Magnesium-ferrum-aluminum composite spinel brick for large-scale cement kiln and preparation method thereof
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A technology of magnesia-aluminum spinel and iron-aluminum spinel is applied in the field of refractory materials, which can solve problems such as pollution, and achieve the effects of simple process, long operation time and improved operation rate.
Inactive Publication Date: 2012-02-08
TONGDA REFRACTORY TECH CO LTD +1
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[0003] The purpose of the invention is to solve the Cr 6+ To solve the problem of serious pollution, we provide a cost-effective magnesium-iron-aluminum composite spinel brick for large-scale cement kilns, which is to add industrial dextrin and pulp waste liquid to high-purity magnesia, magnesium-aluminum spinel, and iron-aluminum spinel Pressed and sintered refractory bricks
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Embodiment 1
[0014] Magnesium-iron-aluminum composite spinel bricks for large cement kilns, the weight ratio of each component is:
[0015] High-purity magnesia ≤5mm MgO≥97% 80%
[0016] Magnesium aluminum spinel ≤3mm MgO≥50%, Al 2 o 3 ≥50% 15%
[0017] Fe-aluminum spinel ≤3mm FeO≥60%, Al 2 o 3 ≥40% 5%
[0018] Binding agent:
[0019] Industrial dextrin 0.7%
[0020] Pulp waste liquid 2.5%
[0021] The above raw materials are mixed according to the required ratio, and made into mud in a mixer, and molded under a pressure of 400T. After molding, the adobe is fired in a tunnel kiln or a shuttle kiln at 1500°C.
Embodiment 2
[0023] Magnesium-iron-aluminum composite spinel bricks for large cement kilns, the weight ratio of each component is:
[0024] High-purity magnesia ≤5mm MgO≥97% 85%
[0025] Magnesium aluminum spinel ≤3mm MgO≥50%, Al 2 o 3 ≥50% 5%
[0026] Fe-aluminum spinel ≤3mm FeO≥60%, Al 2 o 3 ≥40% 10%
[0027] Binding agent:
[0028] Industrial dextrin 0.5%
[0029] Pulp waste liquid 3%
[0030] The above raw materials are mixed according to the required ratio, and made into mud in a mixer, and molded under a pressure of 600T. After molding, the adobe is fired at 1600°C in a tunnel kiln or a shuttle kiln.
Embodiment 3
[0032] Magnesium-iron-aluminum composite spinel bricks for large cement kilns, the weight ratio of each component is:
[0033] High-purity magnesia ≤5mm MgO≥97% 75%
[0034] Magnesium aluminum spinel ≤3mm MgO≥50%, Al 2 o 3 ≥50% 15%
[0035] Fe-aluminum spinel ≤3mm FeO≥60%, Al 2 o 3 ≥40% 10%
[0036] Binding agent:
[0037] Industrial dextrin 0.2%
[0038] Pulp waste liquid 5%
[0039] The above raw materials are mixed according to the required ratio, and made into mud in a mixer, and molded under a pressure of 500T. After molding, the bricks are fired at 1700°C in a tunnel kiln or a shuttle kiln.
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Abstract
The invention relates to a magnesium-ferrum-aluminum composite spinel brick for a large-scale cement kiln and a preparation method thereof, belonging to the field of refractory materials. The preparation method is characterized by comprising the following steps: by using high-purity magnesia, magnesia alumina spinel and hercynite as main raw materials and using pulp waste liquid and industrial dextrin as binders, mixing, pressing, drying, and firing at 1500-1700 DEG C to obtain the magnesium-ferrum-aluminum composite spinel brick. The product is applicable to firing zones and transition zones of cement kilns in all sizes, and can completely substitute magnesia-chromite bricks in the aspects of performance and cost, thereby implementing no chromium in the cement kiln refractory material. The product has obvious kiln skin adhesion effect, has the advantages of high heat and vibration stability, high temperature toughness and long running time (longer than 12 months), and performs very active functions on enhancing the running rate of the large-scale cement rotary kiln; and the fired magnesium-ferrum-aluminum composite spinel brick has the advantages of simple technique and low cost.
Description
technical field [0001] The invention belongs to the field of refractory materials, and relates to a magnesium-iron-aluminum composite spinel brick for large cement kilns and a manufacturing method thereof. Background technique [0002] With the continuous updating of cement production technology, the rotary kiln, the main equipment of cement production, has been developed to be large-scale and long-lived. In particular, increasing output, improving quality, saving energy consumption and reducing pollution have become the key to increasing efficiency in production management. The high temperature zone of the dry process cement kiln can be divided into a firing zone and a transition zone. The kiln lining in the high temperature zone of the cement kiln is subject to the most severe thermal, mechanical and chemical damage. 60-70% of the total consumption of refractory materials in the whole kiln system occurs at high temperature. The belt is the part with the harshest conditions...
Claims
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