Method for smelting molten nickel iron with low cost and high productivity

Abstract

The invention discloses a method for smelting molten nickel iron with low cost and high productivity, and relates to the technical field of ferrous metallurgy. The method comprises the following steps of S1, crushing and mixing, specifically, crushing and screening large laterite-nickel ore heads, and mixing and stirring to uniformly mix the large laterite-nickel ore heads; S2, drying, specifically, drying the raw ore in the step S1 by using a dry kiln, and controlling the moisture of the raw ore to be 23-26%; S3, proportioning, specifically, proportioning the raw ore to meet the following requirements that the charging grade is 1.45-1.64%, the proportioning iron TFe is 18.5-20%, the silicon-magnesium ratio Si / Mg is 1.50-1.55, and the basicity of slag R is 0.65; S4, calcining, specifically, calcining the raw material proportioned in the step S3 in a rotary kiln to enable the raw material to be calcined into clinker, so as to obtain red hot roasted ore; and S5, smelting, specifically, smelting the roasted ore in a submerged arc furnace to obtain a qualified molten nickel iron product. According to the method, the service life and safety of the refractory can be guaranteed, the productivity can be increased, the production efficiency can be improved, and the production cost can be comprehensively controlled.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for smelting molten nickel iron with low cost and high production capacity. Background technique [0002] As an important strategic metal, nickel has become a key material in modern aviation, national defense and other industries because of its good ductility, strong toughness, good high temperature performance and oxidation and corrosion resistance. It is widely used in stainless steel, alloy steel, electroplating materials, batteries and other fields. Among them, stainless steel occupies a dominant position in the consumption ratio of nickel, accounting for about 68% of the global nickel consumption ratio. [0003] Laterite nickel ore has the advantages of abundant reserves and low mining difficulty. With the continuous improvement of its processing technology, it has become the main raw material for nickel production. Laterite nickel ore is divided...

AI Technical Summary

Problems solved by technology

[0005] 1. The parameters of the submerged arc furnace transformer are unreasonable, so that the current power can only be used up to 29500KVA, and the load increase is limited, which restricts the further increase of production capacity;

[0006] 2. The electrical parameters are unreasonable, and the smelting pool shrinks, causing fluctuations in furnace conditions and large fluctuations in smelting slag temperature;

[0007] 3. The refractory material of the submerged arc furnace body has different degrees of erosion, which restricts the maximization of power improvement and safe production;

[0008] 4. At present, the daily production capacity of similar processes is low, the heat loss is large in the production process, and the power consumption of smelting is high, resulting in high manufacturing costs;

[0009] 5. Due to the instability of raw materials, the stability of smelting in the furnace is insufficient;

[0010] 6. The coal feeding equipment of the rotary kiln is limited, and it cannot meet the existing high kiln speed and large feeding with coal for heating, resulting in insufficient material supply to the rotary kiln, which cannot meet the materials used for the submerged arc furnace;

[0011] 7. When the rotary kiln realizes the production of large kiln speed and large material feeding, it will be restricted by insufficient air distribution and insufficient oxygen demand, resulting in the phenomenon of "ringing" and "running out of coal" due to incomplete combustion of pulverized coal;

[0012] 8. After the feed rate of the rotary kiln is increased, due to the limitation of the coal feeder, the calcined sand temperature is unstable, and the situation of "ringing" and "running coal" occurs, which affects the production rhythm of the whole line

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