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Wyszukujesz frazę "low grade ore" wg kryterium: Temat


Wyświetlanie 1-7 z 7
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
Powiązania:
https://bibliotekanauki.pl/articles/110536.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Pb-Zn sulfide ore
Low-grade ore
Pretreatment
Biconical dense medium cyclone
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.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 4; 981-990
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Powiązania:
https://bibliotekanauki.pl/articles/27323655.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bentonite
iron ore
low grade ore
organic binder
pelletization
pellet evaluation
refractory ore
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.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 176094
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of uranium recovery from low-grade ore by bioleaching and acid leaching
Autorzy:
Szolucha, M. M.
Chmielewski, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/109808.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bioleaching
acid leaching
column leaching
low-grade ore
uranium
recovery
shrinking core model
Opis:
The objective of this work was to compare the bioleaching with the acid leaching of uranium under similar process conditions within 65 days. The low-grade uranium ore used in the experiments was collected from Radoniow’s ‘small’ dump, Poland. Bioleaching and acid leaching studies were carried out in identical columns. The isolated bacterial consortium from the Radoniow’s mine was used for the bioleaching process. A solution of sulphuric acid and H2O2 as oxidizing agent was used for the acid leaching. The extraction of uranium under acid leaching conditions reached maximum of 64±13 % w/w after 31 days. The bioleaching of uranium achieved a maximum extraction of 75±15 % w/w after 55 days. In this study an attempt was made to demonstrate the relationship between the shrinking-core model and the experimental data by plotting the fractional conversion of uranium against time.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 136-149
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of nickel and iron from low–grade laterite ore and red mud using co–reduction roasting: Industrial-scale test
Autorzy:
Guo, Xiaoshuang
Xu, Chengyan
Wang, Yingshuo
Li, Xiaohui
Sun, Tichang
Powiązania:
https://bibliotekanauki.pl/articles/1447175.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
co-reduction
low-grade laterite ore
red mud
rotary kiln
powdered ferronicke
Opis:
In this study, the effects of red mud (RM) dosage during the co-reduction roasting of lowgrade laterite ore and RM were investigated. The expanded test was conducted under the following optimized conditions: RM-1 dosage of 15 wt%, anthracite dosage of 13 wt%, a roasting temperature of 1300oC, and roasting time of 3 h. Ferronickel powder was obtained with a nickel grade of 1.95 wt%, iron grade of 83.25 wt%, and nickel and total iron recoveries of 94.71 wt% and 95.98 wt%, respectively. The addition of RM improved the recovery of nickel and total iron in ferronickel powder. The reason was because of the increased intensity of the diffraction peaks of kamacite and iron, and the ferronickel particles grown due to the liquid phase were easier to achieve at a lower melting point. The industrialscale test results showed that ferronickel powder was obtained with average nickel and total iron grades of 1.76 wt% and 86.46 wt%, respectively, which indicated the successful industrial-scale test of co–reduction roasting. Thermodynamic analysis theoretically illustrated the feasibility of the co–reduction of low-grade laterite ore and RM. Increased roasting temperature promoted the reduction of iron oxide and nickel oxide.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 3; 61-72
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on separation of low-grade zinc oxide ore with sulfurization-amination flotation
Autorzy:
Feng, Dongxia
Bai, Lin
Xie, Haiyun
Tong, Xiong
Powiązania:
https://bibliotekanauki.pl/articles/109605.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
low-grade zinc oxide ore
sulfurization-amination flotation
grinding fineness
Opis:
With the continuous depletion of a large number of zinc sulphide ores that are easy to treat, the finely disseminated and refractory low-grade zinc oxide ores has become an important source for the production of zinc minerals. In this paper, a sulfurization-amination flotation process has been proposed for concentrating large amounts of low-grade zinc oxide ore in Lanping, Yunnan Province. Spectrum analysis, chemical analysis and element analysis was performed to provide research basis for process design and operational control. The main influencing factors during the process, including grinding fineness, reagent types and dosage, etc., have been studied through flotation tests. The results showed that the optimum grinding fineness was -0.074 mm accounting for 89.78% for the target run-of mine ore. Moreover, optimum dosages of sodium carbonate, sodium silicate, sodium hexametaphosphate, sodium sulphide and octadecylamine were determined as 1500 g/t, 500 g/t, 200g/t, 8000 g/t and 500 g/t, respectively. Under these conditions, an open circuit test and a closed circuit test with one stage rougher, two stage scavenger and three stage cleaner flotation were carried out with the run-of-mine ore with a zinc grade of 6.52% and the oxidation ratio of 94.62%. The zinc concentrate can be obtained with zinc grade of 44.09% at a zinc recovery of 66.35% with a 9.70% yield of zinc concentrate yield. The results confirmed the validity and practicability of the proposed process design and experimental operation. This study is of special value as it provides referencing significance for economically exploiting low-grade zinc oxide ore.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1082-1090
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comminution behavior and mineral liberation characteristics of low-grade hematite ore in high pressure grinding roll
Autorzy:
Cao, Jincheng
Liu, Lei
Han, Yuexin
Feng, Ansheng
Powiązania:
https://bibliotekanauki.pl/articles/110727.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
low-grade hematite ore
high pressure grinding roll
comminution behavior
degree of liberation
Opis:
The comminution process and mechanism of low-grade hematite ore in a high pressure grinding roll (HPGR) were investigated in this work. Three different methods were used for comminution of the hematite ore: HPGR with an air classifier, HPGR with screening followed by ball milling (HPGR+BM), and cone crushing with screening followed by ball milling (CC+BM). In addition, the effects of comminution methods on the degree of liberation of minerals in the grinding products were compared. The results suggest that the comminution process of the ore can be divided into four stages: appearance of tiny cracks, expansion of tiny cracks, which eventually form microcosmic cracks, development of principle cracks, and generation of the conjugate fracturing zone. Intergranular cracks, including partial intergranular cracks and complete intergranular cracks, are apparent in the comminution products of the HPGR. The complete intergranular cracks mainly occur in the conjugate fracturing zone, while the partial intergranular cracks within the particles result in an abundance of locked-particles in the comminution products. Furthermore, the degree of liberation of minerals is more influenced by the final grinding mode rather than the crushing method. It is found that complete intergranular cracks in the conjugate fracturing zone play a significant role in increasing the degree of liberation of iron minerals in the fine size fraction. The “mosaic-type” locked-particles have negligible effect on the liberation properties of iron minerals during the subsequent grinding process.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 2; 575-585
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Program rozwoju energetyki jądrowej w Polsce a zaopatrzenie w paliwa rozszczepialne z zasobów krajowych
Nuclear power development plans for Poland and uranium resources
Autorzy:
Strupczewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/282772.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
wydobycie uranu
ubogie rudy uranowe
bilans energetyczny wydobycia rudy ubogiej
błędy Storm van Leeuvena
zasoby uranu w Polsce
uranium mining
low grade uranium ore
energy balance for low grade uranium ore
errors of Storm van Leeuven
uranium resources in Poland
Opis:
W październiku 2007 r. Parlament Europejski przyjął uchwałę stwierdzającą, że energetyka jądrowa jest niezbędna dla Unii. Wiele krajów wznowiło swe programy energetyki jądrowej i przystępuje do budowy nowch elektrowni. Jednakże przeciwnicy energetyki jądrowej twierdzą, że w miarę wyczerpywania zasobów uranu energia potrzebna na uzyskanie uranu będzie szybko rosła, przekraczając energię, którą można uzyskać z rozszczepienia tego uranu w elektrowni jądrowej. W artykule rozpatrzono pełny bilans energetyczny dla górnictwa uranowego, obejmujący nie tylko energię potrzebną na wydobycie rudy i separację uranu, na odsalanie wody morskiej i jej dostarczenie do kopalni i okolicznych osiedli, ale także paliwo potrzebne do przewozu i kruszenia rudy, materiały wybuchowe, chemikalia na ługowanie uranu i energię na rekultywację kopalni po jej zamknięciu. Okazało się, że twierdzenia przeciwników są mylne. Nawet dla kopalni o najniższej zawartości uranu w rudzie, poniżej wskazanego przez przeciwników progu opłacalności energtycznej, energia uzyskiwana z rozszczepienia jest około 70 razy większa od całej energii na cały cykl paliwowy, od wydobycia uranu poprzez budowę elektrowni do jej zamknięcia i unieszkodliwiania odpadów radioaktywnych. Rudy o niskiej zawartości uranu można wykorzystywać. Jest to wniosek ważny dla Polski - nasze rudy ubogie i uran uzyskiwany jako produkt uboczny np. przy produkcji miedzi mogą zapewnić paliwo dla dużego programu rozwoju energetyki jądrowej w Polsce.
In October 2007 the European Parliament declared, that nuclear power is indispensable for the European Union. Many countries revive their nuclear power programs or start building new nuclear power plants. However, the opponents of nuclear power claim that as uranium resources get exhausted the energy needed to mine low grade uranium ore will be larger than the energy that can be obtained from fission in a nuclear power plant. The paper considers the total energy needs for uranium mining, including not only electricity needed for mining and milling, for water treatment and delivery to the mine and to the neighboring settlements, but also fuel for transportation and ore crushing, explosives for rock blasting, chemicals for uranium leaching and the energy needed for mine reclamation after completed ore exploitation. In contrast to the estimates of nuclear opponents based on mining experience with rich ores mined some 30 years ago, the study of IAE has used the most up to date data, reflecting the actual state-of-art mining practices. Since the opponents state clearly that the ore containing less than 0,013% U3O8 cannot yield positive energy balance, the paper considers mines of decreasing ore grade: Ranger 0.234% U, Rossing 0.028% U and Trekkopje 0.00126% U, that is with ore grade below the cut-off value postulated by opponents. The energy needed for very low grade uranium ore mining and milling increases but the overall energy balance of the nuclear fuel cycle remains strongly positive. Even for the mine using the poorest uranium ore the energy obtained at the NPP is about 70 times larger than that needed for the whole nuclear fuel cycle, including the energy needed for radioactive waste storage, the NPP construction and decommissioning to the green field status. The claims of nuclear opponents are shown to be wrong. Low grade uranium can be used. This also means that Polish uranium resources those in low grade ores and those obtained as a by-product of copper production, can provide fuel for a large program of nuclear power development in Poland.
Źródło:
Polityka Energetyczna; 2009, T. 12, z. 2/2; 565-576
1429-6675
Pojawia się w:
Polityka Energetyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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