Iron tailings baking-free brick and preparation method

Abstract

The invention discloses an iron tailings baking-free brick and a preparation method thereof. The iron tailings baking-free brick is prepared from the following main raw materials in percentage by mass: 50 to 70 percent of iron tailings, 5 to 8 percent of iron ore waste stone nitrate, 5 to 8 percent of steel slag, 15 to 20 percent of cement, 2 to 5 percent of gypsum, 1 to 3 percent of adhesive, 3to 5 percent of straw and 10 to 15 percent of water. The preparation method comprises the following steps: carrying out primary machining on the raw materials, burdening in proportions after meeting abrick-making requirement, then uniformly mixing and stirring, carrying out compression molding under the molding pressure of 20 to 25 MPa, and naturally curing for 21 days at normal temperature, thuspreparing the iron tailings baking-free brick. According to the iron tailings baking-free brick disclosed by the invention, the problems that an iron tailings baking-free brick prepared in an original mode is easy to crack, easy to shrink and low in strength can be favorably improved, the strength can be up to MU20 grade or above, and the iron tailings baking-free brick has the characteristics ofhigh rate of qualified products, high strength, no need of autoclaved curing, low brick-making cost and the like, is a novel building material for partially replacing sintered clay bricks, is beneficial for increasing the resource utilization rate, reducing land occupation of tailings and improving the environment, and has good economic benefit and good social benefit.

Description

technical field [0001] The invention belongs to the field of building materials and environmental protection, and relates to an unburned iron tailing brick and a preparation method thereof. Background technique [0002] Iron tailings are the waste residue left after the iron ore has been selected into useful mineral iron powder. It is the industrial waste discharged from the iron ore dressing plant. The annual discharge of iron ore tailings in my country is about 150 million tons. Iron tailings The stockpile has reached several billion tons, which not only takes up a lot of land, but also causes environmental pollution, destroys the ecological balance, and even produces geological disasters. At present, some mines try to use iron tailings to make unburned bricks. Due to the proportion of unburned bricks According to different production processes, unburned bricks have some differences in strength, frost resistance, production cost, etc. At present, iron tailings unburned brick...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the common problems of low strength, easy cracking, easy shrinkage, easy deformation and high production cost of iron tailings unburned bricks in the prior art described in the background technology, the present invention provides an iron tailings unburned brick and The preparation method, the iron tailings non-fired brick provided by the invention, has a strength above MU20, is not prone to unqualified conditions such as cracking, shrinkage and deformation, and the production cost is not high

Images