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Method and system for preparing 4N-grade high-purity iron

A high-purity, pure iron technology, applied in the field of preparation of 4N-grade high-purity iron and systems, can solve the problem that it is difficult to reduce metal impurities, and achieve the effect of expanding the reaction area

Pending Publication Date: 2022-07-01
河北龙凤山铸业有限公司 +1
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  • Claims
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Problems solved by technology

However, the hydrogen plasma arc melting method is difficult to reduce metal impurities similar to the main metal in physical properties and impurities with low vapor pressure. The removal of these impurities requires a suitable chemical purification process

Method used

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  • Method and system for preparing 4N-grade high-purity iron

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Embodiment

[0039] Example: [1] Prepare electrolytic iron samples, each weighing about 10kg, and put them into the left chamber of the high-purity iron refining furnace; [2] Turn on the circulating cooling water, and check that the cooling pipes are unobstructed; [3] Turn on the mechanical Pump, when the vacuum degree in the furnace is less than 500Pa, start the Roots pump, and after the vacuum degree continues to decrease to 1Pa, start the diffusion pump until the vacuum degree in the furnace reaches 3×10 -3 Pa; [4] Start the feeder, turn on the induction power switch at the same time, melt the electrolytic iron in the water-cooled copper crucible, and observe the melting situation and liquid level of the liquid surface through the observation hole on the furnace, and wait until the liquid level rises to the upper edge of the crucible At 2cm, start the pulling system and start directional solidification; [5] By adjusting the feeding amount, the induction power power and the pulling speed ...

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Abstract

According to the method and system for preparing the 4N-grade high-purity iron, the purity of 4N is 99.99 wt%-99.999 wt%, a cold-wall vacuum induction refining furnace and a hydrogen plasma drop melting refining furnace are connected to the same vacuum system, a 2N or 3N electrolytic pure iron raw material can be heated and melted, then a vacuum refined iron rod is generated in a directional drawing and solidifying mode, and the 4N-grade high-purity iron is obtained. Then the vacuum refined iron rod is gradually melted into molten drops through hydrogen plasma arc, and then the 4N-grade high-purity iron rod is generated in a directional drawing solidification mode, other refining agents do not need to be added into the melt, a ceramic crucible is omitted, waste residues are not generated in the production process, and the method has the advantages of being simple in process, easy to operate, capable of saving energy, environmentally friendly, low in cost and the like.

Description

technical field [0001] The invention relates to high-purity iron technology, in particular to a method and system for preparing 4N-grade high-purity iron. The 4N refers to a purity of 99.99-99.999wt%. A vacuum system that can heat and melt 2N or 3N electrolytic pure iron raw materials to generate vacuum refining iron rods by directional pulling and solidification, and then gradually melt the vacuum refining iron rods into molten droplets through a hydrogen plasma arc. The 4N-grade high-purity iron rod is produced by directional drawing and solidification, without adding other refining agents to the melt, eliminating the need for ceramic crucibles, and producing no slag during the production process. It has the characteristics of simple process, easy operation, energy saving and environmental protection, and low cost. Background technique [0002] When the content of other impurity elements in iron is extremely low, it is pure iron. Pure iron can be divided into 2N industria...

Claims

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Application Information

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IPC IPC(8): C22B9/00C22B9/04C22B9/05C22B9/20
CPCC22B9/003C22B9/04C22B9/20C22B9/05
Inventor 白佳鑫董瀚韦习成余建波白鹏十翰李建民郝建锋于华财王俊鹏
Owner 河北龙凤山铸业有限公司
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