Method for preparing titanium dioxide from high-titanium coal gangue

A technology of coal gangue and titanium dioxide, which is applied in the removal of titanium dioxide, solid waste, titanium oxide/hydroxide, etc., can solve the problems of secondary pollution and low efficiency, and achieve high utilization rate, convenient operation and acid utilization rate. high effect

Active Publication Date: 2015-04-01
KUNMING UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] To sum up, my country has done a lot of work in the comprehensive utilization of coal gangue resources, but there are generally problems such as low efficiency and secondary pollution. Coal gangue is used for cement admixtures, production of building blocks, glass-ceramics, Polyaluminum chloride, fertilizers, etc. have been reported, but the production of titanium dioxide using titanium-containing coal gangue as raw material has not been reported

Method used

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  • Method for preparing titanium dioxide from high-titanium coal gangue

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Add 98% concentrated sulfuric acid to coal gangue (titanium dioxide content 4.0%, ground through 80-mesh standard sieve), heat with microwaves, react for 1 hour, add water with a mass 4 times the mass of coal gangue after the reaction is completed, Place it in a water bath at 30°C to fully dissolve, and filter to obtain an acid leaching solution, in which concentrated sulfuric acid and coal gangue are in a mass ratio of 1.4:1, and TiO in the acid leaching solution 2 、 Al 2 o 3 , T Fe The contents are 4.79g / L, 28.92g / L, 19.58g / L respectively;

[0030](2) Add sodium carbonate to the acid leaching solution to neutralize and adjust the pH of the acid leaching solution to 1 to prepare an acid leaching neutralization solution;

[0031] (3) Add excess iron wire to the acid leaching neutralization solution to reduce the ferric iron in it, filter after the reduction reaction is completed, dilute the neutralization solution according to the volume ratio of the filtrate and...

Embodiment 2

[0035] (1) Add 98% concentrated sulfuric acid to coal gangue (titanium dioxide content 5.0%, ground through a 80-mesh standard sieve), heat with microwaves, and react for 1.2 hours. After the reaction is completed, add water 4.5 times the mass of gangue , placed in a water bath at 50°C to fully dissolve, and filtered to obtain an acid leaching solution, in which concentrated sulfuric acid and coal gangue are in a mass ratio of 1.6:1; TiO in the acid leaching solution 2 、 Al 2 o 3 , T Fe The contents are 5.15g / L, 29.37g / L, 19.82g / L respectively;

[0036] (2) Add sodium carbonate to the acid leaching solution to neutralize and adjust the pH of the acid leaching solution to 1.5 to prepare an acid leaching neutralization solution;

[0037] (3) Add excess iron wire to the acid leaching neutralization solution to reduce the ferric iron in it, filter after the reduction reaction is completed, dilute the neutralization solution according to the volume ratio of the filtrate and wate...

Embodiment 3

[0041] (1) Add 98% concentrated sulfuric acid to coal gangue (3.45% titanium dioxide content, ground through a 80-mesh standard sieve), heat it with microwaves, and react for 1.6 hours. After the reaction is completed, add water five times the mass of coal gangue , placed in a water bath at 30°C to fully dissolve, and filtered to obtain an acid leaching solution, in which concentrated sulfuric acid and coal gangue are in a mass ratio of 1.6:1; TiO in the acid leaching solution 2 、 Al 2 o 3 , T Fe The contents are 3.75g / L, 22.36g / L, 16.20g / L respectively;

[0042] (2) Add potassium carbonate to the acid leaching solution to neutralize and adjust the pH of the acid leaching solution to 1.0 to prepare an acid leaching neutralization solution;

[0043] (3) Add excess aluminum powder to the acid leaching neutralization solution to reduce the ferric iron in it, filter after the reduction reaction is completed, dilute the neutralization solution according to the volume ratio of th...

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Abstract

The invention discloses a method for preparing titanium dioxide from high-titanium coal gangue, and belongs to the technical field of resourceful utilization of coal-series solid wastes. A new technology is provided for resourceful utilization of cal gangue by taking high-titanium coal gangue as a raw material for producing titanium dioxide. The method comprises: mixing sulfuric acid and goal gangue subjected to grinding and sieved by a 80 mesh sieve according to the mass ratio of 1.4-1.6:1, performing acidification reaction in a microwave oven, and performing dissolving and filtering to prepare an acid immersion liquid; performing neutralization, reduction and dilution on the acid immersion liquid, adding sodium carbonate or potassium carbonate to adjust pH to 4.5, separating to obtain a titanium dioxide precursor, performing alkali dissolution on the precursor to obtain crude titanium, dissolving the crude titanium with a diluted acid for removing impurities, filtering to obtain refined hydrated titanium dioxide, and calcining at 800 DEG C to prepare titanium dioxide. The method is capable of extracting aluminium and iron while preparing titanium dioxide, the usage amount and the utilization rate of coal gangue are high, auxiliary materials do not need adding, and the method has the advantages of being simple in production technology, convenient to operate, low in energy consumption, stable in product quality, easy for industrialized production and the like.

Description

technical field [0001] The invention relates to a method for preparing titanium dioxide from high-titanium coal gangue, and belongs to the technical field of resource utilization of coal series solid waste. Background technique [0002] The output of coal gangue accounts for 15%-20% of the total coal output. At present, my country’s coal gangue has accumulated more than 5 billion tons. Except for a small amount of coal gangue in my country, it is used in cement, sintered bricks, ceramsite, underground filling, extraction of aluminum, iron, and silicon. Apart from the use of other valuable elements, most of them are stockpiled. The resource utilization of coal gangue has become a major resource and environmental problem that must be solved in the sustainable development of our country. The research on the preparation of chemical products by acid leaching of coal gangue is of great significance for saving resources, improving the environment, and improving economic and social b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B09B3/00
CPCY02W30/82C01G23/053C01P2006/80
Inventor 夏举佩自桂芹
Owner KUNMING UNIV OF SCI & TECH
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