Research of the influence of material composition and size of iron quartzites of the Olenegorsk deposit on the results of dry magnetic separation

2020 ◽  
pp. 15-20
Author(s):  
S. V. Tereshchenko ◽  
◽  
D. N. Shibaeva ◽  
S. A. Alekseeva ◽  
A. A. Kompanchenko ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Structural Features ◽  
Magnetic Fraction ◽  
Magnetic Separator ◽  
Mass Fractions ◽  
Dry Magnetic Separation ◽  
Iron Quartzites ◽  
Increased Strength ◽  
Grinding Efficiency ◽  
Ferruginous Quartzites

On the example of a sample of ferruginous quartzites from the Olenegorskoye deposit, the possibility of preliminary concentration by dry magnetic separation (DMS) has been established. The mineralogical and petrographic studies have shown that, in terms of their textural and structural features and mineral composition, ferruginous quartzites may be divided into two types, differing in the amount of hematite included in their composition, which indicates the possibility of using DMS to generate the following three separation products: magnetite, hematite-magnetite, and rock. DMS with the use of a laboratory drum magnetic separator allowed selecting the upper size limit of 80 mm for lumps entering the separation. At the same time, 24.7 to 26.0 % of all waste and low-mineralized rocks with the mass fraction of Fetot of 4.51 to 6.07 % are transferred to the non-magnetic fraction during the separation of classes of –80+50 and –50+25 mm. For the size class of –25+10 mm, the yield and Fetot values are within the same limits. It has been shown that sulfidecontaining rocks and rocks of increased strength (with the strength coefficient of at least 23) are separated into the non-magnetic fraction. The strength of ferruginous quartzites does not exceed 20. This rock strength ratio confirms improved crushing and grinding efficiency. The possibility of separation of the magnetic fraction with the particle size of –80+25 mm into the following products has been established: the magnetite-hematite product (MF-1 + MF-2) with the mass fractions of Femagn 43.3% and Fehem 14.9 %, and the predominantly hematite product (MF-3 + MF-4) with the mass fractions of Femagn 1.1 % and Fehem 67.9 %.

scholarly journals Distribution of As within Magnetic and Non-Magnetic Fractions of Fluidized-Bed Coal Combustion Ash

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1411
Author(s):  
Filip Kovár ◽  
Lucie Bartoňová
Keyword(s):  
Fluidized Bed ◽  
Magnetic Separation ◽  
Coal Combustion ◽  
Coal Ash ◽  
Magnetic Fraction ◽  
Fluidised Bed ◽  
Fe2o3 Content ◽  
Dry Magnetic Separation ◽  
Joint Occurrence ◽  
Crucial Parameter

Separation of coal ash into magnetic and non-magnetic fractions facilitates their utilization when processed separately. Due to desulphurization additives added to coal during the fluidised-bed combustion, non-magnetic fractions often contain elevated CaO levels (while magnetic concentrates are typically rich in Fe2O3). Both CaO and Fe2O3 are known for their ability to bind As during the combustion, whose distribution is a crucial parameter in terms of proper utilization of these fractions. Therefore, the study deals with the As partitioning within magnetic and non-magnetic fractions of fluidized-bed coal combustion ashes. Two different (successive) procedures of dry magnetic separation were used to separate each ash into strongly magnetic, less magnetic, and a non-magnetic fraction. Due to their optimal utilization, the concentrations of As and other target elements in these fractions were evaluated and compared. Magnetic concentrates from the first separation step (in vibrofluidized state) contained 60–70% Fe2O3, magnetic concentrates separated manually out of the residues after the first separation contained 26–41% Fe2O3, and the non-magnetic residues contained 2.4–3.5% Fe2O3. Arsenic levels were the highest in the non-magnetic residues and gradually decreased with the increasing Fe2O3 content in the magnetic fractions. The dominant As association in the studied samples was to CaO (r = +0.909) and with SO3 (r = +0.906) whereas its joint occurrence with Fe2O3 was improbable (r = −0.834).

scholarly journals Dry magnetic separation technology for the recovery of iron minerals in fine-grained steel slag

2020 ◽  
Vol 40 (1) ◽  
pp. 7-16
Author(s):  
Liang Chang Shi ◽  
Nan Sheng Wang ◽  
Gan Cheng
Keyword(s):  
Particle Size ◽  
Magnetic Separation ◽  
Steel Slag ◽  
Separation Distance ◽  
Magnetic Separator ◽  
Separation Technology ◽  
Fine Grained ◽  
Dry Magnetic Separation ◽  
Concentrate Grade ◽  
Parameter Values

Using the MagNet software package, a permanent magnetic circuit was simulated and a sectorially-spliced magnetic system was designed. Consequently, a new roller permanent magnetic separator with different magnetic field intensities in each roller was developed. The modular structural design allows fine-grained minerals with different magnetic susceptibility to be separated in one pass, according to their different processing characteristic. Steel slag, selected from a factory, was crushed, ground and sieved into different particle size ranges for the single-factor magnetic separation experiments. It was determined that the optimum value ranges for the particle size, magnetic separation distance and rotating frequency were 0.15 mm-0.3 mm, 10 mm-12 mm, 40 Hz～60Hz, respectively; using the chosen parameter values of 0.2mm, 11mm, and 40Hz, the concentrate recovery and concentrate grade of the new separation technology reached up to 52.78% and 64.74%, in comparisson with the existing technology. Thus, it was demonstrated that the self-developed separation technology has the potential to improve the iron recovery of the fine-grained steel slag.

scholarly journals Study of a possibility of enrichment of fine-crushed magnetite ore by dry magnetic separation

2019 ◽  
Vol 75 (5) ◽  
pp. 564-571
Author(s):  
N. V. Sedinkina ◽  
O. E. Gorlova ◽  
N. V. Gmyzina ◽  
E. Yu. Degodya
Keyword(s):  
Magnetic Separation ◽  
High Efficiency ◽  
Magnetic Fraction ◽  
Magnetite Ore ◽  
Ore Processing ◽  
Initial Stage ◽  
Specific Magnetic Susceptibility ◽  
Dry Magnetic Separation ◽  
Lower Limits ◽  
And Storage

Dry magnetic separation (DMS) enables to separate the non-magnetic fraction of iron ores at the initial stage of their concentration and therefore to decrease cost of their further processing. However, a considerable amount of metal is lost in DMS tails at that. The efficiency of DMS considerably depends on difference between the upper and lower limits of the ore coarseness) ore coarseness range), delivered for concentration. At the Magnitogorsk steel-works crushing and concentration plant No. 5 this range is from 50 mm up to 15 mm. To determine the optimal ore size, delivered to DMS, studies accomplished to determine the specific magnetic susceptibility of the magnetite and the burden for the magnetite ore of Maly Kuibas deposit. After the study of different size iron ore separation, a reasonability of the DMS feed size decreasing down to 30–7 mm shown. A possibility to obtain additional product of 7–0 mm size determined, suitable for sintering. It will enable to decrease the amount of material, delivered for crushing and wet magnetic separation, as well as to decrease expenses for transporting and storage of wet separation tails. Peculiarities of fine magnetite ore processing by DMS in a suspended state considered, optimal parameters of the separator determined and its high efficiency for magnetite ore of 7–0 mm size concentration shown.

Improvement of the technology for processing siderite ore from the Bakal deposit

2021 ◽  
Vol 27 (4) ◽  
pp. 6-12
Author(s):  
Е. Degodya ◽  
◽  
N. Sedinkina ◽  
О. Shavakuleva ◽  
N. Gmyzina ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnesium Oxide ◽  
Magnetic Separation ◽  
Mass Fraction ◽  
Iron Ore ◽  
Raw Material ◽  
Magnetic Fraction ◽  
Suspended State ◽  
Dry Magnetic Separation ◽  
Siderite Ore

The Urals is one of the unique iron ore provinces of the world, including all the variety of iron ores. Siderite ores are represented by the Bakal group of deposits, in which siderite in mineralogical terms is not a chemically pure iron carbonate, but has an isomorphic admixture of magnesium and calcium, forming sideroplesite and pistomesite. The main iron ore mineral of the siderite ore of this deposit is an isomorphic mixture of iron, magnesium and manganese carbonates, which occur in different quantitative ratios. A scheme for ore dressing is proposed, which includes crushing to a size of 10-0 mm and dry magnetic separation in a suspended state at a magnetic field strength of 52 k/m. The study of dry magnetic separation of siderite ore was carried out on a suspended separator with a constant magnetic field and on an electromagnetic separator 138T-SEM. The resulting magnetic fraction is sent to the baking, subsequent crushing to a size of 2-0 mm and dry magnetic separation in the suspended state. To increase the mass fraction of iron and reduce the mass fraction of magnesium oxide, the magnetic fraction is sent for grinding and wet magnetic separation. The results of the experiments have showed that the enrichment using high-intensity dry magnetic separation of siderite ore from various sections of the deposit, the mass fraction of MgO decreased from 9.4-12.3% to 8.0-10.1%, and the mass fraction of iron increased from 28.8-33.4% to 31.4-40.8%. As a result, a product with a mass fraction of iron 59.3-60.1% and magnesium oxide 10.0-11.3% has been obtained. The developed enrichment technology allows us to obtain conditioned raw materials, which can serve as a promising raw material for PJSC Magnitogorsk Iron and Steel Works (PJSC MMK)

scholarly journals Variables and Applications on Dry Magnetic Separator

2018 ◽  
Vol 53 ◽  
pp. 02019
Author(s):  
Qin Xing Zong ◽  
Luo Zhen Fu ◽  
Lv Bo
Keyword(s):  
Rare Earth ◽  
Magnetic Separation ◽  
Large Scale ◽  
Magnetic Particles ◽  
Water Shortage ◽  
Heavy Mineral ◽  
Magnetic Separator ◽  
New Ideas ◽  
Dry Magnetic Separation ◽  
Separation Equipment

Magnetic separation is an indispensable part of magnetic separation, and the dry magnetic separator can be selected under the condition of water shortage in China to ensure that our country can also be selected under the conditions of lack of some resources. The magnetic separator plays a role in improving the grade of ore, purifying solid and liquid materials, and recycling waste. With the application and development of magnetic separation technology, magnetic separation equipment is constantly updating and replacing, and dry magnetic separation has experienced remarkable technological progress over the past twenty years. There are many new ideas and techniques applied in magnetic separators. So far, dry magnetic separators have developed many different applications for mineral and coal processing, for induction roller magnetic separators for chromite. Cross-belt magnetic separator for removing harmful magnetic particles and paramagnetic particles. The lifting roller magnetic separator is used in the heavy mineral industry to separate garnet from monazite and rutile. Rare earth drum magnetic separator for fine feed dry magnetic separation sorting process and rare earth roller magnetic separator for zircon and rutile in heavy mineral sand industry. These magnetic separators have different applications, and the dry magnetic separator is also moving toward large-scale and easy-to-manufacture.

scholarly journals Analysis of the Effect of Dry Magnetic Separation on the Process of Ferruginous Quartzites Disintegration

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 797
Author(s):  
Darya Nikolaevna Shibaeva ◽  
Alena Arkad’evna Kompanchenko ◽  
Sergey Vasil’evich Tereschenko
Keyword(s):  
Energy Consumption ◽  
Magnetic Separation ◽  
Particle Sizes ◽  
Technological Parameters ◽  
Product Analysis ◽  
Class 1 ◽  
Magnetic Product ◽  
Dry Magnetic Separation ◽  
Separation Product ◽  
Ferruginous Quartzites

The paper considers the results of the application of dry magnetic separation on samples of ferruginous quartzites of the Kostomuksha ore field, represented by refractory ore, free-milling ore, and their mixture. The assessment of the influence of the ore texture on the technological parameters of dry magnetic separation indicates their insignificant changes: the yield of the non-magnetic product varies from 12.4 to 13.5%, and the Fetotal content in the magnetic product increases by 1.11–1.14 times. A decrease of at least 15% in the number of harmful impurities was found: S by 16.2–17.3%, SiO2 by 15.5–21.1%, and Al2O3 by 39.1–48.4%. The authors have performed a comparative assessment of the granularity of the initial ore and the magnetic product with the measurement of energy consumption, as well as an analysis of the magnetite liberation on particle sizes of less than 2 mm. It was found that due to the release of a non-magnetic product in the amount of 12.3–14.5%, represented by non-magnetite or weakly mineralized rock varieties, energy consumption for the crushing process is reduced by at least 5%. The mineral liberation assessment showed that mainly free magnetite is contained in the −0.4 mm fineness class. It was found that in the magnetic separation product of the refractory ore sample, the amount of liberated magnetite in the size class −1 + 0 mm increases by 12.1% compared to the initial ore sample. For the free-milling ore sample, the opposite trend is observed: a decrease in the amount of free magnetite by 30.9% in the magnetic product. Analysis of the magnetite liberation in the mixture indicates deterioration in the results obtained during the separate crushing of refractory and free-milling ore and a decrease in the amount of liberated magnetite in the magnetic product by 60% compared to the initial ore.

Desulphurization of High Sulfur Coal by Mild Pyrolysis Combination with Magnetic Separation

2012 ◽  
Vol 455-456 ◽  
pp. 998-1001
Author(s):  
Quan Run Liu ◽  
Hao Xia ◽  
Guang Xu Huang ◽  
Chuan Xiang Zhang ◽  
Ming Jie Ma ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
The Novel ◽  
Magnetic Separator ◽  
Desulfurization Process ◽  
Dry Magnetic Separation ◽  
Mild Pyrolysis ◽  
Almost All ◽  
Remarkable Reduction

In this work, a new desulfurization process of high sulfur coal was designed and examined. The novel process involved pyrolysis of high sulfur coal at low temperature and then a dry magnetic separation. For testing the cleaning coal process, a Chinese high sulfur coal, Baisu coal was pyrolyzed in a fixed bed reactor from 400 to 700°C for 30min, and then separated by a dry magnetic separator. The results showed that under optimum conditions, a remarkable reduction of sulfur content in coal was achieved, and more importantly, almost all pyrite sulfur in coal was removed.

scholarly journals DRY MAGNETIC SEPARATION OF MAGNETITE ORES

2020 ◽  
Vol 17 (34) ◽  
pp. 700-710
Author(s):  
Kanat Sh CHOKIN ◽  
Abdraman I YEDILBAYEV ◽  
Baimurat A YEDILBAYEV ◽  
Vladimir D YUGAY
Keyword(s):  
Magnetic Separation ◽  
Experimental Studies ◽  
Magnetic Separator ◽  
New Model ◽  
Fine Grained ◽  
Magnetite Ore ◽  
Industrial Grade ◽  
Dry Magnetic Separation ◽  
Industrial Scheme ◽  
Dry Beneficiation

The relevance of the paper is that dry magnetic separation (DMS) is the main beneficiation method of magnetite ores. The lack of efficient industrial-grade machines and apparatus for separating fine-grained magnetite ores means that DMS is used mainly as a pre-concentration operation for fairly large classes. The aim of the research is to study the possibility of using a new magnetic separator model in the process of dry beneficiation of magnetite ore from the Bapy deposit. This paper presents theoretical and experimental studies of a new model of a magnetic separator. The mathematical modeling of the magnetic separation process of the device was carried out to evaluate the parameters in accordance with which a laboratory separator was subsequently manufactured. For the experimental study of the properties of this magnetic system, a laboratory magnetic separator was built. The possibility of using a new magnetic separator in the process of dry beneficiation of magnetite ore from the Bapy deposit was investigated. The industrial scheme being implemented consists in ore crushing and two stage dressing on dry drum magnetic separators. The study of beneficiation indicators of the magnetic separator was carried out using iron ore of the Bapy deposit, which is mono-mineral magnetite. For the study, mixtures of the minus 0.1 mm class were selected with the iron content α = 50% and α = 40%. As a result of the research, beneficiation indicators were obtained on a laboratory scale. Therefore, the improvement of the beneficiation scheme is reduced to the isolation of a small product and its subsequent beneficiation using a new model of magnetic separator. Thus, the presented magnetic separator is suitable for dry processing of crushed magnetite ore.

scholarly journals Studies on Beneficiation of Manganese Ore through High Intensity Magnetic Separator

2020 ◽  
Vol 12 (1) ◽  
pp. 21-27
Author(s):  
Waheed Ur Rehman ◽  
Amin Ur Rehman ◽  
Faridullah Khan ◽  
Amir Muhammad ◽  
Mohammad Younas
Keyword(s):  
Magnetic Separation ◽  
Iron Ore ◽  
Manganese Content ◽  
Operating Conditions ◽  
Magnetic Fraction ◽  
Manganese Ore ◽  
Measurable Effect ◽  
Magnetic Separator ◽  
Maximum Value ◽  
Wet Sieving

Upgradation techniques like wet sieving and magnetic separation were used to evaluate the beneficiation potential of manganese ore. During wet sieving, manganese content in raw ore was upgraded from 27% to a maximum value of 38% in the concentrate with a recovery of 30%. Size classification was found to have no measurable effect on manganese grade in magnetic separation. In the unsieved ground ore, manganese content of 45% was achieved with a recovery of 23% and Mn/Fe ratio of 19% at a magnetic intensity of 8500 Gauss. At the same operating conditions, SiO2 was reduced from 56% in the raw ore to 30% in the magnetic fraction. So, wet sieving technique leads to a comparatively lower manganese grade but better recovery. Conversely, a magnetic separation technique produced higher manganese grade but relatively lower recovery. Blending of the upgraded manganese ore with high grade iron ore can be done to achieve the required Mn/Fe ratio.

scholarly journals Influence of Mineralogy on the Dry Magnetic Separation of Ferruginous Manganese Ore—A Comparative Study

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 150
Author(s):  
Sharath Kumar Bhoja ◽  
Sunil Kumar Tripathy ◽  
Yanamandra Rama Murthy ◽  
Tamal Kanti Ghosh ◽  
C. Raghu Kumar ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Separation Performance ◽  
Gangue Mineral ◽  
Manganese Ore ◽  
Magnetic Separator ◽  
Dry Magnetic Separation ◽  
Mn Recovery ◽  
Optimum Grade ◽  
Iron Bearing ◽  
Iron And Manganese

Magnetic separation is often considered pertinent for manganese ore beneficiation when the ore is abundant with siliceous rich gangue mineral phases. However, the process is deemed to be inapposite for the ferruginous type of ore, and remains a grey area of research. In the present investigation, two different types of manganese ore were studied in detail to understand the influence of mineralogy on their magnetic separation performance. Detailed experiments were performed by varying the critical variables of the dry magnetic separator, and the separation features were studied. The ore samples were thoroughly characterized by various techniques, including an automated advanced mineralogical tool. The mineralogical results revealed that primary manganese bearing minerals in both the ores are rich in cryptomelene, pyrolusite, psilomelane, and bixybyite. Similarly, the major gangue minerals were alumina-bearing minerals and iron-bearing phases (hematite and goethite). The optimum grade that could be obtained from single-stage dry magnetic separation was 35.52% Mn, and with a Mn:Fe ratio of 1.77, and 44% Mn recovery in the case of sample 1; whereas, a 33.75% Mn grade, with a Mn:Fe ratio of 1.66 at Mn recovery of 44% was reported for Sample 2. It was observed that both samples had a similar input chemistry (~28% Mn, ~1 Mn: Fe ratio) however, they had distinctive mineralogical assemblages. Furthermore, it was observed that the liberation of manganese mineral was in a course size range, i.e., 300 to 450 µm, while the association of iron and manganese bearing phases was lower in sample 1 when compared to sample 2.

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