Light-weight hot-blast furnace pipeline spray paint and application method thereof

A technology of hot blast furnace and coating spraying, which is applied in the field of refractory castables, which can solve the problems of hot blast pipe formwork support, pouring construction difficulties, practicality and thermal shock resistance to be improved, and poor blast furnace production and operating environment, etc., to achieve high temperature volume Strong stability, improved thermal shock stability, and good heat preservation effect

Active Publication Date: 2013-11-20
ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, although increasing the air temperature can save coke and coal for ironmaking, increase pig iron production and reduce the operating cost of the blast furnace, after increasing the air temperature, the N in the air 2 and O 2 Reaction to produce NO X The amount also greatly increased, NO X The refractory material of the hot blast furnace reaches the steel shell, and after encountering water vapor, nitric acid is produced, which will cause corrosion of the steel shell and cause cracking
Therefore, castables are often used for the lining of hot blast stove pipes to resist high-temperature airflow erosion and achieve thermal insulation. The refractory castables that have been used include clay, high alumina, mullite, etc. These materials have been used for many years. From different The degree meets the requirements of use, but there is still the problem of high surface temperature. The temperature of the air duct reaches 300-350 ° C, so energy is wasted and the production and operation environment of the blast furnace is deteriorated. In addition, the hot air duct is difficult to form and cast.
[0003] CN102060499B (2012-10-24) discloses an acid-resistant coating composition for iron-making blast furnace hot blast stove and its application method. However, the composition needs to be cured for a long time, generally more than 3 days. Vibration still needs to be improved

Method used

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  • Light-weight hot-blast furnace pipeline spray paint and application method thereof

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Experimental program
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Effect test

Embodiment 1

[0115] Use the ingredients in formula 1, add water and stir evenly for 8 minutes, then spray and apply, and dry and harden naturally within 25 minutes; natural curing for 20 hours. The method can be sprayed quickly without needing formwork, has good acid resistance, good heat preservation effect and low cost. The specific parameters are shown in Table 1.

Embodiment 2

[0117] Use the ingredients of formula 2, add water and stir evenly for 12 minutes, then spray and apply, and dry and harden naturally within 40 minutes; natural curing for 28 hours.

Embodiment 3

[0119] Use formula three ingredients, add water and stir evenly for 10 minutes, then apply and apply, and dry and harden naturally within 30 minutes; natural curing for 24 hours.

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Abstract

The invention relates to a light-weight hot-blast furnace pipeline spray paint and an application method thereof, belonging to the field of refractory castables. The light-weight hot-blast furnace pipeline spray paint comprises the following components in parts by weight: 40-60 parts of light-weight clay brick, 3-9 parts of perlite, 10-20 parts of high-alumina cement, 20-30 parts of mullite, 5-8 parts of bentonite, 1-3 parts of dextrin powder, 2-6 parts of hydrated alumina, 5-10 parts of organic fiber, 8-18 parts of water glass, 4-9 parts of aluminum dihydrogen phosphate and 10-15 parts of magnesite powder. The spray paint provided by the invention is quick and practical to use, does not need special curing, and has favorable thermal shock resistance.

Description

technical field [0001] The invention relates to a light-weight hot blast stove pipe spray coating and a method for using the same, belonging to the field of refractory castables. Background technique [0002] The hot blast stove is a thermal equipment that heats the air blown into the blast furnace to support combustion from normal temperature to high temperature. Using blast furnace gas and coke oven gas as fuel, the air is heated to about 1300°C. The hot blast stove pipe is a device for transporting high temperature hot air, which requires high temperature resistance. In addition, although increasing the air temperature can save coke and coal for ironmaking, increase pig iron production and reduce the operating cost of the blast furnace, after increasing the air temperature, the N in the air 2 and O 2 Reaction to produce NO X The amount also greatly increased, NO X The refractory material reaches the steel shell through the hot blast stove, and after encountering wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B12/04
Inventor 常正钦李新明王琪佘春萍彭晶晶
Owner ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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