CN104557077A - Modified high-alumina brick for cold ends of calcining zone and transitional zone of cement kiln and method for preparing high-alumina brick - Google Patents
Modified high-alumina brick for cold ends of calcining zone and transitional zone of cement kiln and method for preparing high-alumina brick Download PDFInfo
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Abstract
The invention relates to a modified high-alumina brick for cold ends of a calcining zone and a transitional zone of a cement kiln and a preparation method of a high-alumina brick. The modified high-alumina brick comprises the following materials: 25-35 percent of tertiary alumina particles with granularity of 5-3mm, 15-25 percent of tertiary alumina particles with granularity of 3-1mm, 10-1 percent of tertiary alumina with granularity of 1-0mm, 20-35 percent of tertiary alumina fine powder with granularity of smaller than 0.088mm, 5-10 percent of primary alumina fine powder with granularity of smaller than 0.088mm, 3-5 percent of andalusite fine powder with granularity of smaller than 0.088mm, 0-6 percent of silicon carbide fine powder with granularity of smaller than 0.088%, 0-4 percent of soft clay with granularity of smaller than 0.088mm, and a binding agent which accounts for 3-7 percent of the gross weight of the above raw materials. The preparation method comprises the following steps: mixing and rolling the raw materials according to proportion, then ageing for 16-24h, pressing for shaping, introducing the shaped material into a kiln to be dried for more than 24h at the temperature of 120-140 DEG C, calcining at the firing temperature of 1300-1400 DEG C, and carrying out heat preservation for 6-8h to obtain the high-alumina brick. The modified high-alumina brick is reasonable in alkali resistance and thermal shock resistance and better in energy-saving and heat-insulating effects.
Description
Technical field
The present invention relates to fire resisting material field, be specifically related to a kind of cement kiln and divide and ungird and transitional zone cold junction modification high alumina brick and preparation method thereof.
Background technology
China has abundant bauxite mine resource, at the forefront in the world.The fire resistive material product adopting alumine to prepare is applied already on cement kiln.But new dry-process cement rotary kiln is obvious by alkali inrichment, common high alumina brick due to aluminium content higher, alkali resistance does not often reach requirement, and its thermal shock resistance yet Shortcomings.
The siliceous mullite brick generally used at present often adopts one-level and even special grade bauxite as raw material in a large number, and adds the SiC of mass ratio 10-25%.SiC adds the alkaline resistance properties and thermal shock resistance that can improve goods, but its shortcoming also clearly.The SiC of high additive is not only expensive, and improves the sintering temperature of goods, and then it is many to cause SiC scaling loss in sintering process; In addition SiC add the thermal conductivity that improve material, although improve the heat-shock resistance of goods, higher thermal conductivity can cause more heat leakage in cement actual production.These shortcomings obviously fully utilize with china natural resources and the policy of low-carbon environment-friendly is conflicted mutually.
Summary of the invention
The object of the invention is to study a kind of cement kiln divide and ungird and transitional zone cold junction modification high alumina brick and preparation method thereof, adopt low-grade bauxite to make as main raw material, have rational alkali resistance and heat-shock resistance, production cost is lower.The present invention adopts three grades of alumina of relative low price as main raw material, a small amount of one-level alumina of admixture, and adds andaluzite fine powder and carbide fine powder carries out modification, adopts the mode brickmaking that phosphoric acid salt combines.Relatively low aluminium content and the SiC taking the circumstances into consideration to add make the alkali resistance of goods get a promotion.Andaluzite fine powder and SiC add the thermal shock resistance and high-temperature behavior that can improve goods, and the mode that phosphoric acid salt combines further improves intensity and the thermal shock resistance of goods.Meanwhile, due to the reduction with aluminium content in goods that adds of phosphoric acid, its sintering temperature also reduces relatively, and the scaling loss of SiC reduces, thus reduces production cost.Lower SiC volume makes the thermal conductivity [≤1.2W/ (mK)] of goods, lower than the thermal conductivity of the siliceous mullite brick [≤2.0W/ (mK)] generally used at present, in use plays better energy-saving heat preserving effect.
By above technique means, make the performance of goods can meet cement kiln to divide and ungird, while the service requirements of transitional zone cold junction, fully utilized low grade material resource, and decreased production energy consumption, improve heat-insulating property, meet the policy of china natural resources comprehensive utilization and low-carbon environment-friendly.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
Adopt following raw material weight proportioning,
The additional bonding agent accounting for above-mentioned raw materials gross weight 3-7%.Bonding agent is that one or more cooperations in spent pulping liquor, phosphate aqueous solution, aluminium dihydrogen phosphate aqueous solution form.Volume (or weight) proportioning of described bonding agent spent pulping liquor, phosphate aqueous solution, aluminium dihydrogen phosphate aqueous solution is 1-2: 0-1: 0-1.The proportion of the spent pulping liquor adopted is 1.2-1.5g/cm
3; The proportion of described phosphate aqueous solution is 1.2-1.4g/cm
3, amount to phosphoric acid concentration 40%-60%; The P/Al mol ratio of described aluminium dihydrogen phosphate is 3-4, proportion 1.3-1.5.After mixing, the proportion of bonding agent is 1.3-1.6g/cm
3.
Preparation technology of the present invention is: above-mentioned materials proportionally carries out mixed grind, first adds particulate material, then adds fine powder, finally adds bonding agent.Ageing mixture 16-24h after mixed grind, be pressed into shaping after enter dry kiln drying, drying temperature 120-140 DEG C, time of drying > 24h.Rear feeding is that fuel high-temperature tunnel furnace sintering soak 6-8h makes with Sweet natural gas, firing temperature 1300-1400 DEG C.
Cement kiln divide ungird, the chemical constitution of transitional zone cold junction modification high alumina brick is: Al
2o
355-60%; SiO
2>=35%, SiC0-6%, all the other are impurity.
Embodiment
Embodiment 1
Cement kiln divide ungird, transitional zone cold junction modification high alumina brick, by weight percentage, comprise following raw materials:
Additional phosphoric acid (the proportion 1.4g/cm accounting for above-mentioned raw materials gross weight 5%
3) as bonding agent.
Above-mentioned materials proportionally carries out mixed grind, first adds particulate material, then adds fine powder, finally adds bonding agent.Ageing mixture 4h after mixed grind, be pressed into shaping after enter dry kiln drying, drying temperature 120 DEG C, time of drying 24h.Rear feeding take Sweet natural gas as fuel high-temperature tunnel furnace sintering soak 6h, firing temperature 1300 DEG C.I.e. obtained goods, goods thermal conductivity 1.0W/ (mK).
Embodiment 2
Cement kiln divide ungird, transitional zone cold junction modification high alumina brick, by weight percentage, comprise following raw materials:
Three grades of alumina particles 35% of granularity 5-3mm
Three grades of alumina particles 15% of granularity 3-1mm.
Claims (3)
1. cement kiln divides and ungirds and a transitional zone cold junction modification high alumina brick, it is characterized in that: the formula of the weight percent of described high alumina brick is:
The additional bonding agent accounting for above-mentioned raw materials gross weight 3-7%
Described bonding agent is that one or more cooperations in spent pulping liquor, phosphate aqueous solution, aluminium dihydrogen phosphate aqueous solution form; The weight proportion of described bonding agent spent pulping liquor, phosphate aqueous solution, aluminium dihydrogen phosphate aqueous solution is 1-2: 0-1: 0-1; The proportion of the spent pulping liquor adopted is 1.2-1.5g/cm
3, the proportion of described phosphate aqueous solution is 1.2-1.4g/cm
3, amount to phosphoric acid concentration 40%-60%, the P/Al mol ratio of described aluminium dihydrogen phosphate is 3-4, proportion 1.3-1.5; After mixing, the proportion of bonding agent is 1.3-1.6g/cm
3.
2. a high alumina brick described in claim 1, is characterized in that: the chemical constitution of described high alumina brick is: Al
2o
355-60%; SiO
2>=35%, SiCO-6%, all the other are impurity.
3. prepare the technique of high alumina brick described in claim 1 and 2 for one kind, it is characterized in that: described technique is for carry out mixed grind according to proportioning raw materials, first add particulate material, then add fine powder, finally add bonding agent, ageing mixture 16-24h after mixed grind, enter dry kiln drying after compression moulding, drying temperature 120-140 DEG C, time of drying > 24h, rear feeding is that the hyperthermia tunnel Kiln sintering soak 6-8h of fuel makes with Sweet natural gas, firing temperature 1300-1400 DEG C.
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| CN201410758947.9A CN104557077A (en) | 2014-12-05 | 2014-12-05 | Modified high-alumina brick for cold ends of calcining zone and transitional zone of cement kiln and method for preparing high-alumina brick |
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| CN201410758947.9A CN104557077A (en) | 2014-12-05 | 2014-12-05 | Modified high-alumina brick for cold ends of calcining zone and transitional zone of cement kiln and method for preparing high-alumina brick |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105237018A (en) * | 2015-11-19 | 2016-01-13 | 长兴兴鹰新型耐火建材有限公司 | Abrasion-resistant anti-erosion pouring material for cement kiln tertiary air duct |
| CN105254319A (en) * | 2015-11-19 | 2016-01-20 | 长兴兴鹰新型耐火建材有限公司 | Casting material for prefabricated brick for feeding chamber and preparation method of casting material |
| CN105272319A (en) * | 2015-11-19 | 2016-01-27 | 长兴兴鹰新型耐火建材有限公司 | Cement kiln tertiary air duct prefabricated member |
| CN105461330A (en) * | 2015-11-19 | 2016-04-06 | 长兴兴鹰新型耐火建材有限公司 | An anti-crust wear-resistant prefabricated brick used for a feeding chamber of a cement kiln |
| CN106187238A (en) * | 2016-07-21 | 2016-12-07 | 济源市金峰耐火材料有限公司 | Bauxite composite refractory brick and its preparation method and application |
| CN107117952A (en) * | 2017-06-30 | 2017-09-01 | 湖南湘钢瑞泰科技有限公司 | A kind of refractory brick and preparation method |
| CN111620710A (en) * | 2020-06-29 | 2020-09-04 | 江苏君耀耐磨耐火材料有限公司 | Composite high-alumina silicon carbide brick for cooperatively treating cement kiln predecomposition zone |
| CN115583838A (en) * | 2022-10-25 | 2023-01-10 | 昆山思创耐火材料有限公司 | Refractory brick for high-temperature annealing furnace and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105237018A (en) * | 2015-11-19 | 2016-01-13 | 长兴兴鹰新型耐火建材有限公司 | Abrasion-resistant anti-erosion pouring material for cement kiln tertiary air duct |
| CN105254319A (en) * | 2015-11-19 | 2016-01-20 | 长兴兴鹰新型耐火建材有限公司 | Casting material for prefabricated brick for feeding chamber and preparation method of casting material |
| CN105272319A (en) * | 2015-11-19 | 2016-01-27 | 长兴兴鹰新型耐火建材有限公司 | Cement kiln tertiary air duct prefabricated member |
| CN105461330A (en) * | 2015-11-19 | 2016-04-06 | 长兴兴鹰新型耐火建材有限公司 | An anti-crust wear-resistant prefabricated brick used for a feeding chamber of a cement kiln |
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| CN107117952A (en) * | 2017-06-30 | 2017-09-01 | 湖南湘钢瑞泰科技有限公司 | A kind of refractory brick and preparation method |
| CN111620710A (en) * | 2020-06-29 | 2020-09-04 | 江苏君耀耐磨耐火材料有限公司 | Composite high-alumina silicon carbide brick for cooperatively treating cement kiln predecomposition zone |
| CN115583838A (en) * | 2022-10-25 | 2023-01-10 | 昆山思创耐火材料有限公司 | Refractory brick for high-temperature annealing furnace and manufacturing method thereof |
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