Industrial sustainable development
Considering the importance of protecting the environment, as well as the water crisis in iron ore mining areas, reducing water consumption and power consumption, the evaluation plan for the construction of a combined dry and wet concentrate production plant was defined with the following goals:
Maximum reduction of water consumption per ton of produced concentrate
Feedability in the range of magnetite and hematite feeds
The ability to use low grade stones and mining tailing as feed
Reducing harmful environmental effects
Reducing the required power consumption in the grinding section due to the combination of HPGR and special magnetic separation and finally reducing the total power consumption per ton of produced concentrate
Achieving concentrate production technology by hybrid combination method
Reduction of pellets consumed per ton of concentrate produced
Removing most of the tailing in dry form
Reducing the cost of investment in the dewatering sector
Using this method, in addition to significantly reducing the amount of water consumption, which is one of the most effective parameters in the production of concentrate in most regions of the country, it also reduces the amount of energy and bullets.
According to the tests carried out, the tailings sample of the second stage of the crushing and granulation lines of the placer is one of the most potential samples for the production of concentrate in this way.
In the dry part and in one separation step, this sample reaches from 48.7% to 5.62% with iron recovery equal to 4.94% and weight recovery 56.73%. The resulting waste grade is also 10.3%.
Another sample on which the processing tests were performed was the tailings of the crushing and granulation line, which due to the high grade of the tailings with a magnetic separation stage, it was necessary to use a scavenger separator to reach the final grade of the tailings to 13.3%. . The grade of the primary feed increased from 26% to 5.43% after a crushing and pre-processing step, and then in the dry cobbing line, the product grade was equal to 2.60%. In this stage, hen recovery was equal to 11.89% and weight recovery was equal to 39.64%.
The use of the second magnetic separator in the role of a buffer leads to an increase in the load in the circuit and a decrease in the feeding capacity of the line with fixed equipment, or an increase in the need for initial investment to achieve the same production rate, of course, it is also possible to Different samples can also be imported into the line as feed.