Metallurgical slag zero-emission comprehensive utilization technology
A zero-emission, metallurgical slag technology, applied in the field of metallurgical slag recovery and screening using crushing and magnetic separation processes, can solve problems such as environmental pollution, waste of resources, and failure of comprehensive utilization of products, and achieve the effect of improving economic value.
Active Publication Date: 2015-04-29
LONGI MAGNET CO LTD
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Problems solved by technology
The treatment process and effect of domestic large and medium-sized metallurgical slag treatment plants are still at the level of 20 years ago, and the products after sorting cannot meet the requirements of comprehensive utilization, resulting in waste of resources and environmental pollution
Method used
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Embodiment Construction
[0014] The implementation steps of the zero-discharge comprehensive utilization process of metallurgical slag are as follows:
[0015] 1) Feeding
[0016] The steel slag is loaded into the material receiving trough 1 by a forklift, and there is a tiltable grid sieve 2 on the material receiving trough 1, and the tiltable grid sieve 2 has a sieve hole of 250mmx250mm. Large pieces of steel slag larger than 250mm slide into one side of the manger 3. After crushing, the materials smaller than 250mm directly enter the 1# belt conveyor 4 of the processing line. Greater than 90%. The 1# belt conveyor 4 is equipped with a manual picking station, and the workers pick out the large visible metal and other valuable materials.
[0017] 2) Rod mill once
[0018] The steel slag less than 250mm enters the 1# belt conveyor 4 through the vibrating feeder under the trough, and then enters the 1# vibrating screen 5. The sieve hole of 1# vibrating screen 5 is 30mm, and the on-screen material en...
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Abstract
The invention discloses a metallurgical slag zero-emission comprehensive utilization technology. A vibrating screen, a rod mill, a magnetic-drum classificator and a magnetism machine serve as main screening devices, related devices are connected through a belt conveyor, the two-rod-milling three-magnetic-separation and four-screening mode is adopted, flow division, separation, smash and ore grinding are carried out on materials, the recovery rate of magnetic separation is improved, the content of monomer metallic iron in the materials is increased, and high-grade scrap steel in slag, high-grade magnetic separation powder and products with tailing metallic iron with the content less than 1% are obtained. According to the metallurgical slag zero-emission comprehensive utilization technology, the scrap steel in slag with the total-iron grade of more than 90% and the magnetic separation powder with total-iron grade of 60% can be obtained, and the content of tailing-grade metallic iron is smaller than 1%. The metallurgical slag zero-emission comprehensive utilization technology solves the problems that according to a common recovery technology in China, due to the facts that the total-iron grade of the scrap steel in slag is 60%, and the total-iron grade of magnetic separation powder is 40%, the recovery rate is low, and the purification effect is poor, and economic value of a recovery enterprise is improved.
Description
1. Technical field [0001] The invention relates to a process for recovering and purifying slag steel in metallurgical slag, which is a process method for recovering metallurgical slag by crushing, screening and magnetic separation processes. 2. Background technology [0002] A large amount of metallurgical slag is produced during the iron and steel smelting process, and its amount is about 15% to 20% of the steel output. Due to the complex and changeable composition of metallurgical slag, the utilization rate has not been high. Metallurgical slags have long been considered waste residues from the steelmaking process. The treatment process and effect of domestic large and medium-sized metallurgical slag treatment plants are still at the level of 20 years ago, and the products after sorting cannot meet the requirements of comprehensive utilization, resulting in waste of resources and environmental pollution. The recycling of metallurgical slag occupies an important position ...
Claims
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IPC IPC(8): B03B9/04B02C21/00B02C23/08
Inventor 张承臣赵能平徐家林黄树森
Owner LONGI MAGNET CO LTD