Method for extracting high-content nickel, chromium and iron from stainless steel dust

Abstract

The invention relates to a method for extracting high-content nickel, chromium and iron from stainless steel dust, which is characterized by comprising the following steps of: mixing the stainless steel dust, coal powder and limestone, then adding an adhesive for manufacturing green balls, adding the obtained green balls into a rotary hearth furnace, firstly oxidizing the green balls rotating along with a hearth through an oxidation zone in the rotary hearth furnace, then reducing the green balls through a high-temperature reduction zone in the rotary hearth furnace, finally reducing the green balls into high-temperature mature balls, discharging the mature balls out of the rotary hearth furnace, then naturally cooling, naturally powdering the slag in the cooled mature balls, naturally powdering iron slag, and sieving to obtain iron grains directly used for steelmaking. The method thoroughly changes a traditional process route, the atmosphere component control in the rotary hearth furnace is optimized by improving the proportion of raw materials, a product can be obtained through one-step smelting, the process route is simplified, the production energy consumption is also greatly reduced, the cost is greatly lowered, and the product is quite competitive.

Description

technical field [0001] The invention relates to a method for extracting high content of nickel, chromium and iron from stainless steel dust, which mainly uses a rotary hearth furnace to process the dust containing nickel, chromium and iron produced in the stainless steel production process to prepare iron particles. The pellets can be directly used in the steelmaking converter or electric furnace in the subsequent process, so as to achieve the purpose of recycling the precious metals contained in the dust. Background technique [0002] As the importance of environmental protection and comprehensive utilization of resources is increasingly recognized by people, the research on dust treatment technology in iron and steel plants has also become a hot spot in the metallurgical field. [0003] The production process of stainless steel includes ironmaking, steelmaking, hot rolling, cold rolling and public auxiliary facilities. With the continuous development of domestic stainless...

AI Technical Summary

Problems solved by technology

With the continuous development of domestic stainless steel production, more and more dust, metal dust, iron oxide powder, and waste are produced. A stainless steel plant with an annual output of 1 million tons produces dust containing nickel and chromium, and iron oxide scale. As much as 60,000 tons, my country's stainless steel output reached about 9 million tons in 2009 alone. After years of accumulation, if these wastes are not recycled, it will not only pollute the environment, increase the cost of foreign waste treatment, and increase the cost of enterprises, but also It also wastes the "resources" of steel mill waste

[0004] At present, the methods for dealing with these dusts containing nickel and chromium are either outdated in technology, high in energy consumption, and uneconomical, or the technology is feasible, but no good process control method has been found, and the processing capacity and reduction rate are not ideal, so further exploration is needed

Images