water cooling electromagnetic separator for Feldspar
PTMS MAGNETIC SEPARATOR
what is magnetic separation in Feldspar？
Research and development status of potassium and sodium feldspar mine iron removal technology
In recent years, a lot of researches have been done on the beneficiation and purification of potassium-sodium feldspar at home and abroad, including the following aspects:
(1) crushing of ore
The pulverization process of the feldspar mine includes crushing and grinding. The pulverization of feldspar is on the one hand to meet the particle size requirements of the final product, and on the other hand is also required for the impurity removal process. At present, feldspar grinding is mainly divided into dry method and wet method. The wet grinding efficiency is higher than that of dry method, and it is not easy to appear “over-grinding” phenomenon. Most of the feldspar processing in the glass industry uses steel rod media grinding, high grinding efficiency, uniform particle size, but iron pollution, resulting in low quality feldspar; ceramic industry using stone wheel milling or porcelain ball grinding, grinding efficiency Low, high energy consumption. On the basis of ensuring the high quality of feldspar products, achieving high-efficiency grinding and continuous production is an important topic in the research of feldspar processing and purification.
Chen Guoan adopted the process of “hammer crushing→pendulum milling→magnetic separation” to obtain high quality feldspar concentrate containing Fe2O30.05%. Gao Huimin et al. adopted the process of “wet rod grinding and spiral grading closed circuit – weak magnetic separation and strong magnetic separation” to make the feldspar concentrate containing Fe2O30.09% after one sorting of feldspar mine with Fe2O3 content of 0.17%. The yield was 92.2%.
(2) washing and de-sludge
Washing is suitable for feldspar produced from weathered granite or feldspar sand mine. It mainly removes impurities such as clay, fine mud and mica, which can reduce the Fe2O3 content in the feldspar ore and increase the potassium and sodium in the feldspar mine. content. The washing process often uses a vibrating screen or a washing tank. It uses clay, fine mud, mica with small particle size or small sedimentation velocity (light specific gravity), and is easily separated from coarse feldspar under the action of water flow.
Desliming is mainly to remove the primary slime in the ore and the secondary slime produced by grinding, etc., to prevent a large amount of fine mud from affecting the sorting effect of subsequent operations (such as flotation, magnetic separation, etc.). Usually de-sludge in a single or composite force field, commonly used equipment such as mud hopper, centrifuge, hydrocyclone. In addition, because the amine collector is very sensitive to slime. RNH3+ is easily adsorbed on the surface of the negatively charged slime particles, which not only consumes a large amount of collector, but also often causes a large amount of viscous foam, which makes the process lose selectivity and reduces the flotation effect. Therefore, when using an amine collector, the flotation slurry needs to be preliminarily delimed.
(3) Magnetic separation
Since iron minerals, biotite, amphibole and tourmaline in feldspar have certain magnetic properties, they can be separated from feldspar under the action of an external magnetic field. Generally, such minerals in feldspar are weak in magnetic properties, and only strong magnetic separation equipment can achieve better sorting effects.
At present, the domestic magnetic separation equipment for feldspar iron removal mainly includes: permanent magnet roller type strong magnetic separator, permanent magnet barrel medium strong magnetic field magnetic separator, electromagnetic flat ring strong magnetic separator, electromagnetic induction roller type strong magnetic Machine selection, high gradient magnetic separator and superconducting magnetic separator.
The high-gradient magnetic separator is the most effective magnetic separation equipment for removing iron minerals and mica from fine-grain minerals. Its background magnetic induction intensity can reach 2.0T (up to 5.0T abroad), and it can be -0.074mm feldspar mine. Purification. Changsha Mine Management Institute used CRIMM type high gradient magnetic separator to carry out beneficiation and purification of Hunan Pingjiang feldspar mine. After primary magnetic ore separation, the Fe2O3 content can be reduced from 0.2% to 0.05%. The Mingguang feldspar mine in Anhui Province uses the Slon vertical ring pulsating high gradient magnetic separator developed by the Zhangzhou Nonferrous Metal Research Institute for beneficiation and purification. The primary ore can reduce the Fe2O3 content from 0.6% to less than 0.3% after primary magnetic separation. The use of high-gradient magnetic separators to remove iron is an effective way to produce high-grade feldspar products. The disadvantage is higher equipment and operating costs.
Potassium-sodium feldspar purification program
The potassium and sodium feldspar beneficiation purification scheme is designed according to the mineral properties of different regions. The company has magnetic separation, re-election, flotation, light selection, electric selection, ultrasonic selection, chemical beneficiation and other mineral processing techniques to adapt to different minerals in different regions. Mineral processing requirements of different customers.
Among all kinds of common feldspars, potassium feldspar is mainly in the form of perlite, feldspar, and micro-plagioclase. It belongs to potassium-sodium mixed feldspar, and its potassium-sodium ratio is 1:1, 2 respectively. :1,4:1, in the industry, the latter two are more common, in which the high potassium feldspar is mostly micro plagioclase, and its albite content is generally about 20%. The albite belongs to the plagioclase subfamily, and its theoretical content of Na2O is 11.80%.
It can be understood that the common feldspar is a mixed mineral of potassium albite.
The potassium and sodium feldspar beneficiation purification scheme is the feldspar removal process. With the development of the economy, the demand for ceramic raw materials and feldspar products is increasing, and the quality requirements thereof are also increased, and the ore quality of the feldspar ore mined is low. It is generally symbiotic with quartz, mica minerals, calcite and rutile, and must be processed in mineral processing to be better applied to industrial production.
The magnetic separation process of the potassium and sodium feldspar beneficiation purification program reduced the content of ferric oxide in the ore from 0.17% to 0.03%, reaching the international leading level.
The flotation process of potassium and sodium feldspar beneficiation purification scheme is mainly used for the separation of feldspar and quartz, the separation of feldspar and mica, and the separation of feldspar and iron-bearing minerals.
The magnetic flotation combined ore dressing process in the potassium and sodium feldspar beneficiation purification scheme is suitable for some high-iron ore refractory ore, not only high in iron content, but also some of the iron minerals are infiltrated by feldspar in the form of iron dyeing, and can be used for joint ore dressing. .
