Method for smelting chromium-containing ferronickel through laterite nickel ore

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 ...

AI Technical Summary

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