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dry and wet grinding in mineral beneficiation

feldspar dry processing beneficiation and purification

feldspar dry processing beneficiation and purification

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 crushingpendulum millingmagnetic 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. .

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 crushingpendulum millingmagnetic 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%.

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.

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.

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%.

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. .

minerals | free full-text | comparison of wet and dry grinding in electromagnetic mill | html

minerals | free full-text | comparison of wet and dry grinding in electromagnetic mill | html

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a comparative study on the effects of dry and wet grinding on mineral flotation separationa review - sciencedirect

a comparative study on the effects of dry and wet grinding on mineral flotation separationa review - sciencedirect

Water scarcity dictates to limit the use of water in ore processing plants particularly in arid regions. Since wet grinding is the most common method for particle size reduction and mineral liberation, there is a lack of understanding about the effects of dry grinding on downstream separation processes such as flotation. This manuscript compiles various effects of dry grinding on flotation and compares them with wet grinding. Dry grinding consumes higher energy and produces wider particle size distributions compared with wet grinding. It significantly decreases the rate of media consumption and liner wear; thus, the contamination of pulp for flotation separation is lower after dry grinding. Surface roughness, particle agglomeration, and surface oxidation are higher in dry grinding than wet grinding, which all these effects on the flotation process. Moreover, dry ground samples in the pulp phase correlate with higher Eh and dissolved oxygen concentration. Therefore, dry grinding can alter the floatability of minerals. This review thoroughly assesses various approaches for flotation separation of different minerals, which have been drily ground, and provides perspectives for further future investigations.

As an associate professor at the Lulea University of Technology, Prof. Chelgani developed various investigations in process modeling, flotation, leaching and coal processing. Since 2016, he has been an editorial board member of various journals Minerals, Materials, etc. and certified as an outstanding journal reviewer by various journals. He was adjunct prof. at University of Michigan between 2015 till 2018. He has been in several industrial and academia project and outcomes of those projects have been successfully published in high ranked journals (more than 90 articles and h-index: 25). Moreover, he has been awarded the most prestigious scholarships in Canada, and USA (OGS, NSERC, and outstanding researcher).

process of grinding and dressing equipment,dry grinding and wet grinding,self-grinding machine | prominer (shanghai) mining technology co.,ltd

process of grinding and dressing equipment,dry grinding and wet grinding,self-grinding machine | prominer (shanghai) mining technology co.,ltd

Mineral processing equipment: Grinding equipment is the key equipment for crushing ore after crushing. Grinding technology is very important to the selection of equipment, and grinding plays a role in linking up the beneficiation process. The grinding process includes three processes: ball milling, rod milling, and self-grinding.

For ore dressing, one or two stages of ore grinding can be used to grind the ore to any particle size required for ore dressing, economical and efficient. The grinding of more than two stages is usually determined by the requirements of the selection of the stages.

Compared with the one-stage and two-stage processes, the main advantages of the one-stage grinding process are: simple equipment, low investment, simple and convenient operation, and will not affect the work of the other grinding section due to the shutdown of one grinding section, which can be avoided. The loss is small, but the mill has a wide range of ore feeding size, reasonable ball loading is difficult, and it is difficult to obtain finer final products. The efficiency of the beneficiation equipment is low, which requires two stages of grinding. When the maximum particle size of the final product is required to be 0.2 to 0.15 mm, a stage grinding process is generally used. In small factories, in order to simplify the process and equipment configuration, when the grinding fineness is required to be 80%-200 mesh, a one-stage grinding process can also be used.

The outstanding advantage of two-stage grinding is that it can obtain finer products, and can be coarse and finely ground in different grinding stages, which is especially suitable for stage processing. In large and medium-sized factories, when the grinding fineness is required to be less than 0.15mm (ie 80%-200 mesh), it is more economical to use two-stage grinding, and the product particle size composition is uniform, and there is less over-crushing. According to the different connection mode of the first stage mill and the classifier, the two stages of grinding process can be divided into three types: the first stage is open; the second stage is fully closed; the first stage is partially closed, and the second stage is always closed.

There are two types of self-grinding process: dry grinding and wet grinding. Concentrators mostly use wet grinding. The technician pointed out that in order to solve the problem of hard-to-grind particles in self-grinding and improve the grinding efficiency, a small amount of steel balls are added to the self-grinding machine, which is called semi-self-grinding. Self-grinding often works in conjunction with grinding equipment such as fine crushing, ball milling, and gravel milling. According to its connection mode, it can form a variety of technological processes.

Crushing is the process of reducing the particle size of large pieces of material under the action of mechanical force. It is an important part of the mineral processing process. It can be divided into four stages: crushing, grinding, ultra-fine grinding, and ultra-fine grinding. The basic principle is "more broken and less grinding".

Prominer has been devoted to mineral processing industry for decades and specializes in mineral upgrading and deep processing. With expertise in the fields of mineral project development, mining, test study, engineering, technological processing.

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