Method for preparing rutile titanium dioxide with high tinctorial strength

A rutile titanium dioxide and achromatic technology, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of easy agglomeration and poor achromatic power of titanium dioxide, achieve uniform particle size distribution, improve gloss and whiteness , the effect of improving the purity

Inactive Publication Date: 2020-07-17
GUANGXI JINMAO TITANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of poor achromatic power and easy agglomeration of titanium dioxide, the present invention provides a method for preparing rutile titanium dioxide with high achromatic power

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing high decolorizing power rutile titanium dioxide, comprising the steps of:

[0030] (1) Add 2 times concentrated sulfuric acid to titanium concentrate for acid hydrolysis to obtain titanium suspension, add maleic anhydride-styrene sulfonic acid copolymer and lignin with a mass ratio of 3:2:1 to the titanium suspension The flocculant composed of sodium sulfonate and polyaluminum chloride is used for impurity removal treatment. The amount of flocculant added is 1.5% of the mass of titanium concentrate, and it is left to stand for 24 hours. An adsorbent with 1.0% concentrate quality, the adsorbent is composed of diatomite and zeolite molecular sieve with a mass ratio of 1:1, press-filtered for solid-liquid separation, the liquid after press-filtering enters the vacuum crystallization system, passes through the disc The separator removes ferrous sulfate heptahydrate, and then adds an adsorbent with 0.5% of titanium concentrate mass for secondary pressu...

Embodiment 2

[0035] A method for preparing high decolorizing power rutile titanium dioxide, comprising the steps of:

[0036] (1) Add 1.6 times concentrated sulfuric acid to titanium concentrate for acid hydrolysis to obtain titanium suspension, add maleic anhydride-styrene sulfonic acid copolymer and lignin with a mass ratio of 5:2:1 to the titanium suspension The flocculant composed of sodium sulfonate and polyaluminum chloride is used for impurity removal treatment. The amount of flocculant added is 1.8% of the mass of titanium concentrate, and it is left to stand for 12 hours. An adsorbent with 0.5% concentrate quality, the adsorbent is composed of diatomite and zeolite molecular sieve with a mass ratio of 1:2, press-filtered for solid-liquid separation, the liquid after press-filtering enters the vacuum crystallization system, passes through the disc The separator removes ferrous sulfate heptahydrate, and then adds an adsorbent with 0.5% of titanium concentrate mass for secondary pres...

Embodiment 3

[0041] A method for preparing high decolorizing power rutile titanium dioxide, comprising the steps of:

[0042] (1) Add 2 times concentrated sulfuric acid to titanium concentrate for acid hydrolysis to obtain titanium suspension, add maleic anhydride-styrene sulfonic acid copolymer, lignin with a mass ratio of 3:1:1 to the titanium suspension The flocculant composed of sodium sulfonate and polyaluminum chloride is used for impurity removal treatment. The amount of flocculant added is 1.0% of the mass of titanium concentrate. After standing for 24 hours, the upper half of the clear liquid is taken out and sent to the first-stage filter, and titanium An adsorbent with 1.0% concentrate quality, the adsorbent is composed of diatomite and zeolite molecular sieve with a mass ratio of 1:1, press-filtered for solid-liquid separation, the liquid after press-filtering enters the vacuum crystallization system, passes through the disc The separator removes ferrous sulfate heptahydrate, a...

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Abstract

The invention discloses a method for preparing rutile titanium dioxide with high tinctorial strength, which comprises the following steps: adding sulfuric acid into titanium concentrate for acidolysisto obtain a titanium suspension, and adding a flocculant composed of maleic anhydride-styrene sulfonic acid copolymer, sodium lignin sulfonate and polyaluminum chloride into the titanium suspension for impurity removal treatment to obtain a refined titanium solution; adding rutile seed crystals and a dispersing agent into the refined titanium solution for hydrolysis to obtain a hydrolysate; washing the hydrolysate with water, adding sulfuric acid for bleaching, and washing for a second time to obtain a slurry; adding a salt solution treating agent consisting of a phosphate solution, a zinc acetate solution and a yttrium nitrate solution into the slurry; and carrying out filter pressing on the slurry by using a filter press, calcining a filter cake in a rotary kiln, cooling, and crushing to obtain rutile titanium dioxide. The rutile content of the rutile titanium dioxide prepared through the method reaches 98.5% or above, the whiteness reaches 98% or above, the Tcs value reaches 2034 or above, the Scx value reaches 4.21 or above, and the product is uniform in particle size distribution and good in dispersity and is an excellent white pigment.

Description

technical field [0001] The invention belongs to the technical field of producing titanium dioxide, in particular to a method for preparing rutile titanium dioxide with high decolorizing power. Background technique [0002] Titanium dioxide, namely titanium dioxide, is an important inorganic chemical raw material. Because of its non-toxic, stable physical and chemical properties, excellent optical and electrical properties and excellent pigment performance, it is widely used in coatings, inks, plastics, rubber, paper, chemical fibers, art pigments, daily cosmetics, enamel, ceramics, electronics, etc. and other fields. The production method of rutile titanium dioxide is the sulfuric acid method. The ferrotitanium powder and concentrated sulfuric acid are subjected to acidolysis reaction to generate the intermediate titanyl sulfate. The titanyl sulfate needs to be hydrolyzed into metatitanic acid and sulfuric acid, and the metatitanic acid is washed with water, calcined, Tita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/0534C01P2006/80C01P2006/22C01P2006/60
Inventor 覃愿许定文李广欣邓志军梁燕华郭小凤杨曙光覃进文
Owner GUANGXI JINMAO TITANIUM
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