CN111548111A - Baking-free ceramsite and preparation method thereof - Google Patents
Baking-free ceramsite and preparation method thereof Download PDFInfo
- Publication number
- CN111548111A CN111548111A CN202010408662.8A CN202010408662A CN111548111A CN 111548111 A CN111548111 A CN 111548111A CN 202010408662 A CN202010408662 A CN 202010408662A CN 111548111 A CN111548111 A CN 111548111A
- Authority
- CN
- China
- Prior art keywords
- parts
- ceramsite
- less
- baking
- filtrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of building materials, and particularly relates to a non-fired ceramsite and a preparation method thereof. The invention aims to provide a non-sintered ceramsite and a preparation method thereof, wherein the non-sintered ceramsite comprises the following components in parts by weight: 10-50 parts of sludge ash, 50-100 parts of coal gangue, 25-75 parts of industrial byproduct gypsum, 10-50 parts of gasified slag, 40-90 parts of plasticizer and 5-25 parts of adsorbent. Compared with the prior art, the method has the following advantages: 1. the raw material proportion of the invention takes the full solid waste as the raw material to prepare the ceramsite, thereby improving the comprehensive utilization rate of the solid waste; 2. the baking-free ceramsite has short curing time and considerable strength, and the time cost for preparing the ceramsite is reduced; 3. the heavy metals in the sludge ash are effectively adsorbed and solidified.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a non-fired ceramsite and a preparation method thereof.
Background
With the continuous acceleration of urbanization and the continuous acceleration of municipal sludge yield, the estimated 2020 sludge yield of China reaches 7146.66 ten thousand tons, most of the current sludge disposal methods bring secondary pollution, sludge ash is the product of sludge after incineration, the current disposal methods mainly adopt sanitary landfill and have higher disposal cost, and in addition, the potential hazard of the disposal methods is that the sludge ash has heavy metal pollution.
The coal gangue is solid waste discharged in the coal mining process and the coal washing process, according to statistics, the output of the coal gangue in China in 2017 reaches 3.3 hundred million tons, and the comprehensive utilization rate is 53.1 percent, while the comprehensive utilization rate of the coal gangue in Japan and some European countries can reach more than 90 percent, and a large space is provided for improving the comprehensive utilization rate of the coal gangue.
One of the main materials of concrete is gravel aggregate, and generally, the cost of infrastructure construction engineering materials accounts for 60% -70% of the construction cost, wherein the gravel aggregate accounts for nearly one third. In recent years, under the guidance of national ecological civilization construction guidelines, the transformation upgrading and the leap-type development of the sandstone aggregate industry continuously close traditional and small enterprises in various places, and eliminate the backward capacity. Based on this, the status quo of insufficient supply of sandstone aggregate often appears in China, and the cost is also rising continuously.
Ceramsite is artificial lightweight aggregate, and generally undergoes chemical reaction under certain conditions to form a stable and hard solid phase. The artificial ceramsite has many excellent properties, such as low density, good freezing resistance, good softening coefficient and the like. The ceramsite has designability, and can be designed into ceramsite with different densities, different strengths and water absorption, for example, the ceramsite designability is utilized to prepare a base material for concrete, and the ceramsite can replace part of natural sandstone aggregates.
Based on the above, an effective way for treating sludge ash and slag into resources by using the ceramsite based on sludge ash and other solid wastes is developed, the ceramsite containing sludge ash and slag, which is prepared at present, is mainly sintered, the investment on sintered ceramsite equipment is large, and the cost is high; most of the baking-free ceramsite has low strength and limited application range, and in addition, the adsorption and solidification effects of heavy metals contained in the sludge ash baking-free ceramsite on the heavy metals are not considered too much when the sludge ash baking-free ceramsite is prepared into the ceramsite.
Disclosure of Invention
The invention aims to provide a non-sintered ceramsite and a preparation method thereof.
The technical scheme provided by the invention for solving the technical problems is as follows: the baking-free ceramsite comprises the following components in parts by weight: 10-50 parts of sludge ash, 50-100 parts of coal gangue, 25-75 parts of industrial byproduct gypsum, 10-50 parts of gasified slag, 5-25 parts of adsorbent and 30-85 parts of plasticizer.
The further technical scheme is that the sludge ash is one or two of byproducts of municipal and industrial sludge after combustion, and the content of silicon oxide and the content of aluminum oxide in the sludge ash are not less than 30% and not less than 18%.
The further technical scheme is that the content of silicon oxide in the coal gangue is not less than 15%, the content of aluminum oxide is not less than 3%, and the content of calcium oxide is not less than 50%.
The further technical scheme is that the content of calcium sulfate hemihydrate in the industrial byproduct gypsum is not less than 75%, the content of calcium sulfate dihydrate is less than 10%, and the content of free water is less than 5%.
The coal gasification slag further comprises the following technical scheme that the content of calcium oxide in the coal gasification slag is not less than 40%, the content of silicon oxide is not less than 30%, and the content of aluminum oxide is not less than 15%.
The further technical scheme is that the adsorbent comprises the following components in parts by weight: 5-20 parts of zeolite powder, 10-30 parts of chitosan, 1-10 parts of activated carbon and 5-20 parts of diatomite.
The further technical scheme is that the plasticizer comprises the following components in parts by weight: 20-40 parts of polycarboxylic acid water reducing agent, 10-30 parts of shrinkage reducing agent, 1-10 parts of retarder and 120-270 parts of deionized water.
The plasticizer can reduce the interfacial tension between solid particles, so that the inside of the ceramsite is compact, and the performance of the ceramsite is changed; the plasticizer has the function of relieving hydration of rubber materials such as coal gangue and the like, so that better granulation and molding are facilitated.
A preparation method of baking-free ceramsite comprises the following steps:
a. preparing an adsorbent: 5-20 parts of zeolite powder, 10-30 parts of chitosan, 1-10 parts of activated carbon and 5-20 parts of diatomite.
b. Preparing materials: weighing 10-50 parts of sludge ash, 50-100 parts of coal gangue, 25-75 parts of industrial byproduct gypsum, 10-50 parts of gasified slag and 5-20 parts of adsorbent;
c. calcining and pretreating coal gangue: calcining the prepared coal gangue at 500-900 ℃ for 1-5 hours;
d. preparing a plasticizer solution: preparing 20-40 parts of polycarboxylic acid water reducing agent, 10-30 parts of shrinkage reducing agent, 1-10 parts of retarder and 120-270 parts of deionized water into a solution, wherein the surface tension of the solution is less than 35mN/m, and the water reduction rate is more than 20%;
e. adjusting the pH value: b, respectively grinding and uniformly mixing the sludge ash, coal gangue, industrial byproduct gypsum, gasified slag and adsorbent weighed in the step a, adding 40-90 parts of plasticizer solution and pH regulator, stirring uniformly, blocking and press-filtering to obtain filtrate and mixed blocks, and measuring the pH value of the filtrate;
if the pH value of the filtrate is less than 11, uniformly mixing the filtrate and the mixed block again, then continuously adding a pH regulator, stirring uniformly, blocking and filter-pressing to obtain the filtrate and the mixed block, measuring the pH value of the filtrate again until the pH value of the filtrate is not less than 11, and then carrying out the next step;
f. and (3) granulation: d, grinding and sieving the mixed blocks determined in the step d, putting the ground mixed blocks into granulation equipment, uniformly mixing, and spraying the filtrate obtained in the step d into the granulation equipment to form a granular product which is a ceramsite raw material;
g. and (5) maintenance: and placing the prepared ceramsite raw material into a curing chamber for curing, then placing the cured ceramsite raw material into steam curing equipment for curing, and taking out the cured ceramsite raw material to obtain the ceramsite.
The further technical scheme is that the temperature in the curing chamber is 20 +/-2 ℃, the relative humidity is not less than 95%, and the curing time is 2-10 hours; the temperature in the steam curing equipment is 50-90 ℃, and the curing time is 4-10 hours.
The further technical proposal is that the pH regulator is one of sodium hydroxide, potassium hydroxide and calcium hydroxide.
The invention takes the modulated plasticizer as the ceramsite binder, can effectively reduce the interfacial tension of dry materials, enables the internal structure of the ceramsite to be more compact, and can play a role in lubricating in the granulation process, reduce the use amount of the ceramsite and increase the strength of the ceramsite.
Compared with the prior art, the method has the following advantages:
1. the raw material proportion of the invention takes the full solid waste as the raw material to prepare the ceramsite, and the comprehensive utilization rate of the solid waste is improved;
2. the sludge contains heavy metal elements, and the heavy metal adsorbent is added in the ceramsite proportioning, so that leaching of heavy metals in the ceramsite can be effectively solidified.
3. Because the pH value of the sludge ash can influence the hydration reaction of the rubber material, and further influence various performances of the ceramsite, the pH regulator is utilized to accurately regulate the proportioning pH value of the ceramsite so as to avoid the influence of insufficient alkalinity in the preparation of the ceramsite on hydration products of raw materials and adverse influence on the performances of the ceramsite;
4. the baking-free ceramsite disclosed by the invention is short in curing time, considerable in strength and short in curing time, and the time cost for preparing the ceramsite is reduced.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
A baking-free ceramsite is prepared by the following steps:
(1) preparing an adsorbent: uniformly mixing 10 parts of zeolite powder, 10 parts of chitosan, 2 parts of active carbon and 5 parts of diatomite according to a ratio;
(2) preparing materials: weighing 10 parts of sludge ash, 100 parts of coal gangue, 45 parts of industrial byproduct gypsum, 30 parts of gasified coal slag and 5 parts of adsorbent;
(3) calcining and pretreating coal gangue: calcining the prepared coal gangue for 1 hour at the temperature of 800 ℃;
(4) preparing a plasticizer solution: preparing 25 parts of polycarboxylic acid water reducing agent, 20 parts of shrinkage reducing agent, 5 parts of retarder and 250 parts of deionized water into a solution;
(5) adjusting the pH value: respectively grinding the components in the step (1), uniformly mixing, adding 50 parts of plasticizer solution and 18 parts of sodium hydroxide, uniformly stirring, blocking, and performing pressure filtration to obtain filtrate and mixed blocks, and measuring the pH value of the filtrate to be 11.3;
(6) and (3) granulation: grinding and sieving the mixed blocks, putting the ground and sieved mixed blocks into granulation equipment, uniformly mixing the mixed blocks at the rotating speed of 35 revolutions per minute, and then spraying the filtrate into the granulation equipment, wherein the rotating speed is adjusted to be 50 revolutions per minute, and the formed granular product is ceramsite raw material;
(7) and (5) maintenance: and (3) placing the prepared ceramsite raw material in a curing room with the temperature of 20 +/-5 ℃ and the relative humidity of not less than 95%, curing for 2h, then placing the ceramsite raw material in steam curing equipment with the temperature of 80 ℃ for curing for 7h, and taking out the ceramsite raw material to obtain the ceramsite.
Example 2
A baking-free ceramsite is prepared by the following steps:
(1) 10 parts of stone powder, 10 parts of chitosan, 5 parts of active carbon and 10 parts of diatomite are uniformly mixed according to the proportion;
(2) preparing materials: weighing 20 parts of sludge ash, 90 parts of coal gangue, 55 parts of industrial byproduct gypsum, 20 parts of gasified coal slag and 10 parts of adsorbent;
(3) calcining and pretreating coal gangue: calcining the prepared coal gangue for 2 hours at the temperature of 700 ℃;
(4) preparing a plasticizer solution: preparing 30 parts of polycarboxylic acid water reducing agent, 18 parts of shrinkage reducing agent, 6 parts of retarder and 216 parts of deionized water into a solution;
(5) adjusting the pH value: grinding all the components, sieving with a 400-mesh sieve, uniformly mixing, adding 57 parts of plasticizer solution and 28 parts of potassium hydroxide, uniformly stirring, blocking, and performing pressure filtration to obtain filtrate and mixed blocks, and measuring the pH value of the filtrate to be 12;
(6) and (3) granulation: grinding and sieving the mixed blocks, putting the ground and sieved mixed blocks into granulation equipment, uniformly mixing the mixed blocks at the rotating speed of 30 revolutions per minute, and then spraying the filtrate into the granulation equipment, wherein the rotating speed is adjusted to be 60 revolutions per minute, and the formed granular product is ceramsite raw material;
(7) and (5) maintenance: and (3) placing the prepared ceramsite raw material in a curing room with the temperature of 20 +/-5 ℃ and the relative humidity of not less than 95%, curing for 5h, then placing the ceramsite raw material in steam curing equipment with the temperature of 70 ℃, curing for 6.5h, and taking out the ceramsite raw material to obtain the ceramsite.
Example 3
A baking-free ceramsite is prepared by the following steps:
(1) preparing an adsorbent: uniformly mixing 15 parts of zeolite powder, 10 parts of chitosan, 5 parts of active carbon and 8 parts of diatomite according to a ratio;
(2) preparing materials: weighing 30 parts of sludge ash, 80 parts of coal gangue, 65 parts of industrial byproduct gypsum, 40 parts of gasified slag and 15 parts of adsorbent;
(3) calcining and pretreating coal gangue: calcining the prepared coal gangue for 4 hours at the temperature of 600 ℃;
(4) preparing a plasticizer solution: preparing 40 parts of polycarboxylic acid water reducing agent, 20 parts of shrinkage reducing agent, 10 parts of retarder and 234 parts of deionized water into a solution;
(5) adjusting the pH value: grinding the components respectively, sieving the ground components with a 400-mesh sieve, uniformly mixing, adding 62 parts of plasticizer solution and 32 parts of calcium oxide, uniformly stirring, blocking and press-filtering to obtain filtrate and mixed blocks, and measuring the pH value of the filtrate to be 11.2;
(6) and (3) granulation: grinding and sieving the mixed blocks, putting the ground and sieved mixed blocks into granulation equipment, uniformly mixing the mixed blocks at the rotating speed of 40 revolutions per minute, and then spraying the filtrate into the granulation equipment, wherein the rotating speed is adjusted to 45 revolutions per minute, and the formed granular product is ceramsite raw material;
(7) and (5) maintenance: and (3) placing the prepared ceramsite raw material in a curing room with the temperature of 20 +/-5 ℃ and the relative humidity of not less than 95%, curing for 10h, then placing the mixture in steam curing equipment with the temperature of 50 ℃ for curing for 10h, and taking out the mixture to obtain the ceramsite.
Example 4
A baking-free ceramsite is prepared by the following steps:
(1) preparing an adsorbent: uniformly mixing 15 parts of zeolite powder, 20 parts of chitosan, 10 parts of active carbon and 10 parts of diatomite according to a ratio;
(2) preparing materials: weighing 40 parts of sludge ash, 70 parts of coal gangue, 75 parts of industrial byproduct gypsum, 40 parts of gasified coal slag and 15 parts of adsorbent;
(3) calcining and pretreating coal gangue: calcining the prepared coal gangue for 5 hours at the temperature of 500 ℃;
(4) preparing a plasticizer solution: preparing 35 parts of polycarboxylic acid water reducing agent, 20 parts of shrinkage reducing agent, 5 parts of retarder and 200 parts of deionized water into a solution;
(5) adjusting the pH value: grinding the components respectively, sieving the ground components with a 400-mesh sieve, uniformly mixing, adding 85 parts of plasticizer solution and 38 parts of pH regulator, wherein the pH regulator is prepared by mixing sodium hydroxide and potassium hydroxide according to a molar ratio of 1: 1, stirring uniformly, blocking and filter-pressing to obtain filtrate and mixed blocks, and measuring the pH value of the filtrate to be 11.4;
(6) and (3) granulation: grinding and sieving the mixed blocks, putting the ground and sieved mixed blocks into granulation equipment, uniformly mixing the mixed blocks at the rotating speed of 35 revolutions per minute, and then spraying the filtrate into the granulation equipment, wherein the rotating speed is adjusted to be 55 revolutions per minute, and the formed granular product is ceramsite raw material;
(7) and (5) maintenance: and (3) placing the prepared ceramsite raw material in a curing room with the temperature of 20 +/-5 ℃ and the relative humidity of not less than 95%, curing for 5 hours, then placing the ceramsite raw material in steam curing equipment with the temperature of 80 ℃ for curing for 6 hours, and taking out the ceramsite raw material to obtain the ceramsite.
Example 5
A baking-free ceramsite is prepared by the following steps:
(1) preparing an adsorbent: uniformly mixing 15 parts of zeolite powder, 10 parts of chitosan, 10 parts of active carbon and 15 parts of diatomite according to a ratio;
(2) preparing materials: weighing 50 parts of sludge ash, 60 parts of coal gangue, 25 parts of industrial byproduct gypsum, 50 parts of gasified slag and 20 parts of adsorbent;
(3) calcining and pretreating coal gangue: calcining the prepared coal gangue for 1 hour at the temperature of 900 ℃;
(4) preparing a plasticizer solution: preparing 25 parts of polycarboxylic acid water reducing agent, 20 parts of shrinkage reducing agent, 8 parts of retarder and 210 parts of deionized water into a solution;
(5) adjusting the pH value: grinding all the components respectively, sieving the ground components with a 400-mesh sieve, uniformly mixing, adding 70 parts of plasticizer solution and 42 parts of pH regulator, wherein the pH regulator is prepared by mixing sodium hydroxide and calcium oxide according to a molar ratio of 1: 1, stirring uniformly, blocking and filter-pressing to obtain filtrate and mixed blocks, and measuring the pH value of the filtrate to be 12;
(6) and (3) granulation: grinding and sieving the mixed blocks, putting the ground and sieved mixed blocks into granulation equipment, uniformly mixing the mixed blocks at the rotating speed of 30 revolutions per minute, and then spraying the filtrate into the granulation equipment, wherein the rotating speed is adjusted to be 50 revolutions per minute, and the formed granular product is ceramsite raw material;
(7) and (5) maintenance: and (3) placing the prepared ceramsite raw material in a curing room with the temperature of 20 +/-5 ℃ and the relative humidity of not less than 95%, curing for 6h, then placing the ceramsite raw material in steam curing equipment with the temperature of 70 ℃, curing for 8.5h, and taking out the ceramsite raw material to obtain the ceramsite.
Example 6
A baking-free ceramsite is prepared by the following steps:
(1) preparing an adsorbent: 5 parts of zeolite powder, 10 parts of chitosan, 5 parts of active carbon and 10 parts of diatomite are uniformly mixed according to the proportion;
(2) preparing materials: weighing 25 parts of sludge ash, 50 parts of coal gangue, 35 parts of industrial byproduct gypsum, 25 parts of gasified coal slag and 15 parts of adsorbent;
(3) calcining and pretreating coal gangue: calcining the prepared coal gangue for 3 hours at the temperature of 700 ℃;
(4) preparing a plasticizer solution: preparing 20 parts of polycarboxylic acid water reducing agent, 10 parts of shrinkage reducing agent, 5 parts of retarder and 175 parts of deionized water into a solution;
(5) adjusting the pH value: grinding all the components respectively, sieving the ground components with a 400-mesh sieve, uniformly mixing, adding 48 parts of plasticizer solution and 28 parts of pH regulator, wherein the pH regulator is potassium hydroxide and calcium oxide according to a molar ratio of 1: 1, preparing, stirring uniformly, blocking and filter-pressing to obtain filtrate and mixed blocks, and measuring the pH value of the filtrate to be 12;
(6) and (3) granulation: grinding and sieving the mixed blocks, putting the ground and sieved mixed blocks into granulation equipment, uniformly mixing at the rotating speed of 35 revolutions per minute, and then spraying the filtrate into the granulation equipment, wherein the rotating speed is adjusted to be 60 revolutions per minute, and the formed granular product is ceramsite raw material;
(7) and (5) maintenance: and (3) placing the prepared ceramsite raw material in a curing room with the temperature of 20 +/-5 ℃ and the relative humidity of not less than 95%, curing for 2h, then placing the ceramsite raw material in steam curing equipment with the temperature of 60 ℃ for curing for 9h, and taking out the ceramsite raw material to obtain the ceramsite.
Example 7
A baking-free ceramsite is prepared by the following steps:
(1) preparing an adsorbent: uniformly mixing 10 parts of zeolite powder, 15 parts of chitosan, 8 parts of active carbon and 10 parts of diatomite according to a ratio;
(2) preparing materials: weighing 35 parts of sludge ash, 65 parts of coal gangue, 40 parts of industrial byproduct gypsum, 35 parts of gasified coal slag and 18 parts of adsorbent;
(3) calcining and pretreating coal gangue: calcining the prepared coal gangue for 4 hours at the temperature of 600 ℃;
(4) preparing a plasticizer solution: preparing 35 parts of polycarboxylic acid water reducing agent, 20 parts of shrinkage reducing agent, 8 parts of retarder and 252 parts of deionized water into a solution;
(5) adjusting the pH value: grinding all the components respectively, sieving with a 400-mesh sieve, mixing uniformly, adding 57 parts of plasticizer solution and 32 parts of calcium oxide, stirring uniformly, blocking and press-filtering to obtain filtrate and mixed blocks, and measuring the pH value of the filtrate to be 11.5;
(6) and (3) granulation: grinding and sieving the mixed blocks, putting the ground and sieved mixed blocks into granulation equipment, uniformly mixing at the rotating speed of 35 revolutions per minute, and then spraying the filtrate into the granulation equipment, wherein the rotating speed is adjusted to be 50 revolutions per minute, and the formed granular product is ceramsite raw material;
(7) and (5) maintenance: and (3) placing the prepared ceramsite raw material in a curing room with the temperature of 20 +/-5 ℃ and the relative humidity of not less than 95%, curing for 6h, then placing the ceramsite raw material in steam curing equipment with the temperature of 70 ℃ for curing for 8h, and taking out the ceramsite raw material to obtain the ceramsite.
Example 8
A baking-free ceramsite is prepared by the following steps:
(1) preparing an adsorbent: 5 parts of zeolite powder, 25 parts of chitosan, 10 parts of active carbon and 15 parts of diatomite are uniformly mixed according to the proportion;
(2) preparing materials: weighing 45 parts of sludge ash, 75 parts of coal gangue, 60 parts of industrial byproduct gypsum, 25 parts of gasified coal slag and 15 parts of adsorbent;
(3) calcining and pretreating coal gangue: calcining the prepared coal gangue for 3 hours at the temperature of 800 ℃;
(4) preparing a plasticizer solution: preparing 25 parts of polycarboxylic acid water reducing agent, 30 parts of shrinkage reducing agent, 10 parts of retarder and 220 parts of deionized water into a solution;
(5) adjusting the pH value: grinding all the components respectively, sieving the ground components with a 400-mesh sieve, uniformly mixing the ground components, adding 71 parts of plasticizer solution and 41 parts of potassium hydroxide, uniformly stirring the mixture, blocking and press-filtering the mixture to obtain filtrate and mixed blocks, and measuring the pH value of the filtrate to be 11.8;
(6) and (3) granulation: grinding and sieving the mixed blocks, putting the ground and sieved mixed blocks into granulation equipment, uniformly mixing the mixed blocks at the rotating speed of 40 revolutions per minute, and then spraying a certain amount of pH regulator into the granulation equipment, wherein the rotating speed is regulated to 35 revolutions per minute, and the formed granular product is ceramsite raw material;
(7) and (5) maintenance: and (3) placing the prepared ceramsite raw material in a curing room with the temperature of 20 +/-5 ℃ and the relative humidity of not less than 95%, curing for 8h, then placing the ceramsite raw material in steam curing equipment with the temperature of 90 ℃ for curing for 5h, and taking out the ceramsite raw material to obtain the ceramsite.
The ceramisites prepared in examples 1 to 8 were each tested using the test methods for bulk density, cylinder strength and water absorption in GB/T17431.2-2010, with the results shown in the following table:
remarking: the initial cylinder pressure strength is the curing strength measured after the curing of the ceramsite is finished. After the test is finished, placing the ceramsite into a curing room, curing the ceramsite for 7d and 28d under the conditions that the temperature is 20 +/-2 ℃ and the relative humidity is not less than 95 percent, and testing the strength of the ceramsite; the water absorption rate of 1 hour is measured by airing after the ceramsite is steamed and cured.
Detecting the heavy metal content in the sludge, putting the ceramsite into distilled water for a leaching toxicity identification test, and selecting a plasma atomic emission spectrometer for detecting the heavy metal content in the ceramsite leaching solution according to the test result, wherein the test result is shown in the following table:
remarking: GB3838-2002 'quality standard of surface water environment' stipulates that the Cu content is not more than 0.01mg/L, the Zn content is not more than 0.05mg/L, the Pb content is not more than 0.01mg/L, the Cd content is not more than 0.001mg/L, the Cr content is not more than 0.01mg/L, the Hg content is not more than 0.00005mg/L, and the As content is not more than 0.05 mg/L.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (10)
1. The baking-free ceramsite is characterized by comprising the following components in parts by weight: 10-50 parts of sludge ash, 50-100 parts of coal gangue, 25-75 parts of industrial byproduct gypsum, 10-50 parts of gasified slag, 5-25 parts of adsorbent and 40-90 parts of plasticizer.
2. The non-fired ceramsite according to claim 1, wherein the adsorbent comprises the following components in parts by weight: 5-20 parts of zeolite powder, 10-30 parts of chitosan, 1-10 parts of activated carbon and 5-20 parts of diatomite.
3. The baking-free ceramsite according to claim 1, wherein the plasticizer comprises the following components in parts by weight: 20-40 parts of polycarboxylic acid water reducing agent, 10-30 parts of shrinkage reducing agent, 1-10 parts of retarder and 120-270 parts of deionized water.
4. The baking-free ceramsite of claim 1, wherein the content of silica in the sludge ash is not less than 30% and the content of alumina in the sludge ash is not less than 18%.
5. The baking-free ceramsite of claim 1, wherein the gangue contains silica not less than 15%, alumina not less than 3%, and calcium oxide not less than 50%.
6. The baking-free ceramsite of claim 1, wherein the industrial byproduct gypsum contains calcium sulfate hemihydrate not less than 75%, calcium sulfate dihydrate less than 10%, and free water less than 5%.
7. The baking-free ceramsite of claim 1, wherein the content of calcium oxide, silicon oxide and aluminum oxide in the gasified slag is not less than 40%, not less than 30% and not less than 15%.
8. The baking-free ceramsite of claim 1, wherein SiO in the zeolite powder250-70% of Al2O3The content is 10-20%.
9. The baking-free ceramsite is characterized by comprising the following steps:
a. preparing an adsorbent: 5-20 parts of zeolite powder, 10-30 parts of chitosan, 1-10 parts of activated carbon and 5-20 parts of diatomite.
b. Preparing materials: weighing 10-50 parts of sludge ash, 50-100 parts of coal gangue, 25-75 parts of industrial byproduct gypsum, 10-50 parts of gasified slag and 5-20 parts of adsorbent;
c. calcining and pretreating coal gangue: calcining the prepared coal gangue at 500-900 ℃ for 1-5 hours;
d. preparing a plasticizer solution: preparing 20-40 parts of polycarboxylic acid water reducing agent, 10-30 parts of shrinkage reducing agent, 1-10 parts of retarder and 120-270 parts of deionized water into a solution, wherein the surface tension of the solution is less than 35mN/m, and the water reduction rate is more than 20%;
e. adjusting the pH value: b, respectively grinding and uniformly mixing the sludge ash, coal gangue, industrial byproduct gypsum, gasified slag and adsorbent weighed in the step a, adding 30-85 parts of plasticizer solution and pH regulator, stirring uniformly, blocking and press-filtering to obtain filtrate and mixed blocks, and measuring the pH value of the filtrate;
if the pH value of the filtrate is less than 11, uniformly mixing the filtrate and the mixed block again, then continuously adding a pH regulator, stirring uniformly, blocking and filter-pressing to obtain the filtrate and the mixed block, measuring the pH value of the filtrate again until the pH value of the filtrate is not less than 11, and then carrying out the next step;
f. and (3) granulation: d, grinding and sieving the mixed blocks determined in the step d, putting the ground mixed blocks into granulation equipment, uniformly mixing, and spraying the filtrate obtained in the step d into the granulation equipment to form a granular product which is a ceramsite raw material;
g. and (5) maintenance: and placing the prepared ceramsite raw material into a curing chamber for curing, then placing the cured ceramsite raw material into steam curing equipment for curing, and taking out the cured ceramsite raw material to obtain the ceramsite.
10. The method for preparing baking-free ceramsite according to claim 9, wherein the temperature in the curing chamber is 20 ± 5 ℃, the relative humidity is not less than 90%, and the curing time is 2-10 hours; the temperature in the steam curing equipment is 50-90 ℃, and the curing time is 4-10 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010408662.8A CN111548111B (en) | 2020-05-14 | 2020-05-14 | Baking-free ceramsite and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010408662.8A CN111548111B (en) | 2020-05-14 | 2020-05-14 | Baking-free ceramsite and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111548111A true CN111548111A (en) | 2020-08-18 |
| CN111548111B CN111548111B (en) | 2022-05-20 |
Family
ID=72002770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010408662.8A Active CN111548111B (en) | 2020-05-14 | 2020-05-14 | Baking-free ceramsite and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111548111B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103145442A (en) * | 2013-03-28 | 2013-06-12 | 南京工业大学 | Method for preparing non-sintered ceramisites by using chemical sludge |
| CN106167361A (en) * | 2016-08-10 | 2016-11-30 | 卓达新材料科技集团威海股份有限公司 | A kind of alkaline residue building waste haydite and preparation method thereof |
| CN110452012A (en) * | 2019-08-23 | 2019-11-15 | 成都德菲环境工程有限公司 | A kind of method that gangue cooperates with resource utilization to prepare haydite with coal gas slugging |
| US20200048147A1 (en) * | 2017-04-19 | 2020-02-13 | Qingdao Yi Eco-Environmental Protection Technology Co. Ltd | Method for preparing ceramsite by using municipal sludge as raw material |
| CN110963783A (en) * | 2019-12-26 | 2020-04-07 | 中建西部建设股份有限公司 | Sludge-based high-strength ceramsite and preparation method thereof |
-
2020
- 2020-05-14 CN CN202010408662.8A patent/CN111548111B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103145442A (en) * | 2013-03-28 | 2013-06-12 | 南京工业大学 | Method for preparing non-sintered ceramisites by using chemical sludge |
| CN106167361A (en) * | 2016-08-10 | 2016-11-30 | 卓达新材料科技集团威海股份有限公司 | A kind of alkaline residue building waste haydite and preparation method thereof |
| US20200048147A1 (en) * | 2017-04-19 | 2020-02-13 | Qingdao Yi Eco-Environmental Protection Technology Co. Ltd | Method for preparing ceramsite by using municipal sludge as raw material |
| CN110452012A (en) * | 2019-08-23 | 2019-11-15 | 成都德菲环境工程有限公司 | A kind of method that gangue cooperates with resource utilization to prepare haydite with coal gas slugging |
| CN110963783A (en) * | 2019-12-26 | 2020-04-07 | 中建西部建设股份有限公司 | Sludge-based high-strength ceramsite and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111548111B (en) | 2022-05-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112979192B (en) | Preparation method of lightweight aggregate | |
| CN110451903B (en) | Composite cementing material and method for cementing high-sulfur superfine lead-zinc ore tailings | |
| CN110734257A (en) | Preparation method of high impervious concrete | |
| CN110818293A (en) | Cementing material containing a large amount of waste incineration fly ash and slag, and preparation method and application thereof | |
| CN107857499B (en) | Prepare method, cement admixture and the cement composition of cement admixture | |
| CN113336516A (en) | Cementing material prepared from multi-element solid wastes and cooperative regulation and control method thereof | |
| CN113213789B (en) | Paving brick prepared based on household garbage incineration fly ash and preparation method thereof | |
| CN114230301A (en) | Phosphogypsum hardener and preparation method and application thereof | |
| CN113264715A (en) | Heavy metal curing baking-free brick based on household garbage incineration fly ash and preparation method thereof | |
| Xue et al. | Self-solidification/stabilisation of electrolytic manganese residue: mechanistic insights | |
| CN103979807A (en) | Construction waste regenerated high-activity mineral admixture and preparation thereof | |
| CN112125543A (en) | Composite gel material prepared from bulk solid wastes and preparation method thereof | |
| CN112341101A (en) | Light recycled concrete and preparation method thereof | |
| CN110950626A (en) | Autoclaved sand-lime brick and preparation method thereof | |
| CN110627433A (en) | Recycled aggregate concrete and preparation method thereof | |
| CN114163174B (en) | Solid waste base modified cementing material and application thereof | |
| CN101412595A (en) | Method for preparing concrete admixture from kaoline tailing | |
| CN114276097A (en) | Nickel slag cementing material for improving activity of nickel slag through split-phase activation and preparation method thereof | |
| CN111960701B (en) | Full-scale utilization method for reducing, roasting, separating and recovering iron and silicon-aluminum synchronous activated red mud | |
| CN111892366B (en) | Ecological hollow building block and preparation method thereof | |
| CN110563405B (en) | Environment-friendly admixture concrete and preparation process thereof | |
| CN111548111B (en) | Baking-free ceramsite and preparation method thereof | |
| CN109721262A (en) | A kind of superfined flyash and preparation method thereof | |
| CN114180709A (en) | Method for preparing porous steam-cured phosphorus removal biological filter material by utilizing waste foundry clay sand | |
| CN115536350A (en) | Road base layer paving material utilizing cooperation of various solid wastes and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 610213 No. 10, Wenhua Road, Jiancha street, Tianfu New District, Chengdu, Sichuan Applicant after: China western construction Building Materials Science Research Institute Co.,Ltd. Address before: No.12 Wenhua Road, Jiancha street, Tianfu New District, Chengdu, Sichuan 610000 Applicant before: ZHONGJIAN MATERIAL TECHNOLOGY RESEARCH CHENGDU Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |