We present the articles of the third issue of scientific journal "Mining Science and Technology” (Russia) for 2024:

The paper presents the results of the dependence of wastewater treatment efficiency on the size of filtering material fractions.

For more information, see the article:

📌 Ivanova L.A., Prosekov A.Yu., Ivanov P.P. et al. Assessment of the efficiency of wastewater treatment from coal enterprises for suspended solids using various filtering materials. Mining Science and Technology (Russia). 2024;9(3):263-270. https://doi.org/10.17073/2500-0632-2024-03-227

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#inenglish #MST #wastewater #coal #suspension #filtration #quartzite #treatment #gravity #sedimentation #fraction #coagulation #sump #regeneration #washing #backwashing #dynamic #quarry #sand #crushedstone #zeolite #sorbent #pump #dam #dust #clay #method #technology #hydraulics

How can we increase residual uranium extraction from previously worked-out blocks without significant cost? What factors influence the choice of solutions?

One of the most important factors in the formation of residual uranium reserves in worked-out blocks is the presence of clay minerals in the ore horizon. In this regard, the authors of the article published in the journal "Mining Science and Technology" conducted a number of studies on the adverse and positive effects of clay minerals on ISL process. Water permeability and relatively good filtration (not less than 0.5–1 m/day) of ores and rocks of a productive horizon (aquifer) is the most important hydrogeological factors affecting the performance of uranium ISL. The second most important hydrogeological factor is the lack of fluid communication between the productive aquifer and nonproductive aquifers, i.e., the obligatory presence of aquicludes.

For more information, see the article:

📌 Petukhov O.F., Khalimov I.U., Istomin V.P., Karimov N.М. The effect of clay minerals on in-situ leaching of uranium. Mining Science and Technology (Russia). 2023;8(1):39-46. https://doi.org/10.17073/2500-0632-2022-10-20

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#inenglish #MST #uranium #insituleaching #ISL #clay #clayminerals #filtration #diffusioncoefficient #permeability #waterpermeability #sorption #montmorillonite #kaolinite #aquiclude #nitrateions #cationexchangecapacity #CEC #bentonite #ore #horizon #orehorizon #uraniumreserves #residualuraniumreserves #hydrogeologicalfactors #sulfatesolutions #bicarbonatesolutions #staticuraniumexchangecapacity #colloidalspecies #filtrationcoefficient #aquiclude #protectiveaquiclude #uraniumsorption #clayswelling #permeability #sands #sandstone #sandstonetypedeposits #uraniumextraction #claycontent #uraniumlosses #clayaquicludeprotectiveaction #ore

How to Optimize Ventilation in Mines Using Diesel Equipment?

🔹 Problem: Modern mines utilize high-power diesel equipment, significantly increasing ventilation load. Traditional airflow calculation methods overestimate requirements by 50%, leading to substantial costs.

🔹 Solution: Researchers developed a novel methodology based on field measurements of actual emissions and numerical simulation. This enables precise determination of airflow needed to dilute harmful substances to safe concentrations.

🔹 Key Results:
✅ Reduced ventilation costs through accurate emission accounting
✅ Optimized air distribution in mine workings
✅ 3.5× decrease in CO and NO₂ concentrations with proper ventilation

For more information, see the article:

📌 Senatorov V.A. Determining airflow requirements in mine workings based on field measurements of actual emissions from internal combustion engine equipment. Mining Science and Technology (Russia). 2024;9(1):53-59. https://doi.org/10.17073/2500-0632-2024-01-203

💡 Conclusion: Innovative calculation methods represent a breakthrough in cost efficiency and environmental safety for mining operations!

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#InEnglish #MST #mining #ventilation #diesel #exhaustgases #numericalsimulation #safety #undergroundmining #ICE #aerodynamics #fieldmeasurements #concentration #CO #NOx #MAC #standards #optimization #costreduction #energyefficiency #technology #digitalization #monitoring #mineatmosphere #workings #aircontrol #hazardoussubstances #filtration #temperature #pressure #humidity #analysis #equipment #efficiency #research #methodology #calculation #dynamics #operationmode #load #results #implementation #practicalapplication

How to improve power quality in variable-frequency drives for scraper conveyors?

🔌 Challenge:
Modern mines are actively implementing VFDs for scraper conveyors. However, this introduces voltage and current distortions, reducing energy efficiency and safety.

📊 Research:
Scientists from MISIS analyzed harmonic distortions in MPDS and evaluated the effectiveness of HFs, reactors, and SFs.

🔹 Key Findings:
✔️ HFs and reactors reduce harmonics upstream of the FC by 70–90%.
✔️ SFs mitigate distortions downstream of the FC but require precise tuning.
✔️ Harmonics in leakage circuits (especially 3rd, 5th, 7th) impact RCDs and personnel safety.
✔️ Combined use of HFs, reactors, and SFs delivers optimal results but needs technical-economic justification.

⚠️ Risks:
Higher harmonics in leakage circuits pose safety hazards and disrupt protective devices.

💡 Recommendations:
1️⃣ Deploy HFs and reactors to suppress harmonics upstream of the FC.
2️⃣ Carefully select SF parameters.
3️⃣ Account for harmonics when configuring RCDs.
4️⃣ Implement real-time power quality monitoring.

📌 Conclusion:
Enhancing power quality in VFD-driven scraper conveyors demands a holistic approach and adaptive protection systems.

For more information, see the article:

📌 Petrov V.L., Pichuev A.V. Assessing the efficiency of measures to enhance electric power quality in variable-frequency drive for scraper conveyors. Mining Science and Technology (Russia). 2024;9(1):60-69. https://doi.org/10.17073/2500-0632-2024-01-198

How do you address these challenges? Share your insights below!

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#InEnglish #MST #PowerEngineering #MiningTechnology #VFD #ElectricalSafety #PowerQuality #MPDS #HF #Reactor #SineFilter #RCD #Harmonics #Distortion #Voltage #Current #FrequencyConverter #AVI #PWM #UndergroundNetworks #EnergyEfficiency #Protection #Modeling #GOST #Insulation #Compensation #Filtration #MISIS #Research #PracticalSolutions