scholarly journals Operational lifetime increase of the pumping equipment when pumping-out contaminated groundwater

2021 ◽  
Vol 15 (1) ◽  
pp. 42-49
Author(s):  
Mykola Biloshytskyi ◽  
Halyna Tatarchenko ◽  
Nataliia Biloshytska ◽  
Pavlo Uvarov
Keyword(s):  
Barium Ferrite ◽  
Iron Ore ◽  
Permanent Magnets ◽  
Contaminated Groundwater ◽  
Ferrite Powder ◽  
Abrasive Particles ◽  
Operational Lifetime ◽  
Spherical Elements ◽  
Weakly Magnetic ◽  
Pumping Equipment

Purpose. Solving the problem of increasing the pumping equipment operational lifetime when pumping-out contaminated groundwater in the iron-ore industry by extracting the hard, abrasive part, using magnetic filters based on permanent ferrite magnets. Methods. To produce spherical hard-magnetic ferrite elements that catch finely-dispersed magnetic and weakly-magnetic abrasive particles when pumping-out contaminated groundwater in the iron-ore industry, barium ferrite powder BaО∙6Fe2O3 is applied, which is usually used for obtaining hard-magnetic ferrites. Spherical elements for filling a magnetic filtering installation are obtained by the method of spheroidizing the barium ferrite powder in a dragee machine. Sintering of spherical granules obtained from barium ferrite powder is conducted in a high-temperature atmospheric electric box furnace. The sintered spherical elements made of hard-magnetic barium ferrite are magnetized using a magnetic pulsed toroidal-shaped setup in a pulsed constant magnetic field. Findings. For continuous pumping-out and purification of contaminated groundwater from magnetic, weakly-magnetic and non-magnetic highly abrasive particles with the help of magnetic filters, a scheme of a filtering installation of two sections is pro-posed. A technology for producing spherical permanent magnets from barium ferrite powder has been developed for a filtering installation, which includes a coarse purification column with hollow-spherical permanent magnets of 16-17 mm in diameter and a fine purification column with full-bodied spherical barium ferrite magnets of 6-7 mm in diameter. Originality.The term of pumping equipment operation is doubled if to eliminate abrasive wear due to the filtering two-section installation by filling with barium ferrite spherical magnets. In the case of changing the filter, idle time is reduced by using the supplementary auxiliary column. The possibility of processing filtration products and their use in the field of construction and metallurgy without environmental pollution is substantiated. Practical implications. The scheme of magnetic groundwater purification in the iron-ore industry is proposed, consisting of a filtering column of coarse and fine purification from abrasive particles. A technology for producing spherical magnets with different diameters has been developed to ensure the quality of the process. The research results allow to increase the operational lifetime of pumping equipment by eliminating abrasive wear, which will lead to significant savings in the replacement and repair of centrifugal pumps. Keywords: pumping equipment, groundwater, wear, barium ferrite, spherical magnet, filter, iron-ore industry

EFFECT OF MILLING METHODS ON BARIUM FERRITE POWDER FOR THE PRODUCTION OF PERMANENT MAGNETS

1966 ◽  
Vol 9 (18) ◽  
pp. 151-162 ◽  
Author(s):  
TH. MAURER ◽  
H. G. RICHTER
Keyword(s):  
Barium Ferrite ◽  
Permanent Magnets ◽  
Ferrite Powder

Structural, surface morphology and radiation shielding properties of barium ferrite powder

2021 ◽  
Author(s):  
Atif Mossad Ali ◽  
Shams A M Issa ◽  
H Algarni ◽  
Huseyin Ozan O. Tekin ◽  
Hesham M.H. Zakaly ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Barium Ferrite ◽  
Radiation Shielding ◽  
Ferrite Powder ◽  
Structural Surface ◽  
Shielding Properties

An ultrafine barium ferrite powder of high coercivity from water-in-oil microemulsion

1998 ◽  
Vol 184 (3) ◽  
pp. 344-354 ◽  
Author(s):  
Xiangyuan Liu ◽  
John Wang ◽  
Leong-Ming Gan ◽  
Sen-Choon Ng ◽  
Jun Ding
Keyword(s):  
Barium Ferrite ◽  
High Coercivity ◽  
Ferrite Powder

The effect of magnetic dilution of the magnetization reversal of coprecipitated barium ferrite powder

1986 ◽  
Vol 22 (5) ◽  
pp. 987-989 ◽  
Author(s):  
P. Grohs ◽  
K. Hempel ◽  
K. Kuse
Keyword(s):  
Magnetization Reversal ◽  
Barium Ferrite ◽  
Ferrite Powder ◽  
Magnetic Dilution

A Spinner Magnetometer for Susceptibility Anisotropy in Rocks

1975 ◽  
Vol 12 (8) ◽  
pp. 1448-1464 ◽  
Author(s):  
P. C. Boetzkes ◽  
D. I. Gough
Keyword(s):  
Permanent Magnets ◽  
Magnetic Circuit ◽  
Air Gap ◽  
Johnson Noise ◽  
High Precision Measurement ◽  
Specimen Holder ◽  
A Value ◽  
Bulk Susceptibility ◽  
Weakly Magnetic ◽  
Nyquist Noise

The study of rock fabric through the anisotropy of magnetic susceptibility requires instruments capable of high-precision measurement of weakly magnetic sedimentary rocks. The magnetometer here described is such an instrument. The rock specimen spins on a shaft in an air-gap in a closed magnetic circuit of permalloy with barium ferrite permanent magnets. The air-gap is designed to apply to the rotating specimen a very uniform flux density with a value of 0.115 tesla when the magnets are saturated. Magnetizing coils integral to the transducer are used to magnetize or demagnetize the permanent magnets. Coils in the specimen gap detect specimen magnetization parallel and perpendicular to the applied field. The magnetic circuit forms a balanced bridge and allows alternative modes of transduction. The design is such that Nyquist noise is the largest noise contributed by the magnetic circuit and is smaller than the Johnson noise from the detector coils. Measured noise from the completed transducer is only 4.7 dB above the Johnson noise. The limiting sensitivity is, however, set by the time variation of anisotropy signal from the shaft and empty specimen holder. This limit is at 1.5 × 10−9 mksu (1.2 × 10−10 emu/cm3), so that relative anisotropy of 0.01% can be detected in a weakly magnetic sandstone of bulk susceptibility 1.5 × 10−5 mksu. Calibration is discussed and sample measurements are presented. Construction of the transducer required solution of many technological problems, of which the greatest was encapsulation to suppress all vibration of parts without strain-induced loss of permeability of the permalloy. The more important of the solutions found are outlined briefly.

Magnetic Ink Based on Barium Ferrite and its Application in Magnetic Recording Paper

2015 ◽  
Vol 748 ◽  
pp. 85-88 ◽  
Author(s):  
Ya Ling Li ◽  
Fu Yan Zhao ◽  
Jun Xia Zhao ◽  
Lu Hai Li
Keyword(s):  
Magnetic Recording ◽  
Barium Ferrite ◽  
Magnetic Layer ◽  
Credit Cards ◽  
Ferrite Powder ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
Paper Substrate ◽  
X Ray ◽  
Identity Cards

Magnetic stripe cards and magnetic recording paper are commonly used in credit cards, identity cards, and transportation tickets. Barium ferrite was used to prepare magnetic inks and the magnetic ink was coated onto the paper substrate to obtain the magnetic papers. The crystal structure of barium ferrite was characterized by X-ray diffraction (XRD) and the magnetic property of barium ferrite was tested by vibrating sample magnetometer (VSM) The performance of the magnetic recording paper and the surface morphology of the coating magnetic layer were also characterized. The results show that the magnetic ink based on barium ferrite with the formula of 41wt% of the barium ferrite powder, 14wt% of polyurethane, 36wt% of solvent and 9wt% of PVP has good printing characteristics and the magnetic recording papers have good performance.

Preparation of high‐coercivity fine barium ferrite powder

1994 ◽  
Vol 76 (10) ◽  
pp. 6065-6067 ◽  
Author(s):  
W. A. Kaczmarek ◽  
B. W. Ninham
Keyword(s):  
Barium Ferrite ◽  
High Coercivity ◽  
Ferrite Powder

scholarly journals Integrated study on obtaining oxide pellets from brown iron ore

2021 ◽  
Vol 1 (7) ◽  
pp. 55-68
Author(s):  
Iurii N. Lopatin ◽  
◽  
Anton A. Mushketov ◽  
Elena G. Dmitrieva ◽  
◽  
...  
Keyword(s):  
Mass Fraction ◽  
Iron Ore ◽  
Raw Materials ◽  
Mineral Concentration ◽  
Separation Processes ◽  
Iron And Steel ◽  
Iron Concentrate ◽  
Oxidized Pellets ◽  
Weakly Magnetic ◽  
Magnetizing Roasting

Introduction. Currently, the main raw materials for the production of cast iron and steel at metallurgical plants are iron concentrates obtained from magnetite (ferrous) quartzites, titanium-magnetite, and skarn ores. The existing technologies for processing these types of ores, which mainly include separation processes based on magnetic properties, size, separating of equally falling grains, and surface wettability allow us to produce both ordinary iron concentrates and high quality ones. The use of such schemes in the processing of brown iron ore does not allow obtaining high rates of mineral concentration. One of the methods for processing this type of ore is a roasting-magnetic scheme, which allows converting weakly magnetic (non-magnetic) forms of iron into strongly magnetic ones. Research objective is to develop the mode of magnetizing roasting of brown iron ore, technology of concentrating of the burn-out product in order to obtain iron concentrate and oxide pellets. Methods of research. The duration of heat treatment of the charge consisting of iron ore from the Abail deposit and coal from the Ekibastuz deposit and the required mass fraction of solid carbon contained in the coal are determined. Technological studies of the roasted product were carried out in order to obtain a concentrate with a mass fraction of iron at least 67%. According to the developed technology, a batch of iron concentrate was developed in order to obtain and study raw and oxide pellets. Results. The modes of magnetizing roasting of brown iron ore from the Abail deposit and cooling of the roasted material have been developed. A scheme for mineral processing of the roasted material has been developed in order to obtain a concentrate with at least 67% of iron mass fraction. The process of obtaining strong raw and roasted pellets from iron concentrate is studied. Conclusions. The developed mode of magnetizing roasting of the charge consisting of coal and ore from the Abail deposit makes it possible to obtain a roasted product with a degree of magnetization of 93%. The using of desliming of the roasted product makes it possible to remove magnetic floccules from the processing that reduce the concentrate quality, and to obtain a concentrate with a mass fraction of iron of at least 67% in the last stage of magnetic separation. From the iron concentrate, it is possible to obtain oxidized pellets with a strength of at least 200 kg/pellet at temperature of pellets firing of 1325 °C.

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