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Defoaming method for converter double-slag smelting steel slag

A technology of defoaming and foaming, applied in the manufacture of converters, etc., can solve the problems of increasing consumption of steel materials, affecting slag dumping time, inclusion of iron beads, etc., to achieve the goal of reducing consumption of steel materials, reducing metal content, and reducing metal loss Effect

Inactive Publication Date: 2021-08-20
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The foamy slag makes the slag thicker, and the slag is poured after about 5 minutes of blowing. Due to the short smelting time, and in order to prolong the retention time of the foamy slag as much as possible, the furnace position may be caused during the slag pouring process of the converter. Higher, even a large number of iron beads are mixed in it, which affects the time of slag dumping and increases the consumption of steel materials

Method used

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Embodiment Construction

[0012] In order to understand the above aspects, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with specific embodiments.

[0013] A method for defoaming steel slag from converter double slag smelting, comprising:

[0014] Before the first downturn of the double slag smelting furnace, add an appropriate amount of iron oxide balls or dust-removing mortar balls into the furnace through the high-level hopper of the converter, and the weight is calculated as 4kg / t-5kg / t per ton of steel. Seconds make the added slag fully open the foam slag, form a gas discharge channel, release the gas in the foam slag, and remove the foam. After standing still for 30 seconds, start the normal furnace and slag dumping operation.

[0015] By adopting the method of the present invention, through actual operation, the foam of smelting steel slag is effectively removed in the double slag smelting process, ...

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PUM

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Abstract

The invention discloses a defoaming method for converter double-slag smelting steel slag. The defoaming method for the converter double-slag smelting steel slag comprises the following steps of: before the first-time turning down of double-slag smelting, adding a proper amount of oxide scale balls or dust removal plaster balls into a furnace through a converter overhead bunker, opening foaming slag, forming a gas discharge channel, releasing gas in the foaming slag, and defoaming. The defoaming method for the converter double-slag smelting steel slag is provided, so that the slag foaming condition of the converter double-slag process smelting for the first time of deslagging is obviously reduced; the deslagging operation time is shortened; and the metal content of the slag is reduced, the metal loss is reduced, and the steel material consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for defoaming steel slag in converter double slag smelting. Background technique [0002] Since the iron-containing ratio in the slag is basically between 15-20%, in order to reduce the formation of iron oxide into the slag from molten iron oxide and scrap steel, especially when the converter starts smelting, 20-30% of the total slag material is added to the iron-containing raw material for Make up for the consumption of iron and steel materials (cost and price are cheap), and at the same time, under the condition of certain alkalinity, temperature and slag content, improve the oxidation performance of the converter, and also improve the dephosphorization efficiency of the converter. Due to the addition of a large amount of iron-containing oxides and the oxygen stream of the high-speed jet in advance, part of [C] will be oxidized. From the experimental ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36
CPCC21C5/36C21C2005/366
Inventor 张胤唐建平麻晓光王鹏飞刁望才韩春鹏云霞
Owner BAOTOU IRON & STEEL GRP