Optimization Test of High Pressure Roller Mill System in an Iron Mine of Anhui
In order to improve the treatment capacity of a concentrator in Anhui Province,two differ-ent schemes of high pressure roller mill system optimization test were carried out with medium crushing products with total iron grade of 35.17%as samples.All the medium crushing products were pre-screen-ing-screened onsize dry separation-roll mill test.The pre-screening test results of different sieve sizes showed that the less the fine particle size in the ore feeding,the more favorable it was for the new genera-tion of-5 mm particle size products.When the pre-screening sieve size was 5 mm,the content of the newly generated-5 mm particle size was the highest,up to 57.99%.The high-pressure roller mill test results of pre-screening of middle crushing products-dry separation of screened onsize products combined with un-screened ore feeding show that with the decrease of the separation ratio of middle crushing products,the con-tent of-5 mm particle size in roller feeding decreases,and the content of newly generated-5 mm particle size increases.When the ore separation ratio is 3∶1,the content of the newly generated-5 mm fraction is the highest,which is 45.36%.The comparison of test results shows that the test scheme of all pre-screening-screened onsize dry separation-roll grinding has the best index.Compared with the medium crushing prod-uct directly subjected to high-pressure roll grinding,the content of the newly generated-5 mm fraction is increased by 25.47 percentage points.
high pressure roller millpre-screeningdry separationmagnetite
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