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

A quenching and tempering treatment and slag technology, 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, short reaction time, high metal recovery rate, etc., and achieve the goal of efficient and comprehensive utilization of resources Effect

Active Publication Date: 2018-05-04
NORTHEASTERN UNIV LIAONING
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  • Summary
  • 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 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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  • A method for smelting reduction production and quenching and tempering treatment of mixed slag containing rare earth and niobium

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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 from 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 t...

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Abstract

A method for smelting reduction production and quenching and tempering of mixed slag containing rare earth and niobium: 1) adding reducing agent, niobium-containing rare earth material and / or iron-containing material to mixed slag containing rare earth and niobium to form mixed slag, The mixed slag is heated to a molten state, smelted and reduced, and oxidizing gas is blown. During the process, the temperature range of the mixed slag and the range and temperature of the alkalinity CaO / SiO2 ratio are controlled; 2) Separation and recovery are carried out according to different reaction devices to achieve mixed melting Efficient recovery of rare earth, iron, niobium, phosphorus components and free calcium oxide in the slag, using the smelting reduction process to process solid rare earth, niobium, and iron-containing materials on a large scale, while achieving quenching and tempering of the slag, and efficient and comprehensive utilization of resources. A new smelting reduction ironmaking process; the invention has short reaction time, high metal recovery rate, low production cost, strong raw material adaptability, environmental friendliness, high economic returns, and can effectively solve the problem of efficient recovery and utilization of metallurgical resources and thermal energy of polymetallic composite ores .

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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Patent Type & Authority Patents(China)
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 LIAONING