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Method for recovering iron resources in steel slag

A steel slag and resource technology, applied in the direction of iron oxides, chemical instruments and methods, iron compounds, etc., can solve the problem of low recovery efficiency, achieve the effect of improving iron grade, increasing yield, and reducing the amount of steel slag

Active Publication Date: 2018-11-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the survey, the current recovery of iron resources in steel slag mainly focuses on the partial reduction of metallic iron or iron oxides, and the recovery efficiency is low. At present, the focus is on the development of new processes for the separation and recovery of valuable metal elements, and selective enrichment and separation through recrystallization technology metal resources

Method used

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  • Method for recovering iron resources in steel slag

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Effect test

Embodiment 1

[0021] In this embodiment, steel slag with a mass of 20 g is selected. The content of each component in steel slag is shown in Table 1. Among them, CaO is 8g; SiO 2 4g; FeO 4g; MgO 2g; MnO 1g; Al 2 o 3 1g.

[0022] Select 20g of steel slag to keep melting at 1600°C, spray water vapor on the surface of the molten steel slag as an oxidizing gas for more than 2 hours, and oxidize FeO in the steel slag; the temperature of the steel slag after the reaction is lowered to 1200°C, and it is kept for 3 hours; the steel slag after heat preservation is rapidly Cooling, the cooling rate of the steel slag is 100°C / min; the cooled steel slag is crushed, the particle size is below 200 mesh, and the magnetic field strength is 200mT for magnetic separation. The magnetic separation product was dried to obtain 6.721 g of the magnetic phase, and it was determined by XRF and XRD detection that Fe in the recovered magnetic phase was mainly Fe 3 o 4 and MgFe 2 o 4 exists, the grade of iron i...

Embodiment 2

[0029] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0030] CaO content 36%, SiO 2 content 24%, FeO content 25%, MgO content 6%, MnO content 5%, Al 2 o 3 Take 20g of steel slag with a content of 5% and keep it melted at 1600°C, then spray water vapor on the surface of the molten steel slag as an oxidizing gas for more than 2 hours to oxidize FeO in the steel slag; after the reaction, the temperature of the steel slag is lowered to 1300°C and kept for 4 hours; The steel slag after heat preservation is cooled rapidly, and the cooling rate of the steel slag is 200°C / min; the cooled steel slag is crushed, and the particle size is below 200 mesh, and the magnetic field strength is 200mT for magnetic separation. The magnetic separation product was dried to obtain 5.990 g of the magnetic phase, and it was determined by XRF and XRD detection that Fe in the recovered magnetic phase was mainly Fe 3 o 4 and MgFe 2 o 4 exists, the grade of iron is 25.9%, a...

Embodiment 3

[0032] Embodiment 3 is basically the same as Embodiment 1, the difference is:

[0033] CaO content 38%, SiO 2 content 22%, FeO content 22%, MgO content 8%, MnO content 5%, Al 2 o 3 Take 20g of steel slag with a content of 5% and keep it melted at 1600°C, then spray water vapor on the surface of the molten steel slag as an oxidizing gas for more than 2 hours to oxidize FeO in the steel slag; after the reaction, the temperature of the steel slag is lowered to 1400°C and kept for 5 hours; The steel slag after heat preservation is rapidly cooled, and the cooling rate of the steel slag is 300°C / min; the cooled steel slag is crushed, and the particle size is below 200 mesh, and the magnetic field strength is 200mT for magnetic separation. The magnetic separation product was dried to obtain 5.639 g of the magnetic phase, and it was determined by XRF and XRD detection that Fe in the recovered magnetic phase was mainly composed of Fe 3 o 4 and MgFe 2 o 4 exists, the grade of iron...

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Abstract

The invention provides a method for recovering iron resources in steel slag. The method comprises the following steps that 1, the steel slag is subjected to melting operation; adjustable and controllable oxidizing gas is sued and is sprayed and blown to the liquid surface of the steel slag; FeO in the steel slag is oxidized; 2, the reacted steel slag is subjected to temperature reduction operation; after the temperature is stable, heat insulation is performed; 3, the steel slag after the heat insulation is cooled. After the steps, a finally generated MgFe2O4 spinel phase and Fe3O4 are major iron containing phases in the used steel slag. Through the treatment steps provided by the invention, (1) the iron grade in the steel slag after magnetic separation is obviously improved; the steel slagcan be used as iron ore resources for steel and iron production; (2) compared with a common steel slag iron resource recovery treatment method at preset, the method has the advantage that the yield of iron in the steel slag is greatly improved; (3) the steel slag quantity of the aftertreatment is obviously reduced; the effect of steel slag solid waste reduction is achieved.

Description

technical field [0001] The invention relates to the field of metallurgy and solid waste treatment, in particular to a method for recovering iron resources in steel slag, not particularly for converter steel slag with a certain fixed alkalinity, FeO content and specific holding temperature. Background technique [0002] The output of my country's iron and steel industry is huge. As the solid waste discharged in the process of iron and steel production, about 120kg of steel slag is discharged for every ton of steel produced. According to the statistics of the world's steel industry, the total output of crude steel in the country in 2017 was 832 million tons, and behind the huge crude steel data came the problem of steel slag disposal. Since many steel mills in my country adopt a relatively simple "crushing-screening-magnetic separation" method, only the metal iron particles in it are recovered, and the remaining steel slag tailings are mostly dumped or backfilled, which not on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08C01G49/00
CPCC01G49/00C01G49/08
Inventor 胡晓军李志刚胡小杰孙恒郭占成周国治
Owner UNIV OF SCI & TECH BEIJING