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Calcium zirconate and magnesia calcium zirconium bricks for cement kilns made from calcium zirconate

A technology of magnesia-calcium-zirconium bricks and calcium zirconate, which is applied in zirconium compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of poor hanging kiln skin performance, etc., and achieve improved thermal shock resistance and good alkali erosion resistance Sex, solve the effect of poor hydration resistance

Inactive Publication Date: 2012-02-08
GONGYI TONGDA ZHONGYUAN REFRACTORY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Magnesia-aluminum spinel bricks are widely used in cement kilns at home and abroad, but compared with the first three products, this product has poor kiln skin hanging performance, so at present, this product is mostly used in cement kilns at home and abroad. Used on the transition zone at both ends of the firing zone

Method used

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  • Calcium zirconate and magnesia calcium zirconium bricks for cement kilns made from calcium zirconate
  • Calcium zirconate and magnesia calcium zirconium bricks for cement kilns made from calcium zirconate
  • Calcium zirconate and magnesia calcium zirconium bricks for cement kilns made from calcium zirconate

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Experimental program
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Effect test

Embodiment 1

[0055] Synthetic specific requirements of various raw materials used for the product calcium zirconate of the present invention: the raw material desiliconized zirconium used is ZrO 2 ≥90%, ZrO 2 ≥95%, ZrO 2 ≥98% or ZrO 2 ≥99% four grades, four grades of desiliconized zirconium are suitable for synthesizing calcium zirconate of different grades (the typical values ​​of various grades of desiliconized zirconium are shown in Table 1), Ca(OH) in the raw calcium hydroxide 2 ≥96% (see Table 2 for the typical value of raw material calcium hydroxide); the pulp waste liquid is a binder, the mass percentage of lignin in the pulp waste liquid is 20-30%, and the density is 1.08-1.20g / cm 3 .

[0056] Table 1 Typical values ​​of four grades of desiliconized zirconium

[0057]

[0058] Table 2 Typical values ​​of calcium hydroxide

[0059] project

Ca(OH) 2

CaCO 3

MgO

SiO2+ acid insoluble matter

free moisture

Content (%)

≥96

≤3

...

Embodiment 2

[0073] Embodiment two: basically the same as embodiment one, the difference is:

[0074] Product calcium zirconate of the present invention is prepared by the following method, differs from embodiment one in that:

[0075] Step a: The raw material used is desiliconized zirconium 60% (ZrO 2 ≥98%) and calcium hydroxide 40%;

[0076] Step b: the addition of pulp waste liquid accounts for 3% of the total amount of raw materials;

[0077] Step c: use a friction brick press with a pressure of 400T to press the blank into blanks, and dry the blanks at 120°C;

[0078] Step d: The firing temperature is 1650° C., and the temperature is kept for 10 hours when the firing temperature is reached.

[0079] The magnesia-calcium-zirconium brick for cement kiln prepared by using the above-mentioned calcium zirconate: the raw material ratio of the magnesia-calcium-zirconium brick contains 40% of high-purity magnesia with a particle size of 4-1mm, 18% of high-purity magnesia with a particle si...

Embodiment 3

[0083] Embodiment three: basically the same as embodiment one, the difference is:

[0084] Product calcium zirconate of the present invention is prepared by the following method, differs from embodiment one in that:

[0085] Step a: The raw material used is desiliconized zirconium 65% (ZrO 2 ≥99%) and calcium hydroxide 35%;

[0086] Step b: the amount of pulp waste liquid added accounts for 5% of the total amount of raw materials;

[0087] Step c: use a friction brick press with a pressure of 300T to press the blank into blanks, and dry the blanks at 160°C;

[0088] Step d: The firing temperature is 1680° C., and the temperature is kept for 8 hours when the firing temperature is reached.

[0089] The magnesia-calcium-zirconium brick for cement kiln prepared by using the above-mentioned calcium zirconate: the raw material ratio of the magnesia-calcium-zirconium brick contains 36% of high-purity magnesia with a particle size of 4-1mm, 19% of high-purity magnesia with a partic...

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Abstract

The invention discloses a calcium zirconate and a magnesia-calcium-zirconium brick for cement kiln prepared by using the calcium zirconate. The calcium zirconate product of the invention is prepared from desiliconized zirconium and calcium hydroxide as raw materials by a sintering synthesis method. The calcium zirconate product of the invention has remarkable hydration resistance, better chemical stability and better thermal shock stability, and is very suitable for the use of refractory materials for cement kilns. The product of the present invention is 3.5-0mm calcium zirconate, 4-1mm high-purity magnesia, 1-0mm high-purity magnesia, 0.088-0mm high-purity magnesia and pulp waste liquid as raw materials to prepare the inventive product magnesia-calcium-zirconium brick for cement kiln. The product of the present invention, magnesia-calcium-zirconium brick, is a chromium-free environmental protection product suitable for cement kilns, which does not contain chrome and pollution. The use characteristics of waste kilns have greater advantages over magnesia-iron spinel bricks, and at the same time overcome the hydration problem of magnesia-calcium bricks. It is an ideal refractory material for cement kiln firing zone.

Description

1. Technical field: [0001] The invention relates to a refractory material and a preparation method thereof, in particular to calcium zirconate and magnesium-calcium-zirconium bricks for cement kilns prepared by using calcium zirconate. 2. Background technology: [0002] At present, there are two main methods of preparing refractory calcium zirconate, namely electrofusion synthesis and sintering synthesis. Calcium zirconate prepared by electrofusion synthesis is not suitable for the production of magnesia-calcium-zirconium bricks for cement kilns, and The process is relatively complicated and the production cost is relatively high; the calcium zirconate produced by the sintering synthesis method researched by our company (Gongyi Tongda Zhongyuan Refractory Technology Co., Ltd.) is very suitable for the production of magnesia-calcium-zirconium bricks for cement kilns. Up to now, this sintering method has been adopted in China Our company is the only manufacturer that mass-prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/00C04B35/66
Inventor 冯运生李献明李勇康华荣高长贺周新功周亚辉周伟李智福温振兴付武斌
Owner GONGYI TONGDA ZHONGYUAN REFRACTORY TECH
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