A method for improving the recovery rate of iron components in steel slag

A recovery rate, steel slag technology, applied in the direction of recycling technology, chemical instruments and methods, solid separation, etc., can solve the problems of oxidative gas oxidation degree control, inconvenient on-site operation, etc., to achieve the benefits of secondary utilization, heavy metal reduction, The effect of improving the recovery rate

Active Publication Date: 2018-06-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxidation method refers to the oxidation of low-valent iron oxides into magnetic Fe by using an oxidative atmosphere at high temperature. 3 o 4 , so as to recover iron components, but excessive oxidation will cause Fe 3 o 4 Convert to Fe 2 o 3 , Oxidizing gas also has many inconveniences in the control of oxidation degree and on-site operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0046] Add 16% (mass percentage) river sand into the molten electric furnace slag, and the silicon oxide content of the river sand is 71.26%; further air-cool the evenly melted modified slag, and break some samples of the modified electric furnace slag after cooling Ball mill to below 200 mesh for magnetic separation. The test results showed that the basicity of the modified steel slag was reduced from 2.35 to 1.42, Fe 2 o 3 The ratio to the FeO content (mass percentage) is 0.81, and the recovery rate of the iron component is 60.47%.

[0047] The unmodified steel slag is recovered by conventional methods, and the recovery rate is 31.75%. The iron component is recovered after the steel slag is modified by the method, and the recovery rate of the steel slag without modification is increased by 90.40%. The ferromagnetic mineral phase of the iron component recovered in this embodiment is mainly magnetite and iron-containing spinel.

no. 2 example

[0049] Add 20% (mass percentage) iron tailings in the molten electric furnace slag, and the SiO2+Fe2O3 content of the iron tailings is 79.90%; further air-cool the modified molten slag, and after cooling, the modified electric furnace slag Part of the samples were crushed and ball milled to below 200 mesh for magnetic separation. The test results show that the basicity of modified steel slag is reduced from 2.35 to 1.38, the ratio of Fe2O3 to FeO content (mass percentage) is 0.99, and the iron recovery rate is 73.71%, which is 132.09% higher than that of unmodified steel slag.

no. 3 example

[0051] Add 25% (mass percentage) river sand into the molten converter slag, and the silicon oxide content of the river sand is 71.26%; further air-cool the evenly melted modified slag, and break some samples of the modified converter slag after cooling Ball mill to below 200 mesh for magnetic separation. The test results showed that the basicity of the modified steel slag was reduced from 2.35 to 1.39, Fe 2 o 3 The ratio of FeO content (mass percentage) is 1.88, and the recovery rate of iron is 50.59%, which is 59.29% higher than that of unmodified steel slag.

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Abstract

The invention discloses a method for improving the recovery rate of an iron component in steel slag. The method comprises the steps of: mixing modifiers in a predetermined proportion in the steel slag in a molten state, that is, in a process of discharging the molten steel slag, adding the modifiers into the steel slag, directly melting the modifiers by virtue of sensible heat of the steel slag, and changing the alkalinity of the steel slag by means of a molten state modifying method, wherein the adulterate amount of the modifiers is smaller than or equal to 25% by mass of the steel slag; and by adding the modifiers containing silicon oxide and / or iron oxide to recombine the component of the steel slag, increasing the contents of magnetite and hercynite so as to improve the recovery rate of the iron component. According to the method disclosed by the invention, sensible heat of the molten steel slag is effectively utilized, so that heat needs not to be compensated in the modifying process; the modifiers which are added into the steel slag are either cheap raw materials or solid wastes such as tailings and dust slime, so that optimization and synergic action of resources are realized. Meanwhile, by adding the modifiers containing silicon oxide and / or iron oxide and increasing the contents of magnetite and hercynite after component recombination, the recovery rate of the iron component in the steel slag is improved.

Description

technical field [0001] The invention belongs to the technical field of industrial solid waste treatment, and in particular relates to a method for improving the recovery rate of steel slag and iron components. Background technique [0002] In the industrial field, especially the metallurgical industry, there is a large amount of solid waste, such as steel slag. Steel slag includes electric furnace slag and converter slag, and its main chemical composition is CaO, Fe 2 o 3 , SiO 2 、Al 2 o 3 , MgO, MnO, there are a large number of beneficial chemical components. Therefore, it is necessary to effectively recycle steel slag. At present, the resource utilization of steel slag is mainly concentrated in three aspects, one is recycling in iron and steel enterprises, the other is using it as building materials, and the third is using it as fertilizer and soil conditioner in agriculture. However, the utilization rate of the tailings after steel slag is only 20%, and the rest of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/015C21B3/06
CPCB03C1/015C21B3/06Y02W30/50
Inventor 李宇马帅卢翔刘晓明苍大强
Owner UNIV OF SCI & TECH BEIJING
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