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A kind of carbon black/calcium aluminate cement, preparation method and application thereof

A technology of calcium aluminate cement and carbon black, applied in the field of inorganic non-metallic materials, can solve the problems of poor flowability of castables, difficult to disperse uniformly, poor performance of refractory castables, etc. Simple process, improved antioxidant effect

Active Publication Date: 2019-09-13
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of carbon-containing castables still faces the following challenges: (1) The wettability of carbon materials with water is poor; compared with oxides, the specific gravity is small, and it is difficult to disperse evenly in the castable, which increases the water demand and the flow of the castable (2) Carbon materials are easily oxidized at high temperatures, which limits the excellent performance of carbon materials. Metallic aluminum antioxidants suitable for carbon-containing shaped refractory materials are used in refractory castables for easy hydration, so that the performance of refractory castables can be improved. become worse
Surfactant method, graphite granulation method and surface coating method are often used to improve the above shortcomings, but there are still problems such as uneven distribution of carbon materials in castables and easy peeling of coatings.

Method used

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  • A kind of carbon black/calcium aluminate cement, preparation method and application thereof
  • A kind of carbon black/calcium aluminate cement, preparation method and application thereof
  • A kind of carbon black/calcium aluminate cement, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0037] In this embodiment, alumina micropowder (purity ≥ 99.0%, particle size ≤ 74 μm), calcium oxide powder (calcined by calcium carbonate, particle size ≤ 48 μm) and carbon black (particle size ≤ 65nm) are used as raw materials, calculated by mass percentage, Aluminum oxide (purity ≥ 99.0%) is 62.53%, calcium oxide (purity ≥ 99.0%) is 27.47%, carbon black is 10%, and the sum of the mass percentages of aluminum oxide, calcium oxide and carbon black is 100%.

[0038] The above-mentioned raw materials were mixed by ball milling, dried, and compacted, passed through a non-oxidizing atmosphere (embedded carbon), put the sample into the schematic diagram of the embedded carbon device shown in Figure 1, and sintered in a high-temperature resistance furnace at 1400 ° C for 4 hours to form carbon. Black / calcium aluminate cement.

[0039] Carry out X-ray diffraction analysis and SEM analysis to the prepared carbon black / calcium aluminate cement, obtain XRD collection of illustrative p...

Embodiment 2

[0041] The difference between this embodiment 2 and embodiment 1 is: the concentration of PVP aqueous solution is 2.5wt%, by mass percentage, the amount of PVP aqueous solution mixed with dispersant in the raw material is 80.39%, carbon black in the raw material is 1.96%, oxidation in the raw material The aluminum micropowder is 12.24%, the calcium oxide in the raw material is 5.41%, the PVP aqueous solution, the sum of the mass percentages of carbon black, alumina micropowder and calcium oxide is 100%. Its implementation process is consistent with embodiment 1.

[0042] Carry out X-ray diffraction analysis and SEM analysis to the carbon black / calcium aluminate cement that embodiment 2 prepares, see Figure 4 and 5 , indicating that the main phase composition of the carbon black / calcium aluminate cement prepared in Example 2 is the same as that of Example 1. Since the carbon black in the product is amorphous, no carbon peak appears in the phase. It can be seen from SEM that ...

Embodiment 3

[0044] The difference between this embodiment 3 and embodiment 1 is: the concentration of the PVP aqueous solution is 5wt%, by mass percentage, the amount of PVP aqueous solution doped in the raw material is 67.75%, the carbon black in the raw material is 3.23%, and the aluminum oxide micropowder in the raw material 20.20%, the calcium oxide in the raw material is 8.82%, and the mass percent sum of PVP aqueous solution, carbon black, alumina micropowder and calcium oxide is 100%. Its implementation process is consistent with embodiment 1.

[0045] Carry out X-ray diffraction analysis and SEM analysis to the carbon black / calcium aluminate cement that embodiment 3 prepares, see Figure 6 and 7, indicating that the main phase composition of the carbon black / calcium aluminate cement prepared in Example 3 is the same as that of Example 1. Since the carbon black in the product is amorphous, no carbon peak appears in the phase. It can be seen from SEM that CA / CA in the product 2 T...

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Abstract

The invention relates to a carbon black / calcium aluminate cement, a preparation method and application thereof. The preparation process includes: mixing alumina, calcium oxide, carbon black and dispersants of different concentrations (polyvinylpyrrolidone aqueous solution) through ball milling, Drying, compacting, and one-step sintering in a non-oxidizing atmosphere to prepare carbon black / calcium aluminate cement. The carbon content in carbon black / calcium aluminate cement is controllable, and the problem of poor water wettability of carbon black is effectively solved, and the carbon black in the prepared carbon black / calcium aluminate cement has better water resistance. Oxidation, can be more widely used in the field of carbon-containing castables.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a carbon black / calcium aluminate cement, a preparation method and an application thereof. Background technique [0002] Unshaped refractories have the advantages of convenient construction, energy saving and good integrity. Among them, the refractory castables combined with calcium aluminate cement have the largest output, and are widely used in high-temperature blast furnace tapping channels, torpedo tanks, steel ladles, and cement rotary kiln linings. environment. However, refractory castables have poor resistance to slag erosion and spalling, which limits their use in key parts such as ladle slag lines. [0003] Graphite has the characteristics of low thermal expansion coefficient, high thermal conductivity, and poor wetting of molten steel and slag. Adding it to castables will significantly improve the thermal shock resistance and slag re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/32C04B35/66C04B7/36C04B7/38C04B7/42C04B7/44
Inventor 肖国庆李盼盼丁冬海杨守磊
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY