What is the processing capacity of the ball mill?How to calculate?

The processing capacity of the ball mill refers to the amount of grinding that the ball mill can complete per unit time. It is one of the important indicators to measure the working efficiency of the ball mill.The processing capacity of a ball mill is usually expressed in tons/hour, Taiwan-hour processing capacity and utilization coefficient.

The representation method of the processing capacity of the ball mill

1. Processing capacity at Taiwan time

The hourly processing capacity refers to the amount of ore processed per hour by a mill under a certain feed particle size and product particle size, and the unit is “t/(Taiwan・h)”.For example, in the same mineral processing plant, the feed particle size and product particle size of several mills with the same specifications are the same, and the size of the processing capacity Q of the mills can directly determine the quality of the work of each mill.However, the specifications of the mill may be different for different mineral processing plants, and the particle size of the ore feed and the particle size of the product may not be the same. It is difficult to judge the quality of the mill's work based on the size of the processing capacity Q.

2. Utilization factor

The utilization coefficient refers to the productivity expressed by the quantity of 0-200 mesh obtained per unit time and per unit mill volume, and the unit is “tons/meter 3-hour".When the utilization coefficient is used to represent the productivity, the influence of different volume sizes on the calculation of productivity is eliminated to a certain extent.At present, the utilization coefficient is often used in domestic production practice to compare the efficiency of the grinding machines in each selection plant.However, it must be pointed out that the size of the utilization coefficient can only truthfully reflect the operating conditions of the grinder and the nature of the ore under the conditions that the particle size of the ore feed is similar to the particle size of the product.

Detailed explanation of the calculation method of the processing capacity of the ball mill

1. Equipment parameter calculation method

The processing capacity of the ball mill is closely related to its rotation speed and the volume of the cylinder.It can usually be calculated by the following formula: processing capacity = π × cylinder volume × ore bulk weight × grinding load factor ÷ grinding cycle.Among them, π is the pi (3.14), and the volume of the cylinder can be found in the parameter manual of the ball mill.The bulk weight of the ore needs to be obtained experimentally, and the bulk weight of different ores will be different.The grinding load factor and grinding cycle are related to the grinding conditions, such as the type, size, and filling rate of the grinding medium, which will affect the grinding load factor.The grinding cycle is affected by the working mode of the ball mill, the feeding speed and other factors.

2. Calculation method of multiple working conditions

According to the use of ball mills, a variety of different working conditions can usually be used to calculate the processing capacity.For example, when the import and export particle sizes of a ball mill are 1mm and 0.5mm, the processing capacity can be calculated by the following formula: Processing capacity=0.8309×Φ(0.5)×(Φ(0.5)-Φ(1))÷(K1×K2×K3×t).Among them, Φ(0.5) and Φ(1) represent the grinding efficiency at 0.5mm and 1mm, respectively. These two parameters can be determined by actual production data or tests.K1, K2, and K3 are grinding constants, and their values need to be determined according to specific ball mill models, ore properties, and other factors.t is the grinding time, generally in hours.In practical applications, by adjusting these parameters, the processing capacity of the ball mill under different operating conditions can be calculated more accurately, thereby providing a more reliable basis for production.

Methods to increase the processing capacity of ball mills

1. Optimize the structure and parameters

The selection of large-diameter rollers can increase the effective volume of the ball mill, thereby increasing the processing capacity.For example, in some large mineral processing plants, after using a larger diameter ball mill, the processing capacity has been significantly increased.At the same time, reducing the specific gravity of the grinding medium can also play a role in optimizing the structure and parameters of the ball mill.Lighter grinding media can move faster under the same dynamic conditions, increasing the contact frequency and collision force with the material, thereby improving the grinding efficiency.

2. Improve the quality of grinding media

High-quality grinding media such as high-chromium cast iron balls and steel balls play a key role in enhancing the processing capacity of ball mills.High-chromium cast iron balls have the characteristics of high hardness and good wear resistance, and can maintain a good shape and size during long-term use, so as to stably grind the material.Steel balls have the advantages of high strength and good toughness, can withstand greater impact and improve grinding effect.In practical applications, according to different ore properties and treatment requirements, reasonable selection of the material and size of the grinding medium can significantly increase the processing capacity of the ball mill.

3. Optimize operating conditions

Reasonable adjustment of operating conditions such as material feeding speed and water volume is an important means to optimize the processing capacity of the ball mill.In terms of feeding, it is necessary to ensure that the feeding speed of the material is uniform and continuous.If the feeding speed is too fast, it will cause the material in the ball mill to accumulate, affecting the grinding effect; and if the feeding speed is too slow, it will reduce the working efficiency of the ball mill.By precisely controlling the feeding equipment to keep the feeding speed within a suitable range, the ball mill can run more smoothly and the grinding efficiency is higher.In terms of water volume control, the right amount of water can play a role in lubricating and carrying materials.When the amount of water is too small, the concentration of the slurry is too high and the fluidity deteriorates, which affects the grinding effect; when the amount of water is too large, the concentration of ore in the slurry will be reduced, which is also not conducive to increasing the processing capacity.According to actual experience, generally controlling the slurry concentration within a certain range can effectively increase the processing capacity of the ball mill.