The producing of lead and elemental sulfur by new technologies from galenite ores

These investigations have developed an effective hydrometallurgical method to recover high-purity lead metal and elemental sulfur from simulated galena synthetic mixures eliminating sulfur gases and lead emissions, in contrast to the current high-temperature smelting technology. The method consists of different operations: oxidative leaching with production of solution with residue containing elemental sulfur., electrowinning by the solution with metal production. The obtained results determined the optimal parameters for possible processing of natural domestic galena ores

Prilog proucavanju procesa segregacionog przenja u cilju ekstrakcije nikla iz oksidno - silikatnih nikonosnih ruda

Prilog proucavanju procesa segregacionog przenja u cilju ekstrakcije nikla iz oksidno - silikatnih nikonosnih ruda. Obradzena je termodinamika i kinetika heterogenih reakcija na radnoj tempteraturi od 750 stepeni do 950 stepeni, dodatak kalciumhlorida od 2,5%, koks 0,5-1%, sulfidnih dodataka i slicno. Proracunati su izobarni potencijali reakcija segregacije i kineticke konstante pomenutih reakcija na radnim uslovima

Current applications of micro - organisms in the leaching of copper and gold from chalcopyrite low grade ores

The conventional flotation technologies cannot provide fair results when applaid to very low grade ores or to "refractory" ores. This class includes intimate and nonuniform mineral associations, with partialy oxidized minerals and high secondary mineral content and also high soluble salt content, pre-activated minerals because of the excessive permeability of the deposit and of the intense circulation of waters with heavy metal ions etc. Bacterial oxidation as a means to the recovery of metals from sulphidic deposits has been used for thousands of years. One of the major use of biooxidation is the leaching of copper or the liberation of refractory gold where this is encapsulated in pyrite. In the Bucim copper mine Macedonia, porphiritic type, the final product from flotation is the copper concentrate consisting 20% Cu, 21g/t gold and 25g/t silver, with recoveries: 88% for copper, 60% for gold and 35% for silver. The carried out investigations of the leaching in the agitated tank involve micro-organisms, thiobacillus ferro - oxidans and thiobacillus thio-oxidans. The achieved results are following: Copper recovery 95%, gold recovery from 70-85% and silver recovery from 70-80%

Идеен проект за максимално завршно надвишување на постојното хидројаловиште на погонот флотација на рудникот за бакар „Бучим” - Радовиш

Идејниот проект се изработува за да после извршена ревизија и усвојување постане подлога за изработка на дополнителен проект, односно техничка документација на ниво на главни проекти по кои во иднина би се вршело завршно надвишување на флотациското хидројаловиште Тополница. Овој идеен проект ги содржи следниве аспекти: 1.0 Идејно техничко решение за максимално завршно надвишување на постојно хидројаовиште- над кота од 630 м; 2.0 Технологија н хидротранспорт, развод и одлагање на јаловината при максимално завршно надвишување на постојно хидројаовиште; 3.0 Одводнување на хидројаловиште - повратна технолошка вода; 4.0 Еколошка заштита на околината од хидројаловиштето – деконтаминација на прашината; 5.0 Оскултација на хидројаловиштето

Cable Distribution systems - an essential element of the global information society

Not long ago, before the advent of cable operators, here in Macedonia, especially in the smaller towns in this area in the developed countries was overwhelming. In Shtip were able to follow only two or three programs in the Macedonian Television. Later, in the nineties of the last century, there have been two more programs to private local television stations. Admission to these programs is done through external antennas. Nevertheless, due to the specific configuration of the terrain and tall buildings, it was not possible quality reception of TV programs in all parts of the city. On the other hand, this way of receiving television programs by external antennas (and several antennas for each family) and brings other problems. Among other things, in terms of aesthetic appearance of buildings resembling a "forest" of antennas. With the advent of cable operators, this picture changes significantly. At the beginning of its development, the cable operators only offered a service to its customers - analog TV. Today, cable operators offer more services, ie services, and are called Multi Service Operators (Multi service operator - MSO). They invest in quality and expensive equipment that receive and distribute to end users a number of TV and radio channels channels with high quality. Users however, relatively inexpensive monthly fee can enjoy the quality of TV channels, radio channels, internet, telephony and other interactive services. Today through KDS can carry more than 70 (seventy!) Analog television and radio programs as well as a much larger number of digital TV and radio channels. Additionally through KDS enables fast digital communication, access to high-speed, broadband Internet and fixed telephony. Modern cable distribution systems represents a form of electronic communication networks. Electronic communications networks other than cable can be partially or completely wireless

Processing of low- grade nickel bearing laterites

A combination of current trends and developments may undermine the sulphides supremacy and might tip the balance in favour of laterites for new investigations or projects. A list of current laterite operations or laterites processing today is following: Ferronickel smelting, Matte smelting, Reduction roasting-ammonia leaching and High pressure sulphuric acid leaching.Apart from the above mentioned process routes, there have been many attempts to develop processes know as alternative processes, which have included: Nitric acid leaching, Chlorine leaching, Acid pugging and sulphation roast, esspecialy Segregation Process et

The recovery of the biomass waste for industrial pellets by recycling

The biomass as an organic product which may be used as a fuel - biofuel or the raw material in the industry. The bio-fuel may be occurred as a plant or animal origin. These may be used by their direct combustion. The most effectively usefull method for biomass utilization is finalization in the pellet product as combustion product. The pellets have had appropriate parameters with geometry, caloric power, ash and dust. These wood products are rescent fuels produced by wood waste

Enhancing gold recovery by bioleaching of chalcopyrite low grade ore

The conventional flotation can't provide fair results when applied to very low grade ores or to "refractory" ores. This class includes intimate and nonuniform mineral associations, with partialy oxidized minerals and high secondary mineral content and also high soluble salt content, preactivated minerals because of the excessive permeability of the deposit and of the intense circulation of waters with heavy metal ions etc. Bacterial oxidation as a means to the recovery of metals from sulphidic deposits has been used specially gold recovery. The achieved results by microorganisms leaching by low grade cholcopyrite ores are folowing: gold recovery up to 85% and silver recovery up to 80%.

Logistics of passengers at the domestic airports

As statistics show, air travel is one of the most prevalent in this society of ours from day to day is increasing its use. Characteristic of air travel and transport is his speed but that speed depends from many factors. Some of these factors are: the speed and capacity of the aircraft, the speed of transport of goods to and from the airport warehouses them to planes, the speed of data processing for passengers and their luggage forwarding to the appropriate place for loading the plane, the speed of system transfer the luggage of a passenger to the appropriate place for loading the plane and the speed of the staff handled it. Hereafter will talk about all these factors which affect to a fast and successful air transport

Application of dispersion analysis for determining classifying separation size

The paper presents the procedure of mathematical modelling the cut point of copper ore classifying by laboratory hydrocyclone. The application of dispersion analysis and planning with Latin square makes possible significant reduction the number of tests. Tests were carried out by D-100 mm hydrocyclone. Variable parameters are as follows: content of solid in pulp, underflow diameter, overflow diameter and inlet pressure. The cut point is determined by partition curve. The obtained mathematical model and the values of the coefficients make it possible to find the classifying cut point for variable factors