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Method for preparing titanium-loaded metakaolin serving as mineral admixture

A technology of mineral admixture and metakaolin, which is applied in the field of preparation of titanium-loaded metakaolin, can solve the problems of weak catalyst binding, catalyst instability, easy deactivation, etc., to solve the problem of immobilization, tight binding, and not easy to detach Effect

Active Publication Date: 2015-02-25
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts TiO 2 Mix evenly with kaolin in the form of sol, dry, and then calcinate kaolin into metakaolin with good pozzolanic activity through a one-step calcination method, and make TiO 2 The crystal form is transformed into the anatase type with good photocatalytic activity. After grinding and screening, a mineral admixture with good properties can be used in large quantities in building materials, etc., thus providing a new type of material for building materials and other fields. Active mineral admixtures with photocatalytic properties; and effectively solve the problem of weak combination and easy falling off of the catalyst, the problem of unstable catalyst and easy deactivation, and the problem of pyrite tailings (ie kaolin pyrite tailings) problem solving

Method used

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  • Method for preparing titanium-loaded metakaolin serving as mineral admixture
  • Method for preparing titanium-loaded metakaolin serving as mineral admixture
  • Method for preparing titanium-loaded metakaolin serving as mineral admixture

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Experimental program
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Effect test

Embodiment 1

[0035] A preparation method of titanium-loaded metakaolin used as a mineral admixture, the steps are:

[0036] Raw materials: southern Sichuan pyrite tailings, butyl titanate, glacial acetic acid, absolute ethanol, distilled water;

[0037] 1.1. Raw material preparation: Grinding pyrite tailings to fineness d50≤12um, using sol-gel method (using butyl titanate, glacial acetic acid, absolute ethanol and distilled water at a volume ratio of 26:5:2:1, After mixing evenly, keep stirring on a magnetic stirrer for 2h) to prepare TiO 2 Titanium sol with a solid content of 4.5%;

[0038] 1.2. Mixing and drying of raw materials: Mix the pyrite tailings fine powder and titanium sol in step 1.1 according to the mass ratio of 1:1.1, stir on a magnetic stirrer for 2 hours, and put them into a drying box after mixing evenly. Dry at 80°C;

[0039] 1.3. Calcination load: Put the mixed raw materials obtained in step 1.2 into a medium-temperature furnace for calcination at 750°C for 2 hours. ...

Embodiment 2

[0043] A preparation method of titanium-loaded metakaolin used as a mineral admixture, the steps are:

[0044] Raw materials: southern Sichuan pyrite tailings, butyl titanate, glacial acetic acid, absolute ethanol, distilled water;

[0045] 1.1. Raw material preparation: Grinding pyrite tailings to fineness d50≤12um, using sol-gel method (using butyl titanate, glacial acetic acid, absolute ethanol and distilled water at a volume ratio of 26:5:2:1, After mixing evenly, keep stirring on a magnetic stirrer for 2h) to prepare TiO 2 Titanium sol with a solid content of 4.5%;

[0046] 1.2. Mixing and drying of raw materials: Mix the pyrite tailings fine powder and titanium sol in step 1.1 according to the mass ratio of 1:1.7, stir on a magnetic stirrer for 2 hours, mix well and put it in a drying box Dry at 80°C;

[0047] 1.3. Calcination load: Put the mixed raw materials obtained in step 1.2 into a medium-temperature furnace for calcination at 750°C for 2 hours. After cooling do...

Embodiment 3

[0050] A preparation method of loaded titanium metakaolin used as mineral admixture, comprising the following steps:

[0051] a. Raw material grinding: use a ball mill to grind pyrite tailings (kaolin pyrite tailings) to a median diameter of d 50 ≤12um, to obtain finely ground pyrite tailings;

[0052] b. Preparation of sol: Prepare titanium sol by sol-gel method, that is: take each raw material according to the volume ratio of absolute ethanol: butyl titanate: glacial acetic acid: distilled water as 20: 5: 1: 1, mix and stir for 0.5h (Magnetic stirrer or mechanical stirring device can be used to stir) to obtain titanium sol;

[0053] The titanium sol can also be prepared by other methods in the prior art, such as hydrolysis (i.e. TiCl 4 Added in water and produced by hydrolysis reaction), etc.

[0054] c. Mixing: According to the mass ratio of finely ground pyrite tailings:titanium sol is 1:1, mix the finely ground pyrite tailings and titanium sol (magnetic stirrer or mech...

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Abstract

The invention discloses a method for preparing titanium-loaded metakaolin serving as a mineral admixture. The method is characterized by comprising the following steps: milling pyrite tailings by using a ball mill until the medium diameter d50 is not greater than 12 microns, so as to obtain milled pyrite tailings; preparing titanium sol by adopting a sol-gel method, so as to obtain the titanium sol; mixing the milled pyrite tailings and the titanium sol according to the mass ratio of (1-5): 1, and stirring for 2-4 hours, so as to obtain mixed materials; drying the mixed materials, so as to obtain titanium-loaded kaolin; enabling the titanium-loaded kaolin to be subjected to temperature-preserved calcination for 1-4 hours at the temperature of 450-950 DEG C, thereby obtaining the titanium-loaded metakaolin. According to the method, industrial wastes, namely the pyrite tailings, serve as a kaolin raw material, so that the prepared titanium-loaded metakaolin has good volcanic ash activity and photocatalytic performance and is particularly suitable for serving as a mineral admixture; the method has the advantages that the waste is changed into the valuable, the cost is low, the environment is improved while the stacking of waste residues is reduced, the production process is simple, the energy consumption is low, and the product is good in performance and strong in practicability.

Description

technical field [0001] The invention belongs to the utilization of industrial waste residue—pyrite tailings (kaolin pyrite tailings) and the preparation method of titanium-loaded metakaolin, and relates to a preparation method of titanium-loaded metakaolin used as a mineral admixture . The prepared titanium-loaded metakaolin can be used as a building material admixture in plastering mortar with photocatalytic self-cleaning performance, or in pavement materials with catalytic degradation of automobile exhaust performance, and is also suitable for hospitals, restaurants, etc. Moderate self-cleaning germicidal material. Background technique [0002] The reserves of pyrite in Sichuan Province rank first in the country, and the reserves of pyrite in southern Sichuan account for 97% of the province's reserves. At present, the main problems in the development of pyrite mines in southern Sichuan are poor comprehensive utilization, large loss of resources, low single value of produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78C04B7/34C04B22/06
Inventor 严云张旭胡志华谢斐琳赵春英
Owner SOUTHWEAT UNIV OF SCI & TECH