Process for increasing nickel yield in ferronickel production

Abstract

The invention discloses a process for increasing the nickel yield in ferronickel production. The process comprises the following steps: preparing a furnace burden, adding bottom slag, charging and melting, blowing oxygen and dephosphorizing, adding a composite flux, discharging and casting to obtain ferronickel alloy. The added composite flux is prepared from the following components in percentageby weight: 30 to 40 percent of coke powder, 20 to 30 percent of quartz, 30 to 35 percent of calcium oxide and 5 to 10 percent of magnesium oxide; and after the composite flux is added, the furnace temperature needs to be increased to 1600-1680 DEG C for slag adjustment, and slag is taken out of the furnace after slag adjustment is completed. By adding the composite flux composed of the coke powder, the quartz, the calcium oxide and the magnesium oxide, the furnace temperature can be effectively increased, the slag viscosity can be reduced, nickel metal sedimentation can be promoted, the nickel content in ferronickel can be increased, and the adding amount of finished nickel metal can be reduced; the nickel recovery rate of the process can reach 98.5% or above, and the unit cost of ferronickel production is reduced by 20% or above.

Description

technical field [0001] The invention relates to the technical field of ferronickel production, in particular to a process for improving the nickel yield in ferronickel production. Background technique [0002] The main use of nickel is to manufacture stainless steel, high-nickel alloy steel and alloy structural steel, which are widely used in various military manufacturing industries such as aircraft, radar, missiles, tanks, ships, spacecraft, atomic reactors; in civilian industries, nickel is often Made of structural steel, acid-resistant steel, heat-resistant steel, etc., it is widely used in machinery manufacturing and petroleum industry; nickel and chromium, copper, aluminum, cobalt and other elements can form non-ferrous alloys. Nickel-based alloys and nickel-chromium-based alloys are high-temperature-resistant and oxidation-resistant materials, which are used to manufacture jet turbines, resistors, electric heating elements, high-temperature equipment structural parts,...

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of my country's stainless steel industry, the disadvantage of my country's lack of nickel resources is further exposed. my country's booming stainless steel industry must face these two problems: First, the current pricing power of the nickel market is not in my country, and the domestic spot nickel price basically follows the LME Nickel fluctuations; second, the gradual reduction of global nickel sulfide ore resources and the increase in mining difficulty will inevitably push up the production cost of electrolytic nickel, and the cost of stainless steel smelting will inevitably rise

If the production process is not further improved, the loss will be great

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