## Grinding Efficiency

Grinding efficiency refers to the amount of ore processed for every 1kW.h of electricity consumed. It has the following representation methods:

- The raw ore (tons) processed for every 1kW.h of electricity consumed, namely: t/kW.h.
- Grinding products (tons) of a specified level (often less than 200 mesh) are obtained every time 1kW.h of electric energy is consumed.
- Calculate by surface area * t/kW.h.

The productivity per unit power consumption can more truly reflect the working conditions of the grinding machine. Therefore, when designing a concentrator, the productivity per unit power consumption is often used to compare, calculate, and select grinding equipment.

## Grinding Machine Technical Efficiency

The technical efficiency of the ore mill refers to the ratio between the content (%) of the qualified particle size in the product obtained after grinding and the content (%) of the original ore that is greater than the qualified particle size.

The calculation formula 1 is as follows:

**Remark:**

**E _{efficiency：}**Efficiency of grinding technology, %.

**r**The yield of the ore discharging from the grinding machine is less than the specified maximum particle size level, %.

_{：}**r**The yield of the ore that is less than the specified maximum particle size level, %.

_{1：}**r**The yield of the crushed part in the ore, %.

_{2：}**r**The yield of the crushed part in the discharge, %.

_{3：}**(100-r**The yield of the ore that is larger than the qualified particle size, %.

_{1})_{：}**(r-r**The yield rate of the maximum particle size produced during the grinding process, in %.

_{1})_{：}**(r**The yield of the newly formed over-crushed part in the grinding process, %.

_{3}-r_{2})(1-(r_{1}-r_{2})/(100-r_{2}))_{：}In the beneficiation process, over-crushing of the grinding will reduce the beneficiation index. Therefore, to evaluate the quality of the grinding machine, we must refer to these factors: productivity, energy consumption, over-crushing rate, etc.

When the ore grinder does not have grinding action, **r=r _{1}, r_{3}=r_{2}**, and

**E**=0 from formula 1.

_{efficiency}When all the ore has been crushed,

**r**=100%,

**r**=100%, and

_{3}**E**=0.

_{efficiency}When 100% of the grinding products reach the specified size and there is no over-crushing phenomenon, that is,

**r**, the

_{3}=r_{2}

**E**_{efficiency}_{ }is 100%.

Gongyi Forui Machinery Factory is a high-quality enterprise specializing in the production of beneficiation equipment. Over the years, it has produced gravity beneficiation, magnetic separation, flotation, and other beneficiation equipment, and has accumulated a lot of practical experience. Forui Machinery is involved in lead-zinc ore, gold ore, fluorite, barite, pyrite, hematite, limonite, magnetite, manganese ore, antimony ore, tungsten ore, tin ore, celestite, etc. In the field of beneficiation of a variety of minerals, fruitful results have been achieved.

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