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A kind of carbon/calcium aluminate composite powder and preparation method thereof

A technology of calcium aluminate and composite powder, applied in the preparation of calcium aluminate, alkaline earth metal aluminate/alumina/aluminum hydroxide, carbon compounds, etc., can solve the problem of limiting the application of carbon-containing castables, affecting the service life of materials, Easy to be oxidized and other problems, to achieve the effect of reducing production cost, reducing energy consumption, improving dispersibility and wettability

Active Publication Date: 2018-07-13
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon has poor dispersion and wettability in castables and is easily oxidized, which affects the service life of materials and limits the wider application of carbon-containing castables

Method used

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  • A kind of carbon/calcium aluminate composite powder and preparation method thereof
  • A kind of carbon/calcium aluminate composite powder and preparation method thereof
  • A kind of carbon/calcium aluminate composite powder and preparation method thereof

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preparation example Construction

[0036] The preparation method of the carbon / calcium aluminate composite powder comprises taking organic acid calcium, calcium peroxide, aluminum powder and alumina as raw materials, and adopting a self-propagating high-temperature synthesis method to prepare the carbon / calcium aluminate composite powder. The calcium organic acid is one of calcium oxalate, calcium gluconate, calcium citrate and calcium stearate.

[0037] In terms of mass percentage, the calcium organic acid in the raw material is 1.6% to 16%, the calcium peroxide in the raw material is 30% to 38%, the aluminum powder in the raw material is 9% to 15%, and the alumina in the raw material is 42% to 50%. , the above-mentioned raw materials are integrated into 100%.

[0038] Specifically, combine figure 1 , the self-propagating high-temperature synthesis method of the present invention comprises organic acid calcium, calcium peroxide, aluminum powder and aluminum oxide by CaO-Al 2 o 3 The phase diagram is used fo...

Embodiment 1

[0044]This embodiment adopts calcium peroxide powder (purity ≥ 99.0%), calcium oxalate powder (purity ≥ 99.0%), aluminum powder (purity ≥ 99.0%) and alumina powder (purity ≥ 99.0%) as raw materials, calculated by mass percentage , calcium peroxide powder (purity ≥ 99.0%) is 30.59%, calcium oxalate powder (purity ≥ 99.0%) is 13.60%, aluminum powder (purity ≥ 99.8%) is 13.38%, alumina (purity ≥ 99.0%) is 42.43 %. Put the uniformly mixed raw materials into the crucible, and then lightly press them into shape. After the molding is completed, put the sample into the self-propagating high-temperature reaction furnace, place C-Ti igniter on the sample, and self-propagating high-temperature synthesis The reaction is initiated by the heat generated by the C-Ti reaction placed on the top of the sample, while the C and Ti reactions are initiated by a tungsten wire.

[0045] Under the conditions of vacuuming (vacuum degree is -0.092MP) and argon filling, the sample is ignited and ignited...

Embodiment 2

[0048] The difference between this embodiment and Example 1 is: by mass percentage, calcium peroxide powder (purity ≥ 99.0%) is 35.40%, calcium oxalate powder (purity ≥ 99.0%) is 15.72%, aluminum powder (purity ≥ 99.8%) ) was 15.47%, and alumina (purity ≥ 99.0%) was 33.41%; finally, a carbon / calcium aluminate composite powder with a particle size ≥ 200 meshes was obtained.

[0049] Carry out X-ray diffraction analysis and Raman spectrum analysis to the carbon / calcium aluminate composite powder prepared in embodiment 2, see Figure 4 and 5 . in Figure 5 Show 1353cm -1 D peak of disordered carbon structure appears, 1586cm -1 G peak of graphitized structure appears, 2707cm -1 2D peaks of multilayer graphene appear. Explain that the elemental carbon in the carbon / calcium aluminate composite powder prepared in Example 2 is a mixture of various structural forms containing carbon, and the actual carbon element content is 1.61% as measured by a high-frequency infrared carbon-su...

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Abstract

The invention discloses a carbon / calcium aluminate composite powder and a preparation method thereof. The prepared calcium aluminate cement contains a certain amount of elemental carbon, and the elemental carbon is a mixture of various structural forms containing carbon. Body, wherein the actual content of carbon is 0.3% to 2%. The preparation process includes batching the raw materials calcium peroxide, calcium organic acid, aluminum powder and aluminum oxide according to the stoichiometric ratio, wherein the calcium organic acid is one of calcium oxalate, calcium gluconate, calcium citrate and calcium stearate; Then the symmetrical raw materials are mixed; the uniformly mixed materials are molded, and the carbon / calcium aluminate composite powder is prepared by a self-propagating high-temperature synthesis method. The preparation method has high product purity, high energy utilization rate, is economical and environmentally friendly, and conforms to the sustainable development concept of energy saving, consumption reduction, emission reduction and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, in particular to a composite powder containing carbon / calcium aluminate and a preparation method thereof. technical background [0002] Carbon-containing castables have good slag resistance and thermal shock stability due to the presence of different forms of carbon. At the same time, this type of material has high refractoriness, excellent load deformation temperature and high-temperature strength. However, carbon has poor dispersion and wettability in castables and is easily oxidized, which affects the service life of materials and limits the wider application of carbon-containing castables. [0003] The key to the development of castables is the binder. The most widely used binder is hydraulic calcium aluminate cement, and its phase composition is mainly CA and CA2. While synthesizing the binder calcium aluminate cement through the combustion synthesis method, carbon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/16C01B32/00C04B7/32C04B35/66
CPCC01F7/164C01P2002/72C01P2002/82C01P2004/80C01P2006/80C04B7/32C04B35/66C04B2235/3222C04B2235/422
Inventor 任耘石佳佳肖国庆丁冬海杨守磊
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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