Leister equipment is “good as gold” in Mongolia installation
In October 2013, two companies based in Ulaanbaatar, Mongolia, Bayan Airag Exploration LLC (a mineral exploration and development company), and Usny Erchim Co., Ltd (Leister Technologies’ official sales partner), found themselves at the Northwestern region of Mongolia collaborating on the Golden Hills Heap Leach Project.
Heap leaching is an industrial mining technique used when extracting precious metals―like copper, uranium, gold, and other compounds—from ore via a series of chemical reactions.
The ore is first crushed and then “heaped” into large piles on plastic sheets which protect the soil against contamination. Once the solvent (typically cyanide) seeps through the piles of material, and bonds with the metal contained therein, the solution is then collected at the bottom of leach tanks as an enriched solution and pumped to a mill where more chemicals are used to separate the cyanide from the valuable metals. Therefore, it is of extreme importance that those plastic layers are absolutely leak-proof.
Massive tanks are currently being built in Doha, Qatar. They each have a capacity of 150,000 m3 and will later supply the pre-planned town of Lusail with valuable potable water. To protect the poured concrete foundation which is at risk of corrosion from saline groundwater, special focus is placed on the sealant system. To this end, a special protective layer made of PE is inserted. On the side filled with concrete, nubs ensure that the protective layer is optimally anchored.
A customized automated machine has been developed
The difficulty when connecting the individual sheets in the protective liner is welding them rationally. Leister Technologies AG has developed a special automatic welder for this. The tried and tested hot wedge welder ASTRO was retrofitted so it runs smoothly between the nubs and can weld the overlapping sheets. The ASTRO CPL (Concrete Protection Liner) runs at 1.5 to 2 meters per minute over the 3 mm thick PE sheets. It connects the stiff PE material with its maximum contact pressure of 1500 N securely and without problems.
Fourth Largest Coal-Fired Power Station in the World
Upon completion, the Kusile power station, located in the Mpumalanga district of South Africa, will become the fourth largest coal-fired power plant in the world.
This station, with a total capacity of 4,800MW, is part of the Eskom group (South African public electric utility) and will be the first power station in South Africa to install flue-gas desulphurisation (FGC) to remove sulphur oxides (SOx) from exhaust flue gases.
The search for the most environmentally-friendly solutions not only included the production of electricity itself (once the electricity will be running through the high voltage lines), but was also a concern long before the opening of the power station.
The island of Saadiyat off the coast of Abu Dhabi in the United Arab Emirates is expanding to become a cultural center for locals and tourists. The "Louvre Abu Dhabi“, the first of several museums, will be constructed by 2015. The ambitious project from the French star architect Jean Nouvel will have a large white dome with a diameter of 180 meters that covers the building like a canopy of foliage. Since the entire complex will be in the water, the sealing system in the subsoil will be of significant importance.
Sophisticated system design
The Abu Dhabi Louvre will be surrounded by water. The grounds will not be flooded until after the completion of the construction. Therefore, protecting the cement foundation is the highest priority. To ensure water-tightness, a two-layered system was selected. A 1.6 mm thick Sikaplan on a TPO basis will be used as the lower geomembrane. The two meter-wide geomembrane is connected with the TWINNY S welder from Leister. This machine welds a double seam with its special nozzle. This way, after the welding process, the water-tightness can be tested in the groove created between the seams using a testing needle and compressed air.
The Niayesh tunnel project is the largest ongoing civil engineering project in Iran. Tehran›s urban tunnel, 10,252 m long, is the second longest tunnel in Asia for auto traffic, after the Baotashan urban tunnel in China which is 10,480 m long.
Built in the shortest time
Two main traffic arteries on multiple levels including ramps and loops were built in Tehran. When the entire project is finished, the traffic situation in the Niayesh section of the city should be decongested and the primary traffic route along the east-west axis transferred. There is also the promise of «a positive change in the city and an improvement in the standard of living» (project text). The tunneling rate was 18.5 m per day and the entire volume an impressive one million m3 ! At times, 5000 people were at work on the project. For the main Niayesh tunnel, 245,000 m2 of geomembrane were built in, of those, 195,000 m2 were single layer PVC sheeting and 50,000 m2 HDPE geomembrane, both 2 mm thick. The entire geomembrane work here lasted only around six months.
The globally-active Swedish furniture giant IKEA now even has a few branches in the Middle East. After Saudi Arabia and the United Arab Emirates, IKEA opened a new sales point north of Doha, the capital city of Qatar. The 32,000 square meter (105,000 square foot) building was constructed in just 12 months. On the outside it wears the same typical blue & yellow IKEA branding as with all other 300 branches worldwide. However, the structure in Doha is different in one special respect: a giant reservoir tank has been built here, in which water from the surroundings is collected. It stores the valuable fluid so that it can be used later, after filtration, for irrigation.
Construction of the NEAT (German acronym for New Rail Alpine Crossing) project represents a further step in regard to Switzerland’s integration in the growing European high-speed network. The core is the Gotthard base tunnel, which at 57 km will be the longest rail tunnel in the world. It will comprise two single-track tunnel tubes. Construction is simultaneously in progress on five partial sections of different lengths, so as to optimize the construction time and costs. The costs for this gargantuan project are estimated to be around 9.8 billion Swiss franks (approx. 6.5 billion euros). The construction time will total 20 years. The historic breakthrough of the tunnel occurred on 15th October 2010 and the grand opening is planned for 2016.
The Qatar National Convention Centre, one of the world’s largest construction projects, is currently underway in Doha, Qatar. Upon completion, the 100,000 square meter structure is expected to be a venue of choice for regional and international conventions, exhibitions, gala events, concerts, weddings and banquets. This bold design incorporates a three-story car park underneath the modern four-story building.
Crystal Lagoons Corp.’s concept and technology enable to build crystal clear water bodies in almost unlimited dimensions thanks to its uniquely new and patented concept. In a region where the sea is too rough and thus unattractive to tourists, it is now possible to construct giant artificial lagoon landscapes. There are already several of these pools in the world. One of them is situated in Las Brisas de Santo Domingo, Chile. But the world's largest one can be found in San Alfonso de Mar. It covers an area of 8 ha. In fact, Crystal Lagoonsa Corp. managed an entry in the Guinness Book of Records with it in 2007. The longest distance stretches for more than 1 km. You can actually see it on "Google Earth". An even bigger basin with an impressive 12.5 ha area of crystalline water is currently taking shape in the Egyptian resort of Sharm El Sheikh.