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Method for decomposing titanium-containing blast-furnace slag through fused salt

A technology of blast furnace slag and blast furnace titanium slag, which is applied in the fields of hydrometallurgy and metal oxide preparation, can solve the problems of low titanium leaching rate, secondary pollution, and small processing capacity, so as to avoid secondary pollution and reduce production capacity The effect of reducing consumption and slag discharge

Inactive Publication Date: 2011-10-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of secondary pollution, high energy consumption, and small processing capacity in the existing titanium-containing blast furnace slag extraction technology, especially the main problem of low titanium leaching rate in the perovskite phase, and provide a Method for decomposing titanium-containing blast furnace slag by molten salt

Method used

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  • Method for decomposing titanium-containing blast-furnace slag through fused salt
  • Method for decomposing titanium-containing blast-furnace slag through fused salt
  • Method for decomposing titanium-containing blast-furnace slag through fused salt

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Experimental program
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Effect test

Embodiment 1

[0026] The titanium-containing blast furnace slag that is ball-milled to a particle size of less than 0.074mm is mixed with NaOH+NaF evenly, and reacted at 500°C for 4 hours, wherein the mass ratio of NaOH to titanium-containing blast furnace slag is 4:1, and the molar ratio of NaOH:NaF is 4 : 1, after the reaction, solid mesophase is obtained, and the XRD figure of solid mesophase is as attached figure 2 shown;

[0027] Wash the solid mesophase with water, the washing temperature is 60°C, the washing solid-liquid mass ratio is 1:20, and the XRD spectrum of the product after washing is shown in the attached image 3 As shown, all generate an amorphous phase; then the product after washing is suction filtered, and the solid phase obtained is a solid intermediate product containing Ti and impurities Fe, Ca and Mg, and the filtrate is a solid intermediate product containing NaOH, NaF and impurities Si, Al and Mn mixed lye;

[0028] Add CaO to the obtained mixed lye containing ...

Embodiment 2

[0032] The titanium-containing blast furnace slag that is ball-milled to a particle size of less than 0.074mm is uniformly mixed with NaOH+NaF, and reacted at 200°C for 10 hours, wherein the mass ratio of NaOH to titanium-containing blast furnace slag is 10:1, and the molar ratio of NaOH:NaF is 10 : 1, obtain solid mesophase after the reaction;

[0033] Wash the solid interphase with water, the washing temperature is 60°C, and the washing solid-to-liquid mass ratio is 1:20; then the washed product is subjected to suction filtration, and the obtained solid phase is a solid intermediate product containing Ti and impurities Fe, Ca and Mg , the filtrate is a mixed lye containing NaOH, NaF and impurities Si, Al and Mn;

[0034] Add CaO to the obtained mixed lye containing NaOH, NaF and impurities Si, Al and Mn according to the mass ratio of calcium to silicon: 1: (1-3), convert Si and Al into insoluble aluminosilicate, filter to remove, filter The final solution is evaporated and ...

Embodiment 3

[0038] The titanium-containing blast furnace slag that is ball-milled to a particle size of less than 0.074mm is uniformly mixed with NaOH+NaF, and reacted at 700°C for 1 hour, wherein the mass ratio of NaOH to titanium-containing blast furnace slag is 1:1, and the molar ratio of NaOH:NaF is 1 : 1, obtain solid mesophase after the reaction;

[0039] The intermediate phase is washed with water at a washing temperature of 70°C, and the washing solid-to-liquid mass ratio is 1:30; then the washed product is subjected to suction filtration, and the obtained solid phase is a solid intermediate product containing Ti and impurities Fe, Ca and Mg, The filtrate is a mixed lye containing NaOH, NaF and impurities Si, Al and Mn;

[0040] Add CaO to the obtained mixed lye containing NaOH, NaF and impurities Si, Al and Mn according to the mass ratio of calcium to silicon: 1: (1-3), convert Si and Al into insoluble aluminosilicate, filter to remove, filter The final solution is evaporated an...

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Abstract

The invention relates to the field of metallurgy and resource comprehensive utilization, in particular to a method for decomposing titanium-containing blast-furnace slag through fused salt, which has the advantages of environment friendliness, low pollution and high efficiency. The method comprises the following steps of: by taking the titanium-containing blast-furnace slag as the raw material; after ball-milling, reacting the titanium-containing blast-furnace slag with a NaOH and NaF fused salt system at 200-700 DEG C to generate a solid intermediate phase; after hydrolyzing, extraction-filtering, dissolving with acid and extraction-filtering the solid intermediate phase to obtain a metatitanic acid solution; hydrolyzing and extraction-filtering the metatitanic acid solution to obtain hydration titanium dioxide powder; and calcining the hydration titanium dioxide powder at 600-1300 DEG C to finally obtain rutile type carbon dioxide. By means of the method disclosed by the invention, alkali circulation and acid circulation in the system are realized; the production energy consumption is reduced; the production process is simplified; the equipment investment is reduced; the process operability is improved; and meanwhile, a lot of accumulated titanium-bearing blast-furnace slag is utilized; the environmental problem is solved; and the titanium resource is sufficiently utilized.

Description

technical field [0001] The invention relates to the fields of hydrometallurgy and metal oxide preparation, in particular to a green and efficient method for decomposing titanium-containing blast furnace slag by molten salt. Background technique [0002] my country has relatively large reserves of vanadium-titanium magnetite, which has been proven to be 6.19 billion tons. At present, my country has first solved the technical problem of producing pig iron by smelting high-titanium iron (vanadium) concentrates in blast furnaces, but most of the titanium-containing phases are stored in the slag phase in a very fine and dispersed state, becoming 15-containing ~25wt% titanium-containing blast furnace slag, and the massive accumulation of titanium-containing blast furnace slag has caused a large loss of titanium resources and environmental pollution. At present, in order to extract valuable elements from titanium-containing blast furnace slag, scientific and technological workers h...

Claims

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Application Information

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IPC IPC(8): C22B34/12C21B3/06
CPCY02W30/50
Inventor 薛向欣于洪浩
Owner NORTHEASTERN UNIV
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