Manufacturing method for burning light burning magnesite powder by tunnel kiln

Abstract

A Manufacturing method for burning light burning magnesite powder by a tunnel kiln comprises following steps: a. optionally selecting one of magnesite flotation ore concentrate, magnesite flotation tailings, magnesite ore crushing or magnesite shaft kiln dust removing powder, producing into briquette; b. drying the briquette obtained in step a in a drier; c. the sum of the longitudinal passage sectional area between the piled bricks conforming that: (1) the ratio of the sum of the longitudinal passage sectional area between the piled bricks and the sectional area of the kiln chamber is 30-40:100; (2) the ratio of the sum of the sectional area of the external passage formed by a piled brick, a kiln wall and a kiln top and the sum of the sectional area of the longitudinal interior passage between piled bricks is 1.1-1.4; d. pushing the kiln car loading briquettes into the tunnel kiln, wherein the kiln inlet temperature is 100-200 DEG C, holding for 30-60 minutes at 850-900 DEG C and the kiln outlet temperature is 40-200 DEG C; e, after kiln discharge, smashing the briquette obtained in step d into particles with the diameter less than 0.074mm.

Description

technical field [0001] The invention relates to a production method for firing lightly burned magnesium powder, in particular to a production method for firing lightly burned magnesium powder using a tunnel kiln. Background technique [0002] Because natural magnesite contains impurity minerals, in order to comprehensively utilize mine resources, magnesite must be beneficiated. "Flotation" technology is the main beneficiation method of magnesite. The main content of the flotation technology is to first crush the natural magnesite into fine particles (generally through a 100 mesh sieve, that is, the particle size is ≤0.15mm) and mix it with water to form a slurry, and then add appropriate reagents for flotation to achieve magnesite at all levels. Separation, after light burning as raw material used in different products. In addition, in the process of magnesite mining, about 30% of crushed ore (particle size ≤ 30mm) and dust removal powder (particle size ≤ 0.15mm) produced b...

AI Technical Summary

Problems solved by technology

If the adobes are evenly laid on the trolley without any gaps, and there is no air flow channel between the adobes to control, the large temperature difference between the top and bottom of the kiln cross section will cause uneven heating of the brick pile and increase the number of underfired products.

If the firing time is prolonged, it will not only waste energy, but also cause over-burning of the upper part and under-firing of the lower part (especially the bottom)

The patent ZL200510046995.6 lays the magnesite raw material evenly on the trolley and burns it in the tunnel kiln, which has the above disadvantages. It is difficult to ensure the uniform calcination of the magnesite crushed ore less than 25mm and the high activity of the lightly burned magnesium powder.

Patent application 200610047061.9 Although the magnesite crushed ore (≤50mm) is made into adobe and coded on the trolley, and the magnesite block material (50-200mm) is put into the storage frame made of refractory material and coded on the trolley Firing in a tunnel kiln also does not solve the problem of large temperature difference between the top and bottom of the cross section of the tunnel kiln, which causes the upper part to be over-fired and the lower part to be under-fired, resulting in uneven product quality (mainly referring to activity).

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