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Hydrophobic magnesium/calcium synthetic clinker and preparation technique thereof

A preparation process, magnesia-calcium technology, applied in the field of refractory materials, can solve the problems that magnesia-calcium bricks cannot be fully utilized, magnesia-calcium bricks are not fully utilized, magnesia-calcium bricks are easy to hydrate, etc., and achieve good thermal shock stability , little change in reburning line and low porosity

Inactive Publication Date: 2011-09-07
淄博鑫耐达耐火材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the specific use of magnesia-calcium bricks in China, due to some objective reasons, magnesia-calcium bricks cannot be fully utilized, such as frequent unplanned shutdowns, resulting in underutilization of magnesia-calcium bricks. Easily hydrates when heated, making it impossible to reuse
The existing technology only covers the raw materials by coating the granules, or uses oil-soaked wax protection or vacuum packaging to prevent the hydration of the raw materials, but does not fundamentally solve the hydration problem of the raw materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Raw materials are weighed according to the ratio: 25% of light-burned magnesia powder, 60% of light-burned dolomite powder, 7% of high-purity lime, 8% of additives, and the additives are made of CeO 2 , fused silica and Fe 2 o 3 Composition, the mass ratio of the three is 1:5:1, the raw materials except high-purity lime are respectively ground by Raymond mill, so that the particle size of each raw material is less than 320 mesh, and the ground raw materials are mixed by planetary roller mixer Evenly, when high-purity lime is digested to make lime milk, the amount of water added accounts for 28% of the total mass of the ground raw materials, and all raw materials are put into a vacuum mud mixer for mixing and extruding to produce a billet, and the vacuum degree is kept at 0.08 Mpa, the drying temperature is 110°C, fired in a shaft kiln, the firing temperature is 1660°C, and kept for 6 hours. Test the synthetic clinker, the test results of sintering performance and hydr...

Embodiment 2

[0030] Raw materials are weighed according to the proportion: 32% of light-burned magnesia powder, 57% of light-burned dolomite powder, 5% of high-purity lime, 6% of additives, and the additives are made of Nd 2 o 3 , fused silica and Fe 2 o 3 Composition, the mass ratio of the three is 1:5:1, the raw materials except high-purity lime are respectively ground by Raymond mill, so that the particle size of each raw material is less than 320 mesh, and the ground raw materials are mixed by planetary roller mixer Evenly, when high-purity lime is digested to make lime milk, the amount of water added accounts for 30% of the total mass of the ground raw materials, and all raw materials are put into a vacuum mud mixer for mixing and extruding to produce a billet, and the vacuum degree is kept at 0.05 Mpa, the drying temperature is 110°C, fired in a shaft kiln, the firing temperature is 1630°C, and the heat preservation is 7 hours. The synthetic clinker was tested, the sintering perfo...

Embodiment 3

[0032] Raw materials are weighed according to the ratio: 35% of light-burned magnesia powder, 55% of light-burned dolomite powder, 6% of high-purity lime, 4% of additives, and the additives are made of Nd 2 o 3 , fused silica and TiO 2 Composition, the mass ratio of the three is 1:5:1, the raw materials except high-purity lime are respectively ground by Raymond mill, so that the particle size of each raw material is less than 320 mesh, and the ground raw materials are mixed by planetary roller mixer Evenly, when digesting high-purity lime to make lime milk, the amount of water added accounts for 29% of the total mass of the ground raw materials, and all raw materials are put into a vacuum mud mixer for mixing and extruding to produce a billet, and the vacuum degree is kept at 0.03 Mpa, the drying temperature is 120°C, fired in a shaft kiln, the firing temperature is 1650°C, and the heat preservation is 8 hours. The synthetic clinker was tested, the sintering performance and ...

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PUM

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Abstract

The invention belongs to the technical field of refractory materials, and particularly relates to a hydrophobic magnesium / calcium synthetic clinker and a preparation technique thereof. The hydrophobic magnesium / calcium synthetic clinker is prepared from the following raw materials in percentage by weight: 25-35% of light-burned magnesia powder, 50-60% of light-burned dolomite powder, 3-10% of high-purity lime and 3-8% of additive. The additive is a combination of rare-earth oxide and fused quartz, or a combination of rare-earth oxide, fused quartz, metallic oxide and non-metallic oxide. The preparation technique comprises the following steps: respectively grinding the light-burned magnesia powder, light-burned dolomite powder and additive, evenly stirring, adding a forming binder, mixing in vacuum, ejecting, molding, carrying out oven drying, and burning to obtain the hydrophobic magnesium / calcium synthetic clinker. The hydrophobic magnesium / calcium synthetic clinker has the advantages of high volume density, low porosity, high thermal shock stability, no environment pollution and the like, and can not be hydrated.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a hydrophobic magnesium-calcium synthetic clinker and a preparation process thereof. Background technique [0002] Now many large-scale cement rotary kilns and stainless steel refining furnaces in my country are lined with fired magnesia-chrome bricks or magnesia-calcium bricks. Some developed countries in foreign countries are banned because of the carcinogenic hexavalent chromium in magnesia-chrome bricks, and magnesia-calcium bricks are used instead of magnesia-chrome bricks. However, during the specific use of magnesia-calcium bricks in China, due to some objective reasons, magnesia-calcium bricks cannot be fully utilized, such as frequent unplanned shutdowns, resulting in underutilization of magnesia-calcium bricks. It is easy to hydrate when heated, so that it cannot be used again. The existing technology only covers the raw materials by coating t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 毕研虎毕思明徐东升王长军胡立明
Owner 淄博鑫耐达耐火材料股份有限公司
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