Deferrization process for steel scoria and application of steel scoria fine powder thereof

Abstract

The invention discloses a deferrization process for steel slag and application of steel scoria fine powder thereof which comprises the steps of steel slag drying, fine grinding, air choosing, ferrum expelling, ferrum powder discharge, coarse powder returning for fine grinding, and mixing steel slag fine powder with semi-finished cement.

Description

technical field [0001] The invention relates to the secondary utilization of steel slag, in particular to the iron removal process of waste steel slag and the application of steel slag fine powder. Background technique [0002] Converter steel slag is the waste slag discharged during the steelmaking process. It has certain activity and contains a certain amount of iron. After treatment, the iron-containing substances are selected for steelmaking or sintering raw materials. The remaining part is mostly waste slag with a diameter of less than 10m. Some waste slag is generally used as building materials or cement, etc., and the iron content of cement made from it is high, and the amount of addition is limited, so it is difficult to ensure the quality of cement. It can only be used as a base material for construction or roads. However, steel slag has With a certain degree of expansibility, it is easy to "flour" the roadbed when used as asphalt concrete. Therefore, the problem o...

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Problems solved by technology

[0002] Converter steel slag is the waste slag discharged during the steelmaking process. It has certain activity and contains a certain amount of iron. After treatment, the iron-containing substances are selected for steelmaking or sintering raw materials. The remaining part is mostly waste slag with a diameter of less than 10m. Some waste slag is generally used as building materials or cement, etc., and the iron content of cement made from it is high, and the amount of addition is limited, so it is difficult to ensure the quality of cement. It can only be used as a base material for construction or roads. However, steel slag has With a certain degree of expansibility, it is easy to make the roadbed "flour" when used as asphalt concrete

Therefore, the problem of the reuse of this steel scrap slag is still a difficult problem in many research departments. The application number is 02124081.7, which discloses a steel slag treatment method, which introduces a steel slag treatment process, which is mainly through the treatment of steel slag. Select steelmaking and ironmaking raw materials, among which steel slag of 0mm to 10mm is used to select iron, and its by-products are used to make cement. The technological process it adopts is screening, grinding, sorting, and magnetic separation. Sieve the steel slag before grinding, and only send the slag with a particle size of 0mm to 3mm into the ball mill for grinding processing. After sorting and magnetic separation, the remaining iron powder is extracted as cement raw material. This method not only increases the screening cost. However, the steel slag above 3mm can only be used as waste as the raw material for asphalt concrete. Therefore, the steel slag cannot be fully utilized, and the problem of zero discharge of steel slag cannot be completely solved.

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