Efficient environment-friendly KR desulfurizing agent and preparation method thereof

An environmentally friendly, desulfurizing agent technology, applied in the direction of improving process efficiency, can solve the problems of reducing the ability of the converter to digest scrap steel, endangering human health, and large temperature drop of molten iron, so as to shorten the desulfurization treatment time, improve the fluidity of slag, The effect of reducing the temperature drop of molten iron

Active Publication Date: 2020-07-14
鞍钢实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These desulfurizers are relatively low in cost and high in desulfurization efficiency, but they also show shortcomings in varying degrees, which are summarized as follows: ① Granular lime CaO desulfurizers are added in a large amount, the treatment time is long, and the amount of slag is large and it is difficult to remove slag; ②, ③ Two kinds Desulfurizer, because adding fluorite CaF 2 , which increases the fluidity of slag and further improves the desulfurization efficiency, but the desulfurized slag after desulfurization needs to be treated with water so that F- enters the water, which seriously pollutes the environment and endangers human health; ④The desulfurizers are mostly in the form of granular powder, which is greatly lost due to the rise of the hot air flow on the molten iron surface, and at the same time aggravates environmental pollution; ⑤The sulfur capacity of the components is relatively poor, which is not conducive to deep desulfurization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] A kind of preparation method of efficient environment-friendly type KR desulfurizer, comprises the steps:

[0030] 1) Preparation of Al-Mg-Fe alloy:

[0031] a) Proportionally weighing standard aluminum ingots, magnesium blocks, and 08Al light and thin scrap steel;

[0032] b) Divide light and thin material scrap steel and magnesium block into several equal parts respectively in step a), add one-half of light and thin material scrap steel into the hopper of scrap steel briquetting machine, and then add a part of magnesium block to light and thin material In the middle of the scrap steel, the remaining light and thin scrap steel in one portion is covered on the magnesium block, and the briquetting machine is started to briquetting, and the remaining light and thin scrap steel and magnesium blocks are all pressed into blocks in this way;

[0033] c) Put the raw materials into the medium-frequency induction furnace for melting according to the following standards. The ord...

Embodiment 1

[0040] A kind of preparation method of efficient environment-friendly type KR desulfurizer, comprises the steps:

[0041] 1) The preparation method of Al-Mg-Fe alloy:

[0042] a) Proportionally weighing standard aluminum ingot (Al99.7%), magnesium block (Mg99.95%), and 08Al light and thin scrap steel;

[0043] b) Divide light and thin material scrap steel and magnesium block in a) into four equal parts respectively, add one-half of 08Al light and thin material scrap steel into the trough of scrap steel briquetting machine, and then add a part of magnesium block to the scrap steel In the middle, the remaining light and thin scrap steel in one part is covered on the top of the magnesium block, and the operation button of the briquetting machine is activated to carry out briquetting, and finally all are pressed into four pieces;

[0044] c) Put the raw materials into the medium-frequency induction furnace for melting according to the following standards, and the order of feeding...

Embodiment 2

[0060] The preparation method of the high-efficiency and environment-friendly KR desulfurizer of this embodiment is the same as that of Example 1; the composition content of this embodiment is as follows:

[0061] Al-Mg-Fe alloy grains, Al 51.85wt%, Mg 7.51wt%, Fe 40.12wt%; particle size 3-5mm; weight parts of Al-Mg-Fe alloy grains in the desulfurizer is 9 parts;

[0062] Active lime powder, CaO 89.5wt%, SiO 2 2.17wt%, S 0.045wt%, activity degree 321 (ml), particle size≤3mm; the parts by weight of active lime powder in the desulfurizer is 84 parts;

[0063] In limestone powder, CaCO 3 96.95wt%, SiO 2 1.58wt%, MgO 1.34wt%; particle size≤mm; the parts by weight of limestone powder in the desulfurizer is 1.2 parts;

[0064] In reduced metal calcium slag, CaO 51.06wt%, Al 2 o 3 47.32wt%, remaining impurities, reduced metal calcium slag particle size 200 mesh; the parts by weight of reduced metal calcium slag in the desulfurizer is 4.3 parts;

[0065] In powdered sodium s...

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Abstract

The invention discloses an efficient environment-friendly KR desulfurizing agent and a preparation method thereof. The efficient environment-friendly KR desulfurizing agent comprises the following rawmaterials of, in parts by weight, 5-15 parts of aluminum-magnesium-iron alloy, 74-84 parts of active lime powder, 1-6 parts of limestone powder, 3-6 parts of reduced metal calcium slag and 1-3 partsof powdery sodium silicate. Compared with the prior art, the efficient environment-friendly KR desulfurizing agent and the preparation method thereof have the beneficial effects that the desulfurizingagent has no smoke dust, does not pollute the environment and has higher sulfur capacity when in use, and the components in the desulfurizing agent can ensure stronger reducing atmosphere, so that the desulfuration is more thorough, and the desulfurizing agent is beneficial to the low-sulfur smelting of high-quality steel.

Description

technical field [0001] The invention relates to an auxiliary material used in the molten iron pretreatment process, in particular to an efficient and environment-friendly KR desulfurizer and a preparation method thereof. Background technique [0002] With the depletion of iron and steel raw materials and fuels, and the gradual reduction of low-phosphorus, low-sulfur and other high-grade low-impurity iron ores, high-phosphorus and high-sulfur iron ores will surely enter a stage of mass use. In addition, high-quality steel has increasingly strict requirements on sulfur content. Therefore, how to achieve effective desulfurization and produce high-quality low-sulfur steel has become one of the major issues faced by metallurgists. In the traditional converter steelmaking method, due to the high temperature and high oxidation in the furnace, the desulfurization capacity of the converter is limited. The thermodynamic conditions of desulfurization in molten iron before entering the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02
CPCC21C7/0645C21C1/025Y02P10/20
Inventor 李学慧梁荣山刘梦野王汝家佟伟
Owner 鞍钢实业集团有限公司
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