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A method for recovering fine iron powder from iron and steel metallurgy iron-containing dust by using hydrocyclone separation method

A technology of hydrocyclone separation and iron and steel metallurgy, which is applied in the field of recovering iron fine powder and co-producing potassium salt, can solve the problems such as affecting the life of blast furnace ironmaking forward blast furnace, reducing the output and quality of sintered ore, affecting the permeability of the sintering process, etc. , to achieve the effect of low raw material price, low processing cost and small footprint

Active Publication Date: 2017-06-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the total iron content of most of the dust is not high, it is difficult to directly meet the requirements of sintering and ironmaking process, and the iron grade needs to be further improved
Moreover, it contains high Zn, Pb, K, Na and other elements harmful to steel production, which are directly used as iron raw materials for sintering and recycling. The cyclic enrichment of harmful elements will seriously affect the gas permeability of the sintering process and reduce the sintering. Yield and quality, which in turn affect the smooth running of blast furnace ironmaking and the life of blast furnace

Method used

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  • A method for recovering fine iron powder from iron and steel metallurgy iron-containing dust by using hydrocyclone separation method
  • A method for recovering fine iron powder from iron and steel metallurgy iron-containing dust by using hydrocyclone separation method
  • A method for recovering fine iron powder from iron and steel metallurgy iron-containing dust by using hydrocyclone separation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Pass a steel metallurgical dust with a total iron content of 43.98% through a 16-mesh sieve to filter out large particles with a particle size greater than 1 mm;

[0029] (2) Mix the dust and water in the step (1) into a slurry with a solid content of 10%;

[0030] (3) Add the slurry in the step (2) into the stirring tank and stir at a speed of 100 r / min for 20 minutes;

[0031] (4) Pump the evenly stirred dust slurry in the step (3) into a single Φ100mm hydrocyclone separation system, use the bottom flow port with a diameter of Φ14mm for impurity removal and separation, and the inlet pressure is 0.2Mpa;

[0032] (5) Collecting overflow and underflow products from the products in step (4) respectively, filtering and drying;

[0033] (6) If the K content of the filtrate after product filtration in step (5) is lower than 8%, it is directly returned to step (1) for reuse in pulping. If the K content is higher than 8%, it is used as mother liquor to produce potassium ...

Embodiment 2

[0036] (1) Pass a steel metallurgical dust with a total iron content of 34.27% through a 16-mesh sieve to filter out large particles with a particle size greater than 1 mm;

[0037] (2) Mix the dust and water in the step (1) into a slurry with a solid content of 20%;

[0038] (3) Add the slurry in the step (2) into the stirring tank and stir fully at a speed of 60 r / min for 10 minutes;

[0039] (4) Pump the uniformly stirred dust slurry in step (3) into a Φ50mm-Φ100mm series hydrocyclone separation system for impurity removal and separation. The diameter of the bottom flow port of the first stage Φ100mm cyclone is Φ14mm, and The pressure is 0.1Mpa, the diameter of the bottom outlet of the second-stage Φ50mm cyclone is Φ6mm, and the inlet pressure is 0.15Mpa. The series scheme is as follows figure 2 shown;

[0040] (5) Collecting overflow and underflow products from the products in step (4) respectively, filtering and drying;

[0041] (6) If the K content of the filtrate af...

Embodiment 3

[0044] (1) Pass a steel metallurgical dust with a total iron content of 38.77% through a 16-mesh sieve to filter out large particles with a particle size greater than 1 mm;

[0045] (2) Dust and water in the step (1) are formulated into a slurry with a solid content of 5%;

[0046] (3) Add the slurry in the step (2) into the stirring tank and stir fully at a speed of 60 r / min for 20 minutes;

[0047] (4) Pump the uniformly stirred dust slurry in the step (3) into a Φ50mm-Φ75mm series hydrocyclone separation system for impurity removal and separation. The diameter of the bottom flow port of the first stage Φ75mm cyclone is Φ12mm, and The pressure is 0.2Mpa, the diameter of the bottom outlet of the second-stage Φ50mm cyclone is Φ4mm, and the inlet pressure is 0.1Mpa. The series scheme is as follows image 3 shown;

[0048] (5) Collecting overflow and underflow products from the products in step (4) respectively, filtering and drying;

[0049] (6) If the K content of the filtrat...

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Abstract

The invention discloses a method for recovering fine iron powder from ferrous metallurgy iron-contained dust by using a hydraulic cyclone separation method. Firstly, large-particle impurities with particle sizes greater than 1 mm are filtered away through screening; dust and water are prepared to form slurry with a solid content of 5-30%; then, the slurry is pumped into ahydraulic cyclone separation system for impurity removal and separation; and overflow and underflow products are separatelycollected, and are filtered and dried. The method can separate out the fine iron powder with a total iron content of greater than 50%; K and Na contents are smallerthan 3%; and sintering and iron smelting procedures can be satisfied. Meanwhile, cyclone product filtrate can serve as mother liquor for co-production of potassium salt; and waste water is circulated in a closed-loop manner in the technological process to realize comprehensive recovery and resource cyclic utilization of metallurgic dust. The method has the advantages of low treatment cost, simplicity in operation, environmental protection, wide application range of raw materials, capability of adjusting core parameters of the hydraulic cyclone separation system for dust with different components and particle-size rangesto achieve optimal separation effect and recovery rate.

Description

technical field [0001] The invention belongs to the technical field of recycling treatment and utilization of solid waste in the metallurgical industry, and specifically relates to a method for recovering fine iron powder from ferrous metallurgical iron dust by using a hydrocyclone separation method, removing K and Na at the same time, and co-producing potassium salt. Background technique [0002] With the rapid development of China's steel industry and the rapid increase in steel production, the emission of dust waste from various steel plants has increased year by year. The amount of dust generated by iron and steel enterprises is generally about 10% of the steel output. Based on the annual output of 800 million steel, the annual dust amount of my country's iron and steel industry is about 80 million tons. The content of Fe and C in iron and steel metallurgical dust is relatively high, and the current high-grade iron ore resources in the world are depleting day by day, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/04
CPCC21B3/04C21B2200/00Y02W30/50
Inventor 钟怡玮郭占成陈攀泽高金涛
Owner UNIV OF SCI & TECH BEIJING
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