What is fly ash? Fly ash is generally referred to as the small ash particles discharged by the fuel (mainly coal combustion) during the burning process; the particle size is usually between 1-100μm. Fly ash can be generated in coal-fired power plants and urban central heating boilers fueled by pulverized coal.
Why are we talking about the treatment of fly ash? There are two reasons: environmental protection and economic benefits. Taking China for example, fly ash is one of the largest industrial waste in China, with an annual output of 600 million tons, the existence of a large number of fly ash not only pollutes the environment but also hinders the sustainable development of the coal industry.
As for the economic benefits, after processing and recovery, fly ash has a very wide range of uses, can be really recognized as “gold”. Adding fly ash to concrete can enhance and improve the workability of concrete, effectively inhibit the bleeding of newly mixed concrete, improve the strength and durability of concrete in later use, and effectively reduce the hydration heat of concrete. In addition, fly ash is also widely used in cement, building materials, agriculture, papermaking, environmental protection, and other fields.
Therefore, to achieve comprehensive utilization of fly ash, the garbage into “treasure”, is currently a major topic in the field of fly ash recycling needs to be studied!
How to turn fly ash into wealth? Now we must mention fly ash processing plant, which is an effective solution for fly ash recycling.
The whole fly ash processing plant can be divided into seven sections, including crushing, conveying, feeding, grinding, classifying, dust collection, and storing. Common equipment used in fly ash processing plants includes crusher, Raymond mill, bucket elevator, vibrating feeder, classifier, dust collector, etc.
- use the crusher to break the fly ash.
- The material to be pulverized is sent to the center of the rotating disc by the locking air-feeding equipment. Under the action of the roller pressure, the material is crushed by extrusion, grinding, and shearing.
- on the one hand, the coarse-grained material is blown back to the grinding disc for re-grinding, on the other hand, the suspended material is dried, and the fine powder is brought into the grading machine by hot air.
- qualified fine powder with the air flow out of the mill, collected by the dust collection equipment is the product, unqualified powder continues to fall into the mill grinding.
The fineness of fly ash
Fineness is an important parameter for evaluating fly ash, which reflects the quality of fly ash to a large extent. is the finer the better? According to the relevant standards, the finer the better, because the classification of fly ash is mainly divided by fineness, and the finer is grade I, usually the fineness of primary fly ash is not more than 12%, and the fineness of secondary fly ash is not more than 30%.
The finer the fly ash, the more rapid and complete the reaction of the ash, so the higher the activity, the concrete has a higher strength performance, in addition, cement particle size difference, the composite use of the two can fill the void with each other so that the mixed system composed of the two can reduce the voltage, reduce the water demand. The better the filling effect, the lower the water demand ratio.
The particle size of fly ash is generally between 1-100 microns; most of them are spherical, the surface is rough, and the edges are more, after fine grinding into 80-360 mesh, but what mill is good for grinding fly ash? Raymond mill, high strength mill, high-pressure mills, ultrafine mill, and fly ash ball mill are common on the market, with different characteristics and performance, according to the raw material situation, we recommend Raymond mill, specific fly ash grinding process is as follows:
The whole Raymond mill is a three-dimensional structure, that covers an area of small, systematic, from raw material rough processing to transport to powder, packaging, independent production system, fine and uniform powder, high screening rate, small footprint, intelligent operating system, coupled with new pulse dust removal equipment, dust removal thoroughly, reduce pollution, uniform discharge, high sorting accuracy, finished fine powder quality.
If you want to invest in fly ash and get benefits as soon as possible, please contact our technicians. We provide a series of customized services, from program design, transportation, and installation to post-production guidance and after-sales testing, which saves users a lot of investment and operating costs.
