How to effectively improve the grinding fineness of ball mill

Grinding cost is a high part of concentrator. How to control the grinding fineness effectively and reasonably is an important factor to directly reduce the grinding cost and improve the economic benefit of concentrator. Because grinding fineness is one of many factors that affect mineral processing indexes, grinding fineness directly affects concentrate grade and product recovery rate. Therefore, the technical operation of ball mill is extremely important.

First of all, we should fully understand the influencing factors of grinding fineness To sum up, the factors that affect the grinding fineness are: raw ore hardness, crushing granularity, mesh number, feeding rate, ball mill model, number of steel balls, size ratio of steel balls, ball mill liner wear, ball mill speed, classifier speed, classifier spindle lifting height, classifier blade wear, classifier overflow weir height, classifier lower opening height, classifier lower opening size, classifier opening height, etc.

Knowing all these factors, we should look for them one by one in the production operation and find the best adjustment factors.

Raw ore hardness: Different ores have different hardness, which is fixed and cannot be adjusted relative to the same ore. However, in production, under the premise of technical requirements of mineral processing, reasonable ore blending can be carried out to make the ore particle size as uniform as possible and the ratio of lump ore to fine ore reasonable and stable. In addition, due to long-term wear, the belt may leak ore at the feeding place of the ball mill belt, and most of the leakage ore is fine ore. This part of the leakage must be replenished to the ball mill as soon as possible. If the accumulation time is long and concentrated, it will cause uneven feeding of ball mill and unstable production. Especially refractory minerals, powdery minerals and massive minerals often have different properties.

The lifting height of classifier spindle is also an important factor affecting sand returning and grinding fineness. General normal production needs to install the classifier spindle in place. In some concentrator ball mills, after the equipment is overhauled, the ore in the classifier is not cleaned up, and after a long period of settlement, the ore mud sinks more firmly. When lowering the classifier spindle, due to carelessness, the spindle is not completely lowered, resulting in less sand return than normal. In addition, the failure to put down the spindle may also be due to the fact that the spindle has not been cleaned and oiled for a long time, so pay attention to it when operating.

The adjustment of crushing granularity and mesh number is the key point, and the ball mill must supervise the crushing system. If the particle size of the ball mill feed changes during the production process, it must be immediately reflected to the crushing workshop. Finally, the finer the particle size, the better.

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