1. Project Overview

A company from Pakistan has the high reserves of high-quality magnesite mineral with the following chemical composition:

According to market demand, the Company would like to calcine the magnesite to improve the MgO composition. High purity magnesium oxide has a great market demand, its main application are as follows:

The DBM has the very widely market. It can be used in High Purity Series:

ZH-ARL is high purity product mainly used for camouflage coatings, chemical reagent, ceramics.

ZH-V2-1 is mainly used for microwave dielecdtric ceramics, magnesium lactate, thermal conductive plastics, rubber, copple, etc.

ZH-V2-2 is mainly used for microwave dielectric ceramics, crayon, desiccant, enamel etc.

ZH-V2-3, ZH-V2-4 These models are used for petroleum catalyst.

ZH-V3 is mainly used for acrylic acid magnesium, medical intermediates, microwave dielectric ceramics, liquid crystal glass etc.

ZH-V3H is high purity product mainly used for phosphating solution, magnesium stearate, vinegar tablets, liquid crystal glass, petroleum catalyst, styrene-acrylic emulsion, cosmetics, magnesium aspartate etc.

2. Industrial Series

ZH-V4I is mainly used for manhole covers, nitrile rubber foam, sillicone rubber, CPE magnesium oxide, magnesium stearate, dental impression material etc.

ZH-V4 is used for mictrowave dielectric ceramics.

ZH-V5-1 is 95% purity used for cement accelerator, water treatment etc.

ZH-V5-2 is 93% purity used for potassium monopersulfate.

ZH-V5-3 is 90% purity used for desillication, water treatment etc.

ZH-V5-4 is 85% purity used for is desillication, water treatment etc.

3. Project Engineering Concept

According to the laboratory test, The most suitable calcination temperature and process route were found. The engineering of the whole factory process flow and the manufacturing of equipment shall have a reasonable and reliable basis. Bag dust collector is used to treat the flue gas of kiln tail and achieve standard emission.

Project Implementation：

The particle size of magnesite obtained by crushing and screening is 30-60mm, and then the qualified particle size of magnesite is sent into the dumping hopper by front loader. A bar valve is set below the dumping hopper to control the discharge volume of the raw material. The material in the dumping hopper is fed into the bucket elevator by belt conveyor. The bucket elevator lifts the material to the buffer silo. The buffer silo plays a guarantee role in the stable production of follow-up equipment. At the same time, it shall  convenient the front feeding equipment maintenance work. The buffer silo is equipped with bar valve to control the discharge volume, and the belt scale weigher is set under the valve for accurate and uniform feeding. The material enters the rotary kiln through the double - layer double - door hammer air lock valve through the heat - resistant chute. Double - layer double - door hammer lock valve plays the role of air lock. The material successively passes through the preheating zone, calcining zone and cooling zone of the rotary kiln. The axial fans are arranged outside the calcining zone to control the temperature of kiln skin and protect the kiln body. The material calcined by the rotary kiln enters the rotary cooling machine through the chute of the kiln head. Rotary coolers makes the heat exchange with air to cool the material. After cooling the material through the bucket elevator into the final product silo for storage. Bag filter is set on the top of final product silo to control dust emission. The bar valve is set under the final product storage silo to facilitate the subsequent packaging and transportation.

The burner adopts oil-gas integrated burner, which has flexible operation and strong adaptability, and can be applied to fuel oil and gas. Burner operation is safe, stable, reliable and energy saving. The burner is equipped with roots blower to provide primary air. In the cooling machine, the air heated by heat exchange enters the rotary kiln as a secondary air to participate in combustion, so as to realize the purpose of energy saving.

For the flue gas discharged from the end of the kiln, it firstly enters the cyclone dust collector for settling the larger particles in the flue gas. Then the gas enters the mechanical air cooler. The mechanical air cooler forces the flue gas to cool down to protect the bag dust collector behind it. The cold air valve is also provided before entering the bag dust collector, which plays a role in reducing the flue gas temperature as the last insurance. Bag filter adopts FMS high temperature resistant filter bag, which can achieve high filtration efficiency and achieve standard emission. High temperature fan is set after bag filter to provide negative pressure operating environment for the whole calcining system.

4. Technical Parameter of Main Equipment