A kind of method for producing ferronickel by adding nickel sulfide concentrate to laterite ore

Abstract

The invention discloses a method for producing ferronickel by adding nickel sulfide concentrate in laterite. The method comprises the following steps: a, performing roasting pretreatment on the nickel sulfide concentrate; b, mixing pretreated nickel sulfide concentrate, dried laterite and reduced coal, and performing roasting pre-reduction on the mixture, wherein the temperature of an exit high-temperature roasted sand is 650-750 DEG C; due to the addition amount of the nickel sulfide concentrate, in the mixed total ore, the content of S is less than and equal to 0.2%, and the content of As is less than and equal to 0.005%; c, adding 650-750 DEG C high-temperature roasted sands to a submerged arc furnace and smelting to obtain a ferronickel product; controlling the melting point of slag to be 1480-1500 DEG C, controlling the content of SiO2 in the slag to be 50-53%, the content of MgO in the slag to be 27-30% and the content of FeO in the slag to be 8-11%. According to the method for producing the ferronickel by adding the nickel sulfide concentrate in the lateritic, the nickel sulfide concentrate replaces a part of lateritic to produce the ferronickel, the production is smooth, the quality of the ferronickel is qualified, and a new ideal and method is provided for the comprehensive utilization of nickel-containing resources; the economical benefits and social benefits are achieved.

Description

technical field [0001] The invention belongs to the field of ferroalloy production, and in particular relates to a method for producing ferronickel by adding nickel sulfide concentrate to laterite ore. Background technique [0002] Ferronickel is an important raw material for the production of stainless steel and heat-resistant cast steel, etc. Adding nickel to steel can improve the corrosion resistance of steel, improve the tensile strength, cold deformation and welding performance of steel, and is widely used in machinery, medical, national defense, Light industry and other fields. At present, nickel provided by ferronickel has accounted for more than 50% of the world's nickel demand, and my country has reached more than 75% in 2013, and the proportion will increase. [0003] There are two types of nickel resources available for the production of ferronickel in the world, one is nickel sulfide ore; the other is nickel oxide ore, which is also called laterite ore because o...

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Problems solved by technology

[0005] There are two main methods for the utilization of nickel sulfide ore in my country: one is to use electric furnace, blast furnace, flash furnace to smelt low-nickel matte, and then wet extract the precious metals such as Cu and Co in it, and then produce nickel plate by electrolysis; the other is to directly Pressurized leaching and electrolysis of the leaching solution are used to produce nickel plates. The former uses a combination of fire and wet methods to produce nickel plates, and the recovery rate of nickel is low; the latter uses only wet processes to produce nickel plates, with low production capacity and high energy consumption.

So far, no nickel sulfide ore has been directly used for pyrometallurgy to produce ferronickel. The main reason is that the content of sulfur, arsenic and other impurity elements in nickel sulfide ore is high, which leads to high content of sulfur and arsenic in ferronickel products, which cannot reach the product level. Quality requirements, and the content of magnesium oxide and silicon dioxide is low, making slag difficult, resulting in low nickel recovery rate and high production cost

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