Method for improving iron grade of steel slag below 5mm
A technology of iron grade and steel slag, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of failing to meet the requirements of returning steel, unable to recycle, reduce the recycling rate of steel slag, etc., and improve the recycling rate. rate effect
Active Publication Date: 2021-09-03
MCC BAOSTEEL TECH SERVICE
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Problems solved by technology
However, the iron grade of the steel slag below 5mm produced after the purification treatment is less than 50%. Since the iron grade of the steel slag below 5mm is too low, it cannot meet the requirements for re-smelting steel and cannot be recycled, which reduces the recycling rate of steel slag.
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[0019] The implementation of the present application is described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or operated through other different specific implementation modes, and various modifications or changes can be made to the details in the present application based on different viewpoints and applications without departing from the spirit of the present application.
[0020] According to one aspect of the present application, a method for improving the iron grade of steel slag below 5mm is provided. see figure 1 , the method includes the following steps:
[0021] S1. Select steel slag with a predetermined weight, and divide the steel slag into two groups; each group of steel slag is divided into multiple equal parts.
[0022] The steel slag mentioned above includes th...
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Abstract
The invention discloses a method for improving the iron grade of steel slag below 5mm. The method comprises the following steps: dividing the steel slag into two groups, wherein each group of steel slag is divided into multiple equal parts; performing a dry magnetic separation test on the group of steel slag; in the group of tests, selecting the linear speed of the magnetic roller as a fixed value, and changing the magnetic induction intensity; acquiring the iron grade of the concentrate obtained through the group of tests, and determining the optimal magnetic induction intensity according to the iron grade of the concentrate; carrying out a dry magnetic separation test on the other group of steel slag; in the group of tests, selecting the magnetic induction intensity as a fixed value, and changing the linear speed of the magnetic roller; acquiring the iron grade of the concentrate obtained through the group of tests, and determining the optimal magnetic roller linear speed according to the iron grade of the concentrate; and carrying out dry magnetic separation on the steel slag by utilizing the optimal magnetic induction intensity and the optimal magnetic roller linear speed to obtain concentrate with the iron grade greater than 80%. The method provided by the invention can be used for treating the steel slag of less than 5mm to obtain the concentrate with the iron grade of more than 80%, the recovery rate of iron in the concentrate can reach 95%, and the recovery rate of the steel slag of less than 5mm is improved.
Description
technical field [0001] The application relates to the technical field of steel slag treatment, in particular to a method for improving the iron grade of steel slag below 5mm. Background technique [0002] Steel slag is a kind of solid waste produced in the steelmaking process. It is mainly composed of iron slag mixed with impurities and has a low iron grade. It must be purified before it can be recycled. Steel slag can get high-purity 5-250mm steel slag after primary treatment, crushing, screening, magnetic separation, ore grinding and other processes in secondary treatment. These 5-250mm steel slag has high iron grade and can meet the requirements of re-smelting . However, the iron grade of the steel slag below 5mm produced after the purification treatment is less than 50%. Since the iron grade of the steel slag below 5mm is too low, it cannot meet the requirements for re-smelting steel and cannot be recycled, which reduces the recycling rate of steel slag. Contents of t...
Claims
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IPC IPC(8): B03C1/02
CPCB03C1/02Y02W30/50
Inventor 刘华祥汤红魁黄晋培
Owner MCC BAOSTEEL TECH SERVICE