Gangue ceramsite, and preparation method thereof

Abstract

The invention discloses gangue ceramsite, and a preparation method thereof. The gangue ceramsite comprises, by weight, 70 to 97% of gangue, 3 to 30% of calcium carbonate powder, 0 to 15% of quartz tail mud, and 0 to 10% of papermaking white sludge. According to the preparation method, calcining pre-heating temperature is controlled to be 200 to 1100 DEG C, pre-heating time is controlled to be 30 to 40min, roasting temperature is controlled to be 1100 to 1380 DEG C, and roasting time is controlled to be 2 to 8min. According to the above formula and the technology, gangue doping amount can be higher than 90%, problems such as pollution of ground and atmosphere by gangue, and large land resource occupying are solved effectively; at the same time, the formula is simple, using of environment burden high and exploitation limited raw materials is avoided, adopted materials are easily available, an advanced high efficiency flow production line is constructed, the strength of prepared ceramsite is higher than that of conventional product, the bulk density is 921.3Kg / m3, and the highest cylinder compressive strength is 16.8MPa.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a coal gangue ceramsite and a preparation method thereof. Background technique [0002] Coal gangue is solid waste discharged during coal mining and coal washing. It is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during coal formation. Including the excavation gangue during the roadway excavation, the gangue extracted from the roof, floor and interlayer during the mining process, and the gangue picked out during the coal washing process, the main component of which is Al 2 o 3 and SiO 2 . [0003] As a kind of coal waste, coal gangue is usually discarded. The discarded coal gangue not only occupies a large area of ​​land, but also pollutes the atmosphere, farmland and water bodies once the sulfides in it escape or leach. Gangue hills can also spontaneously ignite and cause fires, or collapse during the rainy s...

AI Technical Summary

Problems solved by technology

In this invention, spontaneous combustion coal gangue and coal slime are used as the main raw materials, and materials such as fly ash, foaming agent and additives are mixed in, and the strength of the ceramsite prepared by sintering is better than that of the predecessors, but the method takes a long time. Stone and quartz raw materials are restricted raw materials for mining, and the coal gangue is spontaneously combusted, so there are certain limitations on the utilization of coal gangue

[0008] Chinese patent CN201310440491.7 discloses a "preparation of coal gangue ceramsite", wherein 70-90% of coal gangue powder (coal slime and natural coal gangue), 6-22% of fly ash, foaming agent ( Sodium carbonate) 3-7%, auxiliary agent (manganese dioxide) 0.5-1% to prepare ceramsite, although the performance is excellent, but the foaming agent and auxiliary agent are all made of chemical raw materials, coal gangue is also mixed with coal slime, the cost is too high High, and the utilization of coal gangue is also limited

However, the disadvantage of this method is that the phyllite used is a restricted mining raw material, and the water glass in the formula is a chemical raw material. It has been realized in the indoor electric furnace, but it has not been applied in industrial production. There are relatively big problems in actual production and application.

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