High quality magnetic separator

PTMS magnetic separation

what is magnetic separation method for concentration of ore?

In the grinding operation, the consumption of the ball mill ball is very large, about 10 times of the ball mill liner. In order to make up for the loss of the ball and ensure the ball load particle size in the ball mill, it needs to be supplemented regularly according to a certain ratio. Add steel balls. The consumption of ball mill balls is mainly due to mechanical wear and corrosion wear. They are the "physical-mechanical" and "physical-chemical" irreversible processes that occur on solid surfaces. How to effectively reduce the ball mill under the premise of ensuring the quality of the ball mill? What is the energy consumption of steel balls?

1. Changing the grindability of the ore to the ball mill is one of the reasons that affects the energy consumption of the ball mill ball. Generally, the grindability of the feed grain size is small, the ore is easy to grind, and the wear of the ball mill ball is smaller. The consumption is also small; on the contrary, the opposite is true. In actual production, if it is difficult to grind ore or ore requires fine grinding, it may be considered to add certain chemicals in the grinding process to improve the grinding effect and increase the grinding when economic and site conditions permit. Mine efficiency; or heat treatment of ore to change the mechanical properties of the entire ore and reduce the hardness of the mineral. Both methods can effectively reduce the energy consumption of the ball mill.

2. Reduce the grain size of the ball mill. The ball mill has a large particle size. The ball mill has more work on the material. In order to achieve the specified grinding fineness, the workload of the ball mill is bound to increase, and the energy consumption of the ball is also Will increase. In order to reduce the power consumption of the ball mill, the feed size of the grinding can be reduced. Therefore, it is required to have a small particle size of the crushed product, that is, to "grind and grind".

3. Reasonable ball filling rate When the ball mill speed reaches a certain level, the filling rate is large, the number of hits of the steel ball on the material is increased, the grinding area is large, the wear is fast, and the filling rate is too high, and the ball mill steel is also changed. The movement state of the ball reduces the impact on the large particle material. On the contrary, the filling rate is too small and the grinding effect is weak. At present, the filling rate of steel balls in the grinding operation of the ore dressing is generally 45%~50%. If it is not a reasonable filling rate according to the actual conditions of each selected factory, it is necessary to pass the ore dressing test to determine a reasonable ball loading. the amount.

4. Reasonable steel ball size and ratio are due to the point contact between the steel ball and the material in the ball mill. If the ball diameter is too large, the crushing force is also large, the wear is too fast, and the material is easily broken along the penetrating force direction. Grinding efficiency. In addition, if the ball filling rate is the same, if the ball diameter is too large, the steel ball volume will be small, the breaking probability will be low, the over-grinding phenomenon will be intensified, and the product particle size will be uneven; the steel ball is too small, and the crushing force on the ore is weak. Small, grinding efficiency is low. Therefore, a reasonable steel ball size ratio not only reduces the steel consumption of the ball mill, but also effectively improves the grinding efficiency.

5, reasonable grinding concentration The concentration of grinding concentration will affect the specific gravity of the slurry, the degree of adhesion of the material around the steel ball and the fluidity of the slurry. If the grinding concentration is high, the adhesion of the material around the steel ball is good, the impact and grinding effect of the steel ball on the material is also large, and the steel ball wears faster. In actual production, the grinding concentration can be controlled by controlling the amount of ore, or the amount of water supplied, or adjusting the classification.

6. Control the rotation speed of the ball mill. Under the premise of the ratio of the ball mill ball and the reasonable, the rotation speed of the ball mill will increase, and the steel ball in the cylinder will be discharged into the pile. When the rotation rate increases to a certain extent, the useful power will reach the maximum. The value of the grinding is the best, and the ball mill ball wear is also the most reasonable. The theoretical critical rate of ball mill is generally 78 to 84%. Due to the nature of the material and other factors, the ball mill speed should be determined according to the actual situation. In the grinding process, there are many factors affecting the energy consumption of the ball mill steel ball, and most of the factors are difficult to quantitatively analyze, only qualitative analysis and judgment, to reduce the work of the ball mill steel ball under the premise of ensuring reasonable quality indicators Consumption must be considered from multiple links, and every link should be controlled to achieve the final technical and economic indicators and good product quality indicators.