Paper Information

Title: 

INVESTIGATION ON THE CAUSES OF ELEVATED AMOUNT OF FINE PARTICLES IN CHOGHART CRUSHING UNIT PRODUCT AND THE METHODS OF REDUCING THEM

Type: PAPER
Author(s): TABATABAEI ABAS*,YOUSEFI ALI ASGHAR,HEKMAT A.
 
 *AMIRKABIR UNIVERSITY OF TECHNOLOGY
 
Name of Seminar: PROCEEDING OF IRANIAN MINING ENGINEERING CONFERENCE
Type of Seminar:  CONFERENCE
Sponsor:  IRANIAN SOCIETY OF MINING ENGINEERING
Date:  2005Volume 1
 
 
Abstract: 

One of the main problems of mine crushing unit in Choghart iron ore, is the increase amount of under 6cm particles, in the processing plant's product. In order to remove this problem in short time, studies have been done includes mineralography, crushing and determining the size distribution on the blasted ore. Mineralogical studies showed that the main iron ore is magnetite and waste minerals such as calcite, talc and titanite surrounded it.  The ore was weak and breaks under small pressures.
Crushing studies showed that the ore crushibility was reduced more than 30 percent. Breakage function which was determined with BFDS software showed that the iron ore generates slime and waste particles and magnetite which involves with it. Transfer to fine part simply due to crushing. Determinination of size distribution of ore by Goldsize software on the blasted ore of four extraction block in Choghart iron ore, demonstrated the fact that more than 80 precent of the feed which enters the crushing plant is under 30 cm and more than 60 percent of it is under 18 cm which is equal to jaw crushing plant's size distribution product. So, it became clear that 80 percent of the feed which enters the crushing plant, doesn't need to be crushed in jaw crushing plant and can be enter to the next step of the circuit. It is suggested that with installation of one steepy grizzly with operature of 30 cm, particles could be separated and entered to the next step. This will hinder the production of under 6 cm particles in addition to reduce working hour and energy consumption of jaw crusher.

 
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