Extraction of Manganese and Iron from a Refractory Coarse Manganese Concentrate

In this research, the coarse manganese concentrate was collected from a manganese ore concentrator in Tongren of China, and the contents of manganese and iron in coarse manganese concentrate were 28.63% and 18.65%, respectively. The majority of the minerals in coarse manganese concentrate occur in rhodochrosite, limonite, quartz, olivine, etc. Calcium chloride, calcium hypochlorite, coke, and coarse manganese concentrate were placed in a roasting furnace to conduct segregation roasting, which resulted in a partial chlorination reaction of iron to produce FeCl3, ferric chloride reduced to metallic iron and adsorbed onto the coke, and rhodochrosite broken down into manganese oxide. Iron was extracted from the roasted ore using low-intensity magnetic separation, and manganese was further extracted from the low-intensity magnetic separation tailings by high-intensity magnetic separation. The test results showed that iron concentrate with an iron grade of 78.63% and iron recovery of 83.60%, and manganese concentrate with a manganese grade of 54.04% and manganese recovery of 94.82% were obtained under the following optimal conditions: roasting temperature of 1273 K, roasting time of 60 min, calcium chloride dosage of 10%, calcium hypochlorite dosage of 5%, coke dosage of 10%, coke size of −1 mm, grinding fineness of −0.06 mm occupying 90%, low-intensity magnetic field intensity of 0.14 T, and high-intensity magnetic field intensity of 0.65 T. Most minerals in the iron concentrate were Fe, Fe3O4, and a small amount of SiO2 and CaSiO3; the main minerals in the manganese were MnO, and a small amount of Fe3O4, SiO2, and CaSiO3. The thermodynamic calculation results are in good agreement with the test results.

Speed-up of simulation of magnetization process for large-scale HTS undulator of X-FEL based on power-law macro-model

The Pure-type HTS undulator is proposed to achieve a high-intensity magnetic field and small size undulator for a compact free-electron laser (FEL). A high precision simulation is required before making the real machine since the sizes and positions are difficult to adjust after the HTSs are magnetized in the cryostat. For this purpose, authors have been developed a numerical simulation code for the magnetization process of HTS undulator of X-FEL based on the power-law macro-model. In this paper, the previously developed simulation code can be speeded up by carefully optimizing the parameters of the power-law macro-model for the 3-HTS magnets model and a large-scale simulation can be performed in an acceptable time by using a multipole expansion for the Biot–Savart law. In addition, for practical applications, the influence of the fluctuation of the magnets thickness and critical current for the electron trajectory are evaluated by using the speed-up simulation code.

ASONIKA-EMC: modeling of electromagnetic processes in electronics designs

The information about the ASONIKA-EMC program, intended for calculating the distribution of electric and magnetic fields intensity inside and outside of the electronic devices housings, as well as for determining the ef¬fectiveness of shielding electric and magnetic fields at effect of the electromagnetic waves in the frequency range 10...30 000 MHz, is adduced. Functional capabilities are described, an example of calculation and analysis of calculation results is adduced. Keywords: radio engineering device; modeling; electric field; magnetic field; electric field intensity; magnetic field strength; shielding.

CHANGE IN THE ACTIVITY OF PENTOXYPLIN UNDER THE ACTION OF A PULSE MAGNETIC FIELD DEPENDING ON THE DRUG COMPOSITION

According to the results of the study, it was found that irradiation of the tabletted preparation of pentoxifylline leads to an increase in its antiaggregatory activity. The aim of this work is to study the effect of a pulsed magnetic field of high intensity on the antiaggregatory activity of the pure substance of petoxifylline. When exposed to a pulsed magnetic field on the pure substance of pentoxifylline (without the presence of excipients), changes in the antiaggregatory activity of the drug were not detected. Irradiation with a pulsed magnetic field was carried out on an MIU-15 setup at various magnetic field strengths with single-turn and multi-turn inductors with the number of pulses n = 1. The authors put forward a hypothesis that excipients in a tabletted medicinal product affect the change in biological activity after exposure to the drug by a pulsed magnetic field of high intensity. The study of the pure substance of pentoxifylline for antiaggregatory activity was carried out on an AT-02 platelet aggregation analyzer. Control samples of the medicinal product were not exposed to the magnetic field. It is assumed that the presence of excipients in the tablet form of pentoxifylline after exposure to a pulsed magnetic field can cause a change in the conformation of the drug molecule. In addition, a transition from one conformation to another is possible due to abrupt changes in properties, i.e. when exposed to a high-intensity magnetic field. An antiplatelet agent with excipients, being in a magnetic field, goes into a more active state, after which it retains it for some time, in which an increase in pharmacological activity is manifested.

DC radial glow discharge in axial magnetic field at low pressures

The influence of magnetic field on DC radial glow plasma was studied by self-designed coaxial glow discharge device, and the influence of magnetic field on the spatial distribution of plasma density is studied. The experimental results show that the spatial density distribution of plasma from cathode to anode increases gradually in the high-intensity magnetic field, and decreases gradually in the absence of magnetic field. Theoretical analysis of the above results show that the high-intensity magnetic field increases the moving path of the electrons, enhances the collision efficiency between the electrons and the neutral atoms, and makes the discharge plasma density remarkably enhanced.

PEMODELAN DUA DIMENSI MENGGUNAKAN RESIDUAL ANOMALI MAGNETIK LOKASI SAINS CENTER DI DESA OELNASI, KECAMATAN KUPANG TENGAH, KABUPATEN KUPANG

ABSTRAK Telah dilakukan penelitian dengan metode geomagnet pada lokasi Sains Center di Desa Oelnasi, Kecamatan Kupang Tengah, Kabupaten Kupang. Penelitian ini bertujuan untuk menginterpretasi kondisi bawah permukaan lokasi pembangunan gedung Sains Center dan memetakan pola perlapisan batuan bawah permukaan di lokasi penelitian. Pengambilan data dilakukan pada 192 titik ukur dengan luas lokasi ± 50 Ha. Proses akusisi data dengan sistem looping menggunakan alat Proton Prosession Magnetometer (PPM) tipe GSM-19T. Hasil penelitian menunjukkan sebaran nilai intensitas medan magnetik total dari 45255.85 nT sampai 45517.70 nT. Untuk anomali hasil pengolahan data diperoleh pada kisaran -90 nT sampai 190 nT. Hasil pemodelan 2 dimensi menunjukkan bahwa lokasi penelitian didominasi oleh batuan gamping dengan kisaran nilai suseptibilitas 0,000002 cgs unit sampai 0,002778 cgs unit dan berada pada kedalaman ±0 meter – 20 meter dan batuan diamagnetik dengan kisaran nilai suseptibilitas -0,000013 cgs unit sampai -0,000840 cgs unit pada kedalaman ± 5 meter – 20 meter. Kata kunci: Geomagnet, Suseptibilitas, Sains Center, Batuan gamping, Batuan diamagnetik. ABSTRACT A research has been done with used geomagnetic method in located science centre of oelnasi village subdistric kupang centre, kupang regency. This research purposes for interpretation under surface condition site the building of science centre and mapped pattern rock layered under surface in the location research. Acquire data to do in 192 drop measure with wide located ± 50 hectare. The acquire process with looping system make use of Proton Prosession Magnetometer (PPM) type GSM-19T. Output research showed value spread total intensity magnetic field as of 45255,85 nT to 45517,70 nT. For output anomaly data processing get to turn -90 nT to 190 nT. Two dimantion output modeling showed that in the location research predominance of limestones rock with the susceptibility value 0,000002 cgs unit to 0,002778 cgs unit and be in the depth ±0 meters – 20 meters, and diamagnetic rock with the susceptibility value -0,000013 cgs unit to 0,000840 cgs unit be in the depth ±5 meters – 20 meters. Keywords : Geomagnetic, Susceptibility, Science Centre, Limestone Rock, Diamagnetic Rock.