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Method for preparing composite molten steel heat preservation agent based on blast furnace slag

A technology of composite molten steel and heat preservation agent, which is applied in the direction of improvement of process efficiency and recycling technology, etc. It can solve the problems of poor spreadability of molten steel heat preservation agent, unstable heat preservation effect, and influence on steel structures, etc., and achieves no dust flying and low specific gravity , the effect of protecting the environment

Inactive Publication Date: 2016-09-21
郭迎庆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that the thermal insulation agent for molten steel prepared from carbonaceous materials has poor spreadability, unstable thermal insulation effect, and will react with components in molten steel, reducing the thermal insulation effect and affecting the steel structure. In the present invention, the blast furnace slag and hydrochloric acid are first stirred and mixed, and after impurities are removed, the obtained filter residue is calcined, cooled, soaked in hydrogen peroxide, filtered, and the obtained filter residue is mixed with potassium permanganate solution and platinum-titanium catalyst, and kept warm After distillation, trimethylsilanol is then added, followed by thermal distillation, and the distillation residue is collected, rinsed, dried, and pulverized to obtain a molten steel thermal insulation matrix, which is then mixed and ground with calcium oxide and other substances. Composite molten steel thermal insulation agent can be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First, according to the solid-liquid ratio of 1:3, put the blast furnace slag and the hydrochloric acid solution with a mass fraction of 5% into the container, stir at 100r / min for 15min, then let it stand for 50min, remove the floating impurities, then filter, put the filter residue put into a calciner, calcined at 840°C for 56min, cooled to 240°C with the furnace, took out the calcined product and soaked it in 20% hydrogen peroxide solution, and placed it at 20°C for 2 hours; Filter, put the filter residue and the mass fraction of 0.3% potassium permanganate solution in a mass ratio of 1:2, put them in the distillation device, use a mass fraction of 15% sodium hydroxide solution to adjust the pH to 8.0, and then add the mass fraction of the filter residue 0.3% platinum-titanium catalyst, set the temperature at 135°C, heat-retaining reaction distillation for 6 hours; after the above-mentioned reaction distillation is completed, cool down to 84°C, add trimethylsilanol wi...

example 2

[0020] First, according to the solid-liquid ratio of 1:2, put the blast furnace slag and the hydrochloric acid solution with a mass fraction of 5% into the container, stir at 100r / min for 10min, then let it stand for 40min, remove the floating impurities, then filter, put the filter residue in put into a calciner, calcined at 780°C for 48min, cooled to 200°C with the furnace, took out the calcined product and soaked it in 20% hydrogen peroxide solution, and placed it at 15°C for 1 hour; Filter, put the filter residue and the mass fraction of 0.3% potassium permanganate solution in a mass ratio of 1:2, put them into the distillation device, use a mass fraction of 15% sodium hydroxide solution to adjust the pH to 7.5, and then add the mass fraction of the filter residue 0.2% platinum-titanium catalyst, set the temperature at 120°C, heat-retaining reaction distillation for 4 hours; after the above-mentioned reaction distillation is completed, lower the temperature to 78°C, add tri...

example 3

[0023] First, according to the solid-liquid ratio of 1:2, put the blast furnace slag and the hydrochloric acid solution with a mass fraction of 5% into the container, stir at a speed of 100r / min for 12min, then let it stand for 45min, remove the floating impurities, then filter, put the filter residue put into the calciner, calcined at 800°C for 52min, cooled to 220°C with the furnace, took out the calcined product and soaked it in 20% hydrogen peroxide solution, and placed it at 17°C for 2h; Filter, put the filter residue and the mass fraction of 0.3% potassium permanganate solution in a mass ratio of 1:2, put them in the distillation device, use a mass fraction of 15% sodium hydroxide solution to adjust the pH to 8.0, and then add the mass fraction of the filter residue 0.25% platinum-titanium catalyst, set the temperature at 125°C, heat-retaining reaction distillation for 5 hours; after the above-mentioned reaction distillation is completed, cool down to 82°C, add trimethyls...

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Abstract

The invention relates to a method for preparing a composite molten steel heat preservation agent based on blast furnace slag and belongs to the technical field of heat preservation agent preparation. The method includes the steps that firstly, the blast furnace slag and hydrochloric acid are stirred and mixed; after impurities are removed, the obtained filter residues are calcined and cooled, and then the obtained filter residues are soaked in hydrogen peroxide and filtered; the obtained filter slag is mixed with a potassium permanganate solution and a platinum-titanium catalyst; after heat preservation and distillation are conducted, trimethyl silanol is added, and then heat preservation and distillation are conducted; distillation residues are collected, washed, dried and smashed, and a molten steel heat preservation substrate can be obtained; and finally the molten steel heat preservation substrate, calcium oxide and other matter are mixed and milled, and the composite molten steel heat preservation agent can be obtained. The composite molten steel heat preservation agent prepared through the method is good in spreadability, and the spreadability is larger than 94%; the composite molten steel heat preservation agent does not react with compositions in molten steel, the heat preservation effect is good, and the motel steel temperature drop is smaller than 0.2 DEG C / min; and the specific gravity is small, no molten steel spatters in the adding process, no dust flies around, and the environment is protected.

Description

technical field [0001] The invention relates to a method for preparing a composite molten steel heat preservation agent based on blast furnace slag, and belongs to the technical field of heat preservation agent preparation. Background technique [0002] In the process of steelmaking production, the proper temperature of molten steel is a necessary condition to ensure the smooth casting of molten steel into qualified billets. In order to avoid the molten steel in the ladle being directly exposed to the air, causing the temperature of molten steel to drop too quickly during the casting process, it must be completed after the refining of molten steel It can be used to add a certain amount of molten steel heat preservation agent to the surface of molten steel before casting in the casting machine for heat preservation. The heat preservation effect of the heat preservation agent has a great influence on the quality of the billet. [0003] The molten steel insulation agents used b...

Claims

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Application Information

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IPC IPC(8): C21B3/04C21C7/00B22D11/111
CPCB22D11/111C21B3/04C21B2200/00C21C7/00Y02P10/20Y02W30/50
Inventor 郭迎庆薛培龙宋奇
Owner 郭迎庆
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