Steel slag is a solid waste produced in metallurgical engineering, and its discharge volume is about 15%-20% of crude steel output. With the rapid development of the iron and steel industry, the discharge of steel slag is increasing rapidly. Therefore, the treatment and resource utilization of steel slag is urgent. Although steel slag is a waste produced in the process of iron and steel production, it has a wide range of uses because it contains many useful minerals and trace elements, as well as other physical and mechanical properties. At present, my country's technology for recycling steel slag is also relatively mature. After the corresponding crushing and powder production lines are used, it can meet the recycling needs of different fields.
steel slag
Uses of steel slag:
1. As a sintering solvent, instead of limestone for recycling
Adding steel slag to sintered ore can not only recover residual steel, iron oxide, calcium oxide and other components in steel slag, but also increase the output of sintered ore, increase the agglomeration rate, reduce the pulverization rate, and increase the yield of finished products. And the main advantage of returning steel slag to blast furnace as solvent is to use CaO in slag to replace limestone, saving solvent consumption. In addition, the higher iron content in steel slag can partially replace limestone, and MgO can replace part of dolomite, increasing the fluidity of slag And stability, improve economic efficiency.
2. As a subgrade cushion for road engineering
Steel slag is a good way to build roads. Steel slag crushed stone has a rough surface, high strength, and good wear resistance. It meets the requirements of road materials. It is firmly combined with asphalt. It has the advantages of interfering with the telecommunications work of the railway system and having good conductivity.
Railway steel slag
3. Production of cement, used in construction engineering materials
Steel slag contains dicalcium silicate and tricalcium silicate similar to Portland cement clinker, and the content of the two is more than 50%. The firing rate of Portland cement clinker is 1400°C, while the formation temperature of steel slag is above 1500°C. The formation temperature of steel slag is high, the crystallization is compact, and the hydration rate is slow. With steel slag as the main component, a certain amount of gypsum and other admixtures are added to support the hydraulic cementitious material after grinding, which is called steel slag cement. At the same time, dispersing enough steel slag into the cement base material can improve the conductivity of concrete. This kind of conductivity and potential sensitivity make it have a very wide range of uses.
4. Improve the pH of the land and restore the environment
Traditionally, lime is mainly used to adjust the pH value of the soil, but there are also some other problems in long-term use, which may cause the imbalance of magnesium, potassium, calcium and other elements and affect plant growth. The Cao contained in the steel slag can neutralize the pH of the soil for a long time, and the steel slag itself contains soluble magnesium and phosphorus elements, which will achieve a better effect than lime in improving the soil.
In addition to these, steel slag can also be made into ceramic products through water quenching process, and used for building artificial algae fields. Although these technologies have not been implemented on a large scale in China, the recycling of steel scrap slag is the general trend.
"Steel slag is a misplaced resource". It can not only eliminate environmental pollution, but also create social benefits by turning waste into wealth. It is an effective way to achieve sustainable development and "zero emissions". The comprehensive utilization of steel slag is of far-reaching significance not only for steel plants, for individuals, but also for the country and society.
The treatment of steel slag mainly includes three processes of crushing, iron removal and powder grinding. The process flow is as follows:
Steel slag processing process
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