Boron-containing fluoride-free covering slag for steel continuous-casting crystallizer and preparation method thereof

A technology for continuous casting mold and mold slag, which is applied to the field of boron-containing and fluorine-free mold slag for steel continuous casting mold and its preparation field, can solve the problems of high melting point, poor lubrication effect and high crystallization temperature, and achieves the improvement of vitrification. Performance, good use performance, cost reduction effect

Inactive Publication Date: 2011-05-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a new type of mold slag for steel continuous casting crystallizer using waste boron mud as the main base material and its preparation method, so as to solve the problems of low alkalinity, high melting point

Method used

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  • Boron-containing fluoride-free covering slag for steel continuous-casting crystallizer and preparation method thereof
  • Boron-containing fluoride-free covering slag for steel continuous-casting crystallizer and preparation method thereof
  • Boron-containing fluoride-free covering slag for steel continuous-casting crystallizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Ingredients: boron mud powder 50Kg, wollastonite powder 29Kg, lime powder 20Kg, coke powder 1Kg;

[0043] Preparation process: Mix the materials thoroughly, and use the disc method to make 0.1~0.2mm granular slag. The main composition indexes of mold flux are shown in Table 3, and the main physical and chemical performance indexes are shown in Table 4.

Embodiment 2

[0045] Ingredients: boron mud powder 55Kg, wollastonite powder 25Kg, lime powder 18Kg, coke powder 2Kg;

[0046] Preparation process: Mix the materials thoroughly, and use the disc method to make 0.1~0.2mm granular slag. The main composition indexes of mold flux are shown in Table 3, and the main physical and chemical performance indexes are shown in Table 4.

Embodiment 3

[0048] Fully dry and dehydrate boron mud powder, wollastonite powder, lime powder and coke powder at 200°C, grind them into fine powder and weigh them;

[0049] Ingredients: boron mud powder 60Kg, wollastonite powder 23Kg, lime powder 15Kg, coke powder 2Kg;

[0050] Preparation process: Mix the materials thoroughly, and use the disc method to make granular slag of 0.1~0.2mm. The main composition indicators of mold flux are shown in Table 3, and the main physical and chemical performance indicators are shown in Table 4.

[0051] Second set of examples

[0052] The selected raw materials are as follows:

[0053] The technical index of boron mud powder is: B 2 o 3 4%;

[0054] The chemical composition of wollastonite is (mass%): SiO 2 52, CaO 45, MgO 0.8, S<0.03, P<0.03, the balance of impurities.

[0055] The chemical composition of lime is (mass%): CaO 95.0, MgO 3.0, SiO 2 1.0, the rest are Al 2 o 3 and other trace impurities;

[0056] The technical indicators of...

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Abstract

The invention belongs to the technical field of steel smelting continuous casting production and in particular relates to boron-containing fluoride-free covering slag for a steel continuous-casting crystallizer and a preparation method thereof. The boron-containing fluoride-free covering slag is characterized by being prepared form the following raw materials in percentage by weight: 50-60 percent of boric sludge powder, 20-30 percent of wollastonite powder, 10-20 percent of lime powder and 1-2 percent of coke powder. The preparation method comprises the steps of: fully drying and dewatering the raw materials, weighing and burdening the raw materials according to weight fractions, levigating, uniformly mixing, and preparing the levigated materials into granular finished products of slag by adopting a traditional covering slag preparing and forming process. The covering slag has better melting property and absorption and entrapment capability, and particularly, boron is used to replacefluoride to realize the fluoride-free property of the covering slag and the recycling of the waste boric sludge, therefore, the advantages of cost reduction, environment friendliness and obvious economic and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting and continuous casting production, and in particular relates to a boron-containing and fluorine-free mold slag for a steel continuous casting crystallizer and a preparation method thereof. Background technique [0002] The continuous casting technology has been highly valued by the metallurgical industry for its advantages of high efficiency, energy saving, high quality, easy automation and intelligence, and the corresponding continuous casting mold powder has also been developed accordingly, and has become an indispensable Lack of metallurgical auxiliary materials. [0003] In the prior art, mold flux for continuous casting molds can be divided into the following three main systems according to the chemical composition of the base material: SiO 2 -Al 2 o 3 -CaO series, SiO 2 -Al 2 o 3 -FeO system, SiO 2 -Al 2 o 3 -Na 2 O system, on this basis, add a small amount of flux ...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 王宏明李桂荣赵玉涛闫永其张廷旺
Owner JIANGSU UNIV
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