Preparation method of superfine calcined kaolin powder

A technology of kaolin and activated kaolin, which is applied in the field of preparation of calcined kaolin superfine powder, can solve problems such as poor resistance to sulfate erosion, affecting material properties, and slightly poor dry shrinkage performance

Inactive Publication Date: 2018-05-18
RUITAI MATERIALS TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After calcined at 600-700℃, kaolin has the greatest activity, and the content of molten alumina is the highest after being leached by NaOH solution. After being mixed with cement or concrete, it has the best strength, good coagulation and frost resistance, and slightly poor dry shrinkage performance. , but due to the soluble Al and SO in burnt clay 3 and other reactions to form ettringite (3XaO·Al 2 o 3 • 3XaSO 4 •32H 2 O), the material has poor resistance to sulfate attack
In the same way, in refractory concrete, the soluble Al in the burnt clay participates in the reaction too fast and also affects the performance of the material.

Method used

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  • Preparation method of superfine calcined kaolin powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Select the chemical composition of kaolin as: Al 2 o 3 =37.22%, SiO 2 =46.58%, Fe 2 o 3 =0.63%, TiO 2 =0.46%, CaO=0.14%, MgO=0.06%, K 2 O=0.26%, Na 2 O=0.09%, Loss=14.46%. The kaolin fine-grained ore is dried and ground to <0.088mm, and then sent to a fluidized device for calcination at 900°C×30s. The calculation formula for the calcination time is "calcination time = length of the fluidized calcination device / average flow rate of the device", The calcined materials are processed to ≤0.044mm calcined kaolin superfine powder and ≤0.010mm fine powder, which are used to configure clay bricks for glass kiln tin baths. The ratio is: 51.5% of 8-1mm burnt gemstone, 19.8% of <1mm burnt gemstone, 10.1% of <0.088mm burnt gemstone, 4.6% of <0.088mm kaolin-based mullite, 4.4% of <0.044mm kaolin fine powder, <0.010mm Kaolin micropowder 4.6%, silica fume 2%, pure calcium aluminate cement 3%.

[0014] After adding water and molding, the 1-day flexural strength is 3.5MPa, whic...

Embodiment 2

[0016] Select the chemical composition of kaolin as: Al 2 o 3 =37.22%, SiO 2 =46.58%, Fe 2 o 3 =0.63%, TiO 2 =0.46%, CaO=0.14%, MgO=0.06%, K 2 O=0.26%, Na 2 O=0.09%, Loss=14.46%. The kaolin fine-grained ore is dried and ground to <0.088mm, and then sent to a fluidized device for calcination at 1100°C×20s. The calculation formula for the calcination time is "calcination time = length of the fluidized calcination device / average flow rate of the device", The calcined materials are processed to ≤0.044mm calcined kaolin superfine powder and ≤0.010mm fine powder, which are used to configure clay bricks for glass kiln tin baths. The ratio is: 51.5% of 8-1mm burnt gemstone, 19.8% of <1mm burnt gemstone, 10.1% of <0.088mm burnt gemstone, 4.6% of <0.088mm kaolin-based mullite, 4.4% of <0.044mm kaolin fine powder, <0.010mm Kaolin micropowder 4.6%, silica fume 2%, pure calcium aluminate cement 3%. After adding water and forming, the flexural strength of 1 day is 3.6MPa, which mee...

Embodiment 3

[0018] Select the chemical composition of kaolin as: Al 2 o 3 =37.22%, SiO 2 =46.58%, Fe 2 o 3 =0.63%, TiO 2 =0.46%, CaO=0.14%, MgO=0.06%, K 2 O=0.26%, Na 2 O=0.09%, Loss=14.46%. The kaolin fine-grained ore is dried and ground to <0.088mm, and then sent to a fluidized device for calcination at 1200°C×15s. The calculation formula for the calcination time is "calcination time = length of the fluidized calcination device / average flow rate of the device", The calcined materials are processed to ≤0.044mm calcined kaolin superfine powder and ≤0.010mm fine powder, which are used to configure clay bricks for glass kiln tin baths. The ratio is: 51.5% of 8-1mm burnt gemstone, 19.8% of <1mm burnt gemstone, 10.1% of <0.088mm burnt gemstone, 4.6% of <0.088mm kaolin-based mullite, 4.4% of <0.044mm kaolin fine powder, <0.010mm Kaolin micropowder 4.6%, silica fume 2%, pure calcium aluminate cement 3%. After forming with water, the flexural strength of 1 day is 3.65MPa, which meets th...

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Abstract

The invention relates to a preparation method of active kaolin powder. The method comprises the following steps: grinding and homogenizing kaolin raw materials in a vertical drying mill, feeding powder into a three-stage preheating cylinder, feeding the powder into a calcining furnace to complete flash calcination, separating the high-temperature powder from hot air flow by a separating cylinder,feeding micro-powder into a cylinder cooler through a pipeline, cooling high-temperature material blocks by primary air in the cylinder cooler, and collecting the material blocks at the kiln tail, finely grinding the collected material into fine powder being smaller than or equal to 0.044 mm or micro-powder being smaller than or equal to 0.010 mm. The calcined product has advantages of high activity, low production cost and the like and is used for replacing or partially replacing silica fume and alumina micro-powder for fire-resistant concrete, or admixtures of building concrete and cement, and accordingly, the purposes of fully using resources, reducing emissions, increasing income and saving expenses are achieved; the calcined product can also be used as raw materials or filler in industries including ceramic, paper making, rubber, coating, plastic, paint, cable, petrochemistry, medicine and the like.

Description

technical field [0001] The invention relates to a preparation method of calcined kaolin superfine powder, which is used to replace or partially replace silica fume and alumina micropowder for refractory concrete, or the admixture of building concrete and cement. Background technique [0002] my country is rich in kaolin resources, and calcined kaolin can be obtained by calcining kaolin. Calcined kaolin has the advantages of high whiteness, good crystal shape, small bulk density, large porosity, strong hiding power, etc. It is widely used in ceramics, papermaking, rubber, coatings, plastics, paints, cables, petrochemicals, pharmaceuticals and other industries as raw materials or filler. At present, the equipment used for calcining kaolin mainly includes fixed bed (downdraft kiln, tunnel kiln, pusher kiln and shuttle kiln) and semi-fixed bed (vertical kiln, rotary kiln) kiln. During the calcination process, the contact area between the material and the hot air flow is small,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/13C04B20/04C04B7/38
CPCC04B7/38C04B20/04C04B33/13C04B2235/3463C04B2235/96C04B14/106
Inventor 魏瀚王杰曾周严敦袁林胡建辉徐如林成洁
Owner RUITAI MATERIALS TECHNOLOGY CO LTD
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