Simple and easy to remember ball mill specification operation诀窍

Ball mills are a very common grinding equipment only in mineral processing applications. The principle of the small ball mill is not so complicated. The general principle of grinding is to use the friction between the material and the steel ball or the steel column and the rotating form of the drum to promote the material to the ideal grain size standard. Grading and flotation operations in subsequent beneficiation processes. Then, as a very important grinding equipment in the tailing equipment , the ball mill bears the heavy responsibility of grinding. If there is a slight error, the consequences will be great, so whether the ball mill grinding operation as a central link must be emphasized Here's how to operate it? Here, Zhongnuo Machinery believes that as long as you master the secrets of “all ore, large returning sand, high concentration”, you can achieve the most ideal grinding effect. This will be described in detail below.

What is “all mines”? In fact, we can understand this way. We should also pay attention to the situation of “all mines”. Why do you want to say this? In fact, there are two main implications here: one is to give a uniform composition of the ore size; the other is to give the ore rate (the amount of minerals fed into the mill per unit time) constant. In order to improve the grinding efficiency, the ore supply should be continuous, uniform and stable at a high level. For a long time, the mass fraction in the mill will fluctuate frequently, which is not conducive to the grinding process. Grinding feedstock tends to have particle size segregation in the silo - the middle is fine, and the surrounding coarse is easy to cause uneven composition of the feed. If it can not be adjusted according to the particle size, the "flatness" will appear. Therefore, the silo should be used as much as possible to feed the mine.

Then the meaning of “great return sand” is also very simple. We require “big sand return” in the operation of the small ball mill grid plate. In order to explain such benefits, first we will first talk about what is sand return. Back sand refers to the coarse-grained grade that is returned to the grinding machine by the classifier when it is closed. The amount of returning minerals is often several times that of the original ore. The ratio of the amount of sand returned to the amount of ore delivered is called the sand return ratio. Practice has proved that the size of the sand return ratio will directly affect the mill productivity. The larger returning sand ratio increases the grouting speed of the mill due to the increase of the total ore supply of the grinder, and the residence time of the material in the grinder is shortened and the cycle is accelerated. In addition, although the sand returning is a coarse ore, it is finer than the original ore. Therefore, the grain size composition of the mill is fine, and the comprehensive result is beneficial to increase the productivity of the small ball mill. By studying the relationship between the return sand ratio and the relative productivity of the mill. It can be known that within a certain range (such as between 100% and 500%), with the increase of the sand return ratio, the productivity of the mill increases, and when the certain value is reached, the productivity increase is small, and the mill is fully fed. Through the ability, it is easy to cause the ball to swell. Therefore, the sand return ratio should be kept stable and close to a constant value.

The so-called “high concentration”, the grinding mass fraction is an important factor affecting the productivity of the grinding machine. It determines the friction between the grinding medium and the material to be ground, the fluidity of the slurry and the effective density of the medium (the difference between the medium and the pulp density) ). At the same time, the amount of ore per unit volume in the ore discharge is large, so the amount of ore discharged is large. However, the mass fraction of the pulp is too high. Due to the increase of the pulp density, the effective density and activity of the dry ball mill ball will be weakened, the mass fraction will be high, the viscosity will be high, the fluidity will be deteriorated, and the total discharge capacity will be reduced. On the contrary, it will lead to a decrease in the productivity of the mill, and even a tendency to "bloat". Mainly refers to the mass fraction (pulp mass fraction) is the percentage of ore quality (dry weight) and pulp quality (ore + water) in the pulp, where the mass fraction refers to the pulp mass fraction (grinding mass fraction) in the mill. In the operation of the mill, a higher grinding mass fraction is generally used, so that a layer of pulp can be attached to the surface of the medium to enhance the abrasive effect on the grinding. Therefore, "high concentration" means that the grinding quality fraction is appropriately increased within a certain range, which is advantageous for improving the grinding effect.

As long as you master the above-mentioned ball mill operating specifications, or learn from the experience of the predecessors, you can let the ball mill work under the best working conditions. The core issue exposed by the nine-character secret is the balance between input and output efficiency.

Sheet Metal Fabrication Service

Processing steps For Sheet Metal Parts - Custom Sheet Metal Fabrication Service Company
1. Design and draw the part drawing of its sheet metal parts, also known as three views. Its function is to express the structure of its sheet metal parts by means of drawings.

2. Draw an unfolded drawing. That is, unfold a part with a complicated structure into a flat piece.

3. Unloading. There are many ways to unload, mainly the following methods:

a. Shearing machine cuts the material. It uses the shearing machine to cut out the length and width dimensions of the expanded drawing. If there are punching and corner cutting, then the punching machine is combined with the die to punch and corner to form.
b. Punch blanking. It is the use of a punch to punch the structure of the flat part after the parts are unfolded on the plate in one or more steps. Its advantages are short labor hours, high efficiency, and can reduce processing costs. It is often used in mass production.
c. NC CNC blanking. When NC blanking, you must first write a Cnc Machining program. That is, use the programming software to write the drawn expanded diagram into a program that can be recognized by the NC CNC machining machine. Let it follow these programs step by step on a piece of iron plate On the top,punch out the structural shape of its flat parts.
d. Laser cutting is the use of laser cutting to cut the structure and shape of the flat piece on an iron plate.
4. Flanging and tapping. Flanging is also called hole extraction, which is to draw a slightly larger hole on a smaller base hole, and then tap the hole. This can increase its strength and avoid slippage. Generally used for sheet metal processing with relatively thin plate thickness. When the plate thickness is large, such as the plate thickness of 2.0, 2.5, etc., we can tap directly without flanging.

5. Punch processing. Generally, punch processing includes punching and cutting corners, punching blanking, punching convex hull, punching and tearing, punching and other processing methods to achieve processing purposes. Its processing requires corresponding molds to complete the operation. There are convex molds for punching convex hulls, and tearing forming molds for punching and tearing.

6. Pressure riveting. As far as our factory is concerned, pressure riveting studs, pressure riveting nuts, pressure riveting screws, etc. are often used. The pressure riveting method is generally completed by a punch or hydraulic pressure riveting machine. Riveted to the sheet metal part.

7. Bending. Bending is to fold 2D flat parts into 3D parts. Its processing requires a folding bed and corresponding bending molds to complete the operation. It also has a certain bending sequence, and the principle is to make the next cut The first fold that does not cause interference will produce the interference back fold.
8. Welding. Welding is the group welding of multiple parts together to achieve the purpose of processing or the edge welding of a single part to increase its strength. The processing parties generally include the following: CO2 gas shielded welding, argon arc welding, Spot welding, robot welding, etc. The selection of these welding methods is based on actual requirements and materials. Generally speaking, CO2 gas shielded welding is used for iron plate welding; argon arc welding is used for aluminum plate welding; robot welding is mainly in-material It is used when the parts are large and the welding seam is long. Such as cabinet welding, robot welding can be used, which can save a lot of tasks and improve work efficiency and welding quality.

9. Surface treatment. Surface treatment generally includes phosphating film, electroplating colorful zinc, chromate, baking varnish, oxidation, etc. Phosphating film is generally used for cold-rolled plates and electrolytic plates, and its function is mainly to plate on the surface of the material. A protective film is applied to prevent oxidation; the second is to enhance the adhesion of its baking paint. Electroplated multicolored zinc is generally treated with cold-rolled plate surface treatment; chromate and oxidation are generally used for surface treatment of aluminum plates and aluminum profiles; its specific surface The choice of treatment method is based on the customer's requirements.

10. Assembly. The so-called assembly is to group multiple parts or components together in a certain way to make them into a complete material. One thing that needs to be paid attention to is the protection of the materials, and no scratches. Assembly is the last step in the completion of a material. If the material cannot be used due to scratches, it needs to be reworked and reworked, which will waste a lot of processing man-hours and increase The cost of the item. So pay special attention to the protection of the item.