Iron ore
industrial art application
Shenxiang column mill ultrfine crushing works in medium-speed and medium-pressure with continuous repeated material bed pressurized grinding, couples of rollers crush and grind metal ore quickly in the conical linear, making sufficient dissociation of usefull mineral and gangue when they are still macrograin, thus reaches ideal separating effect. The production effect can arrive 40-2000t/h per machine.
China is short of iron ore sources, and most of iron ore are lean or grandidierite with disseminated grain size, resulting in a certain difficulty in dressing activity. The existing production capacity of beneficiation processes and equipment is small, but with high power and steel consumption, low pressing efficiency. Therefore, an urgent need is laying there for us to promote the efficient development and utilization of poor iron ore resources by advantages of science and technology promotion, advanced technology and equipment.
Coarse tailing discharging pre-concentration process of column mill is developed by Changsha Shenxiang Universal Machine Co. Ltd and Changsha New Technologies Dressing Engineering Institute. The iron ore been ultrafine crushed, pre-concentrated and coarse tailing discharged before it is sent into the ball mill. Thus can improve grade of rough concentrate, decrease quantity of rough concentrate need to be grinded. It can greatly improve the production capacity of the griding system, lower power and steel consumption, significantly improve the concentrate grade and resource recovery rate. Particularly has great significance for the development of depleted iron ore resources.
1. Coarse tailing discharging rate 40%-70%
2. Improve production capacity of ball mill 40%-60%
3. Improve metal recovery 5-15%
4. Increase the concentrate grade 1-2%
5. The coarse tailing can dry heap, filling or sell as building sand, reduce thetailings dam storage capacity of up to 40% to 70%.
6. Dry cast and dry separation in no water or less water areas
7. Reduce investment more than 50% in new pressing plant, increase production ability to 200-400% in past pressing plant.
8. Economizing electricity more than 50%
9. Profits and taxes of processing plant increase 100% to 400%
Scope of application: 1. all kinds of iron ore and nonferrous ore, 2. lean ore, 3. ultrafine lean ore, 4. magnetite which’s original grade more than 45% (without milling, coarse tailing direct access to high-quality iron ore concentrate)
1. Great improvement of the systemic grinding capacity
By using coarse tailing discharging pre-concentration process of column mill can discharge more than 30% tailing before iron ore into ball mill (shown in table 1). Meanwhile, decrease the ore’s partical size and make it have a sufficient dissociation. Thus greatly improves the production capacity of the ball mill. Practical application indicates that new technology can improve the grinding and pressing production capacity more than 70% than original technology.
2. High beneficiation efficiency
By using coarse tailing discharging pre-concentration process of column mill can increase the concentrate grade 2-10%, improve metal recovery rate 5-15% (as shown in table 1). Comparing with other crushers, it has small discharge particle size and reasonable size distribution (shown in table 2), well separating effect, higher range of coarse tailing discharge, higher efficiency in beneficiation (as shown in table 1).
3. Good economic benefit
The introduction of coarse tailing discharging pre-concentration process of column mill really realizes “more crushing, less grinding”, reduces investment for grinding and dressing, increases the concentrate grade and resource recovery rate. It is of great significance for promotion of dressing plant’s economic benefit.
