Method for recovering iron in steel slag and using tailing thereof

A technology for steel slag and tailings, which is applied in the field of comprehensive utilization and treatment of steel slag, can solve the problems of insufficient utilization of tailings and low iron recovery rate, and achieve the effect of reducing sintering cost and realizing comprehensive recycling and utilization.

Inactive Publication Date: 2016-06-29
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems in the prior art that the recovery rate of iron in steel slag is not high, and the tailing slag after magnetic separation is not fully utilized.

Method used

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  • Method for recovering iron in steel slag and using tailing thereof
  • Method for recovering iron in steel slag and using tailing thereof
  • Method for recovering iron in steel slag and using tailing thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The present embodiment selects the steel slag that certain enterprise steelmaking produces, a kind of method for reclaiming the iron in steel slag, it is characterized in that, comprises the following steps:

[0033] 1) Ball milling

[0034] The dried steel slag is placed in a ball mill, the rotating speed of the ball mill is 240r / min, and the ball milling time is 25min; in the ball mill process, steel balls with the same weight as the steel slag are added in the ball mill, and the diameter of the steel ball is 25mm.

[0035] 2) Screening

[0036] Sieve the steel slag after ball milling obtained in step 1), and divide it into steel slags of five particle sizes: >40mm, 10-40mm, 5-10mm, 1-5mm, and <1mm; conduct.

[0037] 3) Magnetic separation

[0038] The steel slag of five particle sizes is subjected to magnetic separation, and the iron-containing steel slag of each particle size and the tailing slag of each particle size are recovered respectively; the magnetic sep...

Embodiment 2

[0042] The non-magnetic tailings obtained in Example 1 are used for secondary utilization of resources. The steps described are as follows:

[0043] 5.1) Mix the tailings obtained in step 4) with iron ore powder, sintering flux, and coke powder to obtain a sintering mixture; keep the sintering basicity (R=CaO / SiO 2 ) is 2.0.

[0044] The iron ore powder includes five types of Indian powder, Australian powder, return ore, iron concentrate powder and low iron ore powder, and the sintering flux includes limestone, quicklime and dolomite.

[0045] The ingredients (percentage / %) of the tailings, iron ore powder, sintering flux and coke powder are shown in Table 1.

[0046] Table 1

[0047]

[0048] After testing, the chemical composition of the sintered raw materials is shown in Table 2.

[0049] Table 2

[0050] product name

TF

SiO 2

CaO

MgO

al 2 o 3

h 2 o

burn out

Indian powder

56.35

7.08

0.64

0.22

6....

Embodiment 3

[0063] The non-magnetic tailings obtained in Example 1 are used for secondary utilization of resources. The steps described are as follows:

[0064]5.1) Mix the tailings obtained in step 4) with iron ore powder, sintering flux, and coke powder to obtain a sintering mixture; keep the sintering basicity (R=CaO / SiO 2 ) is 2.0.

[0065] The iron ore powder includes five types of Indian powder, Australian powder, return ore, iron concentrate powder and low iron ore powder, and the sintering flux includes limestone, quicklime and dolomite.

[0066] The ingredients (percentage / %) of the tailings, iron ore powder, sintering flux and coke powder are shown in Table 5.

[0067] table 5

[0068]

[0069] After testing, the chemical composition of the sintered raw materials is shown in Table 2.

[0070] 5.2) Put the sintered mixture obtained in step 5.1) into a mixer for granulation. During the mixing process, 7.5±0.5% of water by weight of the sintered mixture is added; the granula...

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Abstract

The invention discloses a method for recovering iron in steel slag and using tailing thereof. The method is characterized by comprising the flows of: 1) drying of the steel slag; 2) ball milling of the steel slag; 3) classification and magnetic separation; 4) returning of crude slag to ball milling; and 5) magnetic separation of the tailing as a sintering flux. The method, provided by the invention, uses the methods of ball milling, classification and magnetic separation for recovering the iron in the steel slag, and uses the magnetically separated tailing as the sintering flux for further recovering non-selected iron and other useful metal elements in the magnetically separated tailing, so that 100% recovery of the iron in the steel slag is realized, the sintering cost is reduced, and the comprehensive recycling of the steel slag resource is realized.

Description

technical field [0001] The invention relates to the field of comprehensive utilization and treatment of steel slag, in particular to a method for recycling iron in steel slag and utilizing the tailing slag. Background technique [0002] Steel slag is a solid slag body composed of slag-forming materials, smelting reactants, eroded and fallen furnace body and furnace repair materials, impurities brought in by metal charge and slag-forming materials specially added to adjust the properties of steel slag during the steel production process. , is a by-product of the process of producing steel. In production, 15% to 20% of steel slag is produced for every 1 ton of steel produced. In my country, the total amount of steel slag accumulated in the national steelmaking plants exceeds 400 million tons, covering an area of ​​more than 10,000 mu, and the number is still increasing by more than 90 million tons every year. If these steel slags are not comprehensively utilized, more and mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04C22B1/248
CPCC21B3/04C22B1/248Y02W30/50
Inventor 刘清才孟飞陈奎董凌燕兰苑培杨剑任山朱博洪朱广太孔明周强郭富强刘国庆
Owner CHONGQING UNIV
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