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The grade of dolomite usually refers to the percentage of its calcium carbonate (CaCO3) content. Dolomite is an important carbonate mineral whose grade standards can vary according to different uses and industries. Here are some common dolomite grade standards:
1. Industrial grade dolomite: Industrial grade dolomite is generally of lower grade, usually below 50%. Dolomite of this grade is mainly used in industrial fields such as building materials, cement production, glass manufacturing, fertilizer production, and steel smelting.
2. Fine grade dolomite: The grade of fine grade dolomite is relatively high, usually above 90%. This high-grade dolomite is mainly used in high value-added fields such as chemicals, plastics, rubber, coatings, coatings, and paper, which require high product purity.
Improving the grade of dolomite (Calcite) is to achieve the goals of higher purity and higher grade by optimizing the beneficiation and refining process, removing impurities, and increasing the content of the main component (calcium carbonate). Here are some common methods and steps that can help improve the grade of dolomite:
Raw ore beneficiation: rough and fine selection of raw ore to remove more impurity minerals, such as pyrite, stibnite, etc. Use appropriate physical mineral separation methods, such as gravity separation, magnetic separation, flotation, etc., to selectively extract dolomite minerals and reduce impurity content.
Fine grinding: Through further fine grinding, the dolomite ore is ground to make its particle size finer, which is beneficial to improving the flotation effect of calcium carbonate and improving grade.
Flotation separation: The flotation method is used to achieve selective separation of dolomite and other sulfide minerals by adjusting the chemical ratio and operating parameters. Optimize the flotation process and improve the recovery rate and grade of dolomite.
Pickling: Pickling is used to remove iron, magnesium and other impurities in dolomite. Pickling can dissolve some impurities and improve the purity of dolomite.
Refining: Refining the flotation and pickling dolomite to remove more impurities. Refining can include magnetic separation, gravity separation, redox and other processes to further improve grade and purity.
Classification: Through classification operation, dolomite with different particle sizes is separated to make the particle size in the concentrate more uniform and improve the grade of the product.
Increase product added value: According to market demand, develop high value-added products, such as ultra-fine dolomite, high-purity dolomite powder, etc., and improve product grade and market competitiveness through special processing and refining technology.
It should be pointed out that improving the grade of dolomite is a complex process that requires comprehensive consideration and optimization based on the characteristics of the raw ore, market demand and technical conditions. In actual operation, laboratory testing and process trials may be necessary to determine better solutions for improving grade
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