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Ferrosilicon nitride-aluminum chromium slag refractory material for cement kiln transition zone and preparation method

A technology of ferrosilicon nitride and refractory materials, applied in the field of refractory materials, can solve the problems of limited popularization, large thermal conductivity, poor corrosion resistance, etc., and achieve improved toughness and ability to withstand thermal stress impact, low porosity, and anti-corrosion Good thermal shock effect

Active Publication Date: 2017-01-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large thermal conductivity and poor corrosion resistance of the former, the latter will react with cement clinker and have poor corrosion resistance, which limits the promotion and use of cement kiln transition zones in my country in the future.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: a kind of preparation method of ferrosilicon nitride-aluminum chromium slag refractory material for cement kiln transition zone, by weight percentage, raw material composition is: 40% particle size is the aluminum chromium slag of 3-1mm, 25% particle size is 1-0mm aluminum chromium slag, 10% aluminum chromium slag with a particle size of 200 mesh, 10% alumina micropowder with a particle size of 325 mesh, 15% ferrosilicon nitride with a particle size of 200 mesh, plus 3.5% of the total amount of the above-mentioned raw materials. Resin is the binder. During production, firstly weigh various raw materials according to the ratio, mix them evenly, and obtain mud through mixing, then press it into shape with a friction press, dry at 150°C for 25h, and nitriding in a nitriding shuttle kiln at 1300°C for 10h .

[0021] The performance index of the obtained product is: apparent porosity 14.9%, bulk density 3.08g / cm 3 , normal temperature compressive strength 85M...

Embodiment 2

[0022] Embodiment 2: production technology is identical with embodiment 1, and difference is:

[0023]In terms of weight percentage, the raw material composition is: 40% aluminum chromium slag with a particle size of 3-1mm, 25% aluminum chromium slag with a particle size of 1-0mm, 5% aluminum chromium slag with a particle size of 200 mesh, and 10% aluminum chromium slag with a particle size of 325 mesh. Aluminum micropowder, 20% ferrosilicon nitride with a particle size of 200 mesh, plus 3.5% of the total amount of the above-mentioned raw materials are thermosetting phenolic resin as a binder. Nitriding in a nitriding shuttle kiln at 1400°C for 10 hours.

[0024] The performance index of the obtained product is: apparent porosity 15.1%, bulk density 3.05g / cm 3 , normal temperature compressive strength 98MPa, load softening temperature 1680 ℃, thermal shock resistance (1100 ℃, water cooling) 15 times, its corrosion resistance and wear resistance are good.

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Abstract

The invention discloses a ferro-silicon nitride / alumina-chrome slag refractory matter for a cement kiln transition zone and a preparation method of the refractory matter, and belongs to the field of refractory matters. The refractory matter consists of the following raw materials: alumina-chrome slag, alumina micro powder and ferro-silicon nitride, and thermosetting phenolic resin is taken as a binding agent. During producing, the preparation method comprises the following steps: weighing various raw materials, uniformly mixing, compressing and moulding, drying as well as nitriding and sintering at 1200-1450 DEG C. The alumina-chrome slag, which is waste generated from the production of metallic chromium, basically has no industrial utilization value at present, the alumina-chrome slag contains 82-85wt% of aluminum oxide and 11-13wt% of chromium oxide, and mainly represented as a corundum-chromium oxide solid solution, the alumina-chrome slag is good in abrasion performance. By combining the ferro-silicon nitride and high-cost-performance alumina-chrome slag to generate beta-sialon from a reaction, the product disclosed by the invention is simple in process and low in cost, and excellent performance indexes are as follows: apparent porosity is 13-17%, volume density is 2.94-3.30g / cm<3>, cold crushing strength is 67-150MPa, refractoriness under load is higher than 1550 DEG C and thermal shock resistance is more than 12 times; and the refractory matter disclosed by the invention is excellent in abrasion performance and erosion resistance and is applicable to the cement kiln transition zone, and meanwhile, the recycling of the alumina-chrome slag is achieved.

Description

technical field [0001] The invention relates to preparing a refractory material for a cement kiln, in particular to a ferrosilicon nitride-aluminum chromium slag refractory material for a transition zone of a cement kiln and a preparation method thereof, belonging to the field of refractory materials. Background technique [0002] With the continuous improvement of the daily output of cement rotary kiln and the continuous development of solid waste cement co-processing technology, the future development trend of my country's cement kiln is bound to develop in the two directions of longevity and multi-functionality, and the development of new refractory materials for cement kilns It is an urgent problem to be solved at present. The new cement rotary kiln can be divided into five parts: kiln mouth cooling zone, lower transition zone, firing zone, upper transition zone and preheating zone. Due to the different working conditions of each part, the reasons for the damage to the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 李勇林鑫秦海霞
Owner UNIV OF SCI & TECH BEIJING
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