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Preparation method for additional hydrolysis crystal seed for titanium dioxide for denitration

The technology of titanium dioxide and crystal seed is applied in the field of preparation of titanium dioxide for denitration and hydrolyzed seed crystal, which can solve the problems of high content of rutile in seed crystal, high requirement of raw material purity, inapplicability, etc., and achieves low equipment requirements, short technological process, and easy operation. simple effect

Inactive Publication Date: 2018-10-12
LOMON BILLIONS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent 200610039318 discloses a preparation method of hydrolyzed seed crystals for producing titanium dioxide. The method prepares crystal seeds by mixing sodium hydroxide and titanyl sulfate solution, and performs hydrolysis of external seed crystals. Although the preparation time of seed crystals is shortened, Reduce the concentration of concentrated titanyl sulfate solution in the previous process, improve the pigment and optical properties of titanium dioxide, but the pore size of the titanium dioxide prepared by it is only about 5-10nm, and it is used for performance optimization of pigment titanium dioxide, not suitable for denitrification Preparation of Titanium Dioxide for Catalyst
[0005] Chinese patent 201010202414.4 discloses a method for preparing titanium dioxide plus hydrolyzed seed crystals. The method uses TiCl 4 As a titanium source, seed crystals are prepared. Although this method has a simple process, low equipment requirements, and stable seed crystal activity, the purity of raw materials is high, and the rutile content of the prepared seed crystals is high, which is not suitable for denitrification titanium dioxide with high specific surface area. application requirements

Method used

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  • Preparation method for additional hydrolysis crystal seed for titanium dioxide for denitration
  • Preparation method for additional hydrolysis crystal seed for titanium dioxide for denitration
  • Preparation method for additional hydrolysis crystal seed for titanium dioxide for denitration

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Step1. Take TiO that meets the titanium liquid index 2 The concentration is 170g / L, Ti 3+ The concentration is 1.7g / L, Fe 2+ / TiO 2 The ratio is 0.35, the F value is 1.73, and the specific gravity is 1.532 industrial-grade titanium liquid, and the temperature is raised to 70°C;

[0032] Step2, prepare a sodium hydroxide solution with a concentration of 2.3mol / L, and raise the temperature to 70°C;

[0033] Step3. Add the titanium solution into the sodium hydroxide solution, stir evenly, raise the temperature to 95°C, and keep it warm for 15 minutes to mature;

[0034] Step4, the stability of the seed crystal reaches 120ml, and the hydrolysis reaction is carried out to obtain the seed crystal;

[0035] In this example, according to NaOH:TiO 2 =0.35:1 (molar ratio) to prepare titanium solution and sodium hydroxide solution.

Embodiment 2

[0037] Step1. Take TiO that meets the titanium liquid index 2 The concentration is 170g / L, Ti 3+ The concentration is 0.9g / L, Fe 2+ / TiO 2 The ratio is 0.31, the F value is 1.80, and the specific gravity is 1.525 industrial-grade titanium liquid, and the temperature is raised to 75°C;

[0038] Step2, prepare a sodium hydroxide solution with a concentration of 3.5mol / L, and raise the temperature to 75°C;

[0039] Step3. Add the titanium solution into the sodium hydroxide solution, stir evenly, raise the temperature to 100°C, and keep it warm for 15 minutes to mature;

[0040] Step4, the stability of the seed crystal reaches 100ml, and the hydrolysis reaction is carried out to obtain the seed crystal;

[0041] In this example, according to NaOH:TiO 2 =1:1 (molar ratio) to prepare titanium solution and sodium hydroxide solution.

Embodiment 3

[0043] Step1. Take TiO that meets the titanium liquid index 2 The concentration is 200g / L, Ti 3+ The concentration is 2.3g / L, Fe 2+ / TiO 2 The ratio is 0.29, the F value is 1.90, and the specific gravity is 1.532 industrial grade titanium liquid, heated up to 90 ℃;

[0044] Step2, prepare a sodium hydroxide solution with a concentration of 6.0mol / L, and raise the temperature to 90°C;

[0045] Step3. Add the titanium solution into the sodium hydroxide solution, stir evenly, raise the temperature to 110°C, and keep it warm for 8 minutes to mature;

[0046] Step4, the stability of the seed crystal reaches 90ml, and the hydrolysis reaction is carried out to obtain the seed crystal;

[0047] In this example, according to NaOH:TiO 2 =4.5:1 (molar ratio) to prepare titanium solution and sodium hydroxide solution.

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Abstract

The invention discloses a preparation method for an additional hydrolysis crystal seed for titanium dioxide for denitration. The preparation method comprises the following steps of Step 1, selecting an industrial titanium solution meeting titanium solution indexes, and heating to 70 to 90 DEG C; Step 2, preparing a sodium hydroxide solution with concentration of 2.0 to 6.0mol / L, and heating to 70to 90 DEG C; Step 3, adding the titanium solution in step 1 into the obtained sodium hydroxide solution in step 2, uniformly stirring, heating to 90 to 120 DEG C, warming for 0 to 90min, and aging; Step 4, when the stability of the crystal seed reaches 150ml or below, hydrolyzing, so as to obtain the crystal seed. The preparation method has the advantages that the black titanium solution using sulfuric acid as the raw material has low requirement on equipment, the activity of the prepared hydrolysis crystal seed is high, and the produced titanium dioxide for denitration is suitable for the extrusion and forming process in the production of denitration catalysts.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide production, in particular to a preparation method of titanium dioxide for denitrification plus hydrolysis seeds. Background technique [0002] In recent years, my country has often been attacked by smog and acid rain, which has greatly increased the country's environmental protection efforts, especially regarding the emissions of nitrogen oxides and sulfur oxides. The National Development and Reform Commission has mandated that all coal-fired power plants, coal-fired boilers, and coal chemical plants Install desulfurization, denitrification and dust removal facilities. At the same time, accelerate the introduction of new pollutant discharge standards for coal-fired facilities such as thermal power generation, coking, building materials, and coal-fired boilers, add pollutant discharge indicators, and further tighten pollutant discharge limits. In addition, the operation inspection of envir...

Claims

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Application Information

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IPC IPC(8): C01G23/053B01J21/06B01J35/10
CPCC01G23/053B01J21/063B01J35/647
Inventor 陈建立王荣荣栗玉叶
Owner LOMON BILLIONS GRP CO LTD