Method and apparatus for light-burning magnesium powder for rotary kiln

Abstract

The invention relates to a method and a device for soft burning of magnesium powder through a rotary kiln which relate to the technology of soft burning of magnesite pulverized powder, in particular to a method for producing the soft burning magnesium powder by utilization of the rotary kiln. The invention aims to provide a method for fair current soft burning of the magnesium powder through the rotary kiln with low investment, quickness in taking effect and high magnesia activity. The other aim of the invention is to provide a device for implementing the method. The method is as follows: materials and flame after magnesite is crushed enter from the high end of the rotary kiln, are led out from a draught fan on the outside of the low end, and perform fair current heat exchange in the rotary kiln. The device adopts the following structure: the rotary kiln comprises a kiln body; the high end and the low end of the kiln body are respectively provided with a support bracket; and motors on the support brackets are connected with the kiln body through driving mechanisms. The structural key points of the device are as follows: a material hopper and a burner are arranged outside an inlet on the high end of the kiln body, and the draught fan is arranged outside an outlet on the low end of the kiln body.

Description

Technical field: [0001] The invention relates to the technology of light-burned magnesite crushed powder, in particular to a method and a device for producing light-burned magnesium powder by using a rotary kiln. Background technique: [0002] In order to improve the activity of magnesium oxide (MgO), the general method is to add magnesite (MgCO 3 ) to carry out light burning activation treatment: [0003] [0004] The activity of magnesium oxide is directly related to the light burning temperature. Magnesite (MgCO 3 ) has a decomposition temperature of about 700°C, and the magnesium oxide (MgO) produced by decomposition at this temperature has a small particle size and a high activity. No matter how low the temperature is, the magnesite cannot be decomposed, resulting in "burning" and producing raw materials; if the temperature is increased, the polycrystal of magnesium oxide particles will cause "dead burning", and the activity will become smaller. How to control th...

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Problems solved by technology

[0006] The method of calcining active magnesia in the fluidized counterflow rotary kiln described in the utility model patent ZL200420115666.3 and the invention patent application number 200510108342.6 is also inapplicable to lightly burned magnesite powder

[0007] Suspension furnace is an advanced equipment for light-burned magnesite fine powder raw material (particle size<0.088mm), but due to the complex and huge structure and high equipment cost (70-80 million yuan / set), general enterprises cannot afford to purchase; The magnesite fine powder produced during the mining process of magnesite is piled up around the mining area. There are tens of millions of tons in Haicheng and Dashiqiao alone, seriously polluting the surrounding environment.

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