Calcium zirconate and magnesia calcium zirconate brick prepared by calcium zirconate for cement kiln

A technology of magnesia calcium zirconium brick and calcium zirconate, which is applied in zirconium compounds, inorganic chemistry, chemical instruments and methods, etc., can solve problems such as poor performance of hanging kiln skin, improve thermal shock resistance, and solve hydration resistance. The effect of poor performance and good chemical stability

Inactive Publication Date: 2010-06-30
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 s

Method used

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  • Calcium zirconate and magnesia calcium zirconate brick prepared by calcium zirconate for cement kiln
  • Calcium zirconate and magnesia calcium zirconate brick prepared by calcium zirconate for cement kiln
  • Calcium zirconate and magnesia calcium zirconate brick prepared by calcium zirconate for cement kiln

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Experimental program
Comparison scheme
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] Typical values ​​for table calcium hydroxide

[0059] project

Ca(OH) 2

CaCO 3

MgO

SiO2+ acid insoluble matter

free moisture

content(%)

≥96

≤3

≤1

≤1...

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 calcium zirconate and a magnesia calcium zirconate brick prepared by the calcium zirconate for a cement kiln; in the calcium zirconate, desilicated zirconia and calcium hydroxide are adopted as raw materials and a sintering synthesis method is used to prepare; the calcium zirconate in the invention has remarkable de-hydration property, good chemical stability and good thermal-shock stability, and is very suitable for usage of refractory material for the cement kiln; 3.5-0mm of the calcium zirconate, 4-1mm of high-purity magnesia, 1-0mm of high-purity magnesia, 0.088-0mm of high-purity magnesia and spent pulping liquid are used as raw materials to prepare the magnesia calcium zirconate brick for the cement kiln; the magnesia calcium zirconate brick in the invention is a non-chrome environment-friendly product suitable for the cement kiln, has the advantages of good alkali resistance and good spalling resistance of a magnesia calcium brick, and is suitable for the using characteristics of the kiln which is used for processing garbage waste, compared with the pleonaste brick, the magnesia calcium zirconate brick has good advantages; in addition, the hydration problem of the magnesia calcium brick is overcome; thereby being an ideal refractory material for cement kiln clinkering zones.

Description

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. Background technique [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-produces calc...

Claims

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Application Information

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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志福温振兴付武斌
Owner GONGYI TONGDA ZHONGYUAN REFRACTORY TECH
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