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Method for preparing high-purity titanium dioxide from titanium-containing blast furnace slag

A technology for titanium dioxide and blast furnace slag, which is applied in the fields of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of high impurity content, low titanium concentration and long process, so as to improve the acid hydrolysis conversion rate and reduce the The amount of sulfuric acid and the effect of promoting hydrolysis

Active Publication Date: 2020-12-08
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the industrial titanyl sulfate solution, the heterogeneous titanyl sulfate solution obtained by this method has a low titanium concentration (Ti concentration (in terms of TiO 2 Total) 4 ):>20g / L, c(Al 2 (SO 4 ) 3 ):>20g / L), limited by normal pressure hydrolysis conditions, the titanium liquid needs to be purified and concentrated before the normal pressure self-generation / additional seed crystal hydrolysis operation, there are problems such as long process, large energy consumption, low yield, etc. make its practical application limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Crush and grind titanium-containing blast furnace slag, and sieve through 200 mesh to remove the coarse slag on the sieve; mix the sieved titanium-containing blast furnace slag, sodium dodecylsulfonate, ammonium sulfate and 95% sulfuric acid solution, and the mass ratio of each substance Titanium-containing blast furnace slag: sodium dodecylsulfonate: ammonium sulfate: 95% sulfuric acid solution = 100:0.01:0.1:170, reacted at 80°C, normal pressure, and uniform mixing conditions for 2 hours to obtain the acid hydrolysis product; Mix the acid hydrolysis product with water at a mass ratio of 1:1.5, react at 75°C for 2 hours under uniform stirring conditions, and then filter to obtain a solution containing titanyl sulfate; mix the solution containing titanyl sulfate, sodium sulfate and dodecyl Potassium aluminum sulfate hydrate is mixed according to the mass ratio of 100:0.1:0.01, the mixed solution is placed in a hydrothermal kettle and sealed, and the hydrothermal reaction...

Embodiment 2

[0038] Crush and grind titanium-containing blast furnace slag, and sieve through 400 meshes to remove the coarse slag on the sieve; mix the sieved titanium-containing blast furnace slag, sodium dodecylbenzenesulfonate, ammonium chloride and 85% sulfuric acid, and the mass of each substance The ratio is titanium-containing blast furnace slag: sodium dodecylsulfonate: ammonium chloride: 85% sulfuric acid = 100: 0.05: 0.5: 200, reacted for 3 hours at 120 ° C, normal pressure, and uniform mixing conditions to obtain the acid hydrolysis product Mix the acid hydrolysis product with water at a mass ratio of 1:2.5, react at 60°C for 3 hours under uniform stirring, and then filter to obtain a solution containing titanyl sulfate; mix titanyl sulfate solution, potassium sulfate and aluminum Sodium acid is mixed according to the mass ratio of 100:0.5:0.1, the mixed solution is placed in a hydrothermal kettle and sealed, and the hydrothermal reaction is carried out at 150°C, the pressure is...

Embodiment 3

[0040] Crush and grind titanium-containing blast furnace slag, and sieve through 350 mesh to remove the coarse slag on the sieve; after screening, titanium-containing blast furnace slag, sodium cetyl sulfonate, sodium cetylbenzene sulfonate, ethylenediaminetetra Acetic acid and 90% sulfuric acid are mixed, and each substance mass ratio is titanium-containing blast furnace slag: sodium cetyl sulfonate: sodium cetylbenzene sulfonate: 90% sulfuric acid=100: 0.1: 1: 180, at 100 ℃, React for 0.5 hours under normal pressure and uniform mixing conditions to obtain the acid hydrolysis product; mix the acid hydrolysis product and water at a mass ratio of 1:2.5, react at 75°C for 2 hours under uniform stirring conditions, and then filter to obtain the sulfuric acid containing oxygen Titanium solution: Mix the heterotitanyl sulfate solution, sodium sulfate, ammonium sulfate, and polyaluminium chloride at a mass ratio of 100:0.2:0.4:0.06, place the mixed solution in a hydrothermal kettle a...

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Abstract

The invention discloses a method for preparing high-purity titanium dioxide from titanium-containing blast furnace slag, and belongs to the technical field of chemical material preparation. The methodcomprises the following steps: by taking the titanium-containing blast furnace slag as a raw material, firstly, preparing an impurity-containing titanyl sulfate solution by a sulfuric acid enhanced acidolysis method; separating impurities and titanium-containing components by using a selective hydrothermal deposition method to prepare a metatitanic acid precursor; and calcining the metatitanic acid precursor, controlling the calcination temperature to regulate the crystal form of the product to obtain anatase or rutile high-purity titanium dioxide with the purity of more than or equal to 98%,The total yield of the titanium dioxide is more than or equal to 85%. The method is mainly characterized in that efficient conversion and comprehensive impurity removal of the low-grade titanium-containing blast furnace slag are realized by utilizing an enhanced acidolysis and selective hydrothermal precipitation method, the method has the outstanding characteristics of short process flow, high product purity, high titanium yield, low acid consumption and the like, and a new way is provided for industrial application of the titanium-containing blast furnace slag.

Description

technical field [0001] The invention belongs to the technical field of chemical material preparation, and in particular relates to a method for preparing high-purity titanium dioxide by using titanium-containing blast furnace slag as a raw material. Background technique [0002] Titanium-containing blast furnace slag is a by-product produced in the blast furnace smelting process of vanadium-titanium magnetite, and the mass fraction of each component in the slag is TiO 2 : 21~25%; SiO 2 : 22~26%; CaO: 22~29%; Al 2 o 3 Fe: 16-19%; MgO: 7-9%; total Fe: 0.2-0.4%. At present, the comprehensive utilization rate of titanium-containing blast furnace slag resources is low, and it is mainly used to prepare low-end building materials such as slag cement, sanitary porcelain plates and alkali-resistant mineral wool (Liu Shuai, research status and development prospects of titanium extraction technology from high-titanium blast furnace slag, China Metallurgy, 2020, 30(3), 1~7), but the...

Claims

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Application Information

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IPC IPC(8): C01G23/053
CPCC01G23/0532C01P2006/80
Inventor 向兰王明亮杨卓颖杨帆
Owner TSINGHUA UNIV
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