Harmless treatment method for stainless steel rolling oil sludge

Abstract

The invention relates to a harmless treatment method of stainless steel rolled oil sludge, which is characterized by sequentially comprising the following steps: 1) filtering and stirring the stainless steel rolled oil sludge to form flowing liquid; 2) primary separation: conveying the flowing liquid to a horizontal centrifuge through a slurry pump for solid-liquid primary separation; 3) secondaryseparation: conveying the rolling mixed oil subjected to primary separation into a butterfly centrifuge for solid-liquid separation again; 4) third separation: conveying the rolling oil subjected tosecond separation into a tubular centrifuge for solid-liquid separation, wherein the rolling oil obtained after three times of separation is filtered and purified for standby application, the rollingoil obtained through the treatment method is high in oil product cleanliness and can be repeatedly used, the whole treatment process is environmentally friendly and free of emission of three wastes, and the harmless treatment effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and recycling produced in the stainless steel rolling production process, and in particular relates to a harmless treatment method for stainless steel rolling oil sludge. Background technique [0002] Because cold-rolled stainless steel strips have high requirements on the surface, mineral oil is widely used for cooling and lubrication in cold-rolled stainless steel strips. During the cooling and lubricating process, the rolling oil takes away the iron filings on the stainless steel surface. In the process of rolling oil recovery and reuse, it must go through primary and secondary filtration, backwashing of the primary and secondary filter elements, and the backwashed oil enters the residual oil tank for tertiary sedimentation, and the precipitated solid-liquid mixture (sludge) is discharged to the sludge box. The oil sludge is black and viscous, with high metal content, small part...

AI Technical Summary

Problems solved by technology

The method comprises the following steps: (1) mixing and reacting scrap steel rolling oil with inorganic acid, and then separating the obtained reaction mixture into layers to separate an upper oil phase and a lower salt-containing phase; (2) distilling the oil phase, Separating the fraction with a boiling point below 500°C; (3) cooling and crystallizing the brine-containing phase to separate the iron salt; extracting the remaining oil phase by distillation to extract the raw materials for preparing rolling oil, and the rolling oil is extracted by distillation , which is likely to cause environmental pollution, and the oil cleanliness of the extracted rolling oil is low

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