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Fire clay for building blast furnace
CN1232806A
China
- Other languages
Chinese - Inventor
王资江 彭达岩 高立春 王秉军 卞彦奎 王素珍 - Current Assignee
- Central Iron and Steel Research Institute
Worldwide applications
1999
CN
Application CN 99107771 events
1999-05-28
1999-10-27
2002-06-26
Application granted
2002-06-26
2019-05-28
Anticipated expiration
Status
Expired - Fee Related
Description
translated from
The invention belongs to the field of blast furnace manufacturing. Is especially suitable for the blast furnace lining adopting the same refractory mortar to build different refractory bricks.
As is known, the refractory lining of an iron-making blast furnace is built by cold walls and refractory bricks, and the working environment and the burning loss mechanism of different parts from the throat, the shaft and the bottom of the blast furnace are different. In order to balance the damage speed of the furnace lining of each part and lead the furnace lining to be damaged evenly, thereby achieving the purpose of prolonging the service life of the furnace lining, the solution is to build refractory bricks of different materials (namely the comprehensive building of the blast furnace) at different parts in the blast furnace, such as clay bricks, high-alumina bricks, aluminum carbon bricks, silicon carbide bricks, semi-graphitized silicon carbide bricks, carbon bricks and the like. With the continuous improvement of the blast furnace preparation technology and the continuous strengthening of the production process, the working conditions of the refractory lining in the blast furnace become more severe. Therefore, the combination conditions of refractory bricks made of different materials required by different furnace building technologies are more strict.
In the prior art, the fire clay for building the refractory bricks of the blast furnace is made of fire-resistant raw materials with chemical components basically consistent with those of the built refractory bricks, namely, each fire clay can only be used for building the refractory bricks with the same material. For example, high-alumina refractory mortar for building high-alumina bricks and silicon carbide refractory mortar for building silicon carbide bricks, and so on, if the high-alumina bricks and the silicon carbide bricks are built together, the high-alumina refractory mortar or the silicon carbide refractory mortar cannotmeet the requirements because the bonding strength is too low (less than 1MPa), so that a great variety of refractory mortar is required to be prepared for building a blast furnace, which brings a lot of troubles to construction, particularly at junctions of different brick types, because the performance of the refractory mortar cannot meet the requirements of different brick types at the same time, brick joints of the parts often become weak links and are eroded too fast, and the service life of the furnace lining is directly influenced.
The invention aims to provide the refractory mortar for the comprehensive masonry of the blast furnace, which has wide application range, good comprehensive performance and good construction characteristics at normal temperature.
It can be seen from the above objects that the present invention provides a composite fire clay for use in constructing blast furnaces, which not only has the prior art of sufficient refractoriness and refractoriness under load, good thermal expansion coefficient and corrosion resistance, but also has the prior art of sufficiently strong chemical affinity and bonding strength with various bricks made of different materials, good construction performance and other application performances.
The refractory mortar for comprehensive masonry of blast furnace is characterized by that its composition is formed from (wt%) 72-76% of aggregate and 24-28% of binder. And additional curing accelerator 0.1-3 wt% of aggregate, wherein the chemical components in the aggregate A and the aggregate are Al2O360-80％,SiO215-20%, SiC 0-8%, C2-5%, Si 1-3%, and other non-removable components 2-4%; B. in addition, the chemical components of the adhesive are (wt%) 10-20% of asphalt, 10-70% of phenolic resin, 10-40% of furan resin and 0-30% of tar. C. 0.1 to 3 percent of aluminate cement, 0 to 3 percent of alkali metal oxide, 0 to 3 percent of alkali metal hydroxide,
the refractory mortar for blast furnace comprehensive masonry has other characteristics that in the aggregate components, other unremovable components refer to elements which are not easy to remove, such as calcium oxide, titanium oxide and the like, in the aggregate. Further characterized in that the curing accelerator is a combination of aluminate cement and either an alkali metal oxide or an alkali metal hydroxide.
The aggregate component of the refractory mortar for blast furnace comprehensive masonry of the present invention contains Al2O360-80％,SiO215-20 percent, and aims to ensure that the main components of the refractory mortar are similar to those of refractory bricks made of various materials, so that the refractory mortar has better chemical affinity with the refractory bricks and basically similar properties such as refractoriness, refractoriness under load, thermal expansion coefficient, corrosion resistance and the like. The component of the invention is specially selected from Al with higher chemical activity2O3And SiO2For the purpose of Al at high temperature2O3SiO (silicon on SiO) is used2After reaction, a stable high-temperature phase- -mullite (or mullite) is generated ) And the generation of the mullite is beneficial to the improvement of the high-temperature bonding strength of the refractory mortar. In addition, the aggregate also contains 1 to 3 percent of Si, 2 to 5 percent of C and 0 to 8 percent of SiC, which is intended to mentionSince the chemical affinity between the high refractory mortar and the refractory bricks containing SiC is poor and sintering is difficult, if SiC is not contained in the refractory bricks to be constructed, SiC is not added tothe refractory mortar. The SiC content in the refractory mortar should be limited to 8% or less because the bond strength of the refractory mortar is significantly affected when the SiC content exceeds 8%. The presence of C increases the thermal conductivity and corrosion resistance of the refractory mortar, the effect is too low when the content is less than 2 percent, the bonding strength of the refractory mortar is reduced when the content is more than 5 percent, and the addition of Si is mainly used for utilizing the reaction of Si in aggregate or C in a binder at high temperature to generate SiC (C ) Thereby improving the high-temperature bonding strength of the refractory mortar.
In the refractory mortar of the invention, the binder is composed of a plurality of organic matter components, and the purpose is that the refractory mortar does not generate a large amount of water vapor in the baking process to influence the production operation of a blast furnace and damage a furnace lining, and meanwhile, in the binder, the combination of a plurality of organic matters has higher bonding strength at normal temperature and high temperature than the single use of one organic matter.
In the composition of the fire clay of the present invention, the sum of two components of aluminate cement and either one of alkali metal oxide or alkali metal hydroxide contained in the curing accelerator should be 0.1 to 3% of the total amount of the aggregate. The method aims to utilize a small amount of water contained in the aluminate cement refractory mortar and the binder to perform hydration reaction, and utilize alkali metal oxide or alkali metal hydroxide to neutralize residual acid in the binder, so as to promote the curing of the refractory mortar, avoid the slurry in brick joints from flowing, ensure that the slurry in the brick joints is full, and prevent refractory bricks from shifting and the like.
The preparation method of the refractory mortar for blast furnace comprehensive masonry is similar to the prior art, and comprises the steps of firstly preparing various component raw materials with the particle size of less than 0.5mm according to the requirements of designers, then uniformly mixing the raw materials in a sand mixer, and bagging the mixture for later use. The binder is prepared by mixing the raw material solvents according to the proportion of the designer, putting the mixture into a container, uniformly mixing and stirring the mixture, and putting the mixture into a barrel for later use. The use of the refractory mortar is that the prepared aggregate and the adhesive are added into a slurry stirrer according to the proportion required by a designer before site construction, and the refractory mortar can be used after being uniformly stirred. The refractory mortar for blast furnace comprehensive masonry prepared by the invention has the following properties:
(1) the refractoriness is 1700-1730 DEG C
(2) Refractoriness under load of T21650-1670 deg.C
(3) Expansion coefficient (0-1000 deg.C) 4.3-4.8X 10-6/℃
(4) The breaking-resistant bonding strength is more than or equal to 8MPa after being baked at 180 DEG C
At 1300 ℃ for 3 hours, and is more than or equal to 6MPa after being dried
Compared with the prior art, the refractory mortar for blast furnace comprehensive masonry has the advantages of good high-temperature performance, high refractoriness, high loaded softening point, small thermal expansion coefficient and high bonding strength. Because the refractory mortar has good chemical affinity, the refractory mortar is suitable for bonding refractory bricks made of various materials. The refractory mortar has goodconstruction performance, and the refractory mortar cannot flow during construction at normal temperature.
Examples
According to the composition range of the refractory mortar for comprehensive masonry of the blast furnace, three batches of the refractory mortar are prepared, and for the sake of convenient comparison, two kinds of refractory mortar in the prior art, namely high-alumina refractory mortar and silicon carbide refractory mortar, are prepared, the preparation methods of the refractory mortar and the silicon carbide refractory mortar adopt the preparation processes in the prior art, actual construction is carried out on site, and the comparison results are shown in tables 1 and 2. Table 1 shows the composition of the refractory mortar of the present invention compared with the refractory mortar of the prior art. Table 2 is a table comparing the performance of the fire clay after the implementation. In the table, the flexural bond strength of each refractory mortar is measured according to GB5024.3-85 and GB 7317-87.
Table 1 example the composition of the refractory mortar of the invention is compared with that of the prior art refractory mortar
Note: the other inclusion element is calcium oxide. TABLE 2 anti-fracture bond Strength (MPa) of chamotte
| Variety of bricks to be built Temperature of Fire-resistant Kind of mud | High-alumina brick-aluminium Carbon brick | Semi-graphitization of aluminium-carbon brick Silica brick | Semi-graphitization of high-alumina brick Silicon carbide brick | |||||||
| 1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 | ||
| Book (I) Hair-like device Ming dynasty Fruit of Chinese wolfberry Applying (a) to Example (b) | 1#180℃×24hr | 11 | 12 | 13 | 10 | 9 | 10 | 8 | 10 | 10 |
| 130℃×3hr | 10 | 11 | 10 | 1.2 | 6.3 | 7.0 | 7.1 | 6.5 | 6.8 | |
| 2#180℃×24hr | 8 | 9 | 8 | 9 | 10 | 11 | 10 | 12 | 11 | |
| 130℃×3hr | 7. 0 | 7. 2 | 7. 6 | 6.6 | 6.2 | 6.7 | 7.1 | 7.0 | 7.5 | |
| 3#180℃×24hr | 10 | 11 | 12 | 12 | 12 | 13 | 11 | 10 | 11 | |
| High durability Aluminum fire Mud | 130℃×3hr | 7. 8 | 7. 6 | 7. 1 | 7.8 | 8.5 | 8.2 | 6.0 | 6.2 | 7.0 |
| 18℃×24hr | 3. 5 | 4. 0 | 5. 0 | 2.6 | 3.0 | 2.4 | 3.0 | 3.5 | 3.7 | |
| 130℃×3hr | 2. 9 | 2. 2 | 2. 7 | 0.8 | 0.5 | 0.4 | 1.8 | 1.5 | 2.0 | |
| Carbon resistance Fire transformation Silicon mud | 180℃×24hr | 1. 7 | 1. 8 | 8. 0 | 2.7 | 3.1 | 3.0 | 3.7 | 4.0 | 5.0 |
| 130℃×3hr | 2. 3 | 0. 4 | 0. 7 | 2.0 | 2.3 | 2.5 | 2.7 | 3.4 | 3.7 | |
According to the implementation comparison results, the comprehensive masonry refractory mortar for the blast furnace has a good using effect, and all performance indexes of the comprehensive masonry refractory mortar meet the requirements of designers.
Claims (2)
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Claims (2)
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1. The refractory mortar for comprehensive masonry of blast furnace is characterized by comprising 72-76 wt% of aggregate, 24-28 wt% of binder and 0.1-3 wt% of additional curing accelerator, wherein:
A. the content of each chemical component in the aggregate is (weight percent) Al2O360-80％,SiO215-20%, SiC 0-8%, C2-5%, Si 1-3%, and other non-removable components 2-4%;
B. in addition, the chemical components of the adhesive are (wt%) 10-20% of asphalt, 10-70% of phenolic resin, 10-40% of furan resin and 0-30% of tar.
C. 0.1 to 3 percent of aluminate cement, 0 to 3 percent of alkali metal oxide, 0 to 3 percent of alkali metal hydroxide,
2. refractory mortar according to claim 1, characterised in that the setting accelerator is a combination of aluminate cement and either an alkali metal oxide or an alkali metal hydroxide.