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A Rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process.The rotary kiln consists of a tube made from steel plate, and lined with firebrick. The tube slopes slightly (1–4°) and slowly rotates on its axis at between 30 and 250 revolutions per hour.
Rotary kiln is also referred to rotate calcination kiln, belongs to construction material equipment. Rotary kiln can be pided into cement kiln, metallurgy chemical kiln and lime kiln according to different materials. Cement kiln is used for making of cement clinker and there are dry and wet methods to make cement. Metallurgy chemical kiln is used in metallurgy industry and ironworks for lean iron ore, chromium ore and ferronickel ore calcination, which is used for calcining of high aluminum vandal ochre in refractory material industry; for calcining of calotte and aluminum hydroxide in aluminum manufacturer; for calcining of chrome sand ore and chrome powder ore in chemical plant. Lime kiln are used for calcine dolomite and active lime which is used in steel plant and ferroalloy factory.
Rotary kiln is a pyroprocessing device, which is mainly used to raise materials to a high temperature in a continuous process, as the common saying – calcinations. It is usually used with the material as follows: cement, lime, refractories, metakaolin, titanium dioxide, alumina, vermiculite, iron ore pellets，etc. According to different material, the rotary kiln can be divided into three types, cement kiln, metallurgy kiln and limestone kiln. The cement kiln is mainly used for calcimine of cement clinker; usually, it has two types — wet and dry. The metallurgy kiln is used in metallurgy industry and ironworks, such as lean iron ore, chromium ore and ferronickel ore calcimine. The lime kiln, also named active lime kiln, is used for roasting the active lime which is used in steel works and ferroalloy works, and calcined dolomite. symons cone crusher:http://www.hx-crushers.com/p13.html
The purpose of the refractory lining is to insulate the steel shell from the high temperatures inside the kiln, and to protect it from the corrosive properties of the process material. It may consist of refractory bricks or cast refractory concrete, or may be absent in zones of the kiln that are below around 250°C. The refractory selected depends upon the temperature inside the kiln and the chemical nature of the material being processed. In some processes, such as cement, the refractory life is prolonged by maintaining a coating of the processed material on the refractory surface. The thickness of the lining is generally in the range 80 to 300 mm. A typical refractory will be capable of maintaining a temperature drop of 1000°C or more between its hot and cold faces. The shell temperature needs to be maintained below around 350°C in order to protect the steel from damage, and continuous infrared scanners are used to give early warning of ‘hot-spots’ indicative of refractory failure.
Henan Hongxing Mining Machinery Co., Ltd. manufactures various equipments for whole set of stone production line, and provide complete technical support for customers. The whole production line consists of stone crushing line, powder making line, sand making line and ore beneficiation line. We design different production lines ranging 50 t/h to 500 t/h by combining different models of equipments also matching cone crusher, deduster, etc. It is widely used for crushing hard limestone, granite, basalt, gravel, metallurgic slag, etc or artificial sand making for hydroelectric power, building material, high way, city construction, etc. Different models of equipments are combined to meet different customers’ demands according to different craft requirements.
As the professional manufacturer of complete sets of mining machinery, such as artificial sand washer, Henan Hongxing is always doing the best in products and service.
Due to the fierce competition and the depressed market, the development of industrial machinery continues to stall. However,with the recovery of dom estic economy and the support of national policy, mechanical equipment manufacturing industry will face a new round development.
Since there are few large-scale modern enterprises in China, crusher industry have to learn the advanced experience of foreign countries. On the other hand, they should try to avoid the old path abroad and pay attention to innovation. Through integration and restructuring, domestic crusher processing can find a relatively important spot in the market. As the core equipments in construction, mining equipments continuously support a large number of basic industry products in mining, traffic, energy and building industry, which largely ensuring the development of national economy. However, elements like inefficient management and small capacity scale obstruct the development of crusher industry.
At present, the domestic mining equipments industry already has several mature equipments, such as grinding machines, crushing equipments, sand washing machines and sand making machines. Some mining equipments company in mining market are on a small scale. Large numbers of enterprises have inefficient management, which result in excess production capacity in domestic mining equipment industry. If the situation go on like this, not only these companies can't survive but also would bring troubles to our mining equipment industry. As we now focus on energy saving and emission reduction, there should be new products to meet the requirements.
With the development of domestic economy, especially for the continuous progress of engineering construction, mining and steel industry, there's a constantly increasing demands for construction equipments. Products likejaw crusher, impact crusher have a great market demand. Since crusher is necessary equipment in mining machinery and is an essential part in crushing different kinds of ores raw materials. Therefore, crusher is getting more and more importance in the market.
The expansion of domestic demands and the development of international market, not to mention, the rapid growth of machinery manufacturing industry, will all contribute to the success of crusher industry. Machinery manufacturing enterprises are making a more aggressive push into the market. It is believed that the future development of machinery manufacturing industry will be better. When we try to looking into the future of domestic economic progress, especially with the acceleration of urbanization and industrialization, new opportunities will certainly arise. It is a great chance for manufacturing enterprises to improve their manufacturing technology and try to develop and manufacture products with high quality. cement making machine:http://www.hx-crusher.com/cement_production_line.html
sand washing equipment:http://www.china-mills.com/p9.html
With the recovery of domestic economy, our country have to quicken the process of western development, urbanization construction, traffic facilities construction and water conservancy facilities construction. These measures will surely expand the demands for raw materials, such as cement, sand and so on. As a result, it will stimulate the overall progress of crusher industry. Therefore, the key point is to develop crushing equipments with the advantages of high efficiency, energy saving, environmental protection. It is critical for crusher manufacturing enterprises to open up a new market to meet the demands of our times.
With more than 20 years experience of production, Henan Hongxing is a professional crusher manufacturing enterprise. Aim for innovation to brand themselves. They always pay attention to real-time dynamics and the needs of different customers, on this basis,they have launched a series of crushing equipments possess high technology, superior quality and outstanding performance. There will be a new boom of economic investment, upstream and downstream industries will enter into a golden age of development. If crusher industries want to survive in the intense competition, they must seize the opportunity and continue to innovate and develop. It's better for them to explore broader market and brand themselves.
As the professional manufacturer of complete sets of mining machinery, such as flotation cell, Henan Hongxing is always doing the best in products and service.
The passage of a new securities law through Mongolia’s parliament is causing concern to managers of the country’s exchange. “We’re hoping that the parliament will pass the bill during the spring session,” the Mongolian Stock Exchange’s (MSE) chief financial officer Tushig Dul told Mining Journal. “However, the parliamentary elections are due to take place in June this year, and MPs have other critical issues which need to be passed too. So our concern is whether the bill will be included in those which are passed before the election.” The exchange has been attracting international mining companies seeking a secondary listing in the mineral-rich state. Mr Dul said that around 20% of actively trading companies on the exchange are from the mining industry, with mining stocks comprising around 50% of overall trading volume.
Companies including Winsway Coking Coal Holdings Ltd and SouthGobi Resources Ltd were interested in joining the exchange. It remained to be seen whether Aluminium Corporation of China Ltd, which has recently taken large stakes in both companies, would itself seek a listing in Ulan Baator.
“Keep an eye on Mongolian capital market developments – it’s mostly all about mining,” said MSE chief executive Altai Khangai. “There are about 50 internationally listed mining companies with Mongolian operations, which are interested in listing in Mongolia to get exposure to local shareholders and local currency. We’re also seeing Mongolian mining companies interested in growing domestically through the stock exchange.”
“For that we need sophisticated market infrastructure and a proper legal environment”, he added. raymond mill:http://www.hx-crushers.com/p54.html
The proposed law seeks to reduce the burden on companies seeking to make a secondary listing by removing the need for registration in Mongolia, and the need for compliance with both Mongolian and home-country securities legislation.
It further attempts to align the new regime with an existing law that requires that at least 10% of stock in ‘strategic’ mineral deposits be traded on the MSE.
Recent reports suggest that an anticipated US$3 billion initial public offering by Mongolian coal producer Hongxing Machinery specializing in manufacturing sand maker would now be delayed until 2013.
The company had proposed a triple listing on the MSE, London Stock Exchange (LSE) and Hong Kong Exchange, but its plans remain stalled as Hong Kong will not accept listings from Mongolian companies until the new law is passed.
“Erdenes Tavan Tolgoi’s next steps are all related to the new law,” said Mr Dul. He noted that the state had distributed 20% of the company’ stock among the citizens of Mongolia, to be traded on the exchange.
Mr Khangai said the MSE and London Stock Exchange were progressing with a partnership aimed at modernising Mongolia’s trading infrastructure, with a new cross-trading platform to be launched in the next two months.
An iron ore trading platform made its China debut on Tuesday as the world's biggest buyer of the commodity sought to enhance its price-setting influence. Trading volume is expected to reach approximately 100 million tons by the end of this year. This will account for about 14 percent of China's annual iron ore beneficiation imports, said Xu Xu, chairman of the China Chamber of Commerce of Metals, Minerals & Chemicals Importers & Exporters, one of the organizers of the platform. Just a few minutes after its official launch, the platform saw its first transaction with 165,000 tons sold for $145 a ton, including freight. This was in line with market expectations, analysts said. The platform will not only help ensure supplies for China but will also benefit global ore trading, Su Bo, vice-minister of industry and information technology, said.'The platform will help stabilize prices,' Su said. Nearly all ore sold to China is based on spot prices, with the industry evolving over the past two years after four decades of pre-set annual contracts.China, with a leading role in the market, has long argued that it should have a greater say in pricing.
The platform helps it wrest some control from top miners such as Vale, Rio Tinto and BHP Billiton. Zhang Lin, senior researcher of Lange Steel Information Research Center, forecast that the platform will come into its own when it can attract about half of China's imports. Top international mining conglomerates, along with major Chinese steel producers including Baosteel, Hebei Steel and Wuhan Steel, have all signed up as members of the electronic platform operated by China Beijing International Mining Exchange. As the world's biggest ore importer, China accounts for about 60 percent of the global market. The platform has been undergoing test runs since the beginning of the year. 'On the face of it, it is a recipe for success,' said Rory MacDonald, broker at Freight Investor Services. 'But the system must stand up and the system must be seen to perform.'
The exchange said the platform will offer contracts settled in US dollars and yuan. Cargoes that can be traded include those sitting at bonded warehouses, being transported at sea or stacked in domestic ports as well as futures, ore that has yet to be mined. The exchange will charge a commission fee for both buyers and sellers of 0.125 yuan or $0.02 per ton. Various grades as well as lumps, are tradable, with iron ore benificiation content ranging from 52 percent to 67 percent. Pellet and concentrate can also be sold.The exchange has said banks and financial firms would not be allowed to participate in a bid to stem speculation, and there will be no trading of derivatives. Currently, trading in the spot market for seaborne cargoes is done directly between buyer and seller. Global miners e-mail or fax prospective buyers whenever they sell cargoes via spot tenders, a system deemed efficient and free of broking fees. jaw crusher:http://www.hxjqchina.com/product-list_11.html
Traders say unless China offers incentives, such as tax rebates or commission discounts, they are unlikely to migrate to the platform anytime soon. Trading hours are 9:30 am to 3:30 pm (1:30-7:30 am GMT) with a two-hour break from 11:30 am. The benchmark trading price will be set based on the previous day's average transaction price. The platform has more than 150 companies as members so far. Angang Steel, which is a member of the platform, will put up to 30 percent of the company's iron ore for trade on the platform, said Li Daguang, deputy general manager of Angang Group International Trade Corp. Foreign miners were adopting a wait-and-see approach. 'It is still too early to predict how much iron ore we will put into the platform for trade,' said Luiz Meriz, president of Vale Minerals China Co Ltd.
'However, it has created a new way to look at ore prices, which is the key point of the platform and we are very happy to see that.' Vale Limited, the world's biggest iron ore producer, still sells its products to Chinese clients mainly via long-term agreements, but the platform will allow Vale to meet small-scale Chinese steel producers, Meriz said. 'We believe the new system will bring more transparency because prices are not created by the platform, but reflect real transactions,' he said. 'So, we are very supportive.' The China Iron and Steel Association has blamed 'monopoly practices' by foreign miners for the surge in costs, and sees the new platform as a way to keep costs lower.