Several representations of the productivity of the mill

The productivity of the mill has several representations, each with its own meaning and application.

1. The grinding machine's Taiwan time production capacity     That is, under certain conditions of feed and product size, the amount of raw ore that can be processed by each mill in unit time (hours) is expressed in tons per station. For example, the ø 3200 × 3100 mm lattice ball mill has a grain size of less than 10 mm, a product size of less than 0.3 mm, and 60 tons of ore per mill per hour. The mill's capacity is 60 tons per unit. ·Time.

With this method, only when the type, specification, ore nature, ore size and product grain size of the machine are the same, the working conditions of each grinding machine can be compared concisely. The inadequacies of this method sometimes do not truly reflect the operation of the mill. For this purpose, the use of the "utilization coefficient" notation has been proposed.

2. The "utilization coefficient" of the grinding machine     Mill per cubic meter effective volume per unit of time the average number of tons of ore that can be processed, expressed in time t / m ³ ·. Its calculation formula is as follows:

In the middle     q ——The utilization coefficient of the grinding machine, t / m ³ · hour;

             Q ——Production capacity of grinding machine, t / h;

             V - the effective volume of the mill, ^m3 .

When the ore size and product fineness are the same, the grinding machine utilization factor is mainly affected by the ore properties and operating conditions. As for the different specifications of the grinding machine, the influence on the utilization coefficient has been greatly reduced. Therefore, comparing the utilization factor of the grinding machine, the working condition of the grinding machine can be roughly evaluated.

3. Specific particle size utilization factor     The production capacity of a given size fractions content after grinding process that is obtained within a unit time representation, expressed in time t / m ³ ·. In most cases, the level of the newly generated -200 mesh ( -0.074 mm) level in the specified grinding process is indicated.

In the middle     q _{-200 mesh} - the grinding machine production capacity calculated according to the newly generated -200 mesh, ton / m ³ · hour;

        Q —— Calculate the production capacity of the grinding machine according to the original ore, ton / hour;

        β ₂ - in the graded overflow (closed grinding) or in the ore discharge (opening grinding) - 200 mesh level, % ;

        β ₁ - the content of the -200 mesh level in the ore feeding machine, % ;

                 V - the effective volume of the grinding machine, m ³ .

Usually, the main reason for calculating by -200 mesh is that when the ore is ground to below 200 mesh, the useful minerals of most ores basically reach the degree of monomer separation (except for very finely embedded ores). Level review The grinding machine work is relatively stable. The specific production capacity of the grinding machine is evaluated by a specific particle size utilization coefficient, which truly reflects the influence of ore properties and operating conditions on the grinding machine production capacity. Therefore, the design department in the new beneficiation plant yield calculation mill ore, or production department in comparison to handle different types of ore, and the same but the production capacity of the grinding machine of different specifications, use this calculation method.

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