Application of a Low Density Grinding Body in Slag Grinding

Abstract

The invention relates to an application of a low density grinding body in mineral slag grinding. 70-90% By mass of mineral slag is mixed with 10-30% of fly ash, the granularity of the obtained mixture is controlled to be not more than 3 mm, the water content of the mixture is controlled to be not more than 1.5%, and the mixture is ground through a three-bin ball grinder to obtain mineral slag micro-powder, wherein a metal powder grinding body is arranged in the primary bin of the three-bin ball grinder, and the low density grinding body is respectively arranged in the secondary bin and the tertiary bin of the three-bin ball grinder. When the low density grinding body is used to produce the mineral slag powder, the temperature in the grinder is low, the electrostatic effect of the grinding body is small, the controllability of the residue on sieve and the specific surface area are further improved, and distribution of mineral slag powder with the particle size of 3-32 [mu]m is optimized, so the particle distribution tends to reasonability, the water requirement of the mineral slag micro-powder is reduced, the use amount of a grinding aid is reduced, and the adaptability of the mineral slag micro-powder and additives is improved. The volume density of the low density grinding body is half of the volume density of traditional grinding bodies, so the load of a grinding machine is reduced, the running current of a base machine is low, and power consumed in the grinding process is reduced by 30% or above.

Description

technical field [0001] The invention relates to the technical field of application of grinding bodies, in particular to the application of a low-density grinding body in slag grinding. Background technique [0002] Slag fine powder is a high-fineness, high-activity powder obtained after water-quenched blast furnace slag is processed by drying, grinding and other processes. It is a high-quality concrete admixture and cement mixture. Important cementitious material of cement. However, due to its poor grindability and high specific surface area requirements, the grinding energy consumption is huge, and the slag powder contains a certain amount of metallic iron, which is relatively abrasive, the grinding body and liner are severely worn, and the service life is short. high cost. [0003] In the production process of slag powder, the power consumption of grinding accounts for more than 70% of the total power consumption. Most of the mills are mainly ball mills. The grinding bod...

AI Technical Summary

Problems solved by technology

However, due to its poor grindability and high specific surface area requirements, the grinding energy consumption is huge, and the slag powder contains a certain amount of metallic iron, which is relatively abrasive, the grinding body and liner are severely worn, and the service life is short. high cost

[0003] In the production process of slag powder, the power consumption of grinding accounts for more than 70% of the total power consumption. Most of the mills are mainly ball mills. The grinding body used in the slag ball mill is mainly metallic iron, compounded with appropriate amount of chromium, manganese, etc. Alloy grinding body made of metal with high bulk density, 7.8g / cm 3 , the power load required for the operation of the mill is large, the operating current is high, and the power consumption is large; and the wear resistance of the grinding body is poor, the wear is large, and the cost is high

Images