High-temperature sintering technology for nickel mineral powder

Abstract

The invention discloses a high-temperature sintering technology for nickel mineral powder. The nickel mineral powder is composed of raw materials including, by weight percent, 35%-50% of the nickel mineral powder, 8%-10% of carbon powder, 10%-15% of iron powder, 0.6%-3% of a bonding agent, 3%-5% of fuel and 8%-15% of a fluxing agent. Compared with the prior art, the high-temperature sintering technology has the beneficial effects that a sintering method for the nickel mineral powder is simple in technological method and convenient to operate, additives such as waterborne macromolecules, furfural residues and coal ash are added in the fine grinding stage of the nickel mineral powder, an obvious grinding assisting effect is achieved, the activity of the mineral powder is effectively excited, and the reaction temperature of the mineral powder is reduced. Meanwhile, a segmented heating method is adopted in the high-temperature sintering process, the strength of sintered ore is improved, the yield of the sintered ore is increased, and consumption of solid fuel is reduced.

Description

technical field [0001] The invention relates to the technical field of ore powder sintering, in particular to a high-temperature sintering process of nickel ore powder. Background technique [0002] Furnace charge refers to the ore and other catalytic materials that are added to the smelting furnace. Iron ore, steel billet, pig iron, scrap iron and steel, ore powder, coking coal, and ferroalloy all belong to the charge. Nickel ore powder is a kind of furnace charge. The current method of preparing nickel ore powder has the problems of high solid fuel consumption, poor sinter strength, low ball forming performance, air permeability that cannot meet the application requirements of blast furnaces, and low output. In the fine grinding process of ore powder, nickel ore powder has poor grindability and fine particles are easy to agglomerate. The grinding process consumes a lot of energy and production time; and in the sintering process, after the surface of the material layer is i...

AI Technical Summary

Problems solved by technology

Nickel ore powder is a kind of furnace charge. The current method of preparing nickel ore powder has the problems of high solid fuel consumption, poor sinter strength, low ball forming performance, air permeability that cannot meet the application requirements of blast furnaces, and low output. In the mineral powder fine grinding process, the nickel ore powder has poor grindability, and the fine particles are easy to agglomerate. The grinding process consumes a lot of energy and production time; and in the sintering process, after the surface of the material layer is ignited, along with During the sintering process, the heat generated by the combustion of solid fuel in the mixture is transferred from the upper part of the material layer to the lower part, and the temperature of the material layer shows a trend of gradually increasing from top to bottom. The concentrated combustion of fuel and the automatic heat storage of the sinter layer make the material layer more and more The higher the temperature, the more heat, and the wider the high temperature zone, so the sintering process is a non-isothermal process, and the maximum temperature migration speed in the sintering material layer and the thickness of the combustion zone have a great influence on the sintering process and product quality. Big impact, such as after the thickening of the material layer, the amount of solid fuel is relatively reduced, the sintering upper material layer is insufficient in heat, which leads to the deterioration of the strength of the sintered ore, the decline of the finished product rate, the inhomogeneity of the finished sintered ore, and the increase of the powder return rate of the production system. Deterioration of sintering process conditions, etc.