Application of coal gasification slag in construction materials

The application of coal gasification slag in construction materials mainly includes the preparation of ceramsite, cement, concrete, wall materials and bricks, etc., which is an important way for the large-scale consumption of coal gasification slag.

1 coal gasification slag as aggregate
Ceramsite has excellent properties such as fire resistance, high strength, good shock resistance, thermal insulation, etc. It is widely used in the fields of construction engineering, refractory materials and light aggregates. At present, the preparation method of ceramsite is mainly shale and clay ceramsite, which will cause serious environmental damage.

2 Preparation of cementitious material from coal gasification slag
The chemical composition of coal gasification slag is mainly SiO2, Al2O3, Fe2O3, CaO, etc., which is similar to Portland cement, and has certain pozzolanic activity. It is an excellent cement raw material.

3. Preparation of wall materials from coal gasification slag
Using the residual carbon in the gasification slag as a pore-forming agent and an internal fuel can reduce the density and thermal conductivity of the sintered product, thereby preparing a wall material with thermal insulation and low density.

4 Preparation of non-burning bricks from coal gasification slag
In recent years, with the increasing pressure of environmental protection, traditional brick-burning enterprises have difficulty in survival, some clay brick-burning enterprises have been closed down, and brick prices have risen. The preparation process of unburned bricks is energy-saving and environmentally friendly, and has a good development prospect.