Inorganic composite cementing material specialized for coal mine filling, and preparation method thereof

Abstract

The invention discloses an inorganic composite cementing material specialized for coal mine filling, and a preparation method thereof. The inorganic composite cementing material is composed of the following raw materials: compound Portland cement or cement clinker, ordinary Portland cement, blast furnace slag micropowder, industrial waste gypsum, carbide slag, fly ash, an additive, citric acid and an excitant. The preparation method comprises the steps of drying all raw materials by a dryer; conveying the dried raw materials into a ball mill for milling; storing the dried raw materials in a raw material bin; conveying various raw materials to a mixer by a conveying melt; mixing uniformly; and then storing the mixture in a finished product warehouse. A filling paste provided by the invention can not be solidified or can be slightly solidified in 4 h and a slump degree is higher than 230 mm, can provide enough time for maintenance of filling equipment, prevents phenomena of tube plugging and waste tube caused by a long distance conveying pipe, can guarantee that mining work can be continuously carried out without mining column after demolding in 8 hours, increases mining output, increases resource mining rate, saves labor cost and increases production efficiency.

Description

technical field [0001] The invention belongs to the technical field of inorganic cementitious material for coal mine paste filling, and specifically relates to an inorganic cementitious material specially used for underground coal mine filling with coal gangue as aggregate and a preparation method thereof. Background technique [0002] In the prior art, coal mine filling cementitious materials are divided into two categories: inorganic and organic. Among them, the cost of organic materials is quite high and cannot be widely used in actual production; there are generally three types of inorganic materials, namely ordinary cement, cement powder, high Water quick setting material. The three materials have their own advantages and disadvantages. Among them, the cement powder has outstanding advantages as the bonding material for coal gangue powder underground filling. The cement powder is a brand-new inorganic composite material for full water cemented filling, which can be wi...

AI Technical Summary

Problems solved by technology

However, the coagulation speed of the colloidal solid powder in the prior art is relatively fast, and pipe plugging or waste pipes are prone to occur in long-distance transportation, especially in paste or semi-paste filling, which increases equipment and labor costs and wastes resources. The colloidal solid powder in the technology also has the disadvantages that the two technical contradictions of early strength and retardation, water reduction and segregation cannot be properly resolved in the actual filling construction, which is not conducive to popularization and application.