As the final step in the crushing process, a high-quality ball mill plays a crucial role in determining the quality of the raw materials during separation. Choosing the right type of ball mill will significantly increase the amount of metal recovered from the concentrate and improve the concentrate grade.
In this article, Sandreck will introduce the types of ball mills to help you make the right choice.
Classification based on grinding process
① Dry Ball Mill
Dry ball mill completes the grinding process in a completely dry environment. It has a rather strange processing method, and can be used in several industries such as: chemical, construction, mining, etc.
| Working Principle | The ball mill machine rotates the cylinder and drives the grinding media against the material being processed in order to crush and grind it. An air system is used to classify and transport the materials processed through the dry ball mill. |
| Applications | 1. Not process sticky materials (also perhaps materials containing water e.g.: Cement, Quartz Sand, Coal Dust, etc.) 2. In areas where arid climate, or lack of water exists. 3. This is not applicable to processes where the end user needs to obtain the ground and dried powder product directly from the process flow. |
| Advantages
| 1. Zero water utilisation. No requirement for treatment of waste water. 2. Simplifies the entire process by frees it from having to dehydrate and dry the materials 3. The system itself is very simple. It requires little capital investment and has low operating costs. |
| Technical Specifications
| 1. Air classifying system dedicated for separating out processed material. 2. Sealed structure to prevent escape. 3. Hot air may also be added in operation for simultaneously grinding and drying the materials. |
| Limitations
| 1. High requirements for maintaining an effective dust control. 2. Cannot process Sticky materials. |
② Wet Ball Mill
Wet ball mill is a kind of mining equipment which uses water as a medium to carry out grinding operations. It is widely used in the wet grinding process of metal ore and non-metal ore.
| Working Principle | A rotating cylinder drives grinding media to impact and grind materials in a water-based medium. Material conveying and grading are achieved through water flow or gravity flow of pulp. |
| Applications | 1. The processing of minerals (iron, copper, gold), etc. 2. Materials suitable for hydrometallurgical processing. 3. Applications requiring strict dust control. |
| Advantages
| 1. Very good grinding efficiency and continuous rapid capacity. 2. The danger of dust explosions is reduced and a cleaner atmosphere. 3. Relatively uniform product, in no way over-reground. |
| Technical Specifications
| 1. Act on gravity flow or pump. 2. Furnish classification devices copy to form a closed circuit system. 3. Special design for anti-corrosive lining. |
| Limitations
| 1. Heavy consumption of water. 2. Rehabilitation of dehydration equipment required. |
Classification by Ore Arrangement
① Great Ball Mill
This ball mill has a forced discharge structure with a grid plate for rapid discharge of the materials. This type of ball mill is suitable for coarse grinding operations and high-volume production lines.
| Working Principle | The grating forces the ore through. When it reaches the specified size, the ore is discharged directly and immediately, thus ensuring a high discharge rate. |
| Applications | 1. To a rough grinding operation 2. To a need of high processing capacity 3. To a process requiring rapid discharge of ore |
| Advantages
| 1. The speed of ore dressing is fast and the processing capacity is large. 2. The grinding phenomenon is relatively mild. 3. The grinding efficiency is relatively high. |
| Technical Specifications
| 1. Special lattice board design and lifting liner structure. 2. Adjustable ore discharge concentration. 3. High efficiency |
| Limitations
| 1. Structure is quite complicated. 2. The maintenance workload is relatively large. |
② Overflow Ball Mill
This kind of ball mill equipment uses the ore pulp itself to discharge by self-flow. It realizes the classification of the material by the way of overflow, which is especially suitable for the fine grinding operation and the occasion that needs to obtain the finer product.
| Working Principle | As the material stays in the machine for a longer period of time, the slurry naturally overflows from the hollow journal at the discharge end under the action of gravity, thus achieving self-discharge. |
| Applications | 1. A two-stage process is employed. The materials produced by the primary equipment are finely ground to produce an extremely fine product. 2. Suitable for processes or products with high requirements for particle size. |
| Advantages
| 1. Simple structure, convenient for maintenance. 2. The product will be fine. 3. The machine is stable in operation. |
| Technical Specifications
| 1. Simple overflow discharge; 2. Long cylinder; 3. Adjustable overflow concentration. |
| Limitations
| 1. Low capacity. 2. Susceptible to over-crushing. |
These are all the types of ball mills. Sandreck, a well-known ball mill supplier, provides high-quality wet ball mills, dry ball mills, etc. Please contact us if you have any needs.
