Slag micropowder grinding system and technology

Abstract

The invention discloses a slag micropowder grinding system and a technology. The system consists of a roller press, an air flow classifier, a dynamic classifier, a ball mill and a high-efficiency powder concentrator. Slag is subjected to de-ironing by a de-ironing separator, sent into the roller press by a belt conveyor for high-pressure treatment, and then sent into the air flow classifier by a cake elevator for separation; if the particle size of the slag is large, the slag returns to the roller press for extrusion again; fine powder with a small particle size enters the dynamic classifier along with an air flow for the separation; coarse powder separated by the dynamic classifier returns to the roller press for the extrusion again; the fine powder is sent to the ball mill for grinding; the ground material is sent to the high-efficiency powder concentrator for the separation; the separated coarse powder is returned to the ball mill for the grinding again; and the separated fine powder enters air box pulse bag dust collectors along with the air flow for collection, and then serves as the finished slag for warehousing. According to the slag micropowder grinding system and the technology, the roller press, the air flow classifier and the dynamic classifier form a circle flow, and the ball mill and the high-efficiency powder concentrator form a circle flow, so that slag micropowder can be subjected to repeated crushing and grinding, and the particle shape of the finished micropowder is good.

Description

technical field [0001] The invention belongs to the building material manufacturing industry, in particular to a slag micropowder grinding system and process. Background technique [0002] Slag powder is a high-quality concrete admixture and cement mixture. It is recognized as one of the preferred mixed materials for preparing high-durability concrete structures in the world today. Compared with ordinary Portland cement, concrete mixed with slag micropowder has the characteristics of low heat of hydration, corrosion resistance, strong adhesion to steel bars, strong impermeability, anti-shrinkage, and high later strength. Therefore, slag powder is welcomed by the construction industry as a new type of building material with high quality and low price. Slag micropowder is the slag produced by iron and steel smelting. After drying and mixing with gypsum in a certain proportion, it is sent to the slag micropowder mill for grinding, and then is screened by the powder concentrat...

AI Technical Summary

Problems solved by technology

Among them, one: the ball milling process generally uses a ball mill to grind the granulated blast furnace slag to a specific surface area of ​​400m 2 / Kg of slag powder, use another ball mill to grind materials such as cement clinker and gypsum to a specific surface area of ​​350m 2 / Kg or more, and then enter the respective storage warehouses of the cement batching system, measure, mix, homogenize and prepare slag cement with different strength levels according to the market demand, which not only makes the slag powder The activity of the cement has been fully exerted, the strength grade of the cement has also been improved, and the service performance has been greatly improved, but the production cost of this process is extremely high, and the scope of application is not wide; It is composed of three parts and the unloading belt. The slag fed into the mill from the feeding end enters the cylinder rotating at a supercritical speed, and is closely attached to the lining plate of the rotating cylinder under the action of centrifugal force. After being pressed, it is discharged, and the milled material is sent to the powder machine through the elevator, the coarse material is returned to the mill, and the fine material is sent to the finished product warehouse through the dust collector. The production cost of horizontal roller mill is lower than that of ball mill, but due to its equipment The structure and material selection are extremely picky, and there are many failures in mechanical and process operations in practical applications

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