SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL最新文献

Effects of the iron oxidation and precipitation processes on the arsenate sorption and coprecipitation 铁氧化和沉淀过程对砷酸盐吸附和共沉淀的影响

SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL Pub Date : 2020-10-10 DOI: 10.5281/ZENODO.4270111

Ivelina Moteva, P. Georgiev

{"title":"Effects of the iron oxidation and precipitation processes on the arsenate sorption and coprecipitation","authors":"Ivelina Moteva, P. Georgiev","doi":"10.5281/ZENODO.4270111","DOIUrl":"https://doi.org/10.5281/ZENODO.4270111","url":null,"abstract":"The main aim of this study was to assess the effects of ferrous iron oxidation, hydrolysis and precipitation of the ferric iron on the mechanisms of arsenate removal from acid mine drainage. The study was realized at the pH range 2,0 – 6,5. H2O2 was the oxidant used in the chemical test. A mixed culture of mesophilic iron-oxidizing chemolithotrophic bacteria (Acidithiobacillus ferrooxidans, Leptospirillum ferroxidans) carried out the ferrous oxidation in the biological test. NaOH was used as an alkalizing agent which triggered the ferric iron hydrolysis and precipitation. The results showed that the total content of retained arsenic by ferric iron hydrous oxides and its speciation as geochemical fractions depended on the iron and phosphate concentrations in acid solution. The results showed that phosphate concentration lower than 6 mg/ L limited the ferrous iron oxidation rate. At the tested experimental conditions, arsenic sorption by formed ferric iron hydrous oxides was the main mechanism for its removal from acid mine drainage, as the ratio between iron and phosphate determined the proportions between the geochemical fractions of scavenged arsenic.","PeriodicalId":239226,"journal":{"name":"SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115372763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CONTROL OF BLAST-INDUCED SEISMIC ACTION GENERATED BY TECHNOLOGICAL BLASTINGS 工艺爆破爆破诱发地震作用的控制

SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL Pub Date : 2020-10-10 DOI: 10.5281/ZENODO.4270102

Zdravka Mollova, V. Penev

引用次数: 0

DETECTION AND MONITORING OF MANGANESE IN DRINKING WATER AND GROUNDWATER THROUGH PHOTO-OXIDATION SENSORY REACTION WITH ULTRASMALL CARBON NANODOTS 超小碳纳米点光氧化感应反应对饮用水和地下水中锰的检测与监测

SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL Pub Date : 2020-10-10 DOI: 10.58903/a14161836

Svetlin Toshev, A. Loukanov

{"title":"DETECTION AND MONITORING OF MANGANESE IN DRINKING WATER AND GROUNDWATER THROUGH PHOTO-OXIDATION SENSORY REACTION WITH ULTRASMALL CARBON NANODOTS","authors":"Svetlin Toshev, A. Loukanov","doi":"10.58903/a14161836","DOIUrl":"https://doi.org/10.58903/a14161836","url":null,"abstract":"The paper focuses on the development of ultra-small carbon nanodots as sensitive sensors for detection and monitoring of manganese in drinking water and groundwater. The environmental contamination with manganese is often a result from industrial activities such as mining and agriculture. The soluble Mn ions are toxic for many organisms and might even cause serious human diseases. The strategy for sensory detection used by us is based on a photo-oxidation reaction, in which the carbon nanodots are dissolved in acidic solution and illuminated with UV irradiation ( = 365 nm). At these conditions the nanoparticles acted as photosensitizer and produced singlet oxygen, which can be monitored by 3,3’,5,5’-tetramethylbenzidine as an organic indicator. However, to proceed this reaction, it is necessary to introduce the redox pair Mn(II)/Mn(III) in the reaction mixture, which plays the role of a catalytic mediator for the electron transfer. Thus, the oxidation of 3,3’,5,5’-tetramethylbenzidine appears, which results in blue colour of the solution with absorbance maximum at 645 nm. The rate of this sensory reaction was significantly enhanced in the presence of EDTA, which was used as a ligand to obtain a stable complex of Mn(III)/EDTA. The formed complex itself oxidised the organic indicator and caused the colorimetric reaction. Among the other metal ions tested, only manganese could be detected by the presented sensory approach.","PeriodicalId":239226,"journal":{"name":"SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127474476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Jet fans efficiency in tunnel emergency situations 隧道紧急情况下射流风机的效率

SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL Pub Date : 2020-10-10 DOI: 10.58903/a14161828

N. Kostadinova

{"title":"Jet fans efficiency in tunnel emergency situations","authors":"N. Kostadinova","doi":"10.58903/a14161828","DOIUrl":"https://doi.org/10.58903/a14161828","url":null,"abstract":"Tunnel construction has become an important and growing activity. Tunnelling is an important part of transport infrastructure and is a part of the sustainable development of the country. The tunnel ventilation during construction and operation is part of the whole design procedure. Although ventilation might be performed with different approaches, longitudinal ventilation with jet fans is most often employed. The efficiency of such devices depends on several factors – design parameters, location in the tunnel, interaction with main current. The last one is crucial in emergency situations, especially during fires when both temperature and density of main current change. One important point in normal and emergency ventilation design is the downwind influence of jet fans. This paper presents a longitudinal scheme with jet fans. Based on energy and mass conservation, the interaction between the jet fan and the main current is considered, leading to expressions for areas of impact. Several models for fire temperature distribution downstream are presented, outcomes are compared and suggestions for use are made. Additionally, jet fan efficiency coefficients are adjusted due to modelling results.","PeriodicalId":239226,"journal":{"name":"SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125258853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

NON-DETONATING CHARGES IN POLYMER HOUSINGS FOR SMOOTH SPLITTING OF ROCK BLOCKS DURING PRIMARY EXTRACTION AND SECONDARY CUTTING 在一次提取和二次切割过程中，聚合物外壳中用于岩石块顺利分裂的非起爆装药

SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL Pub Date : 2020-10-10 DOI: 10.58903/a14161835

N. Stoycheva, P. Shishkov

引用次数: 0

Review of the iron recovery processes from laden leach liquors in hydrometallurgy 湿法冶金浸出液含铁回收工艺综述

SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL Pub Date : 2020-10-10 DOI: 10.5281/ZENODO.4270054

P. Georgiev, M. Ivanova, M. Nicolova, I. Špásová, S. Groudev

引用次数: 1

STUDY OF THE RELATIVE ENERGY CONSUMPTION OF A DRUM MILL TYPE SAG 8.5 X 5.3 滚筒磨型凹陷8.5 × 5.3的相对能耗研究

SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL Pub Date : 2020-10-10 DOI: 10.58903/a14161830

I. Minin, P. Nedyalkov, Simeon Savov, T. Hristova

引用次数: 0

SEISMIC EXPLORATIONS FOR DEFINING THE DAMAGE TO THE EARTH DAM PISHICA IN THE REPUBLIC OF NORTH MACEDONIA 北马其顿共和国皮西卡土坝破坏程度的地震勘探

SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL Pub Date : 2020-10-10 DOI: 10.58903/a14161824

Blagica Doneva, Marjan Delipetrev, G. Dimov

引用次数: 0

Laboratory model of a magnetic levitation system 磁悬浮系统的实验室模型

SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL Pub Date : 2020-10-10 DOI: 10.58903/a14161826

Yassen Gorbounov, Petar Peychinov

{"title":"Laboratory model of a magnetic levitation system","authors":"Yassen Gorbounov, Petar Peychinov","doi":"10.58903/a14161826","DOIUrl":"https://doi.org/10.58903/a14161826","url":null,"abstract":"The magnetic levitation consists of balancing the forces of attraction and repulsion of a ferromagnetic object located in a foreign magnetic field in such a way as to keep a desired distance between the object and the magnet. This technology is receiving increasing attention because it helps to eliminate the frictional losses due to the lack of mechanical contact. This makes it possible to reduce the wear of critical machine parts and achieve high speeds with increased positioning accuracy. Advanced applications include the high-speed Maglev trains, magnetic bearings and suspension, electromagnetic cranes, high-accuracy positioning of wafers in photolithography in the manufacturing of integrated circuits, and other high-precision contactless positioning devices. Positive results are also observed in applications from the mining and processing industry in the extraction and processing of raw materials, which makes the topic relevant. The paper presents a laboratory model of a single degree of freedom electromagnet-based system intended to aid the studying of the effect of magnetic levitation. The possibilities for the implementation of different positional feedback types are discussed together with the power circuit that drives the electromagnet. A mathematical model and implementation of a fully digital algorithm that uses the PID control law are presented. Experiments are conducted that could aid in building a sensorless control system. The elaborated laboratory model allows for easy upgrade and can be used in disciplines in the field of measurement, control, and automation as a whole.","PeriodicalId":239226,"journal":{"name":"SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128412573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

PROCESSING OF PYRITE CONCENTRATES WITH THE EXTRACTION OF NONFERROUS METALS: NICKEL AND COBALT TECHNOLOGY ELABORATION 黄铁矿精矿萃取有色金属的工艺:镍钴工艺的阐述

SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL Pub Date : 2020-10-10 DOI: 10.58903/a14161829

V. Luganov, T. Chepushtanova, G. Guseynova, Y. Merkibayev, K. K. Mamyrbaeva, Bishwambhar Mishra

{"title":"PROCESSING OF PYRITE CONCENTRATES WITH THE EXTRACTION OF NONFERROUS METALS: NICKEL AND COBALT TECHNOLOGY ELABORATION","authors":"V. Luganov, T. Chepushtanova, G. Guseynova, Y. Merkibayev, K. K. Mamyrbaeva, Bishwambhar Mishra","doi":"10.58903/a14161829","DOIUrl":"https://doi.org/10.58903/a14161829","url":null,"abstract":"The paper presents the results of the development of a technology for processing of pyrite concentrates with the extraction of nonferrous metals, iron and sulphur using the technology of two-stage dissociating roasting with hydrometallurgical processing of cinder. Hydrometallurgical processing of cinder was studied. It comprised of two steps - cinder leaching and extraction for processing multi-component solutions. Based on the results of laboratory tests, balance experiments were conducted on the chemical enrichment of nickel-poor and cobaltpyrite concentrates. The experiments included (i) Thermal decomposition of pyrite concentrate at a temperature of 660 - 700° C and a duration of 60 minutes, an oxygen flow rate of 30-50% of the stoichiometric; (ii) Leaching of the cinder with a HCl solution at a temperature of 90°C, liquid: solid = 8:1, pH 2,7 and a duration of 60 minutes; (iii) Filtration of pulp and precipitation of nickel and cobalt from solutions with iron sulphide. During leaching, mainly iron is transferred to the solution; nickel and cobalt remain in a small amount of cake (the cake weight is reduced by almost ten times compared to the thermal decomposition product). As a result, up to 99% of non-ferrous metals are extracted into the concentrate, and the solution becomes more concentrated in iron.","PeriodicalId":239226,"journal":{"name":"SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126413276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0