Manufacturing method for burning light burning magnesite powder by tunnel kiln

A light-burned magnesium powder and production method technology, which is applied in the production field of firing light-burned magnesium powder in a tunnel kiln, can solve the problem of large temperature difference between the upper and lower sections of the tunnel kiln, over-burning of the upper part and under-burning of the lower part, prolonging the firing time, Waste of energy and other issues, to achieve the effect of improving temperature uniformity and heat transfer conditions, shortening high-temperature calcination time, and reducing fuel consumption

Inactive Publication Date: 2009-10-28
海城华宇耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 cal...

Method used

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  • Manufacturing method for burning light burning magnesite powder by tunnel kiln

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 900 kg of magnesite flotation tailings (particle size ≤ 0.15mm) and 100 kg of lightly burned magnesium powder (particle size ≤ 0.074mm) according to the mass method, mix them evenly in the kneader, and machine them into bricks. The bricks are: Length×width×thickness=230×130×30mm, dried at 180-200° C. for 6 hours, and loaded on the tunnel kiln car platform 6 with longitudinal flame channels.

[0039] Such as figure 1 As shown, there is a layer of permeable bricks 5 on the table of the kiln car 6, and brick stacks 7 are stacked on the fire bricks. The channel 4 in the stack should be straight in the vertical direction, and the gap 1 formed between the brick stack 7 and the kiln side wall 2 and the top wall 8 is an outer channel.

[0040] The sum of the cross-sectional area of ​​the longitudinal channels of the brick stacks is 0.58 square meters, and the cross-sectional area of ​​the kiln cavity is 1.87 square meters; the sum of the cross-sectional areas of the outer...

Embodiment 2

[0045] Take 800 kg of magnesite flotation tailings (particle size ≤ 0.15mm) according to the mass method, mix them evenly in the kneader, and machine them into adobe. The adobe is: length × width × thickness = 250 × 130 × 50mm. Dried at 130°C for 12 hours, loaded on tunnel kiln cars with longitudinal flame passages, and the longitudinal passages between brick stacks should be straight. Such as figure 1 As shown, there is a layer of permeable bricks 5 on the table of the kiln car 6, and brick stacks 7 are stacked on the fire bricks. The channel 4 in the stack should be straight in the vertical direction, and the gap 1 formed between the brick stack 7 and the kiln side wall 2 and the top wall 8 is an outer channel.

[0046] The sum of the cross-sectional area of ​​the longitudinal channels of the brick stacks is 0.74 square meters, and the cross-sectional area of ​​the kiln cavity is 1.87 square meters; the sum of the cross-sectional areas of the outer channels of the brick sta...

Embodiment 3

[0051] According to the mass method, take 800 kg of magnesite flotation tailings (particle size ≤ 0.15mm) and mix them evenly in the kneader, and then machine them into a brick. Dried at 180°C for 12 hours, loaded on tunnel kiln cars with longitudinal flame passages, and the longitudinal passages between brick stacks should be straight.

[0052] Such as figure 1 As shown, there is a layer of permeable bricks 5 on the table of the kiln car 6, and brick stacks 7 are stacked on the fire bricks. The channel 4 in the stack should be straight in the vertical direction, and the gap 1 formed between the brick stack 7 and the kiln side wall 2 and the top wall 8 is an outer channel.

[0053] The sum of the cross-sectional area of ​​the longitudinal channels of the brick stacks is 0.66 square meters, and the cross-sectional area of ​​the kiln cavity is 1.87 square meters; the sum of the cross-sectional areas of the outer channels of the brick stacks is 0.37 square meters; The sum of th...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C04B2/10
Inventor 李广达张永禄
Owner 海城华宇耐火材料有限公司
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