Method for metallurgic smelting reduction recovery of rare earth-contained mixed slag

Abstract

The invention relates to a method for metallurgic smelting reduction recovery of rare earth-contained mixed slag, and belongs to the field of non-blast furnace iron refining and resource comprehensive utilization. The method comprises the following steps: molten-state rare earth-contained blast furnace slag and molten-state steel slag are mixed to form reaction mixed slag; the temperature of the reaction mixed slag is controlled in a set temperature range; the full mixing is realized; the mass concentration of FeO is not more than 1.0%; and the reaction mixed slag is separated and recovered according to differences of reaction devices. The rare earth and calcium components, the niobium component, the phosphorus component and the like in the mixed slag are efficiently recovered; cold-state materials containing niobium, rare earth and iron can be treated to achieve high-efficiency resource comprehensive utilization; the method is short in reaction time, high in metal recovery rate, low in production cost, high in raw material adaptability, high in treatment quantity, environment-friendly and high in economic benefit, and can effectively solve the high-efficiency recycling problems of metallurgic resources and heat energy.

Description

[0001] Technical field: [0002] The invention belongs to the field of non-blast furnace ironmaking and resource comprehensive utilization, and specifically relates to a method for metallurgical smelting reduction recovery of rare earth-containing mixed slag. [0003] Background technique: [0004] The Baiyan Obo Mine is a rare large-scale polymetallic symbiotic mine with iron, rare earth, niobium, thorium and other elements in the world. At present, the iron reserves are 1.46 billion tons, and the rare earth resources are R 2 o 3 , 135 million tons, ranking first in the world, niobium resources, Nb 2 o 5 Accounting for 95% of our country. my country adopts the process of "Baiyan Obo Iron Ore Dressing-Blast Furnace-Converter" to realize the large-scale utilization of Baiyan Obo Iron Ore. [0005] Rare earth-containing blast furnace slag is produced in the blast furnace ironmaking process of Baiyan Obo Iron Mine. its RE 2 o 3 Content 0.1-8%, about 0.01-0.08% ThO 2 , my c...

AI Technical Summary

Problems solved by technology

The method has short reaction time, high metal recovery rate, low production cost, strong raw material adaptability, large processing capacity, environmental friendliness, high economic returns, and can effectively solve the problems of environmental pollution, metallurgical resources and efficient recovery and utilization of heat energy. The new process of slag metallurgy, a new smelting reduction process, is the perfection and innovation of the existing metallurgical process. It is the first time in the world to develop a slag metallurgical process. The slag is not a waste, but a metallurgical intermediate product