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Magnesium-iron-aluminum spinel sand and preparation method thereof

A technology of magnesia-iron-aluminum spinel and magnesium oxide, which is applied in the field of refractory materials and its preparation, can solve problems such as unsatisfactory, limited flexibility, and prone to problems, so as to resist kiln spalling, improve structural flexibility, and reduce production cost effect

Active Publication Date: 2013-11-27
营口佳镁耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Magnesium-aluminum spinel refractories were widely used at first, but due to limited flexibility, problems are prone to occur especially in high-stress tire parts
[0010] The thermal shock performance of magnesia-iron spinel is better than that of magnesia-chrome bricks, and it is similar to magnesia-chrome bricks in terms of adhesion to the kiln skin. Although the service life is one month longer than that of magnesia-chrome bricks, reaching 10-12 months, it still cannot meet the requirements. The needs of the cement industry

Method used

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  • Magnesium-iron-aluminum spinel sand and preparation method thereof

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Effect test

Embodiment 1

[0030] Embodiment 1 A kind of magnesium iron aluminum spinel sand and preparation method thereof

[0031] Raw material: magnesium oxide: MgO 95.3%;

[0032] Iron oxide: Fe 2 o 3 95.6%;

[0033] Aluminum oxide Al 2 o 3 91.5%.

[0034] The preparation method is as follows:

[0035] 1) Crushing and sieving: crush the magnesium oxide, and take the 200-mesh sieve; pulverize the iron oxide, and take the 400-mesh sieve; pulverize the alumina, and take the 500-mesh sieve;

[0036] 2) Batching and mixing: the crushed and screened magnesium oxide, iron oxide and aluminum oxide are proportioned in parts by weight: 28 parts of magnesium oxide, 38 parts of iron oxide and 34 parts of aluminum oxide are taken, and the materials are mixed after the proportioning Mix in the machine, and add 5% binder water of the total weight of the mixture at the same time, and mix evenly;

[0037] 3) Compaction into balls: After the materials are mixed evenly, they are compacted by ...

Embodiment 2

[0043] Embodiment 2 A kind of magnesium iron aluminum spinel sand and preparation method thereof

[0044] Raw materials: magnesium oxide: MgO 96.8%;

[0045] Iron oxide: Fe 2 o 3 97.3%;

[0046] Alumina: Al 2 o 3 96.2%.

[0047] The preparation method is as follows:

[0048] 1) Crushing and sieving: crush the magnesium oxide, and take the 200-mesh sieve; pulverize the iron oxide, and take the 400-mesh sieve; pulverize the alumina, and take the 500-mesh sieve;

[0049] 2) Batching and mixing: the crushed and screened magnesium oxide, iron oxide and aluminum oxide are proportioned in parts by weight: 38 parts of magnesium oxide, 34 parts of iron oxide and 28 parts of aluminum oxide are taken, and the materials are proportioned and put into the mixture Mix in the machine, and add binder water with 15% of the total weight of the mixture at the same time, and mix evenly;

[0050] 3) Compaction into balls: After the materials are mixed evenly, they are co...

Embodiment 3

[0056] Embodiment 3 A kind of magnesium iron aluminum spinel sand and preparation method thereof

[0057] Raw materials: magnesium oxide: MgO 97.6%;

[0058] Iron oxide: Fe 2 o 3 98.2%;

[0059] Alumina: Al 2 o 3 97.4%.

[0060] The preparation method is as follows:

[0061] 1) Crushing and sieving: crush the magnesium oxide, and take the 200-mesh sieve; pulverize the iron oxide, and take the 400-mesh sieve; pulverize the alumina, and take the 500-mesh sieve;

[0062] 2) Batching and mixing: the crushed and screened magnesia, iron oxide and aluminum oxide are proportioned by weight: 34 parts of magnesia, 33 parts of iron oxide and 33 parts of aluminum oxide are taken, and put into the mixture after the material ratio Mix the mixture in the machine, and add 10% binder water of the total weight of the mixture at the same time, and mix evenly;

[0063] 3) Compaction into balls: After the materials are mixed evenly, they are compacted by a compactor, an...

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Abstract

The invention relates to magnesium-iron-aluminum spinel sand and a preparation method thereof. The invention adopts the technical scheme that the method comprises the following steps of: crushing magnesium oxide, iron oxide and aluminum oxide respectively; weighing materials in part by weight, feeding the materials into a mixer for mixing, adding a bonding agent in an amount which is 5 to 15 percent of total weight of the mixture, and mixing uniformly; compacting the uniformly mixed materials by a compactor, and feeding the compacted materials into a ball press to form balls; drying and dehydrating the formed balls, and naturally drying the balls for 2 to 5 days; putting the dried material balls into an electric arc furnace, and melting the balls at the temperature of between 2,800 and 3,200 DEG C; and naturally cooling the sintered product for 6 to 7 days, and crushing. The spinel sand is an alkali chromium-free refractory material; the product is applied to a glass kiln or a cement kiln and sintered into belts; and the spinel sand is hung on the surface of the kiln firmly, protects a refractory brick body, prolongs the service life, reduces the consumption of the refractory material, reduces the maintenance cost, improves the yield of glass and cement, meets the performance requirement of kiln refractory bricks, more importantly, replaces the use of chrome bricks, and solves chrome pollution nuisance.

Description

technical field [0001] The invention relates to a refractory material and a preparation method thereof, in particular to a refractory material magnesium-iron-aluminum spinel sand used in a cement rotary kiln and a preparation method thereof. Background technique [0002] In the past, magnesia-chrome bricks, an alkaline refractory material, were used as the furnace lining for high-temperature firing of cement kilns. However, in the high-temperature oxidizing atmosphere of cement rotary kilns, magnesia-chrome bricks react with alkali metal oxides in cement materials to produce chromium that is harmful to humans. Acid and alkali, and highly toxic Cr dissolved in water is also produced in the used magnesia-chrome bricks 6+ , causing serious pollution to the environment. Replacing magnesium-chromium materials with chromium-free materials is the general trend of protecting the ecological environment, and it is an issue that our country should pay attention to in order to maintain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 徐长松
Owner 营口佳镁耐火材料有限公司
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