Based on the production demands of millions of customers, ZENITH has developed the industrial milling machines which cover fully the crude powder, fine powder and ultrafine powder. The tens of years of customer service experiences make ZENITH learn better the customer's investment ideas and considerations so as to provide specific solutions.
Iron ore beneficiation begins with the milling of extracted ore in preparation for further activities to recover iron values. Milling operations are designed to produce uniform size particles by crushing, grinding, and wet or dry classification. The capital investment and operation costs of milling equipment are high. For this reason, economics plays a large part in determining the use of comminution equipment and the degree of crushing and grinding performed to prepare ore for further beneficiation. Other factors considered in determining the degree of milling include the value concentration of the ore, its mineralogy, hardness, and moisture content.
Milling is a multistaged process and can be divided into several stages. Typically, primary crushing and screening take place at the mine site. Primary crushing is accomplished by using gyratory and cone crushers. Primary crushing yields chunks of ore ranging in size from 6 to 10 inches. Oversize material is passed through additional crushers and classifiers to achieve the desired particle size. The ore is then crushed and sized at a secondary milling facility. Secondary milling further reduces particle size and prepares the ore for beneficiation processes that require finely ground ore feed. Secondary crushing, if necessary and economical, is accomplished by using standard cone crushers followed by short head cone crushers. Gyratory crushers may also be used.
The choice of grinding circuit is based on the density and hardness of the ore to be ground. Although most taconite operations employ rod and/or mill grinding, a few facilities use autogenous or semi-autogenous grinding systems. Autogenous grinding uses coarse pieces of the ore itself as the grinding media in the mill. Semi-autogenous operations use metallic balls and/or rods to supplement the grinding action of the ore pieces. Autogenous grinding is best suited to weakly cemented ores containing some hard material. The benefit of autogenous grinding is that it is less labor and capital intensive. Semi-autogenous grinding eliminates the need for a secondary crushing circuit. Rod and ball wear, the principal maintenance cost of traditional grinders, is also eliminated with this method.
At zenith, there are many kinds of milling equipment for sale in a iron ore milling plant. For example, if you have iron ore to process and crush, you can always choose our jaw crusher, impact crusher, cone crusher, ball mill, vertical roller mill, super thin grinding mill and so on as an option. For more information, please do not hesitate to contact us. Our online service is 24-hour available for you and free of charge. So, whenever you need help, click the quotation button to let we know.