CN101450867A - Sintering composite alkaline brick for dry lime rotary kiln and method for producing the same - Google Patents

Sintering composite alkaline brick for dry lime rotary kiln and method for producing the same Download PDF

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Publication number
CN101450867A
CN101450867A CNA2007101719816A CN200710171981A CN101450867A CN 101450867 A CN101450867 A CN 101450867A CN A2007101719816 A CNA2007101719816 A CN A2007101719816A CN 200710171981 A CN200710171981 A CN 200710171981A CN 101450867 A CN101450867 A CN 101450867A
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CN
China
Prior art keywords
rotary kiln
brick
magnesia
percent
dry lime
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2007101719816A
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Chinese (zh)
Inventor
宋飞
金从进
陈金荣
张斌
李泽亚
励军
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Shanghai Baosteel Industry Inspection Corp
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Shanghai Baosteel Industry Inspection Corp
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Application filed by Shanghai Baosteel Industry Inspection Corp filed Critical Shanghai Baosteel Industry Inspection Corp
Priority to CNA2007101719816A priority Critical patent/CN101450867A/en
Publication of CN101450867A publication Critical patent/CN101450867A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a dry lime rotary kiln, in particular to a composite brick for the dry lime rotary kiln. The sintered composite basic brick for the dry lime rotary kiln comprises a working layer and a heat-insulating layer, wherein the working layer mainly comprises the following compositions by weight percentage: 69 to 88 percent of magnesite with a magnesia content of more than 96 percent, and 10 to 28 percent of magnalium spinel with a magnesia content of more than 20 percent; and the heat-insulating layer mainly comprises the following compositions by weight percentage: 48 to 77 percent of magnesite with a magnesia content of more than 96 percent, and 20 to 49 percent of forsterite with a magnesia content of more than 20 percent. The sintered composite basic brick for the dry lime rotary kiln has the properties of high temperature resistance, alkali resistance, abrasion resistance and so on, can be used for calcining zones and transition zones of the lime kiln and a cement kiln, can realize the aims of energy conservation and consumption reduction, and has long service life.

Description

Sintering composite alkaline brick for dry lime rotary kiln and manufacture method thereof
Technical field
The present invention relates to dry lime rotary kiln, relate in particular to a kind of dry lime rotary kiln composite brick.
Background technology
Large-scale limestone kiln, cement kiln clinkering zone use magnesia-spinel brick and magnesia chrome brick usually, because of its thermal conductivity height, often cause the cylindrical shell at this position overheated, cylindrical shell the is heat gain excessively damage probability of mechanical means, quickened barrel distortion, and barrel distortion has quickened the physical disturbance of liner, consequently falls brick, stops kiln, influences the operation factor of rotary kiln.
Chinese patent CN96226710.4 has proposed the high magnesia spinel composite brick of a kind of low-carbon (LC), this utility model relates to a kind of high magnesia spinel composite brick of low-carbon (LC) that is applicable to the cement rotary kiln clinkering zone, it comprises the main body that is made of refractory materials and assembles steel plate on it, wherein main body is mixed with graphite, and the main body non-operative end is provided with the heat insulation composite bed of high porosity.This composite brick does not need high temperature to burn till, and manufacture method is simple.But this kind is not burnt composite brick and is had unstable properties, simultaneously because main body contains graphite and working conditions is a high temperature oxidation atmosphere, is difficult to work-ing life guarantee.
Chen Feng etc. have reported " development and the exploitation of refractory heat-insulating alkalescence composite brick " literary composition in the first phase in 1997 " silicate circular " p62~65, having developed a kind of magnesia chrome brick is working lining, with forsterite, magnesia and chrome ore be main raw material thermofin burn till composite brick.The dry-process cement rotary kiln transitional zone that is used for this composite brick has reduced by 100 ℃ of barrel temperatures, but this brick that contains chromium with after have the sexavalent chrome of contaminate environment, belong to and eliminate kind.
Chinese invention patent refractory heat-insulating composite brick CN98110051.1 has proposed a kind of non-sintered high aluminium composite brick and preparation method thereof, and this composite brick is a laminate structure, is composited by working lining and thermofin.This composite brick has good high temperature resistant, acid and alkali-resistance, performance such as wear-resistant, can realize saving energy and reduce the cost.But clinkering zone, transitional zone that this composite brick is not suitable at lime rotary kiln are used.
Summary of the invention
The present invention is intended to address the deficiencies of the prior art, and a kind of sintering composite alkaline brick for dry lime rotary kiln and manufacture method thereof are provided.The composite alkaline brick that burns till that provides of the present invention has splendid performance such as high temperature resistant, alkaline-resisting, wear-resistant.It can be used for the clinkering zone and the transitional zone of limestone kiln, cement kiln, can realize saving energy and reduce the cost, and the life-span is long.
The present invention is achieved in that
A kind of sintering composite alkaline brick for dry lime rotary kiln comprises working lining and thermofin, and described working lining mainly comprises the component wt% of following content:
Content of magnesia is greater than 96% magnesia: 68~88%; With
Content of magnesia is greater than 20% magnesium-aluminium spinel: 10~28%;
Also have in addition,
1~2% magnesium chloride; With
1~2% spent pulping liquor;
Described thermofin mainly comprises the component wt% of following content:
Content of magnesia is greater than 96% magnesia: 48~77%; With
Content of magnesia is greater than 20% magnesium olive sand: 20~49%;
Also have in addition,
1% magnesium chloride; With
2% spent pulping liquor.
The preparation method of described sintering composite alkaline brick for dry lime rotary kiln, it comprises the following steps:
According to described proportioning working lining is prepared burden and the batch mixing step;
According to described proportioning thermofin is prepared burden and the batch mixing step;
Working lining and thermofin co-molded are integral step; With
All-in-one-piece working lining and thermofin sintering step will be molded.
Described sintering temperature is 1550~1650 ℃.
It is the magnesia spinel working lining of main raw material that the present invention adopts magnesia, magnesium-aluminium spinel, has splendid performance such as high temperature resistant, alkaline-resisting, wear-resistant; Adopt the thermofin of white olivine to have low thermal conductivity and high intensity.This composite alkaline brick can effectively reduce limestone kiln, cement kiln barrel temperature, can realize saving energy and reduce the cost, and the life-span is quite long.
Compare alkaline composite brick longer service life of the present invention with the high magnesia spinel composite brick of low-carbon (LC).Compare with the refractory heat-insulating alkalescence composite brick that contains chromium, the present invention does not contain chromium, environmentally safe.Compare with non-sintered high aluminium composite brick, the present invention can be used for thermal zone (clinkering zone and the transitional zone) of limestone kiln, cement kiln, and working conditions is harsher, and the life-span is longer.
Embodiment
A kind of sintering composite alkaline brick for dry lime rotary kiln comprises working lining and thermofin, and described working lining mainly comprises the component wt% of following content:
Content of magnesia is greater than 96% magnesia: 68~88%;
Content of magnesia is greater than 20% magnesium-aluminium spinel: 10~28%;
Also include in addition,
1~2% magnesium chloride; With
1~2% spent pulping liquor;
Described thermofin mainly comprises the component wt% of following content:
Content of magnesia is greater than 96% magnesia: 48~77%; With
Content of magnesia is greater than 20% magnesium olive sand: 20~49%;
Also include in addition,
1% magnesium chloride; With
2% spent pulping liquor.
The preparation method of described sintering composite alkaline brick for dry lime rotary kiln, it comprises the following steps:
According to described proportioning working lining is prepared burden and the batch mixing step;
According to described proportioning thermofin is prepared burden and the batch mixing step;
Working lining and thermofin co-molded are integral step; With
To be molded all-in-one-piece working lining and thermofin in 1550~1650 ℃ of sintering steps.
The Specifeca tion speeification of following specific embodiments of the invention and each embodiment, see table 1 and table 2 for details: in the table: apparent porosity is measured according to GB/T2997; Compressive strength is measured according to GB/T5072; 350 ℃ of thermal conductivitys are measured according to GB/T17106-1997; Heat-shock resistance is measured according to YB/T376.1.
Table 1: composition of working lining (weight percentage) and characteristic
Composition of table 2 thermofin (weight percentage) and characteristic
Limestone kiln, cement kiln barrel temperature height are problems of puzzlement producer always.The effective means that the invention provides composite alkaline brick is the solution limestone kiln, the cement kiln barrel temperature is high.

Claims (5)

1. a sintering composite alkaline brick for dry lime rotary kiln comprises that working lining and thermofin is characterized in that, described working lining mainly comprises the component wt% of following content:
Content of magnesia is greater than 96% magnesia: 68~88%; With
Content of magnesia is greater than 20% magnesium-aluminium spinel: 10~28%;
Described thermofin mainly comprises the component wt% of following content:
Content of magnesia is greater than 96% magnesia: 48~77%; With
Content of magnesia is greater than 20% magnesium olive sand: 20~49%.
2. sintering composite alkaline brick for dry lime rotary kiln according to claim 1 is characterized in that, described working lining includes in addition:
1~2% magnesium chloride; With
1~2% spent pulping liquor.
3. sintering composite alkaline brick for dry lime rotary kiln according to claim 1 is characterized in that described thermofin includes in addition,
1% magnesium chloride; With
2% spent pulping liquor.
4. according to the preparation method of claim 1,2 or 3 described sintering composite alkaline brick for dry lime rotary kiln, it is characterized in that it comprises the following steps:
According to described proportioning working lining is prepared burden and the batch mixing step;
According to described proportioning thermofin is prepared burden and the batch mixing step;
Working lining and thermofin co-molded are integral step; With
All-in-one-piece working lining and thermofin sintering step will be molded.
5. the preparation method of sintering composite alkaline brick for dry lime rotary kiln according to claim 4 is characterized in that, described sintering temperature is 1550~1650 ℃.
CNA2007101719816A 2007-12-07 2007-12-07 Sintering composite alkaline brick for dry lime rotary kiln and method for producing the same Pending CN101450867A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007101719816A CN101450867A (en) 2007-12-07 2007-12-07 Sintering composite alkaline brick for dry lime rotary kiln and method for producing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007101719816A CN101450867A (en) 2007-12-07 2007-12-07 Sintering composite alkaline brick for dry lime rotary kiln and method for producing the same

Publications (1)

Publication Number Publication Date
CN101450867A true CN101450867A (en) 2009-06-10

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102353253A (en) * 2011-08-17 2012-02-15 通达耐火技术股份有限公司 Rotary cement kiln
CN101671185B (en) * 2009-09-14 2012-07-04 营口辰兴耐火材料有限公司 Method for producing forsterite sand-containing gunning material for steel ladles
CN102589290A (en) * 2012-03-15 2012-07-18 浙江大学苏州工业技术研究院 Forsterite four-layered composite brick and manufacturing method thereof
CN102853653A (en) * 2011-06-30 2013-01-02 上海宝钢工业检测公司 Stable kiln liner of asphalt rotary kiln
CN105565794A (en) * 2015-12-16 2016-05-11 淄博市鲁中耐火材料有限公司 Preparation method of low-heat-conductivity magnesia-alumina spinel brick
CN109160812A (en) * 2018-08-27 2019-01-08 海城利尔麦格西塔材料有限公司 The low thermally conductive Mg-Al spinel brick of cement kiln
CN109930832A (en) * 2017-12-15 2019-06-25 马锐 The technology on the cement foamed wall roof of pouring type closed pore

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101671185B (en) * 2009-09-14 2012-07-04 营口辰兴耐火材料有限公司 Method for producing forsterite sand-containing gunning material for steel ladles
CN102853653A (en) * 2011-06-30 2013-01-02 上海宝钢工业检测公司 Stable kiln liner of asphalt rotary kiln
CN102353253A (en) * 2011-08-17 2012-02-15 通达耐火技术股份有限公司 Rotary cement kiln
CN102589290A (en) * 2012-03-15 2012-07-18 浙江大学苏州工业技术研究院 Forsterite four-layered composite brick and manufacturing method thereof
CN102589290B (en) * 2012-03-15 2014-04-09 浙江大学苏州工业技术研究院 Forsterite four-layered composite brick and manufacturing method thereof
CN105565794A (en) * 2015-12-16 2016-05-11 淄博市鲁中耐火材料有限公司 Preparation method of low-heat-conductivity magnesia-alumina spinel brick
CN105565794B (en) * 2015-12-16 2019-04-23 淄博市鲁中耐火材料有限公司 A kind of preparation method of low thermally conductive Mg-Al spinel brick
US11299433B2 (en) 2015-12-16 2022-04-12 Zibo City Luzhong Refractories Co., Ltd. Manufacturing method of magnesium-aluminium spinel brick and magnesium-aluminium spinel brick manufactured by the method
CN109930832A (en) * 2017-12-15 2019-06-25 马锐 The technology on the cement foamed wall roof of pouring type closed pore
CN109160812A (en) * 2018-08-27 2019-01-08 海城利尔麦格西塔材料有限公司 The low thermally conductive Mg-Al spinel brick of cement kiln

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Open date: 20090610