The importance of steel balls to abrasive operations
For minerals, steel balls and lining are large consumables, accounting for more than 80 % of the total consumables, and steel balls account for more than 80 % of them. With the rapid development of my country's mining, cement, and power industries, steel ball demand has also increased year by year.
As a part of the mineral selection process, the abrasive operation is an indispensable part of the mineral selection process, which plays a key role in the technical indicators of the mineral selection process. The high or low of milling efficiency is closely related to the economic benefits of the mineral selection. As a manor and energy transmitter for the abrasive operation, steel balls have a vital impact on the impact of abrasive operations.
The following is a brief discussion on the influence of the abrasive operation on the material of the steel ball, the filling ratio of the steel ball, the size of the steel ball and the ratio of steel balls.
1. The material of the steel ball
Different manufacturing processes of steel balls determine their different quality. The quality of steel balls affects the level of productivity, but also affects the height of the ball, which in turn affects the cost of mineral selection. At present, most of the minerals are used in cast steel balls and forging steel balls. Among them, cast steel balls can be divided into three categories: low chromium steel balls, high chromium steel balls and high -alloy steel balls.
The principle of the selection of steel balls is high hardness, no broken, and cost -effective. Especially the price -performance ratio is not cheaper, the better. If the wear is fast, the crushing rate is high, the indirect costs caused by the wear and crushing will far exceed the direct benefits brought by low prices, and the comprehensive benefits will be low. Therefore, you must choose the appropriate steel ball material according to the abrasive specifications and the nature of the ore.
2. Steel ball filling rate
The steel ball filling ratio in the grinding machine determines the strength of the milling effect. Intuitively understand that there are many balls, many strikes, and strong abrasive effects; on the contrary, less balls, few strikes, and weak abrasive effects. However, too low steel ball filling ratio will lead to insufficient impact energy, and it cannot be very good to form a broken grinding effect on the ore. Excessive filling ratio will cause a small space in the tube. Therefore, the appropriate steel ball filling rate must be selected to ensure the efficiency of the grinding machine. When the conditions of the milling operation include a certain amount of grinding machine size, milling concentration, and rotation rate, the filling ratio depends on the size of the ore particle size and the degree of difficulty grinding. Essence The appropriate standard for filling ratio is the size of the grinding machine's productivity. The confidant ratio corresponding to the maximum productivity through testing is the best filling ratio.
For example, a copper gold mine in Indonesia increased the steel ball filling ratio from 14%to 18%, and the grinding machine processing volume increased by 5%to 10%. At present, the steel ball filling ratio of the mineral steel ball is stable at 16%to 18%. However, increase the steel ball filling ratio, the particle size of the product will become thicker. When the system is optimized, you should notice this, because the granularity of the semi -self -grinding machine becomes thicker, which will increase the grinding load of the subsequent ball mill.
3. The size of the steel ball
In the abrasive operation, steel balls can have two effects of impact and peeling on ore grains. The diameter of the steel ball is too small. The shock of the steel ball on the unit ore is crushed energy and improves the crushing effect of the ore. However, under the same steel ball filling ratio, increase the diameter of the steel ball, the number of steel balls will be reduced accordingly, the frequency of crushing ore will be reduced, that is, that is, that is, that is, that is, that is, that is, it will be reduced. It will reduce the frequency of crushing ore, so it is necessary to determine the proper steel ball size according to the actual conditions. In addition, while increasing the diameter of the steel ball, while increasing the ore processing capacity, it will also make the particle size of the semi -self -grinding machine thicker, increase the impact on the abrasive lining, reduce the service life of the lining plate, optimize the steel ball in optimizing the steel ball, Pay special attention to the diameter.
For example, after the nature of the Meishan Mining Factory changes in the nature of the ore, the φ100mm steel ball is replaced by the original φ120mm steel ball. When the processing volume does not change when maintaining the table, the electricity cost can be saved 492,300 yuan each year, and the purchase fee for steel balls is 16.63. 10,000 yuan, that is, the annual production cost can be reduced by 65,600 yuan, and the service life of the abrasive lining plate can be prolonged, reducing noise, and significant economic and environmental benefits.
4. Steel ball ratio
The grinding machine needs to add a certain amount of steel balls regularly during operation to complete the grinding operation. Because the granularity of the grinding raw ore consists of several granular levels, a size of a size cannot be added. Instead, it is necessary to divide the steel balls of several corresponding sizes in the original ore to complete The best efficiency. In the actual abrasive operation, the size of the steel ball is too large, which will lead to excessive strikes, which can easily produce "running and crushing" and over crushing; the size of the steel ball is small No matter how thin. Therefore, in production and operation, it is necessary to adjust the most suitable steel ball supplement scheme in time according to the nature and particle size composition level.
