Tanks generally can be classified according to their position on the ground and underground. Based on this classification, the classification of ground storage tanks is usually made according to their shape, material, and type of roof. This paper shows the classification of ground storage tanks according to their construction and purpose and describes the main types of ground storage tanks, their construction, advantages and disadvantages.

In this work, a hydrometallurgical process for the recycling of diamond core drilling crowns by means of aqua regia leaching and subsequent alkali leaching was investigated. This investigation continues a previous study in which nitric acid was used for the acid leaching phase. In the current study, higher tungsten recovery was achieved, reaching 98.2%, which is an improvement of about 1.5%. Another advancement of this study was the high Co recovery (97.21%) and the high purity of the tungsten trioxide obtained, comparable to the previously proposed technological process. Furthermore, a novel laboratory method for testing recycled diamond drilling crowns based on infrared thermography was introduced. Although this innovative approach is not the most accurate, it is fast and cost-effective and provides valuable results before the actual field test is conducted as a final evaluation. In addition, the infrared thermography method offers the advantage of non-destructive testing, ensuring that the diamond drilling crowns can be assessed without compromising their structural integrity. Other instrumental methods used to characterize the products and intermediates were X-ray diffraction (XRD), scanning electron microscope with energy dispersive X-ray spectroscopy (SEM-EDS), and laser desorption ionization mass spectrometry (LDI-MS). The analytical method for the concentrations in all working solutions was ICP-AES.

The influence of a new smelting technology in the Copper Smelter Bor on the content and chemical composition (As, Cd, Ni, Pb) of the total atmospheric deposition (TAD) in the Bor town urban areas was analyzed in this paper. The results of measurements the TAD in the period 2014-2015 (old smelting technology) were compared with the results for the period 2016-2017 (new smelting technology). The analysis was carried out for three locations in the Bor town (Technical Faculty - TF, Town Park - TP, and Mining and Metallurgy Institute Bor - IN). As a result of changes in the smelting technology and better treatment of waste gases, predominantly SO2, the pH values of the TAD have changed at all sampling points from acid (5.8 pH) to base (7.8 pH). The increase in the As content as well as the reduction of Cd content in the TAD was also detected at all sampling points while the Ni and Pb contents in the TAD have been slightly changed in the observed period. At the sampling points of the TF and TP, the maximum permissible concentration of the TAD (200 mg·m-2·day-1) for the annual averaging period is exceeded, during the old smelter operation. As a result of better treatment of the smelter waste gases in 2017, only one exceeding of the maximum allowed concentration of the TAD (450 mg·m-2·day-1) in monthly samples was recorded (at the sampling point TF). Only at the TF, the maximum permissible concentration for the annual averaging period is exceeded in 2017. The presence of a very strong (r> 0.8) and strong (0.8 >r>0.6) Pearson correlation between the heavy metals determined in the TAD was observed at all sampling points during the new smelter working period, as opposed to the old smelter working period when these correlations were weaker. U cilju ispitivanja uticaja nove tehnologije topljenja kocentrata Cu u topionici u Boru na količinu i hemijski sastav (As, Cd, Ni, Pb) ukupnih taložnih materija (UTM) izvršeno je poređenje rezultata merenja u periodu 2014-2015 (stara tehnologija topljenja Cu) sa rezultatima merenja iz perioda 2016-2017 (nova tehnologija topljenja Cu). Analiza je izvršena za tri merna mesta u urbanoj sredini grada Bora (Tehnički fakultet - TF, Gradski park - TP, i Institut za rudarstvo i metalurgiju - IN). Kao posledica promene tehnologije topljenja i boljeg tretmana otpadnih gasova, pre svega SO2, na svim posmatranim lokacijama došlo је do promene pH vrednosti UTM, od kiselog (5.8 pH) ka baznom (7.8 pH). Takođe, u periodu rada nove topionice, na svim posmatranim lokacijama uočeno je povećanje sadržaja As u UTM kao i smanjenje sadržaja Cd. Sadržaj Ni i Pb u UTM je neznatno promenjen u posmatranom periodu. Na lokacijama TF i TP u periodu rada stare topionice prekoračena je maksimalno dozvoljena koncentracija UTM od 200 mg·m-2·dan-1 za godišnji period usrednjavanja. Kao posledica boljeg tretmana otpadnih gasova iz topionice u 2017. godini zabeleženo je samo jedno prekoračenje maksimalno dozvoljene koncentracije UTM od 450 mg·m-2·dan-1 u mesečnim uzorcima, i to na lokaciji TF. Jedino na ovoj lokaciji je u 2017. godini detektovano i prekoračenje maksimalno dozvoljene koncentracije UTM za godišnji period usrednjavanja. Pored toga, u periodu rada nove topionice, na svim posmatranim lokacijama uočeno je prisustvo veoma jake (r> 0.8) i jake (0.8>r>0.6) Pearson-ove korelacije između teških metala detektovanih u UTM, za razliku od perioda rada stare topionice kada su ove korelacije bile slabije.

The production of fruit brandies is based on distilling fermented fruit juices. Distillation equipment is usually made of copper. In traditional manufacturing, it consists of a boiler (batch) distiller, a boiler (pot), a steam pipe, and a condenser, all of which are made of pure copper. This study determined the corrosion parameters for copper (Cu) and Cu72Zn28 (in wt%) alloy in fermented apricot juice at room temperature. The fermentation process examined in this research utilized natural strains of yeast and bacteria, supplemented by active dry yeast Saccharomyces cerevisiae strains. This research used the following methods: open circuit potential (OCP), linear polarization resistance (LPR), and Tafel extrapolation to identify corrosion parameters. Cu had a 3.8-times-lower value of corrosion current density than brass, and both were within the range of 1–10 μA·cm⁻², with an excellent agreement between LRP and Tafel. This study proved that Cu is an adequate material for the distillation of fruit brandies from a corrosion perspective. Despite this, there are occasional reports of corrosion damage from the field. Significant corrosion impacts can arise, as evidenced by laboratory tests discussed in this paper. In the absence of a highly corrosive environment, this study indicates that, to some extent, microbiologically influenced corrosion (MIC) can influence the degradation of the equipment material.

In this work, the stir casting method was applied to obtain composites based on the alloy AN EW 6061 used as a metal base, and Al2O3 particles as a reinforcement. Composites play a significant role as engineering materials. Therefore, it is necessary to study, in detail, the production methods and the factors that affect their mechanical properties. For this purpose, we have carried out a planned experiment wi ASM International th the aim to use regression analysis to predict the influence of particle size and mass fraction on hardness of the obtained composites. The full factorial experimental design with two factors was used, which was analyzed at three levels. Hardness was observed as a system response, while particle size and mass fraction were set as influencing factors. Influencing factors were observed at three levels: 50, 80 and 110 ?m for the particle size and 2, 5 and 8 mass%. Measured hardness values of the composites ranged from 72 HV10 to 80 HV10. Based on the probability values (p<0.05), it was determined which factors are important for the system response. Statistical analysis has shown that linear terms of the influence factors (size and mass fraction of reinforcement particles) and the square term of the mass fraction have statistical significance on the hardness change. The square term of the particle size and the interaction term of the influencing parameters do not have a statistically significant contribution in predicting the hardness value. Thus, a second-order polynomial model was obtained by the regression analysis. Influence of input factors on the system response and the adequacy of the obtained mathematical model were determined by using the Analysis of Variance (ANOVA). Based on the statistical data analysis, it was established that, the particle mass fraction has a greater influence on hardness of the obtained composite in relation to the particle size. By comparing the experimental and predicted values, a high degree of agreement was achieved so that the chosen model of the factorial experiment was adequate (R2=0.989). It can be also concluded that the developed regression model can be applied to predict hardness of the aluminum composite reinforced by Al2O3 particles in the chosen variation interval of particle size and mass fraction.