Sintering method for preparing boron ore powder

Abstract

The invention discloses a sintering method for preparing boron ore powder. The sintering method comprises the following steps: carrying out fine grinding on ore powder, namely, adding an aqueous polymer which accounts for 3-5% of the weight of boron ore powder, furfural residues which accounts for 10-20% of the weight of boron ore powder, a gallic acid which accounts for 0.3-0.5% of the weight of boron ore powder, and coal ash which accounts for 10-20% of the weight of boron ore powder, and uniformly mixing and carrying out fine grinding; (2) preparing spherulite; (3) sintering, namely, coating the surface of spherulite with a layer of fuel, feeding the spherulite into a sintering machine, allocating materials, wherein the material layer height is 600-700mm, an atomization spraying device is adopted to add moisture to the sintered mixed material in the allocation procedure of the sintering machine, a small water allocation amount is adopted to middle and upper allocated materials in the upper mixed material layer of the sintering machine, the moisture is 5-6%, a large water allocation amount is adopted in the lower allocated material of the material layer, and the moisture is 7-8%, drying, preheating, igniting and sintering to prepare sintered ore, and cooling, crushing and screening sintered ore, thereby obtaining a finished product sintered ore of which the granularity is 10-20mm. The method for preparing boron ore powder is simple in process, by fine grinding and activating boron ore powder, the reaction temperature can be reduced, an average heating method is adopted in the sintering procedure, the strength and the yield of sintering ore can be improved, and the consumption of solid fuel can be reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a sintering method for preparing boron 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. Boron ore powder is a kind of furnace charge. The current method of preparing boron ore powder has the problems of high solid fuel consumption, low energy utilization rate, poor sinter strength and low output. In the fine grinding process of boron ore powder, boron ore powder The grindability is very poor, and the fine particles are easy to agglomerate. The grinding process needs to consume a lot of energy and production time; and in the sintering process, after the surface of the material layer is ignited, as the sintering progresses, the solid fuel in the mixt...

AI Technical Summary

Problems solved by technology

Boron ore powder is a kind of furnace charge. The current method of preparing boron ore powder has the problems of high solid fuel consumption, low energy utilization rate, poor sinter strength and low output. In the fine grinding process of boron ore powder, boron ore powder The grindability is very poor, and the fine particles are easy to agglomerate. The grinding process needs to consume a lot of energy and production time; and in the sintering process, after the surface of the material layer is ignited, as the sintering progresses, the solid fuel in the mixture burns The heat generated 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 temperature and heat increase as the material layer goes down. The wider the high-temperature zone, the sintering process is a non-isothermal process, and the maximum temperature migration velocity and the thickness of the combustion zone in the sintering material layer have a great influence on the sintering process and product quality. For example, after the material layer is thickened , the amount of solid fuel is relatively reduced, the upper material layer of sintering is insufficient in heat, which leads to the deterioration of the strength of sintering ore, the decline of yield, the inhomogeneity of finished sintering ore, the increase of powder return rate in the production system, and the deterioration of sintering process conditions, etc.