JOURNAL OF MINERAL RESOURCES ENGINEERING
Year:2019 | Volume:4 | Issue:3 |Papers Count:9

Exploration and exploitation of mineral deposits could increase heavy metal contents in the environment around the deposits. In mining areas, water flow facilitates dispersion of the metal contamination. Thus, due to the toxic effect of heavy metals on environment and human, it is important to recognize sources of the contamination for the possible fixing of such problems. In this study to investigate the contaminations caused by heavy metals, element contents of Cr, Co, Ni, Cu, Zn, Cd, Pb, and As in 911 stream sediment samples, which were taken from Baft area, Kerman province, were used. Pollution load index, Ecological risk index, Geo-accumulation index, Contamination Factor, and Modify Contamination Degree were applied to delineate contaminated areas. Outcome demonstrated that there are moderate to intense contamination of Zn, Cd, Pb, Cr, Ni, and As in some parts of the area. Inspection of upstream of the contaminated samples illustrated that sources of the contamination are mainly mining and anthropogenic activities. Due to the proximity of the pollution sources to residential areas and its negative effect on the catchment watershed and basins, continuous monitoring of the pollution, caused by mineral activity, is recommended to modulate the negative influence of the contamination.

This paper aims to investigate the hydrocarbon potential and organic matter maturity of Sarchahan and Faraghun formations between coal layers. To do this, we implemented the kinetic parameter and Rock-Eval 6 Pyrolysis analysis methods. Results showed that moving toward the coastal Fars (Sarchahan Formation) and from south of Iran to the central part of Fars bay (Faraghun Formation), there is an increase in the maturity of the organic matter.

The main production operations in most mines are drilling, blasting, loading, and hauling. Therefore, the optimization of each part causes an increase in profits and a decrease in mining costs. About 50 to 60 percent of mining costs are related to machinery, and the major share of them belong to loading and hauling machine. So, the correct utilization of the haulage fleet is very important step to increase productivity and to reduce production costs of the systems. In this study, by using simulation method and utilization of Arena software, the operation of the current production system of Abadeh Fireclay mine have been studied. Results showed that the productivity of loading machines in mine is low and due to the shortage of trucks the unit production costs of haulage system be increased. By using the high-capacity machines in mining operations, mine production will be increased and also production costs will be reduced significantly. Moreover, when flexible dispatching approach is used with proportionate loading and hauling machines, production will incr ease by 4 to 8 percent with a given number of trucks and also production costs will decrease by 5 to 7 percent.

Rock fragmentation can show the quality of blasting. Screen analysis can be also a precise method to determine size distribution of blasted rocks, but it is a difficult undertaking and sometimes impossible that is due to the time consumed and large volume of crushed rocks. Nowadays, digital image processing is used to evaluate the rocks fragmentation due to its acceptable accuracy and speed. In this research, WipFrag and Split Desktop were compared for evaluation of crushed rocks. Case study was focused on fragmented rock in Jajarm limestone mine. At the first, an image was delimited manually in the both software. Then the results were compared with screen analysis, showing that the results of Split Desktop are closer to the screen analysis results. Maximum difference between screen analysis and results of Split Desktop and WipFrag is equal to 3. 59% and 11. 38%, respectively. Some comparative modes including the delimitation method effect (automatically and manually), the image rotation effect, and the separation of an image into four quarter images and a combination of the results are investigated. Maximum difference between the automatically and manually delimitation by Split Desktop and WipFrag is equal to 1. 28% and 3. 79%. Maximum difference for the image rotation effect for Split Desktop and WipFrag is equal to 1. 96 perc%ent and 8. 09% and Maximum difference for the separation of an image effect for Split Desktop and WipFrag is equal to 3. 01 percent and 9. 58 percent. Consequently, in all modes investigated the Split Desktop shows more efficient results.

This article focuses on the process of manufacturing of 1. 5-inche diameter synthetic cores for fracture studies. The results of this study are suitable for rock mechanical studies as well as reservoir engineering and geomechanical experiments. These cores were manufactured by a fracture pattern, and the main focus on them was the possibility of performing the surface roughness characteristic in a controlled manner. In these cores, unlike the same examples, the roughness pattern was created non-randomly. For this purpose, the Triangular form (Sawtooth) was used as a supposed synthetic structure in the design of rough patterns. To achieve this goal, Reactive Powder Concrete (RPC) has been selected as the main material after studying on a variety of materials to make synthetic samples. To perform concrete, and considering RPC, several mixing designs were tested. The accepted mixing designs are compared together and presented as the results of the research. The structure and texture of provided core are similar to natural ones, in comparison with the other common samples were made of fiberglass. High Uniaxial Compressive Strength (UCS), and ability to implementation a variety of specific and complex geometric patterns such as Triangular Pattern (Sawtooth form), are two complementary advantages of the proposed samples. It should be mentioned that making the patterns on natural rocks is usually impossible, and also expensive, while cheap with high UCS in the case of synthetic samples. Also these cores haven’ t any micro-fractures. The capability of perfectly suiting the particles helps to implement variety patterns.

The aim of this study is to optimize the effective parameters for cerussite flotation to concentrate it with an acceptable assay and recovery values. To do this, the effect of parameters such as: frother dosage, sodium sulfide dosage, potassium amyl xanthate, Danafloat 507, Danafloat 233, Danafloat 245, sodium isobutyl xanthate and sodium isopropyl xanthate as collector, collector dosage, grinding time, solid content, pH, Aeration at conditioning time, increasing conditioning time, desliming, regrinding, scavenger and add collector step by step were investigated. Then, under optimum conditions, cleaner tests were carried out in different conditions. The results showed that on rougher stage, on carbonated lead sample with grade of 6. 5, under optimum conditions of pine oil 30 g/ton, 5000 g/ton of sodium sulfide as cerussite sulfidizer agent, 1000 g/ton of collector 507, d80 75 micron, pH 9, solid content of 30, was obtain a concentrate with a grade of 17. 0 and recovery of 81. 7. However, the grade of Pb in the final tail is about 1. 8%. Increasing the conditioning time for sodium sulfide, collector and pine oil from respectively 10, 4 and 1 minutes to 15, 6 and 2 minutes resulted in a slight increase in grade and a slight reduction in the recovery. Finally, in the cleaner stage, when fresh water and half of the chemicals used in the rougher stage were used, after 6 stage of cleaning, was obtain the final concentrate with assay and total recovery respectively 63. 8% and 57. 5%.

There are different methods to remove contaminants. For this, adsorption process is one of the most successful methods. Increasing the effectivness is the main purpose of using nano-absorbent. By reducing the size of the adsorbent particles, the amount of eliminated ions increases. Considering the importance of environmental protection, control, reduction and elimination of toxic and inorganic pollutants from water and effluent, this paper aims to demonstrate the effectivness of using bauxite waste, as a cheap and non-toxic adsorbent, for removing copper and manganese metal contaminants from acid mine drainage of Sarcheshmeh copper mine.

In present study kinetics and equilibrium isotherms models were used in static / batch technique to demonstrate phenomena involving in the process of Rhenium ions uptake on Purolite A170 ionite. In order to realize the adsorption mechanism, four widely used adsorption isotherm models were subjected in detail. The results suggested that in general all models applied generate a satisfactory fit on laboratory data but both Freundlich and D-R isotherm models showed the selectivity coefficient (R2) more than 0. 99, and so they can be used to track the equilibrium of the process. Also, in current conditions the maximum monolayer coverage capacities (qm) from the Langmuir isotherm was calculated to be 166. 67 mg/g. Modeling of the batch kinetic adsorption was performed by pseudo first order, pseudo second order, Elovich and Intraparticle diffusion equations. The analysis of the results showed that the pseudo second order model can define the adsorption rate properly than others.

There are several methods including physical, biological, and chemical procedures to remove heavy metals from water and wastewater. Adsorption is recognized as low cost and simple method with the high performance of heavy metals elimination from aqueous solution. Heavy metals removal by adsorption using iron oxides has always been a matter of interest due to the availability and low cost. In the present study, the feasibility of Pb and Cu removal from synthetic wastewater using hematite were investigated. Moreover, the effects of parameters including pH, dosage of adsorbent, dosage of contaminates, and removal time were studied. In this study, hematite was prepared using chemical precipitation method. The properties of the adsorbed compounds were determined using XRD analysis. Firstly, the adsorption process was investigated to remove lead and copper from simulated wastewater, then the attempt was to remove the mentioned metals from the original sewage sludge of Sungun factory. The optimal pH for the Pb and Cu removal was around 6. The maximum removal percent of Pb and Cu using hematite was determined as 94% and 90%, respectively. The adsorption process of Pb and Cu was in accordance with the pseudo-second order model. Further, the results revealed that the removal process of both cations were in accordance with the Langmuir isotherm model.