Method for preparing ceramsite by using Xianfeng diatomite

A technology of diatomite and Pioneer, which is applied in the field of ceramsite prepared from Pioneer diatomite, can solve the problems of instability, high production cost, strict proportioning ratio, etc., and achieve improved compressive strength, accurate size and specification, and improved comprehensive performance. Effect

Inactive Publication Date: 2012-06-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it can only be sintered but not inflated, the output of the machine is unbalanced and unstable, the equipment occupies a large area, and the investment in infrastructure is large.
The main advantage of using the rotary kiln method is that it can be sintered or expanded. Using the same set of equipment, through different formulas and roasting systems, high-strength ceramsite, super-strong ceramsite or structural insulation ceramsite can be produced respectively; this is also sintering. The mechanical method and the vertical kiln method cannot do it; secondly, the rotary kiln can be set up in the open air, and the civil construction investment is obviously saved; the main disadvantage of the rotary kiln method is that when the fly ash is used as the raw material to produce ceramsite, the requirements for the chemical composition of the fly ash are relatively strict, Large amount of bonding flux (30%-70% for ultra-light type, 20%-30% for high-strength type), large heat consumption (1 times larger than that of sintering machine), many types of admixtures, strict ratio, stand-alone Small output, difficult roasting control, lack of experience, easy to produce agglomeration and ring formation in the kiln, and the production cost is higher than that of the sintering method (20% to 30%)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: The method for preparing ceramsite with Pioneer diatomite, the specific operations are as follows:

[0016] (1) The raw material comes from Xundian Pioneer mining area, which is medium and low-grade diatomite, and the upper layer contains 45.69% SiO 2 500g of diatomaceous earth and the middle layer contains 44.5% SiO 2 500g of diatomaceous earth is mixed in a ratio of 1:1;

[0017] (2) After the mixed diatomite is naturally air-dried, it is crushed until the particle size is between 0.2mm and 0.5mm, and then the diatomite and water are mixed and stirred evenly at a weight ratio of 100:60, and the mixture is air-dried to a moisture content When the water content is 40%, it is made into a spherical shape, and when the water content is 5%, it is placed in a muffle furnace for roasting. The roasting temperature is 1130 ° C. After roasting for 1 hour, it starts to cool down. , naturally cooled to room temperature, that is, high-strength diatomite ceramsite. ...

Embodiment 2

[0018] Embodiment 2: The method for preparing ceramsite with Pioneer diatomite, the specific operations are as follows:

[0019] (1) The raw material comes from medium and low-grade diatomite in Xundian Pioneer mining area, which will contain 44.5% SiO 2 500 grams of diatomaceous earth, containing 55.1% SiO 2 500 grams of diatomaceous earth and 250 grams of clay are mixed according to the ratio of 4:4:2, and the proportion of added clay is 20%;

[0020] (2) After the mixed diatomite is naturally air-dried, it is crushed until the particle size is between 0.2mm and 0.5mm, and then the diatomite and water are mixed and stirred evenly at a weight ratio of 100:70, and the mixture is air-dried to a moisture content When the water content is 50%, it is made into a spherical shape, dried in an oven at 105°C until the water content is 10%, and then roasted in a muffle furnace. After roasting at 1200°C for 0.5h, the temperature begins to drop, and the furnace temperature drops to 600 ...

Embodiment 3

[0021] Embodiment 3: The method for preparing ceramsite with Pioneer diatomite, the specific operations are as follows:

[0022] (1) The raw material comes from Xundian Pioneer mining area, which is medium and low-grade diatomite containing 55.1% SiO 2 500g of diatomite; (2) Air-dry the mixed diatomite naturally and then crush until the particle size is between 0.2mm and 0.5mm.

[0023] Mix diatomaceous earth and water at a ratio of 100:65 and stir evenly. When the mixture is air-dried to a water content of 45%, it is made into a spherical shape. When it is naturally air-dried to a water content of 8%, it is placed in a muffle furnace. Roasting, the calcination temperature is 1180°C, after 0.8h of calcination, the temperature starts to drop, when the furnace temperature drops to 550°C, it comes out of the furnace, and naturally cools to room temperature to obtain high-strength diatomite ceramsite. According to GB / T17431.2-1998 "Light Aggregate Test Method", the technical inde...

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PUM

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Abstract

The invention discloses a method for preparing ceramsite by using Xianfeng diatomite. The method comprises steps of: crushing a naturally dried raw material Xianfeng diatomite; mixing the raw material with water in a ratio of 100:60-70 and stirring uniformly; air-drying the mixture to a water content of 40-50%; moulding; air-drying naturally; and finally sintering to obtain high strength diatomite ceramsite. The method of the invention is simply operated, has good effect; and the ceramsite prepared by the method has good strength, reduced water absorption, strong durability and wide application scope.

Description

technical field [0001] The invention relates to a method for preparing ceramsite by using pioneer diatomite, which belongs to the technical field of building engineering materials. Background technique [0002] Diatomaceous earth is composed of the remains of diatoms, radiolarians or sponges with a high silicon oxide content. It is a biological sedimentary rock mainly composed of diatom remains (shells). SiO in diatoms 2 Not pure hydrous silica, but a unique type of silica containing other components closely associated with it, called diatom silica, SiO in diatomaceous earth 2 Usually 60% to 80%, the highest can reach more than 90%. Diatomite has the characteristics of light weight, good chemical stability, high porosity, sound insulation, wear resistance, acid resistance, heat resistance, strong adsorption, high melting point, etc. It has been widely used in various industrial sectors as filter aids, fillers, catalysts Carriers, abrasive reinforcements, animal feed supple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00
Inventor 张梅李毅刘自莲黄秋香
Owner KUNMING UNIV OF SCI & TECH
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