| Along with nickel industry of the world is developing rapidly,the price of nickel has been on a steady upward trend.Particularly in the nickel stainless steel industry considerable amount,with the increase stainless steel production,the Chinese market for nickel demand will increase China needs the nickel about two-thirds are used for the production of stainless steel,this year will need 0.53 billion tons of stainless steel to2010 will be over one billion tons.Currently,China is already the world's largest user of stainless steel in the past year,China's demand for nickel ore prices rose thirty percent,this year the demand for nickel will be increased by twenty percent to two hundred thousand tons.In the face of huge market demand for nickel,the current domestic sources of nickel sulfide is still the vast majority of nickel ore,nickel sulfide ore is also facing a shortage of difficulties, how to ease the situation will be becoming very important.Silicate nickel ore for the development and utilization is still a lot of vacancies,due to the type of ore containing low-nickel ore complex composition,weathering a serious phenomenon and so the decision to deal with this type of nickel silicate minerals process is very complex,the cost is high, So far have not been reasonabley exploited.Therefore,the issue of developing technics to silicate nickel ore of somewhere of Yunnan is of great realistic significance.Against this issue is a particular area of Yunnan silicate of nickel ore beneficiation pilot study the region nickel silicate minerals are classified into two types:Limonite-type silicate nickel ore containing Ni-0.88%.Co-0.056%,Serpentine-type nickel silicate ore containing Ni-0.78%,Co-0.031%.Through the process of ore mineralogy studies and the exploration,research shows conventional magnetic separation,gravity separation,reducing roasting-magnetic separation processing of this type of nickel silicate ore can not get good beneficiationa index.Segregation-magnetic separation technics was used to two types of silicate nickel ore for a large number of test conditions,and got the test integration technics conditions, Limonite-type silicate nickel ore can get nickel concentrate products index:nickel grade of 5.20%～5.25%,nickel recovery of 85.65%～86.78%;cobalt grade of 0.27%～0.28%, cobalt recovery of 79.84%～80.62%;Serpentine-type nickel silicate ore can get nickel concentrate products index:nickel grade of 4.86%～4.89%,nickel recovery of 86.36%～86.43%;cobalt grade of 0.21%～0.22%,cobalt recovery of 84.18%～85.43%.On Segregation-Magnetic chemical analysis of nickel concentrate reveal silicon, magnesium,aluminum,and other high impurity contents in the metal smelting process,in particular the high content of magnesium smelting will bring certain negative impact, although through smelting slag making a reasonable balance in the process of acidity,but with a larger operation the difficulty,if we can reduce the smelting between impurities in the product content,it is bound to be very important.Therefore,we choose R&D SY-leaching agent on Segregation-magnetic separation from the leaching of nickel concentrate to drop miscellaneous test study.As mentioned above,the use of Segregation-magnetic separation processing in the region nickel silicate minerals is rather reasonable;over the years particularly nickel silicate ore using only conventional chlorination agents can not get good beneficiation index,but in the process of segregation joined a self-developed chlorinated agents,additives and catalysts,Improve nickel chemical reaction in the process of segregation but improve the beneficiation index.Deficiencies department of ore prices are not separate elements cobalt as cobalt concentrate recycling,the follow-up to the smelting process to be isolated from the same time,another the comprehensive utilization of the tailings of magnetic separation do not go on the detail deep study. |
PDF Full Text Request