Views: 8934 Author: Site Editor Publish Time: 2010-09-27 Origin: Site
I. Project overview
Date of signing: 2010-09-26
Processing material: Dolomite
Processing capacity: 25,000 tons/year
Equipment configuration: vertical preheater, rotary kiln system equipment, refractory materials
Xinjiang Magnesium metal production line project purchased vertical preheater rotary kiln system equipment and refractory materials from Zhengmine Machinery, and the energy-saving and environmental protection performance of our equipment met the needs of its industrial structure transformation.
II. Solution
The new Pijiang magnesium smelting process with mature, reliable and reasonable technology is adopted in the process selection of metal magnesium smelting. Including raw material reserve, dolomite calcination, grinding ball, reduction and refining sections.
Raw material reserve
Dolomite is crushed in the mine to meet the required particle size, and stored in the dolomite yard. Ferrosilicon and fluorite are stored directly in the factory warehouse. Reserves are considered according to the consumption required for half a month of production.
Dolomite calcining workshop
Choose energy-saving and environment-friendly rotary kiln, with vertical preheater and vertical cooler. The dolomite with external particle size and quality that meet the requirements is discharged to the material yard, the loading machine carries out the material stacking and collecting operation, and the vibrating screen carries out the screening after that, the dolomite with 10 ~ 40mm particle size is transported by belt to the top silo of the vertical preheater of the rotary kiln, and enters the preheater through the material pipe to exchange heat with the high temperature flue gas flowing from the rotary kiln, and the material is preheated to more than 800℃. After falling into the transfer chute, it is calcined into active calcined white in the rotary kiln at high temperature of 1250℃, and then discharged into the cooler, where the high temperature calcined white is exchanged with the cold air pumped into the fan, the active calcined white is cooled below 100℃, and the air is preheated to more than 600℃. After cooling, the activated calcined white is discharged from the cooler and transported to the ball making workshop by the scale conveyor. The DCS central control system with advanced technology and reliable performance is adopted in the whole line, and the operation and management are centralized in the main control room.
The high-temperature flue gas produced by the combustion of rotary kiln, after heat exchange with dolomite in the preheater, the temperature drops below 250~280℃, and then enters the bag dust collector, and is discharged into the atmosphere by the high-temperature fan after dust removal, and the dust concentration of the discharged gas is less than 30mg/m3.
Pelletizing plant
The calcined dolomite is put into the 1 # silo by the elevator for reserve; The ferrosilicon is broken by the jaw crusher to less than 20mm, and lifted by the elevator into the 2 # ferrosilicon block storage bin for use; Fluorite powder is raised into the silo by a single bucket. The three raw materials stored in the storage bin are continuously mixed into the ball mill by microcomputer control, and the particle size is < 100 mesh. The mixed powder is then passed through the elevator, the storage bin, and the buried scraper conveyor, and enters the ball press to make pellets. The batching system uses an intelligent control system, and the whole process is fully automated by computer monitoring. The ball mill is driven by 10kV high voltage motor, which reduces the power consumption loss compared with the original 380V low voltage distribution operation. There are 3 sets of dust removal systems in the ball making workshop. C1# dust removal system is set in the crushing place of ferrosilicon, C2# dust removal system is set in the batching mill, and C3# dust removal system is set in the pressing place. After comprehensive dust removal treatment, the operating environment of the pelletizing workshop is improved compared with the traditional workshop, and the working environment of the workers is improved.
Reduction and refining plant
The reduction furnace adopts high temperature air rapid reversing regenerative combustion technology. The regenerative reduction furnace uses gas as fuel for continuous heating. The pellets are added by the feeder to the reduction tank in the reduction furnace. The magnesium vapor generated by the reduction tank is cooled into crystallized magnesium (coarse magnesium) in the end condenser, and the coarse magnesium is removed and sent to the refining and alloy production line.
III. Project site
