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Method for recycling metal iron from steel slag of converter

A converter steel slag and metal iron technology is applied in the field of recovering metal iron from converter steel slag and recovering metal iron resources. Investment cost and follow-up beneficiation cost, high metal iron recovery rate and product grade, and the effect of improving quality

Active Publication Date: 2014-08-13
KUNMING METALLURGY INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although the above-mentioned steel slag recovery metal iron process has been applied in practice, these processes have problems such as low metal iron recovery rate and low iron recovery rate, which limit the further popularization and application of these recovery processes

Method used

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  • Method for recycling metal iron from steel slag of converter
  • Method for recycling metal iron from steel slag of converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a pilot test, the daily processing capacity is 20t / d, and the steel slag grade is 17.67%.

[0022] The metal iron in the converter steel slag is recovered by the method shown in the attached figure. The converter steel slag is firstly recovered by a rod screen to recover the large slag steel of +300mm. Bar sieve screening and manual selection are used to select -300+130mm large slag steel, and the +130mm large steel slag is returned to the jaw crusher for crushing; -130mm steel slag is screened by a grading 70mm sieving machine into -130+70mm And -70mm two grades; -130+70mm steel slag is sorted with a magnetic pulley (magnetic field strength of 800Oe) to select the medium-130+70mm high-grade slag steel, and the -130+70mm tailings are crushed with a jaw crusher Return to 70mm sieving machine screening; -70mm steel slag is classified into -70mm+25mm sieving and -25mm two particle sizes for dry magnetic separation (magnetic drum) throwing, the magnetic field strength is...

Embodiment 2

[0027] The annual output of converter steel slag in a large-scale steelmaking enterprise in Yunnan is 600,000t / a (2000t / d), and the grade of steel slag is 21.56.

[0028] The metal iron in the converter steel slag is recovered by the method shown in the attached figure. The converter steel slag is firstly recovered by a rod screen to recover the large slag steel of +300mm. The large slag steel of -300+130mm and the steel slag of -130+70mm grain size are screened out by the bar sieve, which is further crushed by the jaw crusher and then passed through the sorting method of vibrating screen + magnetic pulley (magnetic field strength is 1000Oe) to select the middle block High-grade slag steel; -70mm coarse concentrate is wet-type full-size grinding with a rod mill (grinding time 15min), and the pulp after grinding is screened with a +1mm drum sieve, and the +1mm particle size obtained after screening After dry magnetic separation (1500Oe magnetic drum) to remove slag, then use +1...

Embodiment 3

[0033] The annual output of converter steel slag in a steelmaking enterprise in Yunnan is 260,000t / a, and the grade of steel slag is 20.98.

[0034] The metal iron in the converter steel slag is recovered by the method shown in the attached figure. The converter steel slag is firstly recovered by a rod screen to recover the large slag steel of +300mm. The large slag steel of -300+130mm and the steel slag of -130+70mm grain size are screened out by the bar sieve, which is further crushed by the jaw crusher and then passed through the sorting method of vibrating screen + magnetic pulley (magnetic field strength is 1800Oe) to select the middle block High-grade slag steel; -70mm coarse concentrate is wet-type full-size grinding with a rod mill (grinding time 20min), and the pulp after grinding is screened with a +1mm drum sieve, and the +1mm particle size obtained after screening After dry magnetic separation (2000Oe magnetic drum) to remove slag, use +10mm vibrating screen to obt...

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Abstract

The invention relates to a method for recycling metal iron resources from waste residues of the iron and steel industry, particularly relates to a method for recycling metal iron from steel slag of a converter, and belongs to the technical field of benefication and comprehensive utilization of resources. The method includes recycling the metal iron from the slag of the converter by a cascade separation technological method, a dry magnetic separation technological method for discarding tailings and a wet concentration technological method, and is characterized in that +70mm large high-grade steel slag of the steel slag of the converter is in cascade separation and recycling, -70mm large high-grade steel slag is in classification dry magnetic separation for discarding tailings, rough concentration is further in full-grain wet ore grinding for separating slag from iron, cascade screening and cascade magnetic separation, and finally the metal iron with different grain sizes and magnetic iron concentration are obtained. The method has the advantages of high recycling rate and the grade of the metal iron, simplicity in technological process, simplicity and convenience in operation, low production cost, applicability to processing different types of steel slag of converters, and the like.

Description

technical field [0001] The invention relates to a method for recovering metallic iron resources from iron and steel industry waste slag, in particular to a method for recovering metallic iron from converter steel slag, and belongs to the technical field of ore dressing and resource comprehensive utilization. Background technique [0002] my country is the world's largest steel production country, and realizing the comprehensive utilization of solid waste resources in iron and steel enterprises is one of the long-term strategic guidelines to ensure the healthy development of my country's national economy and society. In recent years, with the rapid development of my country's economy, steel production has grown rapidly. In 2010, China's crude steel production has exceeded 600 million tons. In 2011, China's crude steel production was 683 million tons. Calculated by producing about 0.12 tons of steel slag per ton of steel, It means that 72 million and 82 million tons of steel sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/04B03C1/30
CPCY02P10/20Y02W30/50
Inventor 白荣林屠建春业超成建陆永军李彦韩迎张艳芬侯可为刘伟胡娟王学文毛利强劳忠友余艳平
Owner KUNMING METALLURGY INST
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