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Anhydrous stemming and preparation method thereof

An anhydrous taphole mud and particle size technology, applied in the field of refractory materials and metallurgy, can solve the problems of large fluctuation of product performance, uneven mixing of tappet mud, change of particle gradation, etc., to achieve rich output, good product stability, The effect of high-speed dispersion

Inactive Publication Date: 2013-03-06
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the perspective of production technology, traditional gun clay is made by using wheel mills and relying on rolling. If the rolling time is short, the mixing will not be sufficient, and long-term rolling will easily crush the particles and change the particle size distribution.
In addition, the wheel-milling production of gunpowder often mixes unevenly, resulting in large fluctuations in product performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Ingredients are prepared according to the following ratio of raw materials: 13% of brown corundum of 3~1mm, 12% of brown corundum of 1~0.088mm, 10% of fine powder of brown corundum, 5% of silicon carbide of 1~0.088mm, silicon carbide 10% fine powder, 13% coke powder, 12% plastic clay, 15% red stone, 4% ferrosilicon nitride, 6% high-temperature asphalt, plus 2% borax and 18% tar.

[0033] Dry mix the above raw materials in a strong mixer for 2 minutes first, then add tar from the oil filling hole while stirring, fine-tune the amount of tar added according to the condition of the clay after stirring for 5 minutes, continue stirring for 20 minutes, and press into shape with a mud extruder. The rotor speed of the mixer is 600r / min, the temperature of the mud after mixing is 52°C, the compression value is 9.5mm, and the Masha value is 820KPa.

[0034] The physical and chemical properties of the gun clay: the bulk density at 200°C×72h is 1.99g / cm 3 , the flexural ...

Embodiment 2

[0036] Example 2: Ingredients are prepared according to the following ratio of raw materials: 10% of brown corundum of 3~1mm, 10% of brown corundum of 1~0.088mm, 13% of brown corundum fine powder, 7% of α-alumina fine powder, silicon carbide fine powder 9.8%, 0.2% of 1~0.088mm silicon carbide, 14% of coke powder, 14% of plastic clay, 10% of red stone, 8% of ferrosilicon nitride, 4% of high temperature asphalt, plus 1% of borax and 19.6% of tar.

[0037] Dry mix the above raw materials in a strong mixer for 2 minutes first, then add 90% tar, after stirring for 5 minutes, fine-tune the amount of tar added according to the situation of the mud, and then stir for 25 minutes, the rotor speed of the mixer is 700r / min, and the mud after mixing The temperature is 56°C, the compression value is 10mm, and the Marshall value is 900KPa.

[0038] The physical and chemical properties of the gun clay: the bulk density at 200°C×72h is 1.98g / cm 3 , the flexural strength is 3.4MPa, the compres...

Embodiment 3

[0040] Example 3: Ingredients are prepared according to the following raw materials: 8% of brown corundum of 3~1mm, 7% of brown corundum of 1~0.088mm, 10% of fine powder of brown corundum, 5% of α-alumina fine powder, carbonization of 1~0.088mm 5% silicon, 10% silicon carbide fine powder, 18% coke powder, 16% plastic clay, 13% red stone, 8% high-temperature asphalt, plus 1.5% boric acid and 14% tar.

[0041] Dry mix the above raw materials in a strong mixer for 2 minutes, then add tar, and stir for another 25 minutes, the rotor speed of the mixer is 500r / min, the temperature of the mud after mixing is 50°C, the compression value is 10mm, and the Masha value is 950KPa .

[0042] The physical and chemical properties of gun clay are: the bulk density at 200℃×72h is 1.98g / cm 3 , the flexural strength is 3.8MPa, the compressive strength is 15.8MPa; the line change of 1000℃×3h is -1.18%, and the bulk density is 1.94g / cm 3 , the flexural strength is 4.3MPa, the compressive strength...

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Abstract

The invention provides an anhydrous stemming and a preparation method thereof. The anhydrous stemming is composed of the following raw materials: 15 to 25 % of corundum aggregate, 10 to 20 % of corundum powder, 10 to 15 % of redstone, 10 to 15 % of silicon carbide, 0 to 8 % of silicon nitride iron, 12 to 16 % of plastic clay, 13 to 18 % of coke powder, 4 to 8 % of high-temperature asphalt, 1 to 2 % of applied borax or boric acid and 14 to 20 % of applied tar. The preparation method is characterized by using a production apparatus such as a powerful mixer, and comprising steps of: blending the above raw materials, dry-mixing in the mixer for 1 to 2 minutes, adding 80 to 90 % of the tar with stirring, finely adjusting an adding amount of the tar in accordance with the stemming situation after stirring for 2 to 10 minutes, continuously stirring for 15 to 30 minutes, and molding with compression by using an extruder. The stemming provided by the invention has good performances of rapid sintering and high temperature, shrinks relatively small after being burnt, and can greatly reduce adverse phenomena of large mud, broken iron notch, long-time splashing, rapid hole reaming, etc. A new production technology is employed to ensure long-term stability of product quality, and thus the stemming has good workability and using performance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials and metallurgy, and relates to high-performance anhydrous taphole mud for blast furnace tapholes and a preparation method thereof. In particular to a tar-pitch bonded Al 2 o 3 -SiO 2 -SiC-C quality high-performance anhydrous taphole clay and its new preparation process. Background technique [0002] Gun clay is a key refractory material related to the smooth operation of the blast furnace during the blast furnace smelting process. [0003] With the rapid development of my country's iron and steel industry, blast furnaces continue to develop in the direction of large-scale, long-life, and intensified smelting, and the requirements for the performance of anhydrous taphole mud are getting higher and higher. Now it is required to have multiple properties: good workability (filling, opening), air permeability, sintering, combination of old and new gun mud, erosion resistance and erosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 张正富范咏莲刘兴平赵军张君博陈博邱海龙张雯文
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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