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Method for recleaning vanadium-titanium magnetite concentrates by using oxidation and alkaline leaching, desliming and combined magneto-gravity separation

A technology of vanadium-titanium magnetite concentrate and oxidative alkali leaching, which is applied in chemical instruments and methods, magnetic separation, wet separation, etc., to achieve the effects of improving comprehensive utilization, increasing blast furnace utilization coefficient, and reducing ironmaking costs

Inactive Publication Date: 2016-02-03
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to overcome the deficiencies of the above-mentioned beneficiation methods, the technical problem to be solved by the present invention is to provide a low cost, high recovery quality and efficiency, simple process, and good operability using oxidation based on the effective combination of physical and chemical beneficiation methods. Alkali leaching, desliming and magnetic gravity combined re-selection of vanadium-titanium magnetite concentrate achieves high-efficiency separation of titanium and iron in vanadium-titanium magnetite concentrate, improves iron grade before entering the furnace, and reduces TiO entering the blast furnace 2 , S, Si, Al and other impurities, improve the blast furnace utilization factor, reduce the discharge of blast furnace slag, reduce the cost of ironmaking, and increase the TiO 2 Comprehensive utilization of resources to reduce environmental pollution

Method used

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  • Method for recleaning vanadium-titanium magnetite concentrates by using oxidation and alkaline leaching, desliming and combined magneto-gravity separation
  • Method for recleaning vanadium-titanium magnetite concentrates by using oxidation and alkaline leaching, desliming and combined magneto-gravity separation
  • Method for recleaning vanadium-titanium magnetite concentrates by using oxidation and alkaline leaching, desliming and combined magneto-gravity separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like figure 1 shown.

[0042] 1) Alkali leaching

[0043] The TFe content was 51.1%, TiO 2 The content is 14.5%, SiO 2 The content is 4.98%, Al 2 O 3 The vanadium-titanium magnetite concentrate with a content of 4.85% and a S content of 0.82% was placed in a NaOH alkaline solution with a mass concentration of 12%, and fed with 99psi of O 2 , then at a temperature of 330 ° C, the alkali leaching reaction was carried out for 1.5 hours, and the reactants were filtered to obtain a filtrate and an alkali leaching filter cake A. The NaOH consumption was 83.7kg / t for ore feeding, and the filtrate was fed into the recovery treatment system. The chemical reaction formula is:

[0044] 4mFeTiO 3 +8NaOH+mO 2 2mFe 2 O 3 ↓+4Na 2 O·(TiO 2 ) m ↓+4H 2 Om≥1

[0045] pFe 3 O 4 q (FeO TiO 2 )+2rNaOHpFe 3 O 4 ↓+qFeO↓+(Na 2 O) r ·(TiO 2 ) q ↓+rH 2 O

[0046] Al 2 O 3 +2NaOH2NaAlO 2 +H 2 O

[0047] tSiO 2 +2NaOHNa 2 O·(SiO 2 ) t ↓+H 2 O

[0048] 3FeS 2 +...

Embodiment 2

[0059] like figure 1 shown.

[0060] 1) Alkali leaching

[0061] The TFe content was 51.9%, TiO 2 The content is 14.0%, SiO 2 The content is 4.61%, Al 2 O 3 The vanadium-titanium magnetite concentrate with a content of 4.92% and a S content of 0.84% ​​was placed in a 7% NaOH alkaline solution, and fed with 21psi of O 2 , then at a temperature of 220 ° C, the alkali leaching reaction was carried out for 2.0 hours, and the reactants were filtered to obtain a filtrate and an alkali leaching filter cake A. The NaOH consumption was 53.8kg / t for ore feeding, and the filtrate was fed into the recovery treatment system. The chemical reaction formula is the same as in Example 1;

[0062] 2) Desliming

[0063] The alkaline leaching filter cake A in step 1) is mixed with water to prepare ore pulp with a mass concentration of 21% and fed into a desliming hopper of ∮ 5.0 meters for desliming operation, to obtain sand settling B and overflow C;

[0064] 3) Magnetic gravity combined...

Embodiment 3

[0069] like figure 1 shown.

[0070] 1) Alkali leaching

[0071] The TFe content was 52.5%, TiO 2 The content is 13.6%, SiO 2 The content is 4.76%, Al 2 O 3 The vanadium-titanium magnetite concentrate with a content of 4.75% and a S content of 0.83% was placed in a NaOH alkaline solution with a mass concentration of 28%, and 89kg / t was added. 给矿 H 2 O 2 , then at a temperature of 290 ° C, the alkali leaching reaction was carried out for 1.5 hours, and the reactant was filtered to obtain filtrate and alkali leaching filter cake A, and the NaOH consumption was 85.1kg / t for ore feeding. The chemical reaction formula is:

[0072] 2mFeTiO 3 +4NaOH+mH 2 O 2 mFe 2 O 3 ↓+2Na 2 O·(TiO 2 ) m ↓+(m+2)H 2 Om≥1

[0073] pFe 3 O 4 q (FeO TiO 2 )+2rNaOHpFe 3 O 4 ↓+qFeO↓+(Na 2 O) r ·(TiO 2 ) q ↓+rH 2 O

[0074] Al 2 O 3 +2NaOH2NaAlO 2 +H 2 O

[0075] tSiO 2 +2NaOHNa 2 O·(SiO 2 ) t ↓+H 2 O

[0076] 3FeS 2 +6NaOH3FeS↓+Na 2 SO 3 +2Na 2 S+3H 2 O

[00...

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Abstract

The invention relates to a method for recleaning vanadium-titanium magnetite concentrates by using oxidation and alkaline leaching, desliming and combined magneto-gravity separation. The method comprises the following steps: vanadium-titanium magnetite concentrates are put into an alkaline solution and an oxidizing agent is added; then an alkaline leaching reaction lasts for 0.5-2 hours at the temperature of 220 DEG C-330 DEG C; reactants are filtered, so that a filtrate and an alkaline leaching filter cake A are obtained; and the filter cake A is added with water, and the mixture is prepared into ore pulp for desliming and combined magneto-gravity recleaning. The method has the advantages as follows: due to the introduction of O2 or H2O2 during oxidation and alkaline leaching, compounds containing S are oxidized, the reaction is accelerated, and the reaction temperature and the energy consumption are reduced. Besides, an iron ore concentrate with the TFe content of 65 %-70 % and a titanium concentrate with the TiO2 content of 50 %-70 % are screened, so that efficient separation of titanium and iron in vanadium-titanium magnetite concentrates is achieved, the content of impurities entering a blast furnace, such as TiO2, S, Si, Al and the like is reduced, the utilization coefficient of blast furnace is increased, and the comprehensive utilization ratio of titanium resources is increased as well.

Description

technical field [0001] The invention relates to a beneficiation process for vanadium-titanium-magnetite concentrates, in particular to a method for re-selecting vanadium-titanium-magnetite concentrates by oxidizing alkali leaching, desliming and magnetic gravity combined. Background technique [0002] Vanadium titanomagnetite is a composite ore of polymetallic elements, which is a symbiotic magnetite mainly containing iron, vanadium and titanium. The vanadium-titanium-magnetite concentrate is one of the products obtained by the beneficiation of vanadium-titanium-magnetite, in which vanadium exists in the titanomagnetite in a homogeneous form, replacing high-valent iron ions. Titanium magnetite is the host mineral (Fe 3 O 4 ) and guest crystal ore [Ilmenite 2FeO·TiO 2 , ilmenite FeO TiO 2 , aluminum magnesium spinel (Mg, Fe) (Al, Fe) 2 O 4 ] The complex formed. For example, the chemical multi-element analysis results of vanadium titanomagnetite raw ore and vanadium tit...

Claims

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Application Information

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IPC IPC(8): C22B3/12B03B7/00B03C1/30
Inventor 李之奇刘政东孟劲松文孝廉陈巍郭客刘晓明宋仁峰
Owner ANSTEEL GRP MINING CO LTD
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