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Magnesium aluminate spinel-calcium dialuminate light thermal insulation material based on phosphate tailings and preparation method of magnesium aluminate spinel-calcium dialuminate light thermal insulation material

A technology of magnesium aluminum spinel and calcium dialuminate, which is applied in the field of magnesium aluminum spinel-calcium dialuminate lightweight heat insulation materials and its preparation, can solve the problem of low compressive strength and occupation of light heat insulation materials Resource production cost, high thermal conductivity and other issues, to achieve the effect of strong alkali corrosion resistance, low production cost, low thermal conductivity

Pending Publication Date: 2022-04-22
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, although there is a patented technology for tailings to be used to prepare lightweight heat-insulating refractory materials, the process is complicated, resources are occupied and production costs are high, and the light-weight heat-insulating materials prepared have low compressive strength and high thermal conductivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A magnesium aluminum spinel-calcium dialuminate light-weight thermal insulation material based on phosphorous tailings and a preparation method thereof. The preparation method described in this embodiment is:

[0034]Step 1. First, use 70-75wt% of phosphorus tailings and 25-30wt% of alumina powder as raw materials, mix them evenly, and then add 20-30wt% of the pore-forming agent and 4-11wt% of water, Stir to obtain the mixture.

[0035] Step 2: trap the mixture for 12-15 hours, shape it, dry it naturally, and dry it at 90-95° C. for 42-48 hours to obtain a blank.

[0036] Step 3. The billet is first heated from room temperature to 390-400°C at a rate of 4-4.5°C / min, then raised to 670-690°C at a rate of 2-2.5°C / min, and then heated at a rate of 10-10.5°C / min. Raise the temperature to 1300-1400°C at a rate of 1 min, hold the temperature for 2-3 hours, and cool down with the furnace to prepare the magnesium-aluminum spinel-calcium dialuminate light-weight thermal insula...

Embodiment 2

[0043] A magnesium aluminum spinel-calcium dialuminate light-weight thermal insulation material based on phosphorous tailings and a preparation method thereof. The preparation method described in this embodiment is:

[0044] Step 1. First, use 75-80wt% phosphorous tailings and 20-25wt% alumina powder as raw materials, mix evenly, and then add 10-20wt% pore-forming agent and 11-18wt% water, Stir to obtain the mixture.

[0045] Step 2: trap the mixture for 15-18 hours, shape it, dry it naturally, and dry it at 95-100° C. for 36-42 hours to obtain a billet.

[0046] Step 3. The billet is first heated from room temperature to 380-390°C at a rate of 4.5-5°C / min, then raised to 690-710°C at a rate of 2.5-3°C / min, and then heated at a rate of 10.5-11°C / min. Raise the temperature to 1200-1300°C at a rate of 1 min, hold the temperature for 3-4 hours, and cool down with the furnace to prepare a magnesium-aluminum spinel-calcium dialuminate light-weight thermal insulation material base...

Embodiment 3

[0053] A magnesium aluminum spinel-calcium dialuminate light-weight thermal insulation material based on phosphorous tailings and a preparation method thereof. The preparation method described in this embodiment is:

[0054] Step 1. First, use 80-85wt% phosphorous tailings and 15-20wt% alumina powder as raw materials; mix evenly, then add pore-forming agent accounting for 1-10wt% of the raw materials and 18-25wt% water, Stir to obtain the mixture.

[0055] Step 2: trap the mixture for 18-21 hours, shape it, dry it naturally, and dry it at 100-105° C. for 30-36 hours to obtain a billet.

[0056] Step 3. The billet is first heated from room temperature to 370-380°C at a rate of 5-5.5°C / min, then raised to 710-730°C at a rate of 3-3.5°C / min, and then heated at a rate of 11-11.5°C / min. Raise the temperature to 1100-1200°C at a rate of 1 min, keep the temperature for 4-6 hours, and cool down with the furnace to prepare the magnesium-aluminum spinel-calcium dialuminate light-weigh...

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Abstract

The invention relates to a magnesium aluminate spinel-calcium dialuminate lightweight thermal insulation material based on phosphate tailings and a preparation method thereof. According to the technical scheme, 70-90 wt% of phosphate tailings and 10-30 wt% of aluminum oxide powder serve as raw materials and are mixed to be uniform, 0-30 wt% of a pore forming agent and 4-32 wt% of water are added, stirring, ageing, forming, natural drying and drying are conducted, and a blank is obtained; the blank is heated to 360-400 DEG C from the room temperature at the rate of 4-6 DEG C / min, then heated to 670-750 DEG C at the rate of 2-4 DEG C / min, then heated to 1000-1400 DEG C at the rate of 10-12 DEG C / min, subjected to heat preservation for 2-8 h and cooled along with a furnace, and the magnesium aluminate spinel-calcium dialuminate light heat insulation material based on the phosphate tailings is prepared. The magnesium aluminate spinel-calcium dialuminate lightweight thermal insulation material has the characteristics of high phosphate tailing reutilization rate, high additional value, low production cost and simple process, and the prepared magnesium aluminate spinel-calcium dialuminate lightweight thermal insulation material based on phosphate tailings has the advantages of high compression strength, high porosity, low volume density, low heat conductivity coefficient and strong alkali erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of phosphorus tailing resource reuse. In particular, it relates to a magnesium aluminum spinel-calcium dialuminate light heat insulation material based on phosphorus tailings and a preparation method thereof. Background technique [0002] Phosphorus tailings are low-grade phosphate rocks enriched with P 2 o 5 subsequent solid waste. The current stockpiles are increasing year by year, which not only occupies a large amount of land, but also brings serious environmental problems such as vegetation destruction and water pollution, and even poses a safety risk of dam failure. The main mineral composition of phosphorous tailings is dolomite (CaMg(CO 3 ) 2 ), mainly composed of CaO, MgO and SiO 2 and other non-metallic oxides, also including about 10wt% volatile substances (P 2 o 5 , SO 3 ) and about 30wt% organic matter, the reuse of phosphorus tailings has attracted the attention of technicians. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/66C04B35/44C04B35/443C04B35/622
CPCC04B38/068C04B38/0675C04B35/66C04B35/443C04B35/44C04B35/62204C04B2235/96C04B2235/77C04B2235/9607C04B2235/3217
Inventor 叶义成黄洋胡南燕姚囝罗斌玉柯丽华张光权王其虎
Owner WUHAN UNIV OF SCI & TECH
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