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Method for preparing protecting residue from recovery refining slag

A technology of refining slag and mold slag, which is applied in the field of recovering refining slag to prepare mold slag, which can solve the problems that the chemical composition cannot be fully utilized, the thermal conductivity of the mixture is large, and the production cannot be carried out, so as to reduce the energy consumption of the preparation and reduce the dust. Pollution, cost-saving effect

Inactive Publication Date: 2009-05-20
JIANGSU JIANAI HIGH TEMPERATURE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical composition (Basic tundish flux composition) of the basic tundish solvent disclosed in U.S. Patent US6179895B1 only limits the chemical composition of the basic tundish solvent and illustrates that it is a mixture of various raw materials, although there are also It includes recycled refining slag, but if the recycled refining slag is directly mixed with other raw materials and added to the surface of molten steel, it will also cause the recycled refining slag and molten steel to mix and slag, and the P, S and other impurities in the recovered refining slag will pollute molten steel; secondly, the heat transfer coefficient of the mixture is large, the thermal insulation function is poor, and it is easy to crust, so that the production cannot be carried out.
[0010] Therefore, till the time of applying for a patent, although people knew the chemical composition of reclaimed refining slag, and knew its use value, because they could not find an effective utilization method, they could only mix it into other slags and make some low-value utilizations, and they could not Give full play to its chemical composition and mineral response

Method used

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  • Method for preparing protecting residue from recovery refining slag
  • Method for preparing protecting residue from recovery refining slag
  • Method for preparing protecting residue from recovery refining slag

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1: Preparation of tundish mold flux, the ingredients are shown in Table 3-1. The reclaimed refined slag recovered from the steel mill after natural cooling is magnetically separated to remove iron, and the sieved material is sieved with a 100-mesh sieve. The analysis components are shown in Table 3-2, which are basically the same as those required for the tundish mold slag. Need to add suspending agent, binding agent, spray granulation. Get under the sieve and reclaim refined slag powder 94.3wt%, sodium butyl xanthate (C 4 h 9 OCSSNa) 1.5wt%, cornstarch 4.2wt%, mix the above raw materials, add water to make a slurry with a solid content of 55.56wt%, adopt automatic frequency conversion temperature control hot air stove, control the temperature of the hot air at the top of the tower at about 570 ° C, and spray Granulate.

[0030] Table 3-1 Tundish Mold Flux Composition (wt%)

[0031] CaO SiO2 MgO Al2O3 FeO CaF2 P S 45.83 6.32 8.11 ...

Embodiment 2

[0034] Example 2: Preparation of continuous casting mold flux, the composition is shown in Table 4-1. The reclaimed refined slag recovered from the steel mill after natural cooling, iron-removed by magnetic separation, sieved with a 100-mesh sieve to get the undersize, the analysis components are shown in Table 4-2. Add suspending agent, binder, deflocculating agent, water reducing agent according to the principle of making up the gap, and make slurry and spray granulate. Get under the sieve and reclaim refining slag powder 74.8wt%, sodium butyl xanthate (C 4 h 9 OCSSNa) 2.0wt%, calcium lignosulfonate 0.5wt%, boric acid 1.2wt%, cornstarch 3.3wt%, wollastonite 5wt%, waste glass 12wt%, soda ash 1.2wt% (additional raw material also all gets 100 mesh sieves Bottom), the above raw materials are mixed, and water is added to make a slurry with a solid content of 52.63wt%, and an automatic frequency conversion temperature-controlled hot blast furnace is used to control the temperatu...

Embodiment 3

[0039] Example 3: Preparation of heat preservation agent for ladle, the ingredients are shown in Table 5-1. The reclaimed refined slag recovered from the steel mill after natural cooling is magnetically separated to remove iron, sieved with a 100-mesh sieve to get the sieve, and the analysis components are shown in Table 5-2), according to the principle of filling up the gap, adding a suspending agent, combining agent, anti-flocculant, slurry spray granulation. Get under the sieve and reclaim refined slag powder 71.9wt%, sodium butyl xanthate (C 4 h 9 OCSSNa) 1.3wt%, cornstarch 3.8wt%, vermiculite 8%, coke powder 15wt% (additional raw materials also all get 100 mesh sieves), above-mentioned raw materials are mixed, add water and make the slurry of solid content 68.08wt% The material is sprayed and granulated by using an automatic frequency conversion temperature-controlled hot air stove to control the temperature of the hot air at the top of the tower at about 550 °C. C+R2O...

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Abstract

The invention relates to a method for preparing protecting slag from recovered refining slag remained in a ladle after continuous casting, which is characterized in that the recovered refining slag is natural cooled down, pulverized, subjected to iron removal and passes a 80-mesh screen; undersize is picked up and subjected to component analysis; according to the target component of the prepared protecting slag, if corresponding amount of natural mineral or fine powder of manually synthesized material containing the lacked components needs to be added, butane radical sodium xanthate and balling bonding agent in the general adding amount are added to prepare pulp with the solid content of between 50 and 70 weight percent, and the pulp is sprayed at the tower top at a hot air temperature of between 550 and 650 DEG C to prepare hollow micro balls. The invention has two characteristics: 1. the method has the simple recycling process, and the materials used to prepared the protecting slag are calculated and added only by the principle of adding what lacks and adding how much lacks, so that the component requirement on the protecting slag preparation is met; and 2. due to high added value of the product, the value of the recovered refining slag can be fully utilized.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of iron and steel metallurgical slag, in particular to a method for preparing mold slag from recovered refining slag remaining in a ladle after continuous casting. Background technique [0002] In each process of iron and steel metallurgy, such as sintering, ironmaking, converter, electric furnace, refining, etc., various slag materials must be added, such as mold slag for continuous casting crystallization, tundish mold slag, ladle insulation agent, mold casting Insulation agents, etc., to complete their respective metallurgical goals. These slags are used to form corresponding metallurgical slags, such as blast furnace slag, converter slag, electric furnace slag, recycled refining slag and non-ferrous metallurgical slag. According to my country’s current annual production of 500 million tons of steel, more than 100 million tons of metallurgical slag are produced every year. . These meta...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 吴永来谢健尹玉服汤致魁杨政宏李杰黄峰张兴华
Owner JIANGSU JIANAI HIGH TEMPERATURE MATERIAL
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