Industrial residue phosphogypsum unburned brick and producing method thereof

Abstract

The invention provides an industrial residue phosphogypsum baking-free brick and a manufacturing method thereof. The raw material takes the phosphogypsum as the master batch and sand, sand grains and cement as accessories. The phosphogypsum is crushed, burdened, mixed and molded under the high pressure of 40MPa-85MPa to form green bricks; the product is obtained after short natural maintenance of the green bricks. The invention has the beneficial effects that the phosphorous chemical industrial residue phosphogypsum is effectively utilized so that the stacking of the phosphogypsum produces less pollution to the environment; the phosphogypsum baking-free brick saves energy and land resources and reduces emission compared with the clay sintered bricks; the brick has short production period, low cost and no radioactive pollution; the brick is a novel high quality baking-free brick which has high tensile and compressive strength and neat appearance, reaches the national JC239-2001 standard and is used for buildings.

Description

technical field [0001] The invention relates to a non-burning phosphogypsum brick for construction engineering, in particular to a non-burning brick using phosphogypsum, waste residue from the phosphating industry, as a main raw material and a production method thereof. Background technique [0002] With the development of the phosphating industry in our country, 25-30 million tons of phosphogypsum will be discharged every year, and no more than 10% of the effective utilization will be used. Land acquisition and stacking have always been the main method. According to the stacking height of 30 meters, the annual area is about 1,000 mu, and It causes certain pollution to the environment and brings great pressure to the sustainable development of enterprises. [0003] According to the statistical data of our country 10 years ago, 700 billion pieces of clay fired bricks are used every year. If 50% of them are shale bricks, 160,000 to 200,000 mu of land will be used to burn brick...

AI Technical Summary

Problems solved by technology

[0004] A kind of " phosphogypsum burn-free brick and its production process " (publication number: CN1277168A) disclosed in Chinese patent literature, although its raw material is based on industrial waste phosphogypsum, with auxiliary material sand and additives (cement, or cooked Gypsum, etc.), the finished product is made through batching, mixing, high-pressure molding, and curing processes, but there are several problems: 1. There is no sand (rice stone) that acts as an aggregate in the formula, so the flexural resistance of unburned bricks reaches Less than the national standard; 2. Although the pressure of high-pressure forming is proposed to be 600KN ~ 2600KN, it cannot be implemented because there is no aggregate in the formula that does not meet the requirements for fracture resistance; 3. The curing period of 5 days is too short, etc.

Therefore, the flexural strength of the phosphogypsum unfired bricks produced is 1.2-2.0MPa, and the compressive strength is 7.5-9.9Mpa, which do not meet the requirements of the national JC239-2001 standard for building bricks.