CN102060302A

CN102060302A - Process for preparing superfine high-activity metakaolin by utilizing vertical high-pressure mill

Info

Publication number: CN102060302A
Application number: CN2010105329731A
Authority: CN
Inventors: 赵智承; 赵宇驰; 周志辉; 周建国
Original assignee: INNER MONGOLIA TIANZHIJIAO KAOLIN EARTH CO Ltd
Current assignee: INNER MONGOLIA TIANZHIJIAO KAOLIN EARTH CO Ltd
Priority date: 2010-10-29
Filing date: 2010-10-29
Publication date: 2011-05-18

Abstract

The invention relates to a process for preparing superfine high-activity metakaolin by utilizing a vertical high-pressure mill, which is characterized by comprising the following steps of: firstly, crushing crude ore of metakaolin into 325+/-30 meshes, grinding the crushed crude ore by the vertical high-pressure mill to obtain a superfine high-activity metakaolin powdery material with a particle size of 2-2.5mum, then conveying the superfine metakaolin to a rotary kiln feeding system by a fan, adding the superfine metakaolin into a rotary kiln by an automatic feeding machine, then carrying out high-temperature calcining on the superfine metakaolin in the rotary kiln with the temperature of 600-900 DEG C and the calcining time of 1-4 h, and preparing a superfine metakaolin product. The process has the advantages that the production cost is greatly reduced, the occupied area is only 50% of that of a ball mill system, the production efficiency is high, the energy is saved, the environment is protected, the granularity of a product is fine and uniform, the particle size of the product is 2.1-3.0mum, the minimum particle size can be controlled to be 2mum, and the uniformity is over 90%.

Description

A kind ofly utilize vertical high pressure to grind the fully technology of ultrafine high activity metakaolin

Technical field

The present invention relates to a kind ofly utilize vertical high pressure to grind the fully technology of ultrafine high activity metakaolin, belong to the preparation technology field of metakaolin.

Background technology

At present, the technological process of production of domestic processing coal measures calcined kaolin products, many data are generally acknowledged and to be recommended as: raw ore, coarse crushing, ultra-fine, pulverizing, classification, calcining, depolymerization, break up, the packing of product.Vertical high pressure mill is the large-scale milling equipment of a kind of ideal, is widely used in industries such as cement, electric power, metallurgy, chemical industry, nonmetalliferous ore.It integrates fragmentation, drying, grinding, classification carries, and the production efficiency height can be worn into desired pulverulent material with block, particulate state and powder raw material.

The general technology that adopts of the preparation of metakaolin at present is calcining process systems such as tunnel furnace, retort furnace, and this technology has that production efficiency is low, turnout is little, energy consumption is high determines.

Summary of the invention

The purpose of this invention is to provide and a kind ofly utilize vertical high pressure to grind fully ultrafine kaolin, and with the technology of ultrafine kaolin through the highly active metakaolin of rotary kiln high-temperature activation calcining preparation.

Technology of the present invention is: earlier with kaolin crushing raw ore to 325 ± 30 orders, again by obtaining the ultrafine kaolin powder body material that granular size is 2～2.5 μ m behind the vertical high pressure barreling mill, the back is sent to the rotary kiln charging system by blower fan with this ultrafine kaolin, through automatic charging equipment, ultrafine kaolin is added in the rotary kiln, through 600～900 ℃ of high-temperature calcinations, calcination time is 1～4 hour, the ultra-fine metakaolin product of preparing in rotary kiln in the back.

Advantage of the present invention is:

1. production investment cost significantly reduces, because vertical high pressure grinding system is simple, compact in design, floor space only are 50% of ball mill system, and can arrange in the open, have directly reduced the enterprise investment expense;

2. production efficiency height, energy-conserving and environment-protective, the energy consumption of vertical high pressure grinding system is compared with milling system and is saved 30%～40%; The total system vibrations are little, and noise is low, and the equipment integral sealing, and system works under negative pressure, non-flour dust overflow, and clean environment satisfies national requirements for environmental protection.Working mechanism changes, and wearing and tearing reduce, and service life of a machine prolongs;

3. the drying materials ability is strong;

4. easy and simple to handle, maintenance of equipment is convenient, is equipped with automatic control system, can realize Long-distance Control, and is easy and simple to handle; By the maintenance oil cylinder, the upset swing arm can convenient and swift replacing roller shell, liner plate, reduces enterprise's shutdown loss;

5. constant product quality, the material residence time in body is short, is easy to detect and control product granularity and chemical ingredients, reduces mill to death, stabilized product quality;

6. the granularity of product is tiny, even, utilizes vertical high pressure to grind the product that is equipped with, and its particle diameter is at 2.1～3.0 μ m, and minimum grain size can be controlled at 2 μ m, and uniformity coefficient surpasses 90%;

7. product activity height, active (will wait the reactive behavior of mole metakaolin and activated alumina to compare, its value is a zero dimension) is 75.2%～97.8%.

Embodiment

Embodiment 1: be raw material with the Coaseries kaolin, through pulverizing, vertical high pressure barreling mill, in rotary kiln, through 600 ℃ of calcinings 2 hours, after break up, the metakaolin mean particle size of preparation is 2.1 μ m, activity is 75.2%.

Embodiment 2: be raw material with the Coaseries kaolin, through pulverizing, vertical high pressure barreling mill, in rotary kiln, through 700 ℃ of calcinings 2 hours, after break up, the metakaolin mean particle size of preparation is 2.3 μ m, activity is 92.7%.

Embodiment 3: be raw material with the Coaseries kaolin, through pulverizing, vertical high pressure barreling mill, in rotary kiln, through 750 ℃ of calcinings 2 hours, after break up, the metakaolin mean particle size of preparation is 2.5 μ m, activity is 97.8%.

Embodiment 4: be raw material with the Coaseries kaolin, through pulverizing, vertical high pressure barreling mill, in rotary kiln, through 800 ℃ of calcinings 2 hours, after break up, the metakaolin mean particle size of preparation is 2.8 μ m, activity is 91.5%.

Embodiment 5: be raw material with the Coaseries kaolin, through pulverizing, vertical high pressure barreling mill, in rotary kiln, through 000 ℃ of calcining 2 hours, after break up, the metakaolin mean particle size of preparation is 3.0 μ m, activity is 79.5%.

Claims

1. one kind is utilized vertical high pressure to grind the technology of ultrafine high activity metakaolin fully, it is characterized in that: earlier with kaolin crushing raw ore to 325 ± 30 orders, again by obtaining the ultrafine kaolin powder body material that granular size is 2～2.5 μ m behind the vertical high pressure barreling mill, the back is sent to the rotary kiln charging system by blower fan with this ultrafine kaolin, through automatic charging equipment, ultrafine kaolin is added in the rotary kiln, the back in rotary kiln through 600～900 ℃ of high-temperature calcinations, calcination time is 1～4 hour, the ultra-fine metakaolin product of preparing.