Internal recycling method for KR desulfurized slag steel mill

An internal circulation, desulfurization slag technology, applied in chemical instruments and methods, sulfur compounds, process efficiency improvement, etc., can solve the problems of long treatment process, insufficient use of desulfurization slag value, etc., to achieve good fluidity and reduce slag. Consume, speed up the effect of the reaction rate

Pending Publication Date: 2021-09-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the method provided by this patent can realize the cascade application of valuable metals in KR desulfurization slag and desulfurization slag to a certain extent, it uses the tailing slag instead of quicklime for sintering dry or semi-dry desulfurization process, and then The product replaces sintered iron-containing raw materials and flux, not only the overall treatment process is longer, but also the value of desulfurization slag with CaO and iron as the main components is not fully utilized

Method used

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  • Internal recycling method for KR desulfurized slag steel mill
  • Internal recycling method for KR desulfurized slag steel mill
  • Internal recycling method for KR desulfurized slag steel mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a kind of KR desulfurization slag (42.88% CaO, 11.74% SiO 2 , 3.29% MgO, 1.58% S, 3.80% CaF 2 and 36.71% MFe) the method for internal recycling in steel mills, comprising the steps:

[0038] S1. Crush the KR desulfurization slag into particles with a particle size of 10-15mm, and then perform magnetic separation to obtain slag-iron and tailings; wherein, the mass ratio of slag-iron to tailings is 0.48:1.

[0039] The iron content in the collected iron slag is 75%, which can be used to replace part of the steelmaking raw materials for steelmaking; the CaO content in the tailing slag is 63.29%, the iron content is 6.58%, and the sulfur content is 1.77%. Next step.

[0040] S2. Under an oxidizing atmosphere (oxygen partial pressure is 0.4atm), heat the tailings obtained in step S1 to 1300° C. and keep it warm for 30 minutes to perform oxidative desulfurization to obtain sulfur-containing flue gas and pre-melted slag.

[0041]Among them, the desu...

Embodiment 2～5 and comparative example 1～4

[0045] Embodiments 2 to 5 and Comparative Examples 1 to 4 respectively provide a method for internal recycling of KR desulfurization slag in a steel plant. Compared with Example 1, the difference is that the broken particle size of KR desulfurization slag or high temperature oxidation is changed. The technical parameters of the process, the corresponding technical parameters of each embodiment and comparative example are shown in Table 1, and the rest of the steps are consistent with the embodiment 1, and will not be repeated here.

[0046] The process parameter of table 1 embodiment 2~5 and comparative example 1~4

[0047]

[0048] After testing, the desulfurization rates of the methods provided in the examples and comparative examples in the oxidative desulfurization process and the semi-steel dephosphorization rates and semi-steel sulfur additions of the products used in the early slagging of converters are shown in Table 2.

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Abstract

The invention provides an internal recycling method for KR desulfurized slag in a steel mill. The internal recycling method comprises the following steps that KR desulfurized slag is crushed, and then subjected to magnetic separation to obtain slag iron and tailings; then, the tailings are subjected to high-temperature oxidation treatment, and sulfur-containing flue gas and pre-melted slag are obtained; and then sulfur-containing flue gas is collected and treated, the pre-melted slag is used as a slagging material for converter early-stage slagging, and internal recycling of the KR desulfurized slag in the steel mill is achieved. Through the manner, the slag iron in the KR desulfurized slag can be effectively separated from the tailings which are difficult to recycle, and the tailings are subjected to high-temperature oxidation treatment, so that the iron in the tailings is oxidized into iron oxide while sufficient desulfurization is performed, and the sulfur-free pre-melted slag rich in CaO and iron oxide is obtained; and further, by utilizing the synergistic effect between the CaO and the iron oxide, the pre-melted slag is used as a slagging material for converter early-stage slagging, so that the iron oxide promotes quick dissolution of lime, and the slagging pressure of converter steelmaking is reduced while comprehensive utilization of the KR desulfurized slag is realized.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of KR desulfurization slag, in particular to a method for internal recycling of KR desulfurization slag in a steel plant. Background technique [0002] KR molten iron pretreatment desulfurization slag (referred to as KR desulfurization slag) is the high alkalinity and reducing slag produced after molten iron pretreatment-KR desulfurization, and the production amount is generally about 10kg / t molten iron. KR desulfurization slag mainly consists of CaO and MFe, contains about 2% sulfur, and exists in the form of CaS. With the development of the national economy, the production requirements of low-sulfur steel and ultra-low-sulfur steel increase year by year, and the production of KR desulfurization slag also increases accordingly. At present, the treatment of KR desulfurization slag has brought pressure to the development of iron and steel enterprises, and it is necessary to study...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C5/36C01B17/74
CPCC21C1/02C21C5/36C01B17/74Y02P10/20
Inventor 李建立朱仁林余岳朱航宇薛正良
Owner WUHAN UNIV OF SCI & TECH
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