Abstract
The results of the study, aimed at designing of benefication technology of mine processing wastes of Voznesenskiy ore district, are presented in this paper. By the expert appraisals, the amount of tailings dumps of the Yaroslavskaya Mining Company is estimated to be more than 30 million tons. Sample testing has shown that fluorite content varies from 13% to 23%, calcite - up to 14%, and zinc - in the range of 0.4-0.6%. The research was conducted with tailing samples containing 20.7% of CaF2 and 10.2% of CaCO3. Mineral grains of the secondary raw material were examined for their surface state and a package of necessary preliminary operations, which provide an efficient material - flotation reagents interaction, was determined. It has been established that extraction of fluorite to concentrates that would match existing requirements is possible in principle. The use of ultrasonic treatment of material in its preparation for flotation is conditioned by an effective desorption of films of different nature from mineral particles. The suggested scheme of fluorite flotation involves preliminary treatment of raw material by ultrasound with dumping of released mud fractions. The optimal operating regime allows obtaining concentrates of higher quality than it is under usual technology without the ultrasonic exposure. In this process, the extraction of fluorite to a concentrate with 94.47% of CaF2 increases up to 61.11%, which is higher by 2.96% against the original studies.
Highlights
The major factor of achieving high efficiency of flotation in the processing of low-grade difficult raw material and processing waste is the creation of conditions for selective adsorbation of reagents on the surface of mineral particles
Desorption can be performed with the usage of different methods: mechanical, chemical, physical-chemical, and methods based on usage of complicated energetical impulses
According to the previously made research, during the usual mode flotation, without the usage of ultrasound, the fluorite extraction into high-quality concentrate with the content of CaF2 being 95.07% accounted for 40.7%
Summary
The major factor of achieving high efficiency of flotation in the processing of low-grade difficult raw material and processing waste is the creation of conditions for selective adsorbation of reagents on the surface of mineral particles. In the process of mine wastes dressing the problem is aggravated, since mineral grains’ surface. To ensure necessary contact of mineral particles with reagent and further selection it is essential to supplement the flotation scheme with the operations of surfaces desorptions. The separation into a different product with further removal from the scheme of desorbed chemical and mechanical surfaces, in order to avoid their negative effect on the technology’ further processing, is relevant
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