CALCULATION OF THE GRINDING BALLS ASSORTMENT FOR THE CEMENT MILL

Summing up the year 2020, we can very calmly state that Energosteel’s grinding balls compete with similar products of world producers. Thus, we have significantly increased sales in the foreign market. At the beginning of 2021, we received several requests to calculate the grinding balls assortment for the loading into ball mill. In this article, we will consider the one of the requests from a company based in Yemen that specializes in cement production.

Production parameters:

Inside diameter: 4.2 meters
Total inside length: 13 meters
Production capacity: 75±10t/h (Closed circuit, ordinary carbonate cement, specific surface area: ≥320m2/Kg)
feeding size≤5mm,
moisture≤0.5%, air speed in mill ≥0.5m/s.
Mill rotary speed: 15.8±0.1r/min
Charging capacity of grinding medium: 230 ton.

The raw material for cement production has a high abrasion rate. Consequently, when calculating the assortment the balls with increased volumetric hardness have been taken into account. Into the first chamber of two-chamber mill is loaded with balls from 80 to 40 mm in diameter. The second chamber is loaded with balls from 40 to 25 mm in diameter.

The calculation the average diameter of the grinding ball in each chamber showed that the following assortment of grinding balls should be used for maximum effective grinding:

Into the first chamber: 80mm – 53 tons, 70mm – 33 tons, 60mm – 10 tons, 50mm – 10 tons, 40mm – 3 tons. The average diameter of this assortment is 71mm. The current loading shall be carried out with a steel ball of 80 mm;

In the second chamber: 40mm – 17 tons, 35mm – 15 tons, 30mm – 38 tons, 25mm – 51 tons. The average diameter is 28.8 mm, so the current loading shall be carried out with a steel ball of 30 mm.

Commercial negotiations are under way and delivery terms are being refined.

Let’s remind that to receive free advice on calculating the assortment of grinding ball, you may visit our website and fill in the necessary fields. The specialists of our company will make the necessary calculations and will contact you in the shortest possible time.