Method for preparing steaming pressure aeroconcrete by skarn type mine tailings

Abstract

The invention relates to a method for preparing steaming pressure aeroconcrete by skarn type mine tailings, which belongs to the field of ore mine environment protection and the field of building materials and comprises following ingredients in percentage by weight: 25 to 45 percent of skarn type mine tailings, 25 to 35 percent of water quenching blast furnace slag, 15 to 30 percent of silica sand, 6 to 12 percent of cement clinker, 3 to 6 percent of natural gypsum, water reducing agents accounting for 0.6 to 0.9 percent of the total mass of the mixed dry materials, 0.06 to 0.12 percent of aluminum powder and 35 to 45 percent of warm water at the temperature between 48 and 55 DEG C. The aeroconcrete prepared by the invention has the moisture pressure-resistance intensity higher than 3.5 MPa, the absolute dry pressure-resistance intensity higher than 5 MPa and the dry body density between 550 kg / m<3> and 650 kg / m<3>, the requirement of the national standard on the performance indexes of the steaming pressure aeroconcrete can be met, and the invention provides a novel utilization path for the skarn type mine tailing resources with difficult utilization, and is favorable for solving the problems of ground resource occupation and environment pollution of the piling storage of the skarn type mine tailings.

Description

technical field [0001] The invention belongs to the fields of mine environmental protection and wall materials, and in particular relates to a method for preparing autoclaved aerated concrete by using skarn tailings. Background technique [0002] Autoclaved aerated concrete is currently the only single wall material that can achieve 50% building energy saving. It has the characteristics of light weight, heat preservation, heat insulation, sound absorption, fire prevention, and easy processing. In view of these characteristics, under the background that the country prohibits the use of clay bricks, autoclaved aerated concrete is occupying a growing market as a wall material. At present, there are mainly aerated concrete products prepared by lime-cement-sand and lime-cement-fly ash in the market in our country. Because ash plays an important role in the field of concrete, the supply of ash is becoming increasingly tight, which will inevitably increase the cost of raw material...

AI Technical Summary

Problems solved by technology

However, this method needs to burn the green body at a temperature of 1110°C to 1160°C for 26 to 28 hours. Although the use of solid waste saves raw material costs, it also solves the durability problem by allowing the raw materials to undergo solid-phase reactions. However, the energy consumption in the post-production process is relatively large

The invention utilizes skarn-type tailings to prepare autoclaved aerated concrete, so that the active components in the raw materials can fully react under autoclaved conditions, and overcome the potential lack of durability brought by its high magnesium content to the manufacture of cement problems and insufficient heat insulation of lime-sand brick wall materials, and give full play to the characteristics of light weight, heat preservation, heat insulation, sound absorption, fire prevention, and easy processing of aerated concrete to provide an energy-saving wall material that enables The high value-added utilization of such tailings becomes possible

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