CN113149377A - Dewatered sludge curing agent, preparation method and use method - Google Patents
Dewatered sludge curing agent, preparation method and use method Download PDFInfo
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- CN113149377A CN113149377A CN202110215575.5A CN202110215575A CN113149377A CN 113149377 A CN113149377 A CN 113149377A CN 202110215575 A CN202110215575 A CN 202110215575A CN 113149377 A CN113149377 A CN 113149377A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
Abstract
A dewatered sludge curing agent, a preparation method and a use method belong to the technical field of environmental engineering, wherein the dewatered sludge curing agent comprises iron ore tailings, coal slag, phosphogypsum and travertine in the mass percentage of (1-3) to (1-4), and the preparation method comprises the following steps: the iron ore tailings, the coal slag and the phosphogypsum are respectively washed, dried, crushed and ground, the curbstone is also ground, and the processed curbstone is uniformly mixed according to the proportion. The use method of the dewatered sludge curing agent comprises the following steps: the dewatered sludge and the added dewatered sludge curing agent are added into a stirrer according to the mass ratio of 1: 0.04-0.08, the mixture is uniformly stirred, the compressive strength can reach 61-82.2 kPa after the mixture is stacked in a normal-temperature field for three days, and the pH value of the leachate is 7.05-8.4. The dewatered sludge curing agent adopts solid waste as a raw material, uses waste to treat waste, and has wide raw material source and low cost. The solidified dewatered sludge is used as soil for road filling.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to a dewatered sludge curing agent, a preparation method and a use method.
Background
The sludge is a byproduct discharged by domestic sewage and industrial sewage treated by a sewage treatment plant, silt, fiber, animal and plant residues and organic matters, heavy metal ions, viruses, germs, ova and colloid adsorbed on the animal and plant residues in the original sewage form a thick substance, and the toxic and harmful substances in the original sewage are remained in the dewatered sludge after the sewage treatment of the sewage treatment plant and need to be subjected to stabilization, reduction and harmless treatment.
In recent years, people have continuous and clear environmental risks and personal hazards caused by sludge, and desire to prevent the sewage and the sludge from being harmful and turn the harmful into the beneficial, improve the ecological environment and prevent the personal health from being harmed. For years, the standard of sludge treatment and disposal cost also shows a trend of increasing year by year, and the rapid development of the sludge industry is promoted. By 2019, the treatment capacity of municipal sewage treatment plants in China is improved to 1.77 billion cubic meters per day, and the accumulated treatment sewage amount is 532 billion cubic meters; according to the estimation of a future, the dry sludge generated is about 1232 ten thousand tons, and the dry sludge disposal quantity is about 1182 ten thousand tons. The sludge treatment technology mainly adopts energy drying and mechanical dehydration (including operated and constructed projects), and the energy drying accounts for a little higher than 31 percent. In addition to two treatment methods of cooling energy drying and mechanical dehydration, the occupation ratio of rapid reduction mode items such as chemical incineration is increased due to higher reduction pressure, so that methods for incinerating sludge slag and incinerating fly ash are buried; meanwhile, a method for landfill after the residual sludge of the sewage treatment plant is further dewatered by pressure filtration of a pressure filter is provided, and land utilization and huge investment of a landfill site are increased. Although a harmless and quantitative reduction measure, the method wastes land, energy and waste resources and does not accord with the principle of a resource-saving society.
For another example: in developing China, the advanced industrial and agricultural development and the improvement of the material life of people are achieved, the discharge amount of sewage and sludge is increased year after year, and the land and the capital investment consumed by the pressing filtration and incineration of the urban dewatered sludge with huge amount are huge; sewage leakage caused by landfill sites, ecological environment pollution caused by heavy metal ions such as Cu, Zu, Pb, Cd and the like, river and surface water pollution, absorption of heavy metal elements, viruses and disease sources of crop plant chains, and health hidden troubles brought to people after eating the crops. The sludge is not only residual dewatered sludge after sewage treatment in sewage treatment plants, but also waste soil produced in large quantities in water conservancy, environment and civil engineering. If the pollution of sludge is not properly treated, the harm of secondary pollution to the environment and human beings is huge! The method is a technical problem of harmless treatment and resource utilization of more generated various solid sludge.
At present, in the construction of a great number of expressways, first-level highways, second-level highways and rural villages constructed in China, huge and non-renewable sandstone and clay resources are required to be used as roadbed filling materials, and usually, the roadbed filling materials are used in modes of mountain-splitting stone mining and land-seeking soil borrowing. The construction mode of splitting mountain, picking stone and destroying land to build road is the silkworm food of land resource, ecological environment balance and natural resource, is undoubtedly the method of killing chicken and taking egg, does not accord with the national policy of building resource-saving society, and is subject to certain limitation or restriction in the situation that sand stone and land resource are in short supply in the east area with developed economy.
If the dewatered sludge, tailings, coal slag and other solid wastes can be recycled, the method is a scientific method for changing the chord and the tension if the dewatered sludge, the tailings, the coal slag and other solid wastes can be used as roadbed filling materials; the material can replace sandstone and clay to be used as roadbed filling material, thus reducing the consumption of nonrenewable sandstone and land resources, having important technical value for saving investment and optimizing roadbed engineering quality, and having obvious economic benefit, environmental benefit and social benefit.
Disclosure of Invention
The invention aims to solve the technical problem of further deepening the recycling problem of residual dewatered sludge after sewage treatment in a sewage treatment plant, and provides a dewatered sludge curing agent, a preparation method and a use method.
The curing agent adopts iron ore tailings, coal slag, phosphogypsum and travertine as raw materials, the raw materials are pretreated and then are prepared into the sludge curing agent by a preparation method of proportioning and mixing the raw materials, the sludge curing agent is added into dehydrated sludge according to the proportion of the sludge treatment amount, and the curing agent is used; the chemical functions of the sludge, the tailings and the solid waste, the mutual activity excitation of active ingredients and the solidification function of a curbstone curing agent are utilized to realize the solidification and stabilization of the dewatered sludge. The solidified dewatered sludge is used as roadbed filling material.
The dewatered sludge is derived from domestic sewage and industrial sewage introduced by a pipe network of a sewage treatment plant, the dewatered sludge with the water content lower than 85 percent is remained after the dewatering treatment by the processes of sludge-water separation, precipitation, filter pressing and the like, and the dewatered sludge contains a certain amount of SiO2、Al2O3And inorganic active ingredients such as CaO. The chemical components and the contents of the generated sludge are not the same due to different regional environments, industrial attributes, and living quality and habits of people in various sewage treatment plants.
The dewatered sludge curing agent adopts iron ore tailings as raw materials, and the iron ore tailings are divided into single-metal iron tailings and multi-metal iron tailings. The invention selects single-metal iron tailings and high-silicon single-metal iron tailings produced in Anshan, wherein the type of iron tailings is the type of iron tailings with the largest discharge yield, and the iron tailings belong to the type of ore dressing plants and also belong to the mines such as Nanfen, askew mountain, Anshan, Qida mountain, Bo Chang mountain, Daqu mountain, first Steel Large Stone river, Miyun, waterworks, Tai Steel Emkou, Tang Steel Stone ditch, rod mill mountain and the like.
The cinder selected by the dewatered sludge curing agent is the cinder discharged from industrial and civil boilers and other coal-fired equipment (mainly the cinder discharged by coal-fired power plants, smelting industry, chemical fertilizer plant steam-making furnaces, civil boilers in northern areas and the like for heat supply). At present, the waste residues are widely distributed in China, and the utilization amount is far from without large discharge amount. When the stack is discarded, sulfur-containing gas is also discharged to pollute the atmosphere and harm the environment.
The phosphogypsum selected by the dewatered sludge curing agent is industrial waste residue discharged by phosphoric acid or phosphorus industry and some detergent industries; the main component of the phosphogypsum is calcium sulfate dihydrate (CaSO)4·2H2O), and further contains various other impurities, such as grayish white impurities, and insoluble impurities such as quartz, undecomposed apatite, and insoluble P2O5Eutectic crystal P2O5Fluorides and phosphates and sulfates of fluorine, aluminum, magnesium. Soluble impurities; such as water-soluble P2O5Lower solubility fluorides and sulfates. In addition, the phosphogypsum also contains arsenic, copper, zinc, iron, manganese, lead, cadmium, mercury and radioactive elements which are all extremely trace, most of the elements are insoluble solids, and the hazard is negligible; fluoride, free phosphoric acid and P contained in phosphogypsum2O5And impurities such as phosphate are main factors causing environmental pollution of the phosphogypsum in the stockpiling process. The large amount of stacking of the phosphogypsum not only occupies land resources, but also causes pollution of atmosphere, water system and soil due to wind erosion and rain erosion, thus causing pollution of ecological environment and harm of human health.
The density of the phosphogypsum is 2.05g/cm3Volume weight of 0.85N/m3Is a plurality of groupsAnd (4) separating complex crystals. In general, 1 ton of phosphoric acid is produced by a wet method, and 4.5-5.5 tons of phosphogypsum are produced. The phosphogypsum is wet fine powder, 95 percent of particles are smaller than 0.2mm, the phosphogypsum is easy to agglomerate and agglomerate in air or normal temperature, drying and dry and hot environments, the free water content is 20-30 percent, the pH value is generally below 4.5, and the phosphogypsum is acidic.
The dewatered sludge curing agent of the invention selects the curbstone as the gelling agent, and the curbstone is a novel gelling material (patent application No. 02158190.8) jointly researched and developed by Qinghua university, China mining university and Beijing blue asset science and technology Limited company. Manufactured by the blue technologies ltd, the university of Jilin in 2004. The agglomerated stone product is a substitute of cement, and various performance indexes of the product, such as strength and the like, reach or exceed those of similar cement products.
The sludge curing agent comprises iron ore tailings, coal slag, phosphogypsum and curbstone, wherein the components are mixed according to the mass ratio of (1-3) to (1-4); wherein, the iron ore tailings adopt Anshan high-silicon type single-metal iron tailings, and SiO of the iron ore tailings2The silicon grade content is as high as 75-83%, and the silicon grade does not contain associated elements and SiO of coal slag2The silicon grade is 40-50%, and the granularity of iron ore tailings, coal slag, phosphogypsum and travertine is less than or equal to 100 meshes.
Wherein, the coal slag also comprises the following components by mass percent: al (Al)2O330～35％、Fe2O34-20%, CaO 1-5%, and small amount of magnesium, sulfur, carbon, etc. The mineral composition mainly comprises anorthite, quartz, mullite, magnetite, pyrite and a large amount of silicon-containing vitreous body (Al)2O3·2SiO2) And active SiO2Active Al2O3And a small amount of unfired coal, etc.; wherein, the main components of the phosphogypsum are as follows: calcium sulfate dihydrate (CaSO)4·2H2O), the content is generally more than 90 percent, and reaches the national first-grade gypsum standard; further contains Al2O30.18％、Fe2O30.045％、SiO2 9.45％、P2O51.18 percent; wherein the agglomerated stone is solid waste (particle) subjected to high-temperature processChemical blast furnace slag, powder fly ash and the like) as main raw materials, adding a special component (ligand) diagenetic agent, wherein the diagenetic agent is an aluminosilicic acid based hydraulic powdery cementing material prepared by grinding one or more than one of sodium hydrogen oxide sodium salt, calcium sulfate, sodium sulfate or sodium silicate.
The adopted iron ore tailings, coal cinder, phosphogypsum and concretion have different indexes because the mineral compositions, the harmful substance contents, the particle sizes and the hardness of the mineral compositions and the harmful substances produced in different batches in the same production area are different.
The preparation method of the dewatered sludge curing agent comprises the following steps:
step 1, respectively washing iron ore tailings, coal slag and phosphogypsum with water, and drying for 5-7 hours at the temperature of 100-105 ℃;
step 2, crushing the iron ore tailings, the coal slag and the phosphogypsum to below 1mm step by adopting a crusher, and then respectively grinding by adopting an edge runner mill, wherein the curbstone is also ground; the particle size of each raw material after crushing and grinding is less than or equal to 100 meshes;
and 3, uniformly mixing the treated iron ore tailings, the coal cinder, the phosphogypsum and the travertine according to the proportion of the dewatered sludge curing agent at normal temperature to form the dewatered sludge curing agent.
In the step 2 of the preparation method of the dewatered sludge curing agent, the iron ore tailings, the coal cinder and the phosphogypsum are crushed by a double-rotor crusher, and are ground by an LNJ-3600 type fine crushing wheel mill, and the curbstone is also ground.
In the step 2 of the preparation method of the dewatered sludge curing agent, the grinding time of the wheel mill for iron ore tailings, coal slag, phosphogypsum and concretion is 3-5 h, preferably 4 h.
The use method of the dewatered sludge curing agent comprises the following steps:
adding the dewatered sludge and a dewatered sludge curing agent into a 2LJ series double-shaft stirrer according to the mass ratio of 1: 0.04-0.08, stirring for 4-6 min at normal temperature, uniformly stirring to realize the solidification of the dewatered sludge, and using the solidified dewatered sludge as a filling material of a roadbed.
The used dehydrated sludge is the dehydrated sludge with the water content of less than 85 percent after the sewage treatment of a sewage treatment plant.
The used iron ore tailings are iron ore tailings which are discharged after valuable metal iron elements are selected and accumulated in a tailing pond by crushing and grinding iron ore raw ores under a specific process flow of an iron ore dressing plant.
The invention has the beneficial effects that:
1. the dewatered sludge curing agent is applied to curing treatment of residual dewatered sludge after sewage treatment of a sewage treatment plant. The method is characterized in that iron ore tailings, coal slag, phosphogypsum and travertine are used as raw materials of a curing agent, the iron ore tailings, the coal slag and the phosphogypsum are respectively washed and dried by water, and are respectively crushed step by step and then ground by a wheel mill (eliminating agglomeration of application substances caused by drying and thermal hardening), and the travertine is also ground and crushed finely; washing with water to remove the mud-like substances of harmful soluble salts present in the mineral substances, especially fluoride, free phosphoric acid, P contained in phosphogypsum2O5And phosphates and the like, which are environmentally polluting impurities. The adverse effect of a waste residue soluble salt subsequent hydration reaction solidification system is eliminated, the rate of a gelling reaction is enhanced, the full excitation of active oxides in a dewatered sludge solidification system is ensured, and the stability and the strength of the sludge solidification system are enhanced.
2. A solidification system of dewatered sludge solidifying agent, a physical treatment method for crushing and rolling iron ore tailings, coal cinder and ardealite, and rolling condensed material features that the iron ore tailings, coal cinder, ardealite and condensed stone are finely crushed and homogenized to increase the specific surface area of particles, resulting in surface damage and crack, the water molecules in sludge can easily invade into the surface damage crack of mineral particles, diluting and dissolving the alkaline active components in mineral particles, regulating the uniform excitation and activation of active components in solidification system of dewatered sludge, and the active oxides of silicon dioxide, aluminium oxide, calcium oxide, etc. in dewatered sludge particles are closely contacted with and fused to generate Ca (OH)2Under the action of chemical reaction with effective active gel produced by curdlan to produce aluminosilicate-based gel materialSo as to generate the whole gelation effect and promote the whole coagulation among the dehydrated sludge particles; heavy metal elements and pathogens originally existing in iron tailings, coal slag, phosphogypsum, agglomerated stone and dewatered sludge in a curing system are integrally solidified under the compacting and wrapping effects of integral particles due to the integral gelatinization effect of an aluminosilicate-based gel substance and the compacting physical effect of a road building machine before the cured sludge is used as a roadbed, so that the integral compactness of the dewatered sludge filling the roadbed is formed, the dewatered sludge is stably cured to form a firm water-insoluble base layer, and the integral strength of the filling roadbed is improved.
3. The curing agent completely adopts mineral solid wastes as raw materials, has wide and sufficient raw material sources and low cost, and utilizes the chemical components of the solid wastes and the super superposition effect among the solid wastes to endow the mixed filling material with the dilution dispersion effect and the activity excitation effect of active components to form a polycrystalline aggregate structure, so that the strength of the cured dewatered sludge is enhanced to become a road building roadbed filling material, and the curing agent is a new innovation for treating wastes with wastes, changing wastes into valuables and recycling wastes by using the waste minerals and the waste solid wastes.
4. Compared with the traditional road building soil method, the curing agent has good curing stability effect and simple preparation process, and the cured dewatered sludge does not cause secondary pollution to the environment.
5. The technology of the invention adheres to the policy principle of saving soil, saving land, utilizing waste and protecting environment, responds to the active action of building a resource-saving society, has obvious social, environmental and economic benefits, and is a sustainable development industry in the technical field of circular economy.
Detailed Description
Example 1
The dewatered sludge curing agent of the embodiment consists of iron ore tailings, coal slag, phosphogypsum and curbstone, and the components are mixed according to the mass ratio of 1: 1; wherein the iron ore tailings adopt single-metal iron ore tailings and SiO of the iron ore tailings2The silicon grade content is 78%, and the silicon grade does not contain accompanying elements generally; SiO of coal slag2The silicon grade is 43 percent, and the granularity of iron ore tailings, coal slag, phosphogypsum and travertine is less than or equal to 100 meshes.
The coal cinder also contains Al2O329％、Fe2O37 percent of CaO, 3 percent of CaO and a small amount of magnesium, sulfur, carbon and the like; wherein, the main component of the phosphogypsum is that the content of calcium sulfate dihydrate is 93 percent, and in addition, the phosphogypsum also contains various other impurities; wherein the curbstone is a curing agent; the rock-forming agent is formed by mixing one or more industrial wastes of slag, steel slag, fly ash, coal gangue, red mud and the like with a rock-forming agent, wherein the rock-forming agent is formed by grinding one or more substances of sodium hydroxide, calcium sulfate, sodium sulfate or sodium silicate. Is an aluminosilicate based colloidal material.
The preparation method of the dewatered sludge curing agent comprises the following steps:
step 1, respectively washing iron ore tailings, coal cinder and phosphogypsum with water, and drying for 6 hours at 100 ℃;
step 2, crushing the iron ore tailings, the coal cinder and the phosphogypsum to below 1mm step by using a double-rotor crusher, grinding by using an LNJ-3600 type fine crushing edge runner mill, grinding the agglomerated stone for 4 hours, and enabling the particle size of each crushed and ground material to be less than or equal to 100 meshes;
and 3, uniformly mixing the treated iron ore tailings, the coal cinder, the phosphogypsum and the travertine according to the proportion of the dewatered sludge curing agent at normal temperature to form the dewatered sludge curing agent.
The use method of the dewatered sludge curing agent comprises the following steps:
and (2) adding the dewatered sludge into a 2LJ series double-shaft stirrer, adding a dewatered sludge curing agent, wherein the mass ratio of the dewatered sludge to the dewatered sludge curing agent is 1: 0.04, starting the stirrer to stir for 4min at normal temperature, and uniformly stirring to realize the solidification of the dewatered sludge.
In the embodiment, after the solidified dewatered sludge is accumulated in a normal-temperature normal-pressure site for 3 days, a universal testing machine is adopted to measure the pit pressure strength of the dewatered sludge to be 61 kPa; the pH of the leachate was measured with a pH meter according to standard HJ557 — 2010 using horizontal shaking, pH 7.05.
Example 2
The dewatered sludge curing agent of the embodiment consists of iron ore tailings, coal slag, phosphogypsum and brewstone, and the components are mixed according to the mass ratio of 2: 1: 3; wherein the iron ore tailings adopt single-metal iron ore tailings and SiO of the iron ore tailings2The silicon grade content is 79.2%, and the silicon grade generally does not contain associated elements; SiO of coal slag2The content of silicon grade is 40%, and the granularity of iron ore tailings, coal slag, phosphogypsum and travertine is less than or equal to 100 meshes.
The coal cinder also contains Al2O332.3％、Fe2O316 percent of CaO, 2.2 percent of CaO and a small amount of magnesium, sulfur, carbon and the like; wherein, the main component of the phosphogypsum is calcium sulfate dihydrate with the content of 92.7 percent, and in addition, the phosphogypsum also contains various other impurities; wherein the curbstone is a curing agent; the silica-alumina-based cementing material is prepared by mixing one or more industrial wastes of slag, steel slag, fly ash, coal gangue, red mud and the like with a diagenetic agent, wherein the diagenetic agent is prepared by grinding one or more substances of sodium hydroxide, calcium sulfate, sodium sulfate or sodium silicate.
The preparation method of the dewatered sludge curing agent comprises the following steps:
step 1, respectively washing iron ore tailings, coal slag and phosphogypsum with water, and drying for 7 hours at 105 ℃;
step 2, respectively crushing the iron ore tailings, the coal slag and the phosphogypsum to below 1mm step by using a double-rotor crusher, then grinding by using an LNJ _3600 type fine crushing edge runner mill, grinding the curbstone, wherein the grinding time is 4 hours, and the particle size of each crushed and ground material is less than or equal to 100 meshes;
and 3, uniformly mixing the treated iron ore tailings, the coal cinder, the phosphogypsum and the curbstone according to the proportion of the dewatered sludge curing agent at normal temperature to form the dewatered sludge curing agent.
The use method of the dewatered sludge curing agent comprises the following steps:
and (2) adding the dewatered sludge into a 2LJ series double-shaft stirrer, adding a dewatered sludge curing agent, wherein the mass ratio of the dewatered sludge to the dewatered sludge curing agent is 1: 0.07, starting the stirrer to stir for 4min at normal temperature, and uniformly stirring to realize the solidification of the dewatered sludge.
In the embodiment, after the solidified dewatered sludge is accumulated in a normal-temperature normal-pressure site for 3 days, a universal testing machine is adopted to measure the compressive strength of the dewatered sludge to be 65 kPa; the pH of the leachate was measured by a pH meter using a horizontal shaking method according to standard HJ557 — 2010, and was 7.3.
Example 3
The dewatered sludge curing agent of the embodiment consists of iron ore tailings, coal slag, phosphogypsum and brewstone, and the components are mixed according to the mass ratio of 1: 3; wherein the iron ore tailings adopt single-metal iron ore tailings and SiO of the iron ore tailings2The silicon grade content is 77.1%, and the silicon grade generally does not contain associated elements; wherein, SiO of coal slag2The content of silicon grade is 42.4 percent, and the granularity of iron ore tailings, coal slag, phosphorus gypsum and agglomerated stone is less than or equal to 100 meshes.
The coal cinder also contains Al2O331.2％、Fe2O36.7 percent of CaO, 2.3 percent of CaO and a small amount of magnesium, sulfur, carbon and the like; wherein, the main component of the phosphogypsum is calcium sulfate dihydrate with the content of 91.3 percent, and in addition, the phosphogypsum also contains various other impurities; wherein the curbstone is a curing agent; the silica-alumina-based cementing material is formed by mixing one or more industrial wastes of slag, steel slag, fly ash, coal gangue, red mud and the like with a diagenetic agent, wherein the diagenetic agent is formed by grinding one or more substances of sodium hydroxide, sodium sulfate or sodium silicate, and is a silica-alumina-based cementing material.
The preparation method of the dewatered sludge curing agent comprises the following steps:
step 1, respectively washing iron ore tailings, coal cinder and phosphogypsum with water, and drying for 7 hours at 105 ℃;
step 2, crushing the iron ore tailings, the coal slag and the phosphogypsum to below 1mm by using a double-rotor crusher, grinding by using an LNJ-3600 type fine crushing edge runner mill respectively, grinding the curbstone for 4 hours, wherein the particle size of each crushed and ground material is less than or equal to 100 meshes;
and 3, uniformly mixing the treated iron ore tailings, the coal cinder, the phosphogypsum and the travertine according to the proportion of the dewatered sludge curing agent at normal temperature to form the dewatered sludge curing agent.
The use method of the dewatered sludge curing agent comprises the following steps:
and (2) adding the dewatered sludge into a 2LJ series double-shaft stirrer, adding a dewatered sludge curing agent, wherein the mass ratio of the dewatered sludge to the dewatered sludge curing agent is 1: 0.08, starting the stirrer for 6min at normal temperature, and uniformly stirring to realize the curing of the dewatered sludge.
In this example, after the solidified dewatered sludge was accumulated in a room at normal temperature and pressure for 3 days, the compressive strength of the sludge was measured by a universal testing machine to be 69.3 kPa: the pH of the leachate was measured with a pH meter according to standard HJ557 — 2010 using horizontal shaking, pH 8.2.
Example 4
The dewatered sludge curing agent of the embodiment consists of iron ore tailings, coal slag, phosphogypsum and brewstone, and the components are mixed according to the mass ratio of 1: 2: 4; wherein the iron ore tailings adopt single-metal iron ore tailings and SiO of the iron ore tailings2The silicon grade content is 81 percent, and the silicon grade does not contain accompanying elements generally; SiO of coal slag2The content of silicon grade is 48.8%, and the granularity of iron ore tailings, coal slag, phosphogypsum and concretion is less than or equal to 100 meshes.
The coal cinder also contains Al2O333.9％、Fe2O318.1 percent, CaO 3.8 percent and a small amount of magnesium, sulfur, carbon and the like; wherein the curbstone is a curing agent; the rock-forming agent is formed by mixing one or more industrial wastes of slag, steel slag, fly ash, coal gangue, red mud and the like with a rock-forming agent, wherein the rock-forming agent is formed by grinding one or more substances of sodium hydroxide, calcium sulfate, sodium sulfate or sodium silicate. Is an aluminosilicate-based cementing material.
The preparation method of the sludge curing agent comprises the following steps:
step 1, respectively washing iron ore tailings, coal slag and phosphogypsum with water, and drying at 105 ℃ for 6 hours;
step 2, respectively crushing the iron ore tailings, the coal slag and the phosphogypsum to below 1mm by using a double-rotor crusher, respectively grinding by using an LNJ-3600 type fine crushing edge runner mill, grinding the curbstone for 4 hours, wherein the particle size of each crushed and ground material is less than or equal to 100 meshes;
and 3, uniformly mixing the treated iron ore tailings, the coal cinder, the phosphogypsum and the travertine according to the proportion of the dewatered sludge curing agent at normal temperature to form the dewatered sludge curing agent.
The use method of the dewatered sludge curing agent comprises the following steps:
and (2) adding the dewatered sludge into a 2LJ series double-shaft stirrer, adding a dewatered sludge curing agent, wherein the mass ratio of the dewatered sludge to the dewatered sludge curing agent is 1: 0.04, starting the stirrer to stir for 5min at normal temperature, and uniformly stirring to realize the solidification of the dewatered sludge.
In the embodiment, after the solidified dewatered sludge is accumulated in a normal-temperature normal-pressure site for 3 days, a universal testing machine is adopted to measure the compressive strength of the dewatered sludge to be 82.2 kPa; the pH of the leachate was measured with a pH meter according to standard HJ557 — 2010 using horizontal shaking, pH 8.4.
Claims (4)
1. The preparation method of the dewatered sludge curing agent is characterized by comprising the following steps:
step 1, respectively cleaning iron ore tailings, coal cinder and phosphogypsum with water, and drying for 6-8 hours at 105-110 ℃; the mass ratio of the iron ore tailings to the coal slag to the phosphogypsum to the travertine is (1-3) to (1-4), wherein Si of the iron ore tailings2O3The grade of silicon is 75-83%, and the silicon does not contain associated elements generally; SiO of coal slag2The silicon grade content is 40-50%, and the silicon-containing material further comprises the following components in percentage by mass: al (Al)2O330～35％、FeO24-20% of CaO and 1-5% of CaO; the phosphogypsum comprises the following main components in percentage by mass: more than 90 percent of calcium sulfate dihydrate also contains various other impurities; the curbstone is a curing agent;
step 2, crushing the iron ore tailings, the coal slag and the phosphogypsum to below 1mm step by a crusher respectively, and then grinding the iron ore tailings, the coal slag and the phosphogypsum by an edge runner mill respectively, wherein the curbstone is also ground; the particle size of each material after crushing and grinding is less than or equal to 100 meshes;
and 3, uniformly mixing the treated iron ore tailings, the coal cinder, the phosphogypsum and the travertine according to the proportion of the dewatered sludge curing agent at normal temperature to form the dewatered sludge curing agent.
2. The method for producing a dewatered sludge curing agent according to claim 1, wherein; in the step 2, the iron ore tailings, the coal cinder and the phosphogypsum are crushed by a double-rotor crusher, and are ground by an LNJ-3600 fine crushing edge runner mill, and the curbstone is also ground by the fine crushing edge runner mill.
3. The method for preparing a dewatered sludge curing agent according to claim 1, characterized in that: in the step 2, the grinding time of the iron ore tailings, the coal slag, the phosphogypsum and the curbstone is 3-5 hours.
4. The method for using the dewatered sludge curing agent according to claim 1 is characterized by comprising the following steps: adding the dewatered sludge and a dewatered sludge curing agent into a 2LJ series double-shaft stirrer according to the mass ratio of 1: 0.04-0.08, stirring for 4-6 min at normal temperature, and uniformly stirring to realize the solidification of the dewatered sludge; the used dehydrated sludge is taken from dehydrated sludge with the water content of less than 85 percent after sewage treatment of a sewage treatment plant.
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| CN114226397A (en) * | 2021-12-13 | 2022-03-25 | 湖北聚海环境科技有限公司 | Equipment and method for preparing sludge curing agent based on phosphogypsum solid waste |
| CN116023111A (en) * | 2023-02-02 | 2023-04-28 | 重庆财信环境资源股份有限公司 | Full-solid waste sludge solidification and stabilization composite material and preparation method and application thereof |
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| CN116023111A (en) * | 2023-02-02 | 2023-04-28 | 重庆财信环境资源股份有限公司 | Full-solid waste sludge solidification and stabilization composite material and preparation method and application thereof |
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Application publication date: 20210723 |