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Method for preparing rutile titanium dioxide by titanium slag

A titanium dioxide and rutile-type technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of long preparation process, weakened acidolysis performance, and large discharge of "three wastes", achieving obvious environmental benefits, less three wastes, The effect of short process

Active Publication Date: 2015-08-19
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

If the sulfuric acid process is used, due to the high content of aluminum, magnesium and silicon in the raw materials, the acidolysis performance will be weakened, and as the acidolysis progresses, a large amount of aluminum and magnesium will enter the acidolysis titanium solution, and after concentration, it will be easy to dissolve with the decrease of temperature. The water in the titanium liquid combines to form crystals (MgSO 4 ·7H 2 O and Al 2 (SO 4 ) 3 18H 2 O) resulting in the coagulation of concentrated titanium liquid into a colloid, which affects the continuous production. It is necessary to increase the dealumination process to achieve the purpose of normal production of titanium dioxide. In this way, the preparation process becomes longer than the traditional sulfuric acid titanium dioxide process. " The emission of "three wastes" is greater, and this method is not an ideal process for preparing titanium dioxide

Method used

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  • Method for preparing rutile titanium dioxide by titanium slag
  • Method for preparing rutile titanium dioxide by titanium slag

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The titanium slag is ground to ≤48 μm, and a 20% HCl solution with a mass concentration of 20% is added thereto, with a liquid-solid ratio of 10:1. After mixing evenly, put it into an autoclave and react at 150° C. for 10 hours to obtain a hydrothermal reaction product, and the leaching rate of titanium slag is 95%. The above reactant was filtered to obtain a mixture of titanium dioxide and silicon dioxide, and the reactant was washed with water and then leached with a NaOH solution with a concentration of 5 mol / L at a leaching temperature of 95° C. for 2 hours. After the leaching is completed, the solid and liquid are separated, the solid phase is washed with water to neutrality, and then dried at 100°C and dehydrated to obtain a rutile titanium dioxide product. Sodium silicate solution after solid-liquid separation with CO 2 Adjust the pH to prepare the by-product of white carbon black, and the obtained white carbon black is calcined at 550°C and its SiO 2 The conte...

Embodiment 2

[0028]Grind the titanium slag to ≤75 μm, add 25% HCl solution therein, and the liquid-solid ratio is 15:1. After mixing evenly, put it into an autoclave to react at 130° C. for 15 hours to obtain a hydrothermal reaction product, and the leaching rate of titanium slag is 95%. The above reactant was filtered to obtain a mixture of titanium dioxide and silicon dioxide, and the reactant was washed with water and then leached with a NaOH solution with a concentration of 5 mol / L at a leaching temperature of 95° C. for 2 hours. After the leaching is completed, the solid and liquid are separated, the solid phase is washed with water to neutrality, and then dried at 100°C and dehydrated to obtain a rutile titanium dioxide product. The sodium silicate solution after solid-liquid separation is adjusted with HCl solution to prepare the by-product of white carbon black, and the obtained white carbon black is calcined at 550°C and its SiO 2 The content is greater than 99%.

Embodiment 3

[0030] Grind the titanium slag to ≤45 μm, add 25% HCl solution therein, and the liquid-solid ratio is 8:1. After mixing evenly, put it into an autoclave and react at 180° C. for 6 hours to obtain a hydrothermal reaction product, and the leaching rate of titanium slag is 95%. The above reactant was filtered to obtain a mixture of titanium dioxide and silicon dioxide. The reactant was washed with water and then leached with a NaOH solution with a concentration of 7.5 mol / L. The leaching temperature was 90° C. for 2 hours. After the leaching is completed, the solid and liquid are separated, the solid phase is washed with water to neutrality, and then dried at 100°C and dehydrated to obtain a rutile titanium dioxide product. The sodium silicate solution after solid-liquid separation is adjusted with HCl solution to prepare the by-product of white carbon black, and the obtained white carbon black is calcined at 550°C and its SiO 2 The content is greater than 99%.

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Abstract

The invention discloses a method for preparing rutile titanium dioxide by titanium slag, which takes ironmaking byproduct-vanadium-titanium-iron concentrate for directly reducing to obtain a melting part titanium slag as a raw material, takes a hydrochloric acid solution as a solvent, and uses a hydrothermal method to prepare the titanium dioxide / silica intermediate products. The method comprises the following steps: using hydrochloric acid for leaching titanium from the titanium slag with high efficiency, then performing hydro-thermal synthesis on dissolved titanium to obtain titanium dioxide, finally using alkali lye to remove silicon from titanium dioxide to obtain rutile titanium dioxide with high purity, wherein a desilication solution can be used for preparing the byproduct white carbon black. The method uses simple process to obtain the rutile titanium dioxide at low temperature, a high temperature roasting process in a traditional technology can be avoided. The product titanium dioxide can be used for the fields of a catalyst or a catalyst carrier, the byproduct white carbon black can be used as a rubber additive, and hydrochloric acid can be returned for hydro-thermal synthesis and closed cycle usage. The whole technology has the advantages of high resource utilization rate, green environmental protection, low raw material cost, simple process, short flow and easy large-scale production.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of mineral resource processing and preparation of inorganic functional materials, and specifically relates to a method for preparing rutile-type titanium dioxide by using ironmaking by-product—reduced molten titanium slag as a raw material. Background technique [0002] Titanium dioxide (TiO 2 ), commonly known as titanium dioxide, is an important inorganic functional material. It has many advantages such as good photocatalytic activity, photoelectric effect, strong corrosion resistance, good thermal stability, environmental friendliness and relatively low price. It can be used as a photocatalyst, Catalyst carriers, photoelectric materials, fillers or inert components in composite materials, etc., have been widely used in many fields such as environmental protection, chemical industry and electronics. [0003] Titanium dioxide has three crystal forms: rutile, anatase and brookit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 蒋训雄王爱平蒋开喜汪胜东靳冉公周立杰冯林永刘巍范艳青赵磊蒋伟张登高
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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