Raw materials for the electrode paste into the nickel-iron submerged arc furnace
Raw materials analysis and market conditions of nickel-iron submerged arc furnace using high-standard closed paste electrode paste
The domestic nickel oxide ore resources are extremely limited. At present, the domestic laterite resources for the production of nickel pig iron and ferronickel with high-standard airtight electric furnaces come from South Pacific island countries such as Indonesia and the Philippines. Enterprises purchase nickel ore from the market according to suitable production processes and equipment conditions.
The purchased laterite ore usually contains about 33% of the physical water and crystal water. It is extremely uneconomical to directly charge nickel ore into a high-standard closed paste electric furnace to smelt ferronickel. Inefficient and useless to use large amounts of heat. At present, the domestic enterprises engaged in smelting ferronickel with electrode paste electric furnaces almost all dry laterite ore. It is more economical to bake laterite ore with the waste heat of a closed paste electric furnace to remove the physical water in the ore.
The most ideal treatment technology for laterite ore should be pre-reduction. Usually, the dried laterite ore is mixed with the reducing agent coal or coke to form agglomerates, which is pre-reduced in a rotary kiln to reduce nickel oxide and iron oxide to nickel, as well as the reduced sintering material of partial residual low-order iron oxide, and It is charged into the electrode paste electric furnace in the red hot state, or the nickel-iron metal particles selected in the cold state are added to the electric furnace, and smelted and processed into stainless steel. Consider from the technical and economic indicators of continuous improvement of production. The technical level of the pre-reduction treatment is moderately high. The better the quality of the ferronickel produced by the closed paste electric furnace smelting, the lower the power consumption and the higher the efficiency. The better the economic benefits.