Method for smelting medium- and low-carbon ferrochromium by introducing one-step method of carbon dioxide converter

A technology of low-carbon ferrochromium and carbon dioxide, applied in the manufacture of converters, etc., can solve the problem of high Cr loss in low-carbon ferrochromium, and achieve the effect of reducing process costs

Active Publication Date: 2015-01-21
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0005] The purpose of the present invention is to propose a method of introducing carbon dioxide converter one-step smelting of low-carbon ferrochrome to solve the problem of high Cr loss of low-carbon ferrochrome in traditional converter smelting

Method used

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Embodiment 1

[0042] A method for introducing a carbon dioxide converter to smelt low-carbon ferrochrome in one step, comprising the steps of:

[0043] (1) Continuous production of high-carbon ferrochrome by submerged arc furnace:

[0044] (1.1) Preparation and addition of raw materials in the submerged arc furnace: the raw materials are mixed in the order of coke-silica-chrome ore, and new materials are continuously added as the furnace charge decreases to ensure that the height of the material surface remains unchanged;

[0045] (1.2) Smelting: the temperature of the smelting is 1670°C, and the electric arc of the submerged arc furnace is used for heating;

[0046] (1.3) Tapping: the tapping interval is 2.0h, and the slag and iron are released from the tap hole at the same time, and the duration of each tapping is 8 minutes;

[0047] (1.4) Blocking: After tapping, ball mud made of magnesia powder and refractory clay is used to block the holes;

[0048] The iron-tapped product is high-ca...

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Abstract

The invention discloses a method for smelting medium-carbon and low-carbon ferrochromium by introducing a one-step method of a carbon dioxide converter and belongs to the field of metallurgy. The method comprises the following steps: (1) continuously producing high-ferrochromium by using a submerged arc furnace; (2) introducing a CO2 converter to produce medium-carbon and low-carbon ferrochromium; and (3) producing a medium-carbon and low-carbon ferrochromium product. The service life of a fireproof furnace liner is prolonged by introducing the CO2 converter to produce medium-carbon and low-carbon ferrochromium, chromium is prevented from being oxidized during decarburization, the recovery rate of chromium is improved, the grade of converter gas is improved and the smelting cost is lowered.

Description

technical field [0001] The invention relates to the field of ferroalloy smelting, in particular to a method for introducing carbon dioxide into a converter to smelt low-carbon ferrochrome in one step. Background technique [0002] At present, there are three main methods for smelting medium and low carbon ferrochromium: cold charging method, electric furnace-shaking bag method and oxygen blowing method. Among them, the cold charging method is to add chromium ore, silicon-chromium alloy and lime into the electric furnace to melt the charge, and use the silicon in the silicon-chromium alloy to reduce the Cr in the chromium ore. 2 o 3 , to produce medium and low carbon ferrochrome through desiliconization and chromium increase reaction. This method has high power consumption and serious loss. The electric furnace-shaking bag method is to produce medium and low carbon ferrochrome by desiliconizing and chromium-increasing the silicon-chromium alloy smelted in the submerged arc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C22B4/06
Inventor 王海娟郁鸿超韩培伟
Owner UNIV OF SCI & TECH BEIJING
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