CN1146436A - Light haycite and preparation method - Google Patents

Abstract

The present invention relates to a light-type ceramsite made up by using overburden on the coal bed of opencut coal mine-surface soil as raw material and its preparation method. Said preparation method includes the following steps: A. breaking surface soil, homogenizing one and controlling its moisture; B. ofter having been pelletized in pelletizer the above-mentioned material is fed into rotary kiln, and its controlled kiln tail temp. is 120-250 deg.C, and its roasting temp. is 1020-1200 deg.C; and C. the roasted ceramsites are taken out from kiln, then fed into cooling machine and cooled, graded so as to obtain the light type ceramsites whose bulk specific gravity is 200-800 grade.

Description

Light ceramisite and preparation method

The present invention relates to the coverture on the open coal mine coal seam---table soil is light ceramisite and the preparation method of porcelain granule that raw material is manufactured.

It is the strip mining transformation colliery that the colliery can be protected by China, and the coverture on the coal seam is that Quaternary system loess, red soil floor are topsoil and N ₁ ⁸Mfs layer, during coal mining after peeling off as waste, long-term accumulation can not be used.

Chinese patent application CN1006060B (application number 86106748) discloses a kind of " Superlight ceramsites and compound method thereof ", its objective is that providing a kind of is raw material with the coal mining overburden, especially the overburden (mud stone and table soil) that can protect the colliery with China be the Superlight ceramsites and the effective compound method thereof of raw material production, this invention provides four independent prescriptions respectively as independent claim, one is: the block mud stone 10-90% break process that can protect in the overburden of colliery with China mixes with the native 10-90% of table, and humidifying is handled then; It two is: the mud stone fragmentation in colliery can be protected by China, sieve, mix diatomite or the flyash of 1-5%, humidifying is handled; It three is: the mud stone mixing of expansion character inequality in the overburden of colliery can be protected by China, and broken, sieve, obtain the powder mud stone, mix the diatomite of 1-5% and the sand of 1-10%, humidifying is handled; It four is: the block mud stone 10-80% that China can be protected in the colliery mixing with table native 10-80%, sand 1-10%, and humidifying was handled 3-5 days; Four above-mentioned prescriptions are made haydite through following technology: use the nodulizer balling-up, gave under temperature 350-450 ℃ hot 10-30 minute, at 1050-1150 ℃ roasting temperature 5-10 minute, promptly make loose volume weight 250-600kg/m ³Light ceramic.

The formulating of recipe of above-mentioned patent application is with mud stone (N ₁ ⁸Layer) serves as theme, all contain mud stone in four prescriptions that proposed, have only and contain table soil in two prescriptions.Because it is block that mud stone is, property is harder, is difficult to fragmentation, handle so must carry out humidifying, it is longer that humidifying is handled required time, and the broken homogenizing of mud stone is complicated and time consumption not only, and the pellet that contains mud stone easily produces the sticking kiln ring formation of more thickness melts when roasting, makes industrial production to carry out.The firing temperature of mud stone is comparatively narrow in addition, industrial extremely difficult control; The hot temperature of giving of pellet is 350-450 ℃, is much higher than the hot temperature of giving of the industry, and actually operating can't be carried out.Aforesaid all multifactor, make above-mentioned patent application be difficult in industrial production, use.

Purpose of the present invention is intended to overcome the deficiencies in the prior art, provides a kind of China that only adopts can protect the light ceramisite that the table soil in the overburden of coal seam, colliery is fired into and the preparation method of this light ceramisite.

Light ceramisite of the present invention system adopts China can protect table soil in the overburden of coal seam, colliery and fires and form.

As previously mentioned, it is the strip mining transformation colliery that the colliery can be protected by China, and the coverture on the coal seam is Quaternary system loess, red soil floor (i.e. table soil) and N ₁ ⁸Mfs layer also is to contain loess and laterite in the topsoil, and light ceramisite of the present invention can adopt 100% loess to fire and form, and also can adopt the loess of the laterite of 10-50% and 50-90% to fire and form.

The preparation method of light ceramisite of the present invention comprises following steps:

(1), will to show soil broken, homogenizing is handled, and controls wherein moisture, makes it be lower than 25%;

(2), after entering the nodulizer balling-up, enter rotary kiln, control kiln end temperature be 120-250 ℃, maturing temperature is 1020-1200 ℃, giving the heated drying time is 20-40 minute, firing time is 3-8 minute;

(3), behind the haydite kiln discharge after the roasting, enter in the cooler and lower the temperature, classified after, make loose volume weight and be 200 grades to 800 grades light ceramisite.

Light ceramisite cost of manufacture of the present invention is low, the waste of raw material for mining, help the comprehensive utilization of colliery resource, the prescription of light ceramisite is simple, only adopts table soil, make fragmentation in the technology, mixed processes and finish easily when adopting mud stone, save time-consuming humidifying treatment process, processing parameter is controlled easily, only need control kiln end temperature and maturing temperature, adopt this prescription and this technology that the yield rate of light ceramisite is improved greatly, thoroughly stopped the generation of sticking kiln accident.The present invention is owing to adopted the rational thermal regulation and the type of cooling, it is convenient to burn till control, the output height, avoided since the earth material ball to give hot temperature when advancing kiln too high, pellet breakage and surface map cracking occurs and reduce the pellet expansion character and problems such as haydite intensity even generation blast, and owing to adopted cooler to carry out slow cooling, having solved because haydite cools off the stress of generation fast causes the haydite pellet crackle breakage to occur, guarantee the quality and the uniformity of making pottery and expecting, had very strong industrial usability.

Embodiment:

1, the loess that can protect in the coal mining ore bed coverture topsoil with China is raw material, it is crushed to below the 3mm through twice roll crusher, entering biaxial rneader mixes, if moisture content is too high in the raw material loess, can add dry ground controls its moisture content and makes it be lower than 25%, enter balling-up in the nodulizer, enter in the rotary kiln again, control rotary kiln temperature is 140-160 ℃, maturing temperature 1040-1120 ℃, haydite is after entering rotary kiln, and temperature constantly raises in traveling process, is burnt bloated until the top temperature band, after burning the haydite kiln discharge after expanding, enter the slow cooling of layer-stepping cooler to 60-100 ℃,, make 200 grades respectively through the classification of unit weight method, 300 grades, 400 grades, 500 grades, 600 grades of (loose volume weight units/m ³) ultralight and light ceramisite.

2, loess and the laterite that can protect in the ore bed coverture topsoil of colliery with China is raw material, gets laterite 30%, loess 70%, through fragmentation, homogenizing is handled, and the control moisture content is lower than 25%, enter the nodulizer balling-up, enter in the rotary kiln, the control kiln end temperature is 220-240 ℃, maturing temperature 1080-1200 ℃, from haydite enter rotary kiln to the time that moves to clinkering zone be 20-40 minute, firing time is 3-8 minute, is burnt bloated haydite after slow cooling, and grading system gets the haydite of 200-800 level.

Claims (4)

1, a kind of light ceramisite is characterized in that adopting China can protect table soil in the overburden of coal seam, colliery and fires and form.

2,, it is characterized in that adopting 100% loess to fire and form according to the described light ceramisite of claim 1.

3,, it is characterized in that adopting the loess of the laterite of 10-50% and 50-90% to fire and form according to the described light ceramisite of claim 1.

4, a kind of preparation method of light ceramisite is characterized in that comprising following steps:

(1), will to show soil broken, homogenizing is handled, and controls wherein moisture, makes it be lower than 25%;

(2), after entering the nodulizer balling-up, enter rotary kiln, control kiln end temperature be 120-250 ℃, maturing temperature is 1020-1200 ℃, giving the heated drying time is 20-40 minute, firing time is 3-8 minute;

(3), behind the haydite kiln discharge after the roasting, enter in the cooler and lower the temperature, classified after, make loose volume weight and be 200 grades to 800 grades light ceramisite.