water cooling electromagnetic separator for Quartz
PTMS MAGNETIC SEPARATOR
what is magnetic separation process？
There are many processes for quartz beneficiation and purification. Generally, the type, content, occurrence state and product quality requirements of impurities in quartz are determined. The common quartz sand beneficiation purification process is as follows:
(1) Scrubbing---grading and de-sludge
Quartz sand In the process of weathering sedimentation and mineralization, a large number of clay minerals and iron form cement or adhesion minerals on the surface of quartz. The use of scrubbing---grading and desliming processes to remove clay impurity minerals, muddy iron and some thin film iron is a common process for the purification of such quartz. For example, the Jiangjin quartzite mine in Sichuan used this process to reduce -0.1mm fine mud and iron, which increased the silica from 85.4% to 97.4%, and the ferric oxide decreased from 0.63% to 0.165%. The process is generally used as a pretreatment process before the ore is selected, and the muddy impurity minerals are effectively removed.
(2) Scrubbing - Desliming - Magnetic Separation
In general, quartz common impurity minerals, such as limonite, tourmaline, hematite and biotite, such as weak magnetic mineral magnetite, can only be removed by magnetic separation process, and in actual production, The wet magnetic machine is used for sorting, and the magnetic field strength is about 13,000 oersted. In some places, after the silt-sanded silica sand was rubbed and eluted, the sand contained 0.36% of ferric oxide. The SHP-500 wet-type magnetic machine was used to purify the above-mentioned scrubbed elution sand, and the content of ferric oxide was 0.16. %.
(3) Rod scrubbing-de-sludge---magnetic separation-flotation---acid leaching
After the quartz sand ore is separated by scrubbing, magnetic separation and flotation, the lower impurity mineral particles (including monomers and aggregates) are basically removed, and the purity of the silica can generally reach 99.5%-99.9%. It can basically meet most industrial uses of quartz sand. However, in order to further use ultra-high-purity quartz, it is necessary to perform acid leaching treatment on impurities on the surface of quartz particles in the form of spots and inclusions. According to different industrial uses, different impurity minerals (Fe, AL, Ti, Cr) requirements, mixed acid leaching treatment of different concentrations and ratios, such as the quartz content of a quartzite ore in Hunchun is 99.76%, containing fine inclusions, the main impurity minerals Fe, AL, Ti, etc. Mineral and iron oxide forms exist. After the rod scrub-de-sludge---magnetic separation---flotation---acid leaching process, high purity quartz having a silica content of 99.99% or more is obtained.
(4) Dosing and high-efficiency strong scrubbing - graded desilting - magnetic separation
After a detailed and in-depth experimental study on a quartz purification in Yunnan, we first creatively used the new purification process of high-efficiency strong scrubbing, graded desilting-magnetic separation, and achieved success. The process is to improve the structure of the existing scrubbing equipment, optimize the technical parameters, remove more than 80% of the impurities iron and aluminum ore by high-efficiency strong scrubbing and fractional de-slurry, magnetic separation is mainly to remove iron-containing impurity minerals. . After the treatment by this process, high-quality refined quartz sand with silica ≥99.8%, ferric oxide ≤0.023%, aluminum oxide ≤0.05%, and titanium dioxide ≤0.02% can be obtained, and the sand for the first-order optical glass is obtained. Requires, and the yield of concentrate is as high as 73%, while the rod scrub yield is only 49% and the silica recovery is 72.8%. Further purification and acid leaching treatment can obtain high purity quartz with silica ≥99.9%, ferric oxide ≤0.005%, aluminum oxide ≤0.05%, and titanium dioxide ≤0.02%. It overcomes the shortcomings of iron secondary pollution caused by rod scrubbing and low yield.
