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A method for producing high-purity electronic titanium dioxide

A titanium dioxide and electronic technology, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of high-end electronic grade titanium dioxide, large particle size, and high cost, and achieve remarkable impurity removal effect and particle size distribution narrow effect

Active Publication Date: 2022-05-27
GUANGXI JINMAO TITANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the existing high-purity electronic grade titanium dioxide is produced by the chlorination process, but the cost of this method is high
At present, most of the sulfuric acid method is used to prepare titanium dioxide, but this process can only produce low-end electronic grade titanium dioxide, with large particle size and low purity, which cannot meet the requirements of high-end electronic grade titanium dioxide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for producing high-purity electronic titanium dioxide, comprising the following steps:

[0027] (1) Select 90% Panzhihua ilmenite concentrate + 10% Vietnam ilmenite concentrate as raw materials, which can satisfy Cr2O3≤0.1%, MnO≤1%, Nb2O5≤0.02%, and use 2 times (mass) sulfuric acid to acidify titanium concentrate After the ore is mined, an acid-hydrolyzed titanium suspension is obtained, and a flocculation consisting of maleic anhydride-styrene sulfonic acid copolymer, sodium lignosulfonate and polyaluminum chloride with a mass ratio of 2:1:1 is added to the acid-hydrolyzed titanium suspension. The amount of the flocculant added is 1.5% of the mass of the ilmenite concentrate. After standing for 24 hours, the upper part of the supernatant is extracted and transported to the first-stage filter press, and 0.5% of the mass of the ilmenite concentrate is added as an adsorbent. , the adsorbent is composed of diatomite and zeolite molecular sieve with a mass ratio of...

Embodiment 2

[0033] A method for producing high-purity electronic titanium dioxide, comprising the following steps:

[0034](1) Select 95% Panzhihua titanium concentrate + 5% Chengde titanium concentrate as raw materials, which can satisfy Cr2O3≤0.1%, MnO≤1%, Nb2O5≤0.02%, and use 1.5 times (mass) sulfuric acid to acidify titanium concentrate After the ore is mined, an acid-hydrolyzed titanium suspension is obtained, and a flocculation composed of maleic anhydride-styrene sulfonic acid copolymer, sodium lignosulfonate and polyaluminum chloride with a mass ratio of 3:2:1 is added to the acid-hydrolyzed titanium suspension. The amount of the flocculant added is 1.5% of the mass of the titanium concentrate. After standing for 24 hours, the upper part of the supernatant is extracted and sent to the first-stage filter press, and 0.8% of the mass of the titanium concentrate is added. , the adsorbent is composed of diatomite and zeolite molecular sieve with a mass ratio of 1:2, press filtration, a...

Embodiment 3

[0040] A method for producing high-purity electronic titanium dioxide, comprising the following steps:

[0041] (1) Select 80% Panzhihua ilmenite concentrate + 20% Vietnam ilmenite concentrate as raw materials, which can satisfy Cr2O3≤0.1%, MnO≤1%, Nb2O5≤0.02%, and use 1.8 times (mass) sulfuric acid to acidify titanium concentrate After the ore is mined, an acid-degraded titanium suspension is obtained, and a flocculation composed of maleic anhydride-styrene sulfonic acid copolymer, sodium lignosulfonate and polyaluminum chloride with a mass ratio of 5:3:1 is added to the acid-degraded titanium suspension. The amount of the flocculant added is 1.2% of the mass of the ilmenite concentrate. After standing for 24 hours, the upper part of the supernatant is extracted and sent to the first-stage filter press, and the adsorbent of 0.8% of the mass of the ilmenite concentrate is added. , the adsorbent is composed of diatomite and zeolite molecular sieve with a mass ratio of 1:1, pres...

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PUM

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Abstract

The invention discloses a method for producing high-purity electronic titanium dioxide. Panzhihua titanium concentrate ≥ 80% is selected as a raw material, the titanium concentrate is hydrolyzed with sulfuric acid, and maleic anhydride-styrenesulfonic acid copolymer and ligninsulfonic acid are added. The flocculant composed of sodium bicarbonate and polyaluminum chloride is used for impurity removal treatment, standing still, and press-filtered for solid-liquid separation. The liquid after press-filtering enters the vacuum crystallization system, and is subjected to secondary press-filtering to obtain refined titanium liquid; the refined titanium liquid is Add water to adjust to 95~200g / L, heat up and stir, then add crystal form control agent to react to obtain hydrolyzate; wash the hydrolyzate until the iron ion content is below 150ppm, then add sulfuric acid for bleaching, and wash twice with water until the iron ion content is below 150ppm When the concentration is below 50ppm, a slurry is obtained; after being pressed by a filter press, the filter cake is calcined in a rotary kiln and crushed to obtain titanium dioxide for electronics. The purity of the titanium dioxide product prepared by this method reaches more than 99.5%, the particle size distribution is 200-400nm, the particle size distribution is narrow, the particle size distribution is uniform, and the powder whiteness reaches more than 90%, which can meet the requirements of high-end electronic grade titanium dioxide.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide production, in particular to a method for producing high-purity electronic titanium dioxide. 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, enamels, ceramics, electronics and other fields. Titanium dioxide for electronic grade (high purity titanium dioxide) is one of the main crystalline phase raw materials for new electronic components, and is widely used in PTC thermistors, MLCCs, semiconductor capacitors, semiconductor ceramics and piezoelectric ceramics and other fields. As one of the main raw materials for the manufacture of such electronic materials, high-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
CPCC01G23/0532C01P2006/80C01P2004/62C01P2006/60
Inventor 覃愿黎华挺许定文李广欣梁燕华郭小凤杨曙光覃进文甘庆军
Owner GUANGXI JINMAO TITANIUM