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A process of separating iron and titanium in seaside titanomagnetite via direct reduction roasting by using coal

A seashore titanomagnetite, direct technology, applied in the field of iron and titanium, can solve the problem of difficult separation of titanium and iron, and achieve the effects of easy treatment, less pollutant discharge, and simple types

Active Publication Date: 2013-09-11
UNIV OF SCI & TECH BEIJING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of difficult separation of titanium and iron existing in the utilization of seaside titano-magnetite at present, and changes the method of directly processing raw ore in the traditional beneficiation process. Exist in roasted ore, and then recover iron and titanium from the roasted ore by beneficiation method

Method used

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  • A process of separating iron and titanium in seaside titanomagnetite via direct reduction roasting by using coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A seashore titanium magnetite contains 51.35% iron and 11.13% titanium dioxide. Add 8% bentonite as a binder, add 30% coal as a reducing agent, and 8% additives. After mixing evenly, press them into balls on a briquetting machine. Selective reduction roasting conditions are as follows: the ore balls are reduced and roasted in a muffle furnace at 1250°C for 40 minutes; cooled at room temperature; ground at a concentration of 60% until the particle size is -0.074mm accounting for 90%, and magnetically separated at a magnetic field strength of 120kA / m. A direct reduced iron with an iron grade of 93.21% and an iron recovery rate of 88.73% was obtained, in which the content of titanium dioxide was 0.43%. The content of titanium dioxide in the magnetic separation tailings is 23.03%, and the recovery rate of titanium is 98.04%.

Embodiment 2

[0015] A seashore titanium magnetite contains 48.25% iron and 7.45% titanium dioxide. Add 10% bentonite as a binder, add 25% coal as a reducing agent, and add 9% additives, mix well and press into balls on a briquetting machine. Selective reduction roasting conditions are as follows: the ore balls are reduced and roasted in a muffle furnace at 1200 ° C for 50 minutes; cooled at room temperature; ground at a mass concentration of 62% until the particle size is -0.074mm, accounting for 95%, and the magnetic field strength is 110kA / m under the condition of weak magnetic separation. A direct reduced iron with an iron grade of 93.12% and an iron recovery rate of 85.12% was obtained, in which the content of titanium dioxide was 0.45%. The content of titanium dioxide in the magnetic separation tailings is 22.71%, and the recovery rate of titanium is 97.35%.

Embodiment 3

[0017] A seashore titanium magnetite contains 50.14% iron and 10.33% titanium dioxide. Add 11% bentonite as a binder, add 20% coal as a reducing agent, and 12% additives. After mixing evenly, press them into balls on a briquetting machine. Selective reduction roasting conditions are as follows: the ore balls are reduced and roasted in a muffle furnace at 1250°C for 80 minutes; cooled at room temperature; the ore is ground to a particle size of -0.074mm at a mass concentration of 65% of the pulp, accounting for 98%, and the magnetic field strength is 90kA / m magnetic separation. A direct reduced iron with an iron grade of 93.21% and an iron recovery rate of 88.73% was obtained, in which the content of titanium dioxide was 0.43%. The content of titanium dioxide in the magnetic separation tailings is 23.03%, and the recovery rate of titanium is 98.04%.

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Abstract

The invention provides a process of separating iron and titanium in seaside titanomagnetite via direct reduction roasting by using coal. According to the process, seaside titanomagnetite is employed as a raw material, a reducing agent, a binder, and an additive are added for briquetting, and then a selective direct reduction roasting - magnetic separation method is employed for respectively recovering iron and titanium. The process of the invention is simpler compared with other methods, wherein cost-effective coal is directly used as the reducing agent, additives added in the process is a mixture of sodium carbonate and sodium borate, and by adding the reducing agent and the additive, and controlling roasting temperature and time, selective reduction of iron and separation of iron and titanium can be achieved, ensuring the grade and recovery rate of direct reduced iron while reducing the titanium content in the direct reduced iron. The finally obtained direct reduction iron powder has a grade above 93%, the recovery rate of iron is generally greater than 85%, the titanium dioxide content is less than 0.5%, while the titanium dioxide content in obtained high titanium magnetic separation tailings is higher than 20%, and the recovery rate of titanium is greater than 90%.

Description

technical field [0001] The invention belongs to the field of resource utilization, and relates to a process method for separating iron and titanium in seaside titanomagnetite by direct reduction roasting-magnetic separation. This process uses seaside titanium-containing iron placer whose main useful mineral is titanomagnetite (hereinafter referred to as seashore titanomagnetite) as raw material, uses coal as reducing agent, and performs selective reduction roasting on seashore titanomagnetite by adding additives— Magnetic separation makes the iron enter the direct reduction iron powder in the form of metallic iron, while the titanium still enters the magnetic separation tailings in the form of oxide to be enriched, so as to realize the separation of iron and titanium. technical background [0002] my country's iron ore resource reserves are seriously insufficient. Among the 57.671 billion tons of iron ore reserves that have been identified, the economic base reserves are onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/243
Inventor 孙体昌张建华寇珏高恩霞孙昊
Owner UNIV OF SCI & TECH BEIJING
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