CN102850065A - Magnesium-iron-aluminum composite spinel brick for cement kiln high-temperature zone and manufacturing method thereof - Google Patents
Magnesium-iron-aluminum composite spinel brick for cement kiln high-temperature zone and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a magnesium-iron-aluminum composite spinel brick for a cement kiln high-temperature zone and a manufacturing method thereof. The magnesium-iron-aluminum composite spinel brick is prepared from the following main raw materials in percentage by mass: 30-40% of 1-5mm high-iron magnesite, 15-25% of 1-0.088mm high-purity magnesite, 30-35% of <0.088mm high-purity magnesite and 10-20% of 3-0mm electric melting magnesia alumina spinel, wherein the high-iron magnesite comprises at least 90 wt% of MgO, 4-8 wt% of Fe2O3 and less than 1 wt% of SiO2. The manufacturing method comprises the following steps: adding lignin liquor into mixed raw materials, mixing, pressing, drying, and firing at 1500-1650 DEG C to obtain the magnesium-iron-aluminum composite spinel brick. By combining the characteristics of the chrome-free brick, the magnesite-chrome bricks are substituted in different zones according to different operating conditions of different cement kilns, thereby enhancing advantages and avoiding disadvantages, maximally enhancing the cost performance of the refractory brick for the high-temperature zone, and implementing no chrome in the refractory brick for cement kilns.
Description
Technical field
The present invention relates to fire resisting material field, be specifically related to a kind of cement kiln high-temperature band magnesium iron aluminium composite spinelle brick and manufacture method thereof.According to the different running conditions of different cement kilns, in conjunction with the characteristics of chromium-free brick, subregion substitutes magnesia chrome brick, maximizes favourable factors and minimizes unfavourable ones, and improves as far as possible thermal zone cost performance with refractory brick, realizes the cement kiln Trend of Chrome-free of refractory brick.
Background technology
Thermal zone clinkering zone and the transitional zone of being divided into of dry-process cement rotary kiln specifically seen accompanying drawing 1.The kiln lining of cement kiln high-temperature band stands the most serious calorifics, mechanics, chemical depletion effect, and 60～70% of full kiln system refractory materials total flow occurs in thermal zone, is the harshest position of working conditions.Wherein clinkering zone should possess good extension kliner coating performance with refractory brick; Transitional zone should possess good thermal shock resistance energy with refractory brick.Because magnesia chrome brick has good extension kliner coating and thermal shock resistance energy concurrently, and low price, therefore be used widely at the cement kiln high-temperature band.Though magnesia chrome brick has preferably cost performance, magnesia chrome brick can produce carcinogenic sexavalent chrome salt compound (Cr after use
6+), can cause the pollution at local water source after the sexavalence chromic salts after kiln lining is removed in the residual brick of magnesium chromium is water-soluble, such as the mistake drink, shock, expiratory dyspnea can appear, even the phenomenon such as renal failure.
Among the China national ambient quality standard GB3838-88 Environmental Quality of Earth Surface Water is stipulated: tap water Cr
6+The unit of the highest permission content is 10
-8The order of magnitude (seeing Table 1).The Cr of the residual brick of magnesium chromium after cement kiln uses
6+Can up to 0.5%, if can not get suitable processing, will cause very serious pollution to environment.
Table 1 ground environment water is about Cr
6+Quality standard
For solving the chromium pollution problem of magnesia chrome brick used in cement kiln, refractory materials worker both domestic and external has carried out a large amount of research work for many years, develop multiple without chromium firebrick, such as Novel magnesium Alumina spinel brick, siliceous mullite brick etc., but over-all properties is not as good as magnesia chrome brick, will realize that therefore the cement kiln high-temperature band is with the Trend of Chrome-free of anti-material, must be according to the relative merits of different chromium-free bricks, maximize favourable factors and minimize unfavourable ones, minute section substitutes magnesia chrome brick, improves as far as possible the cost performance of chromium-free brick.
Summary of the invention
The purpose of this invention is to provide a kind of cement kiln high-temperature band magnesium iron aluminium composite spinelle brick, according to the characteristics of chromium-free brick, subregion substitutes magnesia chrome brick, maximizes favourable factors and minimizes unfavourable ones, and improves the cost performance of chromium-free brick, to realize the cement kiln Trend of Chrome-free of refractory brick.
The invention provides a kind of cement kiln high-temperature band magnesium iron aluminium composite spinelle brick, it is characterized in that take high ferro magnesia, electric melting magnesium aluminum spinel and highly-purity magnesite as main raw material, raw materials quality per-cent is: 5-1mm high ferro magnesia 30-40wt%, 1-0.088mm highly-purity magnesite particle 15-25wt%,＜0.088mm highly-purity magnesite fine powder 30-35wt%, 3-0mm electric melting magnesium aluminum spinel 10-20wt%, wherein, MgO 〉=90wt%, the Fe in the high ferro magnesia
2O
3Be 4-8wt%, SiO
2＜1wt%, the MgO 〉=96wt% in the highly-purity magnesite.Mixed raw material adds that the wedding agent lignosulfite mixes, suppress, drying and 1500～1650 ℃ make magnesium iron aluminium composite spinelle brick after burning till.
The present invention also provides a kind of method of producing above-mentioned magnesium iron aluminium composite spinelle brick, and its preparation process is as follows:
1. according to above-mentioned raw materials quality per-cent batching: the high ferro magnesia 30-40wt% of MgO 〉=90wt%, the highly-purity magnesite 45-60wt% of MgO 〉=96wt%, electric melting magnesium aluminum spinel 10-20wt%, wedding agent are lignosulfite;
2. mixing: mixing order is, first high ferro magnesia, highly-purity magnesite particle and electric melting magnesium aluminum spinel are poured into and be dry mixed 2～3 minutes in the mixer, then pour the wedding agent lignosulfite into, batch mixing is 2～3 minutes again, the highly-purity magnesite fine powder of general＜0.088mm is poured at last, and batch mixing is 10～12 minutes again;
3. moulding: with the wet feed ageing mixture compression moulding after 1～2 hour that mixes, moulding press tonnage 〉=400T;
4. dry: more than 16 hours, dry kiln enters car mouth temperature less than 70 ℃ in the dry kiln drying, and dry top temperature is controlled at 140～160 ℃;
5. burn till: burn till at hyperthermia tunnel Kiln, 1500～1650 ℃ of firing temperatures at high temperature are incubated 8～16 hours, and total firing time was at 100～120 hours.
Magnesium iron aluminium composite spinelle brick of the present invention contains magnesium-aluminium spinel ore deposit phase, and its thermal shock resistance can be better than magnesia chrome brick, contains simultaneously ferric oxide, and its extension kliner coating performance is suitable with magnesia chrome brick, can be used for clinkering zone; Simultaneously transition band of cement kiln can cooperate the bricks such as the Novel magnesium Alumina spinel brick that adopts market now to sell, siliceous mullite brick.
Table 2 magnesium iron of the present invention aluminium composite spinelle brick and magnesia chrome brick performance comparison *
Annotate---plus sige "+" is more, shows that this index is better.
Mainly take quality magnesia and magnesium-aluminium spinel as main raw material, through high-pressure molding, high temperature burns till to be produced Mg-Al spinel brick on the market.The Novel magnesium Alumina spinel brick is to keep on the stable basis of over-all properties, for using the position, outstanding some performance of improving.For example electric melting magnesium aluminum spinel is replaced the sintering magnesium-aluminium spinel to improve the resisting cement clinker aggressiveness of spinel brick.
Siliceous mullite brick is mainly take special grade bauxite and silicon carbide as main raw material, through high-pressure molding, high temperature burn till and make without chromium firebrick.The normal temperature of siliceous mullite brick and thermal structure intensity are high, and wear resistance is good, are useful in the transitional zone zone that wear resisting property is had relatively high expectations and use.
The present invention substitutes magnesia chrome brick at the cement kiln clinkering zone with magnesium iron aluminium composite spinelle brick, substitute magnesia chrome brick in transitional zone with Novel magnesium Alumina spinel brick or siliceous mullite brick, distribute rationally on the basis of improving as far as possible firebrick lining work-ing life, make the supporting cost performance of chromium-free brick near magnesia chrome brick, provide reliable basis for realizing cement kiln with the Trend of Chrome-free of anti-material.
Description of drawings
Fig. 1 is the thermal zone division figure of large-scale dry-process cement rotary kiln.Wherein 1 is clinkering zone, and 2 is transitional zone, and 3 is lower transitional zone.
Embodiment
Embodiment 1
Large-scale dry-process cement rotary kiln A, nsp kiln type, specification
Design output 5000T/D, fuel adopts bituminous coal, kiln operation factor＞95%.See Table 3 for configuring without chromium firebrick of kiln A.
Table 3 kiln A configures without chromium firebrick
| Use the position | Lower transitional zone | Clinkering zone | Upper transitional zone |
| The chromium-free brick kind | The Novel magnesium Alumina spinel brick | Magnesium iron aluminium composite spinelle brick | The Novel magnesium Alumina spinel brick |
Kiln A burning zone temperature is higher, therefore should take to hang kliner coating performance and all good magnesium iron aluminium composite spinelle bricks 1 of Erosion resistance energy, the concrete preparation technology of magnesium iron aluminium composite spinelle brick 1 is as follows:
(1) batching: 5-1mm high ferro magnesia 40%, 1-0.088mm highly-purity magnesite 15%,＜0.088mm highly-purity magnesite add-on 35%, 3-0mm electric melting magnesium aluminum spinel 10%.Wherein the MgO content in the high ferro magnesia is 92%, Fe
2O
3Be 5.50%, SiO
2Be 0.70%.
(2) mixing: batch mixing in the mixer in mixing workshop, mixing order is: pour the particulate material such as 5～1mm high ferro magnesia and 3-0mm electric melting magnesium aluminum spinel and 1～0.088mm highly-purity magnesite into mixer first and be dry mixed 3 minutes, then pour the wedding agent lignosulfite into, batch mixing is 3 minutes again, general＜0.088mm highly-purity magnesite fine powder is poured at last, and batch mixing got final product in 12 minutes again.
(3) moulding: the wet feed ageing mixture that mixes is compression moulding on 630T friction-type brick pressing machine after 2 hours, and the moulding sample is the cement kiln wedge brick, and the brick molded dimension is 74/69 * 198 * 220mm.
(4) drying: at dry kiln dry 16 hours, dry kiln entered car mouth temperature 60 C, and dry top temperature is controlled at about 150 ℃.
(5) burn till: burn till at 151 meters hyperthermia tunnel Kilns, 1650 ℃ of firing temperatures, insulation is 12 hours under 1400 ℃ of high temperature, and total firing time is about 120 hours.
The transitional zone kliner coating is not easy to hang steady, but because the kiln operation factor is high, the kiln condition is stable, be difficult for large ball in the kiln, transitional zone is low with the mechanical wear requirement of refractory brick, considers, adopt preferably Mg-Al spinel brick of thermal shock performance, its alumina content is generally about 10.5%.
Embodiment 2
Large-scale dry-process cement rotary kiln B, nsp kiln type, specification
Design output 2500T/D, fuel adopts bituminous coal, kiln operation factor＞90%.See Table 4 for configuring without chromium firebrick of kiln B.
Table 4 kiln B configures without chromium firebrick
| Use the position | Lower transitional zone | Clinkering zone | Upper transitional zone |
| The chromium-free brick kind | Siliceous mullite brick/Novel magnesium Alumina spinel brick | Magnesium iron aluminium composite spinelle brick | Novel magnesium Alumina spinel brick/siliceous mullite brick |
Kiln B clinkering zone takes Erosion resistance and to hang all good magnesium iron aluminium composite spinelle bricks 2 of kliner coating performance, and the concrete preparation technology of magnesium iron aluminium composite spinelle brick 2 is as follows:
(1) batching: 5-1mm high ferro magnesia add-on 35%, 1-0.088mm highly-purity magnesite add-on 15%,＜0.088mm highly-purity magnesite add-on 35%, 3-0mm electric melting magnesium aluminum spinel 15%.Wherein the MgO content in the high ferro magnesia is 91%, Fe
2O
3Content is 5.54%, SiO
2Content is 0.75%.
(2) mixing: batch mixing in the mixer in mixing workshop, mixing order is: pour the particulate material such as 5～1mm high ferro magnesia and 3-0mm electric melting magnesium aluminum spinel and 1～0.088mm highly-purity magnesite into mixer first and be dry mixed 3 minutes, then pour the wedding agent lignosulfite into, batch mixing is 3 minutes again, general＜0.088mm highly-purity magnesite fine powder is poured at last, and batch mixing got final product in 12 minutes again.
(3) moulding: the wet feed ageing mixture that mixes is compression moulding on 400T friction-type brick pressing machine after 1 hour, and the moulding sample is the cement kiln wedge brick, and the brick molded dimension is 74/69 * 198 * 200mm.
(4) drying: at dry kiln dry 16 hours, dry kiln entered car mouth temperature 60 C, and dry top temperature is controlled at about 150 ℃.
(5) burn till: burn till at 151 meters hyperthermia tunnel Kilns, 1620 ℃ of firing temperatures, insulation is 12 hours under 1600 ℃ of high temperature, and total firing time is about 120 hours.
The transitional zone kliner coating is not easy to hang steady, but because the kiln operation factor is low than kiln A, kiln condition stability decreases, easily play large ball in the kiln, transitional zone requires to improve with the mechanical wear of refractory brick, considers, the transitional zone end all adopts the good siliceous mullite brick of wear resistance up and down, transitional zone adopts the Novel magnesium Alumina spinel brick near the clinkering zone position up and down, and alumina content is at 5-8%, and the extension kliner coating performance of this brick and resisting cement clinker aggressiveness are all good than traditional Mg-Al spinel brick.
Cement kiln high-temperature strip length and transitional zone are different according to different kiln conditions from the length ratio of clinkering zone, therefore finely tune according to field condition without the concrete supporting need of chromium firebrick, but roughly auxiliary plan can be undertaken by above-described embodiment.
Claims (4)
1. a cement kiln high-temperature band is with magnesium iron aluminium composite spinelle brick, it is characterized in that: take high ferro magnesia, magnesium-aluminium spinel and highly-purity magnesite as main raw material, raw materials quality per-cent is: 5-1mm high ferro magnesia 30-40wt%, 1-0.088mm highly-purity magnesite particle 15-25wt%,＜0.088mm highly-purity magnesite fine powder 30-35wt%, 3-0mm electric melting magnesium aluminum spinel 10-20wt%; In the high ferro magnesia, MgO 〉=90wt%, Fe
2O
3Be 4-8wt%, SiO
2＜1wt%; MgO 〉=96wt% in the highly-purity magnesite; Add after above-mentioned raw materials mixed that spent pulping liquor mixes, suppress, drying and 1500～1650 ℃ make magnesium iron aluminium composite spinelle brick after burning till.
2. magnesium iron aluminium composite spinelle brick as claimed in claim 1 is characterized in that, contains magnesium-aluminium spinel ore deposit phase in this magnesium iron aluminium composite spinelle brick, its thermal shock resistance is better than magnesia chrome brick, contain again simultaneously ferric oxide, it is suitable with magnesia chrome brick that it hangs kliner coating, is adapted at clinkering zone and uses.
3. magnesium iron aluminium composite spinelle brick as claimed in claim 1 or 2 is characterized in that, this magnesium iron aluminium composite spinelle brick is used for the cement kiln clinkering zone, and transition band of cement kiln adopts Novel magnesium Alumina spinel brick and the siliceous mullite brick that now sell in market simultaneously.
4. such as the manufacture method of the described magnesium iron of claim 1-3 aluminium composite spinelle brick, it is characterized in that, preparation process is as follows:
1. according to raw materials quality per-cent batching claimed in claim 1: the high ferro magnesia 30-40wt% of MgO 〉=90wt%,
The highly-purity magnesite 45-60wt% of MgO 〉=96wt%, electric melting magnesium aluminum spinel 10-20wt%, wedding agent are lignosulfite;
2. mixing: mixing order is, first high ferro magnesia, highly-purity magnesite particle and electric melting magnesium aluminum spinel are poured into and be dry mixed 2～3 minutes in the mixer, then pour the wedding agent lignosulfite into, batch mixing is 2～3 minutes again, the highly-purity magnesite fine powder of general＜0.088mm is poured at last, and batch mixing is 10～12 minutes again;
3. moulding: with the wet feed ageing mixture compression moulding after 1～2 hour that mixes, moulding press tonnage 〉=400T;
4. dry: more than 16 hours, dry kiln enters car mouth temperature less than 70 ℃ in the dry kiln drying, and dry top temperature is controlled at 140～160 ℃;
5. burn till: burn till at hyperthermia tunnel Kiln, 1500～1650 ℃ of firing temperatures at high temperature are incubated 8～16 hours, and total firing time was at 100～120 hours.
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| CN103058688A (en) * | 2013-01-25 | 2013-04-24 | 苏州罗卡节能科技有限公司 | Middle-density magnesium-iron-aluminum spinel brick for revolving kiln and preparation method thereof |
| CN104961485A (en) * | 2015-06-26 | 2015-10-07 | 海城市中兴高档镁质砖有限公司 | Magnesium spinel refractory material high in thermal shock resistance and manufacturing method thereof |
| CN106220201A (en) * | 2016-07-30 | 2016-12-14 | 安徽海螺暹罗耐火材料有限公司 | Cement kiln clinkering zone alundum is combined Chrome-free Mg-Al spinel brick and preparation method |
| CN106518047A (en) * | 2016-11-11 | 2017-03-22 | 辽宁科技大学 | Preparation method of magnesia hercynite |
| CN107915474A (en) * | 2018-01-12 | 2018-04-17 | 安徽海螺暹罗耐火材料有限公司 | A kind of cement kiln clinkering zone mafic spinel brick and preparation method thereof |
| CN110066182A (en) * | 2019-05-28 | 2019-07-30 | 江苏诺明高温材料股份有限公司 | Utilize the method for pyrite cinder preparation magnesium-ferrum-aluminum composite material |
| CN110981462A (en) * | 2019-12-30 | 2020-04-10 | 武汉科技大学 | Porous periclase-magnesium-iron-aluminum composite spinel ceramic material and preparation method thereof |
| CN111170724A (en) * | 2019-12-30 | 2020-05-19 | 武汉科技大学 | Lightweight periclase-magnesium-iron-aluminum composite spinel refractory material and preparation method thereof |
| CN113061045A (en) * | 2021-04-21 | 2021-07-02 | 营口丰华耐火材料有限公司 | Magnesium-iron-zinc-aluminum composite spinel refractory brick for cement kiln burning zone and preparation method thereof |
| CN113929438A (en) * | 2021-10-22 | 2022-01-14 | 河南瑞泰耐火材料科技有限公司 | Preparation method of refractory material for cement kiln burning zone |
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| CN115417658A (en) * | 2022-08-17 | 2022-12-02 | 辽宁中镁新材料有限公司 | Novel magnesium aluminate spinel brick for cement kiln burning zone and production method thereof |
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| CN102344292A (en) * | 2011-06-22 | 2012-02-08 | 通达耐火技术股份有限公司 | Magnesium-ferrum-aluminum composite spinel brick for large-scale cement kiln and preparation method thereof |
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| CN102344292A (en) * | 2011-06-22 | 2012-02-08 | 通达耐火技术股份有限公司 | Magnesium-ferrum-aluminum composite spinel brick for large-scale cement kiln and preparation method thereof |
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| CN103058688A (en) * | 2013-01-25 | 2013-04-24 | 苏州罗卡节能科技有限公司 | Middle-density magnesium-iron-aluminum spinel brick for revolving kiln and preparation method thereof |
| CN104961485A (en) * | 2015-06-26 | 2015-10-07 | 海城市中兴高档镁质砖有限公司 | Magnesium spinel refractory material high in thermal shock resistance and manufacturing method thereof |
| CN104961485B (en) * | 2015-06-26 | 2017-03-22 | 海城市中兴高档镁质砖有限公司 | Magnesium spinel refractory material high in thermal shock resistance and manufacturing method thereof |
| CN106220201A (en) * | 2016-07-30 | 2016-12-14 | 安徽海螺暹罗耐火材料有限公司 | Cement kiln clinkering zone alundum is combined Chrome-free Mg-Al spinel brick and preparation method |
| CN106518047A (en) * | 2016-11-11 | 2017-03-22 | 辽宁科技大学 | Preparation method of magnesia hercynite |
| CN106518047B (en) * | 2016-11-11 | 2019-04-19 | 辽宁科技大学 | A kind of preparation method of ferro-magnesium-aluminum spinelle |
| CN107915474A (en) * | 2018-01-12 | 2018-04-17 | 安徽海螺暹罗耐火材料有限公司 | A kind of cement kiln clinkering zone mafic spinel brick and preparation method thereof |
| CN110066182A (en) * | 2019-05-28 | 2019-07-30 | 江苏诺明高温材料股份有限公司 | Utilize the method for pyrite cinder preparation magnesium-ferrum-aluminum composite material |
| CN110981462A (en) * | 2019-12-30 | 2020-04-10 | 武汉科技大学 | Porous periclase-magnesium-iron-aluminum composite spinel ceramic material and preparation method thereof |
| CN111170724A (en) * | 2019-12-30 | 2020-05-19 | 武汉科技大学 | Lightweight periclase-magnesium-iron-aluminum composite spinel refractory material and preparation method thereof |
| CN111170724B (en) * | 2019-12-30 | 2022-04-12 | 武汉科技大学 | Lightweight periclase-magnesium-iron-aluminum composite spinel refractory material and preparation method thereof |
| CN113061045A (en) * | 2021-04-21 | 2021-07-02 | 营口丰华耐火材料有限公司 | Magnesium-iron-zinc-aluminum composite spinel refractory brick for cement kiln burning zone and preparation method thereof |
| CN113929438A (en) * | 2021-10-22 | 2022-01-14 | 河南瑞泰耐火材料科技有限公司 | Preparation method of refractory material for cement kiln burning zone |
| CN114455940A (en) * | 2022-03-06 | 2022-05-10 | 河南工业大学 | Magnesium-manganese-iron-aluminum composite spinel refractory material for cement kiln burning zone and preparation method thereof |
| CN115417658A (en) * | 2022-08-17 | 2022-12-02 | 辽宁中镁新材料有限公司 | Novel magnesium aluminate spinel brick for cement kiln burning zone and production method thereof |
| CN115611614A (en) * | 2022-09-06 | 2023-01-17 | 安徽海螺暹罗耐火材料有限公司 | Low-heat-conductivity magnesia-hercynite brick for cement kiln and preparation method thereof |
| CN115650747A (en) * | 2022-11-16 | 2023-01-31 | 鞍山钢铁冶金炉材科技有限公司 | Magnesia-hercynite ladle wall gunning mix and preparation method thereof |
| CN115650747B (en) * | 2022-11-16 | 2023-12-15 | 鞍山钢铁冶金炉材科技有限公司 | Magnesia-hercynite steel ladle wall gunning material and preparation method thereof |
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Application publication date: 20130102 |