WO2021004192A1 - 一种利用电镀污泥烧结建筑陶粒的制备方法 - Google Patents

一种利用电镀污泥烧结建筑陶粒的制备方法 Download PDF

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WO2021004192A1
WO2021004192A1 PCT/CN2020/093459 CN2020093459W WO2021004192A1 WO 2021004192 A1 WO2021004192 A1 WO 2021004192A1 CN 2020093459 W CN2020093459 W CN 2020093459W WO 2021004192 A1 WO2021004192 A1 WO 2021004192A1
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ceramsite
sludge
electroplating sludge
electroplating
aluminum
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French (fr)
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孙英杰
景奕鸣
赵建伟
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青岛理工大学
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    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/027—Lightweight materials
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6562—Heating rate
    • C—CHEMISTRY; METALLURGY
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567—Treatment time

Definitions

  • the invention relates to the technical field of hazardous waste recycling and sludge waste utilization, in particular to a method for preparing electroplating sludge sintered ceramsite.
  • Electroplating sludge refers to the by-products produced in the process of electroplating wastewater treatment. Since electroplating wastewater contains various strong acids, strong alkalis and metal solutions, even cyanide, chromic anhydride and other toxic and harmful chemicals, electroplating sludge is copper and chromium. , Nickel and other heavy metal oxides mainly precipitates. The annual output of electroplating sludge in my country is millions of tons, and its main pollutants are various heavy metals. Improper disposal will cause secondary pollution to the environment. Electroplating sludge is a very clear and toxic solid waste in the national hazardous waste list. Today, the common disposal method of electroplating sludge is landfill.
  • Mica sand is the tailings of gold mines.
  • the semi-living elements of gold mines include copper, zinc, lead, antimony, arsenic, etc. If the tailings are not handled properly, the tailings powder or the toxic and harmful substances in it will easily diffuse into the atmosphere. Water and soil cause environmental pollution; as solid waste, aluminum sludge in water supply plants also has problems such as great harm and difficult disposal.
  • ceramsite As a kind of lightweight aggregate for construction, ceramsite has the characteristics of light weight, high strength, low water absorption, heat preservation, heat insulation, earthquake resistance and fire resistance, so it has received great attention. It has a wide range of uses and can replace ordinary sand and gravel to configure lightweight aggregate concrete.
  • ceramsite is mainly made of clay and shale ceramsite, and most of the sources of clay raw materials are from cultivated land. Shale ceramsite materials must be taken from mountains to destroy the ecological environment, which is not in line with the sustainable development strategy. Therefore, it is necessary to find new ceramsite manufacturing materials and reduce the cost of raw materials as much as possible, reduce the amount of additives such as binders and expansion agents, so as to improve the economic and social benefits of ceramsite.
  • the purpose of the present invention is to provide a method for preparing electroplating sludge sintered ceramsite.
  • Electroplating sludge is used as the raw material of sintered ceramsite.
  • the heavy metal elements such as chromium can be solidified in it.
  • its leaching concentration is greatly reduced to achieve harmless disposal; on the other hand, it can replace some natural materials such as clay and shale, saving the ever-decreasing usage of natural clay raw materials, and achieving harmless disposal.
  • purpose make it a building material product with practical application value and a new way to use this type of solid waste as a resource, while protecting the environment, saving natural resources, and achieving good economic and social benefits.
  • the purpose of the present invention is to provide a method for preparing electroplating sludge sintered ceramsite and the ceramsite prepared by the preparation method, and the ceramsite is used in the construction field.
  • a preparation method of electroplating sludge sintered ceramsite includes the following steps:
  • step (3) Add 3% to 5% of sodium silicate solution as a ceramsite binder to the ceramsite raw material obtained in step (2), and mix and granulate to obtain raw ceramsite.
  • step (3) Put the raw ceramsite obtained in step (3) into a muffle furnace at a heating rate of 10°C/min, first raise it to 105°C for drying for 1 hour, then raise the temperature to 500°C for preheating for 15 minutes, and finally raise the temperature to 1200 Sintering at °C for 25min.
  • the mass percentages of the electroplating sludge, mica sand, and aluminum sludge are 10%-30% of electroplating sludge, 50%-70% of mica sand, and 20% of aluminum sludge.
  • the sum of the mass percentages of the three raw materials is 100%.
  • the mass percentages of the electroplating sludge, mica sand, and aluminum sludge are respectively 10%-25% of electroplating sludge, 55%-70% of mica sand, and 20% of aluminum sludge.
  • the sum of the mass percentages of the three raw materials is 100%.
  • the mass percentages of electroplating sludge, mica sand, and aluminum sludge are 15%-25% of electroplating sludge, 55%-65% of mica sand, and 20% of aluminum sludge.
  • the sum of the mass percentages of the three raw materials is 100%.
  • the mass percentage combination of electroplating sludge, mica sand, and aluminum sludge can be: electroplating sludge 10%, mica sand 70%, aluminum sludge 20%; electroplating sludge 25%, Mica sand 55%, aluminum sludge 20%; or electroplating sludge 30%, mica sand 50%, and aluminum sludge 20%.
  • the preheating condition is 400-600°C for 10-30 minutes, and those skilled in the art can adjust it according to actual conditions within this range. More preferably, the preheating condition is 500°C. Preheating for 15 minutes; in some embodiments of the present invention, the sintering conditions are sintering at 1050-1200° C. for 15-30 minutes, and those skilled in the art can adjust the sintering conditions according to actual conditions within this range. However, in a more preferred embodiment of the present invention, the sintering temperature is 1150-1200°C for 25 minutes (especially 1200°C for 25 minutes). Under this sintering condition, the strength of the obtained ceramsite is better, and it is more suitable for the construction field.
  • the electroplating sludge comes from the electroplating industrial park; the mica sand is obtained from a beneficiation company and is a gold mine tailings.
  • the content of SiO 2 is 73.6% and Al 2
  • the O 3 content is 11.4%; the aluminum sludge is taken from a water plant.
  • the present invention uses electroplating sludge, mica sand, and aluminum sludge as raw materials for the production of ceramsite.
  • the chemical components that can be provided in the raw materials should meet: SiO 2 48%-68%, Al 2 O 3 12%-18%, Fe 2 O 3 5%-10%, Na 2 O+K 2 O (that is, the sum of Na 2 O and K 2 O) 2.5%-7.0% (the% is a mass fraction and can be expressed as wt %).
  • the preparation scheme adopted is raw material pretreatment-mixing-granulation-drying-preheating-sintering-cooling.
  • SiO 2 and Al 2 O 3 are the main components of ceramsite into ceramics, and the content of SiO 2 and Al 2 O 3 should be within an appropriate range.
  • SiO 2 in the raw material The content of 2 is 48-68wt%, and the content of Al 2 O 3 is 12-18wt%. If the content of SiO 2 and Al 2 O 3 is too low, the strength of ceramsite will not meet the standard; if SiO 2 , Al 2 O 3 If the content is too high, it will affect the melting temperature and expansion performance of the ceramsite. If the content is too high at the same time, it will increase the sintering temperature of the ceramsite, and the energy consumption will also increase greatly.
  • the Fe 2 O 3 in the raw material has a certain fluxing effect while ensuring the gas and strength during swelling.
  • the content of Fe 2 O 3 in the raw material is preferably 5-10 wt%.
  • the content of Na 2 O and K 2 O is closely related to the sintering performance of the ceramsite.
  • the ceramic when the total content of Na 2 O and K 2 O in the raw material is 2.5-7.0 wt%, the ceramic can be strengthened. The strength of the particles can effectively reduce the sintering temperature and prevent the occurrence of ceramsite bonding.
  • the present invention also provides the ceramsite prepared according to the above preparation method.
  • the main mineral of the ceramsite obtained in the present invention is quartz (Quartz, SiO 2 ), and the main chemical composition of the ceramsite is: SiO 2 48%-68%, Al 2 O 3 12%-18%, Fe 2 O 3 5%-10%, Na 2 O+K 2 O 2.5%-7.0% (the% is the mass fraction and can be expressed as wt%); heavy metal leaching
  • the rate is qualified, and the single-grain compressive strength (single-grain crushing strength) of ceramsite can reach more than 15MPa, which can be used in the construction field, especially in building materials such as concrete aggregates.
  • the present invention uses electroplating sludge, mica sand, and aluminum sludge as raw materials for ceramsite production, which not only has simple process and low cost, but also can make full use of hazardous waste and solid waste to achieve "Three Modernizations" and "3R" principles.
  • Solidification of heavy metals in the ceramsite through sintering greatly reduces the leaching concentration of heavy metals and reduces the risk of environmental pollution.
  • heavy metals are reused as fluxes and the sintering temperature is reduced.
  • the sintered ceramsite also has a certain economic value, realizing the transformation of waste into treasure. On the other hand, it also reduces the use of natural non-renewable resources such as clay and shale, which is in line with my country's energy conservation and emission reduction policies;
  • Mica sand and aluminum sludge mainly provide the content of Si and Al in ceramsite to enhance the strength of ceramsite; electroplating sludge mainly provides flux (Fe 2 O 3 , MgO, Na 2 O, K 2 O, CaO), enhance the strength of ceramsite and reduce the sintering temperature of ceramsite.
  • Figure 1 is a process flow diagram of the present invention
  • Figure 2 is the particle size distribution diagram of electroplating sludge
  • Example 3 is an XRD pattern of the ceramsite obtained by sintering in Example 1 and Example 2;
  • Example 4 is an SEM image of the ceramsite obtained by sintering in Example 1 under a 1000 magnification lens
  • Fig. 5 is an SEM image of the ceramsite obtained by sintering in Example 1 at a magnification of 10,000.
  • Example 6 is an SEM image of the ceramsite obtained by sintering in Example 2 under a 1000 magnification lens
  • Fig. 7 is an SEM image of the ceramsite obtained by sintering in Example 2 under a 10000 magnification lens
  • Figure 8 is a comparison diagram of the strength and 24h water absorption of ceramsite obtained by sintering at different temperatures in Example 3;
  • Example 9 is a comparison diagram of heavy metal leaching concentration of ceramsite obtained by sintering at different temperatures in Example 3.
  • Example 10 is a comparison diagram of the bulk density, apparent density and void ratio of ceramsite obtained with different raw material ratios in Example 4.
  • reagents or raw materials used in the present invention can be purchased through conventional means. Unless otherwise specified, the reagents or raw materials used in the present invention are used in a conventional manner in the field or used in accordance with product instructions. In addition, any methods and materials similar or equivalent to the content described can be applied to the method of the present invention. The preferred implementation methods and materials described in this article are for demonstration purposes only.
  • a method for preparing sintered ceramsite from electroplating sludge of the present invention includes the following steps:
  • step (3) Add 3% to 5% of sodium silicate solution as a ceramsite binder to the ceramsite raw material obtained in step (2), and mix and granulate to obtain raw ceramsite.
  • step (3) Put the raw ceramsite obtained in step (3) into a muffle furnace at a heating rate of 10°C/min, first raise it to 105°C for drying for 1 hour, then raise it to 500°C for preheating for 15 minutes, and finally raise the temperature to 1050 Sintering at -1200°C for 25 minutes, the more preferred sintering temperature is 1150-1200°C, more preferably 1200°C.
  • the design of the present invention is based on the principles of "three modernizations” and “3R" of solid waste, and the selection of raw materials mainly considers factors such as resource utilization of hazardous waste, saving material costs, and improving economic and social benefits.
  • the electroplating sludge has a large particle size (as shown in Figure 2, the particles in the range of 900 ⁇ m-1000 ⁇ m are the most) and the water content is high, which has a significant impact on the mixing and granulation. Therefore, the raw materials need to be uniformly pretreated to avoid impact The performance of ceramsite.
  • the electroplating sludge in the embodiment of the present invention comes from the electroplating industrial park; the mica sand is taken from the beneficiation company, which is the tailings of gold mine beneficiation; the aluminum sludge is taken from the water plant.
  • the proportions of the electroplating sludge, mica sand, and aluminum sludge are 10%-30%, 50%-70%, and 20%, respectively.
  • Mica sand and aluminum sludge mainly provide the content of Si and Al in the ceramsite to increase the strength of the ceramsite; electroplating sludge mainly provides flux (Fe 2 O 3 , MgO, Na 2 O, K 2 O, CaO), Increase the strength of ceramsite and reduce the sintering temperature of ceramsite.
  • the raw materials with the main components shown in Table 1 are proportioned according to the mass percentages of electroplating sludge, mica sand, and aluminum sludge of 10%-30%, 50%-70%, and 20%, and the preparation is carried out according to the above method.
  • the main chemical components that can be provided meet the following content relationship (mass fraction, wt%): SiO 2 48%-68%, Al 2 O 3 12%-18%, Fe 2 O 3 5-10%, Na 2 O+ K 2 O2.5%-7.0%.
  • a method for preparing sintered ceramsite from electroplating sludge The raw material composition of the ceramsite is: 15% electroplating sludge, 65% mica sand, and 20% aluminum sludge.
  • step (3) Add 3% to 5% of sodium silicate solution as a ceramsite binder to the ceramsite raw material obtained in step (2), and mix and granulate to obtain raw ceramsite.
  • step (3) Put the raw ceramsite obtained in step (3) into a muffle furnace at a heating rate of 10°C/min, first raise it to 105°C for drying for 1 hour, then raise the temperature to 500°C for preheating for 15 minutes, and finally raise the temperature to 1200 Sintering at °C for 25min.
  • the single-grain crushing strength and cylinder compressive strength of the ceramsite are used to characterize the strength of the ceramsite.
  • the single-grain crushing strength experiment of the ceramsite uses a microcomputer-controlled electronic universal testing machine to load and destroy the single ceramsite.
  • Cylinder compressive strength is determined in accordance with the national standard "Lightweight Aggregate and Its Experimental Method Part 2: Lightweight Aggregate Experimental Method” (GB/T 17431.2-2010).
  • the single crushing strength of ceramsite is 17.48MPa and the cylinder compressive strength of ceramsite is 11.02MPa at this ratio.
  • the strength of ceramsite is higher than the strength requirements of high-strength lightweight aggregates in "Lightweight Aggregates and Experimental Methods Part 1: Lightweight Aggregates" (GB/T 17431.2-2010), and can be used in the construction field.
  • the ceramsite is leached under three conditions of acid, neutral and alkaline.
  • the leaching concentration of six common heavy metals (Cr, Ni, Cd, Pb, Cu, Zn) is far lower than the standard “Hazardous Waste Identification Standard Leaching Toxicity” Identification” (GB5085.3-2007).
  • the heavy metal leaching concentration was compared with the "Groundwater Quality Standard” (GB/T 14848-2017) and “Surface Water Environmental Quality Standard” (GB/T3838-2002), and it was found that the leaching concentration met the groundwater quality class III standard and the surface water environment Quality Class II standard.
  • the ceramsite was leached under alkaline conditions.
  • the leaching concentration of 6 common heavy metals (Cr, Ni, Cd, Pb, Cu, Zn) is shown in Table 2.
  • the XRD scan of the ceramsite is shown in Figure 3. It is found that the main crystal composition of the ceramsite is quartz. It is precisely because of the melting and sintering of the raw material powder at high temperature that silicate crystals such as quartz and the glass phase are amorphous. The substance makes the ceramsite have higher strength.
  • the SEM scan of the ceramsite shows that the inside of the ceramsite is relatively smooth, with certain voids, compact structure and high strength.
  • a method for preparing sintered ceramsite from electroplating sludge is: 20% electroplating sludge, 60% mica sand, and 20% aluminum sludge.
  • step (3) Add 3% to 5% of sodium silicate solution as a ceramsite binder to the ceramsite raw material obtained in step (2), and mix and granulate to obtain raw ceramsite.
  • step (3) Put the raw ceramsite obtained in step (3) into a muffle furnace at a heating rate of 10°C/min, first raise it to 105°C for drying for 1 hour, then raise the temperature to 500°C for preheating for 15 minutes, and finally raise the temperature to 1200 Sintering at °C for 25min.
  • the single-particle crushing strength and cylinder compressive strength of the ceramsite are used to characterize the strength of the ceramsite, and the test method is the same as that in Example 1.
  • the single crushing strength of the ceramsite is 16.16MPa and the cylinder compressive strength of the ceramsite is 10.53MPa at this ratio.
  • the strength of ceramsite is higher than the strength requirements of high-strength lightweight aggregates in "Lightweight Aggregates and Experimental Methods Part 1: Lightweight Aggregates" (GB/T 17431.2-2010), and can be used in the construction field.
  • the ceramsite is leached under three conditions of acid, neutral and alkaline.
  • the leaching concentration of six common heavy metals (Cr, Ni, Cd, Pb, Cu, Zn) is far lower than the standard “Hazardous Waste Identification Standard Leaching Toxicity” Identification” (GB5085.3-2007).
  • the heavy metal leaching concentration was compared with the "Groundwater Quality Standard” (GB/T 14848-2017) and “Surface Water Environmental Quality Standard” (GB/T3838-2002), and it was found that the leaching concentration met the groundwater quality class III standard and the surface water environment Quality Class II standard.
  • ceramsite is leached under alkaline conditions.
  • the leaching concentration of 6 common heavy metals (Cr, Ni, Cd, Pb, Cu, Zn) is shown in Table 3.
  • the XRD scan of the ceramsite is shown in Figure 3. It is found that the main component of the ceramsite is quartz. It is precisely because of the melting and sintering of the raw material powder at high temperature that silicate crystals such as quartz and glass phase amorphous substances are formed. , So that the ceramsite has a higher strength.
  • the SEM scan of the ceramsite shows that the inside of the ceramsite is relatively smooth, with certain voids, compact structure and high strength.
  • the preheating conditions can be adjusted according to actual conditions within 400-600°C/10-30min; the sintering conditions are adjusted according to actual conditions within 1050-1200°C/15-30min.
  • a method for preparing sintered ceramsite from electroplating sludge The raw material composition of ceramsite is: 15% electroplating sludge, 65% mica sand, and 20% aluminum sludge.
  • step (3) Add 3% to 5% of sodium silicate solution as a ceramsite binder to the ceramsite raw material obtained in step (2), and mix and granulate to obtain raw ceramsite.
  • step (3) Put the raw ceramsite obtained in step (3) into four parts into the muffle furnace at a heating rate of 10°C/min, first raise it to 105°C for drying for 1 hour, and then raise it to 500°C to preheat for 15 minutes, Finally, the temperature was raised to 1100°C, 1150°C, 1200°C, and 1250°C for 25 min.
  • the strength of the ceramsite is characterized by the single crushing strength of the ceramsite.
  • the test method is the same as in Example 1.
  • the calculation formula is: Among them, w a is the 24h water absorption rate of the ceramsite, %; m 0 is the mass of the ceramsite after being soaked in water for 24 hours, in g; m 1 is the mass of the dried ceramsite in g.
  • w a is the 24h water absorption rate of the ceramsite, %
  • m 0 is the mass of the ceramsite after being soaked in water for 24 hours, in g
  • m 1 is the mass of the dried ceramsite in g.
  • the sintering temperature has a significant effect on physical properties.
  • the single-grain crushing strength of ceramsite is only 3.67MPa, which is much lower than 14.86MPa at 1150°C.
  • the strength of ceramsite increases with the increase of sintering temperature. Decrease, the strength drops to 5.29MPa at 1250°C, mainly due to the excessive melting of the ceramsite at too high temperature and the destruction of the internal structure.
  • the ceramsite melts from a spherical shape to a flat shape, which directly affects the strength of the ceramsite; the water absorption rate is 1100
  • the °C is as high as 11.35%, mainly because the sintering temperature is low, the ceramsite melting effect is poor, the glaze layer is not formed on the surface, the internal structure is loose, and the glass phase formation is small.
  • ceramsite is leached with heavy metals.
  • the leaching concentration of 6 common heavy metals (Cr, Ni, Cd, Pb, Cu, Zn) is shown in Figure 9.
  • the leaching concentration of Cr is obviously affected by the sintering temperature.
  • Zn shows a downward trend with the increase of temperature, while Cu shows an upward trend.
  • the leaching concentration of Ni and Pb is low and the trend is gentle. Cd is not detected.
  • the mass ratio combination of electroplating sludge, mica sand, and aluminum sludge can be 10%, 70%, 20%; 25%, 55%, 20%; 30%, 50%, 20%.
  • the ceramsite with the following raw material composition was prepared according to the method of Example 1.
  • the mass percentages of the raw materials were: electroplating sludge 10%, mica sand 70%, aluminum sludge 20%; electroplating sludge 25%, mica sand 55% , Aluminum sludge 20%; and electroplating sludge 30%, mica sand 50%, aluminum sludge 20%.
  • ⁇ bu is the bulk density, in kg/m 3 , accurate to 1kg/m 3 ;
  • m t is the total mass of the volumetric cylinder and ceramsite, in g;
  • m v is the mass of the volumetric cylinder, in g;
  • V is the volumetric cylinder Volume, unit L.
  • the formula for calculating the apparent density is: Among them, ⁇ ap is the apparent density, in kg/m 3 , accurate to 1 kg/m 3 ; V t is the total volume of water and ceramsite, in L; m is the mass of ceramsite in g.
  • the void ratio calculation formula is: Among them, v is the porosity, %; ⁇ bu is the bulk density, in kg/m 3 , accurate to 1 kg/m 3 ; ⁇ ap is the apparent density, in kg/m 3 , accurate to 1 kg/m 3 . Examples 1 and 2 were tested at the same time, and the results are shown in Figure 10. The most important indicator of density is the bulk density, which is combined with apparent density and porosity for comparative analysis.
  • the bulk density directly affects the function of the ceramsite.
  • the ceramsite with a bulk density below 600kg/m 3 is mainly used for water treatment and has no specific requirements for strength; the bulk density is in the range of 600kg/m 3 to 1200kg/m 3
  • the ceramsite inside can be used in the construction field.
  • the bulk density of the ceramsite of the present invention is in the range of 1150kg/m 3 -1300kg/m 3 (when the amount of electroplating sludge is 30%, it exceeds 1200kg/m 3 ).
  • the apparent density is The range is between 2000kg/m 3 -2200kg/m 3 and the overall porosity is between 40%-42%.
  • the ceramsite of the present invention has a good density overall, but the bulk density and apparent density are both When the electroplating sludge is mixed with 15%, it reaches the lowest level, which is 1177.06kg/m 3 and 2000.54kg/m 3 respectively .

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Abstract

一种电镀污泥烧结陶粒的制备方法，陶粒的原料比例为云母砂(金矿选矿尾砂)50％-70％、给水厂铝污泥20％、电镀工业园电镀污泥10％-30％。将原料进行干燥、破碎磨粉预处理，混合搅拌均匀，然后加入3％～5％的硅酸钠溶液作为陶粒的粘结剂，混合造粒得生陶粒，再经过干燥、预热、烧结、冷却等步骤制成陶粒。采用铝泥和云母砂代替黏土提供Al 2O 3、SiO 2,电镀污泥提供助熔剂，显著的降低了陶粒制作成本。所制作的陶粒具有抗压强度高、浸出毒性低等优点，可大规模处置电镀污泥、给水厂污泥，实现危险废物无害化处理、资源化利用，同时节约了电镀污泥、铝污泥处置成本，作为建材，具有良好的经济效益和社会效益。

Description

一种利用电镀污泥烧结建筑陶粒的制备方法
相关申请的交叉引用
本申请要求于2019年07月05日提交的标题为“一种利用电镀污泥烧结建筑陶粒的制备方法”的中国专利申请CN201910602978.8的权益和优先权。上述申请的全部内容通过引用并入本文，用于所有目的。
技术领域
本发明涉及危险废物的回收利用，污泥废物利用技术领域，尤其涉及一种电镀污泥烧结陶粒的制备方法。
背景技术
公开该背景技术部分的信息仅仅旨在增加对本发明的总体背景的理解，而不必然被视为承认或以任何形式暗示该信息构成已经成为本领域一般技术人员所公知的现有技术。
电镀污泥是指电镀废水处理过程中产生副产物，由于电镀废水中含有各类强酸、强碱及金属溶液，甚至氰化物、铬酸酐等有毒有害的化学品，因此电镀污泥为铜、铬、镍等重金属氧化物为主的沉淀物。我国电镀污泥年产数百万吨，其主要污染物为各种重金属，若处置不当会对环境造成二次污染。电镀污泥是国家危险废物名录中非常明确的、具有毒性的固体废物。如今电镀污泥常见的处置方式为填埋，既没有对电镀污泥中得重金属进行回收利用，同时还有污染环境的风险。云母砂为金矿尾砂，金矿的半生元素有铜、锌、铅、锑、砷等，若尾矿处理不当，经风吹雨淋，尾砂粉或其中的有毒有害物质易扩散到大气、水体和土壤中，造成环境污染；给水厂铝污泥作为固体废物也存在危害大、难处置等问题。在以往研究发明中并没有有关此三类固体废物协同处置利用的研究，因此需要找到一种节 1能、环保、绿色、高效的再利用此类固体废物的方法去改善现有的处理处置问题。
陶粒作为一种建筑用轻骨料，其具有体轻、强度高、吸水率低、保温、隔热、抗震及耐火等特性，因而受到了人们的极大重视。它的用途广泛，可取代普通砂石配置轻集料混凝土。但当前我国陶粒主要以黏土和页岩陶粒为主，而黏土原料的来源绝大部分取自于耕地，页岩陶粒原料须开山取石破坏生态环境，不符合可持续发展战略。因此需寻找新的陶粒制造材料并尽可能的降低其原料成本，减少粘结剂、膨胀剂等添加剂的使用量，从而提高陶粒的经济效益和社会效益。
发明内容
现有克服现有的技术缺点，本发明的目的在于提供一种电镀污泥烧结陶粒的制备方法，将电镀污泥作为烧结陶粒的原料，一方面可以将其中的铬等重金属元素固化在陶粒中，极大的降低其浸出浓度，实现无害化处置；另一方面可以取代部分粘土、页岩等天然材料，节约日益减少的天然粘土质原材料的使用量，达到无害化处置的目的。使之成为有实际应用价值的建材产品，成为此类固体废弃物资源化利用的新途径，同时保护环境、节约自然资源，实现良好的经济效益和社会效益。
有鉴于此，本发明的目的在于提供一种电镀污泥烧结陶粒的制备方法及该制备方法制备得到的陶粒，该陶粒用于建筑领域。
为了实现上述目的，本发明采取的技术方案是：
一种电镀污泥烧结陶粒的制备方法，包括以下步骤：
(1)将电镀污泥、云母砂、铝污泥分别干燥至恒重、研磨成粉过筛80目筛；
(2)将电镀污泥、云母砂、铝污泥混合搅拌均匀得到陶粒原料；
(3)将3％～5％的硅酸钠溶液作为陶粒粘结剂加入到步骤(2)中得到的陶粒原料，混合造粒得生陶粒。
(4)将步骤(3)所得的生陶粒放入到马弗炉中，升温速率为10℃/min，先升至105℃干燥1h，然后升温至500℃预热15min，最后升温至1200℃烧结25min。
(5)让烧结后的陶粒在炉内缓慢降温至室温即可得到陶粒。
按质量份计，所述电镀污泥、云母砂、铝污泥的质量百分比分别为电镀污泥10％-30％、云母砂50％-70％、铝污泥20％。三种原料的质量百分比之和为100％。
在本发明的一些实施方式中，所述电镀污泥、云母砂、铝污泥的质量百分比分别为电镀污泥10％-25％、云母砂55％-70％、铝污泥20％。三种原料的质量百分比之和为100％。
在本发明的一些实施方式中，所述电镀污泥、云母砂、铝污泥的质量百分比分别为电镀污泥15％-25％、云母砂55％-65％、铝污泥20％。三种原料的质量百分比之和为100％。
在本发明的一些实施例中，电镀污泥、云母砂、铝污泥的质量百分比组合形式可以为：电镀污泥10％，云母砂70％，铝污泥20％；电镀污泥25％、云母砂55％、铝污泥20％；或者电镀污泥30％，云母砂50％，铝污泥20％。
在本发明的一些实施例中，预热条件为在400-600℃条件下预热10-30min，本领域技术人员可在该范围内根据实际情况调整，较为优选地，预热条件为500℃预热15min；在本发明的一些实施方式中，烧结条件为在1050-1200℃下烧结15-30min，本领域技术人员可在该范围内根据实际情况调整。但是，在本发明较为优选的实施方式中，所述烧结温度为1150-1200℃烧结25min(尤其1200℃烧结25min)。在该烧结条件下，所得陶粒的强度更好，更适用于及建筑领域。
所述电镀污泥来自于电镀工业园区；所述云母砂取自选矿公司，为金矿选矿尾砂，比如，在一些金矿选矿尾砂中，其成分中SiO 2含量为73.6％、Al 2O 3含量为11.4％；所述铝污泥取自自来水厂。
本发明以电镀污泥、云母砂、铝污泥作为陶粒制作的原料，原料中可提供的化学成分应满足：SiO 248％-68％，Al 2O 312％-18％，Fe 2O 35％-10％， Na 2O+K 2O(即Na 2O与K 2O之和)2.5％-7.0％(所述％为质量分数，可表示为wt％)。采用的制备方案是原料预处理-混合-造粒-干燥-预热-烧结-冷却。
在本发明的实施方式中，SiO 2、Al 2O 3是陶粒成陶的主体成分，SiO 2、Al 2O 3的含量应在一个适量的范围内，在一些实施方式中，原料中SiO 2的含量为48-68wt％，Al 2O 3的含量为12-18wt％，若SiO 2、Al 2O 3的含量过低，会导致陶粒强度不达标；若SiO 2、Al 2O 3含量过高，则又会影响陶粒熔融温度及膨胀性能，若同时含量过高则会提高陶粒的烧结温度，同时耗能也会大量增加。在本发明的实施方式中，原料中的Fe 2O 3在保证烧胀时的气体和强度的同时还具有一定的助熔作用，原料中Fe 2O 3的含量以5-10wt％为宜。Na 2O、K 2O的含量与陶粒的烧结性能息息相关，在本发明的实施方式中，当原料中Na 2O和K 2O的含量之和为2.5-7.0wt％时，能够增强陶粒的强度，并有效降低烧结温度，还能防止陶粒黏结现象的发生。
以及，本发明还提供了根据上述制备方法制备得到的陶粒，本发明所得陶粒主要的矿物为石英(Quartz，SiO 2)，陶粒的主要化学成分为：SiO 248％-68％，Al 2O 312％-18％，Fe 2O 35％-10％，Na 2O+K 2O2.5％-7.0％(所述％为质量分数，可表示为wt％)；重金属浸出率合格，陶粒单粒抗压强度(单粒压碎强度)可达15MPa以上，可应用于建筑领域，尤其可应用于混凝土骨料等建筑材料中。
本发明的有益效果：
(1)与现有技术相比，本发明采用电镀污泥、云母砂、铝污泥作为陶粒制作的原料，不但工艺简单、成本低，还可以使危险废物、固体废物得到充分利用，达到“三化”和“3R”原则的要求。通过烧结将重金属固化在陶粒中，既极大的降低了重金属的浸出浓度，降低了环境污染的风险，同时也是将重金属作为助熔剂再利用，降低了烧结温度。烧结出来的陶粒也存在一定的经济价值，实现了变废为宝。另一方面来讲也降低了黏土、页岩等天然不易再生资源的使用量，符合我国节能减排政策；
(2)云母砂、铝污泥主要提供陶粒中的Si和Al的含量，增强陶粒的强度；电镀污泥主要提供助熔剂(Fe 2O 3、MgO、Na 2O、K 2O、CaO)，增强陶粒的强度、降低陶粒的烧结温度。
(3)添加3％～5％的硅酸钠溶液作为陶粒粘结剂，在造球的过程中起到粘结作用，提高成球率。
附图说明
构成本申请的一部分的说明书附图用来提供对本申请的进一步理解，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。以下，结合附图来详细说明本发明的实施方案，其中：
图1是本发明工艺流程图；
图2是电镀污泥粒径分布图；
图3是实施例1和实施例2烧结所得陶粒的XRD图；
图4是实施例1烧结所得陶粒在1000倍镜下的SEM图；
图5是实施例1烧结所得陶粒在10000倍镜下的SEM图。
图6是实施例2烧结所得陶粒在1000倍镜下的SEM图；
图7是实施例2烧结所得陶粒在10000倍镜下的SEM图；
图8是实施例3不同温度烧结所得陶粒强度及24h吸水率对比图；
图9是实施例3不同温度烧结所得陶粒重金属浸出浓度对比图；
图10为实施例4中不同原料配比所得陶粒堆积密度、表观密度和空隙率的对比图。
实施发明的最佳方式
下面结合具体实施例，进一步阐述本发明。应理解，这些实施例仅用于说明本发明而不用于限制本发明的范围。下列实施例中未注明具体条件的实验方法，通常按照常规条件或按照制造厂商所建议的条件。
除非另行定义，文中所使用的所有专业与科学用语与本领域熟练人员所熟悉的意义相同。本发明所使用的试剂或原料均可通过常规途径购买获得，如无特殊说明，本发明所使用的试剂或原料均按照本领域常规方式使用或者按照产品说明书使用。此外，任何与所记载内容相似或均等的方法及材料皆可应用于本发明方法中。文中所述的较佳实施方法与材料仅作示范之用。
如图1所示，本发明一种电镀污泥烧结陶粒的制备方法，包括如下步骤：
(1)将电镀污泥、云母砂、铝污泥分别干燥至恒重、研磨成粉过筛80目筛；
(2)将电镀污泥、云母砂、铝污泥混合搅拌均匀得到陶粒原料；
(3)将3％～5％的硅酸钠溶液作为陶粒粘结剂加入到步骤(2)中得到的陶粒原料，混合造粒得生陶粒。
(4)将步骤(3)所得的生陶粒放入到马弗炉中，升温速率为10℃/min，先升至105℃干燥1h，然后升温至500℃预热15min，最后升温至1050-1200℃烧结25min，较为优选的烧结温度为1150-1200℃，更为优选为1200℃。
(5)让烧结后的陶粒在炉内缓慢降温至室温即可得到陶粒。
本发明设计基于固体废物的的“三化”和“3R”原则，原材料的选择主要考虑危险废物资源化利用、节约材料成本、提高经济效益及社会效益等因素。电镀污泥粒径较大(如图2，粒径在900μm-1000μm区间内的颗粒最多)且含水率较高，对混合造粒有明显影响，因此需对原材料进行统一的预处理，以免影响陶粒的性能。
具体地，本发明实施例中的电镀污泥来自于电镀工业园区；云母砂取自选矿公司，为金矿选矿尾砂；铝污泥取自自来水厂。所述电镀污泥、云母砂、铝污泥的比例分别为10％-30％、50％-70％、20％。
对本发明实施例中所选材料(电镀污泥、云母砂和铝污泥)进行成分分析，所得结果如表1所示
表1 原料元素组成(质量分数，％)
  SiO 2 Al 2O 3 Fe 2O 3 CaO K 2O Na 2O MgO 其他
电镀污泥 2 2 44 3 1 - 1 47
云母砂 75 12 2 2 4 3 1 1
铝污泥 29 41 11 9 2 1 1 6
云母砂、铝污泥主要提供陶粒中的Si和Al的含量，增加陶粒的强度；电镀污泥主要提供助熔剂(Fe 2O 3、MgO、Na 2O、K 2O、CaO)，增加陶粒的强度、降低陶粒的烧结温度。
以具有表1所示主要成分组成的原料按照电镀污泥、云母砂、铝污泥的质量百分比为10％-30％、50％-70％、20％进行配比，按照上述方法进行制备，所能提供的主要化学成分满足以下含量关系(质量分数，wt％)：SiO 248％-68％，Al 2O 312％-18％，Fe 2O 35-10％，Na 2O+K 2O2.5％-7.0％。
实施例1
一种电镀污泥烧结陶粒的制备方法，陶粒的原料组成为：电镀污泥15％，云母砂65％，铝污泥20％。
(1)将电镀污泥、云母砂、铝污泥分别放置于105℃的烘箱干燥至恒重，取出后研磨成粉过筛80目筛待用；
(2)将电镀污泥、云母砂、铝污泥按比例混合搅拌均匀得到陶粒原料；
(3)将3％～5％的硅酸钠溶液作为陶粒粘结剂加入到步骤(2)中得到的陶粒原料，混合造粒得生陶粒。
(4)将步骤(3)所得的生陶粒放入到马弗炉中，升温速率为10℃/min，先升至105℃干燥1h，然后升温至500℃预热15min，最后升温至1200℃烧结25min。
(5)让烧结后的陶粒在炉内缓慢降温至室温即可得到陶粒。
对陶粒进行性能测试：
本发明以陶粒的单粒压碎强度及筒压强度表征陶粒强度，其中，陶粒的单粒压碎强度实验使用微机控制电子万能试验机对单粒陶粒进行加载破坏，测得单粒被压碎的破坏荷载Pc，根据式S＝2.8Pc/(π*2)进行计算。其中：S为单粒的压碎强度，Mpa；Pc为破坏荷载，N；X为陶粒起始受力时与上下承压板接触两点间的距离，mm。筒压强度按照参考国标《轻集料及其实验方法第2部分：轻集料实验方法》(GB/T 17431.2-2010)测定，计算公式为
Figure PCTCN2020093459-appb-000001
其中，f a为陶粒筒压强度，单位MPa，精确至0.1MPa；p 1为冲压模压入20mm时的压力值，单位为N；p 2为冲压模的质量，单位N；F为承压面积，即冲压模面积F＝10000mm 2。通过计算，在此配比下陶粒的单粒压碎强度为17.48MPa，陶粒的筒压强度为11.02MPa。陶粒强度高于《轻集料及其实验方法第1部分：轻集料》(GB/T 17431.2-2010)中高强轻集料强度要求，可应用于建筑领域。
在酸性、中性及碱性三种条件下对陶粒进行重金属浸出，6种常见重金属(Cr、Ni、Cd、Pb、Cu、Zn)浸出浓度均远低于标准《危险废物鉴别标准浸出毒性鉴别》(GB5085.3—2007)。同时将重金属浸出浓度分别与《地下水质量标准》(GB/T 14848-2017)、《地表水环境质量标准》(GB/T3838-2002)对比，发现浸出浓度符合地下水水质Ⅲ类标准、地表水环境质量Ⅱ类标准。
其中，在碱性条件下对陶粒进行重金属浸出，6种常见重金属(Cr、Ni、Cd、Pb、Cu、Zn)浸出浓度如表2所示。
表2(mg/L)
Figure PCTCN2020093459-appb-000002
对陶粒进行XRD扫描，其结果如图3所示，发现陶粒的主要晶体组成是石英，正是由于在高温下原料粉末之间熔融烧结，形成石英等硅酸盐晶体和玻璃相无定型物质，才使得陶粒具有较高的强度。对陶粒进行SEM扫描，由图4和图5可知，陶粒内部较为光滑，存在一定的空隙，结构紧密，强度较高。
实施例2
一种电镀污泥烧结陶粒的制备方法，陶粒的原料组成为：电镀污泥20％，云母砂60％，铝污泥20％
(1)将电镀污泥、云母砂、铝污泥分别放置于105℃的烘箱干燥至恒重，取出后研磨成粉过筛80目筛待用；
(2)将电镀污泥、云母砂、铝污泥按比例混合搅拌均匀得到陶粒原料；
(3)将3％～5％的硅酸钠溶液作为陶粒粘结剂加入到步骤(2)中得到的陶粒原料，混合造粒得生陶粒。
(4)将步骤(3)所得的生陶粒放入到马弗炉中，升温速率为10℃/min，先升至105℃干燥1h，然后升温至500℃预热15min，最后升温至1200℃烧结25min。
(5)让烧结后的陶粒在炉内缓慢降温至室温即可得到陶粒。
对陶粒进行性能测试
本发明以陶粒的单粒压碎强度及筒压强度表征陶粒强度，测试方法同实施例1。通过计算，在此配比下陶粒的单粒压碎强度为16.16MPa，陶粒的筒压强度为10.53MPa。陶粒强度高于《轻集料及其实验方法第1部分：轻集料》(GB/T 17431.2—2010)中高强轻集料强度要求，可应用于建筑领域。
在酸性、中性及碱性三种条件下对陶粒进行重金属浸出，6种常见重金属(Cr、Ni、Cd、Pb、Cu、Zn)浸出浓度均远低于标准《危险废物鉴别标准浸出毒性鉴别》(GB5085.3-2007)。同时将重金属浸出浓度分别与《地下水质量标准》(GB/T 14848-2017)、《地表水环境质量标准》(GB/T3838-2002)对比，发现浸出浓度符合地下水水质Ⅲ类标准、地表水环境质量Ⅱ类标准。
其中，在碱性条件下对陶粒进行重金属浸出，6种常见重金属(Cr、Ni、Cd、Pb、Cu、Zn)浸出浓度如表3所示。
表3(mg/L)
Figure PCTCN2020093459-appb-000003
对陶粒进行XRD扫描，其结果如图3所示，发现陶粒的主要成分是石英，正是由于在高温下原料粉末之间熔融烧结，形成石英等硅酸盐晶体和玻璃相无定型物质，才使得陶粒具有较高的强度。对陶粒进行SEM扫描，由图6和图7可知，陶粒内部较为光滑，存在一定的空隙，结构紧密，强度较高。
在本发明下述更多的实施例中，预热条件可以在400-600℃/10-30min内根据实际情况调整；烧结条件在1050-1200℃/15-30min内根据实际情况调整。
实施例3
一种电镀污泥烧结陶粒的制备方法，陶粒的原料组成为：电镀污泥15％，云母砂65％，铝污泥20％
(1)将电镀污泥、云母砂、铝污泥分别放置于105℃的烘箱干燥至恒重，取出后研磨成粉过筛80目筛待用；
(2)将电镀污泥、云母砂、铝污泥按比例混合搅拌均匀得到陶粒原料；
(3)将3％～5％的硅酸钠溶液作为陶粒粘结剂加入到步骤(2)中得到的陶粒原料，混合造粒得生陶粒。
(4)将步骤(3)所得的生陶粒分为四份放入到马弗炉中，升温速率为10℃/min，先升至105℃干燥1h，然后升温至500℃预热15min，最后分别升温至1100℃、1150℃、1200℃、1250℃烧结25min。
对陶粒进行性能测试
本发明以陶粒的单粒压碎强度表征陶粒强度。测试方法同实施例1。并根据国标《轻集料及其实验方法第2部分：轻集料实验方法》(GB/T17431.2-2010)测量吸水率，计算公式为：
Figure PCTCN2020093459-appb-000004
其中，w a为陶粒24h吸水率，％；m 0为浸水24h后陶粒的质量，单位g；m 1为干燥陶粒的质量，单位g。通过计算，在此配比下不同烧结温度陶粒的单粒压碎强度及24h吸水率如图8。陶粒强度及吸水率受烧结温度影响明显，陶粒在烧结温度为1150℃、1200℃时，陶粒强度高于《轻集料及其实验方法第1部分：轻集料》(GB/T 17431.2-2010)中高强轻集料强度要求，可应用于建筑领域。
根据图8所示，烧结温度对物理性能有着显著的影响，1100℃时，陶粒的单粒压碎强度仅3.67MPa，远低于1150℃时14.86MPa，之后陶粒强度随烧结温度上升而下降，在1250℃时强度下降至5.29MPa，主要原因是温度过高陶粒过度熔融，内部结构被破坏，陶粒从球形热融成扁平状，直接影响了陶粒的强度；吸水率在1100℃为高达11.35％，主要是烧结温度较低，陶粒熔融效果差，表面未形成釉层，内部结构松散、玻璃相生成量较小。
在碱性条件下对陶粒进行重金属浸出，6种常见重金属(Cr、Ni、Cd、Pb、Cu、Zn)浸出浓度如图9所示。Cr浸出浓度受烧结温度影响明显，Zn随温度的升高呈下降趋势、Cu则呈上升趋势，Ni、Pb浸出浓度较低且趋势平缓，Cd未检出。
在本发明下述更多的实施例中，电镀污泥、云母砂、铝污泥的质量比例组合形式可以为10％，70％，20％；25％，55％，20％；30％，50％，20％。
实施例4
按实施例1的方法制备得到具有以下原料组成的陶粒，各原料质量百分比分别为：电镀污泥10％，云母砂70％，铝污泥20％；电镀污泥25％，云母砂55％，铝污泥20％；以及电镀污泥30％，云母砂50％，铝污泥20％。
根据国标《轻集料及其实验方法第2部分：轻集料实验方法》(GB/T17431.2-2010)针对堆积密度、表观密度和空隙率进行测量，取适量陶粒分为两份待测，取两次平均值。堆积密度计算公式：
Figure PCTCN2020093459-appb-000005
其中，ρ bu为堆积密度，单位kg/m 3，精确至1kg/m 3；m t为容量筒和陶粒的总质量，单位g；m v为容量筒质量，单位g；V为容量筒体积，单位L。表观密度计算公式为：
Figure PCTCN2020093459-appb-000006
其中，ρ ap为表观密度，单位kg/m 3，精确至1kg/m 3；V t为水和陶粒的总体积，单位L；m为陶粒质量，单位g。空隙率计算公式为：
Figure PCTCN2020093459-appb-000007
其中，v为空隙率，％；，ρ bu为堆积密度，单位kg/m 3，精确至1kg/m 3；ρ ap为表观密度，单位kg/m 3，精确至 1kg/m 3。同时测试实施例1、2，结果如图10所示。密度中最重要的指标为堆积密度，同时结合表观密度及孔隙率共同进行对比分析。堆积密度的大小直接影响着陶粒的功能，其中堆积密度在600kg/m 3以下的陶粒主要用于水处理，对强度并无具体要求；堆积密度在600kg/m 3到1200kg/m 3范围内的陶粒可应用于建筑领域。根据图10可知，本发明的陶粒堆积密度的范围在1150kg/m 3-1300kg/m 3之间(电镀污泥掺入量为30％时，超过了1200kg/m 3)，表观密度的范围在2000kg/m 3-2200kg/m 3之间，孔隙率整体在40％-42％之间，本发明的陶粒整体上均具有较好的密度，但以堆积密度、表观密度均在电镀污泥掺入量为15％时达到最低，分别为1177.06kg/m 3、2000.54kg/m 3。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (4)

  1. 一种电镀污泥烧结陶粒的制备方法，其特征在于，包括以下步骤：
    (1)将电镀污泥、云母砂、铝污泥分别干燥至恒重、研磨成粉过筛80目筛；
    (2)将电镀污泥、云母砂、铝污泥混合搅拌均匀得到陶粒原料；
    (3)将3％～5％的硅酸钠溶液作为陶粒粘结剂加入到步骤(2)中得到的陶粒原料，混合造粒得生陶粒。
    (4)将步骤(3)所得的生陶粒放入到马弗炉中，升温速率为10℃/min，先升至105℃干燥1h，然后升温至500℃预热15min，最后升温至1050-1200℃烧结25min。
    (5)让烧结后的陶粒在炉内缓慢降温至室温即可得到陶粒。
  2. 根据权利要求1所述的制备方法，其特征在于，按质量份计，所述电镀污泥、云母砂、铝污泥的比例分别为10％-30％、50％-70％、20％。
  3. 根据权利要求1或2所述一种电镀污泥烧结陶粒的制备方法，其特征在于，电镀污泥、云母砂、铝污泥作为陶粒制作的原料，原料提供的主要化学成分满足以下质量百分含量：SiO 2 48％-68％，Al 2O 3 12％-18％，Fe 2O 3 5-10％，Na 2O+K 2O 2.5％-7.0％。
  4. 根据权利要求1所述的制备方法，其特征在于，所得陶粒主要的矿物为石英；重金属浸出率合格，陶粒单粒抗压强度达15MPa以上，可应用于建筑领域。
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