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

A technology for quenching and tempering treatment and slag melting, which is applied in the field of smelting reduction production and quenching and tempering treatment of niobium-containing mixed slag, can solve the problems of low production cost, high metal recovery rate, short reaction time, etc., and achieves efficient and comprehensive utilization of resources. Effect

Active Publication Date: 2016-11-16
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 re

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

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Embodiment 1

[0159] A method for smelting reduction production and quenching and tempering treatment of mixed slag containing rare earth and niobium, comprising the following steps:

[0160] Step 1, smelting reduction ironmaking:

[0161] (1) The rare earth-containing blast furnace slag obtained from the blast furnace slag outlet, and the converter molten niobium-containing steel slag obtained from the steel slag outlet are added to an insulation pit with a carbon-dolomite composite thermal insulation refractory material in the inner layer to form a Rare earth and niobium mixed slag, firstly add coal powder to the rare earth and niobium mixed slag, then add Baiyan Obo Iron Mine direct reduced iron, ordinary iron concentrate metallized pellets to form mixed slag, spray into the preheating temperature It is 800°C pulverized coal, heat the mixed slag to a molten state, and carry out smelting reduction to ensure the two parameters (a) and (b) in the reaction device: (a) the temperature of the ...

Embodiment 2

[0179] A method for smelting reduction production and quenching and tempering treatment of mixed slag containing rare earth and niobium, comprising the following steps:

[0180] Step 1, smelting reduction ironmaking:

[0181] (1) Add the rare earth-containing blast furnace slag obtained from the blast furnace slag outlet and the converter molten niobium-containing steel slag obtained from the steel slag outlet to a pourable thermal insulation slag tank with a graphite-silicon composite thermal insulation and demoulding refractory material in the inner layer , to form a mixed slag containing rare earth and niobium, first add coke powder to the mixed slag containing rare earth and niobium, and then add ordinary iron concentrate metallized pellets to form a mixed slag, which is sprayed into coal with a preheating temperature of 1200 °C powder, heat the mixed slag to a molten state, and carry out smelting reduction to ensure the two parameters (a) and (b) in the reaction device: (...

Embodiment 3

[0200] A method for smelting reduction production and quenching and tempering treatment of mixed slag containing rare earth and niobium, comprising the following steps:

[0201] Step 1, smelting reduction ironmaking:

[0202] (1) The rare earth-containing blast furnace slag obtained from the blast furnace slag outlet, the converter molten niobium-containing steel slag obtained from the steel slag outlet, and the pourable thermal insulation material with bituminous coal-spinel composite thermal insulation and demoulding refractory material in the inner layer are added. The slag tank is used to form a mixed slag containing rare earth and niobium. First, coke powder is added to the mixed slag containing rare earth and niobium, and then iron concentrate of Baiyan Obo Iron Mine is added to form a mixed slag. Coal powder, heat the mixed slag to a molten state, and carry out smelting reduction to ensure the two parameters (a) and (b) in the reaction device: (a) the temperature of the...

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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)...

Claims

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Application Information

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IPC IPC(8): C21B3/06C21B11/00C22B7/04C22B59/00C22B34/24
CPCC21B3/06C21B11/00C22B7/001C22B7/04C22B34/24C22B59/00Y02P10/20Y02W30/50
Inventor 张力张武
Owner NORTHEASTERN UNIV
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