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Preparation device for modified physical-property-reconstructed steel slag micro powder and application method

A steel slag fine powder and preparation device technology, which is applied in the field of comprehensive recycling of metallurgical slag resources, can solve the problems of waste of heat energy and low utilization rate of sensible heat of steel slag, and achieve the effects of reducing costs, eliminating land occupation by waste slag, and thinning the thickness of slag layer

Pending Publication Date: 2021-03-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the cost problem, the sensible heat utilization rate of steel slag is very low, resulting in a huge waste of heat energy. Making full use of the sensible heat of steel slag is of great significance to realize the efficient utilization of resources and energy and reduce energy saving and consumption reduction of iron and steel enterprises.

Method used

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  • Preparation device for modified physical-property-reconstructed steel slag micro powder and application method
  • Preparation device for modified physical-property-reconstructed steel slag micro powder and application method
  • Preparation device for modified physical-property-reconstructed steel slag micro powder and application method

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preparation example Construction

[0035] The method for preparing modified physical property reconstituted steel slag micropowder according to the present invention comprises the following steps:

[0036](1) Mix steel slag, reducing agent, additives and binders to make a mixture, add the mixture to the centrifugal field carbonization furnace through the packing chamber, and adopt the centrifugal field enhanced carbothermal reduction method to make the high-valent weak magnetic iron in the steel slag Fe2O3 is transformed into low-valence iron FeO and Fe3O4 and iron elemental Fe, and high-valence phosphorus P2O5 is transformed into elemental phosphorus P to obtain high-temperature preliminary modified physical properties of reconstituted steel slag;

[0037] (2) Put the high-temperature preliminary modified physical property restructured steel slag into the waste heat recovery system for waste heat recovery and utilization, remove the elemental phosphorus therein, and obtain the modified physical property restruc...

Embodiment 1

[0052] Put steel slag, coal gangue, calcium carbonate and bentonite into steel slag: coal gangue: calcium carbonate: bentonite = 100:33:15:5 according to the mass ratio, and put them into the carbonization furnace in the centrifugal field, and use the centrifugal field to strengthen the carbothermal reduction method for reduction roasting. The calcination temperature is 1300°C, and the calcination time is 30 minutes to obtain the dephosphorization reduction product. During the cooling process of the reduction product, the waste heat is recovered, and then the two-stage technology of vertical mill plus ultra-fine ball mill is used for grinding and high-current high-magnetism with a magnetic field strength of 1000mT. Technology for high-efficiency separation. After magnetic separation, the blown amount of steel slag fine powder is 10kg / tFe. Steel slag fine powder and fine coal powder are mixed according to the mass ratio of steel slag fine powder: fine coal powder = 0.8:1, and bla...

Embodiment 2

[0054] Put steel slag, coal gangue, calcium carbonate and bentonite into steel slag: coal gangue: calcium carbonate: bentonite = 100:33:15:5 according to the mass ratio, and put them into the carbonization furnace in the centrifugal field, and use the centrifugal field to strengthen the carbothermal reduction method for reduction roasting. The calcination temperature is 1400°C, and the calcination time is 20 minutes to obtain the dephosphorization reduction product. During the cooling process of the reduction product, the waste heat is recovered, and then the two-stage technology of vertical mill plus ultra-fine ball mill is used for grinding and high-current high-magnetism with a magnetic field strength of 1200mT. Technology for high-efficiency separation. After magnetic separation, the blown amount of steel slag fine powder is 15kg / tFe. Steel slag fine powder and fine coal powder are mixed according to the mass ratio of steel slag fine powder: fine coal powder = 1:1, and blast...

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Abstract

The invention relates to a preparation device for modified physical-property-reconstructed steel slag micro powder and an application method. The preparation device comprises a filler chamber, a centrifugal external field carbonization furnace, a waste heat recovery system, a phosphorus powder recovery system and a grinding-magnetic separation multi-force-field coupling regulation and control device; the centrifugal external field carbonization furnace comprises a feed hopper, a discharge port and a baffle plate, wherein the feed hopper is connected to the filler chamber, and the discharge port is connected to the waste heat recovery system; and the waste heat recovery system is connected to the phosphorus powder recovery system and the grinding-magnetic separation multi-force-field coupling regulation and control device. According to the preparation device, a reaction interface is enlarged by utilizing a centrifugal external field, steel slag phase reconstruction and element migrationkinetics are accelerated, multi-component efficient separation is realized by adopting multi-force-field coupling regulation and control, the modified physical-property-reconstructed steel slag micropowder is used for being blown into a blast furnace, so that the modified physical-property-reconstructed steel slag micro powder serves as secondary energy to be utilized, waste is turned into wealth, in addition, conditions are created for eradicating land occupation of waste slag and curbing environmental pollution, and the preparation device has important significance in recycling the waste slag and saving energy.

Description

technical field [0001] The invention belongs to the field of comprehensive recycling of metallurgical slag resources, and in particular relates to a preparation device and application method of modified physical property reconstructed steel slag micropowder. Background technique [0002] In the prior art, as the steel output continues to rise, the corresponding amount of steel slag discharged also continues to increase. In 2019, China's crude steel production was 996.3 million tons, accounting for 53.3% of the global crude steel production, ranking first in the world. About 15% of steel slag is produced per ton of converter steel, and the annual amount of steel slag is about 120 million tons. According to incomplete statistics, the accumulated stockpile exceeds 1.8 billion tons by the end of 2019, and the current effective utilization rate of steel slag in China is only about 30%. , not only wasting resources, occupying a large amount of cultivated land but also causing env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08B02C4/08B02C4/30B02C23/08B03C1/02C01B25/02
CPCB02C4/08B02C4/30B02C23/08B03C1/02C01B25/02C21B3/06C21B3/08C21B2400/02C21B2400/08Y02W30/50Y02P10/20Y02P20/10Y02P20/129
Inventor 袁章福王容岳于湘涛刘克施春红廖亮
Owner UNIV OF SCI & TECH BEIJING
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