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Granular iron preparation method and system

A technology for granulated iron and slag particles, which is applied in the field of the system for preparing granulated iron, can solve the problems of difficulty in engineering application, low thermal conductivity of slag, low thermal conversion efficiency, etc. Simple process effect

Active Publication Date: 2016-08-10
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to factors such as low thermal conductivity, high viscosity, and low heat conversion efficiency of slag, most of the existing research on slag is to recover high-temperature waste heat after dry granulation of slag, and there are still great difficulties in engineering application.
Therefore, this part of waste heat energy in the copper slag from the furnace has not been reflected in the traditional research process of the above-mentioned copper slag roasting reduction-grinding magnetic separation, and in the copper slag reduction roasting process, it will be heated again, resulting in energy huge waste of
[0005] Therefore, the method of using copper slag to prepare high-quality iron products remains to be studied

Method used

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  • Granular iron preparation method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The high-temperature molten copper slag discharged from the copper smelting furnace is used as raw material to prepare iron granules. The specific method is as follows:

[0061] (1) The high-temperature molten copper slag discharged from the copper smelting furnace at a temperature of 1150 to 1350°C is poured directly into the slagging furnace in hot state.

[0062] (2) Raise the temperature in the slagging furnace to 1400~1450℃, and add 10% of the weight of copper slag to the furnace through the charging port on the top of the slagging furnace, and a quicklime block with a particle size of 5-10mm, which is coated with refractory materials. After stirring the molten pool for 10 minutes by inserting the mechanical stirring paddle into the molten slag, add heat to the furnace again, and keep it for 10 minutes to fully homogenize to obtain a homogenized mixed molten copper slag.

[0063] (3) Pour the homogenized mixed molten copper slag into the tundish, and flow into the granula...

Embodiment 2

[0068] The high-temperature molten copper slag discharged from the copper smelting furnace is used as the raw material to prepare iron granules.

[0069] (1) The high-temperature molten copper slag discharged from the copper smelting furnace at a temperature of 1150 to 1350°C is poured directly into the slagging furnace in hot state.

[0070] (2) Raise the temperature in the slagging furnace to 1380~1430℃, and add 20% of the weight of copper slag to the furnace through the charging port on the top of the slagging furnace, and a limestone block with a particle size of 10-15mm, which is coated with refractory materials. After stirring the molten pool for 20 minutes with the mechanical stirring blade inserted into the molten slag, the furnace is heated again, and the temperature is kept for 10 minutes to fully homogenize, and a homogenized mixed molten copper slag is obtained.

[0071] (3) Pour the homogenized copper slag into the tundish, and flow it into the granulator through the sla...

Embodiment 3

[0076] The high-temperature molten copper slag discharged from the copper smelting furnace is used as the raw material to prepare iron granules.

[0077] (1) The high-temperature molten copper slag discharged from the copper smelting furnace at a temperature of 1150 to 1350°C is poured directly into the slagging furnace in hot state.

[0078] (2) Raise the temperature in the slagging furnace to 1350~1400℃, and add 30% of the weight of copper slag to the furnace and a limestone block with a particle size of 15-20mm through the charging port on the top of the slagging furnace. After stirring the molten pool for 20 minutes with the mechanical stirring blade inserted into the molten slag, the furnace is heated again, and the temperature is kept for 20 minutes to fully homogenize to obtain a homogenized mixed molten copper slag.

[0079] (3) Pour the homogenized mixed molten copper slag into the tundish, and flow it into the granulator through the slag port, control the rotating cup of th...

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Abstract

The invention discloses a granular iron preparation system and method. The granular iron preparation system comprises a slag melting device, a granulator, a reduction roasting device, a magnetic separation device and a gravity concentration device. By the system, melted copper slags are taken as raw materials, the problem that the traditional high-temperature copper slags only can be continued being treated after being cooled by water quenching or cooled slowly is solved, high-grade granular iron and zinc oxide dust can be prepared, and the heat utilization rate of the system is high. In addition, an additive inlet is formed in the slag melting device, an additive is added in the high-temperature melted copper slags before heating treatment, the melted copper slags can be homogenized after being stirred by a stirrer, the interior structures and chemical components of the copper slags are adjusted directly, the metallurgical performance of the copper slags is improved, then the copper slags are granulated at high temperature, so that granulated copper slag raw materials can be provided for direct reduction of a rotary hearth furnace, technologies such as pelletizing, drying and pellet preheating are omitted, the reduction time of the rotary hearth furnace is shortened, and the energy consumption of the rotary hearth furnace is reduced.

Description

Technical field [0001] The invention relates to a method for preparing granulated iron, and a system for preparing granulated iron for implementing the method for preparing granulated iron. Background technique [0002] Copper slag is a solid waste slag produced in the process of pyrometallurgical copper smelting, which is one of non-ferrous metal slag. According to an incomplete estimate, the annual output of copper slag in my country is 10-15 million tons, and the accumulated stockpiles have reached hundreds of millions of tons. These waste residues not only occupy a large amount of land, but also cause environmental problems such as dust, heavy metal seepage, groundwater pollution, and land dilution, which bring serious harm to human survival and social development. So far, due to insufficient attention to the recycling of copper slag and the constraints of related technology, in our country, the efficient and comprehensive utilization of copper slag has not yet achieved larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/10C22B1/24C22B19/34C22B19/30
CPCC21B13/008C21B13/10C22B1/24C22B19/30C22B19/34Y02P10/20
Inventor 刘占华王欣陈文亮曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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