Desulfuration refining process of high-sulfur crude ferronickel

A coarse nickel and high sulfur technology, applied in the field of metallurgical production, can solve the problems of high energy consumption, and achieve the effects of low power consumption, low cost and convenient transportation

Active Publication Date: 2011-05-18
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process also belongs to the scope of electric furnace desulfurization, and needs to invert the tank, so it consumes a lot of energy

Method used

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  • Desulfuration refining process of high-sulfur crude ferronickel
  • Desulfuration refining process of high-sulfur crude ferronickel
  • Desulfuration refining process of high-sulfur crude ferronickel

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Refer below figure 2 The desulfurization and refining process of the high-sulfur crude ferronickel according to Example 1 of the present invention is described.

[0053] The crude ferronickel melt obtained from electric furnace smelting is in reducing atmosphere, suitable for desulfurization treatment. Specifically, the desulfurization process steps are as follows.

[0054] Step 1: First, provide a high-sulfur coarse ferronickel melt with an initial temperature above 1450°C. Specifically, the high-temperature high-sulfur coarse nickel-iron melt obtained by electric furnace smelting can be used, and the initial temperature obtained by electric furnace smelting is above 1450°C. In the iron tank 1, the nickel-iron tank 1 containing the thick nickel-iron melt is moved to the refining station by the nickel-iron tank moving device 2 thereafter. Thus, high-temperature high-sulfur coarse ferronickel can be directly refined, thereby saving steps such as heating and saving en...

Embodiment 2

[0086] Refer below image 3 The desulfurization and refining process of high-sulfur crude ferronickel according to Example 2 of the present invention is described.

[0087] The main difference between this embodiment and the above-mentioned embodiment 1 is that, according to the specific situation of the phosphorus content contained in the crude ferronickel raw material, after desulfurization and refining, the phosphorus impurities contained therein are further dephosphorized.

[0088] Specifically, first, desulfurization was performed in the same manner as in Example 1. When the sulfur content meets the product requirements, a compound dephosphorization agent is further added to the desulfurized melt for dephosphorization.

[0089] Since part of the phosphorus contained in it has been removed through the reaction formula (8) and (9) during the desulfurization process, in the next dephosphorization process, in addition to CaO, CaCO 3 , CaF 2 In addition, ferrous oxide scale...

Embodiment 3

[0097] Refer below Figure 4 The desulfurization and refining process of the high-sulfur crude ferronickel according to Example 3 of the present invention is described. The main difference between this embodiment and embodiment 2 is that the raw material used is the coarse ferronickel obtained by sintering and rough refining of lateritic nickel ore.

[0098] Specifically, first, mix laterite nickel ore with coal powder or coke powder in a weight ratio of 90:10-95:5, and then use a rotary kiln to sinter at 600-1000°C for 2-8 hours to obtain sintered nickel ore. Thereafter, the sintered nickel ore, flux and reducing agent are put into an electric furnace and smelted at 200V-300V for 1-3 hours to obtain crude ferronickel. Then, the high-sulfur crude ferronickel produced by the electric furnace was poured into the nickel-iron tank, and refined in the same manner as in Example 2, so as to obtain refined ferronickel.

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Abstract

The invention discloses a desulfuration refining process of high-sulfur crude ferronickel. The desulfuration refining process comprises the following steps of: (1) providing a fusant of the high-sulfur crude ferronickel with an initial temperature of more than 145 DEG C; (2) adding a composite desulfurizer to the fusant and introducing a high pressure gas from the bottom for stirring; (3) detecting sulfur content of the fusant, stopping desulfurating when the sulfur content of the fusant is below a predetermined value, detecting the temperature of the fusant when the sulfur content of the fusant is above the predetermined value, slagging off, raising the temperature of the fusant and repeating the step (2) until the sulfur content is below the predetermined value when the temperature is below 1350 DEG C, repeating the step (2) until the sulfur content is below the predetermined value when the temperature is above 1350 DEG C, and slagging off to obtain a refined ferronickel alloy fusant; and (4) casting and cooling the refined ferronickel alloy fusant and demoulding to obtain a refined ferronickel alloy. The desulfuration refining process of the high-sulfur crude ferronickel, whichis disclosed by the embodiment of the invention, can be used for removing high-content sulfur with low energy consumption.

Description

technical field [0001] The invention relates to the technical field of metallurgical production, in particular to a desulfurization and refining process for high-sulfur coarse ferronickel. Background technique [0002] As we all know, nickel is an important alloying element in the metallurgical industry. Due to the unique properties of nickel metal, it is widely used in the production of stainless steel, special alloy steel, nickel plating, ceramic products, battery catalysts and many other fields. Nickel alloy Materials play a very important role in national economic construction and national defense military construction. [0003] With the wide application of stainless steel and special steel in the world, the supply of nickel metal, the most important element of metallurgical stainless steel and special steel, is in short supply, causing the price to soar. At present, more than 60% of the world's nickel products come from sulfide ores, and more than 60% of the world's ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C22C35/00C22C38/08C22C33/04
Inventor 梁帅表李曰荣黎敏
Owner CHINA ENFI ENGINEERING CORPORATION
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