Wet magnetic pre selection makes a breakthrough

Wet magnetic pre selection makes a breakthrough

Red Star mining company ore dressing factory used stage wet type mill mine magnetic selected technology. As for lower grade of rough fine mine, we used two sets one stage and one set two-paragraph ball mill, forming of "Two Vs one" grinding mine process. After grinding and wet type magnetic selection, the ore grade above 25% of rough mine will eventually be processed into iron fine mine grade above 66. 0%, whose production cost is less than 200/t concentrates. Beijing Technology University did beneficiation technology experimental study on super lean magnetite ore in Hebei province. Study finds that rough ore is grinded to 2mm, which will abandon 75. 66% qualified tailings after wet pre-selection. In this way, only one-fourth of the original ore reserves for subsequent processing work, so that it greatly reduces the subsequent operational load. Rough milling adopts cylinder sieve and grinding machine, and the two constitute a closed circuit, mill productive capacity improved by 2.9~3.8 times. And the grinding unit energy consumption greatly reduced.

When gangue mineral disseminated is relatively fine granularity, ore can be broken into smaller ones, and we use wet magnetic separation treating tail. Red Star mining company did research to ore, many study results demonstrate that, coarse ore (refer to over 10 mm size) pre-selection parabolic tail effect is extremely poor, It only treats 1O% tailings when using dry magnetic separation, the grade is less 2%. Moreover, magnetic iron loss rate is more than 3%. Thereby, dry magnetic separation only to treat coarse parabolic tail cannot eventually solve the problem. In 2004, Sinosteel mining Institute and Germany KHD Humboldt ? weida did semi-industrial test of high pressure roller mill and roller mill products sorting test. In that study, they treated 3.0 mm ore with grade of 26.27% by using magnetic roller mill pre-selection. It can cast in advance qualified tailings with output rate 47. 80%, grade 8 310/e. The research created a new situation for domestic ultra lean iron ore utilize. To achieved ore pre-selection throwing tail, significantly improve ore grinding grade as well as upgrade ore processing capacity, reduce mill selection cost, Red Star mining company has made a breakthrough progress. After in-depth exploration and repeatedly tests and research, they used high pressure roller mill machine and line Shaker, and the two form a closed circuit broken system. It will be able to crush 20.0 mm ore to 3.0 mm, and then the tailing selection will be treated with wet midfielder strong magnetic selected machine. Thus rough fine mine grinded again and finally get grade 65.00% of iron ore concentrate.