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Preparation method and use method of quick-dissolving lime for converter slag

A converter slag and lime technology, which is applied in the field of quick-dissolving lime preparation for converter slag, can solve problems such as co-solvent environmental pollution and increase steelmaking costs, and achieve the effects of accelerated dissolution, fast dissolution rate, and small grain size

Active Publication Date: 2020-12-01
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, Hamano et al. studied by adding co-solvent CaF 2 , CaCl 2 , B 2 o 3 、Al 2 o 3 etc. to reduce the melting point of lime and promote lime dissolution, but the use of co-solvents will not only increase the cost of steelmaking, but also some co-solvents will cause environmental pollution problems

Method used

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  • Preparation method and use method of quick-dissolving lime for converter slag
  • Preparation method and use method of quick-dissolving lime for converter slag
  • Preparation method and use method of quick-dissolving lime for converter slag

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Effect test

Embodiment 1

[0025] A kind of converter slag of the present embodiment is used for the quick dissolving lime preparation method, in order to obtain this lime, its experimental preparation condition is carried out on the induction furnace of 200kg, and its process is: at first screening the limestone that size is 6cm, makes it in the muffle furnace For calcination, after the material is put into the muffle furnace, it is heated at a heating rate of 6-10°C / min. After the temperature of the muffle furnace reaches 950°C, the calcination temperature is controlled to be 950°C, and the calcination time is controlled to be 2.5h, which is worth It is explained that during the entire calcination process, protection is carried out under the atmosphere of argon. In addition to protection, the important role of argon is to convert the generated CO 2 The gas is discharged, so that during the calcination process CO 2 The partial pressure is always low, which is conducive to the decomposition of limestone...

Embodiment 2

[0040]A kind of method for preparing converter slag of the present embodiment with fast dissolving lime is basically the same as that of embodiment 1, and its difference is that the process is: firstly, the limestone with a size of 4 cm is screened, and it is calcined in a muffle furnace, and then heated in argon. Under the protective atmosphere of gas, the calcination temperature is controlled to be 1000°C, and the calcination time is controlled to be 2h, and then it is cooled and sealed for later use, so as to obtain the required lime.

[0041] The prepared lime was sampled and tested, and the specific parameters of the lime are shown in Table 1.

[0042] A method of quickly dissolving lime for converter slag in this embodiment, first, take 100 kg of industrial pig iron and 10 kg of converter decarburization slag on a silicon molybdenum rod and heat it to 1400 ° C to fully melt the slag, and keep it warm for 30 minutes. The relevant parameters of the converter slag are shown...

Embodiment 3

[0047] A kind of method for preparing converter slag of the present embodiment with fast dissolving lime is basically the same as in embodiment 1, and its difference is that the process is: at first screening the limestone with a size of 7 cm, making it calcined in a muffle furnace, Under the protective atmosphere of gas, the calcination temperature is controlled to be 1100°C, and the calcination time is controlled to be 1.8h, and then it is cooled and sealed for later use, so as to obtain the required lime.

[0048] The prepared lime was sampled and tested, and the specific parameters of the lime are shown in Table 1.

[0049] A method of quickly dissolving lime for converter slag in this embodiment, first, take 100 kg of industrial pig iron and 10 kg of converter decarburization slag on a silicon molybdenum rod and heat it to 1400 ° C to fully melt the slag, and keep it warm for 30 minutes. The relevant parameters of the converter slag are shown in Table 2. After being kept...

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Abstract

The invention discloses a preparation method and a use method of quick-dissolving lime for converter slag, belonging to the technical field of converter steelmaking. Limestone is calcined at a calcining temperature of 950 DEG C to 1200 DEG C for 0.5 h to 2.5 h so as to obtain the desired lime, wherein the lime contains a part of limestone; namely, the physical structure and the chemical composition of an end product are changed. In the using process of the lime, the limestone in slag is decomposed to generate gas, and the gas diffuses outwards from the interior of the lime, so the lime is rapidly decomposed; a cosolvent does not need to be added in the whole process; and meanwhile, a steelmaking dephosphorization reaction rate is increased, the content of free calcium oxide in the slag isreduced, and comprehensive reutilization of the slag is promoted.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, more specifically, to a method for preparing fast-dissolving lime for converter slag and a method for using the same. Background technique [0002] Lime is one of the main slag-forming materials for converter steelmaking, and its rapid and sufficient dissolution plays a vital role in improving the dephosphorization reaction rate of steelmaking. However, in the actual steelmaking process, affected by various factors, some lime in the steelmaking slag is not fully dissolved, thus affecting the dephosphorization efficiency. As my country's iron and steel enterprises continue to reduce excess production capacity, more converters in my country will be produced using the "double slag + slag" or converter dual process in the future. The key to the "double slag + residual slag" or converter dual process is to use Low temperature achieves high-efficiency dephosphorization, and the rapid and ...

Claims

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Application Information

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IPC IPC(8): C04B2/10C21C7/076
CPCC21C7/076C04B2/10Y02P10/20
Inventor 夏云进范鼎东李杰孙桂林陶素芬曹彦博
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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