CN107663099A - A kind of high-strength ceramic granule containing contaminated soil and preparation method thereof - Google Patents
A kind of high-strength ceramic granule containing contaminated soil and preparation method thereof Download PDFInfo
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- CN107663099A CN107663099A CN201710826346.0A CN201710826346A CN107663099A CN 107663099 A CN107663099 A CN 107663099A CN 201710826346 A CN201710826346 A CN 201710826346A CN 107663099 A CN107663099 A CN 107663099A
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
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- C04B33/00—Clay-wares
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Abstract
The invention discloses a kind of high-strength ceramic granule containing contaminated soil and preparation method thereof.The primary raw material of use has flyash, contaminated soil and bentonite, and raw material mixes in proportion, through being granulated, drying, being calcined, cooling down contaminated soil high-strength ceramic granule is made.The present invention obtains high-strength ceramic granule using when geothermal Power Station accessory substance flyash and the production of industrial pollution soil, not only solve the problems, such as local fixed-end forces, obtain that physical strength is high, chemical stability is good, bulk density is small, specific surface area is big and can be used for building, the contaminated soil high-strength ceramic granule in the field such as water process and landscape art, and haydite production cost is reduced, there are good market prospects.
Description
Technical field
The invention belongs to field of inorganic nonmetallic material, and in particular to a kind of high-strength ceramic granule and its preparation containing contaminated soil
Method.
Background technology
Flyash is the most important accessory substance of steam power plant, and China is a country based on thermal power generation, thermal power generation
Substantial amounts of flyash can be discharged in flue, the reserves of flyash are considerable.And with the continuous development of China's power industry, powder
Coal ash discharge capacity is increasing year by year, and the disposal for flyash at present is still based on grey field stocking and storing, stocking and storing and land occupation contradiction
It is more and more prominent.Flyash has significant damage to natural resources such as soil, water resource, air resources, and human body can be made indirectly
Into injury.Flyash in industrial residue is used for the raw material for preparing haydite etc., realizes the secondary use to flyash, and can
To reduce production cost, meet the requirement of sustainable development, to resource recycle and the protection of ecological environment has greatly
Contribution.
Contaminated soil be because atmosphere pollution and water pollution and caused by soil contaminative waste residue, its endanger far be more than air
Pollution and water pollution.With the continuous quickening of process of industrialization, the unreasonable exploitation and its smelting of mineral resources are discharged, are long-term right
Soil carries out the reason such as administration of atmospheric sedimentation, chemical fertilizer and agricultural chemicals caused by sewage irrigation and sludge administration, human activity, causes
Soil pollution is serious.Soil environment situation totally allows of no optimist at present, and some areas soil pollution is heavier, arable soil environment
Quality causes anxiety, industry and mining discarded ground soil environment outstanding problem.Soil pollution is very harmful, gently then causes crop production reduction and agriculture
Product quality reduces, and heavy then polluted underground water and surface water, influences atmosphere quality, so as to directly be detrimental to health.But
The improvement of contaminated soil is extremely difficult, therefore rational utilization contaminated soil carries out digestion process as the raw material of industry, makes its money
Source is the new way for solving the problems, such as contaminated soil, but the technology of current this respect is less.
Haydite is using inorganic material as primary raw material one through technique productions such as pretreatment of raw material, granulation, roasting, coolings
Kind light-weight aggregate, haydite outer surface have the hard glaze layer shell of waterproof, and inside has closed microcellular structure.According to the work(of haydite
The different haydites of energy can be used as construction material as light-weight aggregate；It is used as water treatment filter material in water treatment field；It is used as in Landscape Industry
The matrix of soilless culture.Mainly have in the market using clay, shale as raw material clay haydite and haydites of book structure, with glutinous
The limitation of the resources such as soil, shale utilizes, and the high energy consumption of haydite production, haydite cost remain high in addition.
The content of the invention
The defects of in order to overcome in the prior art, this application provides a kind of high-strength ceramic granule containing contaminated soil and its preparation
Method, mainly using flyash, contaminated soil and bentonite as raw material, the processing approach of industrial by-products is opened up, reduce haydite life
Cost is produced, and improves ceramic product quality.
The contaminated soil high-strength ceramic granule that the present invention produces, profile are regular spherical or elliposoidal, and there are Small Holes on surface.Production
Product density rating 500-900, cylindrical compress strength is in 5MPa-12MPa, water absorption rate 2%-14%, chloride content be 2.1-12.5 ㎎/
㎏, meet national standard.
To achieve these goals, the technological means that the application takes is as follows：
A kind of high-strength ceramic granule containing contaminated soil, by weight, its raw material proportioning is as follows：Flyash 60-80 parts, pollution
Soil (moisture content≤2%)：10-30 parts, 10 parts of bentonite；
Described flyash is the three-level flyash arranged outside steam power plant's coal-powder boiler, and the oxide composition of flyash is SiO2、
Al2O3And a small amount of FeO, Fe2O3、CaO、MgO、SO3、TiO2Deng.Wherein SiO2And Al2O3Content can account for the 60% of total content with
On.It is sial element supplier main in haydite production, the haydite for making to burn till possesses preferable physical property.Make in the present invention
With the proportioning of flyash in 60-90 parts, flyash is higher than this scope, and sintering temperature requires high, energy consumption increase, and product is calcined
Degree is unstable, there is the inhomogenous phenomenon of half-cooked or surface color；Flyash addition is less than this scope, and product cylindrical compress strength is inclined
It is low, occur softening transform in product roasting process, bonding phenomenon increases between pellet, is unfavorable for production run, product qualification rate
Decline.
Described contaminated soil for industry (such as：Smelting iron and steel, petrochemical industry, papermaking and textile industry etc.) pollution production
Raw contaminated soil, main mineral constituent are quartz, feldspar, mica, hornblend, pyroxene and Al2O3、Fe2O3Deng partial alkaline thing
The heavy metal element such as matter and a small amount of Cd, Hg, As, Pb, Al2O3、Fe2O3It is the main matter for forming ceramic product；In ceramsite sintering
During Fe2O3With carbon generated reactive gas, while ensureing that haydite has preferable physical strength, haydite density is diminished, be incubated
Effect improves, and alkaline matter can play fluxing during baking ceramsite, reduce the effect of fusing point.
Bentonite is the nonmetallic minerals using montmorillonite as main mineral constituent, and smectite structure is by two silica four sides
Body presss from both sides the 2 of one layer of alumina octahedral composition：1 type crystal structure, because the layer structure that montmorillonite structure cell is formed has some sun
Ion, such as Cu, Mg, Na, K, and the effect of these cations and montmorillonite structure cell is very unstable, is easily handed over by other cations
Change, therefore there is preferable ion exchangeable.Wherein smectite content is by montmorillonite in 85-90%, bentonitic properties
Determined.Can into compact massive, or loose earthy, have when being rubbed with the hands and ground with finger sliding sense, small blocks add water after volume it is swollen
Big several times are in suspension in water, when water is few in the pasty state to 20-30 times.
A kind of preparation method of described high-strength ceramic granule containing contaminated soil, is comprised the following steps that：
1) pretreatment of raw material：
Flyash, directly by thermoelectricity flyash warehouse by Geldart-D particle to the small-sized flyash warehouse in scene；
Contaminated soil, prebake is carried out using residual heat from kiln furnace, after contaminated soil water content≤2%, into dry ball
Grinding is carried out, the contaminated soil that fineness is 200 mesh is obtained through screening after grinding, stores standby to contaminated soil warehouse；
Bentonite, bought, stored standby to bentonite warehouse by outside.
2) metering stirring：
Flyash, contaminated soil and bentonite are weighed respectively according to metering, and are placed in mixer；Raw material, which enters, to be stirred
After mixing machine, start timing, after stirring 90s-150s, the raw material mixed is drawn off, by Belt Conveying to nodulizer；
3) it is granulated balling-up：
Compound is sent into nodulizer through belt, and external adding water sprays into nodulizer after atomization, and the dosage for controlling water is material
The 15-25% of gross weight, charging rate is controlled by adjusting belt, life is adjusted by adjusting angle of inclination and the rotating speed of nodulizer
The particle diameter of pellet, raw material ball reach automatic spilling nodulizer after particle diameter 5mm-20mm, carry out 125 DEG C of low temperature by belt drying belt and dry
Dry 1h or so, until moisture content is down to less than 2%.
4) high-temperature roasting：
Raw material ball after drying is sent into kiln by belt again and is calcined, and kiln sets roasting system by controller：Heating
Speed, thermostat temperature, constant temperature time, cooling rate, the haydite after the completion of roasting is subjected to quickly cooling, screening is got product；
Roasting system is specially：Pellet is set to rise to low 250-350 DEG C of thermostat temperature by drying temperature with 10 DEG C/min speed, in low perseverance
Warm area constant temperature 15-30min；Pellet is set to rise to middle 520-700 DEG C of thermostat temperature with 10 DEG C/min speed, in middle flat-temperature zone constant temperature
15-30min；Pellet is set to rise to high 1160-1200 DEG C of thermostat temperature with 8 DEG C/min, in high-temperature constant warm area constant temperature 20-30min；With
5 DEG C/min speed makes temperature drop to less than 500 DEG C, and now high-temperature roasting technique is completed.
Present invention utilizes two kinds of solid waste of flyash and contaminated soil to be made haydite, is combined in inventive formulation
Under, through high-temperature roasting, heavy metal ion that flyash and bentonite can be effectively in fixed-contamination soil effectively reduces haydite and existed
Heavy ion leaching content in water.It is innoxious to realize solid waste, avoids secondary pollution, reduces the wasting of resources, and product matter
Amount is stable, and indices meet national standard.With other pure clay class haydite similar natures, it can be used as construction material, sewage
Processing and afforestation etc..Furthermore with both solid waste baking ceramsites, other natural resources are fired with traditional utilization
Haydite is compared, and greatlys save purchase cost and cost of transportation, has good market prospects.
Embodiment
The embodiment of form by the following examples, the above of the present invention is done further specifically
It is bright, but the scope that this should not be interpreted as to the above-mentioned theme of the present invention is only limitted to following example.It is all to be based on the above of the present invention
The technology realized belongs to the scope of the present invention, unless otherwise specified, complete using conventional prior in following embodiments
Into.
Embodiment 1
A kind of high-strength ceramic granule containing contaminated soil, its raw material are flyash, contaminated soil and bentonite.In parts by weight,
Its raw material proportioning is：60 parts of flyash, 30 parts of contaminated soil, 10 parts of bentonite.
The preparation method of the high-strength ceramic granule comprises the following steps that：
Pretreatment of raw material：Flyash, directly stored up by thermoelectricity flyash warehouse by Geldart-D particle to the small-sized flyash in scene
Storehouse；Contaminated soil, for draining institute contaminated soil outside paper mill, main component be quartz, feldspar, mica, hornblend, pyroxene and
Al2O3、Fe2O3Deng the heavy metal element such as partial alkaline material and chromium, cadmium, barium, manganese, nickel, lead, mercury, and due to numerous metallic elements
Presence, can reduce firing temperature, save the energy, prebake is carried out using residual heat from kiln furnace, after contaminated soil water content≤2%,
Into dry ball progress grinding, the contaminated soil that fineness is 200 mesh is obtained through screening after grinding, stores to contaminated soil and stores up
Storehouse is standby；Bentonite, bought, stored standby to bentonite warehouse by outside.
Metering stirring：Flyash, contaminated soil and bentonite are weighed respectively according to metering, and are placed on mixer；It is former
After material enters mixer, start timing, after stirring 120s, the raw material mixed is drawn off, by Belt Conveying to nodulizer；
It is granulated balling-up：Compound is sent into nodulizer through belt, and external adding water sprays into nodulizer after atomization, controls the use of water
Amount is the 15% of material gross weight, by adjust belt control charging rate, by adjust angle of inclination and the rotating speed of nodulizer come
The particle diameter of raw material ball is adjusted, raw material ball reaches automatic spilling nodulizer after 10 ± 2mm of particle diameter, 125 DEG C are carried out by belt drying belt
Low temperature drying 1h or so, until moisture content is down to less than 2%；
High-temperature roasting：Raw material ball after drying is sent into kiln by belt again and is calcined, and kiln is set by controller and is calcined
System：Programming rate, thermostat temperature, constant temperature time, cooling rate, the haydite after the completion of roasting quickly cool down, sieved
Get product.Roasting system is specially：Pellet is set to rise to low 260 DEG C of thermostat temperature by drying temperature with 10 DEG C/min speed,
In low flat-temperature zone constant temperature 15min；Pellet is set to rise to middle 520 DEG C of thermostat temperature with 10 DEG C/min speed, in middle flat-temperature zone constant temperature
20min；Pellet is set to rise to high 1160 DEG C of thermostat temperature with 8 DEG C/min, in high-temperature constant warm area constant temperature 20min；With 5 DEG C/min speed
Degree makes temperature drop to less than 500 DEG C, and now high-temperature roasting technique is completed.
The contaminated soil high-strength ceramic granule obtained by above method, its bulk density are 464kg/m3, density rating 500
Level, cylindrical compress strength 6.7MPa, water absorption rate 8.1%, chloride content 12.4mg/kg.
The haydite water absorption rate that the method obtains is of a relatively high, can be used as sewage disposal and afforestation etc..
Embodiment 2
A kind of high-strength ceramic granule containing contaminated soil, its raw material are flyash, contaminated soil and bentonite.In parts by weight,
Its raw material proportioning is：65 parts of flyash, 25 parts, 10 parts of bentonite.
The preparation method of the high-strength ceramic granule comprises the following steps that：
Pretreatment of raw material：Flyash, directly stored up by thermoelectricity flyash warehouse by Geldart-D particle to the small-sized flyash in scene
Storehouse；Contaminated soil, for draining institute contaminated soil outside paper mill, main component be quartz, feldspar, mica, hornblend, pyroxene and
Al2O3、Fe2O3Deng the heavy metal element such as partial alkaline material and chromium, cadmium, barium, manganese, nickel, lead, mercury, binding agent can be not only made,
And due to the presence of numerous metallic elements, firing temperature can be reduced, saves the energy, prebake, pollution are carried out using residual heat from kiln furnace
After soil moisture content≤2%, into dry ball progress grinding, the Polluted Soil that fineness is 200 mesh is obtained through screening after grinding
Earth, store standby to contaminated soil warehouse；Bentonite, bought, stored standby to bentonite warehouse by outside.
Metering stirring：Flyash, contaminated soil and bentonite are weighed respectively according to metering, and are placed on mixer；It is former
After material enters mixer, start timing, after stirring 120s, the raw material mixed is drawn off, by Belt Conveying to nodulizer；
It is granulated balling-up：Compound is sent into nodulizer through belt, and external adding water sprays into nodulizer after atomization, controls the use of water
Amount is the 20% of material gross weight, by adjust belt control charging rate, by adjust angle of inclination and the rotating speed of nodulizer come
The particle diameter of raw material ball is adjusted, raw material ball reaches automatic spilling nodulizer after 10 ± 2mm of particle diameter, 125 DEG C are carried out by belt drying belt
Low temperature drying 1h or so, until moisture content is down to less than 2%；
High-temperature roasting：Raw material ball after drying is sent into kiln by belt again and is calcined, and kiln is set by controller and is calcined
System：Programming rate, thermostat temperature, constant temperature time, cooling rate, the haydite after the completion of roasting quickly cool down, sieved
Get product.Roasting system is specially：Pellet is set to rise to low 280 DEG C of thermostat temperature by drying temperature with 10 DEG C/min speed,
In low flat-temperature zone constant temperature 18min；Pellet is set to rise to middle 550 DEG C of thermostat temperature with 10 DEG C/min speed, in middle flat-temperature zone constant temperature
20min；Pellet is set to rise to high 1160 DEG C of thermostat temperature with 8 DEG C/min, in high-temperature constant warm area constant temperature 25min；With 5 DEG C/min speed
Degree makes temperature drop to less than 500 DEG C, and now high-temperature roasting technique is completed.
The contaminated soil high-strength ceramic granule obtained by above method, its bulk density are 553kg/m3, density rating 600
Level, cylindrical compress strength 8.4MPa, water absorption rate 7.6%, chloride content 10.2mg/kg.
The haydite water absorption rate that the method obtains is of a relatively high, can be used as sewage disposal and afforestation etc..
Embodiment 3
A kind of high-strength ceramic granule containing contaminated soil, its raw material are flyash, contaminated soil and bentonite.In parts by weight,
Its raw material proportioning is：70 parts of flyash, 20 parts of contaminated soil, 10 parts of bentonite.
The preparation method of the high-strength ceramic granule comprises the following steps that：
Pretreatment of raw material：Flyash, directly stored up by thermoelectricity flyash warehouse by Geldart-D particle to the small-sized flyash in scene
Storehouse；Contaminated soil, pile up the contaminated soil on ground, main component Al for the slag of smelting iron and steel factory2O3、Fe2O3Deng partial alkaline
The heavy metal element such as oxide and chromium, cadmium, barium, manganese, nickel, lead, mercury, binding agent can be not only made, and due to numerous metallic elements
Presence, can reduce firing temperature, save the energy, prebake is carried out using residual heat from kiln furnace, after contaminated soil water content≤2%,
Into dry ball progress grinding, the contaminated soil that fineness is 200 mesh is obtained through screening after grinding, stores to contaminated soil and stores up
Storehouse is standby；Bentonite, bought, stored standby to bentonite warehouse by outside.
Metering stirring：Flyash, contaminated soil and bentonite are weighed respectively according to metering, and are placed on mixer；It is former
After material enters mixer, start timing, after stirring 120s, the raw material mixed is drawn off, by Belt Conveying to nodulizer；
It is granulated balling-up：Compound is sent into nodulizer through belt, and external adding water sprays into nodulizer after atomization, controls the use of water
Amount is the 20% of material gross weight, by adjust belt control charging rate, by adjust angle of inclination and the rotating speed of nodulizer come
The particle diameter of raw material ball is adjusted, raw material ball reaches automatic spilling nodulizer after 8 ± 2mm of particle diameter, low by 125 DEG C of belt drying belt progress
Temperature drying 1h or so, until moisture content is down to less than 2%；
High-temperature roasting：Raw material ball after drying is sent into kiln by belt again and is calcined, and kiln is set by controller and is calcined
System：Programming rate, thermostat temperature, constant temperature time, cooling rate, the haydite after the completion of roasting quickly cool down, sieved
Get product.Roasting system is specially：Pellet is set to rise to low 300 DEG C of thermostat temperature by drying temperature with 10 DEG C/min speed,
In low flat-temperature zone constant temperature 25min；Pellet is set to rise to middle 600 DEG C of thermostat temperature with 10 DEG C/min speed, in middle flat-temperature zone constant temperature
25min；Pellet is set to rise to high 1180 DEG C of thermostat temperature with 8 DEG C/min, in high-temperature constant warm area constant temperature 25min；With 5 DEG C/min speed
Degree makes temperature drop to less than 500 DEG C, and now high-temperature roasting technique is completed.
The contaminated soil high-strength ceramic granule obtained by above method, its bulk density are 743kg/m3, density rating 800
Level, cylindrical compress strength 9.1MPa, water absorption rate 3.9%, chloride content 4.1mg/kg.
The haydite intensity that the method obtains is of a relatively high, available in terms of the construction materials such as concrete.
Embodiment 4
A kind of high-strength ceramic granule containing contaminated soil, its raw material are flyash, contaminated soil and bentonite.In parts by weight,
Its raw material proportioning is：80 parts of flyash, 10 parts of contaminated soil, 10 parts of bentonite.
The preparation method of the high-strength ceramic granule comprises the following steps that：
Pretreatment of raw material：Flyash, directly stored up by thermoelectricity flyash warehouse by Geldart-D particle to the small-sized flyash in scene
Storehouse；Contaminated soil, pile up the contaminated soil on ground, main component Al for the slag of smelting iron and steel factory2O3、Fe2O3Deng partial alkaline
The heavy metal element such as oxide and chromium, cadmium, barium, manganese, nickel, lead, mercury, binding agent can be not only made, and due to numerous metallic elements
Presence, can reduce firing temperature, save the energy, prebake is carried out using residual heat from kiln furnace, after contaminated soil water content≤2%,
Into dry ball progress grinding, the contaminated soil that fineness is 200 mesh is obtained through screening after grinding, stores to contaminated soil and stores up
Storehouse is standby；Bentonite, bought, stored standby to bentonite warehouse by outside.
Metering stirring：Flyash, contaminated soil and bentonite are weighed respectively according to metering, and are placed on mixer；It is former
After material enters mixer, start timing, after stirring 150s, the raw material mixed is drawn off, by Belt Conveying to nodulizer；
It is granulated balling-up：Compound is sent into nodulizer through belt, and external adding water sprays into nodulizer after atomization, controls the use of water
Amount is the 25% of material gross weight, by adjust belt control charging rate, by adjust angle of inclination and the rotating speed of nodulizer come
The particle diameter of raw material ball is adjusted, raw material ball reaches automatic spilling nodulizer after 8 ± 2mm of particle diameter, low by 125 DEG C of belt drying belt progress
Temperature drying 1h or so, until moisture content is down to less than 2%；
High-temperature roasting：Raw material ball after drying is sent into kiln by belt again and is calcined, and kiln is set by controller and is calcined
System：Programming rate, thermostat temperature, constant temperature time, cooling rate, the haydite after the completion of roasting quickly cool down, sieved
Get product.Roasting system is specially：Pellet is set to rise to low 350 DEG C of thermostat temperature by drying temperature with 10 DEG C/min speed,
In low flat-temperature zone constant temperature 30min；Pellet is set to rise to middle 700 DEG C of thermostat temperature with 10 DEG C/min speed, in middle flat-temperature zone constant temperature
30min；Pellet is set to rise to high 1200 DEG C of thermostat temperature with 8 DEG C/min, in high-temperature constant warm area constant temperature 30min；With 5 DEG C/min speed
Degree makes temperature drop to less than 500 DEG C, and now high-temperature roasting technique is completed.
The contaminated soil high-strength ceramic granule obtained by above method, its bulk density are 892kg/m3, density rating 900
Level, cylindrical compress strength 9.7MPa, water absorption rate 2.7%, chloride content 2.6mg/kg.
The haydite intensity that the method obtains is of a relatively high, available in terms of the construction materials such as concrete.
Claims (4)
- A kind of 1. high-strength ceramic granule containing contaminated soil, it is characterised in that：By weight, its raw material proportioning is as follows：Flyash 60-80 parts, contaminated soil：10-30 parts, 10 parts of bentonite；Wherein, Contaminated soil moisture content≤2%；The high-strength ceramic granule product density grade is 500-900, and cylindrical compress strength is in 5MPa-12MPa, water absorption rate 2%-14%, chlorination Thing content is 2.1-12.5 ㎎/㎏.
- A kind of 2. high-strength ceramic granule containing contaminated soil according to claim 1, it is characterised in that：Described flyash is the three-level flyash arranged outside steam power plant's coal-powder boiler；Described contaminated soil is contaminated soil caused by industrial pollution.
- A kind of 3. preparation method of the high-strength ceramic granule containing contaminated soil as claimed in claim 1, it is characterised in that specific steps For：1) pretreatment of raw material：Flyash, directly by thermoelectricity flyash warehouse by Geldart-D particle to the small-sized flyash warehouse in scene；Contaminated soil, prebake is carried out using residual heat from kiln furnace, after contaminated soil water content≤2%, carried out into dry ball Grinding, the contaminated soil that fineness is 200 mesh is obtained through screening after grinding, is stored standby to contaminated soil warehouse；Bentonite, bought, stored standby to bentonite warehouse by outside；2) metering stirring：Flyash, contaminated soil and bentonite are weighed respectively according to metering, and are placed in mixer；Raw material enters mixer Afterwards, start timing, after stirring 90s-150s, the raw material mixed is drawn off, by Belt Conveying to nodulizer；3) it is granulated balling-up：Compound is sent into nodulizer through belt, and external adding water sprays into nodulizer after atomization, and the dosage for controlling water is material gross weight 15-25%, by adjust belt control charging rate, adjust raw material ball by adjusting angle of inclination and the rotating speed of nodulizer Particle diameter, raw material ball reaches automatic after particle diameter 5mm-20mm and overflows nodulizer, and 125 DEG C of low temperature dryings are carried out by belt drying belt, Until moisture content is down to less than 2%；4) high-temperature roasting：Raw material ball after drying is sent into kiln by belt again and is calcined, and kiln sets roasting system by controller：Programming rate, Thermostat temperature, constant temperature time, cooling rate, the haydite after the completion of roasting is subjected to quickly cooling, screening is got product.
- A kind of 4. preparation method of high-strength ceramic granule containing contaminated soil according to claim 3, it is characterised in that step 4) Described roasting system is specially：Pellet is set to rise to low 250-350 DEG C of thermostat temperature by drying temperature with 10 DEG C/min speed, In low flat-temperature zone constant temperature 15-30min；Pellet is set to rise to middle 520-700 DEG C of thermostat temperature with 10 DEG C/min speed, in middle constant temperature Area constant temperature 15-30min；Pellet is set to rise to high 1160-1200 DEG C of thermostat temperature with 8 DEG C/min, in high-temperature constant warm area constant temperature 20- 30min；Temperature is set to drop to less than 500 DEG C with 5 DEG C/min speed, now high-temperature roasting technique is completed.
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| CN112441826A (en) * | 2020-11-27 | 2021-03-05 | 华新水泥股份有限公司 | Ultra-light ceramsite and preparation method thereof |
| CN113999036A (en) * | 2021-07-20 | 2022-02-01 | 苏州市宏宇环境科技股份有限公司 | Expanded ceramsite containing polluted soil and printing and dyeing sludge and preparation method thereof |
| CN114538892A (en) * | 2022-03-25 | 2022-05-27 | 浙江寰龙环境科技有限公司 | Low-cost ceramsite preparation process based on harmless treatment of polluted soil |
| CN115196989A (en) * | 2022-07-21 | 2022-10-18 | 苏州市宏宇环境科技股份有限公司 | Soil and sludge mixed aging pottery making process |
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