A method for regeneration and reuse of cutting oily iron sludge

Abstract

The invention provides a method for regenerating reuse of cutting oil-containing iron sludge. The method comprises the following experimental steps that (1) oil removal is carried out, specifically, the oil-containing iron sludge is dispersed, and an oil removal agent is added to obtain the oil-removed iron sludge; (2), calcining is carried out, specifically, the oil-removed iron sludge obtained in the step (1) is subjected to calcining to obtain the calcined iron sludge; (3), magnetic separation reduction is carried out, specifically, a, magnetic separation is carried out firstly, and then reduction is carried out; or, b, reduction is carried out firstly, and then magnetic separation is carried out; (4) forming is carried out, specifically, iron concentrate obtained in a of the step (3) or iron-containing concentrate obtained in b of the step (3) is formed through a cold pressing process to obtain the formed concentrate; and (5) sintering is carried out, specifically, the formed concentrate obtained in the step (4) is processed under reduction atmosphere protection to obtain a powder metallurgy casting. According to the method for regenerating reuse of the oil-containing iron sludge, oil-containing iron sludge solid waste is used as a raw material so as to produce fine iron powder and stainless steel powder or to prepare the powder metallurgy casting, and thus the resourceful high-value utilization of dangerous solid is realized.

Description

technical field [0001] The invention relates to the technical field of solid waste resource treatment, in particular to a method for recycling oily iron sludge from cutting. Background technique [0002] Bearing steel is a kind of high-carbon chromium bearing steel with less alloy content, good performance and the most widely used. After quenching and tempering, it has high and uniform hardness, good wear resistance and high contact fatigue performance. At present, cutting steel products are used to make various bearing rings and rolling elements. For example: steel balls, rollers and rings for making internal combustion engines, electric locomotives, automobiles, tractors, machine tools, rolling mills, drilling machines, mining machinery, general machinery, and high-load mechanical transmission bearings rotating at high speeds. In addition to making balls, bearing rings, etc., it is sometimes used to make tools, such as dies, measuring tools, etc. [0003] In the process...

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Problems solved by technology

At the same time, the cutting process of the cutting machine will involve alumina (corundum), resulting in an increase in the aluminum content in the generated iron sludge; and the higher the aluminum content in the iron filings, the worse the performance of the casting made

[0004] Domestic methods for this iron sludge mainly include stockpiling and sending them to steel plants for recycling. The stockpiling method will not only cause secondary pollution, but also lead to serious waste of resources

Sending iron slime to the iron and steel plant for recycling can reduce land occupation, but the iron slime with high oil content and high impurity content will cause serious pollution and sticky furnace problems during the smelting process, resulting in the decline of steel quality and shortened furnace life.

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