CN104310826A - Method for carrying out solid-liquid separation on high-temperature alpha gypsum slurry - Google Patents
Method for carrying out solid-liquid separation on high-temperature alpha gypsum slurry Download PDFInfo
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Abstract
The invention discloses a method for carrying out solid-liquid separation on high-temperature alpha gypsum slurry. The method comprises the following steps: (1) carrying out primary crystallization; (2) carrying out secondary crystallization; (3) carrying out high-temperature dehydration and solid-liquid separation; (4) conveying the material; (5) enabling dehydrated mud-like alpha gypsum to enter a flash dryer. The keys are as follows: heat insulation covers are additionally installed on a vacuum belt conveyor and a belt conveyor, and heat insulation and heating are achieved by injecting high-temperature steam or high-temperature air or directly heating air; the temperature of the high-temperature steam or the high-temperature air is 100-260 DEG C; the material temperature of alpha semi-hydrated gypsum when passing through the vacuum belt conveyor and the belt conveyor is controlled between 97 DEG C and 150 DEG C. Solid-liquid separation of alpha gypsum slurry under the condition of high temperature can be achieved by adopting the method.
Description
Technical field
The present invention relates to the production and processing method of gypsum, be specifically related to a kind of solid-liquid separating method of α gypsum high temperature slurries.
Background technology
At present, Liquid preparation methods αsemiwatergypsum is a kind of preparation method of novel high strength gypsum, its process is: Gypsum Mine or desulfurated plaster or phosphogypsum are ground to form the particulate state dihydrate gypsum powder of fineness between 10-100 μm, dihydrate gypsum powder be mixed into water in mixing tank concentration 30 ~ 40% Gypsum slurry, and be heated to 30 DEG C ~ 100 DEG C, Gypsum slurry after being mixed enters through shurry pump and turns in brilliant device, temperature 90 DEG C ~ 150 DEG C, under pressure 3.0 ~ 5.0MPa condition, crystallization is first carried out under the effect of crystal modifier maleic anhydride, generate the α gypsum slurry of about 98%.On crystallization basis first, the α gypsum slurry of generation enters in another turn of brilliant device, under temperature 110 DEG C ~ 150 DEG C, pressure 3.0 ~ 4.0MPa condition, under the effect of crystal modifier maleic anhydride, carries out secondary crystal, generates the α gypsum slurry of 100%.α gypsum slurry through be separated, drying obtain 100% α gypsum crystal particle.One of difficult point of the method is difficult to α gypsum slurries under high temperature 97 DEG C ~ 150 DEG C conditions to carry out solid-liquid separation.
Existing solid-liquid separation technique is divided into two kinds, and one is adopt vertical or horizontal centrifuge, utilizes difference in specific gravity to carry out solid-liquid separation to gypsum slurries.This technology is the most frequently used, also the most ripe.Two is adopt vacuum belt machine centering low temperature (lower than 97 DEG C) gypsum slurries to carry out solid-liquid separation, and also nobody adopts this technology to carry out solid-liquid separation for the Gypsum slurry under high temperature at present.
Horizontal screw centrifuge is the precipitation apparatus of a kind of horizontal screw unloading, operate continuously.This kind of whizzer principle of work is: rotary drum and conveying spiral inner core rotate with certain differential same-directional high-speed, material introduces conveying spiral inner core continuously by feed-pipe, enter rotary drum after acceleration, under effect of centrifugal force, heavier solid formation is deposited on rotatory drum wall and forms sediment layer.The solid formation of deposition is continuously pushed into rotary drum cone end by conveying spiral inner core, outside slag-drip opening discharge machine.Lighter liquid phase thing then forms internal layer pendular ring, overflows rotary drum continuously, outside leakage fluid dram discharge machine by the large end overflow port of rotary drum.This function under full-speed operation, continuously feeding, separation, washing and discharging.But this whizzer is not suitable for the solid-liquid separation of high temperature slip.
The dual function that the whole system of vertical centrifugal machine applies centrifugal force and gravity cleverly achieves the non-stop run of equipment, reaches very high working efficiency.Slurry enters whizzer by opening for feed, is subject to the effect of centrifugal force, retains solid by filter screen in separation system, and liquid enters filtering cabin through screen cloth and discharged by mother liquor mouth.Solid, at the component moved downward of gravity and centrifugal force, enters workshop section of subordinate by discharging bin.In moving process, pump into washings by washing system and solid is washed.All power is driven by a motor.In sepn process, the residence time of solid in separation system can be controlled by regulating the relative position of input speed and separation system each several part, reaching the solid aqueous amount requirement of regulation.
Vacuum belt machine a kind ofly makes full use of the mechanical means that material gravity and pull of vacuum realize solid-liquid separation.Structurally vacuum zone is arranged in the horizontal direction, different process processes such as utilizing the length of vacuum zone can complete filtration continuously, wash, blot, have that filter effect is high, throughput is large, washing effect is good, applied range, simple to operate, operate steadily, the advantage such as maintaining is convenient; Be particularly suitable for filtering the solid-liquid separation that the large and filter cake of thick, the density of solid phase particles needs the suspension slip repeatedly washed.Because vacuum belt machine is when solid-liquid separation, do not take heating, temperature keeping measure, filter cake can be lowered the temperature rapidly in the process, and αsemiwatergypsum is easy to that chemical reaction occurs in a short period of time under cryogenic becomes dihydrate gypsum and solidify, thus causes scrapping of material.
Summary of the invention
The object of the present invention is to provide a kind of solid-liquid separating method of α gypsum high temperature slurries, the solid-liquid separation of α gypsum slurries under high temperature 50 DEG C ~ 260 DEG C conditions can be realized.
The object of the invention is to be reached by following technical solution:
A solid-liquid separating method for α gypsum high temperature slurries, comprises the steps:
(1) crystallization first.Gypsum Mine or desulfurated plaster or phosphogypsum are ground to form particle fineness and be distributed in dihydrate gypsum powder between 10 ~ 100 μm, dihydrate gypsum powder be mixed into water in mixing tank concentration 30 ~ 40% Gypsum slurry, and be heated to 30 DEG C ~ 100 DEG C, Gypsum slurry after being mixed enters in reactor through shurry pump, under temperature 90 DEG C ~ 150 DEG C, pressure 3.0 ~ 5.0MPa condition, and crystallization is first carried out under the effect of crystal modifier maleic anhydride, generate the α gypsum slurries of about 98%.
(2) secondary crystal.On crystallization basis first, the α gypsum slurries of generation enters in another reactor, under temperature 110 DEG C ~ 150 DEG C, pressure 3.0 ~ 4.0MPa condition, and carries out secondary crystal under the effect of crystal modifier maleic anhydride, generates the α gypsum slurries of 100%.
(3) high temperature dehydration, solid-liquid separation.Discharge on vacuum belt machine by high temperature α gypsum slurries, now slurry temperature 110 DEG C ~ 150 DEG C, the vacuum box distributed under vacuum hydro-extraction belt forms a long vacuum pumping district, and its vacuum degree control is 0 ~ 1MPa;
The running of vacuum hydro-extraction belt carrying high temperature α gypsum slurries, starts to dewater to it, now must carry out guarantor's mild heat to the material on vacuum belt machine, lower the temperature to prevent material; Adopt and on vacuum belt machine, install stay-warm case additional and the way injecting high-temperature steam or high temperature air carries out guarantor's mild heat, the temperature of high-temperature steam or high temperature air is between 100 DEG C ~ 260 DEG C; While Heat preservation, take pressurize measure or not pressurize, pressurize scope is 0 ~ 4MPa; αsemiwatergypsum controls between 50 DEG C ~ 260 DEG C by the temperature of charge of vacuum belt machine;
In order to ensure dehydration rate, can apply vibrations or apply mechanical pressure on vacuum hydro-extraction belt on material, vibrational acceleration is 0 ~ 10G(G is universal gravity constant), the pressure range of mechanical pressure is 0 ~ 2MPa; When the dehydration of α gypsum slurries is complete, moisture control, 0 ~ 30%, forms a kind of α gypsum purees.
(4) material transmission.The α gypsum purees of dewatering complete enters rotary conveyor, now must carry out guarantor's mild heat to the material on rotary conveyor, lower the temperature to prevent material; Adopt and on rotary conveyor, install stay-warm case additional and the way injecting high-temperature steam or high temperature air carries out guarantor's mild heat, the temperature of high-temperature steam or high temperature air is between 100 DEG C ~ 260 DEG C; While Heat preservation, take pressurize measure or not pressurize, pressurize scope is 0 ~ 4MPa; αsemiwatergypsum temperature of charge on a moving belt controls between 50 DEG C ~ 260 DEG C.
While implementation step (3) high temperature dehydration and step (4) material transmit, need the belt transport speed controlling vacuum belt machine and rotary conveyor, ensure that material is less than 15 minutes in the Heat preservation stage residence time of step (3) and step (4), namely the dewatering time of αsemiwatergypsum material and delivery time sum are less than 15 minutes.
(5) the α gypsum purees of dewatering complete enters flash dryer.
A kind of optimal technical scheme, under the described vacuum hydro-extraction belt of step (3), the vacuum tightness of vacuum box is 0.075Mpa.
A kind of optimal technical scheme, step (3) is described to be applied vibrations or apply mechanical pressure on material on vacuum hydro-extraction belt, and vibrational acceleration is 0 ~ 10G(G is universal gravity constant), the pressure range of mechanical pressure is 0 ~ 1MPa.
A kind of optimal technical scheme, step (3) is described to be applied vibrations or apply mechanical pressure on material on vacuum hydro-extraction belt, and vibrational acceleration is 0 ~ 10G(G is universal gravity constant), the pressure range of mechanical pressure is 1 ~ 2MPa.
A kind of optimal technical scheme, step (3) described employing on vacuum belt machine, install stay-warm case injection high temperature air additional and stay-warm case injection high temperature air is installed in step (4) described employing additional on rotary conveyor, adopt thermal oil directly to air heating, allow air themperature reach 100 DEG C ~ 200 DEG C, or directly pass into the heat smoke between temperature 100 DEG C ~ 200 DEG C; αsemiwatergypsum temperature of charge on a moving belt controls between 97 DEG C ~ 150 DEG C.
A kind of optimal technical scheme, on step (3) and step (4) described vacuum belt machine and the stay-warm case that rotary conveyor installs additional separately make, unified heat supply, is convenient to unified control αsemiwatergypsum temperature of charge.
A kind of optimal technical scheme, the Heat preservation stage residence time that step (3) high temperature dehydration and step (4) material transmit controls within 5 minutes, and namely the dewatering time of αsemiwatergypsum material and delivery time sum are less than 5 minutes.
A kind of optimal technical scheme, the Heat preservation stage residence time that step (3) high temperature dehydration and step (4) material transmit controls within 3 minutes or within 4 minutes, and namely the dewatering time of αsemiwatergypsum material and delivery time sum are less than 3 minutes or are less than 4 minutes.
A kind of optimal technical scheme, in the Heat preservation stage that step (3) high temperature dehydration and step (4) material transmit, while Heat preservation, take pressurize measure or not pressurize, pressurize scope is 0 ~ 1.6MPa.
A kind of optimal technical scheme, when the dehydration of step (3) described α gypsum slurries is complete, moisture control is 0 ~ 20%.
Advantage of the present invention:
1. after αsemiwatergypsum dehydration, water ratio is low.Both remained the advantage of vacuum belt dewatering, and turn increased the technical measures such as heating and thermal insulation, belt vibration or material pressurization simultaneously, guarantee that moisture control is 0 ~ 30%;
2, can not lump after αsemiwatergypsum dehydration.
3, stop αsemiwatergypsum generation hydration reaction to generate dihydrate gypsum phenomenon to occur.Owing to taking heating, temperature keeping measure, ensure that dehydration temperaturre is more than 97 DEG C, and the time in dehydration and course of conveying is no more than 5 minutes, thus eliminates the temperature and time condition that αsemiwatergypsum generation chemical reaction becomes dihydrate gypsum.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Fig. 2 is the process flow sheet in heating, temperature keeping stage in present invention process flow process.
Embodiment
Embodiment 1:
A solid-liquid separating method for α gypsum high temperature slurries, adopts following steps:
(1) crystallization first.Gypsum Mine or desulfurated plaster or phosphogypsum are ground to form particle fineness and be distributed in dihydrate gypsum powder between 10 ~ 100 μm, dihydrate gypsum powder be mixed into water in mixing tank concentration 30 ~ 40% Gypsum slurry, and be heated to 30 DEG C ~ 100 DEG C, Gypsum slurry after being mixed enters in reactor through shurry pump, under temperature 90 DEG C ~ 150 DEG C, pressure 3.0 ~ 5.0MPa condition, and crystallization is first carried out under the effect of crystal modifier maleic anhydride, generate the α gypsum slurries of about 98%.
(2) secondary crystal.On crystallization basis first, the α gypsum slurries of generation enters in another reactor, under temperature 110 DEG C ~ 150 DEG C, pressure 3.0 ~ 4.0MPa condition, and carries out secondary crystal under the effect of crystal modifier maleic anhydride, generates the α gypsum slurries of 100%.
(3) high temperature dehydration, solid-liquid separation.Discharge on vacuum belt machine by high temperature α gypsum slurries, now slurry temperature is 110 DEG C ~ 150 DEG C, and under vacuum hydro-extraction belt, the vacuum degree control of vacuum box is 0.075MPa;
Vacuum hydro-extraction belt starts to dewater to high temperature α gypsum slurries, now must carry out guarantor's mild heat to the material on vacuum belt machine, adopt and on vacuum belt machine, install stay-warm case additional and the way injecting high-temperature steam, allow vapor temperature reach 100 DEG C ~ 200 DEG C; While Heat preservation, adopt pressurize measure, pressurize scope is 0 ~ 1.6MPa; αsemiwatergypsum controls between 97 DEG C ~ 150 DEG C by the temperature of charge of vacuum belt machine;
In order to ensure dehydration rate, can apply vibrations or apply mechanical pressure on vacuum hydro-extraction belt on material, vibrational acceleration is 0 ~ 10G(G is universal gravity constant), the pressure range of mechanical pressure is 0 ~ 1MPa; When the dehydration of α gypsum slurries is complete, moisture control, 0 ~ 30%, forms α gypsum purees.
(4) material transmission.The α gypsum purees of dewatering complete enters rotary conveyor, now must carry out guarantor's mild heat to the material on rotary conveyor, adopt and on rotary conveyor, install stay-warm case additional and the way injecting high-temperature steam, the temperature of high-temperature steam is between 100 DEG C ~ 200 DEG C; While Heat preservation, adopt pressurize measure or not pressurize, pressurize scope is 0 ~ 1.6MPa; αsemiwatergypsum temperature of charge on a moving belt controls between 97 DEG C ~ 150 DEG C;
The stay-warm case installed additional on vacuum belt machine and on rotary conveyor can make an entirety.Need the belt transport speed controlling vacuum belt machine and rotary conveyor simultaneously, ensure that the Heat preservation stage residence time that material transmits in step (3) high temperature dehydration and step (4) material is less than 5 minutes, namely the dewatering time of αsemiwatergypsum material and delivery time sum are less than 5 minutes;
(5) the α gypsum purees of dewatering complete enters flash dryer.
Embodiment 2:
A solid-liquid separating method for α gypsum high temperature slurries, adopts following steps:
(1) crystallization first.With reference to embodiment 1.
(2) secondary crystal.With reference to embodiment 1.
(3) high temperature dehydration, solid-liquid separation.Discharge on vacuum belt machine by high temperature α gypsum slurries, now slurry temperature 110 DEG C ~ 150 DEG C, under vacuum hydro-extraction belt, the vacuum tightness of vacuum box is 0 ~ 1MPa;
Vacuum hydro-extraction belt starts to dewater to high temperature α gypsum slurries, now must carry out guarantor's mild heat to the material on vacuum belt machine, adopt and on vacuum belt machine, install stay-warm case additional and the way injecting high temperature air, adopt thermal oil directly to air heating, allow air themperature reach 100 DEG C ~ 200 DEG C, or directly pass into the heat smoke between temperature 100 DEG C ~ 200 DEG C; While Heat preservation, adopt pressurize measure, pressurize scope is 1 ~ 1.6MPa; αsemiwatergypsum controls between 97 DEG C ~ 100 DEG C by the temperature of charge of vacuum belt machine;
In order to ensure dehydration rate, can apply vibrations or apply mechanical pressure on vacuum hydro-extraction belt on material, vibrational acceleration is 10G(G is universal gravity constant), the pressure range of mechanical pressure is 1 ~ 2MPa; When the dehydration of α gypsum slurries is complete, moisture control, 0 ~ 20%, forms α gypsum purees.
(4) material transmission.The α gypsum purees of dewatering complete enters rotary conveyor, now must carry out guarantor's mild heat to the material on rotary conveyor, adopt and on rotary conveyor, install stay-warm case additional and the way injecting high temperature air, adopt thermal oil directly to air heating, allow air themperature reach 100 DEG C ~ 200 DEG C, or directly pass into the heat smoke between temperature 100 DEG C ~ 200 DEG C; While Heat preservation, adopt pressurize measure, pressurize scope is 1 ~ 1.6MPa; αsemiwatergypsum temperature of charge on a moving belt controls between 97 DEG C ~ 100 DEG C.
The stay-warm case installed additional on vacuum belt machine and on rotary conveyor can make an entirety.Need the belt transport speed controlling vacuum belt machine and rotary conveyor simultaneously, ensure that the Heat preservation stage residence time that material transmits in step (3) high temperature dehydration and step (4) material is less than 3 minutes, namely the dewatering time of αsemiwatergypsum material and delivery time sum are less than 3 minutes.
(5) the α gypsum purees of dewatering complete enters flash dryer.
Embodiment 3:
A solid-liquid separating method for α gypsum high temperature slurries, adopts following steps:
(1) crystallization first.With reference to embodiment 1.
(2) secondary crystal.With reference to embodiment 1.
(3) high temperature dehydration, solid-liquid separation.Discharge on vacuum belt machine by high temperature α gypsum slurries, now slurry temperature 110 DEG C ~ 150 DEG C, under vacuum hydro-extraction belt, the vacuum tightness of vacuum box is 0.1MPa;
Vacuum hydro-extraction belt starts to dewater to high temperature α gypsum slurries, now must carry out guarantor's mild heat to the material on vacuum belt machine, adopt and on vacuum belt machine, install stay-warm case additional and the way injecting high-temperature steam, allow vapor temperature reach 100 DEG C ~ 200 DEG C; While Heat preservation, adopt pressurize measure, pressurize scope is 1MPa; αsemiwatergypsum controls between 97 DEG C ~ 100 DEG C by the temperature of charge of vacuum belt machine;
In order to ensure dehydration rate, can apply vibrations or apply mechanical pressure on vacuum hydro-extraction belt on material, vibrational acceleration is 5G(G is universal gravity constant), the pressure range of mechanical pressure is 0.5MPa; When the dehydration of α gypsum slurries is complete, moisture control, 0 ~ 30%, forms α gypsum purees.
(4) material transmission.The α gypsum purees of dewatering complete enters rotary conveyor, now must carry out guarantor's mild heat to the material on rotary conveyor, adopt and on rotary conveyor, install stay-warm case additional and the way injecting high-temperature steam, the temperature of high-temperature steam is between 100 DEG C ~ 200 DEG C; Needing holding-zone to adopt pressurize measure, pressurize scope is 1MPa; αsemiwatergypsum temperature of charge on a moving belt controls between 97 DEG C ~ 100 DEG C;
The stay-warm case installed additional on vacuum belt machine and on rotary conveyor can make an entirety.Need the belt transport speed controlling vacuum belt machine and rotary conveyor simultaneously, ensure that the Heat preservation stage residence time that material transmits in step (3) high temperature dehydration and step (4) material is less than 4 minutes, namely the dewatering time of αsemiwatergypsum material and delivery time sum are less than 4 minutes.
(5) the α gypsum purees of dewatering complete enters flash dryer.
Claims (10)
1. a solid-liquid separating method for α gypsum high temperature slurries, comprises the steps:
(1) crystallization first: Gypsum Mine or desulfurated plaster or phosphogypsum are ground to form particle fineness and be distributed in dihydrate gypsum powder between 10 ~ 100 μm, dihydrate gypsum powder be mixed into water in mixing tank concentration 30 ~ 40% Gypsum slurry, and be heated to 30 DEG C ~ 100 DEG C, Gypsum slurry after being mixed enters in reactor through shurry pump, under temperature 90 DEG C ~ 150 DEG C, pressure 3.0 ~ 5.0MPa condition, and crystallization is first carried out under the effect of crystal modifier maleic anhydride, generate the α gypsum slurries of 98%;
(2) secondary crystal: on crystallization basis first, the α gypsum slurries generated enters in another reactor, under temperature 110 DEG C ~ 150 DEG C, pressure 3.0 ~ 4.0MPa condition, and carry out secondary crystal under the effect of crystal modifier maleic anhydride, generate the α gypsum slurries of 100%;
(3) high temperature dehydration, solid-liquid separation: high temperature α gypsum slurries is discharged on vacuum belt machine, now slurry temperature 110 DEG C ~ 150 DEG C, the vacuum box distributed under vacuum hydro-extraction belt forms a long vacuum pumping district, and its vacuum tightness is 0 ~ 1MPa;
The running of vacuum hydro-extraction belt carrying high temperature α gypsum slurries, starts to dewater to it, now must carry out guarantor's mild heat to the material on vacuum belt machine, lower the temperature to prevent material; Adopt and on vacuum belt machine, install stay-warm case additional and inject high-temperature steam or high temperature air or directly carry out guarantor's mild heat to the way that air heats, the temperature of high-temperature steam or high temperature air is between 100 DEG C ~ 260 DEG C; While Heat preservation, take pressurize measure or not pressurize, pressurize scope is 0 ~ 4MPa; αsemiwatergypsum controls between 50 DEG C ~ 260 DEG C at the temperature of charge by vacuum belt machine;
In order to ensure dehydration rate, can apply vibrations or apply mechanical pressure on vacuum hydro-extraction belt on material, vibrational acceleration is 0 ~ 10G, G is universal gravity constant, and the pressure range of mechanical pressure is 0 ~ 2MPa; When the dehydration of α gypsum slurries is complete, moisture control, 0 ~ 30%, forms a kind of α gypsum purees;
(4) material transmission: the α gypsum purees of dewatering complete enters rotary conveyor, now must carry out guarantor's mild heat to the material on rotary conveyor, lower the temperature to prevent material; Adopt and on rotary conveyor, install stay-warm case additional and inject high-temperature steam or high temperature air or directly carry out guarantor's mild heat to the way that air heats, the temperature of high-temperature steam or high temperature air is between 100 DEG C ~ 260 DEG C; While holding-zone heating, take pressurize measure or not pressurize, pressurize scope is 0 ~ 4MPa; αsemiwatergypsum temperature of charge on a moving belt controls between 50 DEG C ~ 260 DEG C;
While implementation step (3) high temperature dehydration and step (4) material transmit, need the belt transport speed controlling vacuum belt machine and rotary conveyor, ensure that material is less than 15 minutes in the Heat preservation stage residence time of step (3) and step (4), namely the dewatering time of αsemiwatergypsum material and delivery time sum are less than 15 minutes;
(5) the α gypsum purees of dewatering complete enters flash dryer.
2. the solid-liquid separating method of α gypsum high temperature slurries according to claim 1, is characterized in that: under the described vacuum hydro-extraction belt of step (3), the vacuum tightness of vacuum box is 0.075Mpa.
3. the solid-liquid separating method of α gypsum high temperature slurries according to claim 1 and 2, it is characterized in that: step (3) is described to be applied vibrations or apply mechanical pressure on material on vacuum hydro-extraction belt, vibrational acceleration is 0 ~ 10G, G is universal gravity constant, and the pressure range of mechanical pressure is 0 ~ 1Mpa.
4. the solid-liquid separating method of α gypsum high temperature slurries according to claim 1 and 2, it is characterized in that: step (3) is described to be applied vibrations or apply mechanical pressure on material on vacuum hydro-extraction belt, vibrational acceleration is 0 ~ 10G, G is universal gravity constant, and the pressure range of mechanical pressure is 1 ~ 2Mpa.
5. the solid-liquid separating method of α gypsum high temperature slurries according to claim 1 and 2, it is characterized in that: step (3) described employing on vacuum belt machine, install stay-warm case injection high temperature air additional and stay-warm case injection high temperature air is installed in step (4) described employing additional on rotary conveyor, adopt thermal oil directly to air heating, allow air themperature reach 100 DEG C ~ 200 DEG C, or directly pass into the heat smoke between temperature 100 ~ 200 DEG C; αsemiwatergypsum temperature of charge on a moving belt controls between 97 DEG C ~ 150 DEG C.
6. the solid-liquid separating method of α gypsum high temperature slurries according to claim 1 and 2, is characterized in that: the stay-warm case installed additional on step (3) and step (4) described vacuum belt machine and on rotary conveyor separately makes, unified heat supply.
7. the solid-liquid separating method of α gypsum high temperature slurries according to claim 1 and 2, it is characterized in that: the Heat preservation stage residence time that step (3) high temperature dehydration and step (4) material transmit controls within 5 minutes, namely the dewatering time of αsemiwatergypsum material and delivery time sum are less than 5 minutes.
8. the solid-liquid separating method of α gypsum high temperature slurries according to claim 7, it is characterized in that: the Heat preservation stage residence time that step (3) high temperature dehydration and step (4) material transmit controls within 3 minutes or within 4 minutes, namely the dewatering time of αsemiwatergypsum material and delivery time sum are less than 3 minutes or are less than 4 minutes.
9. the solid-liquid separating method of α gypsum high temperature slurries according to claim 1 and 2, it is characterized in that: the Heat preservation stage that step (3) high temperature dehydration and step (4) material transmit, while Heat preservation, take pressurize measure or not pressurize, pressurize scope is 0 ~ 1.6MPa.
10. the solid-liquid separating method of α gypsum high temperature slurries according to claim 1 and 2, is characterized in that: when the dehydration of step (3) described α gypsum slurries is complete, moisture control is 0 ~ 20%.
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| CN111559896A (en) * | 2020-05-08 | 2020-08-21 | 张延年 | Foaming phosphogypsum building block and preparation method thereof |
| CN113307521A (en) * | 2021-06-15 | 2021-08-27 | 鞍钢废钢资源(鞍山)有限公司 | Desulfurization gypsum regeneration device and regeneration method |
| WO2024013594A1 (en) * | 2022-07-15 | 2024-01-18 | Georgia-Pacific Gypsum Llc | Methods for calcining gypsum |
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| CN111559896A (en) * | 2020-05-08 | 2020-08-21 | 张延年 | Foaming phosphogypsum building block and preparation method thereof |
| CN113307521A (en) * | 2021-06-15 | 2021-08-27 | 鞍钢废钢资源(鞍山)有限公司 | Desulfurization gypsum regeneration device and regeneration method |
| CN113307521B (en) * | 2021-06-15 | 2024-02-09 | 鞍钢废钢资源(鞍山)有限公司 | Desulfurization gypsum regeneration device and regeneration method |
| WO2024013594A1 (en) * | 2022-07-15 | 2024-01-18 | Georgia-Pacific Gypsum Llc | Methods for calcining gypsum |
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| CN104310826B (en) | 2016-09-07 |
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