Nonferrous mine graphite scrap concrete for backfill and method of manufacturing the same

Abstract

The invention discloses nonferrous mine mullock concrete used as filling and the preparation method thereof, and relates to the concrete which is used for mining backfilling and the preparation method thereof. The preparation method includes the following steps: at first, the mullock is crushed into grains with the diameter being 5 to 30 mm, then the mullock, ore dressing milltailings and fly ashes are adopted to be used as aggregate according to the weight rate of (5 to 7):(4 to 6):(0 to 3), and cement is adopted according to the weight rate (7 to 11): 1 part of the cement, then admixture is adopted with the weight of 0.3 to 1.5 percent of the cement. Then the aggregate, the cement, the admixture and mining wastewater are put into an agitator to agitate and make mortar with 65 to 88 percent of weight percentage concentration, then the mortar is cast and molded to be mullock concrete on the spot, or a mortar pump is sent to the site of the backfill mine, then cast and moulded to be the mullock concrete. Through detecting, the mullock concrete satisfies the strength requirement that R3 is equal to or larger than 1.5 MPa, R7 is equal to or larger than 2.5 MPa, R28 is equal to or larger than 5.0 MPa, the slump is equal to or larger than 22 cm, and the horizontal distance is equal to or larger than 500 m, and the height is equal to or larger than 30 m. The invention has the advantages of saving material by 10 to 20 percent, recycling the mullock and reducing the mine construction cost, thereby having obvious economic and environmental benefits.

Description

technical field [0001] The present invention relates to a kind of concrete for backfilling in mining. The present invention further relates to the preparation process of this kind of concrete. Specifically, non-ferrous metal mine waste such as mining waste rock, ore dressing tailings, fly ash and other non-ferrous metal mine waste produced in the production of non-ferrous mines is used as raw materials. Production of backfill concrete technology that meets the filling method of mining. Background technique [0002] Along with the development of non-ferrous metal mineral resources, a large amount of mining waste rocks are extracted from the surface with the ore. At the same time, mining wastewater, ore dressing tailings, slag and fly ash produced by smelting and power generation are discharged in large quantities, causing Some resources are wasted, and the heavy metal pollutants will pollute the soil and water in the mining area, seriously destroying the natural environment a...

AI Technical Summary

Problems solved by technology

But, so far, there are few reports both at home and abroad, using the underground waste rock of mines to make concrete for filling.

Although, since the 1990s in China, there have been reports of using tailings sand paste pumping to fill goafs, however, most of the filling materials in this process are still taken from the outside (for example, domestic water is used for production water), and waste water has not been realized. Large amount of resource utilization of stone, waste water and other waste