CN104045298A - Preparation method of phosphogypsum-based sludge drying agent and application of preparation method in drying sludge - Google Patents

Preparation method of phosphogypsum-based sludge drying agent and application of preparation method in drying sludge Download PDF

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CN104045298A
CN104045298A CN201410168559.5A CN201410168559A CN104045298A CN 104045298 A CN104045298 A CN 104045298A CN 201410168559 A CN201410168559 A CN 201410168559A CN 104045298 A CN104045298 A CN 104045298A
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phosphogypsum
sludge
drying agent
slag
preparation
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CN104045298B (en
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黄绪泉
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Wuhan huzhenyu Environmental Technology Co., Ltd
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China Three Gorges University CTGU
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    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

The invention relates to a preparation method of a phosphogypsum-based sludge drying agent, comprising the following steps: using phosphogypsum as a basic raw material, adding blast furnace slag, steel slag and a clinker, stirring for 30-45 min to uniformly mix the above materials, and adding a chemical exciting agent to prepare a cementing material which is the phosphogypsum-based sludge drying agent. The phosphogypsum-based sludge drying agent is poured into dewatered sludge, and stirring is carried out for 3-10 min to prepare a mixture. the mixture is placed in a sealed container and is maintained at the temperature of 20 DEG C+/-1 DEG C and at humidity of being greater than or equal to 95% for 3-14 days, and moisture in the sludge is removed so as to further dry the sludge. The phosphogypsum-based sludge drying agent has advantages of large reduction extent of water content, short drying time and obvious drying effect; raw materials are mainly wastes; cost is low; energy consumption is low; there is no secondary pollution to the environment; and problems such as high water content of municipal sludge, high drying cost and the like can be solved.

Description

A kind of preparation method of phosphogypsum base sludge drying agent and the application on dewatered sludge thereof
Technical field
Patent of the present invention relates to a kind of preparation method of phosphogypsum base sludge drying agent, take phosphogypsum as basic material master, after doping slag, grog mix, add exciting agent and make quick mummification dewatered sludge, improve the air setting agent of sludge curing body intensity, and this drying agent is applied to slough the moisture in city sewage and sludge.
Background technology
Phosphogypsum is the industry byproduct with phosphorus ore raw material Wet-process phosphoric acid (WPPA), 1 ton of phosphoric acid produces phosphogypsum 5～6t (butt), the about 7t of quantity of goods produced, approximately 5,000 ten thousand tons of the annual generations in the whole nation, the semi-invariant of phosphogypsum is over 200,000,000 tons, all with the slag field form of storing up, dispose, all kinds of slags field land used reaches more than 18000 mu.In phosphogypsum, the impurity such as contained acid, fluorochemical causes the environmental pollution to water, soil in the process of storing up.Phosphogypsum comprehensive utilization of resources is the approach of living most that solves phosphogypsum problem of environmental pollution, but because residual phosphorus, fluorine in phosphogypsum can cause the excessive slow setting of cement and strength decreased; Make block strength not high; As brushing gypsum etc., because it is impure, be grey black and affect outward appearance; Be used as roadbase water tolerance and frost resistance poor; Ammonium sulfate processed and jointly producing cement investment are large, production cost is crossed the problems such as high, and these cause phosphogypsum recycling rate and added value all not high.
Blast-furnace slag is the refuse of discharging from blast furnace while smelting the pig iron.In smelting process, when furnace temperature reaches 1400～1600 ℃, add iron ore, fuel (coke) and the fusing assistant generation pyroreaction of blast furnace to generate the pig iron and blast-furnace slag, wherein blast-furnace slag is to be rich in SiO 2, Al 2o 3, the meltable mixture that forms of the chemical composition such as CaO, MgO, under chilling, there is higher lateral reactivity.Because of ore kind and smelting process different, blast-furnace slag quantity discharged is also different, normal conditions generate 1 ton of pig iron, produce 0.25～1.2 ton of blast-furnace slag.
At present the annual slag quantity discharged of Iron and Steel Enterprises in China is up to more than 6,000 ten thousand t, and along with the development of Iron And Steel Industry, the accumulating amount of various blast-furnace slags is increasing, and by 2010, China's blast-furnace slag quantity discharged was over 100,000,000 tons.If a large amount of blast-furnace slags is processed not in time and is fully utilized, there will be slag completely for suffering from, land occupation, fill up Gou Xi, silt river course up, welding polluting, affect sustainable development of iron and steel industry simultaneously.
The sludge quantity of the annual discharge of China sanitary sewage disposal factory is at present in solid content 20%, the annual mud ultimate production in the whole nation has broken through 3,000 ten thousand tons, annual growth is greater than 10%, follow China's treatment rate of domestic sewage to improve rapidly, sludge creation amount is by inevitably corresponding growth, between 2020～2025 years, annual mud ultimate production more will break through 6,000 ten thousand tons of high pointes by inference, and the problem of dissolving becomes increasingly conspicuous, anxious to be resolved.But due to municipal sludge after conventional thickening water ratio still up to 70%～85%.And with moisture percentage in sewage sludge, require≤40% (CJ/T289-2008) as brickmaking; Mix landfill and require moisture percentage in sewage sludge≤60% (CJ/T249-2007 with mud, GB/T23485-2009), maximum can only be mixed 8% mud, as landfill yard overburden soil water ratio < 45% (CJ/T249-2007, GB/T23485-2009); As moisture percentage in sewage sludge < 65% (CJ/T291-2008) for land reclamation, pH value 6.5～10; As agricultural moisture percentage in sewage sludge < 60% (CJ/T309-2009); As moisture percentage in sewage sludge < 40% (GB T23486-2009) for afforestation, therefore, too high moisture percentage in sewage sludge will inevitably directly affect the enforcement of sludge disposal and resource utilization, and effective mummification of mud is crucial.
Sludge drying technique mainly contains heat drying, biological dewatered and three kinds of modes of inorganic materials mummification at present, wherein with the many application of biological dewatered problem seldom, heat drying utilization is the most general, but its power consumption is high, used device is large, also lakebed mud is processed in inconvenience on the spot, inorganic materials mummification application is often that lime and cement etc. carry out mummification, but drying time is long, mud poor water resistance after mummification, in addition lime and manufacture of cement be need calcining, resource is also limited.
Summary of the invention
The object of the invention is to utilize slag, slag etc. to carry out modification to phosphogypsum excites and has prepared a kind of Novel sewage sludge drying agent, raw material is trade waste, with low cost, mummification is respond well, be conducive to dissolve a large amount of phosphogypsums that discard, heavy-polluted simultaneously, solve municipal sludge mummification problem.
The present invention realizes above-mentioned purpose like this:
A kind of preparation method of phosphogypsum base sludge drying agent, take phosphogypsum as basic material, after interpolation blast-furnace slag, slag, grog, stir 30～45min and make gelling material, after gelling material mixes, adding again chemical activator to be made into phosphogypsum base sludge drying agent.The component of phosphogypsum base sludge drying agent comprises phosphogypsum, blast-furnace slag, slag, grog, chemical activator, and by weight percentage, phosphogypsum is 40～60%, blast-furnace slag is 20～40%, slag 5～15%, grog 5～15%, chemical activator 0.5～1.5%.More preferably: by weight percentage, phosphogypsum is 40%, and blast-furnace slag is 40%, slag 10%, grog 10%, chemical activator 0.75%.
Phosphogypsum main component is CaSO 42H 2o, contains a small amount of P 2o 5and Fe 2o 3.After the little abrasive dust mill of cement experiment, specific surface area is greater than 750m 2/ kg, the volume scope in phosphogypsum base sludge drying agent is 40%～60%.Blast-furnace slag belongs to alkaline active material, and volume scope is 20%～40%.Grog is ordinary portland cement clinker, and volume scope is 10%～25%.After proportionally being weighed, above-mentioned raw materials mixes.Mud is city dehydrated sludge, and water ratio is between 70%～85%.
Phosphogypsum be take dihydrate gypsum crystal as main component, dihydrate gypsum does not have gelling property, and dihydrate gypsum solubleness is not high yet, must adopt active material to carry out modification to it excites, phosphogypsum is carried out to grinding pre-treatment, increase its specific surface area and fineness, be conducive to fully contact with chemical reaction complete with active material.The dihydrate gypsum crystal that CaO in active material can accelerate in phosphogypsum dissolves formation solion, in these solions and active material, aluminate and reaction generate and have high water suction, the needle-like aquation sulplo-aluminate of water tolerance and swelling capacity, when dewatered sludge by a large amount of free water in mud flocculent structure, interstitial water changes into hydrated product intercrystalline water, this needle-like hydrated product simultaneously generating has larger bulging force, further puncture mud flocculent structure, force encapsulated by structures moisture to flow out and participate in reaction, and by moisture in the compacted mud accelerating structure that expands, ooze out reaction and change into crystal water.
By product after quenching when blast-furnace slag is the smelting pig iron, chemical composition is with CaO, Al 2o 3, SiO 2with MgO etc. be main, because high-temperature quenching generates, most of heat energy is converted into chemical energy and is stored in slag, there is higher potential gelation activity, but under general condition slag can't hydration and hardening, only, in a small amount of exciting agent situation, it could lean on the chemical constitution of self to form gum material and have hydration and hardening activity.Grog is Portland clinker, and calcium sulfate in cement clinker and phosphogypsum all can fine activated slag activity.Chemical activator is sodium lignosulfonate (C 20h 24na 2o 10s 2), caoxalate (Ca 2c 2o 4), alunite (KAl (SO 4) 2.12H 2o), trimeric cyanamide (C 3h 6n 6), one or more in trolamine.Cement clinker and slag aquation generate calcium hydroxide, make Ca in slag glass volume grid 2+, AlO 4 5-, Al 3+and SiO 4 4-dissociate and enter solution, generate hydrated calcium silicate gel and drated calcium aluminate, wherein drated calcium aluminate also can generate with dihydrate gypsum crystal reaction in phosphogypsum the ettringite of water tolerance, under the so large volume of phosphogypsum, the ettringite generating can not change into single sulphur type hydrated calcium aluminate sulfate, has consumed a large amount of calcium hydroxide and slag activeconstituents, and accelerated reaction is further carried out, so repeatedly, the chemical activator of interpolation can fully excite slag activity.
Slag is the waste residue of STEELMAKING PRODUCTION, and main chemical constitution and blast-furnace slag are similar, just active Fe 2o 3higher with free CaO content, at CaO and CaSO 4under effect, can generate hydrated calcium silicate gel and ettringite, wherein Fe 2o 3also can participate in generating ettringite, its potential hydration and hardening activity is excited thus.Therefore, grog and phosphogypsum all can promote slag activity excitation.
According to X ray diffracting spectrum, the main component of typical urban mud is alpha-quartz, next is gismondine, paragonite, albite, clinochlore etc., easily there is decomposition reaction in albite and clinochlore, decompose the silicon, the aluminium isoreactivity material that produce and also may participate in the formation reaction of mummification hydrated product under alkaline condition.
Mud mainly forms to have flocculence, tiny solid hydrophilic particle gluey, highly dense and large quantity of moisture, and its water ratio is high, specific surface causes greatly its moisture to be difficult to remove.According to moisture distribution structure, mud water content mainly with surface adsorption water, interstitial water, capillary in conjunction with four classes such as water and internal junction Heshuis, wherein mud concentrated and dehydration in earlier stage can be removed most of interstitial water and planar water, but capillary is removed to extreme difference in conjunction with water and internal junction Heshui.Capillary is very strong in conjunction with water and mud granule bonding force, accounts for sludge water content 20% left and right; Internal junction Heshui is mainly the moisture in microorganism cells body in mud, accounts for sludge water content 5%～7%, and this moisture and solid bond are also very tight, wants effectively to remove this two classes moisture, must destroy its internal structure.
Municipal sludge grain graininess is little, containing organic matter, the high difficult dehydration of water content, have structure a large amount of and the cotton-shaped colloidal solid formation that water avidity is very strong.Phosphogypsum base sludge drying agent aquation generates in early days strong basicity calcium hydroxide and can kill mud germ and reduce stench with the amount of heat discharging; Drying agent also can promote mud granule to decompose silicon, the aluminium isoreactivity material producing, and is conducive to the increase of mummification hydrated product quantity; The acicular calcium aluminite content in what is more important generation hydrated product with high crystal water, high-expansion energy is higher, has destroyed water transform in the intrinsic flocculent structure of mud and mud.Aquation forms gum material parcel that needle-like ettringite, hydrated calcium silicate gel etc. generate, interts between adjacent mud granule, expands compacted and makes sludge drying.
2CaO·SiO 2+mH 2O→xCaO·SiO 2·yH 2O+(2-x)Ca(OH) 2
3CaO·SiO 2+mH 2O→xCaO·SiO 2·yH 2O+(3-x)Ca(OH) 2
3CaOAl 2o 3+ 3 (CaSO 42H 2o)+26H 2o → 3CaOAl 2o 33CaSO 432H 2o (ettringite)
4CaO·Al 2O 3·Fe 2O 3+3(CaSO 4·2H 2O)+2Ca(OH) 2+50H 2O→3CaO(Al 2O 3·Fe 2O 3)
3CaSO 432H 2o (ettringite)
The present invention also provides the application of a kind of phosphogypsum base sludge drying agent on dewatered sludge, described gelling material is poured in dewatered sludge, stir 3～10min, make mixture, this mixture is placed in to sealed vessel, in temperature, be maintenance 3～14 days under 20 ℃ ± 1 ℃, humidity >=95% curing condition, slough the moisture in mud.Described dewatered sludge to be city sewage and sludge make after dehydration water ratio is 70～88% mud.
Advantage of the present invention: (1) phosphogypsum base sludge drying agent is compared with cement, lime, water ratio reduction amplitude is large, the time is short, mummification successful; (2) raw material is mainly waste, the little power consumption of cost is low, to environment non-secondary pollution; (3) improved the utilization ratio of phosphogypsum and blast-furnace slag, for phosphogypsum recycling provides a new way.(4) solved that municipal sludge water ratio is high, mummification high in cost of production problem.(5) technique of the present invention is simple, easy to operate, is applicable to large industrial applications.
Accompanying drawing explanation
Fig. 1 packs mud into;
Fig. 2 is for adding drying agent to be uniformly mixed;
Dewatered sludge after Fig. 3 stirs;
Fig. 4 mixes dewatered sludge and is pressed into brick.
Embodiment:
Embodiment 1:
Phosphogypsum, slag, slag after 40:33:15:12 mixes by mass percentage with grog, stir 30min and make gelling material, toward this gelling material, add sodium lignosulfonate (C 20h 24na 2o 10s 2), make phosphogypsum base sludge drying agent, wherein sodium lignosulfonate (C 20h 24na 2o 10s 2) account for 0.75% of gelling material total mass.Described phosphogypsum actual measurement specific surface area is 765.2m 2/ kg.
This experiment is sludge drying experiment.The original water ratio of dewatered sludge is 81.4%, prepare according to the above ratio gelling material, by 15% of dewatered sludge total mass, take this gelling material, pouring glue sand agitator into mixes after stirring 3min, take out dewatered sludge and be placed in sealed vessel, under 20 ℃ ± 1 ℃ of temperature, humidity >=95% normal curing condition, carry out maintenance, difference sampling and measuring moisture percentage in sewage sludge during to the different length of time.Meanwhile, get part original state mud, be placed in another container, maintenance under normal curing condition, also distinguishes sampling and measuring original state moisture percentage in sewage sludge, to analyze the variation of primary sludge water ratio with the length of time while arriving the identical length of time.Water ratio sample is all got 2 parallel sample tests at every turn, and result is got its mean value.
The length of time 3d 7d 14d
Dewatered sludge water ratio (%) 68.4 55.4 34.7
Original state moisture percentage in sewage sludge (%) 81.2 80.9 81.2
Embodiment 2:
Phosphogypsum, slag, slag after 60:20:5:15 mixes by mass percentage with grog, stir 30min and make gelling material, toward this gelling material, add caoxalate (Ca 2c 2o 4), make phosphogypsum base sludge drying agent, its calcium oxalate crystal growth in healthy (Ca 2c 2o 4) account for 1.0% of gelling material total mass.Described phosphogypsum actual measurement specific surface area is 800.5m 2/ kg.
This experiment is sludge drying experiment.Dewatered sludge original state water ratio mean value is 77.2%, prepare according to the above ratio gelling material, by 15% of dewatered sludge total mass, take this gelling material, pouring glue sand agitator into mixes after stirring 3min, take out dewatered sludge and be placed in sealed vessel, under 20 ℃ ± 1 ℃ of temperature, humidity >=95% normal curing condition, carry out maintenance, difference sampling and measuring moisture percentage in sewage sludge during to the different length of time.Meanwhile, get part original state mud, be placed in another container, maintenance under normal curing condition, also distinguishes sampling and measuring original state moisture percentage in sewage sludge, to analyze the variation of primary sludge water ratio with the length of time while arriving the identical length of time.Water ratio sample is all got 2 parallel sample tests at every turn, and result is got its mean value.
The length of time 3d 7d 14d
Dewatered sludge water ratio (%) 57.7 48.2 31.1
Original state moisture percentage in sewage sludge (%) 77.0 76.9 77.4
Embodiment 3:
Phosphogypsum, slag, slag after 50:30:10:10 mixes by mass percentage with grog, stir 30min and make gelling material, toward this gelling material, add alunite (KAl (SO 4) 2.12H 2o), make phosphogypsum base sludge drying agent, wherein alunite (KAl (SO 4) 2.12H 2o) account for 0.5% of gelling material total mass.Described phosphogypsum actual measurement specific surface area is 777.3m 2/ kg.
This experiment is sludge drying experiment.Dewatered sludge original state water ratio mean value is 76.0%, prepare according to the above ratio gelling material, by 15% of dewatered sludge total mass, take this gelling material, pouring glue sand agitator into mixes after stirring 3min, take out dewatered sludge and be placed in sealed vessel, under 20 ℃ ± 1 ℃ of temperature, humidity >=95% normal curing condition, carry out maintenance, difference sampling and measuring moisture percentage in sewage sludge during to the different length of time.Meanwhile, get part original state mud, be placed in another container, maintenance under normal curing condition, also distinguishes sampling and measuring original state moisture percentage in sewage sludge, to analyze the variation of primary sludge water ratio with the length of time while arriving the identical length of time.Water ratio sample is all got 2 parallel sample tests at every turn, and result is got its mean value.
The length of time 3d 7d 14d
Dewatered sludge water ratio (%) 58.1 49.7 33.3
Original state moisture percentage in sewage sludge (%) 75.8 76.0 76.1
Embodiment 4:
Phosphogypsum, slag, slag after 45:35:7:13 mixes by mass percentage with grog, stir 30min and make gelling material, toward this gelling material, add trimeric cyanamide (C 3h 6n 6), make phosphogypsum base sludge drying agent, wherein trimeric cyanamide (C 3h 6n 6) account for 1.25% of gelling material total mass.Described phosphogypsum actual measurement specific surface area is 811.7m 2/ kg.
This experiment is sludge drying experiment.Dewatered sludge original state water ratio mean value is 73.2%, prepare according to the above ratio gelling material, by 15% of dewatered sludge total mass, take this gelling material, pouring glue sand agitator into mixes after stirring 3min, take out dewatered sludge and be placed in sealed vessel, under 20 ℃ ± 1 ℃ of temperature, humidity >=95% normal curing condition, carry out maintenance, difference sampling and measuring moisture percentage in sewage sludge during to the different length of time.Meanwhile, get part original state mud, be placed in another container, maintenance under normal curing condition, also distinguishes sampling and measuring original state moisture percentage in sewage sludge, to analyze the variation of primary sludge water ratio with the length of time while arriving the identical length of time.Water ratio sample is all got 2 parallel sample tests at every turn, and result is got its mean value.
The length of time 3d 7d 14d
Dewatered sludge water ratio (%) 51.5 44.1 30.9
Original state moisture percentage in sewage sludge (%) 73.3 72.8 73.4
Embodiment 5:
Phosphogypsum, slag, slag are after 53:27:12:8 mixes by mass percentage with grog, stir 30min and make gelling material, toward this gelling material, add trolamine, make phosphogypsum base sludge drying agent, wherein trolamine accounts for 1.5% of gelling material total mass.Described phosphogypsum actual measurement specific surface area is 792.8m 2/ kg.
This experiment is sludge drying experiment.Dewatered sludge original state water ratio mean value is 73.6%, prepare according to the above ratio gelling material, by 15% of dewatered sludge total mass, take this gelling material, pouring glue sand agitator into mixes after stirring 3min, take out dewatered sludge and be placed in sealed vessel, under 20 ℃ ± 1 ℃ of temperature, humidity >=95% normal curing condition, carry out maintenance, difference sampling and measuring moisture percentage in sewage sludge during to the different length of time.Meanwhile, get part original state mud, be placed in another container, maintenance under normal curing condition, also distinguishes sampling and measuring original state moisture percentage in sewage sludge, to analyze the variation of primary sludge water ratio with the length of time while arriving the identical length of time.Water ratio sample is all got 2 parallel sample tests at every turn, and result is got its mean value.
The length of time 3d 7d 14d
Dewatered sludge water ratio (%) 57.4 49.9 32.2
Original state moisture percentage in sewage sludge (%) 73.2 74.0 73.6
Embodiment 6:
Phosphogypsum, slag, slag after 55:35:5:5 mixes by mass percentage with grog, stir 30min and make gelling material, toward this gelling material, add sodium lignosulfonate (C 20h 24na 2o 10s 2) and alunite (KAl (SO 4) 2.12H 2o), make phosphogypsum base sludge drying agent, wherein sodium lignosulfonate (C 20h 24na 2o 10s 2) and alunite (KAl (SO 4) 2.12H 2o) account for 1.5% of gelling material total mass, sodium lignosulfonate (C 20h 24na 2o 10s 2) and alunite (KAl (SO 4) 2.12H 2o) mass ratio is 1:5.Described phosphogypsum actual measurement specific surface area is 765.4m 2/ kg.
This experiment is sludge drying experiment.Dewatered sludge original state water ratio mean value is 85.1%, prepare according to the above ratio gelling material, by 15% of dewatered sludge total mass, take this gelling material, pouring glue sand agitator into mixes after stirring 3min, take out dewatered sludge and be placed in sealed vessel, under 20 ℃ ± 1 ℃ of temperature, humidity >=95% normal curing condition, carry out maintenance, difference sampling and measuring moisture percentage in sewage sludge during to the different length of time.Meanwhile, get part original state mud, be placed in another container, maintenance under normal curing condition, also distinguishes sampling and measuring original state moisture percentage in sewage sludge, to analyze the variation of primary sludge water ratio with the length of time while arriving the identical length of time.Water ratio sample is all got 2 parallel sample tests at every turn, and result is got its mean value.
The length of time 3d 7d 14d
Dewatered sludge water ratio (%) 68.5 51.2 33.1
Original state moisture percentage in sewage sludge (%) 84.8 85.6 85.0
Embodiment 7:
Phosphogypsum, slag, slag after 40:40:10:10 mixes by mass percentage with grog, stir 30min and make gelling material, toward this gelling material, add caoxalate (Ca 2c 2o 4) and trimeric cyanamide (C 3h 6n 6), make phosphogypsum base sludge drying agent, its calcium oxalate crystal growth in healthy (Ca 2c 2o 4) and trimeric cyanamide (C 3h 6n 6) account for 0.75% of gelling material total mass, caoxalate (Ca 2c 2o 4) and trimeric cyanamide (C 3h 6n 6) mass ratio be 1:3.Described phosphogypsum actual measurement specific surface area is 780.8m 2/ kg.
This experiment is sludge drying experiment.Dewatered sludge original state water ratio is 80.3%, prepare according to the above ratio gelling material, by 15% of dewatered sludge total mass, take this gelling material, pouring glue sand agitator into mixes after stirring 3min, take out dewatered sludge and be placed in sealed vessel, under 20 ℃ ± 1 ℃ of temperature, humidity >=95% normal curing condition, carry out maintenance, difference sampling and measuring moisture percentage in sewage sludge during to the different length of time.Meanwhile, get part original state mud, be placed in another container, maintenance under normal curing condition, also distinguishes sampling and measuring original state moisture percentage in sewage sludge, to analyze the variation of primary sludge water ratio with the length of time while arriving the identical length of time.Water ratio sample is all got 2 parallel sample tests at every turn, and result is got its mean value.
The length of time 3d 7d 14d
Dewatered sludge water ratio (%) 61.1 52.2 28.5
Original state moisture percentage in sewage sludge (%) 80.6 80.4 79.8
Embodiment 8:
Phosphogypsum, slag, slag after 57:27:6:10 mixes by mass percentage with grog, stir 30min and make gelling material, toward this gelling material, add caoxalate (Ca 2c 2o 4) and trolamine, make phosphogypsum base sludge drying agent, its calcium oxalate crystal growth in healthy (Ca 2c 2o 4) and trolamine account for 1.2% of gelling material total mass, caoxalate (Ca 2c 2o 4) and the mass ratio of trolamine be 1:5.Described phosphogypsum actual measurement specific surface area is 812.7m 2/ kg.
This experiment is sludge drying experiment.Dewatered sludge original state water ratio is 84.0%, prepare according to the above ratio gelling material, by 15% of dewatered sludge total mass, take this gelling material, pouring glue sand agitator into mixes after stirring 3min, take out dewatered sludge and be placed in sealed vessel, under 20 ℃ ± 1 ℃ of temperature, humidity >=95% normal curing condition, carry out maintenance, difference sampling and measuring moisture percentage in sewage sludge during to the different length of time.Meanwhile, get part original state mud, be placed in another container, maintenance under normal curing condition, also distinguishes sampling and measuring original state moisture percentage in sewage sludge, to analyze the variation of primary sludge water ratio with the length of time while arriving the identical length of time.Water ratio sample is all got 2 parallel sample tests at every turn, and result is got its mean value.
The length of time 3d 7d 14d
Dewatered sludge water ratio (%) 60.0 50.8 36.9
Original state moisture percentage in sewage sludge (%) 84.0 83.6 84.4
Dewatered sludge application:
1, dewatered sludge is as refuse landfill day overburden soil
One deck rubbish is often filled out in refuse landfill will cover 20～25cm soil, often be called a day overburden soil, conventionally the ratio of day overburden soil and garbage bulk is 1:4 or 1:3, traditional landfill yard adopts natural clay as overburden soil, there are a large amount of land occupation resource problems, adopt dewatered sludge to substitute natural clay and do a day overburden soil, can not only solve nature soil and take problem, and can provide outlet for the processing of mud.
The mummification mud (being called for short dewatered sludge below) after 14 days of learning from else's experience, water ratio is 34.8%, and according to falling head permeability test in Standard for test methods of earthworks (GB/T50123-1999), testing this dewatered sludge permeability coefficient is 3.2 * 10 -8cm/s, lower than 1.0 * 10 -7cm/s, meets as landfill yard overburden soil water ratio and permeability coefficient requirement, can substitute natural clay as refuse landfill day overburden soil completely.
2, dewatered sludge is as city trees and shrubs cultivated soil
Construction of city afforestation needs soil for a large amount of gardens, and main leaning on from surrounding region of city outward transport mode, cultivates with soil dewatered sludge as gardens, has both solved dewatered sludge problem of outlet, has reduced again urban afforestation transportation cost.
The mummification mud (being called for short dewatered sludge below) after 14 days of learning from else's experience, water ratio is 31.2%, pH value 8.2, outward appearance is more fluffy without obvious stink, organic content 30.2% after interpolation part organic waste residues, according to urban wastewater treatment firm sludge disposal for afforestation in shale (GB T23486-2009) test primary sludge and dewatered sludge heavy metal ion change, after sludge drying, heavy metal ion leaching concentration significantly reduces.Meet the native requirement of afforestation, can not damage environment.
3, dewatered sludge produced sintering brick
The mummification mud (being called for short dewatered sludge below) after 14 days of learning from else's experience, water ratio is 35.1%, drying broken clay with process is uniformly mixed according to 1:4 mass ratio, after mixing, water ratio is 14.2%, mixture being entered to internal diameter is 240mm * 115mm * 53mm stock mould again, compression moulding postposition enters room temperature ageing 24h, then be placed in cooling coming out of the stove after 950 ℃ of retort furnace sintering 2.2h, brick body is without cracking and distortion, according to fired common brick (GB5101-2003), carry out intensity test, its ultimate compression strength mean value is 17.8MPa, meet the ultimate compression strength requirement of strength grade MU15, visual appearance passed examination.

Claims (8)

1. the preparation method of a phosphogypsum base sludge drying agent, it is characterized in that: take phosphogypsum as basic material, after adding blast-furnace slag, slag, grog, stir 30 ~ 45min, make mix, in this mix, add chemical activator to be made into gelling material again, this gelling material is phosphogypsum base sludge drying agent.
2. the preparation method of phosphogypsum base sludge drying agent according to claim 1, is characterized in that: in mix, by weight percentage, phosphogypsum is 40 ~ 60%, and blast-furnace slag is 20 ~ 40%, slag 5 ~ 15%, grog 5 ~ 15%; Wherein, chemical activator accounts for 0.5 ~ 1.5% of mix gross weight.
3. the preparation method of phosphogypsum base sludge drying agent according to claim 2, is characterized in that: in mix, by weight percentage, phosphogypsum is 40%, and blast-furnace slag is 40%, slag 10%, grog 10%; Wherein, chemical activator accounts for 0.75% of mix gross weight.
4. the preparation method of phosphogypsum base sludge drying agent according to claim 1, is characterized in that: described phosphogypsum size is 0.1 ~ 10 μ m, and specific surface area is greater than 750m 2/ kg.
5. the preparation method of phosphogypsum base sludge drying agent according to claim 1, is characterized in that: described blast-furnace slag is the by product after quenching while smelting the pig iron, and its composition mainly comprises CaO, Al 2o 3, SiO 2, MgO.
6. the preparation method of phosphogypsum base sludge drying agent according to claim 1, is characterized in that: the waste residue that described slag is STEELMAKING PRODUCTION, its composition mainly comprises Fe 2o 3, CaO.
7. the preparation method of phosphogypsum base sludge drying agent according to claim 1, is characterized in that: grog is Portland clinker, and chemical activator is sodium lignosulfonate (C 20h 24na 2o 10s 2), caoxalate (Ca 2c 2o 4), alunite (KAl (SO 4) 212H 2o), trimeric cyanamide (C 3h 6n 6), one or more in trolamine.
8. the phosphogypsum base sludge drying agent application on dewatered sludge.
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CN104649533A (en) * 2015-02-05 2015-05-27 宇星科技发展(深圳)有限公司 Compound conditioning and deep dewatering method of sludge
CN104649533B (en) * 2015-02-05 2021-03-26 宇星科技发展(深圳)有限公司 Compound conditioning and deep dewatering method for sludge
CN105036516A (en) * 2015-07-03 2015-11-11 天津霍普环保科技有限公司 Preparation method of industrial waste residue-based sludge drying agent
CN105271630A (en) * 2015-09-24 2016-01-27 葛洲坝中固科技股份有限公司 Energy-saving and environment-protection sludge modified material and preparation method thereof
CN107699251A (en) * 2017-10-31 2018-02-16 三峡大学 The fluorite cream base passivator and preparation method of a kind of heavy metal pollution agricultural land soil
CN109293190A (en) * 2018-11-02 2019-02-01 南华大学 A kind of processing method of oily sludge
CN110590121A (en) * 2019-08-30 2019-12-20 中山大学 Sludge dehydrating agent and sludge dehydrating method
CN111253045A (en) * 2020-02-01 2020-06-09 肇庆泉兴生态科技有限公司 Steel slag-based town sludge dehydrating agent and dehydrating method thereof
CN111499324A (en) * 2020-04-02 2020-08-07 湖北益通建设股份有限公司 Low-toxicity phosphogypsum cemented macadam material and application thereof in road base course
CN112125547A (en) * 2020-09-09 2020-12-25 四川绵筑新材料有限公司 Preparation method of phosphogypsum-based composite cementing material
CN112374711A (en) * 2020-11-30 2021-02-19 肇庆市武大环境技术研究院 Sludge curing agent based on industrial waste residues and application method thereof

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