Medium density forsterite sand and preparation method thereof

A technology of forsterite sand and medium density, which is applied in the field of refractory materials, can solve the problems of low heat insulation, poor high-temperature volume stability, and low strength, so as to improve long-term service performance, reduce production costs, and reduce geological disasters Effect

Active Publication Date: 2017-10-20
河南瑞泰耐火材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the cement industry, there are also composite bricks whose thermal insulation layer is heavy forsterite, whose thermal conductivity is 1.7w / mk. Heavy forsterite bricks have high strength and low heat insulation, while light forsterite bricks have insulation High heat but low strength
At present, although there is a synthesis of medium-density forsterite sand, its apparent porosity is high, there are many pores, and the volume stability at high temperature is not good, so it cannot be combined with dense materials with good high temperature resistance to make bricks.

Method used

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  • Medium density forsterite sand and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A medium-density forsterite sand, the raw material composition is: 85wt% of magnesite tailings with a particle size of less than 0.2mm, 15%wt of quartz powder with a particle size of less than 0.044mm, and additional magnesite with a particle size of 0.5-0.088mm Fine particles 40wt%, magnesium lignosulfonate binder 12wt%;

[0032] The chemical composition of the tailings is: MgO=40.6%, SiO 2 =17.6%, CaO=0.8%, Al 2 o 3 = 3.5%, Fe 2 o 3 =1.0%, KCl=0.6%, loss on ignition=35.9%;

[0033] The concentration of the magnesium lignosulfonate solution is 1.05g / cm 3 ;

[0034] The prepared forsterite sand has a bulk density of 2.11g / cm3 and an apparent porosity of 36%; after reburning at 1550°C for 3 hours, the change of the reburning line is -0.35%.

[0035] The preparation method of medium-density forsterite sand described in above-mentioned embodiment 1, comprises the steps:

[0036] (1) Weigh the magnesite tailings and lightly burn them at 1200° C. for 5 hours to obtai...

Embodiment 2

[0041] A medium-density forsterite sand, the raw materials mainly include: 88wt% of magnesite tailings with a particle size of less than 0.2mm, 12wt% of quartz powder with a particle size of Granules 30wt%, magnesium lignosulfonate binder 10wt%;

[0042] The chemical composition of the tailings is: MgO=40.5%, SiO 2 =15.8%, CaO=1.0%, Al 2 o 3 = 2.5%, Fe 2 o 3 =1.2%, KCl=0.4%, loss on ignition=38.6%;

[0043] The concentration of the magnesium lignosulfonate solution is 1.10g / cm 3 ;

[0044] The prepared forsterite sand: the bulk density is 2.19g / cm 3 , the apparent porosity is 33%; after reburning at 1550°C for 3 hours, the change of reburning line is -0.29%.

[0045] The preparation method of medium-density forsterite sand described in above-mentioned embodiment 2, comprises the steps:

[0046] (1) Weighing the magnesite tailings and lightly burning them at 1250° C. for 4 hours to obtain the lightly burned magnesite tailings;

[0047] (2) mixing the light-burned magnes...

Embodiment 3

[0051] A medium-density forsterite sand, the raw materials mainly include: 90wt% of magnesite tailings with a particle size of less than 0.2mm, 10wt% of quartz powder with a particle size of Granules 20wt%, magnesium lignosulfonate binder 8wt%;

[0052] The chemical composition of the tailings is: MgO=40.5%, SiO 2 =15.8%, CaO=1.0%, Al 2 o 3 = 2.5%, Fe 2 o 3 =1.2%, KCl=0.4%, loss on ignition=38.6%;

[0053] The concentration of the magnesium lignosulfonate solution is 1.15g / cm 3 ;

[0054] Prepared forsterite sand: the bulk density is 2.3g / cm 3 , the apparent porosity is 31%; after reburning at 1550°C for 3 hours, the change of reburning line is -0.31%.

[0055] One of the preparation method of medium-density forsterite sand described in above-mentioned embodiment 3, comprises the steps:

[0056] (1) Weighing the magnesite tailings and lightly burning them at 1280° C. for 3 hours to obtain the lightly burned magnesite tailings;

[0057] (2) mixing the light-burned mag...

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Abstract

The invention relates to a medium-density forsterite sand and a preparation method thereof. The technical solution is: take 85-93% wt of magnesite tailings and lightly burn them at 1200-1350°C for 0.5-5 hours, mix and grind them with 7-15% wt of quartz powder to obtain light-burned tailings with a particle size of less than 0.088mm Ore-quartz mixture; then add pore-forming agent accounting for 5-40%wt of the above-mentioned mixture in turn, and 3-12wt% binder, and carry out mixing, kneading, 110-150MPa pressure machine pressing, and drying treatment; after treatment, Calcined at 1650-1720°C for 4-9 hours to obtain high-temperature volume-stable medium-density forsterite. The invention uses light-burned tailings and quartz powder as raw materials to prepare medium-density forsterite with high fire resistance and good heat insulation performance, which has low thermal conductivity and high-temperature volume stability; Good performance in erosion and thermal shock, long service life, and good energy-saving effect.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a high-temperature volume stable medium-density forsterite sand and a preparation method thereof. technical background [0002] The cement industry is a well-known large energy consumer and also a large emitter of carbon dioxide. In the heat consumption of cement, the surface heat dissipation loss accounts for about 10%, reaching 70kcal / kg. Among them, the kiln body heat dissipation accounts for about 50% of the total heat dissipation, the kiln tail preheater and calciner account for about 35%, and the tertiary air duct and cooler account for about 15%. At present, my country is planning the second generation of new dry process cement production technology to reduce the heat consumption of clinker from 700 to 750kcal / kg to about 650kcal / kg, that is, to reduce the heat consumption by 50 to 100kcal / kg; Effectively reducing heat loss will make a great contr...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C04B35/66C04B38/00B09B3/00
Inventor刘锡俊李顺清徐如林刘昭徐琳琳王俊涛王杰曾翟耀杰胡世平
Owner河南瑞泰耐火材料科技有限公司