Preparation method of refractory brick resistant to molten salt corrosion

A refractory brick and salt corrosion technology, which is applied in the field of new materials, can solve problems such as refractory brick furnace shutdown, and achieve the effects of reducing maintenance costs, strong corrosion resistance, and improving compactness

Inactive Publication Date: 2021-12-31
泰兴瑞深新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the operation of the rotary kiln, the refractory bricks will fall off due to corrosion, which will lead to the shutdown of the furnace. The cost of replacing the refractory bricks is the main operating cost of the high-temperature rotary kiln hazardous waste disposal system.

Method used

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  • Preparation method of refractory brick resistant to molten salt corrosion
  • Preparation method of refractory brick resistant to molten salt corrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of a firebrick resistant to molten salt corrosion, its specific scheme is as follows:

[0021] According to the mass parts, in 50 parts of fly ash, add 1.69 parts of iron oxide powder, make the mixture iron oxide content (mass percentage) be 8.5%, then 1.5 parts of activators (sodium hydroxide and potassium hydroxide according to (mass ratio 1:08 mixed) added to 16 parts of water, mixed evenly, added to fly ash and 20 parts of modified rare earth slag, stirred evenly to form a slurry, and then heated to 55 ° C under stirring for 10 minutes After cooling down to room temperature, add 5.6 parts of zirconia, 0.5 parts of manganese tungstate, 2.3 parts of zinc diborate monoxide and 0.2 parts of yttrium nitrate into the slurry and stir to mix evenly, then pour the slurry into put into the mould, and cured at 25°C for 24 hours to form the refractory brick adobe, then calcined the obtained adobe at 700°C for 60 minutes, then raised the temperature to 800°C...

Embodiment 2

[0024] A preparation method of a firebrick resistant to molten salt corrosion, its specific scheme is as follows:

[0025] According to the mass parts, in 55 parts of fly ash, add 2.96 parts of iron oxide powder, make the mixture iron oxide content (mass percentage) be 10.5%, then 2.2 parts of activators (sodium hydroxide and potassium hydroxide according to (mass ratio 1:1.2 mixed) added to 18 parts of water, mixed evenly, added to fly ash and 28 parts of modified rare earth slag, stirred evenly to form a slurry, and then heated to 65 ° C under stirring for 300 minutes After cooling down to room temperature, add 6.8 parts of zirconia, 1.2 parts of manganese tungstate, 3.2 parts of zinc diborate monoxide and 0.4 parts of cerium nitrate into the slurry and stir to mix evenly, then pour the slurry into put into the mold, cured at 30°C for 72 hours to obtain refractory brick adobe, calcined the obtained adobe at 740°C for 120min, then raised the temperature to 1000°C and calcined...

Embodiment 3

[0028] A preparation method of a firebrick resistant to molten salt corrosion, its specific scheme is as follows:

[0029] According to the mass parts, in 65 parts of fly ash, add 4.78 parts of iron oxide powder, make the mixture iron oxide content (mass percentage) be 12.5%, then 2.8 parts of activators (sodium hydroxide and potassium hydroxide according to Mass ratio 1:1.6 mixed) added to 22 parts of water, mixed evenly, added to fly ash and 35 parts of modified rare earth slag, stirred evenly to form a slurry, and then heated to 75 ° C under stirring to activate 60min, after cooling down to room temperature, add 8.2 parts of zirconia, 1.6 parts of manganese tungstate, 3.8 parts of zinc diborate monoxide and 0.6 parts of cerium nitrate into the slurry and stir to mix evenly, then mix the slurry Pour it into the mold, and cure it at 25°C for 96 hours to obtain the refractory brick adobe. Calcinate the obtained adobe at 780°C for 180 minutes, then raise the temperature to 1200...

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Abstract

The invention relates to the field of new materials, and especially relates to a preparation method of a refractory brick resistant to molten salt corrosion. The method comprises the following steps: adding iron oxide powder into fly ash to increase the content of iron oxide in a mixture, adding an exciting agent into water, uniformly mixing, adding into fly ash and modified rare earth slag, uniformly stirring to form slurry, heating and exciting while stirring, cooling to room temperature, and calcining and vitrifying zirconium oxide, manganese tungstate, zinc diborate oxide and rare earth nitrate to obtain the refractory brick. The refractory brick disclosed by the invention is prepared by using cheap fly ash and waste rare earth slag as main raw materials, doping powder with a function enhancing effect and performing ceramization calcination, and the refractory brick is low in preparation cost, simple in process and relatively good in molten salt corrosion resistance; and the problem that the molten alkali metal salt corrodes the refractory lining of the rotary kiln due to the fact that the alkali metal salt in the waste residues is heated to be in a molten state is effectively solved, and the maintenance cost of the rotary kiln is reduced.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a method for preparing firebricks resistant to molten salt corrosion. Background technique [0002] Refractory bricks are built inside the rotary kiln for hazardous waste incineration to protect the rotary kiln from direct damage from high temperature and corrosion during hazardous waste incineration. The properties of refractory bricks depend on the composition and distribution of their phases and the chemical characteristics of each phase, that is, on the chemical composition of chemical minerals. The main chemical components of refractory bricks used in general hazardous waste incineration rotary kilns include high alumina bricks, magnesia bricks, magnesia alumina bricks and silica bricks. The alumina content in high-alumina bricks is relatively high, generally around 70%; magnesia bricks are mainly minerals composed of magnesia and other metal oxides; state matter. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
CPCC04B35/66C04B35/62204C04B2235/3225C04B2235/3229C04B2235/3272C04B2235/3244C04B2235/326C04B2235/3262C04B2235/3284C04B2235/3409C04B2235/9669
Inventor 周洋洋
Owner 泰兴瑞深新材科技有限公司
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