Scientific Mining Journal

Scientific Mining Journal

Volume 59 - No 2 (June 2020)
EXTRACTION OF LANTHANUM AND CERIUM FROM A BASTNASITE ORE BY DIRECT ACIDIC LEACHING
DOI 10.30797/madencilik.757979 Sait Kursunoglu, Soner Top, Shokrullah Hussaini, Hasan Serkan Gokcen, Mahmut Altiner, Safak Ozsarac, Muammer Kaya
The extraction of lanthanum (La) and cerium (Ce) from a bastnasite ore by direct acidic leaching was investigated. The effects of acid concentration and leaching temperature on the extraction of La and Ce from the ore were tested. Using nitric (NHO3), more than 85% of the La and Ce were simultaneously extracted in to leach solution whereas the La and Ce dissolutions were leach determined as less than 85% by using sulfuric acid (H2SO4). The La dissolution exceeded 90% by using hydrochloric acid (HCl); however, the Ce dissolution remained below 85% under the following conditions: solid-to-liquid ratio of 20% (w/v), the acid concentration of 20%, leaching temperature of 25 °C and leaching time of 1 h. The result revealed that HNO3 could be used as a solvent for the maximum simultaneous extraction of the La and Ce from the bastnasite ore. The leaching temperature had no crucial effect on the dissolution of La and Ce when HNO3 or HCl solutions were preferred as a solvating agent. However, the leaching temperature had a slight positive effect on the dissolutions of La and Ce when H2SO4 was used as a solvent.
DISSOLUTION PROPERTIES OF A DOLOMITE CONTAINING ZINC ORE IN SODIUM HYDROXIDE SOLUTIONS
DOI 10.30797/madencilik.757995 Cavit Kumas, Ilhan Ehsani, Abdullah Obut
In this work, the dissolution properties of a dolomite containing zinc carbonate (smithsonite) ore sample having 24.22% ZnO were determined in sodium hydroxide solutions using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermal (TG/DTA) and chemical analyses methods. It was observed that the dissolution efficiency value of zinc continuously increased with the increase of sodium hydroxide concentration from 1 to 4 M and the highest zinc dissolution efficiency of 70.7% was reached after dissolution in 4 M NaOH solution at temperature of 298 K. The XRD, FT-IR, TG/DTA and chemical analyses of undissolved solids obtained after dissolution of ore sample in 4 M NaOH solution at 298 K revealed that the smithsonite phase in the sample completely dissolved whereas the main gangue mineral dolomite remained practically unaffected, showing the selectivity of sodium hydroxide solution considering zinc dissolution. Although the smithsonite phase in the sample totally dissolved, hundred percent zinc dissolution efficiency could not be reached, which may indicate the presence of zinc in the gangue components, i.e. dolomite, clay minerals etc., of the studied ore sample.
NON-REPEATED SUPPORT TECHNOLOGY OF GOB SIDE ENTRY RETAINING WITH ROOF CUTTING TO RELEASE PRESSURE
DOI 10.30797/madencilik.758004 Bukang Wang, Qi Wang, Fei Yan
Temporary support of the gob side entry is of great significance to the safety mining. Taking the 1206 transportation tunnel of Shuguang Coal Mine as the engineering background, firstly, the key technical parameters of roof cutting to release pressure were given, the bolt and cable support parameters before entry retaining and the large deformation constant resistance cable reinforcement support parameters of retained entry were determined. Secondly, according to the overlying strata collapse patterns and mechanical model of gob side entry, the calculation formula of temporary support resistance in the dynamic pressure bearing area was derived. Finally, on the basis of determining the temporary support parameters, ZLQ2826/22.5/38 type of non-repeated support and transportation equipment of alternating pressure cycles was developed, the main technical parameters and structural characteristics were analyzed, and a new type of fast and efficient non-repeated temporary support technology in the dynamic pressure bearing area was proposed. Field practice shows that the support parameters are reasonable, the support equipment and bolt support system have a good cooperative support effect, and the roof subsidence and roof separation have been effectively controlled. In the subsequent use process, the structure of support devices should be further optimized to improve the support effect.
EFFECT OF PHYSICAL AND MECHANICAL PROPERTIES OF ROCKS ON THE IMPACT HAMMER PERFORMANCE IN NİĞDE PROVINCE QUARIES
DOI 10.30797/madencilik.758009 Mehmet Sari, Tevhit Yilmaz, Ramazan Comakli
In this study, the effects of physical and mechanical properties of the rocks on the performance of impact hammers used to crush boulders in muck piles produced after drilling and blasting were investigated for seven different quarries operating in Niğde province. For this purpose, the muck piles were analysed using image processing method to determine the amount of the boulders. Total operating time and breaking rate of the hydraulic impact hammers were measured during a secondary breaking task for oversized boulders. Hydraulic hammers with the similar specifications were employed in all quarries visited in this study. In this regard, it was possible to investigate the relationships between hydraulic hammers’ instantaneous production rate with the physical and mechanical properties of the rocks by simple regression method. Accordingly, significant linear relationships in various levels were found between the physical-mechanical properties of the rocks and hydraulic hammer performance. At the end of the study, a multiple linear regression equation was proposed to estimate instantaneous production rate of the impact hammers based on the independent parameters.
PREPARATION OF CEMENT GRINDING AIDS BASED ON ALUMINA COMPOUNDS
DOI 10.30797/madencilik.758018 Jin Hyok Ri, Yun Sam Pak, Kuang Song Yun
When the cement grinding is performed in the ball mill, the grinding efficiency decreases due to the aggregation of the particles by the electrostatic phenomenon. Therefore, a lot of techniques for preventing agglomeration using various grinding aids have been introduced. In this study, for mineral grinding, the grinding aid composition including a water-soluble aluminate compound and the grinding method in which this grinding aid is used were described. Grinding aids based on aluminate-based compounds not only have high grinding efficiency but are also thermally stable as they are inorganic materials. Compared with the conventional grinding aids based on organic materials such as DEG and TIPA, even if the solid content is half contained, the grinding efficiency is similar and thus the cost can be reduced to half.
ANNUAL PLANNING OF ORE AND Pb, Zn, Ag METALS PRODUCTION IN “TREPÇA” MINE IN STANTËRG
DOI 10.30797/madencilik.758020 Rafet Zeqiri
Underground mines are known as mines of particular importance, for the production difficulties, production cost, safety factor and workforce number. Ore is mined from the depths of the underground with a preliminary justification on the amount of ore at the source, the quality of the ore and general reserves and then based on them the daily, monthly or annual production is planned. The geological rock stability in the specific case constitutes special importance in determining the underground mining method, dimensioning of the capital mine works and the selection of work machinery. The purpose of the production organization is to produce through mining activities the necessary products for the market (necessary material goods) in the amount and quality required by the market, at the time they are expected by the market and at a price acceptable by the market.