Steel slag is a by-product in the steelmaking process. It is composed of impurities such as silicon, manganese, phosphorus and sulfur in pig iron oxidized in the smelting process and salts generated by the reaction between these oxides and solvents. It can be used as secondary resources for comprehensive utilization. In addition to the production process of steel slag powder, can steel slag be used to make sand? Can steel slag replace sand to make concrete?Here are the answers.
1. Can steel slag be used to make sand?
Steel slag sand making is possible. Although it is a waste slag produced in the metallurgical industry, after treatment by the sand making machine, it is multi angular, the particle surface is rough and porous, and there are honeycomb fine steel slag particles. Under the action of climate, environmental change or other materials, the steel slag sand has strong compressive capacity, good pit cracking ability, and its performance also meets the sand standard for construction engineering.
Moreover, the production rate is 8-15% of the crude steel output. At present, the production of steel slag increases rapidly with the rapid development of iron and steel industry. Therefore, more and more attention has been paid to the treatment and resource utilization of waste slag in iron and steel enterprises. Steel slag sand making can not only eliminate environmental pollution, but also turn waste into treasure and create economic benefits. It is an effective way for sustainable development, The state also strongly supports it.
2. Can steel slag replace sand to make concrete?
Can steel slag sand be used in concrete? Steel slag can replace sand as concrete, because it has the advantages of high strength, rough surface, good wear resistance and durability, large capacity, good stability and firm combination with asphalt. Compared with ordinary sand, it also has the characteristics of low temperature cracking resistance. Moreover, high-performance concrete cementitious material can be prepared by using the mutual excitability between steel slag sand and blast furnace ore powder and appropriate activator.
At the same time, according to different application requirements, a series of products such as road concrete (high tensile strength, good wear resistance, bending resistance and permeability resistance) and marine concrete (good water permeability, drainage and high adhesion rate of marine organisms) can also be prepared.
3. Production technology of steel slag sand.
What equipment is used for steel slag sand making? It is mainly used to treat steel slag with different particle sizes into 0.25-0.5mm construction sand. From the whole production process, it usually needs to go through multiple links such as crushing, milling and grading. However, it also needs to be combined with raw material particle size, discharge demand, output, site conditions, floor area, investment budget, etc, There are senior engineers to customize the scheme for each customer.
Equipment configuration and process of steel slag sand production line:
Steel slag -> vibrating feeder -> jaw crusher -> cone crusher -> sand making machine -> vibrating screen -> conveyor -> finished sand;
01. First determine the coarse breaking position and arrange it near the treatment plant to reduce the transportation distance of raw materials. The steel slag is evenly and continuously fed to the jaw crusher through the vibrating feeder for coarse breaking, and then sent to the cone crusher by the belt conveyor for secondary processing to meet the particle size required for sand making.
02. After crushing treatment, it is evenly sent to the sand making machine for sand making and shaping. The feed less than 55mm is produced into a size of 0.25-0.5mm, and then transmitted to the next production process.
03. The steel slag enters the vibrating screen through the conveyor. The 4-layer screen can screen 3 kinds of sand at one time. The finished sand is stored or transported to the construction site by pickup truck.
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