Preparation method of high-activity calcined seed crystal

A calcined seed crystal, high activity technology, applied in chemical instruments and methods, titanium oxide/hydroxide, inorganic chemistry, etc., can solve problems such as insufficient activity of calcined seed crystals, and achieve the effect of improving quality

Pending Publication Date: 2022-04-22
XIANGYANG LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of insufficient activity of calcined seed crystals in the prior art, the present invention provides a preparation method of highly active calcined seed crystals, the purpose of which is to improve product quality by increasing the activity of calcined seed crystals

Method used

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  • Preparation method of high-activity calcined seed crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method for highly active calcined seed crystals, comprising the following steps:

[0029] Step 1: Preheat the metatitanic acid to 65°C in the metatitanic acid preheating tank, preheat the lye to 115°C in the concentrated alkali high level tank,

[0030] Step 2: Add the preheated metatitanic acid and lye into the alkali dissolution tank at a mass ratio of 1:1.6 and react for 90 minutes to obtain sodium titanate. The concentration of metatitanic acid is 361.5g / L, and the concentration of lye is 620.3 g / L;

[0031] Step 3: Cool the sodium titanate to 60°C, and pump the cooled sodium titanate into an alkali-soluble filter press for washing for 210 minutes to obtain a filter cake;

[0032] Step 4: Put the filter cake into an alkali-soluble beating tank, add desalted water for beating, and obtain a sodium titanate slurry with a concentration of 200 g / L;

[0033] Step 5: Add sodium titanate slurry and hydrochloric acid to the acid-dissolving tank at a mass rati...

Embodiment 2

[0035] A preparation method for highly active calcined seed crystals, comprising the following steps:

[0036] Step 1: Preheat the metatitanic acid to 60°C in the metatitanic acid preheating tank, preheat the lye to 110°C in the concentrated alkali high level tank,

[0037] Step 2: Put the preheated metatitanic acid and lye into the alkali dissolution tank at a mass ratio of 1:1.6 to react for 90 minutes to obtain sodium titanate, the concentration of metatitanic acid is 355.7g / L, and the concentration of lye is 619.58 g / L;

[0038] Step 3: Cool the sodium titanate to 60°C, and pump the cooled sodium titanate into an alkali-soluble filter press for washing for 210 minutes to obtain a filter cake;

[0039] Step 4: Put the filter cake into an alkali-soluble beating tank, add desalted water for beating, and obtain a sodium titanate slurry with a concentration of 210 g / L;

[0040] Step 5: Add sodium titanate slurry and hydrochloric acid to the acid-dissolving tank at a mass rati...

Embodiment 3

[0042] A preparation method for highly active calcined seed crystals, comprising the following steps:

[0043] Step 1: Preheat the metatitanic acid to 55°C in the metatitanic acid preheating tank, preheat the lye to 105°C in the concentrated alkali high level tank,

[0044] Step 2: Put the preheated metatitanic acid and lye into the alkali dissolution tank at a mass ratio of 1:1.6 to react for 80 minutes to obtain sodium titanate, the concentration of metatitanic acid is 360.4g / L, and the concentration of lye is 630g / L;

[0045] Step 3: Cool the sodium titanate to 55°C, and pump the cooled sodium titanate into an alkali-soluble filter press for washing for 210 minutes to obtain a filter cake;

[0046] Step 4: Put the filter cake into an alkali-soluble beating tank, add desalted water for beating, and obtain a sodium titanate slurry with a concentration of 190 g / L;

[0047] Step 5: Add sodium titanate slurry and hydrochloric acid into the acid-dissolving tank at a mass ratio...

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Abstract

The invention discloses a preparation method of a high-activity calcined seed crystal, and solves the problem of insufficient activity of the calcined seed crystal in the prior art. The method comprises the following steps: 1, preheating metatitanic acid and alkali liquor; 2, adding metatitanic acid and alkali liquor into an alkali dissolution tank according to the mass ratio of 1: 1.6, and reacting to obtain sodium titanate; 3, cooling the sodium titanate, and then pumping the cooled sodium titanate into an alkali dissolution filter press for washing to obtain a filter cake; 4, putting the filter cake into an alkali dissolution pulping tank, and adding desalted water for pulping to obtain sodium titanate slurry; and 5, adding the sodium titanate slurry and hydrochloric acid in a mass ratio of 1: (0.15-0.17) into an acid dissolution tank for reaction, heating to 55-65 DEG C, adding hydrochloric acid into the acid dissolution tank according to a mass ratio of hydrochloric acid to sodium titanate of (0.2-0.25): 1 for peptization, heating to 99-103 DEG C, keeping boiling for 85-95 minutes to obtain rutile type TiO2 seed crystal, and adding water to dilute until the concentration is 90-120 g / L to obtain the high-activity calcined seed crystal. The activity of the prepared calcined seed crystal is improved from about 98% to 99.5% or above, and the product quality is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method for preparing high-activity calcined seed crystals. Background technique [0002] In the production process of titanium dioxide, calcination is a very important step. Its purpose is to dehydrate and desulfurize metatitanic acid through high-temperature calcination, and transform it into pigment-grade titanium dioxide with a certain crystal form and particle size and a certain quality index. Among them, the quality of calcined seed crystals seriously affects the calcining effect. One of the main indicators to measure the quality of calcined seed crystals is the activity of calcined seed crystals. [0003] In a sense, improving the activity of calcined seed crystals means improving product quality. Experiments are conducted to explore the alkali concentration and metatitanic acid concentration in the alkali-soluble stage of the calcined seed crysta...

Claims

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Application Information

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IPC IPC(8): C01G23/053C01G23/00
CPCC01G23/053C01G23/005
Inventor 曾小林何燕燕王国锋唐臣成
Owner XIANGYANG LOMON TITANIUM IND CO LTD
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