metal magnesium calcined MgOCaO production line

using the rotary to make the Dolomite to be MgO and Cao and then to metel Mg.
100mt,200mt and 300mt per day

Smelting technology, the process of Pidgeon's magnesium reduction includes:
1.dolomite calcining: heat up the dolomite which crushed into D30~40mm to 1100~1200°C in the rotary kiln, calcine into MgOCaO.
2.Ball milling: grind the calcined dolomite, silicon iron, fluorite into 100 item above fine powder separately.
3.Dosing for a ball: dosing the MgOCaO, silicon iron powder and fluorite powder, compressed into the ball.
4.Reduction: heat the ball in the reduction tank to 1200+10°C, in 13.3 Pa or higher vacuum condition, keep for 8-10 hours, magnesium oxide revert to magnesium steam, then turn into rough magnesium after condensation.
5.Refining and ingot casting: melt the rough magnesium in the heat, under about 710°C high temperature, after refined by flux, the rough magnesium was casted into refined magnesium.
Our company specializes in manufacturing the whole product line of dolomite, magnesite and serpentine calcined into MgOCaO.
Calcined MgOCaO product line is composed of three main machineries—vertical preheater, rotary kiln and vertical cooler, and pulverized coal preparation system.
Put the qualified crushed dolomite into the bunker, then hoist and transport it into the top bunker of the preheater. The charging quantity of the preheater top bunker is controlled by two level indicators upper and lower, then through the feeding tube distribute the dolomite uniformly into every room of the preheater.
The dolomite heated by the high temperature flue gas in the tail of rotary kiln, then pushed back into the rotary kiln by hydraulic push rod. The dolomite is calcined into MgOCaO in the rotary kiln under 1100-1200°C high temperature, then enter into the cooler, it will be discharged after cooled by the cooling air , through the hot-air by heat exchange entre into the kiln. The exhaust gas will enter into a bag filter after cooled by air cooler, then get into chimney.
,Equipment Introduction
Vertical preheater
On the top of the preheater is a bunker with level indicator to control the height of feed layer; the bunker is connected with the preheater by a sliding feeding pipe, and the dolomite will be transported into preheater through this pipe, in addition the pipe could seal the material and prevent cold enter into the preheater. After row material enter into the preheater, take advantage of the hot flue gas released after caclining to backward flow towards feeding direction , have a full heat exchange to make the materials preheated uniformly, then the material will be pushed into kiln by means of every hydraulic push rod to shorten the calcining time of material in the kiln. The gas released after heat exchange will be injected into the atmosphere after treatment by dust catcher.
2. Rotary kiln
The rotary kiln is the key equipment for active dolomite which composed with barrel, gearing device, riding and catch wheel supporting device, kiln head, kiln tail sealing, cover of kiln head and combustion apparatus etc.
The barrel of rotary kiln is rotating component of heating which made of high quality steel plate with flange welding, and have a certain inclination with the level, the whole kiln body is supported by riding wheel device, and has a mechanical or hydraulic catch wheel device to control axial movement of the kiln. Transmission device makes the barrel body rotating according to the requirement through the gear in the middle of the barrel. The transmission part not only include DC or frequency conversion motor but also include auxiliary transmission device, which can keep the kiln rotate in low speed and prevent deformation when installing, maintaining and main transmission power down. In order to prevent cool air get into and flue gas out of the rotary kiln, a reliable kiln tail and head composite fish scale sealing device are installed on both feeding (tail) and discharging (head) hole. The rotary kiln in bigger diameter and shorter length is usually used in the engineering; it can not only reduce the fluctuating range, extend accretion forming cycle but also save the area.
The rotary kiln is the key equipment for calcining MgOCaO, which composed with barrel, gearing device, riding and catch wheel supporting device, kiln head, kiln tail sealing, cover of kiln head and combustion apparatus etc.
Vertical cooler
The high temperature material calcined in rotary kiln flow into the vertical cooler inlaid with fire-proof material. The cooler has four cooling discharging holes, and the discharging speed of everyone could be controlled separately according to the material temperature. Central blast cap and chamber cooling cap are distributed in the cooler uniformly, and the blast cap connected with fan by tube, material layer piled up on the blast cap sprinkling downward along generatrix of blast cap, and have conversely contact with the cooling air released from the gas hole of every layer in the blast cap, completing heat exchange. The material that cooled to 80°C+ environmental temperature is discharged from the cooler gradually by the action of vibrating unloader. The heated air enters into the rotary kiln directly though kiln head cover, which as secondary air to participate in combustion. The cooler has no moving parts, simply structure, good cooling effect, and little equipment maintenance.