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(1) Ore crushing
China's concentrating plants generally use crushing, crushing and fine-breaking three-stage crushing process to break iron ore. Large-scale 1.2m or 1.5m rotary crusher (recommended equipment: crushing equipment), 2.1m or 2.2m standard cone crusher in medium break, 2.1m or 2.2m short head cone crusher machine. Through the coarse ore, the blockiness is not more than 1m, and then it is crushed by medium and fine, and sieved into the final product of the ore grain size less than 12mm.
(2) Grinding process
Most of China's iron ore grinding process uses two-stage grinding process, and small and medium-sized ore dressing plants use a grinding process. Due to the use of fine screening and re-grinding new processes, in recent years some concentrating plants have changed from two-stage grinding to three-stage grinding. The grinding equipment used is generally small, the largest ball mill (mechanical: horizontal ball mill) 3.6m × 6m, the largest rod mill 3.2m × 4.5m, the largest self-grinding mill 5.5m × 1.8m, the gravel mill 2.7m × 3.6 m.
The classification after grinding is basically a spiral classifier. In order to improve efficiency, some concentrators use hydrocyclones to replace the secondary spiral classifier.
(3) Sorting technology
Magnetite ore dressing: It is mainly used to select low-grade "Anshan-style" magnetite. Due to the strong magnetic properties of the ore and good grinding, the domestic magnetic separation plant adopts stage grinding and multi-stage grinding process. For the coarse-grained magnetite, the former (a section of grinding), fine-grained and fine-grained inlays are used. The magnetite uses the latter (two or three stages of grinding). The series of permanent magnetization developed by China has made the magnetic separator realize permanent magnetization. 70 years later, due to the magnetite concentrator in the country to promote a fine sieve and then grinding the new technology, the concentrate grade increased from 62% to about 66%, to achieve the requirements of the Ministry of metallurgical industry proposed concentrate grade of 65%.
(4) Sintering pellet technology
Sintering technology is the main means of man-made rich ore in China. In 1996, a total of 196.956 million tons of man-made rich ore were produced, of which 94.859 million tons were key enterprises, accounting for 58.9%, and 63.37 million tons were local state-owned enterprises, accounting for 38.1%.
China has reached a considerable level in the technology of fine concentrate sintering. As early as the early 1950s, Angang successfully changed the acid sinter production method to the alkaline sinter production method on the sintering machine, and solved the problem of fine concentrate sintering in the world with slaked lime or quicklime as the flux.
The equipment level of the sintered pellets has also improved. There are 419 sintering machines in the country with a total area of ​​15522 m2, of which 22 are sintering machines of 130 m2 or higher, with a total area of ​​4107 m2; 197 sets of sintering machines of 24 to 129 m2, with a total area of ​​9387 m2; 200 sets of sintering machines of less than 24m2, with a total area of ​​2028m2. The 300m2 sintering machine put into operation at Maanshan Iron and Steel Plant on February 24th, 1994 is the largest modern sintering machine designed, manufactured and constructed by ourselves in addition to Baosteel.
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