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Xinhai EPC provides services of samples test, mine design, equipment manufacture, etc. for clients, and solves the common problems in plant construction such as budget over-run, schedule delays, unqualified equipment, unclear recovery efficiency, disputes of the manufacturers, and unclear responsibility of after-sale service
Flotation process can achieve ideal separation effect, and separately recover low-grade ore then enrich multiple high-grade concentrates. Different ore properties means different flotation process. According to the dissemination characteristics of metal minerals, Xinhai has determined four kinds of flotation processes.
Ferrexpos Poltava Mining subsidiary has been on a journey to both stimulate demand for iron ore pellets and increase the Fe content of its product. The crushing and flotation technology of Metso has played a key role in this evolution, according to Alexey Strikha*.
In 1960, the exploration of Kremenchug magnetic anomaly started on the left bank of the Dnieper River, Ukraine. At that time, the foundation of the future Poltava Mining refinery was laid, and, 10 years later, the plant produced its first batch of concentrate.
There were several phases of plant construction: in 1980, after launching the pelletising plant, the company presented a new type of product to the market iron ore pellets. To stimulate the demand for this product, the company needed to improve the products quality, ie increase the iron content in the concentrate.
Keeping this in mind, the companys managers decided to upgrade the ore pre-treatment operations: reduce the fragmentation size to cut the costs of further ore degradation. Due to space constraints at the crushing plant, the company was in need of new equipment with the exact dimensions of the current foundation structures. At that time, Svedala (acquired by Metso in 2001) engineers suggested testing the Barmac vertical shaft impact crusher.
The conventional crusher-based closed cycle of check screening was not an option for us, so we were offered inertial crushers for coarse lumps. And this proved to be a good technical solution, said Vladimir Khovanets, Chief Concentrating Engineer at Poltava Mining.
Alexander Lysenko, Poltava Minings Chief Technical Officer said: Metso always does lots of research and testing to offer us an integrated solution, i.e. technology that gives us exactly what we want.
After the pilot testing, the middle and small fraction crusher lines were upgraded with Barmac crushers. That project was a success, so both companies decided to expand further joint activities: two double-drum separators were installed instead of eight locally manufactured triple-drum separators with no loss in productivity.
Two methods are used for concentration of lean ores: magnetic and flotation concentration. During the engineering study of these methods, Metso installed a pilot plant with laboratory mills, flotation cells, magnetic separators and hydrocyclones.
Igor Grebeniuk, Regional Sales Manager at Metso, said: The pilot results proved that 67-68% Fe content in the pellets manufactured from Poltava Mining ores was quite possible after the flotation upgrading.
In 2002, the company launched Flotation Plant 1 equipped with Metso RCS130. It was the first project in the former Soviet Union to use flotation upgrading in the ferrous industry. Keeping this in mind, the engineers at Poltava Mining ran a detailed preliminary analysis of the new technology, studying the cases of Metso equipment supplied to the concentration plants in the USA and Canada.
Khovanets recalled: While working with Flotation Plant 1, we gained the insight that Flotation Plants 2 and 3 need to be constructed for the strategic development of the company. And conventional drum mills were not so good for that process.
Metso engineers suggested Vertimill for high-quality and fine milling of the product. In coordination with Ferrexpo engineers, a concentration line with vertical mills for all flotation cells was developed.
Khovanets said: After magnetic concentration, we get about 85-89% of below 44 microns grade. Vertimill machines help to bring up the fineness of grinding, ie up to 90% of ground materials are minus 33 microns.
Vertimill machines offer a new design. A conventional drum mill operates in the horizontal position, while Vertimill is installed vertically. The space needed of such equipment is much smaller, and it provides proper crushing grade.
Two additional flotation cells were commissioned in 2014. These additional cells gave a step change in the concentration technology. Today, ore from different fields is processed separately at Flotation Plants 1 and 2, while Flotation Plant 3 is used for iron recovery from froth.
Lysenko said: Before commissioning the plant, we produced pellets with 62% Fe content. Due to flotation upgrading we now have 67% concentrate, and this brings the products quality to a new level. I mean pellets with 65% Fe content.
Introduction of the new iron ore concentration technologies entails upgrading the next downstream process, namely filtration. After the equipment upgrade, it will be possible to reach the maximum dehumidification of concentrate to gain additional quality.
A tough market requires high-grade product rich in iron and with minimum impurities. After the process upgrade, Poltava Mining was able to improve the pellet quality, which also means more investments in the infrastructure of its hometown.