Construction waste refers to the general designation of muck, waste concrete, waste bricks and tiles and other wastes produced by people in the production activities of the construction industry such as demolition, construction, decoration and repair. Large-scale resource processing of construction waste into various recycled products to achieve green recycling can not only turn waste into treasure and generate economic benefits, but also reduce the exploitation of natural resources of sand and gravel, and avoid causing new environmental problems. Can the construction waste vertical grinding mill be processed? Guilin Hongcheng vertical mill manufacturer takes advantage of the large-scale, high-efficiency and energy-saving advantages of vertical mills, uses construction waste as raw materials, and can produce two types of recycled building material products at the same time after grinding. One type can be used as recycled fine aggregate for concrete and mortar, and the other type can be used as a substitute for mineral admixtures for concrete or as fine aggregate, and has been successfully operated. Today, I would like to introduce you to the detailed technical process of vertical mill construction waste.
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Facing the diversified processing requirements of construction waste, it is necessary to produce recycled micropowder and recycled sand products. In order to realize multiple uses of one mill, not only new design and improvement of the mill structure are required, but also resource treatment process needs to be further optimized. Combined with the requirements of construction waste treatment, the technological process of vertical mill construction waste is as follows: construction waste pellets (particle size ≤ 20 mm) after sorting, crushing, iron removal, and impurity removal. The bucket elevator is used to send the construction waste slag to the raw material bin, and after the material is measured, it is sent to the vertical mill for grinding by the air lock feeder. After the micropowder product is selected by the powder separator, it is collected by the bag filter, and sent to the regenerated micropowder bin through the conveying equipment (the regenerated micropowder with a specific surface area of 400~800 m/kg can be sorted). At the same time, the sand powder mixture collected by the collection device in the mill can be sieved to obtain reclaimed sand products of ≤5 mm. The regenerated fine powder and regenerated sand prepared by this process can be used in the production of regenerated building materials (regenerated concrete, regenerated mortar, etc.).
Most of the raw materials of vertical mill construction waste are clay bricks, cement stones, crushed mortar, limestone (with a small amount of cement stones inside the surface) and so on. The first three have certain hydration activity after grinding, and the limestone can act as ultra-fine filler after grinding. Regenerated micropowder has a gray appearance, similar to clinker powder and slag powder, because the activity of regenerated micropowder is not as good as cement clinker and slag powder. Therefore, it is necessary to grind the construction waste of the vertical mill more finely to improve the activity.
Studies have shown that the main chemical composition of recycled micropowder is the same as that of ordinary Portland cement and Class II fly ash, but the relative content is not the same. Therefore, it can be inferred that the recycled micropowder has potential activity and is feasible as an admixture for cement-based products. Waste bricks and tiles and waste concrete regenerated micropowder obtained through vertical mill construction waste treatment, after activity testing, all performance indicators have reached the standard of secondary fly ash, and have the potential to be used as active admixtures (replacing fly ash) Value.
If appropriate temperature control and activator are supplemented during the preparation of micropowder, regenerated micropowder with better activity can be obtained. The successful application of using Guilin Hongcheng HLM vertical mill construction waste to produce recycled micropowder provides a new way for the resource application of construction waste. If you want to know more about the application of vertical mill construction waste, please leave us a message for consultation.