Magnetic agglomeration beneficiation process and equipment

(1) Classification of magnetic agglomeration beneficiation process:
The magnetic agglomeration beneficiation process is divided into the following three types:
A simple selective magnetic agglomeration ore dressing is purely selective magnetic agglomeration, which is to add an external magnetic field, fine-grained ferromagnetic or weak magnetic particles in the mineral separation zone, and self-aggregate into a spherical shape under the action of external magnetic force. Chain-like magnetic polymer, separated from non-magnetic fine-grained gangue. The field strength of the applied magnetic field is generally low, only 4 to 16 kA/m.
Selective magnetic agglomeration of B combined with hydrophobic flocculation. If hydrophobic flocculation is carried out under an applied magnetic field, the magnetic mineral is agglomerated by both magnetic force and flocculation by hydrophobic flocculation. The particles will be bulky and compact. The magnetic polymer settles. This method is applied Ling manganese ore, iron ore and the separated diamond quartz, good results were obtained.
C magnetic sorting is the use of synthetic or finely ground ferromagnetic particles (micron or sub-micron) as a magnetic species, and the hydrophobic aggregation of the target mineral to form a magnetic aggregate of about 100 ~ 200 microns Then sort by magnetic separator.
Laboratory magnetic sorting of hematite and quartz has been successful. Which method is oleic 1:15 - coal-oil mixture as collector, with micron-sized magnetic minerals or artificial ground magnetite as a magnetic species into the water, the first with vigorous stirring until the formed magnetic reunion The substance is magnetically selected after dilution. When the grade of the ore is 34.5%, the concentrate grade is 53.1% and the recovery rate is 95.3%.
(2) Magnetic agglomeration and mineral processing equipment A magnetic agglomeration re-selection machine

The structure of the Soviet magnetic cluster re-selector is shown in Figure 1. It is a sorting cylinder 1 with a conical bottom, and the lower half of the cylinder is wound around a group of toroidal coils 2 which can generate a magnetic field strength of 5 to 16 kA/m. The slurry is fed from the guide tube 11 into the feed cylinder 3. Mineral particles in the slurry may form several non-selective aggregates due to electrostatic or other adsorption. These aggregates must be broken. Therefore, the slurry enters the lower part of the feeding cylinder, is first stirred and dispersed by the agitator 4, and then the magnetic field of the toroidal coil 2 is re-aggregated according to the presence or absence of magnetism. The magnetic particles, which are affected by the magnetic field, are naturally polymerized into magnetic agglomerates, concentrated toward the center of the cylinder 1, and are washed from the rising water flow near the sorting tray 7, and are settled downward from the annular space around the cylinder 1, and finally from the circle. The magnetic agglomerated particle discharge device 6 at the bottom of the canister 1 is discharged. The non-magnetic particles are lifted by the rising water flow, rise through the high-concentration magnetic particle suspension layer 8, and are discharged from the non-agglomerated particle discharge device 5. The rising water flow comes from the annular washers 9 and 10 which are tangentially sprayed at the bottom of the cylinder 1 cone. Reselection cylindrical magnetic separator is less than 0.044 mm accounted for 95% of the magnetic apatite results of comparative data. [next]
The use of magnetic agglomeration re-selection machine can generally save operating costs of 7 to 15%, reduce investment costs by 10 to 20%, and concentrate concentration of 65 to 70%.

The magnetic agglomeration equipment of Zhengzhou Institute of Minerals Comprehensive Utilization in China is shown in Figure 2. It has two main points different from the Soviet equipment: First, the mechanical mixing equipment is eliminated, and the method of tangential water supply to the lower part of the cylinder is used, and the shearing effect caused by the friction between the suspension and the crucible is used instead of stirring to The formed non-selective agglomerates are dispersed; secondly, a low magnetic field of 2 to 12 kA/m is formed by using 2 to 3 layers of permanent magnet blocks, and is divided into an inner magnetic system and an outer magnetic system to cause radial The uniform field strength, while the magnetic system in the vertical direction is intermittent, so that the ore particles are in a state of agglomeration, a loose agglomeration in the process of sedimentation, in order to eliminate non-magnetic particles entrained in the agglomerates, improve the concentrate Grade and sorting efficiency. The test results of the equipment in Shougang Qian'an Iron Mine and Waterworks Iron Mine show that under the condition of constant ball mill capacity, the magnetic reunion re-election operation can increase the production capacity of the concentrator by about 20%.
B Magnetic hydrocyclone

FIG 3 is a titanium-iron ore sorting Zealand magnetic hydrocyclone. It is characterized by a core with a ZTE opening. The upper end of the iron core is closed and the lower end is open. A set of ф2 mm 400 铜 copper wires are wound around the upper end. Since the outer surface of the iron core is larger than the inner core, the magnetic force of the hydrocyclone is opposite to the centrifugal force, and the magnetic product flows to the overflow pipe. When the magnetic agglomerates are operated from the feeding port to the overflow port in the hydrocyclone, shearing occurs due to different operating speeds of the liquid layers, so that the formed magnetic agglomeration is dispersed and agglomerated, and the magnetic agglomerates are continuously removed. The non-magnetic particles increase the grade of the magnetic agglomerates.
The diameter of the cyclone is 200 mm, and the straights of the ore, overflow and grit are 35 mm, 42 mm and 30 mm, respectively. The core has a diameter of 250 mm or 300 mm.

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