Key words: High-efficiency, fine slag, crushing equipment,slag
The complex structure of steel slag is a combination of slag and iron, which are intermingled with each other. Under the premise of ensuring the grade of magnetically selected slag steel (slag steel particles), steel slag is crushed to 75mm after magnetic separation, there is still about 4% to 6% of metal iron in the tailings; crushed to 35mm after magnetic separation, there is about 3% to 5% of metal iron in the tailings; when crushed to 10mm after magnetic separation, the remaining metal iron in the tailings can be reduced to about 1%. It can be seen that the steel slag crushing to the finest possible particle size, can improve the recovery rate of iron metal.
Jaw crusher, roller crusher, hammer crusher, impact crusher, hydraulic cone crusher and rod mill are the main crushing equipments used in iron and steel enterprises.
Jaw crusher adopts the principle of four-bar mechanism, using the connecting rod as the movable jaw, and the connecting rod swings back and forth periodically with the rotation of the crank, using the method of crushing and bending to produce crushing effect on the material. Jaw crushers are mainly used for coarse and medium crushing of various materials in the mining, highway and chemical industries, but not for fine crushing.
Roll crusher can crush steel slag up to 10mm, the main disadvantage of the product size is prone to change, the processing of steel slag product size is not uniform, only closed-circuit work, in a larger amount of circulation to get a finer product; In addition, the production of steel slag is prone to splash, affecting the environmental safety, the use of higher costs.
Hammer crusher is the use of high-speed rotary hammer blow and crushing. Due to the hardness of steel slag, different materials such as high chromium hammer and ultra-high manganese hammer are not durable and wear seriously. In addition, it has relatively large installed power.
Hydraulic cone crushers are used for fine crushing of soft-hardness ores in mines, and can generally produce crushing products of 20 to 45 mm. To achieve a 12 mm feed size, a closed-circuit configuration of screening and return circulation is required. If a closed circuit configuration is used for this purpose, the circulating load is high and the operating efficiency is low.
Rod mill is equipped with appropriate grinding media steel rods in the cylinder, the installed power of the equipment is large, the grinding media wear fast, high metal loss; there is poor stability of the products; and the production cost is very high.
High-efficiency fine crushing process and equipment use optimised GYP series inertia cone crusher as steel slag fine crushing equipment. The GYP series inertia cone crusher adopts universal joint flexible transmission technology, which can not only crush steel slag to a very fine size, but also flatten the slag and discharge it without circulating load, and it can crush slag to less than 6-10mm, and the metal iron content of the tailing slag can be reduced to less than 1%.
