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A method for solid-phase oxidation modification of converter steel slag

A technology of converter steel slag and solid phase oxidation, which is applied in the field of metallurgy, can solve the problem of low concentrate yield, achieve the effects of improving efficiency and income, avoiding environmental pollution and resource waste, and promoting sustainable development

Active Publication Date: 2020-04-07
BEIFANG UNIV OF NATITIES
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Problems solved by technology

Raw ore fine powder with a particle size of <0.3mm occupies a very large proportion (up to 55.56%) in steel slag. However, due to the low content of magnetic mineral phase in this part of steel slag, the concentrate yield is only 11.65%.

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  • A method for solid-phase oxidation modification of converter steel slag
  • A method for solid-phase oxidation modification of converter steel slag
  • A method for solid-phase oxidation modification of converter steel slag

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Embodiment Construction

[0022] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] 1. Thermodynamic prediction

[0024] Before the experiment, the thermodynamic calculation of the solid-phase modification process of industrial steel slag was carried out ( figure 2 ), referring to the actual chemical composition and solid-phase modification process of industrial steel slag, using FactSage 7.0 to calculate the equilibrium products at different temperatures during the calcination process of steel slag powder, the main parameters of FactSage are set as follows: temperature range 700 ° C ~ 1500 ° C; The total ambient pressure is 1 atm, the oxygen partial pressure is 0.21 atm, and the calculation database is FToxid-SLAGA, FToxid-SPINA, FToxid-MeO-A, FToxid-aC2S, FToxid-Mel.

[0025] From the results of thermodynamic calculations, it can be seen that the temperature range for the formatio...

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Abstract

The invention discloses a solid-phase oxidation modification method for converter steel slag. The method comprises the following steps: weighing 50g of raw steel slag and loosely filling a remaking alumina crucible with a volume of 100mL with the raw steel slag; placing the remaking alumina crucible in a high-temperature box-type muffle furnace; charging N2 into the furnace to guarantee no air existing in the muffle furnace at first before an experiment; setting a heating speed to be 10 DEG C / min; when a temperature reaches 1100 DEG C, replacing N2 with synthetic air; monitoring the charging amount of the synthetic air through an LZB glass rotameter; adjusting the charging amount of air to be 7.5L / min; and after a set oxidation time reaches 40min, replacing the synthetic air with the N2 and rapidly cooling to reach room temperature. According to the method, fine steel slag powder with a particle size of less than 0.3mm is taken as a main research target; a manner of calcining in an oxidizing atmosphere is adopted for completing the transformation of aggregation of non-magnetic ferrous oxide and magnesium oxide in raw steel slag ores towards a magnetic iron rich phase; and an oxidation modification result is evaluated through magnetic separation.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a solid-phase oxidation modification method for converter steel slag. Background technique [0002] Due to the difference in the grindability of the mineral phases inside the converter steel slag, the steel slag particles can be divided into three categories according to the particle size after jaw crushing and grinding: particle size > 2.36mm, particle size between 0.3mm-2.36mm and Particle size <0.3mm. The steel slag with a particle size > 2.36 mm can be directly used for smelting in the furnace after magnetic separation, while the tailings need to be further ground. The magnetic separation concentrate of steel slag with a particle size between 0.3mm and 2.36mm can be returned to the furnace for smelting, and the remaining tailings of magnetic separation are ground again. The above two parts of magnetic separation tailings are collected and ground to a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21B3/06
CPCC21B3/06C21C5/36Y02W30/50
Inventor 蒋亮陈宇红李涌泉韩凤兰董福元李宁
Owner BEIFANG UNIV OF NATITIES
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