In recent years, the wet technology for extracting nickel and cobalt from iron- vanadium ore has received increasing attention due to low production costs and environmental protection compared to energy-intensive and air-polluting fire technology. In the case where both iron and aluminum are dissolved and precipitated, the recovery of nickel and cobalt exceeds 90%. The test was carried out by a pressure leaching method, and the test equipment was an acid- injectable titanium autoclave and a sample recovery device. Test conditions: The acid accounts for 30% of the ore mass and the temperature ranges from 230 to 270 °C. The characteristics of solid products in the limonite bauxite ore and leaching process were studied by transmission electron microscopy. The results show that nickel is mainly related to the iron mineral phase, while cobalt exists only in the nickel-rich manganese structure; during the leaching process, the goethite dissolves and releases nickel, and the iron reprecipitates in situ in the form of dense hematite; The cobalt dissolves quickly and remains in the aqueous phase, after which the manganese dissolves, but the dissolution rate is lower than the cobalt dissolution rate. At the end of the leaching, cobalt-depleted manganese particles are obtained. In the test range, the temperature increase during the leaching process has little effect on the dissolution rate of cobalt, but the increase of the slurry agitation rate leads to an increase in the dissolution rate. TEM photographs of solid materials and their respective mineralogical analyses indicate that membrane diffusion is a possible rate controlling step and that the shrinkage core model can be used to explain the dissolution kinetics of cobalt.
complete 5 axis cnc machine capable of machining parts to customer specification (conventional and 5 axis machining). We can machine to print and accept the most common file formats including: .dwg .dxf .iges .step .sat as well as .pdf files.If you need aluminum parts cnc machined we are one of the most capable and affordable sources specializing in manufacturing precision machined parts on advanced 5 axis cnc machines. With over two generations of knowledge and experience, our cnc machine shop is able to produce parts that require innovative tooling and fixturing in a timely manner with competitive price. We do cnc machining on 5 axis all kinds of aluminum with 6061 and 7075 being the most used . We provide Turning and Milling, 3 axis , 3+2 axis & continuous 5 axis machining). Machining Aluminum in our cnc machine shop:
The primary tooling concerns when machining aluminum are: minimizing the tendency of aluminum to stick to the tool cutting edges; ensuring there is good chip evacuation from the cutting edge; and ensuring the core strength of the tool is sufficient to withstand the cutting forces without breaking. The tools employed for machining aluminum alloys range from high-speed steels, straight grade (K) of cemented car-bides (mainly fine grained) due to its low chemical affinityfor aluminum, which considerably improves the surface finish, and diamond-based tools. The latter tool consider-ably reduces the adherent layer accumulated on the tool edgein the chip flow direction. We use 5 axis machines such as Haas UMC 750 and Haas VF-5SS as well as conventional milling equipment (Matsuura RA-1G, MC 500V PC 2S and MC-510 VG)
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