Hydrophobic calcium-based magnesium synthetic clinker

A calcium-based and magnesium-based technology, applied in the field of refractory materials, can solve the problems of poor waterproofing effect and easy damage, and achieve the effect of good waterproofing effect, reducing contact and solving hydrolysis problems.

Inactive Publication Date: 2010-06-02
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

[0007] However, these three methods are very easy to damage in actual operation. If the protective film, wax layer, oil layer or packaging layer is damaged, peeled off or opened, the waterproofing effect will not be good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The hydrophobic calcium-based magnesium synthetic clinker of the present invention,

[0023] The preparation process of the hydrophobic calcium-based magnesium synthetic clinker according to the present invention is carried out according to the following steps:

[0024] The ingredients by weight consist of:

[0025] Lightly burned dolomite 60% and lightly burned magnesia 40%;

[0026] Add 0.6% of ferric oxide, 0.6% of rare earth oxide and 6% of molding binder.

[0027] Rare earth oxide is CeO 2 、Pr 6 o 11 and Nd 2 o 3 A mixture of the three in equal proportions.

[0028] The forming binder is methyl cellulose.

[0029] It is pressed and formed with a 400-ton press at full capacity.

[0030] Then dry it at 100-110 temperature.

[0031] At the sintering temperature of 1630-1650°C, the two-step calcination method is used for calcination, and the holding time is 4 hours.

[0032] Experimental results:

[0033] (1) Chemical composition analysis (weight percentage...

Embodiment 2

[0040] The preparation process of the hydrophobic calcium-based magnesium synthetic clinker according to the present invention is carried out according to the following steps:

[0041] The ingredients by weight consist of:

[0042] Lightly burned dolomite 56% and lightly burned magnesia 44%;

[0043] Add 0.7% of ferric oxide, 0.7% of rare earth oxide and 7% of molding binder.

[0044] Rare earth oxide is CeO 2 、Pr 6 o 11 and Nd 2 o 3 Among the three, CeO 2 、Pr 6 o 11 0.2% each, Nd 2 o 3 0.3%.

[0045] The forming binder is methyl cellulose.

[0046] It is pressed and formed with a 400-ton press at full capacity.

[0047] Then dry it at 90-100°C.

[0048] At a firing temperature of 1610-1630°C, the usual two-step calcination method is used for calcination, and the holding time is 4 hours.

[0049] Experimental results:

[0050] (1) Test results of sintering performance and hydration resistance

[0051] Bulk density 3.5g / cm 3 , porosity 6.0%, hydration weight g...

Embodiment 3

[0054] The preparation process of the hydrophobic calcium-based magnesium synthetic clinker according to the present invention is carried out according to the following steps:

[0055] The ingredients by weight consist of:

[0056] Lightly burned dolomite 63% and lightly burned magnesia 37%;

[0057] Add 0.65% of ferric oxide, 0.8% of rare earth oxide and 6.5% of molding binder.

[0058] CeO in rare earth oxides 2 0.4%, Pr 6 o 11 0.1%, Nd 2 o 3 Three is 0.3%.

[0059] The forming binder is ethyl cellulose.

[0060] It is pressed and formed with a 400-ton press at full capacity.

[0061] Tumble dry at 105-115.

[0062]It is fired at a firing temperature of 1600-1650°C, and is calcined by the usual two-step calcination method, and the holding time is 5 hours.

[0063] Experimental results:

[0064] Test results of sintering performance and hydration resistance

[0065] Bulk density 3.6g / cm 3 , porosity 6.0%, hydration weight gain rate 0.26%.

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Abstract

The invention relates to a hydrophobic calcium-based magnesium synthetic clinker and belongs to the technical field of fire-retarding materials. The synthetic clinker is prepared by mixing lightly calcined dolomite, lightly calcined magnesium oxide and additives, rolling the mixture for forming, and drying and sintering the formed product, and comprises the following ingredients in percentage by weight: 55 to 65 percent of lightly calcined dolomite, 35 to 45 percent of lightly calcined magnesium oxide, 0.5 to 1 percent of ferricoxide, 0.5 to 1 percent of rare earth oxide and 6 to 7 percent of forming bonder. By adjusting the ingredients and a preparation process, the protection with high density and a covering layer is obtained; and the high volume density of the clinker blocks the permeation passage of water and vapor and the covering layer reduces the contact between lime and water, so the waterproof effect is good and the hydrolysis problem of the CaO is solved. The synthetic clinker has high thermal shock stability, corrosion resistance, erosion resistance and high temperature strength and is applicable to brick making by using various bonders. Particularly, the magnesia-calcium bricks produced by using the material can be used in burnt belts in cement kilns in place of magnesia-chrome brick stones. The synthetic clinker is an environmentally-friendly pollution-free refractory material.

Description

technical field [0001] The invention relates to a hydrophobic calcium-based magnesium synthetic clinker, which belongs to the technical field of refractory materials. Background technique [0002] The calcination of dolomite is divided into one-step calcination method and two-step calcination method. The calcination temperature of the one-step calcination method needs to be above 1800°C, and the two-step calcination method needs 1600-1650°C. However, the common defects of the dolomite sand produced by the two calcination methods are The hydrolysis of CaO cannot be solved. [0003] At present, the waterproofing methods adopted for dolomite clinker and its products in domestic and foreign markets include: [0004] (1) Cover the clinker particles with "coating method" to form a protective film. [0005] (2) Dip clinker particles or refractory products in oil or wax. [0006] (3) Vacuum packaging. [0007] However, these three methods are very easy to damage in actual operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 毕研虎毕思明孟庆云徐东升
Owner 淄博鑫耐达耐火材料股份有限公司
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