Method for producing baking-free brick from industry gypsum waste slag

Abstract

The invention discloses a method by making use of industrial gypsum slag to manufacture baking-free bricks. The method comprises the steps as follows: the pH value of industrial gypsum which is less than 4 is adjusted to be equal to or greater than 4, and the gypsum is crushed into granules with the diameter of less than 10mm; cementing materials occupying the 10 to 40 percent of the total mixed weight are added and the mixture is stirred evenly, then after a mechanical process, the mixture is pressed into adobes, and after drying the adobes become the novel baking-free bricks. The baking-free bricks manufactured through the invention has high compressive strength reaching 7.5 to 13.0 MPa; the strength of the early adobes is high and then the adobes can be directly conveyed and stacked; the adobe is difficult to be broken and the finished-product rate is high; the unit weight of the obtained baking-free brick is light and is more suitable for the construction of high buildings; the manufacturing process is simple and the drying time for the adobes is short and the required stacking area is small; the manufacturing period is short and the manufactured baking-free brick has low cost.

Description

technical field [0001] The invention relates to a method for processing and applying industrial gypsum waste residue, in particular to a method for producing new unburned bricks with industrial gypsum waste residue. Background technique [0002] Taking the wet-process phosphoric acid industry as an example, every ton of phosphoric acid produced in this industry (100% P 2 o 5 ) will produce about 6 tons of phosphogypsum waste residue, and a wet-process phosphoric acid enterprise with an annual output of 200,000 tons will discharge about 1.2 million tons of phosphogypsum waste residue a year. How to deal with and utilize a large amount of phosphogypsum waste residue has always been a problem that plagues the wet-process phosphoric acid industry. Although some phosphogypsum can be used to replace natural gypsum to produce construction gypsum powder, cement retarder, gypsum board and other building material products, the amount of phosphogypsum is far from solving the problem ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for producing new burn-free bricks from industrial gypsum waste residues, by using industrial gypsum waste residues as raw materials to produce qualified and low-cost burn-free bricks, thereby solving the problem of land occupation and environmental protection of industrial gypsum waste residues. Pollution problems, turning waste into treasure, broadening the utilization of industrial gypsum residue, creating social and economic benefits