Method for preparing basalt porous heat-preserving material

Abstract

A method for preparing a basalt porous heat-preserving material includes the steps that basalt, screen glass, calcium carbonate, silicon carbide, manganese oxide, magnesium carbonate and sodium silicate are ball-milled to obtain batch; then the batch is contained in a mould and heated, foamed, cooled and annealed to room temperature, and the basalt porous heat-preserving material is obtained. By means of the method, waste can be used easily, the environment is protected, the prepared high-strength porous material is low in foaming temperature, basalt directly serves as the main material, the preparation process is simple, and the prepared porous heat-preserving material is high in structural strength, low in water absorbing rate, small in density and low in heat conductive coefficient. Production cost of the foaming porous material can be effectively reduced, the environment is protected, waste is turned into wealth, and economic benefits and environment protection benefits are obvious.

Description

technical field [0001] The invention relates to a method for manufacturing a porous thermal insulation material, in particular to a method for preparing a porous thermal insulation material by using basalt. Background technique [0002] Basalt is solid or powdery waste that is discharged after mining and sorting ores and cannot be used temporarily, including basalt tailings and dressing plant tailings, among which mine tailings include the associated surrounding rocks that have been mined and those that have been removed in the middle The low-grade ore; the tailings of the dressing plant include the mineral waste (tailings) discharged after the ore is mechanically washed by a certain process, and these tailings are transported to the tailings storage by pipelines. For this reason, a large amount of farmland and forest land have been occupied, and the ecology has been damaged, which is difficult to restore. [0003] The chemical components in basalt mines in my country mainl...

AI Technical Summary

Problems solved by technology

[0005] (1) Organic insulation materials: the typical representative is polystyrene foam insulation board (XPS), and its market share is gradually decreasing. Its main advantages are small apparent density, small thermal conductivity and good sound insulation effect, but poor thermal stability, flammable and The release of toxic gases, such as the CCTV fire, the Shanghai fire and other accidents are all related to flammable insulation materials

[0006] (2) Modified thermal insulation materials: typical representatives of modified urethane or hard foam polyurethane, the market share is increasing year by year, the main advantages are low density, low thermal conductivity, low water absorption, slightly improved fire resistance, but thermal stability The performance is poor, the combustion test volume is deformed or even produces molten droplets, and it is easy to release toxic gas (CO), which is not conducive to popularization

[0007] (3) Inorganic thermal insulation materials: typical representatives are rock wool or foamed cement thermal insulation materials, which have a small market share. The main advantages are non-toxic and harmless, good fire resistance, good weather resistance, and cheap price, but they have high thermal conductivity and good thermal insulation effect. Poor, high water absorption, heavy quality, difficult to construct

The porous insulation material prepared by this method has a high density, and the particle size of the tailings is less than 100 μm, which is difficult to operate and difficult to industrialize.

[0009] Patent CN104355546A provides a method for preparing foam glass with basalt glass clinker and CRT screen glass as the main raw materials. The obtained basalt glass clinker powder and CRT screen glass powder are ground and mixed, and the foaming agent and additives are proportionally Mixing, molding, firing, and annealing processes to obtain foam glass, the resulting foam glass has low density, high strength, and high porosity, and can be used as thermal insulation and sound insulation materials. However, the foam glass prepared by this method needs to be basalt mineral powder Mix it with a small amount of quartz and soda ash, melt it at 1450-1520°C, quench it with water, dry it and ball mill it to get basalt glass-breaking clinker powder, and then mix it with other raw materials to make foam glass. The required particle size of the raw material is small, the process is complicated, and the energy consumption High, not suitable for factory production