What is stage grinding and stage separation?
In the field of mineral processing,Stage grinding stage separationIt is an efficient sorting process that gradually improves the grade and recovery rate of ore by dividing the grinding and sorting process into multiple stages. This technology is widely used in the beneficiation process of metal minerals such as iron ore, copper ore, gold ore, and can significantly reduce energy consumption and improve economic benefits. The following are related topics and structured data analysis that have been hotly discussed across the Internet in the past 10 days:
1. Analysis of hot topics on the entire network (last 10 days)
| Ranking | hot topics | Discuss the popularity index | main focus |
|---|---|---|---|
| 1 | Energy-saving advantages of stage grinding stage separation | 85 | Energy consumption reduced by 30%-50% |
| 2 | Application of new grinding equipment in stage separation | 78 | High pressure roller mill, vertical mill |
| 3 | The impact of stage selection on rare metal recovery rates | 72 | Lithium, cobalt and other strategic resources |
| 4 | Environmental protection policies promote grinding technology | 65 | Wastewater recycling |
2. Core principles of stage grinding and sorting
The core of this process is"Segmented dissociation, segmented enrichment":
1.Coarse grinding stage: Crush the raw ore to a coarser particle size (such as 0.5mm), and quickly discard the tailings through simple separation (such as magnetic separation, gravity separation).
2.fine grinding stage: The rough concentrate is further finely ground (such as below 0.074mm), and the grade is improved through fine means such as flotation.
| process stage | Granularity requirements | Selection method | Typical recovery rate |
|---|---|---|---|
| Coarse grinding | 0.5-0.2mm | Magnetic selection/re-selection | 60%-70% |
| fine grind selection | ≤0.074mm | Flotation/electroseparation | 85%-95% |
3. Technical advantages and industry application cases
1.Energy consumption comparison: The energy consumption of the traditional full grinding and full selection process is 25-30kWh/t, while stage grinding and selection can be reduced to 15-18kWh/t.
2.Typical cases: An iron ore mine adopts two-stage grinding + three-stage magnetic separation, and the concentrate grade is increased from 55% to 68%, with an annual efficiency increase of over 200 million yuan.
| Mine type | Stage grinding and selection plan | Improved economic efficiency |
|---|---|---|
| porphyry copper deposit | Coarse grinding + copper and sulfur mixed flotation → fine grinding + copper and sulfur separation | Copper recovery rate↑12% |
| quartzite gold deposit | Stage grinding + carbon leaching method | Gold recovery rate↑8% |
4. Future development trends
1.Intelligent control: AI-based grinding particle size online monitoring systems (such as German Siemens solutions) are accelerating in popularity.
2.Green transformation: The newly issued "Ore Processing Wastewater Discharge Standard" in 2024 will promote further optimization of the stage grinding and separation process.
From the above analysis, it can be seen that stage grinding and stage separation technology is becoming a key path to improve quality and efficiency in the field of mineral processing, and its structured application will inject new impetus into the sustainable development of the mining industry.
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