Low-heat-conductivity multi-layer composite magnesium-hercynite brick and preparation process thereof
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A magnesium-iron-aluminum spinel, multi-layer composite technology, applied in lighting and heating equipment, furnace types, furnaces, etc. Reduce the surface temperature of the cylinder and solve the effect of high energy consumption
Pending Publication Date: 2021-11-26
郑州瑞泰耐火科技有限公司
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[0004] Aiming at the deficiencies of the prior art, the present invention provides a low thermal conductivity multi-layer composite magnesia-iron-aluminum spinel brick and its preparation process, which has the advantages of low thermal conductivity and can be used at high temperatures, and solves the problem of the existing cement kiln. Magnesia-iron spinel bricks have problems of high energy consumption and short service life
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[0027] see Figure 1-2 , a low thermal conductivity multilayer composite magnesia-iron-aluminum spinel brick in this embodiment, comprising a working layer 1, a heat insulating layer 2 fixedly connected to the working layer 1, and a heat insulating layer 3 arranged in the heat insulating layer 2, wherein A notch recessed inward is provided on the side wall of the thermal insulation layer 2 away from the working layer 1, and the thermal insulation layer 3 is fixedly connected inside the notch.
[0028] The working layer 1 in this embodiment is prepared by aggregate, powder and external binder according to the following proportions by weight:
[0029] Aggregate: 55wt%, including 10wt% of microporous high-purity magnesia with a particle size of 0-1mm, 35wt% of microporous high-purity magnesia with a particle size of 1-3mm, and 15wt% of light forsterite with a particle size of 3-5mm;
[0049] Such as Figure 1-2 As shown, a low thermal conductivity multilayer composite magnesia-iron-aluminum spinel brick in this embodiment includes a working layer 1, an insulating layer 2 fixedly connected to the working layer 1, and an insulating layer 3 arranged in the insulating layer 2 , wherein, the side wall of the thermal insulation layer 2 away from the working layer 1 is provided with an inwardly recessed gap, and the thermal insulation layer 3 is fixedly connected to the inside of the gap.
[0050] The working layer 1 in this embodiment is prepared by aggregate, powder and binder according to the following proportions by weight:
[0051] Aggregate: 55wt%, including 15wt% of microporous high-purity magnesia with a particle size of 0-1mm, 25wt% of microporous high-purity magnesia with a particle size of 1-3mm, and 20wt% of light forsterite with a particle size of 3-5mm;
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Abstract
The invention relates to a low-heat-conductivity multi-layer composite magnesium-hercynite brick and a preparation process thereof. The low-heat-conductivity multi-layer composite magnesium-hercynite brick is prepared from the following raw materials in percentage by weight: 70-95% of microporous high-purity magnesia, 4-15% of hercynite, 2-10% of light forsterite, and 1-5% of a binding agent in a working layer, and 10-50% of microporous high-purity magnesia, 50-80%of light forsterite and 1-10% of nano aluminum oxide micro powder in a heat insulation layer. The heat insulation layer is a nano aerogel plate. According to the low-heat-conductivity multi-layer composite magnesium-hercynite brick and the preparation process thereof, the overall volume density is small, the heat conductivity coefficient is far lower than that of an existing product, the energy consumption of a thermotechnical kiln can be remarkably reduced, the purposes of saving energy and reducing consumption are achieved, and in the actual production process, production and preparation are convenient and efficient, so that actual application and popularization are facilitated, and therefore, the problems of high energy consumption and short service life of the existing cement kiln adopting pleonaste bricks are effectively solved.
Description
technical field [0001] The invention relates to the technical field of refractory and energy-saving materials, in particular to a low thermal conductivity multi-layer composite magnesium-iron-aluminum spinel brick and a preparation process thereof. Background technique [0002] Cement rotary kiln belongs to building materials equipment, and it is a kind of lime kiln. According to the different processing materials, rotary kiln can be divided into cement rotary kiln, metallurgical chemical rotary kiln and lime rotary kiln, while cement rotary kiln is cement clinker dry process and wet process. The main equipment of the production line, the firing zone of the cement kiln has a high temperature. Under the action of high temperature, the cement raw material melts into a high-temperature liquid in this part, which has a strong erosive force on the refractory material. At present, magnesia-iron spinel is generally used in this part. brick. [0003] Most of the existing magnesia-i...
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