Dressing is a classic, is still widely used in mineral resources and processing technology, it is the ore crushing, dissociative each other, then, be useful mineral enrichment and separation, abandon the useless gangue. According to the different ore types and the demand for mineral products, can adopt different processing methods in practice. Commonly used preparation methods have flotation, re-election, magnetic separation method and electric separation method, which is the most widely used flotation process. Gravity separation method is widely used in ferrous and non-ferrous, rare metals, and the separation of coal; Magnetic separation method for ferrous metals and rare metals separation, can also be used to remove the iron impurities from non-metallic mineral raw materials, can also be used to purify water for production and living, and reclamation of magnetite in the heavy medium coal preparation; Selection method used in non-ferrous metal ore and rare metal, black metal ore (iron, manganese, chromium) ore sorting, is also used to nonmetal ore (such as coal powder, diamond, graphite, asbestos, kaolin clay and talc, etc.) of the separation. Apart from the above four mineral processing methods, and photoelectric separation method, chemical processing method and other special processing method. Various beneficiation method sometimes used alone, or are a combination of several methods used.
Ore beneficiation process is completed in the concentrator. Generally includes the following three basic processes.
First, the preparation before sorting operations
Including ore (coal) of crushing, screening, grinding and classification process. The purpose of this process is to make useful minerals and gangue minerals separation monomer, monomer dissociation between all kinds of useful minerals, in addition, this process is to create suitable conditions for the next step of mineral separation. Some mill according to the ore properties and the need of separation, in front of the sorting operation is equipped with washing and primary waste rock homework.
Second, the sorting operation
By gravity separation, magnetic separation, separation, flotation and other dressing method will be useful with gangue mineral separation, and the useful minerals separated in the end to mineral products (middling ore concentrate, tailings, sometimes output). The sorting job, at the beginning of the called roughing; Will get the roughing for further enrichment of products to choose don’t in order to obtain high quality concentrate selected don’t work on the final product is called selective; Will be further choose don’t lean product after roughing, return roughing or individual treatment of middlings was separated, in order to obtain high recovery rate of the operation called scavenging, poor product is the tailings after scavenging.
Third, choose products after processing jobs
Including all kinds of ore concentrate, tailings product dehydration, precipitation of fine grained material concentration, filtration, drying and washing water clarification circulation reuse and so on.
Non-traditional mineral resources and secondary resources processing and mineral materials processing technology, there are many similar to ore dressing process, but also has its special technological process and equipment, such as low grade mineral resources of biological extraction; Complex mineral resource, Marine mineral resources, industrial wastewater, such as solvent extraction, ion exchange, membrane separation, chemical leaching and other chemical separation; The surface modification and coating preparation functions such as mineral materials; Fine particles of accumulation and dispersion, coal-water slurry preparation, etc.