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Astra Resources to begin dredging at iron sands project in the Philippines

新闻稿   •   2012年07月25日 08:25 CST

Astra Resources has announced plans to begin dredging at its iron sands project located in Cagayan, the Philippines, later this year. Astra's subsidiary, Astra Philippines, holds a 90% stake in Cagayan River Construction and Development Corporation (CRCDC), which will deliver the project. Astra CEO Jaydeep Biswas said the commencement of the project was pursuant to a memorandum of agreement between the CRCDC and the Provincial Government of Cagayan, which was approved last week. "This grants CRDCD the authority to dredge, extract and utilise 'quarry resources', sand particles and other materials of commercial value such as magnetite iron sands from the Cagayan River Delta," said Biswas. The Babuyan Channel Iron Sand Lode, in the north eastern part of Luzon in the Philippines, is estimated to contain more than 31.3 billion metric tonnes in the Mineral Production Sharing Agreement (MPSA) areas. Astra managing director Silvana De Cianni said the company is acquiring additional mining areas alongside MPSA 1, 2, 3 and 4 to add to the joint venture. The company will dredge a 200m by 12km strip along the mouth of the Cagayan River for a period of 25 years. Production is expected to reach gross sales of around 1 million tonnes per annum by 2014, and the initial estimated resource is 135 million tonnes. Astra,rotary kiln,ball mill,Mineral Processing through its joint venture interest in CRCDC, has secured all permits to initiate operations this year .

Direct Preferential Flotation
Definition of this method is: separate various helpful minerals in proper order. With its feature of high flexibility, it can adapt the change of ore grade, especially for sulphide ore of high grade. Xilin, Fankou, Lechang lead-zinc dressing plant of our country, and Laisvall lead-zinc dressing plant of Sweden all adopt this method.

Combined Flotation Flowsheet
Firstly, get mixed concentrate through the emersion of all useful minerals in ores; secondly, separate various helpful minerals in sequence from mixed concentrate. These two steps together are called part of amalgamate flotation Flowsheet. This process is suitable for treat raw ores of complex structure, fine embedded grains, and low content of sulfide mineral, which are in close symbiosis relationship. Because this process can simplify process, reduce ores’ over grinding, so as to benefit separation. Almarc Lead-zinc plant of former Soviet Union adopts preferential flotation this process. By using this process, we can get higher index than preferential flotation improve 10% of lead concentrate ore grade and 4.5% of zinc concentrate ore grade, raise the rate of multipurpose utilization from 75.4% to 83.7%, and double labor productivity. Qingchengzi zinc-lead ore dressing plant and Xiaotieshan copper ore dressing plant of our country adopt this process.

Part of Amalgamate Flotation Flowsheet
We can get mixed concentrate by the emersion of two useful minerals in ores together, then separate single concentrate from the mixed concentrate. The two stages together are called part of amalgamate flotation Flowsheet, which is the most widely used process in production. It is quite economical to adopt this process when raw ores contain low-grade nitrogen, copper-lead, copper-zinc, and lead-zinc.

Iso-flotability Flotation Process
According to minerals’ flotability in ores, mineral assemblages of good, medium and worse flotability are separated through flotation separation. Secondly, different helpful minerals are selected out from all mixed concentrates, which is called iso-flotability flotation process. For example, Huangshapinng lead-zinc ore dressing plant of our country, and Zheskaz of former Soviet Union both adopt this process. beneficiation,Mineral Processing,rotary kiln