Nickel iron smelting technique by laterite nickel ore

Abstract

The invention relates to a technology for smelting ferronickel from lateritic nickel ore by an electric furnace. The technology comprises the steps as follows: (1) raw material is pretreated: the lateritic nickel is counted as one ton, coal powder with the weight of 8-12 percent of the weight of the lateritic nickel or coke powder with the weight of 6-10 percent of the weight of the lateritic nickel is added into the lateritic nickel to be mixed uniformly and returned to a rotary kiln to be sintered at the temperature of 600 DEG C to 1000 DEG C for 3 to 6 hours, wherein, the pre-reduction of 20-30 percent of NiO is achieved; (2) the raw material is put into a submerged arc furnace to be smelted: an electric furnace magnesia and carbon mixture furnace lining is arranged; adjustable electric furnace voltage is set with the high voltage of 280-300V and the low voltage of 200-220V, and that is the high voltage starts arc, and after 30 minutes, the electric furnace is changed to low voltage for smelting and calcining an electrode; the charge of smelting furnace charging material consists of one ton of sintered nickel and 90-120kg of fusing agent lime; coke or coal is added as a reducer; the raw material and the auxiliary material are put into the electric furnace to be smelted; and (3) crude ferronickel is refined: liquid molten iron is put into a finery, and a refining agent is added for refining by oxygen blast. A product contains more than 13 percent of nickel, thereby satisfying the requirement of producing high-quality steel material product; and the recovery rate of nickel element is more than 95 percent. The technology has simple technology, saves energy and has high efficiency.

Description

technical field [0001] The invention relates to an electric furnace smelting process, in particular to a laterite nickel ore electric furnace smelting ferronickel process. Background technique [0002] As we all know, China is a country short of nickel resources, and needs to import a large amount of ferronickel and nickel plates from abroad every year to meet the needs of domestic stainless steel and other industries. Especially in recent years, with the increase of domestic stainless steel production, the demand for ferronickel and nickel plates is also increasing. However, except for Jinchuan, China has no large-scale production of nickel plates, and the production of nickel plates Nickel sulfide ore resources are nearly exhausted, so the price of nickel plates is very expensive, making the cost of stainless steel high. Foreign countries, especially Japan and Ukraine, which have the largest output of stainless steel, use cheap laterite nickel ore submerged arc furnaces t...

AI Technical Summary

Problems solved by technology

[0004] In the past, ferronickel was produced by sulfide ore water method or fire method in China. Since 2005, laterite nickel ore has been used to produce ferronickel. So far, there have been dozens of ferronickel manufacturers in China, but there are still some problems in production technology. Many problems are manifested in the fact that the impurity content of the product is relatively high and the composition is unstable; especially the service life of the electric furnace lining is relatively short, usually no more than two months, which not only affects the quality of the product but also increases the production cost; due to the above reasons , China has not formed a complete ferronickel production process so far, and there is still a big gap between the electric furnace smelting index and foreign countries