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July 25, 2017 Liners

For mining industry, it’s well known that comminution operation is most expensive and energy consuming. Any action aiming at reducing the consumption and cost of grinding media is welcome. To achieve this goal, it is necessary to understand the wear mechanisms that take place in grinding process and to consider the details of such process like the interaction between mineral slurry and grinding media. Here let’s talk about some effective know-how about improving grinding efficiency. 



1.Feeding speed. Most ball mills can be controlled manually or automatically. No matter which way you choose, the velocity should be uniform.

2. Feeding size. The relationship between feeding size and ball mill capacity varies with mineral properties. In heterogeneous ores grinding, the finer the mineral slurry, the higher the ball mill capacity. Heterogeneous ores tend to result in selective grinding, for easily grinding particles usually are comminuted in rough grinding, while the rest wear-resistant particles will decrease ball mill capacity. Therefore, large feeding sizes will affect ball mill efficiency.

3. Mineral slurry density: in wet grinding, material pass time, production efficiency and ball mill power are all influenced by mineral slurry density. Generally speaking, the suitable density is close to 80% when feeding size is large and circulating load is high.

4. Ball mill rotating speed: when grinding ball adding rate remains constant, the useful power of ball mill varies with the rotating speed, therefore, production efficiency will also be influenced. Ball mill rotating speed need to be adjusted according to different types of ores. If the motor power is large enough, increasing rotating speed properly is an effect way to improve production.Usually, grinding media consumption accounts for 65%-90% of the total grinding steel consumption while liner consumption accords for 10%-15%. 


5. Add corrosive components. Wet grinding can also add a corrosive component to total wear mechanism,which can remove adhesion and then wear rates are expected to rise from synergies between corrosive and abrasive components. Common grinding aids includes carbon materials like coal and cock as well as surface active materials like sulfite liquor and triethanolamine scraps, but the addition amount should be controlled strictly, which should not be exceed to 1% for cement grinding.

6. Grinding media size match. Grinding media gradation usually is influenced by particle size, hardness, material grindability and the product fineness requirements. To control material flow rate well, we usually mix and match different sizes grinding balls. Generally, narrowing clearance among steel balls can slow down material flow rate and thereby extend grinding time and improve efficiency. However, different sizes may cause different linear speed, so one collocation should not include too many different sizes since natural stratification is easily to come out among steel balls. Too many gradations will lead to obvious laying which will sever affect grinding efficiency. 


Shandong Iraeta introduces advanced technology from foreign country, has fully automatic production lines and ISO 17025 standard laboratory as well as strict inspection systems. According to customer’s actual situation, our experts are able to offer the unmatched solutions to  improve production efficiency and lower energy consumption. 

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