Technologies to concentrate minerals

06.02.2012

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Technologies to concentrate minerals

The most energy-intensive process at preparation of mineral raw materials to beneficiation is the process of comminuting. It is this process that defines a final performance of concentration as far as it has been at comminuting when the opening of minerals occurs while the quantity of unopened joints of both ore and non-metallic minerals defines the quality of the final concentrate. It is obvious that if at the stage of preparation of mineral raw materials to beneficiation, just at crushing and comminuting, there have been al-ready created conditions for a selective opening of minerals then the effectiveness of the process of benefici-ation itself will increase several times.
In jaw and cone crushers, in ball and rod mills which are a traditional equipment for the most of ore-dressing and processing enterprises it is a problem to realize a principle of a selective opening of minerals because the failure of minerals in them takes place at the cost of static forces of crush, shear, attrition. At this mode of breakage a great number of joints survive which hinder the entire further process of beneficiation. Besides, this method is rather energy-intensive.
The impact mode for breaking minerals embodies a great reserve in increasing the productivity of concentrating equipment, in improving the quality of final product, in reducing energy intensity and materi-als consumption of the process of beneficiation. In impact-centrifugal crushers the breakage of minerals takes place at the expense of a free impact of the material against the impingement surface. At this mode of comminuting:
- the failure of the material is found along the micro-fissures, margins of cohesion. This implies that a selective comminuting of minerals which have a different resistance to impact takes place. The share of joints which sharply reduce the efficiency of beneficiation process is minimal therewith.
- the overgrinding of the products as well as their sliming up does not take place which is typical for grinding in ball mills; a better opening of mineral grains is attained at more coarse grind as compared to a ball grinding. It is proved by repeated comparative tests at comminuting of ores of different metals;
- the content of slime fractions (less than10 mkm) in the ground product significantly goes down which is conditioned not only by the increase in coarseness of grinding but by the impact mode to crush the material itself with the immediate withdrawal of the crushed product from the grinding chamber into the classifying zone.
The increase in coarseness of the reduction product as well as a drop in the content of slime fractions make it possible to switch to a dry methods of beneficiation for a lot of minerals as well as apply more widely gravitation methods at the first stage of concentration which makes cheaper ore processing. With this water is excluded from the technological process as well as the operation on dehydration. Air classifiers can be used to extract minerals into concentrate at the stage of comminuting, to separate into wastes small frac-tions of the ground ore with a dump content of useful components. As a result the necessity to locate the ad-ditional equipment stands no longer while the quantity of the material arriving for concentration reduces.
Similar technologies have already been introduced at a lot of enterprises of ore-dressing industry. Positive results have been obtained on applying SPA “Center” equipment in the technological lines at dry methods of concentration.

Developed by - Dew Point

SPA "Center", 19, Sharangovich str.,220018, Minsk, Belarus
phone: + 375 17 259-06-90, fax: + 375 17 313-45-40, e-mail: info@npo-center.com