Magnesium metal smelting adopts a mature, reliable and reasonable new Pidgeon magnesium smelting process in process selection. Including raw material storage, dolomite calcination, grinding and pressing, reduction and refining, etc.

Raw material reserve

Dolomite is crushed in the mine to meet the required particle size and stored in the dolomite yard in the factory. Ferrosilicon and fluorite are directly stored in the warehouse in the factory. The reserves are all considered based on the amount required for production in half a month.

Dolomite calcination workshop

Use energy-saving and environmentally friendly rotary kiln with vertical preheater and vertical cooler. The external dolomite whose particle size and quality meet the requirements is unloaded to the stockyard. The loader performs stacking and reclaiming operations. After screening by the vibrating screen, the dolomite with a particle size of 10-40mm is transported to the vertical preheater of the rotary kiln via a belt. The top silo enters the preheater through the feed pipe and exchanges heat with the high-temperature flue gas flowing in from the rotary kiln. The material is preheated to above 800℃, and after falling to the transfer chute, it enters the rotary kiln and is calcined at a high temperature of 1250℃ to become active calcined white. Then it is discharged into the cooler, where the high-temperature calcined white exchanges heat with the cold air blown by the fan, and the active calcined white is cooled to below 100°C, and the air is preheated to above 600°C. After cooling, the activated calcined white is discharged from the cooler and transported to the ball making workshop by the scale conveyor. The whole line adopts advanced technology and reliable performance of the DCS central control system, centralized operation and management in the main control room.

The high-temperature flue gas produced by the combustion of the rotary kiln exchanges heat with the dolomite in the preheater, and the temperature drops below 250~280℃, and then enters the bag filter. After the dust is removed, it is discharged into the atmosphere by a high-temperature fan, and the gas is discharged. The dust concentration is less than 30mg/m3.

Ball making workshop

The calcined dolomite is fed into the 1# silo by the elevator for standby; the ferrosilicon is crushed to below 20mm by the jaw crusher, and then it is lifted into the 2# ferrosilicon block storage bin by the elevator for standby; the fluorite powder is lifted into the single bucket. Silo. The three kinds of raw materials stored in the storage bin are continuously mixed and mixed with the ball mill controlled by the microcomputer. The particle size requirement is less than 100 mesh. The mixed powder enters the ball press after passing through the elevator, storage bin, and buried scraper conveyor. Make pellets. The batching system uses an intelligent control system, and the entire process is fully automated by computer monitoring. The ball mill is driven by a 10kV high-voltage motor, which reduces the power consumption loss compared to the original 380V low-voltage power distribution operation. The ball making workshop is equipped with 3 sets of dust removal systems, respectively C1# dust removal system is installed at the ferrosilicon crushing part, C2# dust removal system is installed at the batching grinding, and C3# dust removal system is installed at the pressure ball. After comprehensive dust removal treatment, the operating environment of the ball-making workshop is greatly improved compared with the traditional workshop, and the working environment of workers is improved.

Reduction and refining workshop

The reduction furnace adopts high-temperature air rapid reversing regenerative combustion technology, and the regenerative reduction furnace uses coal gas as fuel for continuous heating. The pellets are fed into the reduction tank in the reduction furnace by the feeder. The magnesium vapor generated in the reduction tank is condensed into crystalline magnesium (crude magnesium) in the end condenser, and the crude magnesium is taken out and sent to the refining and alloy production line.