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Molybdenum-tailings microcrystal foaming material and preparation method thereof

A technology of microcrystalline foaming and molybdenum tailings, which is applied in the field of building materials, can solve the problems of insufficient utilization of tailings resources, unstable firing temperature, and excessive addition of auxiliary materials, and achieve stable and improved chemical composition and physical properties. Quality, low water absorption effect

Active Publication Date: 2019-04-16
河北恒钏建筑材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent application 105060717A discloses a building decorative glass-ceramic with molybdenum tailings as the main raw material and its preparation method. The utilization rate is about 40%, and the utilization rate is low. The sintering temperature is also high, which is not conducive to saving resources.
[0007] To sum up, in the field of preparing foamed ceramics from tailings, the utilization ratio of tailings is at most 75%, and the utilization rate is relatively low. There are problems such as unstable firing temperature of broken plates, difficult quality control, etc. The amount of other auxiliary materials added is too large, and tailings resources cannot be fully utilized. The product has disadvantages such as uneven pores, low strength, and poor stability.

Method used

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  • Molybdenum-tailings microcrystal foaming material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Get 92% molybdenum tailings, 2% silicon carbide, 5% iron tailings, 0.5% boron nitride, 0.5% aluminum nitride, grind to 350 mesh in a ball mill, mix and stir, ingredients;

[0038] (2) Control the moisture content of the ingredients within 5%, and use the air distribution system and pneumatic conveying system to transport it to the granulation tower; then use the multi-mouth water atomization system to atomize and humidify the ingredients to 10% for granulation, Finally, it is dried at 200°C to obtain pellets.

[0039] (3) Put the pellets into the mold with an automatic distributing machine, first raise the temperature to 300°C at a rate of 20°C / min, and keep warm for 0.75h; then raise the temperature to 800°C at a speed of 20°C / min, and keep warm for 0.75h; finally Raise the temperature to 1190°C at a rate of 10°C / min, hold for 25 minutes, and sinter to shape;

[0040] (4) First cool down to 800°C at a rate of 5°C / min and hold for 1.5h; then cool down to 400°C at ...

Embodiment 2

[0042] (1) Get 90% molybdenum tailings, 0.5% silicon carbide, 0.5% sodium bicarbonate, 8% iron tailings, 0.2% boron nitride, and 0.8% aluminum nitride, and grind them in a ball mill until 325 mesh, mixed and stirred to obtain ingredients;

[0043] (2) Control the moisture of the ingredients at 5%, and use the air distribution system and pneumatic conveying system to transport it to the granulation tower; then use the multi-mouth water atomization system to atomize and humidify the ingredients to 8% for granulation, and finally After drying at 250°C, pellets were obtained.

[0044] (3) Put the pellets into the mold with an automatic distributing machine, first raise the temperature to 200°C at a rate of 15°C / min, and keep it warm for 1h; Heat up to 1180°C at a rate of 20°C / min, hold for 30 minutes, and sinter to shape;

[0045](4) First cool down to 700°C at a rate of 10°C / min, and hold for 2 hours; then cool down to 300°C at a rate of 15°C / min, and hold for 0.5h; finally coo...

Embodiment 3

[0047] (1) Take 95% molybdenum tailings, 3% sodium bicarbonate, 1% iron tailings, 0.8% boron nitride, 0.2% aluminum nitride, grind to 400 mesh in a ball mill, mix and stir , get ingredients;

[0048] (2) Control the moisture content of the ingredients within 2%, and use the air distribution system and pneumatic conveying system to transport it to the granulation tower; then use the multi-mouth water atomization system to atomize and humidify the ingredients to 15% for granulation, Finally, it is dried at 180°C to obtain pellets.

[0049] (3) Put the pellets into the mold with an automatic distributing machine, first raise the temperature to 400°C at a rate of 20°C / min, and keep warm for 0.5h; then raise the temperature to 700°C at a speed of 20°C / min, and keep warm for 1h; Heat up to 1200°C at a rate of 10°C / min, hold for 20 minutes, and sinter to shape;

[0050] (4) First cool down to 800°C at a rate of 5°C / min and hold for 1 hour; then cool down to 400°C at a rate of 10°C / ...

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Abstract

The invention belongs to the field of building materials and particularly relates to a molybdenum-tailings microcrystal foaming material and a preparation method thereof. The raw materials comprise molybdenum tailings, a foaming agent and an ingredient. The application amount of the molybdenum tailings is above 90%, and the utilization rate of the molybdenum tailings is greatly increased; the preparation method of the material is simple, and through simple pretreatment, granulation, distribution and sintering technologies, the raw materials can be processed into the finished products. The prepared molybdenum-tailings microcrystal foaming material can be applied to the building industry and has excellent performance such as low weight, high strength, low heat conduction coefficient and freeze thawing resistance, and the quality of the foaming material is greatly improved.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a molybdenum tailings microcrystalline foam material and a preparation method thereof. Background technique [0002] High-temperature foamed ceramics use clay, quartz, and feldspar as the main raw materials, add an appropriate amount of high-temperature foaming agent, and are ball-milled, dried, shaped, and fired at a suitable temperature. It is a thermal insulation porous ceramic material with high closed porosity. The raw materials can also be replaced by a proper amount of ceramic waste and construction waste, which can not only enhance the foaming effect but also realize the environmental protection utilization of the waste. At high temperature, the blowing agent will undergo pyrolysis or redox reaction to generate volatile gas, which will co-melt with the material matrix; at the same time, the solvent-based raw material will co-melt at high temperature to form a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/00C03C11/00C03C6/00
CPCC03C1/002C03C10/0063C03C11/007
Inventor 池宗鹏简军张文俭鲍艳华
Owner 河北恒钏建筑材料有限公司
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