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Method for smelting chromium-containing ferronickel through laterite nickel ore

A technology of laterite nickel ore and ferronickel, which is applied in the field of iron and steel metallurgy, can solve the problems of reducing the metal recovery rate, low chromium content in ferronickel, deteriorating smelting performance, etc. The effect of chromium recovery

Active Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Affected by the poor endowment of lateritic nickel ore raw materials, the production of ferronickel has problems such as low metal recovery rate and environmental pollution, especially the poor recovery of chromium metal (about 10%), which not only causes waste of resources, but also has low chromium content in ferronickel. A large amount of ferrochromium raw materials need to be added during refining; in addition, during the smelting process of ferronickel, high melting point chromium oxides enter the slag and deteriorate the smelting performance, resulting in difficulty in the separation of slag and iron, reducing the metal recovery rate; on the other hand, due to the amount of slag discharged Large (the amount of slag discharged per unit of ferronickel smelting is more than 10 times that of pig iron smelting), low comprehensive utilization (about 10%), and a large amount of chromium-containing ferronickel slag is in a stockpiled state, bringing potential environmental pollution hazards

Method used

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Embodiment 2

[0043] The laterite nickel ore is mixed with nickel sulfide ore accounting for 5% of its mass, the amount of chromite and stainless steel pickling sludge and stainless steel dust accounts for 5% of the laterite nickel ore, and the amount of desulfurized gypsum and steel slag accounts for 5% of the laterite nickel ore. 6% of the quality of nickel ore; after adding the above materials, the sulfur content in the mixed material is 2%, the calcium oxide content is 5%, the aluminum oxide content is 6%, the mass ratio of magnesium oxide to silicon oxide is 0.64, and the fluoride content is 1.5%, FeO content in slag is 8%. According to the general technological process of rotary kiln-electric furnace smelting ferronickel, after the above materials are mixed and dried, semi-coke accounting for 6% of the mass of laterite nickel ore is added as a reducing agent; it enters the rotary kiln for pre-reduction at 800°C, and the calcined sand is hot-charged into the electric furnace , the smel...

Embodiment 3

[0045] Nickel sulfide ore accounts for 5% of the laterite nickel ore, chromite and stainless steel pickling sludge and stainless steel dust account for 6% of the laterite nickel ore, and desulfurized gypsum and steel slag account for 6% of the laterite nickel ore. 8% of the quality of nickel ore; after adding the above materials, the sulfur content in the mixed material is 2.5%, the calcium oxide content is 6%, the aluminum oxide content is 6%, the mass ratio of magnesium oxide to silicon oxide is 0.64, and the fluoride content is 1.7%, FeO content in slag is 13%. After the above-mentioned mixed material is dried in a drying kiln, semi-coke accounting for 6% of the mass of laterite nickel ore is added as a reducing agent; the mixed material is put into a rotary kiln for pre-reduction at 800°C, and the calcine is hot-charged into an electric furnace at a melting temperature of 1580°C. The total metal content in the chromium-inconel product is 97%, of which the metal chromium co...

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Abstract

The invention discloses a method for smelting chromium-containing ferronickel through laterite nickel ore. Nickel sulphide ore, a chromium-containing material and stainless steel smelting waste slag with a certain proportion are added into the laterite nickel ore, a rotary kiln pre-reduction-electric furnace process is adopted for smelting, a chromium-containing ferronickel product is used for producing 300-series austenitic stainless steel, the nickel sulphide ore and the chromium-containing material can serve as a part of a nickel source and a chromium source to improve the nickel and chromium grade in an alloy smelting product, other components in the nickel sulphide ore and the chromium-containing material are matched with multiple components in other stainless steel smelting waste slag to serve as a slag forming constituent to adjust the furnace slag smelting property, the reduction condition of chromium oxides can be improved, and separation of metal and slag can be reinforced. The method can improve the chromium grade and the chromium recycling rate in the ferronickel product, the smelting energy consumption can be greatly reduced, multiple metallurgical waste slag in the stainless steel production process can be sufficiently used, secondary resource recycling can be achieved, enterprise production cost is reduced, and the environment pollution brought by the metallurgical waste slag can be removed.

Description

technical field [0001] The invention discloses a method for smelting chromium-nickel iron with laterite nickel ore, belonging to the technical field of iron and steel metallurgy. Background technique [0002] Stainless steel is an important high-end material for the national economy and national defense construction. my country's stainless steel production and consumption have ranked first in the world for many years. According to statistics, my country's stainless steel production reached more than 26 million tons in 2018, of which 200 series and 300 series stainless steels dominated by nickel-based stainless steel accounted for 80%. [0003] Traditional nickel-based stainless steel production mainly uses electrolytic nickel prepared from nickel sulfide ore as the nickel source. As the global nickel sulfide ore resources are increasingly depleted, it has been unable to meet the growing demand for nickel production. Compared with nickel sulfide ore, laterite nickel ore is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/10C22B23/02C22B34/32C22B1/11C22C35/00
CPCC22B1/11C22B5/10C22B23/02C22B34/32C22C35/00Y02P10/20
Inventor 罗骏李光辉姜涛饶明军彭志伟张鑫
Owner CENT SOUTH UNIV
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