CN110922159A - 碱激发废弃砖粉固化重金属离子轻质保温材料及其制备方法 - Google Patents
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Abstract
本发明公布了一种碱激发废弃砖粉固化重金属离子轻质保温材料及其制备方法,是由以下组分按下述重量份制成的:废弃玻璃54‑60份、废弃砖粉12‑18份、重金属5‑10份、3.5mol/L NaOH 18‑22份。本发明以NaOH为碱激发剂,采用废弃玻璃和废弃砖粉调节材料中硅铝相含量组成,并通过烧结方法使材料形成致密交联结构进而实现对重金属离子的固化。采用上述方法制备的材料不仅具有良好的轻质保温特性,而且生产过程利用大量的工业废弃物如废弃玻璃、废弃砖粉等,同时通过烧结方式可固化大量重金属离子,进而实现利废节能、绿色环保的目的。
Description
技术领域
本发明属于建筑材料技术领域,尤其是涉及一种碱激发废弃砖粉固化重金属离子轻质保温材料及其制备方法。
背景技术
传统工业固体废弃物处理主要通过土地回填、焚烧等,从而造成土地资源浪费和环境污染。利用工业固体废弃物制备建筑材料被认为是固体废弃物处理的最安全的方法。其中,采用碱激发方法制备建筑材料是高效利用固体废弃物的有效手段之一。碱激发方法可以充分的利用原料中的活性二氧化硅和氧化铝等氧化物,使材料形成致密的无定型凝胶结构。
目前,工业固体废弃物主要有废弃玻璃、红黏土砖、陶瓷以及粉煤灰、矿渣、钢渣、粒化高炉矿渣等,而玻璃以及废弃红砖含有丰富的二氧化硅和氧化铝成分,非常适合采用碱激发的方法加以利用。由于制备材料的过程中采用固相烧结的方式,烧结后的材料较为致密,因此较为适合固化一些有害的重金属离子。从以上几个角度出发,采用碱激发废弃砖粉固化重金属离子将是一项切实可行并且绿色环保的重要手段。
发明内容
本发明的目的是为了提供一种碱激发废弃砖粉固化重金属离子轻质保温材料及其制备方法,该保温材料成本低,绿色、环保。
为了解决现有技术存在的问题,本发明采用的技术方案是:
一种碱激发废弃砖粉固化重金属离子轻质保温材料,是由以下组分按下述重量份制成的:
废弃玻璃54-60份、废弃砖粉12-18份、重金属5-10份、3.5mol/L NaOH溶液18-22份。
所述的废弃玻璃中二氧化硅含量≥70%,平均粒径≤50μm。
所述的废弃砖粉中二氧化硅含量≥50%,氧化铝含量≥10%,平均粒径≤80μm。
所述的重金属为干粉状态,其平均粒径≤80μm。
所述的3.5mol/L NaOH溶液,采用化学分析纯级NaOH配制。
所述的一种碱激发废弃砖粉固化重金属离子轻质保温材料的制备方法,包括以下步骤:
首先,称取废弃玻璃54-60份、废弃砖粉12-18份、重金属5-10份在搅拌器中干混,以100r/min速度慢搅2~3min;然后,将18-22份3.5mol/L NaOH溶液快速倒入搅拌器中,在100r/min速度下慢搅2min,接着在300r/min速度下快搅3min,其次,将上述配制的浆料浇筑在模具中并在湿度95%、温度30℃条件下养护3~4h;最后,将养护后的上述试块进行脱模,并在加热箱内升温至750~850℃烧结并保持1h。
本发明与现有技术相比具有以下优点和效果:
1、本发明一种碱激发废弃砖粉固化重金属离子并制备轻质保温材料的方法,以3.5mol/L NaOH为碱激发剂,采用废弃玻璃和废弃砖粉调节材料中硅铝相含量组成,并通过烧结方法使材料形成致密交联结构进而实现对重金属离子的固化,并可通过配合比参数优化提高重金属离子的固化效率。
2、本发明一种碱激发废弃砖粉固化重金属离子轻质保温材料的制备方法,具有可调控性。原材料中采用的废弃砖粉、废弃玻璃以及碱激发剂NaOH的配比会影响制备试块中自由水以及化学结合水的含量,在对制备试块在750~850℃条件下进行烧结时,会将自由水以及产物中化学结合水排出,从而使试块中产生大量的孔结构,而材料的孔结构(孔径、孔隙状态、孔隙率)特性与原材料配比密切相关。因此本发明中采用原材料配比优化与控制可以实现对材料的孔结构(孔径、孔隙状态、孔隙率)制备控制,从而提高孔结构状态与保温性能之间的匹配关系。
3、本发明一种碱激发废弃砖粉固化重金属离子轻质保温材料,由于采用废弃玻璃、废弃砖粉等固体废弃物,成本较低,且绿色环保。
4、本发明制备工艺简单,且烧结温度较低,可降低能耗。
具体实施方式
下面结合具体实施例对本发明进行进一步详细说明,但本发明的保护范围不受具体的实施例所限制,以权利要求书为准。另外,以不违背本发明技术方案的前提下,对本发明所作的本领域普通技术人员容易实现的任何改动或改变都将落入本发明的权利要求范围内。
实施列1:
本实施例一种碱激发废弃砖粉固化重金属离子轻质保温材料是由以下组分按下述重量制成的:
废弃玻璃54kg、废弃砖粉18kg、含铅和铬重金属干粉10kg、3.5mol/L NaOH溶液22kg。
本实施例中所述的废弃玻璃中二氧化硅含量为70%,平均粒径45μm。
本实施例所述的废弃砖粉中二氧化硅含量60%,氧化铝含量12%,平均粒径60μm。
本实施例中所述的重金属为干粉状态,且其平均粒径62.5μm。
本实施例中所述的3.5mol/L NaOH溶液,采用化学分析纯级NaOH配制。
本实施例中所述的一种碱激发废弃砖粉固化重金属离子轻质保温材料的制备方法,按照以下步骤完成:
首先,称取废弃玻璃54kg、废弃砖粉18kg、含铅和铬重金属干粉10kg在搅拌器中干混,以100r/min速度慢搅2~3min;然后,将22kg 3.5mol/L NaOH 快速倒入搅拌器中,在100r/min速度下慢搅2min,接着在300r/min速度下快搅3min。其次,将上述配制的浆料浇筑在模具中并在湿度95%,温度30℃条件下养护3~4h。最后,将养护后的上述试块进行脱模,并在加热箱内升温至750~850℃并保持1h。
按照本实施例所述的一种碱激发废弃砖粉固化重金属离子轻质保温材料的制备方法,制备的轻质保温材料总孔隙率可以达到60%,最可几孔径120μm,导热系数为0.18W/m·k。
实施例2:
本实施例一种碱激发废弃砖粉固化重金属离子轻质保温材料是由以下组分按下述重量制成的:
废弃玻璃60kg、废弃砖粉12kg、含锌和钴重金属干粉5kg、3.5mol/L NaOH溶18kg。
本实施例中所述的废弃玻璃中二氧化硅含量为73%,平均粒径41μm。
本实施例所述的废弃砖粉中二氧化硅含量62%,氧化铝含量13%,平均粒径58μm。
本实施例中所述的重金属为干粉状态,且其平均粒径6.5μm。
其余同实施例1 。
本实施例一种碱激发废弃砖粉固化重金属离子轻质保温材料的制备方法同实施例1。
按照本实施例所述的一种碱激发废弃砖粉固化重金属离子轻质保温材料的制备方法,制备的轻质保温材料总孔隙率可以达到45%,最可几孔径113μm,导热系数为0.23W/m·k。
实施例3:
本实施例一种碱激发废弃砖粉固化重金属离子轻质保温材料是由以下组分按下述重量制成的:
废弃玻璃56kg、废弃砖粉15kg、含锰和镉重金属干粉8kg、3.5mol/L NaOH溶20kg。
本实施例中所述的废弃玻璃中二氧化硅含量为75%,平均粒径44μm。
本实施例所述的废弃砖粉中二氧化硅含量61%,氧化铝含量11%,平均粒径59μm。
本实施例中所述的重金属为干粉状态,且其平均粒径60.0μm。
其余同实施例1 。
本实施例一种碱激发废弃砖粉固化重金属离子轻质保温材料的制备方法同实施例1。
按照本实施例所述的一种碱激发废弃砖粉固化重金属离子轻质保温材料的制备方法,制备的轻质保温材料总孔隙率可以达到57.6%,最可几孔径115μm,导热系数为0.19W/m·k。
Claims (6)
1.一种碱激发废弃砖粉固化重金属离子轻质保温材料,其特征在于是由以下组分按下述重量份制成的:
废弃玻璃54-60份、废弃砖粉12-18份、重金属5-10份、3.5mol/L NaOH溶液18-22份。
2.根据权利要求1所述的一种碱激发废弃砖粉固化重金属离子轻质保温材料,其特征在于:所述的废弃玻璃中二氧化硅含量≥70%,平均粒径≤50μm。
3.根据权利要求1所述的一种碱激发废弃砖粉固化重金属离子轻质保温材料,其特征在于:所述的废弃砖粉中二氧化硅含量≥50%,氧化铝含量≥10%,平均粒径≤80μm。
4.根据权利要求1所述的一种碱激发废弃砖粉固化重金属离子轻质保温材料,其特征在于:所述的重金属为干粉状态,其平均粒径≤80μm。
5.根据权利要求1所述的一种碱激发废弃砖粉固化重金属离子轻质保温材料,其特征在于:所述的3.5mol/L NaOH溶液,采用化学分析纯级NaOH配制。
6.根据权利要求1-5所述的一种碱激发废弃砖粉固化重金属离子轻质保温材料的制备方法,其特征在于包括以下步骤:
首先,称取废弃玻璃54-60份、废弃砖粉12-18份、重金属5-10份在搅拌器中干混,以100r/min速度慢搅2~3min;然后,将18-22份3.5mol/L NaOH溶液快速倒入搅拌器中,在100r/min速度下慢搅2min,接着在300r/min速度下快搅3min,其次,将上述配制的浆料浇筑在模具中并在湿度95%、温度30℃条件下养护3~4h;最后,将养护后的上述试块进行脱模,并在加热箱内升温至750~850℃烧结并保持1h。
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