Temat: ore - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The influence of the degree of iron-ore enrichment on it’s metallization parameters
Autorzy:: Amdur, A. M.
Pelevin, A. E.
Purevsuren, B.
Munkhtuul, L.
Raznitsina, A. L.
Tematy:: Fe
iron ore
coal
magnetite ore
production of superconcentrate
enrichment of ore; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/411734.pdf Link otwiera się w nowym oknie
Opis:: Have been developed a scheme of enrichment (benification) of magnetite iron-ore concentrates with total content of Fet = 31 % in ore at magnetic separator and obtained a superconcentrate with Fet = 69,50 %. Experimentally determined that the reduction reaction degree of Fe by coal increases linearly with increasing of the content of Fe in concentrate. Certainly it has positive influence of decreasing the content of more difficult for reduction and poor magnetic iron containing components in the processing of wet magnetic separation (WMS). Almost all iron are in the form of good to reduce magnetite in the superconcentrates and enrichment of concentrate accompanying with growth of specific surface.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Investigating the effectiveness of organic binders as an alternative to bentonite in the pelletization of low grade iron ore
Autorzy:: Tafadzwa, Ngara
Mavengere, Shielah
Bright, Sharrydon
Mapamba, Liberty
Tematy:: bentonite
iron ore
low grade ore
organic binder
pelletization
pellet evaluation
refractory ore; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/27323655.pdf Link otwiera się w nowym oknie
Opis:: Bentonite is the traditionally used binder in iron ore pelletization. However, it consists of up to 85% silica and alumina which are undesired acidic gangue in iron-making. In this study, carboxymethyl cellulose, sodium lignosulfonate and cornstarch were used as acidic gangue-free organic alternatives to bentonite in synthesizing iron pellets. Iron ore, water and the corresponding binder were mixed and rolled in a pelletizing disk to form green pellets. The green pellets were dried and subsequently indurated in a furnace at 1200 ℃ to form indurated pellets. To evaluate the effectiveness of the organic binders, the pellets produced were tested on various pellet properties. Known industrial pellet property standards and the bentonite binder were used as references. Carboxymethyl cellulose, sodium lignosulfonate and corn starch produced green pellets with average drop numbers of 7.20 ± 0.84, 5.60 ± 0.89 and 6.00 ± 1.00 respectively, compared to bentonite’s 5.00 ± 0.71. Dry pellets of average compressive strength 5.93 ± 0.09, 5.86 ± 0.03 and 11.52 ± 0.18 kg/pellet were produced by carboxymethyl cellulose, sodium lignosulfonate and corn starch respectively while bentonite’s averaged 5.60 ± 0.08 kg/pellet. For indurated pellets, carboxymethyl cellulose (210.2 ± 1.88 kg/pellet) and sodium lignosulfonate (198.1 ± 2.49 kg/pellet) pellets were weaker than those of bentonite (250.4 ± 2.06 kg/pellet) but satisfied the industrial requirement of 181.4 kg/pellet. A boron oxide additive (0.1 wt. %) was used to boost the strength of carboxymethyl cellulose indurated pellets to 252.6 ± 1.32 kg/pellet, rendering them superior to those of bentonite.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Water chemical composition characteristic in the upper part of the Sztoła River
Autorzy:: Juśko, K.
Kasprzak, A.
Pietrzak, D.
Tematy:: zinc ore mining
lead ore mining
sand extraction; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/184148.pdf Link otwiera się w nowym oknie
Opis:: The Sztoła River crosses Lesser Poland and Silesia voivodships in the region of Olkusz zinc and lead ores mining and sands extraction. It is one of the left-bank tributary of Biała Przemsza. Its sources are located southwest of Olkusz. In the geological structure of Sztoła water catchment area, on the basis of conducted drillings, the following deposits can be distinguished: Paleozoic, represented by Permian deposits, Mezozoic-Triassic deposits, and Cenozoic-Quaternary deposits (Buła 2000, Motyka 2010). Hydrodynamic conditions in the region of Sztoła have been strongly interrupted by the development of zinc and lead ores mining and a sand pit, which required an application of drainage. The first system of drainage was adits built in 16 th century, which resulted in a decrease of the groundwater table level from few to over a dozen meters (Żukowski 1946, Górnisiewicz 1975, Molenda 1977, Kosiński 1882). The intensive development of mining in this region began in the first half of 19 th century, along with appearance of new drainage techniques. The Sztoła River changed its character from draining to infiltrating on its the whole length as the effect of development of vast zinc and lead ores mine depression cone, related to the exploitation of the „Pomorzany” mine, and later with a gravitational drainage of sandpit „Szczakowa” (Witczak & Motyka 1975, Haładus et al. 2007). In the upper part of the river it resulted with a partial dry out of the riverbed. Water flowing in the river originated from the drainage of Olkusz zinc and lead ores mines and is directed there through Baba channel. A research conducted in the summer of 2014 examined the upper part of the Sztoła River. Groundwater taken from springs, as well as surface water, was collected, and the areas of critical riverbed dry out were identified. A complete physicochemical analysis was carried out in the AGH hydrogeochemical laboratory in Cracow. On the basis of the received data, the characteristics of chemical composition of groundwater and surface water were prepared. Their hydrochemical type, pH values, electrolytical conductivity was determined. Chemical composition was also presented in the selected graphical forms (Piper, Collins, Pie Chart). Based on analysis, the statistical parameters of composition of water from the research region were calculated. Furthermore, the quality of underground and surface water was evaluated according to the existing standards, and suitability to consumption by people was determined. The Obtained data were also compared with archival results of samples collected within the investigated area.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Characterization and beneficiation of iranian low-grade manganese ore
Autorzy:: Mehdilo, A.
Irannajad, M.
Hojjati-Rad, M. R.
Tematy:: pyrolusite
manganese ore
ore characterization
gravity separation
magnetic separation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110939.pdf Link otwiera się w nowym oknie
Opis:: The mineralogical studies indicated that the Charagah ore deposit contains approximately 17% pyrolusite, 78% calcite and 3–4% quartz. Pyrolusite as a main valuable mineral is found in the forms of coarse and fine pyrolusites. The coarse grains pyrolusite with simple texture is liberated at 180 micrometers. Another kind of pyrolusite with particle size finer than 10 m is disseminated inside gangue phases. This kind of pyrolusite has important effect in beneficiation processes and can affect the manganese grade of the concentrate and its recovery negatively. By jigging machine a pre-concentrate with 20% MnO and a final tailing with about 13% manganese loss are obtained. Using tabling technique or wet high intensity magnetic separation (WHIMS) and also their combination with jigging machine, production of a final pyrolusite concentrate with suitable grade but average recovery is possible. By jigging-tabling a concentrate with – 500+45 m size fraction, 44.3% MnO and 61.3% recovery is obtained while jigging-WHIMS produces a concentrate containing 52.6% MnO with a recovery up to 56.6% and d80 = 180 m.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Management of Scraper-Self-Propelled ore delivery parameters in caving operations
Autorzy:: Kosenko, Andrii
Khomenko, Oleh
Kononenko, Maxim
Yegorchenko, Rostyslav
Starikov, Grygorii
Dychkovskyi, Roman
Tematy:: ore drawing and delivery
actual mining
ore drawing intensity
ore delivery methods
self-propelled loading and hauling machine
capital ore pass
maszyny górnicze
zarządzanie
rudy; Pokaż więcej
Wydawca:: Instytut Techniki Górniczej KOMAG
Powiązania:: https://bibliotekanauki.pl/articles/58906801.pdf Link otwiera się w nowym oknie
Opis:: This paper analyzes ore delivery methods suitable for the deep-level mining environments of the Kryvbas region. The study focuses on the feasibility and economic advantages of utilizing a combined scraper-self-propelled ore delivery system within sublevel caving operations. Through comprehensive analysis, it is found that the integration of self-propelled equipment significantly enhances the efficiency and cost-effectiveness of ore transport. The proposed delivery method involves using multi-bucket scraper winches for primary ore movement and deploying a self-propelled load-haul-dump (LHD) machine for secondary transport. Economic and mathematical modeling results demonstrate that this combined approach enables optimization of operational parameters, identifying the most effective application ranges for different types of self-propelled LHDs in secondary ore transport. Specifically, the study highlights that the ST7 model of self-propelled LHD is the most cost-effective solution for secondary transport, minimizing specific delivery costs while maintaining productivity. Additionally, the findings provide practical guidance on the optimal usage limits for various self-propelled LHD types, helping to inform equipment selection for enhanced operational efficiency in caving systems. These insights contribute to improved decision-making in mining operations, promoting both economic and technical benefits in high-depth mining scenarios.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Application of a biconical dense medium cyclone to pre-treat a low-grade Pb-Zn sulfide ore
Autorzy:: Jian, Sheng
Sun, Wei
Zheng, Yong-xing
Tematy:: Pb-Zn sulfide ore
Low-grade ore
Pretreatment
Biconical dense medium cyclone; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110536.pdf Link otwiera się w nowym oknie
Opis:: A biconical dense medium cyclone (BDMC) was applied to reject the gangue from a low-grade Pb-Zn sulfide ore for the first time. Based on mineralogy and heavy liquid separation tests, it was found that the rejection of gangue by the BDMC prior to grinding and flotation was promising. The results revealed that the particle size clearly affected the heavy liquid separation process. The effects of several parameters, such as medium specific gravity (SG), spigot diameter, tilt angle, cone angle and medium/ore mass ratio, on the yield of floats and on the metal recoveries in the floats were examined and the optimal parameters were determined. The results showed that 51.22% of floats were obtained with a lead recovery of 7.92% and a zinc recovery of 12.50%. The extended tests were further carried out with the BDMC being capable of throughputs about 3 t/h, which verified the results obtained in the laboratory experiments. The use of this equipment to pre-treat the refractory ore is promising.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical investigation of the impact of various parameters on blowing accuracy in the XRT intelligent ore sorting machine blowing process
Autorzy:: Fan, Jiayu
Rao, Yuhuan
Liu, Sidong
Yu, Xinyang
Tematy:: intelligent sorting machine
pre-selection for waste
ore blasting
ore stresses
numerical simulation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/58971027.pdf Link otwiera się w nowym oknie
Opis:: XRT separation equipment is attracting much attention as the mining industry increasingly uses pre-sorting technology. Its sorting accuracy is affected by differences in ore shape and particle size during operation. This paper, in which numerical simulations are conducted to investigate the resistance of ores under various situations, including varying blowing distances, cross-sections, and practical sizes, Additionally, this paper conducts validation tests. The test results indicate that within the 0.1-0.25 m section from the nozzle exit, there is a rapid decrease in velocity, accompanied by a significant change in ore resistance. Beyond the 0.25 m mark, the velocity reduction slows down, while the ore resistance becomes smaller. There exists a notable disparity in the resistance of ores with varying cross-sectional geometries. The size of the jet velocity surface caused by blowing distance significantly influences the resistance of ore with varying particle sizes. Furthermore, the resistance of the ore remains constant subsequent to the impact surface of the ore surpassing the surface of the jet velocity. Consequently, appropriately modifying the blowing distance, inlet pressure, and jet speed in accordance with the cross-sectional area and particle size of the majority of the ores stream can enhance the precision of the sorting process.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Smart ore tracking system using soft sensor technology
Inteligentny system „śledzenia” rudy za pomocą technologii sensorowej
Autorzy:: Pan, X.
Tematy:: śledzenie rudy
monitoring typu rudy
pomiar procesu
sensor
ore tracking
ore type soft sensor
ore type monitoring
process modeling
process measurement
soft sensor; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/348555.pdf Link otwiera się w nowym oknie
Opis:: The relationship between ore mineralogy and downstream processing is well known in the mining industry. In fact, the very definition of a mineral deposit as an ore body depends on its susceptibility to processing in an economical manner. With an ore tracking system, the information about each ore block, gained during exploration and mining, could be used as input data to the mineral processing operation. This would allow the real-time optimization and control of the ore processing. A smart ore tracking system can be developed by using soft sensor technique. The ore tracking system utilizes the real time information available in both SCADA and database of a mine. Using the ore geological data and the tonnage of ore being treated, the ore tracking system calculates and provides ore type information such as ore mixing percentage, ore grade and ore hardness and density. The ore type information provided by the ore tracking system can be made available at all process units at a mine, including primary crusher, primary stock pile, primary scrubbers, secondary scrubbers, secondary crushers, re-crusher stock pile, dense media separation stock piles, dense media separation feeders, and the feed to next processing plant. The smart ore tracking system, developed originally for a diamond mine, can be used for other mines, such as iron ore, coal, chromite ore, manganese ore, etc.
Zależność pomiędzy mineralogią rudy a przeróbką jest bardzo dobrze znana w przemyśle górniczym. W rzeczywistości, definicja złoża mineralnego jako rudy zależy od jego podatności na procesy przeróbcze z punktu widzenia ekonomii. Przy zastosowaniu systemu "śledzenia" rudy informacja o każdym bloku rudy jest uzyskiwana podczas procesu wydobycia i obróbki górniczej. Może być ona zastosowana jako dane wejściowe do operacji przeróbki surowców mineralnych. Pozwoli to na optymalizację w czasie rzeczywistym i kontrolę procesów przeróbczych. Inteligentny system "śledzenia" rudy można uzyskać za pomocą techniki sensorowej. System ten korzysta z informacji w czasie rzeczywistym dostępnych zarówno w SCADA jak i bazie danych kopalni. Przy zastosowaniu danych geologicznych i informacji na temat ilości przerabianej rudy system oblicza i przewiduje informacje nt. rudy, tj. procent mieszania rudy, stopień rozdrobnienia, twardość, czy gęstość. Informacje te mogą stanowić bazę dla każdego procesu przeróbczego w kopalni, wliczając pierwsze kruszenie, pierwsze składowanie, pierwsze sortowanie, drugie kruszenie, drugie sortowanie, powtórne kruszenie, rozdział w cieczach ciężkich itp. System "śledzenia" rudy, wynaleziony pierwotnie dla kopalni diamentów może zostać zastosowany w innych kopalniach, tj. kopalnia żelaza, węgla, chromu, manganu itp.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A geological interpretation of geophysical self-potential anomalies in the Radzimowice Ore District, Sudetes, South-Western Poland
Autorzy:: Sobotka, J.
Farbisz-Michałek, M.
Tematy:: Radzimowice ore district
self-potential method
SP anomalies
graphite body
prospecting of ore deposits; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/184543.pdf Link otwiera się w nowym oknie
Opis:: The analysis of the geophysical surveys results carried out in the Radzimowice area reveals that the anomalous zones of significant SP (self-potential) anomalies of natural SP fields do not substantially find a reflection in existing geological papers. Confrontation of existing geological elaborations with the results of SP analysis shows that the selfpotential studies expose significant elements of geological setting – i.e. run of faults, lithological boundaries, occurrence of ore mineralization – which can be helpful in clarifying the geological setting of the area. In the study, archived self-potential data were used and additionally new SP measurements were executed to justify their treatment as a valuable source of information.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Geochemistry indices and biotests as useful tools in the assessment of the degree of sediment contamination by metals
Autorzy:: Koniarz, Tomasz
Tarnawski, Marek
Baran, Agnieszka
Tematy:: metals
bottom sediments
zinc ore mining area
lead ore mining area
ecotoxicity
risk assessment; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/2202856.pdf Link otwiera się w nowym oknie
Opis:: Ecological and geochemical indicators have been widely accepted as tools with the potential for rapid risk assessment of metal contamination of bottom sediments. In this study we propose a selection of such indicators to characterize the potential ecological risks stemming from metal contamination of the bottom sediments of the Chechło reservoir (S Poland). The Chechło reservoir is located in an area formerly occupied by zinc and lead ore mining and processing industry. High amounts of metals, especially zinc (39.37–4772.00 mg/kg d.m.), cadmium (0.37–21.13 mg/kg d.m.) and lead (4.50–434.49 mg/kg d.m.) have been found in the bottom sediments. Both geochemical (CD – contamination degree) and ecological indices (mean PECQ) were indicative of bottom sediment contamination and their potential toxicity to living organisms. Most of the bottom sediment samples (71%) examined were toxic for Heterocypris incongruens, while only 9% of the samples were toxic to Sinapis alba. However, no significant correlations between the metal content and the response of the test organisms were observed. Correlation and principal component analyses (PCA) showed that silt and clay fractions were the key factors influencing the metal content in the sediments. Our study makes a contribution to building evidence of the need to integrate several indices for the assessment of environmental risks related to the presence of metals in bottom sediments rather than relying on a single one.
Dostawca treści:: Biblioteka Nauki

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