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Preparation method for special rutile titanium dioxide used for papermaking

A rutile type, titanium dioxide technology, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve the problems of titanium dioxide dispersion, residence rate, and light resistance at the same time, to avoid crystal lattice Effects of defects, improvement of dispersibility, and stabilization of chemical properties

Inactive Publication Date: 2016-04-20
LOMON BILLIONS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the dispersibility, residence rate and light resistance of titanium dioxide for papermaking cannot be taken into account at the same time

Method used

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  • Preparation method for special rutile titanium dioxide used for papermaking
  • Preparation method for special rutile titanium dioxide used for papermaking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Sand mill the kiln products of the calcined qualified sulfuric acid titanium dioxide, and then grind the particle size D 50 The qualified slurry is introduced into the coating tank, and the concentration of the slurry is controlled to be 250g / L (based on TiO 2 At the same time, the temperature was raised to 70°C; the pH of the slurry was adjusted to 2.0 with dilute sulfuric acid; then 1.0% phosphoric acid solution was added and homogenized for 20 minutes; then sodium metaaluminate solution was added to adjust the pH to 6.0 and kept at this pH for aging 60min; finally add 5.0% (as Al 2 o 3 Calculate) sodium metaaluminate solution, and add dilute sulfuric acid solution at the same time to keep the pH of the slurry at 5.0. After the addition, mature for 2 hours; after the coating is completed, perform three washings, flash evaporation, and steam powder. Add 0.5% sodium nitrate solution to steam powder to obtain finished titanium dioxide.

Embodiment 2

[0027] Sand mill the kiln products of the calcined qualified sulfuric acid titanium dioxide, and then grind the particle size D 50 The qualified slurry is introduced into the coating tank, and the concentration of the slurry is controlled to be 270g / L (based on TiO 2 At the same time, the temperature was raised to 70°C; the pH of the slurry was adjusted to 2.0 with dilute sulfuric acid; then 2.0% phosphoric acid solution was added and homogenized for 20 minutes; then sodium metaaluminate solution was added to adjust the pH to 6.5, and the pH was maintained at this pH for aging 60min; finally add 3.0% (as Al 2 o 3 Calculate) sodium metaaluminate solution, and add dilute sulfuric acid solution at the same time to keep the pH of the slurry at 5.5. After the addition, mature for 2 hours; after the coating is completed, perform three washings, flash evaporation, and steam powder. Add 2.0% sodium nitrate solution to steam powder to obtain finished titanium dioxide.

Embodiment 3

[0029] Sand mill the kiln products of the calcined qualified sulfuric acid titanium dioxide, and then grind the particle size D 50 The qualified slurry is introduced into the coating tank, and the concentration of the slurry is controlled to be 300g / L (based on TiO 2 At the same time, the temperature was raised to 70°C; the pH of the slurry was adjusted to 2.5 with dilute sulfuric acid; then 3.5% phosphoric acid solution was added and homogenized for 20 minutes; then sodium metaaluminate solution was added to adjust the pH to 7.0 and kept at this pH for aging 60min; finally add 2.0% (as Al 2 o 3 Calculate) sodium metaaluminate solution, and add dilute sulfuric acid solution at the same time to keep the pH of the slurry at 6.0. After the addition, mature for 2 hours; after the coating is completed, perform three washings, flash evaporation, and steam powder. Add 1.0% potassium nitrate solution to steam powder to obtain finished titanium dioxide.

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Abstract

The invention discloses a preparation method for special rutile titanium dioxide used for papermaking. The preparation method is characterized by comprising the following steps: 1) sanding qualified calcined sulfuric acid-process titanium dioxide from a rotary kiln, then introducing slurry with a qualified sanding particle size into a coated tank, controlling the concentration of the slurry, in terms of TiO2, to be 250 to 350 g / L and carrying out heating to 70 to 75 DEG C; 2) adjusting the pH value of the slurry with dilute sulfuric acid to 2.0 to 3.0; 3) adding a phosphoric acid solution, wherein the concentration of the phosphoric acid solution is 250 to 300 g / L, and in terms of P2O5, the addition amount of the phosphoric acid solution accounts for 1.0 to 5.0 wt% of the total amount of TiO2; 4) adding an aluminum salt solution to adjust a pH value to 6.0 to 7.5 and carrying out curing for 60 min with the pH value maintained; 5) adding the metered aluminum salt solution and a corresponding neutralizing reagent, maintaining the pH value of the slurry to be 5.0 to 6.5 and carrying out curing for 2 h after completion of addition; and 6) carrying out washing three times, flash evaporation and jet milling.

Description

technical field [0001] The invention belongs to a preparation method of special titanium dioxide, in particular to a preparation method of special titanium dioxide for papermaking. Background technique [0002] With the improvement of people's living standards, the demand for decorative paper, advertising paper, and printing paper has increased rapidly, and the demand for titanium dioxide has also grown rapidly. Among the white pigments, titanium dioxide has the advantages of high whiteness, high decolorization power, strong hiding power, high refractive index, and stable physical and chemical properties. It can improve the physical and mechanical properties of paper when used in papermaking. Improve paper opacity, increase smoothness, whiteness and elasticity, reduce moisture absorption and improve printability. Therefore, titanium dioxide is widely used in the manufacture of thin and light banknote paper, aviation paper, picture newspaper, copy paper, advertising paper an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/04C09C3/06
Inventor 吴彭森陈建立豆君于文军张新波卜冬李瑞瑞王欢欢
Owner LOMON BILLIONS GRP CO LTD
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