The present invention relates to the technical field of gypsum. Provided are a gypsum hardened body, and a preparation method therefor and the use thereof. The method comprises: mixing powdery gypsum, a retarder and water and then grinding same, followed by immediate molding, so as to obtain the gypsum hardened body, wherein the total time of mixing and grinding is 2-5 min, and the amount of water added during mixing accounts for 8-30% of the total mass of the powdery gypsum. The gypsum hardened body prepared by using the method has significantly improved mechanical properties and low porosity, and can be used for preparing a lightweight aggregate, mechanically pressed components, mechanically pressed modules or mother rock of regenerated gravel aggregates, such that the application range of the gypsum hardened body is greatly expanded, and in particular the application performance of building gypsum is improved; and the gypsum hardened body is very suitable for preparing high-strength and high-quality ardealite building material products.
C04B 28/14 - 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
B28C 5/10 - Mixing in containers not actuated to effect the mixing
B28C 7/02 - Controlling the operation of the mixing
2.
DEVICE FOR SMELTING AND REGENERATING PHOSPHOGYPSUM USING HIGH-TEMPERATURE CERAMSITE AND METHOD FOR USING SAME
The present invention provides a device for smelting and regenerating phosphogypsum using high-temperature ceramsite and method for using same, where a rotary kiln is used to accept high-temperature ceramic granules that have been calcined and formed. The residual heat of the high-temperature ceramic granules allows them to be fully mixed with the phosphogypsum. On one hand, the high temperature of the ceramic granules achieves high-temperature dehydration of the phosphogypsum. On the other hand, the porous adsorption property of the ceramic granules can facilitate full absorption of some harmful substances in the phosphogypsum, thereby realizing the purification of the phosphogypsum. In addition, because the dehydrated phosphogypsum is generally in a suspended state, the rotary kiln of the present invention is equipped with a discharge outlet at the end. The discharge outlet uses a combination of a cyclone dust aspirator and a baghouse dust collector, which can draw out the phosphogypsum that has been fully dehydrated and is suspended in the rotary kiln, thereby realizing its complete collection without any leakage and achieving zero pollution.
C04B 11/26 - Calcium sulfate cements starting from phosphogypsum or from waste, e.g. purification products of smoke
F27B 7/16 - Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum
The present invention belongs to the technical fields of phosphogypsum harm-reduction processing and construction materials, and specifically provides a phosphogypsum-based construction material, and the preparation and application thereof. The method comprises: adding into ceramsite having a temperature of at least 800℃ a phosphogypsum premix which has a preprocessed temperature of 60℃ or above, a free water content of less than or equal to 10%, and an organic matter content of 5-20%; performing combustion using the residual heat of the ceramsite, continuously mixing and calcining, separating out ceramsite coarse aggregate, and performing postprocessing on the resulting excess material so as to obtain the phosphogypsum-based construction material. The method of the present invention not only fully utilizes phosphogypsum solid waste while synchronously achieving harm-reduction processing of the phosphogypsum, but more importantly, the method of the present invention achieves a synergy between ceramsite and phosphogypsum, making it so that the prepared phosphogypsum-based construction material has a higher strength, a more uniform structure, and a broader range of applications.
The present invention relates to the technical field of phosphogypsum dehydration treatment, and provides a device for carrying out calcination-type harmless treatment on phosphogypsum by using high-temperature ceramsite, comprising a rotary kiln, a first feeding member, a second feeding member, and a sorting assembly. The rotary kiln comprises a first rotary kiln cylinder and a second rotary kiln cylinder; a first interlayer channel is formed between the first rotary kiln cylinder and the second rotary kiln cylinder, and the head end of the first interlayer channel is communicated with the head end of the first rotary kiln cylinder; the first feeding member is used for delivering high-temperature ceramsite into the first rotary kiln cylinder; the second feeding member is used for delivering phosphogypsum into the first interlayer channel; the mixed materials in the first rotary kiln cylinder and the phosphogypsum in the first interlayer channel can exchange heat so as to dehydrate the phosphogypsum; the sorting assembly is used for sorting the mixed materials output from the first rotary kiln cylinder to obtain calcined phosphogypsum. The present invention has high calcination and dehydration efficiency for phosphogypsum, and achieves low-carbonization harmless treatment of phosphogypsum to obtain phosphorus building gypsum.
A method for preparing building materials from sludge containing excessive heavy metals by using a triple solidification technique, comprising material selection, preparation of modified sludge, high temperature treatment, oscillation mixing, preparation of modified slag, and mixing and forming of raw materials, wherein the raw materials comprise sludge, iron ore slag, lightweight aggregate, coal ash, a sludge solidified agent, cement and sand. The heavy metals in the sludge are passivated by means of the solidified agent to achieve first layer sealing, then dust and the internal heavy metals penetrate into pores of the lightweight aggregate for secondary sealing through the action of a high-frequency oscillator, and finally the treated lightweight aggregate is mixed with cement, sand and the like for third sealing, so that triple solidification of the heavy metals is achieved, the harm of the heavy metals is reduced, such waste from sludge and industrial tailings is rationally reused, the space occupied by the sludge and industrial tailings is saved, the influence of the waste such as sludge and industrial tailings on the environment is reduced, and a lot of resources are saved.
C04B 28/00 - 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
C04B 40/00 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
Disclosed in the present invention are a device for preparing an energy-saving material by combining dehydrated phosphogypsum and industrial slag, and a use method, comprising a crushing box, a first mixing hopper and a second mixing hopper. An insertion slot is provided in the top of the crushing box, and two first bearings are fixedly mounted on one side of an inner cavity of the crushing box. Crushing rollers are fixedly mounted on inner sides of both first bearings, and gears are fixedly mounted on the ends of the crushing rollers away from the first bearings. A protection box is fixedly mounted on one side of the crushing box; and a crushing motor is fixedly mounted on the inner side of the protection box. By means of mixing and crushing dehydrated phosphogypsum and industrial slag to prepare a novel energy-saving material, waste utilization of dehydrated phosphogypsum and industrial slag can be effectively performed, and preparation is convenient. Phosphogypsum can thus be effectively utilized, the utilization rate of phosphogypsum is improved, phosphogypsum surrounding a phosphating plant is effectively utilized, and thus the huge quantity of solid waste residues occupying land is reduced, encroachment on arable fields is reduced, and pollution of the surrounding environment is reduced.
A device for preparing a soil conditioner by combining phosphogypsum and biomass fuel tailings, comprising a bottom plate (1). A support frame (10) is fixedly mounted at the top of the bottom plate (1); a combustion box (11) is fixedly mounted at the top of the support frame (10); a horizontal slag discharge pipe (14) is fixedly mounted at the bottom of the combustion box (11); a slag discharge motor (15) is fixedly mounted at one end of the horizontal slag discharge pipe (14); a rotating rod (16) is fixedly mounted at an output end of the slag discharge motor (15); a spiral slag discharge plate (17) is fixedly sleeved outside the rotating rod (16); a slag inlet pipe (18) is fixedly mounted at one end of the horizontal slag discharge pipe (14) distant from the slag discharge motor (15); support columns (19) are fixedly mounted at the top of the bottom plate (1). The tailings left by biomass particles combusted in the combustion box (11) automatically fall into the horizontal slag discharge pipe (14), the mounted slag discharge motor (15) is started to drive the spiral slag discharge plate (17) to rotate, and the tailings can be fed into a stirring cylinder (20) during rotation.
A device for smelting and regenerating phosphogypsum using high-temperature ceramsite, comprising a rotary kiln, a cyclone dust collector and a cloth bag dust collector, wherein the rotary kiln is provided with a feeding port for inputting phosphogypsum and ceramsite, the rotary kiln is arranged in an inclined manner, a driving wheel is provided outside the rotary kiln, the drive wheel is connected to an electric motor to drive the rotary kiln to rotate, a stirring scraper is provided on an inner circumferential surface of the rotary kiln, the stirring scraper is uniformly and spirally arranged on the inner circumferential surface of the rotary kiln, the rotary kiln is in communication with the cyclone dust collector via a delivery pipe, and an end of the cyclone dust collector is in communication with the cloth bag dust collector. A method for pollution-free dehydration of phosphogypsum by using waste heat of ceramsite, comprises: introducing water-containing phosphogypsum and high-temperature ceramsite into the rotary kiln through the feeding port; controlling the rotary kiln to rotate, so that the water-containing phosphogypsum in the kiln is fully mixed and contacted with the high-temperature ceramsite; and starting the cloth bag dust collector to extract and collect the dehydrated suspended phosphogypsum under a negative pressure.
A system and method for cyclone-type self-absorption storage of dehydrated phosphogypsum. The system comprises a foundation base (1). A first telescopic rod member (4) is fixedly mounted at the top of the foundation base (1); a first box body (5) is fixedly mounted at the top of the first telescopic rod member (4); a fixing block (6) is fixedly mounted at the top of the first box body (5); a first rotating shaft (7) is movably mounted in the fixing block (6); a second telescopic rod member (8) is fixedly mounted on one side of the first rotating shaft (7); a second box body (10) is fixedly mounted at an end portion of the second telescopic rod member (8); and one side of the second box body (10) communicates with a feeding pipe (15). By providing the related second box body (10), a drying box (13), a first driving electric motor (12) and a mixing device (16), when a related production operation is performed on the whole system, a related stirring and mixing device and the drying device can be used, such that when the related production operation is performed, the whole dehydration process can be more stable, which can effectively avoid problems where the phosphogypsum is prone to agglomerating, it is difficult to dehydrate the interior after agglomeration, and the dehydration effect is affected.
F26B 11/08 - Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a vertical or steeply-inclined axis
F26B 21/00 - Arrangements for supplying or controlling air or gases for drying solid materials or objects
F26B 25/00 - Details of general application not covered by group or
F26B 25/02 - Applications of driving mechanisms, not covered by another subclass
F26B 25/04 - Agitating, stirring, or scraping devices
Disclosed is a method for preparing an energy-saving, fireproof and sound-insulating wall material using sludge solid waste combined with industrial slag. The preparation method comprises the following step: material selection: 10-15 parts of sludge solid waste; 20-25 parts of iron ore slag; 4-7 parts of sodium carbonate; 25-50 parts of coal ash; 4-16 parts of a silicon source material; 8-12 parts of organic matter; 0.1-0.25 parts of a modifier; 0.1-0.25 parts of a foam stabilizer; and 10-15 parts of perlite. The wall body made by the method internally comprises air holes formed after sodium carbonate maintenance and cracks inside perlite. After sound transmission, the internal cracks enable sound waves to be converted into thermal energy through fine holes of the material, thereby achieving a sound absorption effect. In addition, the wall body as a whole is made of a non-combustible substance, and has good fireproof performance.
C04B 28/00 - 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
C04B 38/00 - Porous mortars, concrete, artificial stone or ceramic warePreparation thereof
C04B 38/08 - Porous mortars, concrete, artificial stone or ceramic warePreparation thereof by adding porous substances
B28B 1/29 - Producing shaped articles from the material by profiling or strickling the material in open moulds or on moulding surfaces
B28B 11/24 - Apparatus or processes for treating or working the shaped articles for curing, setting or hardening
B28B 13/02 - Feeding the unshaped material to moulds or apparatus for producing shaped articles
B28B 17/02 - Conditioning the material prior to shaping
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