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Nickel and iron slag-based forsterite lightweight heat insulation brick and making method thereof

A forsterite, light-weight heat-insulating technology, applied in the field of light-weight heat-insulating brick refractories, can solve the problems of occupying land, polluting the environment, etc., achieving low production cost, high microporosity, promoting solid-phase reaction and brick The effect of bulk sintering

Active Publication Date: 2016-01-27
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current treatment methods of ferronickel slag are stockpiling and landfilling, which not only occupy land and pollute the environment, but also pose severe challenges to the sustainable development of ferronickel smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A light insulation tile of magnesium -based magnesium -iron slag and its preparation method.With 65 ~ 68WT%nickel iron residue, 17 ~ 20WT%light magnesium oxide fine powder, 5 ~ 8WT%magnesium carbonate fine powder, and 8 ~ 10WT%silicon microfan powder, plus 0.5 ~ 1.0WT, the raw material is 0.5 ~ 1.0WT%TIO 2 Micro powder, 5 ~ 8WT%charcoal black, and 3 ~ 5WT%of the pulp waste liquid, mix well, suppress the molding; keep 4 ~ 6h under the conditions of 500 ~ 550 ° C, and then burn it under the condition of 1300 ~ 1350 ° C. warm2 ~ 3h, the magnesium olives based on nickel iron residue are light heating tiles.

[0023] Magnesium -based magnesium olives prepared by nickel iron residue prepared in this embodiment 1: Lotus softening point is 1330 ~ 1350 ° C; pressure resistance is 5.5 ~ 6.0MPa; volume density is 1.55 ~ 1.60g / cm / cm 3 ; The pores of less than 20 μm are 86 ~ 88%; the heat conduction coefficient at 1000 ° C is 0.605 ~ 0.635W / (m.k).

Embodiment 2

[0025] A light insulation tile of magnesium -based magnesium -iron slag and its preparation method.With 67 ~ 70WT%nickel iron residue, 15 ~ 18WT%light magnesium oxide fine powder, 6 ~ 9WT%of magnesium carbonate fine powder, and 7 ~ 9WT%silicon microfan powder, plus 0.9 ~ 1.4WT, the raw material is 0.9 ~ 1.4WT%TIO 2 Micro powder, 7 ~ 10WT%charcoal black and 4 ~ 6WT%of the pulp waste liquid, mixed uniformly, suppressing molding; heat preservation of 5 ~ 7h under the conditions of 540 ~ 590 ° C, and then burned under the conditions of 1340 ~ 1390 ° C, heat thermal insulation, heat thermal insulation3 ~ 4h, the magnesium olives based on nickel iron residue are light heating tiles.

[0026] Magnesium -based magnesium olives prepared by nickel iron residue prepared in this Example 2: The soft heating brick of the lotus weight is 1340 ~ 1360 ° C; the pressure resistance is 5.9 ~ 6.4MPa; the volume density is 1.60 ~ 1.65g / cm / cm 3 ; The pores of less than 20 μm are 84 ~ 86%; the heat condu...

Embodiment 3

[0028] A light insulation tile of magnesium -based magnesium -iron slag and its preparation method.With 69 ~ 72WT%nickel iron residue, 13 ~ 16WT%light magnesium oxide fine powder, 7 ~ 10WT%magnesium carbonate fine powder, and 6 ~ 8WT%silicon microfan powder, plus the raw material 1.3 ~ 1.8WT%TIO 2 Micro powder, 9 ~ 12WT%charcoal black and 5 ~ 7WT%of the pulp waste liquid, mix well, suppress the molding, heat up 6 ~ 8h under the conditions of 580 ~ 630 ° C, and then burn it under the condition of 1380 ~ 1430 ° C, heat thermal insulation4 ~ 5h, the magnesium -mourarian olivine based on nickel iron residue is light heating tiles.

[0029] Magnestes based on nickel iron residue based on nickel iron residue 3 embodiments 3: The softening point of the lotus is 1350 ~ 1370 ° C; the pressure resistance is 6.3 ~ 6.8MPa; the volume density is 1.65 ~ 1.70g / cm / cm 3 ; The pores of less than 20 μm are 82 ~ 84%; the heat conduction coefficient at 1000 ° C is 0.625 ~ 0.655W / (m.k).

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Abstract

The invention relates to a making method of a nickel and iron slag-based forsterite lightweight heat insulation brick. A technical scheme adopted in the invention is characterized in that the method comprises the following steps: adopting 65-75wt% of nickel and iron slag, 10-20wt% of light calcined magnesia fine powder, 5-15wt% of magnesium carbonate fine powder and 5-10wt% of silicon micro-powder as raw materials, adding an additive accounting for 0.5-2.0wt% of the weight of the raw materials, carbon black accounting for 5-15wt% of the weight of the raw materials and a paper pulp waste liquid accounting for 3-9wt% of the weight of the raw materials, uniformly mixing, and carrying out compaction molding; and carrying out heat insulation at 500-700DEG C for 4-8h, sintering at 1300-1550DEG C, and carrying out heat insulation for 2-6h in order to obtain the nickel and iron slag-based forsterite lightweight heat insulation brick. The making method has the advantages of high resource recovery rate, environmental protection and low production cost; and the nickel and iron slag-based forsterite lightweight heat insulation brick made in the invention has the advantages of good volume stability, high pressure strength, low volume density, high micro-porosity and low heat conduction coefficient.

Description

Technical field [0001] The invention is the technology field of light insulation brick refractory materials.Specifically involved a light heating tile of magnesium -based magnesium -based magnesium and iron residue. Background technique [0002] Magnesium olive (mg 2 SIO 4 ) It is a weak alkaline refractory material, which has the characteristics of high strength, high melting point, good chemistry and mineral stability, low thermal conductivity (1 / 3 to 1 / 4 of pure magnesium oxide), and as well as most alkaline and most alkaline natureThe refractory material has good compatibility.At present, magnesium olive materials are mainly synthesized by magnesium and silicon raw materials at high temperatures, or through the solitary -gel method.As the light heating tiles of magnesium olives are widely used in high -temperature thermal workers, magnesium refractory raw materials such as magnesium magnesium olives preparing magnesium olives will become increasingly tense. [0003] In recent...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 徐义彪李亚伟桑绍柏王同生潘家和张志韧
Owner WUHAN UNIV OF SCI & TECH
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