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Method for recovering iron from semi-molten reduction cold rolling sludge

A sludge and molten state technology is applied in the field of low-temperature recovery of metal iron in cold-rolled sludge, which can solve the problem of high utilization and energy consumption of metal iron, and achieve the effects of protecting the environment, suitable for popularization and use, and simple and easy to implement.

Pending Publication Date: 2021-07-23
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of high energy consumption of metallic iron in the cold rolling sludge of steel plants in the prior art, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for reclaiming iron from semi-molten reducing cold rolling sludge , by adjusting the conditions that affect the amount of iron and carbon, thereby reducing the melting point of metallic iron particles, recovering metallic iron resources in cold rolling sludge at a relatively low reaction temperature, and achieving the purpose of energy saving and emission reduction

Method used

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  • Method for recovering iron from semi-molten reduction cold rolling sludge

Examples

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Embodiment 1

[0032] In this embodiment, a method for reclaiming iron from semi-molten reducing cold rolling sludge comprises the following steps:

[0033] a. Sludge pretreatment and semi-molten carburizing process:

[0034] According to the ratio of reducible oxygen and carbon in the mixture of cold-rolled sludge and carbon powder is 1:1.2, the cold-rolled sludge is mixed with carbon powder, and the mixing components are adjusted to obtain cold-rolled sludge and carbon. Powder mixture, and then the mixture is pressed into blocks, and then put into the heating furnace for semi-molten carburizing;

[0035] Before starting to heat up, argon gas is introduced into the furnace to drive away the air inside the furnace, the flow rate of argon gas is controlled to 1L / min, and the heating rate is 5°C / min. And pass inert gas protection into the furnace, carry out semi-molten state carburization, obtain semi-molten state mixture, complete the carburization process; this embodiment is under the same ...

Embodiment 2

[0046] In this example, when mixing materials, the slag-forming components are added in advance according to the mass ratio of the slag-forming main components when the prepared iron-containing cold-rolled sludge lump ore is smelted and reduced in the step c. Raw material, mixed with cold mill sludge and carbon powder to form a mixture:

[0047] Table 1 selects the composition of synthetic slag

[0048]

[0049] Experimental test analysis:

[0050] By testing the influence of the liquid phase fraction of molten slag on the carburizing amount of metal particles, the influence of the melting degree of slag phase on the carburizing of metal particles inside the pellets was analyzed, and the reduction carburizing experiment of pellets with different slag phase compositions was carried out. By calculating the phase transformation melting curves of different eutectic points in the phase diagram, three slag phases with different melting degrees in the same slag system were select...

Embodiment 3

[0054] In this embodiment, the mass percentage of iron contained in the cold rolling sludge used is not less than 50wt%. Selecting sludge with higher iron content as semi-molten carburizing has the combined effect of economical efficiency, iron resource recovery and comprehensive environmental management benefit maximization. Thereby amplifying the demand of industrialization and realizing the practical application of this technology.

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Abstract

The invention discloses a method for recovering iron from semi-molten reduction cold rolling sludge. The method comprises the following steps of carburizing iron particles in the semi-molten state to form low-melting-point iron particles, taking the composition in the cold rolling sludge as an example, analyzing the main slag phase composition of the sludge through a phase, and determining the thermophysical properties such as the melting point of the slag phase by utilizing Factsage simulation; and performing carburizing reaction on pellets prepared by mixing iron particles and carbon powder in a box-type furnace, introducing argon gas for protection, and performing reaction at a certain temperature for 10 to 40 minutes. Iron is carburized to form low-melting-point metal particles, and the low-melting-point metal particles are melted and converged, so that metal elements in the slag can be recycled at a relatively low temperature. According to the method, the influence of the reaction time, the reaction temperature and the liquid phase fraction of the slag on the carburizing amount of the metal particles in the molten slag is researched, so that low-melting-point metal liquid drops can be formed, can aggregate and grow at low temperature and are finally collected, and maximum utilization of energy is achieved.

Description

technical field [0001] The invention relates to a treatment process for recovering metallic iron in cold rolling sludge at low temperature. The invention belongs to the technical field of comprehensive utilization and treatment of metallurgical solid waste. Background technique [0002] As the world's largest steel production country, China produces a huge amount of cold-rolled sludge every year along with the process of steel production. The sludge contains a large amount of precious metal resources. After drying, the iron content of the cold-rolled sludge exceeds 50% %, it is a very important recyclable resource for my country, which has a lot of lean ore and high steel output. [0003] At present, the treatment methods of cold rolling sludge in steel mills generally have the defects of high energy consumption and secondary pollution. Therefore, seeking a more economical treatment method is of great significance for reducing the disposal cost of sludge and recovering preci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C21B11/00
CPCC22B1/24C21B11/00Y02P10/20
Inventor 李秋菊李重河郑少波
Owner SHANGHAI UNIV
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