Method and system for echelon resource separation of tailings of stainless steel refining furnace

Abstract

The invention belongs to the technical field of solid waste treatment, and particularly relates to an echelon resource separation method and system for tailings of a stainless steel refining furnace.According to the method provided by the invention, a wet separation physical means is adopted in the whole process, so that dust pollution and sludge pollution are avoided; the method comprises the following steps: screening is performed to obtain screened materials with different particle sizes; then a jigger with a specific gravity separation function and a table concentrator are used for carrying out multi-stage separation on screened products, the separation efficiency and the extraction proportion of stainless steel in the tailings of the stainless steel refining furnace are improved, slag mud obtained through table concentrator separation is further separated through vibration, and tailings sand with different particle size gradations is obtained. According to the method provided bythe invention, the stainless steel refining furnace tailings are subjected to echelon resource separation, the obtained screened products can be reasonably graded, the adverse effect of instability onbuilding material formation during stainless steel refining furnace tailings recycling is avoided, and closed echelon resource utilization of the stainless steel refining furnace tailings is facilitated.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a method and system for step-by-step resource sorting of stainless steel refining furnace tail slag. Background technique [0002] In the metallurgical industry, a large amount of stainless steel refining furnace tailings will be produced after stainless steel refining. After the primary selection of stainless steel refining tailings, 1-6wt.% of massive, sandy or powdery stainless steel and 94-99wt.% of inorganic Solid tailings. The components of stainless steel refining furnace tailings and iron and steel blast furnace tailings and submerged arc slag are similar but the content is different; after blast furnace slag and submerged arc slag are re-selected and recovered from residual metals, the fine powder prepared by grinding the remaining materials can be used as cement, Concrete admixture application; however, the content of free calcium oxide and fr...

AI Technical Summary

Problems solved by technology

The components of stainless steel refining furnace tailings and iron and steel blast furnace tailings and submerged arc slag are similar but the content is different; after blast furnace slag and submerged arc slag are re-selected and recovered from residual metals, the remaining materials are pulverized to prepare fine powder, which can be used as cement, Concrete admixture application; however, the content of free calcium oxide and free magnesium oxide inert substances in the tailings of stainless steel refining furnaces is relatively high, and the materials obtained after metal gravity separation and recovery are likely to cause unstable cracking and strength reduction of building materials, so they cannot be directly mixed with blast furnace slag , ore slag similar applications

[0003] At present, the separation and recovery of stainless steel refining furnace tailings mainly focus on the recovery, extraction and smelting of valuable metals in stainless steel refining furnace tailings. For example, Chinese patent CN109468467A provides a method for recycling valuable metals from solid waste in the iron and steel industry, but This method lacks a resource utilization scheme for the remaining tailings; Chinese patent CN106179674A provides a method and system for resource recovery and utilization of steelmaking tailings, but this method uses relatively rough means to separate the tailings by impact damage, which can High consumption, large dust, did not realize the wet multi-stage separation and step-by-step resource utilization of tailings

The existing sorting and recovery treatment of stainless steel refining furnace tailings generally has the problems of rough process and incomplete sorting, and the full utilization of high value-added closed resources of stainless steel refining furnace tailings has not been realized

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