A method of producing magnesium titanate and direct-reduced iron by coal-based reduction and magnetic separation of titanomagnetite

A technology of titanium magnetite and magnesium titanate, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problems of low yield, complex reaction process, harsh conditions, etc., and achieve the effect of comprehensive utilization

Inactive Publication Date: 2015-09-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the generated product has high purity, the reaction process is complicated, the conditions are harsh, and the yield is low.

Method used

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  • A method of producing magnesium titanate and direct-reduced iron by coal-based reduction and magnetic separation of titanomagnetite
  • A method of producing magnesium titanate and direct-reduced iron by coal-based reduction and magnetic separation of titanomagnetite
  • A method of producing magnesium titanate and direct-reduced iron by coal-based reduction and magnetic separation of titanomagnetite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] See Table 1 for the multi-element analysis of the magnetically separated concentrate (hereinafter referred to as the sample) obtained from a seaside titanomagnetite separated by a drum magnetic separator. Among them, the iron-containing minerals are mainly titano-magnetite, basically no gangue minerals, the contents of S and P are low, and V is not included. The particle size of the reducing agent coal used in the sample is -2mm, and the coal quality analysis is shown in Table 2

[0030] Table 1 Sample (seaside titanium magnetite magnetic separation concentrate) multi-element analysis

[0031]

[0032] Table 2 Analysis results of bituminous coal quality

[0033]

[0034] The distribution ratio of the main components is: 20g of the sample (magnetic separation concentrate) (-74μm accounts for 86.5%); the amount of the main raw material MgO is 25% of the sample mass; the amount of the binder CMC is 0.2% of the sample mass; In addition, an additive with a mass fract...

Embodiment 2

[0037] Table 3 shows the multi-element analysis of samples obtained from a titanium magnetite in Indonesia after wet weak magnetic separation. Among them, the iron-bearing minerals are mainly titanium magnetite, and the gangue minerals are very small, containing a small amount of V. The reducing agent for the reduction and roasting of the sample is anthracite with a particle size of -2mm, and the coal quality analysis is shown in Table 4

[0038] Table 3 Sample (a titanium magnetite concentrate in Indonesia) multi-element analysis

[0039]

[0040] Table 4 Analysis results of anthracite coal quality

[0041]

[0042]

[0043] In the direct reduction process, the sample size is 20g (-74μm accounts for 85.0%); the other main raw material is magnesite with MgO grade of 44.56%, and the dosage is 26% of the sample mass; the binder is CMC, and the dosage It is 0.25% of the mass of the sample; in addition, an additive with a mass fraction of 2.4% of the sample is added, th...

Embodiment 3

[0046] The iron-bearing minerals in a titanomagnetite in Yunnan are mainly titanomagnetite, with a small amount of ilmenite and biotite. The raw ore was subjected to wet weak magnetic separation after crushing and grinding, and the multi-element analysis of the obtained magnetic separation concentrate (hereinafter referred to as the sample) is shown in Table 5. The reducing agent used in the sample is bituminous coal, the particle size is -2mm, and the coal quality analysis is shown in Table 6

[0047] Table 5 Sample (seashore titanium magnetite magnetic separation concentrate) multi-element analysis

[0048]

[0049] Table 6 Analysis results of bituminous coal quality

[0050]

[0051] The distribution ratio of the main components is: 20g of the sample (magnetic separation concentrate) (-74μm accounts for 85.7%); the amount of the main raw material MgO is 22% of the sample mass; the amount of the binder CMC is 0.25% of the sample mass; In addition, an additive with a ...

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Abstract

The invention relates to a method of producing magnesium titanate and direct-reduced iron by coal-based reduction and magnetic separation of titanomagnetite, and belongs to the field of resource utilization. Magnesium titanate powder adopting magnesium orthotitanate as the main crystalline phase and direct-reduced iron powder are obtained by subjecting the titanomagnetite to low-intensity magnetic separation for removing impurities, direct reduction calcination and multistage grinding and magnetic separation, thus achieving comprehensive utilization of valuable metals in the titanomagnetite. The method adopts the titanomagnetite and magnesite which are low in cost as main raw materials and is simple. Raw materials are wide in source, low in using amounts and low in cost. Coal is adopted as a reducing agent. The method is free of requirements on coal quality. The calcination temperature is 1250-1350 DGE C, which is 100-200 DEG C lower than that of solid phase reaction methods at present. Preparation of the magnesium titanate and production of the direct-reduced iron powder are completed synchronously. The magnesium orthotitanate crystalline phase and grade and the recovery rate of the direct-reduced iron are ensured, harmful elements are inhibited from entering products, and the calcination temperature is reduced. The direct-reduced iron powder the iron grade of which is higher than 90% and the recovery rate of which is higher than 95%, and the magnesium orthotitanate powder having purity higher than 99%, and are finally prepared.

Description

technical field [0001] The invention belongs to the field of resource utilization, and relates to a microwave dielectric ceramic raw material produced by direct reduction roasting-magnetic separation by using titanium magnetite and magnesium-containing compounds as raw materials, adding a small amount of additives and binder pressure balls, and using coal as a reducing agent. A process for magnesium titanate and direct reduced iron. technical background [0002] At present, there are many technical methods for comprehensive utilization of titanium magnetite. Some researchers have proposed a process for separating titanium and magnesium from seashore titanomagnetite through coal-based direct reduction roasting (patent number: CN 103290205 A). The method uses titano-magnetite as raw material and coal as reducing agent, by adding binder (such as: bentonite, etc.), additives (such as: sodium carbonate and sodium borate, etc.) The pellets were reduced and roasted in a muffle fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C21B13/00C01G23/00
Inventor 寇珏孙体昌马友文耿超
Owner UNIV OF SCI & TECH BEIJING
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