Method for smelting reduction production and quenching and tempering treatment of rare earth and niobium containing mixed slag

Abstract

The invention discloses a method for smelting reduction production and quenching and tempering treatment of rare earth and niobium containing mixed slag. The method comprises the steps that (1) a reducing agent, a niobium and rare earth containing material and / or an iron containing material are added into the rare earth and niobium containing mixed slag to form mixed slag, the mixed slag is heated to be in a smelted state, smelting reduction is carried out, oxidizing gas is blown, and the temperature range of the mixed slag and the specific value and temperature of alkaline CaO / SiO2 are controlled in the process; and (2) separating and recycling are carried out according to different reaction devices, components of rare earth, iron, niobium and phosphorus in the mixed slag, free calcium oxide and the like are efficiently recycled, solid rare earth, niobium and iron materials are treated in a large scale through the smelting reduction process, meanwhile, quenching and tempering of the slag are achieved, resources are efficiently and comprehensively utilized, and the method is a new smelting reduction ironmaking process. The method is short in reaction time, high in metal recycling rate, low in production cost, high in raw material adaptability, environment-friendly and high in economic benefit, and the aim of efficient recycling of multi-metal grandidierite metallurgy resources and heat energy can be effectively achieved.

Description

Technical field: [0001] The invention belongs to the technical field of non-blast furnace ironmaking and resource comprehensive utilization, and specifically relates to a method for smelting reduction production and quenching and tempering treatment of niobium-containing mixed slag. Background technique: [0002] 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. Baiyan Obo Mine has the following characteristics: (1) "Many": many available elements, fluorine, potassium, sodium, phosphorus, as many as 26 kinds of available elements; (2) "poor", low element content, full iron grade, 30%, iron silicate, etc.; rare earth (RE 2 o 3 ) content above 6%; Niobium, Nb 2 o 5 , 0.1%; (3)...

AI Technical Summary

Problems solved by technology

The method is a method for producing niobium-containing pig iron or niobium-containing steel, rare earth-rich slag, niobium-rich slag, phosphorus-rich phase and slag conditioning treatment by smelting and reducing mixed slag containing rare earth. The invention has short reaction time and high metal recovery. High efficiency, low production cost, strong raw material adaptability, large processing capacity, environmental friendliness, high economic returns, can effectively solve the problem of efficient recovery and utilization of metallurgical resources and heat energy in multi-metal composite mines

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