Method for Ni-Fe alloy production and Sn recovery from Ni-Sn ferroalloy scrap by high-sulfur coal sulfuration volatilization and oxidation slagging

A technology of nickel-iron alloy and high-sulfur coal, which is applied in the field of comprehensive utilization of secondary resources, can solve the problems of low utilization rate and poor economic performance, and achieve the effects of low production cost, simple operation and low furnace maintenance cost

Inactive Publication Date: 2014-12-24
GLOBE FUTURE BEIJING TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current utilization method of this alloy waste is to add it as an alloy element additive in the alloy production process after classification, and the utilization rate is low and the economic performance is poor.

Method used

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  • Method for Ni-Fe alloy production and Sn recovery from Ni-Sn ferroalloy scrap by high-sulfur coal sulfuration volatilization and oxidation slagging
  • Method for Ni-Fe alloy production and Sn recovery from Ni-Sn ferroalloy scrap by high-sulfur coal sulfuration volatilization and oxidation slagging
  • Method for Ni-Fe alloy production and Sn recovery from Ni-Sn ferroalloy scrap by high-sulfur coal sulfuration volatilization and oxidation slagging

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Nickel-tin-iron alloy waste (the main chemical composition is (unit: mass fraction): TFe=31.39, Ni=50.24, Sn=18.37) 5t was crushed to a certain degree and then transferred to the intermediate frequency furnace. The intermediate frequency furnace is heated to 1400°C and when the material is in a molten state, the nitrogen spray gun is deep into the molten pool to stir the reaction system. Mass fraction): fixed carbon = 76.56, ash = 15.39, volatile matter = 4.78, S = 3.27) crushed to a particle size of 0.2-0.4mm, and sprayed into the molten pool by a spray gun to carry out the volatilization and volatilization reaction of tin in the material. As the reaction progresses, the position of the nitrogen spray gun is raised intermittently to achieve the best stirring effect on the molten pool. The nitrogen injection pressure is maintained at 0.4-0.8MPa, and the furnace temperature is controlled at 1450-1500°C. After the vulcanization reaction is completed (the holding time is 6...

Embodiment 2

[0031] Nickel-tin-iron alloy waste (the main chemical composition is (unit: mass fraction): TFe=32.08, Ni=50.37, Sn=17.55) 5t is transferred to the intermediate frequency furnace after crushing to a certain degree. The intermediate frequency furnace is heated to 1400°C and when the material is in a molten state, the nitrogen spray gun is inserted into the molten pool to stir the reaction system. After the furnace is heated to 1500°C and kept for 20 minutes, the high-sulfur coal (its main chemical composition is Mass fraction): fixed carbon = 76.96, ash = 15.69, volatile matter = 5.28, S = 4.17) crushed to a particle size of 0.2-0.4mm, and sprayed into the molten pool by a spray gun to carry out the volatilization and volatilization reaction of tin in the material. As the reaction progresses, the position of the nitrogen spray gun is raised intermittently to achieve the best stirring effect on the molten pool. The nitrogen injection pressure is maintained at 0.9-1.1MPa, and the ...

Embodiment 3

[0033] Nickel-tin-iron alloy waste (the main chemical composition is (unit: mass fraction): TFe=28.93, Ni=54.38, Sn=16.69) 3t was crushed to a certain degree and then transferred to the electric furnace. The electric furnace is heated to 1300°C and when the material is in a molten state, the nitrogen spray gun is deep into the molten pool to stir the reaction system. After the furnace is heated to 1400°C and kept for 30min, the high-sulfur coal (its main chemical composition is Score): fixed carbon = 73.28, ash = 17.02, volatile matter = 5.23, S = 4.47) crushed to a particle size of 0.2-0.4mm, and sprayed into the molten pool by a spray gun to carry out the volatilization and volatilization reaction of tin in the material. As the reaction progresses, the position of the nitrogen spray gun is raised intermittently to achieve the best stirring effect on the molten pool. The nitrogen injection pressure is maintained at 0.15-0.3MPa, and the furnace temperature is controlled at 1400...

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Abstract

The invention discloses a method for Ni-Fe alloy production and Sn recovery from Ni-Sn ferroalloy scrap by high-sulfur coal sulfuration volatilization and oxidation slagging. The method is characterized by comprising the process steps as follows: the Ni-Sn ferroalloy scrap is crushed to certain blockness, transferred into an intermediate frequency furnace or an electric furnace and then heated to certain temperature, a nitrogen gas spray gun is inserted into a molten pool for stirring after the material is in a molten state, and the high-sulfur coal is crushed to certain granularity and sprayed into the molten pool for a sulfuration volatilization reaction of Sn in the material; after the sulfuration reaction is finished, the high-sulfur coal is stopped from being sprayed into the furnace, certain slagging constituent is added into the molten pool for Ni-Fe liquid purification, and certain alkalinity of the molten pool is controlled in the process; after certain period, slag and Fe are completely separated, produced Ni-Fe liquid and slag are discharged from a Fe outlet and a slag outlet respectively, and resources including Ni, Fe and Sn are recovered effectively in the process. According to the method, the characteristic of high sulphur content of the high-sulfur coal is sufficiently utilized for Sn sulfidation treatment of the Ni-Sn ferroalloy scrap, the resources including Ni, Fe and Sn are recovered effectively, waste is treated by waste, the technological process is simple to operate, the production cost is lower, and broader industrial prospect is provided.

Description

technical field [0001] The invention relates to a method for volatilizing high-sulfur coal nickel-tin-iron alloy waste and oxidizing slagging to produce nickel-iron alloy and recovering tin, which belongs to the field of comprehensive utilization of secondary resources. Background technique [0002] China's nickel supply consists of two parts, one part is the supply of newly produced nickel concentrate, which accounts for 72.9% of the total nickel supply, and the other part comes from secondary nickel, which accounts for 27.1%. With the development of economic construction and steel industry, nickel's The demand is constantly increasing. After China's nickel consumption is expected to reach 400,000 tons per year in 2010, China will become the world's largest nickel consumer. In 2010, the basic reserves of nickel metal in China were only about 2.3 million tons. From 2010 to 2013, there was no significant progress in China's nickel ore exploration. If consumption continues li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B25/06C21B11/10C22C1/02C22C19/03C22C33/04C22C38/08
CPCY02P10/20
Inventor 朱海涛
Owner GLOBE FUTURE BEIJING TECH DEV CO LTD
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