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Treatment method of converting steel slag

A processing method and technology for steel slag, applied in the direction of manufacturing converters, etc., can solve problems such as unfavorable use

Active Publication Date: 2016-06-01
CENT NAT DE LA RECHERCHE SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method causes CO 2 emissions, which is exactly what we are currently trying to avoid
Furthermore, during processing, the phosphorus-containing P present in the slag 2 o 5 Also reduced and mostly (more than 80%) migrated to the iron-rich phase, which, as mentioned above, is unfavorable for the use of this phase in iron and steel smelting

Method used

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  • Treatment method of converting steel slag
  • Treatment method of converting steel slag
  • Treatment method of converting steel slag

Examples

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Embodiment Construction

[0124] In the example below, raw slag from the converted integrated steelworks of FossurMer (ArcelorMittal) is used as an export product. The slag was placed in a platinum crucible which was subsequently installed in a Nabatherm round bell furnace. All samples were heated to an initial temperature T of 1600°C or 1500°C i (start heating from 20℃, when T i At 1600°C, heat for 5 hours and 20 minutes or when T i at 1500°C for 5 hours) and then hold this temperature for 5 hours (step a 0 ). In an example of implementation, the cooling rate is imposed by the furnace and is constant at all times. The average rate therefore corresponds to the actual cooling rate at any one moment.

[0125] For all tests, the solidified samples were removed from the platinum crucibles after each cooling. To use the X-ray machine: X-ray Bruker D8 Advanced to analyze the sample by diffraction of X-rays, a part of the sample is recovered and crushed in a mortar, the largest pieces are wrapped and po...

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Abstract

The invention relates to a method for treating converted steel slag, which comprises the following steps: a) cooling the converted steel slag from an initial temperature Ti to a stage temperature Tp, where Ti is between 1500°C and 1600°C, and Tp is between 1200°C and 1400°C °C, that is: the average cooling rate from the initial temperature Ti to the stage temperature Tp is less than or equal to 10°C per minute, and the maximum cooling rate from the initial temperature Ti to the stage temperature Tp is less than 20°C per minute, then; b) Necessary Keep the converted steel slag at the stage temperature Tp within 1 hour to 48 minutes, and then; c) cool the converted steel slag from the stage temperature Tp to the final temperature Tf less than 1200 ° C, thereby forming the average size greater than 30 μm based on The calcium silicate-based phase and the calcium ferrite-based phase, d) crushing the converted steel slag obtained after cooling; e) separating the calcium silicate-based phase and the calcium ferrite-based phase.

Description

technical field [0001] The invention relates to a processing method for converting steel slag. Background technique [0002] Conversion slag (LAC, laitier d'aciérie de conversion), hereinafter also referred to as "slag", is quantitatively the second co-product from iron and steel smelting with an output of about 110 kg per ton of steel. Within the European region, millions of tonnes of slag deposits are immediately available for plant use, and in France the nominal annual production amounts to 1.2 Mt (million tonnes), of which more than 50% remains untapped. It shows that in the European region, there are millions of tons of converter slag deposits that can be used immediately by factories, of which more than 50% are still unexploited. [0003] After pig iron is converted to steel in a converter, the slag is usually poured into large pits where it is cooled by watering it. The solidified slag is then conveyed to screening equipment to obtain a screened product. In order t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/08C04B5/00C21C5/36
CPCC04B5/00C21B3/08C21C5/36C04B5/06
Inventor 雅克·波里尔纪尧姆·戴维南帕斯卡勒·普里让
Owner CENT NAT DE LA RECHERCHE SCI
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