Refractories are widely used in different high-temperature process industries, such as cement, lime, steel and non-ferrous metals. At present, China consumes about 10 million tons of refractories every year, of which 4 million tons have been used.
If we can recycle the waste refractory materials, it will bring significant economic benefits and comply with the general trend of world environmental protection.
So today, I will give a brief introduction to the recycling process of waste refractory materials. I hope you can know more about how the refractory industry can promote environmental protection!
The recycling process of waste refractory materials can be roughly divided into six stages:
Theoretically, there are four recovery processes:
- Direct use
After the refractory is removed, it is called direct use method.
For the permanent layer and some non main parts, even if the liquid metal container is used for a furnace service, there is little damage, and some refractory materials basically have no change. Therefore, they can be directly used in other non major parts or areas with lower safety requirements.
There are few kinds of refractories that can be recycled by this method, but they can still make the best use of everything and avoid waste.
- Selected use
The refractory materials after use are simply selected and crushed and processed into different granular materials, and then the method used is called selective use method.
Because this method is selected and crushed, it significantly reduces the product quality, but it can still effectively solve the environmental protection problems, recycle and avoid environmental pollution.
- Processing and use
On the basis of selective use technology, further crushing composite particles, physical and chemical processing and treatment are carried out to make the waste refractory closer to the quality level of the original raw materials.
The reason is the same as that the skateboard produced by using the skateboard as the raw material of the skateboard after sorting, crushing and iron removal.
- Synthetic use
Based on the principle of new material synthesis, the following methods can be used to synthesize raw materials after picking and crushing:
a) Add some materials and synthesize new materials by using the principles of chemistry and high temperature physics;
b) It may be of great value to extract pure substances from this raw material, such as metal chromium prepared by purification and reaction from used magnesium chromium brick or high chromium brick;
c) They are processed into micro powder or even nano powder.