Factors affecting the flotation process
Source： Time:10 September 2020
The key design variable in the dissolved air flotation system controls the removal efficiency. Flotation is susceptible to some factors in the process, these factors include grinding fineness, pulp concentration, pulp pH, chemical system, aeration and stirring, flotation time, water quality and other process factors. The following is a detailed introduction to these factors affecting the flotation process.
1. Grinding fineness
In order to obtain a more suitable grinding fineness, it must be determined by testing and referring to production practice data. For some ore, the process of stage grinding and stage separation is often used to avoid the ore from being crushed, so as to select the dissociated ore particles in time.
2. Pulp concentration
The slurry concentration is one of the main factors affecting the flotation index. The appropriate slurry concentration should be determined according to the nature of the ore and the flotation conditions: the minerals with larger flotation specific gravity or coarser particle size should use thicker slurry, which can increase the recovery rate and reduce the consumption of flotation reagents.
3. The pH of the pulp
Various minerals have a "float" and "non-float" PH value when using different flotation agents for flotation, which is called the critical PH value. Controlling the critical PH value can control the effective separation of various minerals.
4. Pharmacy system
During the flotation process, the type and quantity of the medicine, the place of dosing and the method of dosing are collectively called the pharmacy system, also called the prescription. It has a significant impact on the flotation index.
5. Aeration and stirring
Aeration and stirring are carried out in the flotation machine at the same time. Strengthening them will help improve the flotation index. However, if they are strengthened too much, it will cause bubble merger, decrease in concentrate quality, increase in power consumption, and mechanical wear. Therefore, aeration and stirring must be appropriate.
6. Flotation time
The length of the flotation time directly affects the quality of the index. If the time is too long, the grade of the concentrate will decrease; if the time is too short, the grade of the tailings will increase. Therefore, the flotation time required for various minerals must be determined through experiments.
7. Water quality and slurry temperature
Flotation is generally carried out at room temperature, but sometimes in order to obtain a good separation effect, it is also necessary to warm the slurry. The specific heating or not needs to be determined according to the actual situation. If heating is required, it needs to be adapted to local conditions and try to use waste heat and exhaust gas.
Since the content of useful components in the ore that needs flotation treatment is getting lower and lower, the particle size of the dye is getting finer, and the ingredients are becoming more and more complex and difficult to select, so on the basis of grasping the above seven factors, we must pass full practice To choose the appropriate flotation process.
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