1. What are the types and distinctive features of mills?

Answer: According to the different media of the mill, it is divided into: if the medium is steel balls, it is called a ball mill; if the medium is steel rods, it is called a rod mill; if the medium is gravel, it is called a gravel mill; if its own ore is used as the medium, it is called an autogenous mill. Adding an appropriate amount of steel balls to the autogenous grinding machine forms a so-called semi-autogenous grinding machine. According to the shape of the casing and the discharge method: the ball mill is further divided into short cylindrical, tubular and conical overflow discharge and grid discharge. The rod mill is further divided into cylindrical overflow discharge and open low-level discharge. , autogenous grinding or semi-autogenous grinding machines are mainly short-cylindrical.

2. What is the representation of mill specifications?

Answer: The expression method is: diameter × length, represented by the symbol D × L. For example, for a 2700 × 2100mm ball mill, its diameter is 2700mm and its length is 2100mm.

3. What are the types and characteristics of ball mills?

Answer: There are two types of ball mills commonly used in dressing plants: grid type and overflow type. The only difference between them is that the overflow type does not have a fan-shaped grid plate device in the ore discharge part. The overflow type ball mill’s slurry is automatically discharged through the ore discharge port. Since the grid type is equipped with grid plates, it has the function of forced ore discharge, thereby increasing the processing capacity and reducing over-crushing of the ore.

4. What is the expression method for grinding fineness?

Answer: The fineness of grinding products is usually screened with a standard 200-mesh sieve, and is expressed as the percentage of the sieved amount to the total product (the mesh is the number of sieve holes in each inch of sieve layer, and used to name the sieve).

5. What is the definition, expression and calculation method of mill utilization coefficient?

Answer: The mill utilization coefficient is the average amount of raw ore that can be processed per cubic meter of mill effective volume per unit time, expressed in tons/m³ hour. That is, the mill utilization coefficient q=Q/V (tons/m³·hour).

6. What is the definition and expression of the mill’s hourly production capacity?

Answer: Mill station-hour production capacity refers to the amount of raw ore that the mill can process per unit time (hour) under certain ore feeding and product particle size conditions, expressed in tons/unit hour.

7. What is grinding efficiency? What are its expression methods?

Answer: It refers to the amount of ore that can be processed per 1 kilowatt hour (one kilowatt hour) of electricity consumed. The expression methods are as follows: 1. The number of tons of raw ore processed per kilowatt hour of electricity consumed, that is, tons/degree. ②. The tonnage of grinding products obtained for each kilowatt hour of electricity consumed is calculated according to the specified grade (usually 200 mesh). ③. Calculated based on surface area tons/kWh.