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Niobium concentrate powder reduction method

A technology for niobium concentrate and ore powder, which is applied in the field of reduction of niobium concentrate ore powder, can solve the problems of increasing energy consumption, reducing the grade of niobium iron ore concentrate, complicated operation, etc., and achieving low cost, short time and good working environment. Effect

Inactive Publication Date: 2018-08-17
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operation of the process is complicated, and the briquetting process requires heating, which increases additional energy consumption, and the process requires the mixing of reducing agent coal powder and ferroniobium concentrate powder, which will reduce the grade of niobium in the ferroniobium concentrate

Method used

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  • Niobium concentrate powder reduction method

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Experimental program
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Effect test

Embodiment 1

[0018] Such as figure 1 As shown, the reduction method of niobium concentrate ore powder according to the embodiment of the present invention includes: step S102, drying the niobium concentrate ore powder and reducing agent, the drying temperature is 100-200° C., and the drying time is 8-12 hours; Step S1044, laying a reducing agent with a preset thickness on the bottom of the crucible, and then dividing the space in the crucible into three parts: inner ring, middle ring and outer ring, filling the inner ring and outer ring with reducing agent, and filling the middle ring with niobium concentrate Mineral powder, wherein, the material layer thickness of the niobium concentrate ore powder is 20% to 25% of the inner diameter of the crucible; step S106, the reducing agent fills the space of the remaining inner ring, the middle ring and the outer ring to the level of the opening surface of the crucible Qi, cover the crucible lid; Step S108, put the crucible in the microwave oven, s...

Embodiment 2

[0021] 1) raw materials used in this embodiment

[0022] Niobium concentrate: Niobium concentrate ore powder after separation and enrichment of Baiyun Obo tailings, main chemical composition (wt%): Nb 2 o 5 5.1, FeO1.2, TFe42.2, TiO 2 8.24 SiO 2 21.87, CaO1.34, F0.85.

[0023] Coke powder: fixed carbon content 69.39wt%, ash content 17.22wt%, volatile matter 12.6wt%, particle size 0-2mm.

[0024] 2) Raw material processing

[0025] The niobium concentrate ore powder and coke powder are dried in a drying oven at a drying temperature of 120°C and a drying time of 10 hours.

[0026] 3) Loading

[0027] The crucible used in this embodiment is a crystalline silicon carbide crucible with an outer diameter of 60 mm, an inner diameter of 48 mm, and a height of 70 mm. When charging, the thickness of the niobium concentrate layer is controlled to be 10-12mm, and the corresponding charging mass is 58-67g.

[0028] Spread coke powder with a thickness of 5mm on the bottom of the cry...

Embodiment 3

[0032] 1) raw materials used in this embodiment

[0033] Niobium concentrate: Niobium concentrate ore powder after separation and enrichment of Baiyun Obo tailings, main chemical composition (wt%): Nb 2 o 5 5.1, FeO1.2, TFe42.2, TiO 2 8.24 SiO 2 21.87, CaO1.34, F0.85.

[0034] Coke powder: fixed carbon content 69.39wt%, ash content 17.22wt%, volatile matter 12.6wt%, particle size 0-2mm.

[0035] 2) Raw material processing

[0036] The niobium concentrate ore powder and coke powder are dried in a drying oven at a drying temperature of 120°C and a drying time of 10 hours.

[0037] 3) Loading

[0038] The crucible used in this embodiment is a crystalline silicon carbide crucible with an outer diameter of 60 mm, an inner diameter of 48 mm, and a height of 70 mm. When charging, the thickness of the niobium concentrate layer is controlled to be 10-12mm, and the corresponding charging mass is 58-67g.

[0039] Spread coke powder with a thickness of 5mm on the bottom of the cry...

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Abstract

The invention provides a niobium concentrate powder reduction method. The niobium concentrate powder reduction method comprises the steps of drying niobium concentrate powder and a reducing agent; levelly laying the reducing agent with the preset thickness at the bottom of a crucible, dividing the internal space of the crucible into an inner ring, a middle ring and an outer ring, filling the reducing agent in the inner ring and the outer ring and filling the niobium concentrate powder in the middle ring; filling the reducing agent into the remaining space of the inner ring, the remaining spaceof the middle ring and the remaining space of the outer ring until the reducing agent is flush with the opening surface of the crucible and covering a crucible cover; putting the crucible in a microwave oven and starting the microwave oven to conduct heating to obtain reduced niobium concentrate. Through the niobium concentrate powder reduction method, the microwave heating mode is adopted to replace a traditional heating mode; through the good microwave absorbing characteristics of the niobium concentrate and carbon, the niobium concentrate and carbonaceous reducing agents such as semicoke,pulverized coal or coke powder are heated under a microwave field to provide heat required for a selective reduction reaction to rapidly complete selective reduction of iron in the niobium concentratein an airtight reaction tank with the good thermal insulation property. The niobium concentrate powder reduction method has the advantages that energy consumption is low, the cost is low, the time isshort, and the working environment is good.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for reducing niobium concentrate ore powder. Background technique [0002] At present, the process of smelting ferro-niobium alloy is mainly divided into three steps, namely "selective reduction of niobium concentrate - smelting of niobium-rich slag - smelting of ferroniobium alloy". The method of selective reduction of niobium concentrate ore powder in this process is usually the following two : [0003] Method 1: before smelting niobium-rich slag, pre-reduce metallic iron in niobium concentrate at a lower temperature to reduce reaction energy consumption. However, due to the traditional heating method of heating from the outside to the inside, the reaction energy consumption is still high, the working conditions are poor, and there are still relatively serious pollution problems. [0004] Method 2: Mix ferroniobium concentrate powder, coal powder and binder to hea...

Claims

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Application Information

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IPC IPC(8): C22B34/24C22B5/10
CPCC22B34/24C22B5/10
Inventor 贾中帅周鑫张斌王继平韩淑霞王志诚王志鹏梁文京
Owner BAOTOU IRON & STEEL GRP