Method for preparing silicon-vanadium-iron alloy by use of copper slag and waste slag of high-vanadium iron production

Abstract

The invention discloses a method for preparing a silicon-vanadium-iron alloy by use of copper slag and waste slag of high-vanadium iron production. The method comprises the following steps: (1) raw material preprocessing, namely performing ball milling on the copper slag until the granularity is 50-80 meshes; grinding and performing ball milling on the waste slag of the high-vanadium iron production until the granularity is 50-80 meshes, adding sodium carbonate accounting for 6.5-7.5% of the weight of the waste slag and magnesium sulfate accounting for 2.5-3.5% of the weight of the waste slag, mixing, and roasting for 5-7 hours at 800-1000 DEG C, thereby obtaining the clinker of the waste slag of the high-vanadium iron production; performing ball milling on bituminous coal until the granularity is 50-80 meshes; (2) pelleting, namely weighing the raw materials, namely the copper slag, the waste slag of the high-vanadium iron production and the bituminous coal, in the weight ratio of (30-45wt%): (25-45wt%) and (20-30wt%); adding paper pulp waste liquid accounting 15-20wt% of the weight of the raw materials, mixing for pelleting, and then drying; (3) smelting, namely smelting the dried pellets, controlling the temperature of the smelt within the range of 1600-2000 DEG C in the smelting process, and cooling to obtain the silicon-vanadium-iron alloy. According to the method, the compound wastes of the copper slag and the waste slag of the high-vanadium iron production are taken as the major raw materials and the proportions of the raw materials are reasonably adjusted to prepare the silicon-vanadium-iron alloy; as a result, the production cost of the silicon-vanadium-iron alloy can be reduced; the raw materials are rich; the wastes are changed into things of value, and the environmental pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of ferroalloy preparation, in particular to a method for preparing ferro-silicon vanadium by using copper slag and waste slag from producing high-vanadium ferroalloy. Background technique [0002] The most important technology in the iron and steel industry in recent years is the development and application of microalloying technology for iron and steel materials. Commonly used microalloying elements are niobium, vanadium, titanium, etc., which are usually added in the form of carbides or nitrides. From an economic point of view, there are also direct additions to silicon vanadium ferroalloys or silicon nitride ferrovanadium alloys. The current silicon-vanadium ferroalloy production process is complicated, the raw material is expensive, and the production cost is high. [0003] Copper slag is a by-product of copper smelting. Every ton of copper produced produces about 2.2 tons of copper slag. The main compo...

AI Technical Summary

Problems solved by technology

Waste slag produced during the production of high vanadium iron, which contains high V 2 o 5 and Al 2 o 3 , directly discarding will cause waste of resources and environmental pollution