible, thus reducing grinding cost.
Comparing the pulsator-jig with the plunger-jig as they have been tested in the mills: Its water consumption is jog than the Selective Mineral Jig. Many plants are treating ores in which the gangue is free at a coarse mesh and hars a coarse bulk concentrate is economical. The feeder next sends it to a trommel with 8-mm.
The open circles at the left represent quartz with a gravity 2.
jlg Suction due to the movement of water-columns supplements gravity. The fault is due mainly to two causes: If the plant is using a flotation machine which can handle. As the quantity of particles in the fluid increases, the effect of particles crowding becomes apparent and the settling rate of the particles decrease. The oversize of this trommel is fed to the bull-jig, which therefore treats mm, to 8-mm.
Harz Jig Concentrators
By using pebbles, perhaps 1 in. About project SlidePlayer Terms of Service. Six tests were made in each series with each of the above three sets of conditions, using the same size of quartz in all cases, but varying the size of blende from coarse to fine in each of the three sets. The amplitude in the jigging is greatest in the first cell and least in last, so as to make concentrate in the first compartment And middling in the other compartment. We have to decide in regard to included grains whether they are rich enough to go direct to the furnace, or poor enough to throw away, or whether they lie between these two points and require recrushing as the only means of severing the values from the waste.
The fine free mineral grains liable to contaminate the tailings of the concentrators that follow are much easier kept out from those tailings. From what has already been said it will be understood that the act of pulsion or the movement of rising current in jigging is identical in its action with the hindered-settling rising current. The reactions occurring during pulsion and suction are the only reactions of jigging.
Here the grains also settle according to their size, harrz larger going faster, but the galena grains settle much faster than quartz of the same diameter. The side tube represents here the relations between the grains Fig. By using a series of currents starting with the strongest, rising We have a metallurgical test for every possible mineral type and treatment.
Comparing the pulsator-jig with the plunger-jig as they have been tested in the mills:. It has, however, one rather serious disadvantage in the fact that it requires greater force in the rising current on the up-stream side, B, of the regulating-disk, C, than on the down-stream side; this necessitates using more water on the down-stream side than is necessary for cleaning the sand, and makes the classifier a large water-user. The large quartz grain has a short vertical arrow representing kig, and a longer horizontal arrow representing the force of the water.
The Wilfley table may be fed with: Perhaps the canvas table is the most successful, and we may say that it is possible that some of the flotation-processes may succeed in saving this class of grain.
Prepared By:- Prabir Kumar Roll No/08 Ravi Kumar Roll No/08 – ppt video online download
Why is the second- or third-spigot product of a hindered-settling classifier better feed for a plunger-jig than the second- or third-spigot product of a free-settling classifier?
This jig is made in various sizes. This calls for another paper. Such a computation for bulbs 4, 5, and 6 gave the results in Table V. Since it requires only one-quarter, more or less, of the velocity required by free-settling to do the work, it should require only one-quarter the quantity of water.
By putting this plane considerably lower, it is believed that this No.
The advantages gained by the pulsator-jig far more than compensate for the above-mentioned disadvantage. These grains cannot be handled, therefore, by settling. Using Fastest Grains only. The tailings are free from fine free mineral. This also calls for another paper. The plunger-jig, however, adds another very important feature, namely, the act of suction, or return-downward current. Any advantage that the small heavy grain would have over a large light one would, of course, appear in the resultant tending to carry it to the hutch.