CN107473763B - 一种污水过滤用磷石膏陶粒及其制备方法 - Google Patents
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Abstract
本发明涉及用于污水过滤的陶粒技术领域,尤其是一种污水过滤用磷石膏陶粒及其制备方法,经过将磷石膏制备成磷石膏粉,将粘土经过改性制备成粘土粉,将页岩与硫化亚铁、三氧化二铝相互作用后,制备成页岩粉,并将磷石膏粉、粘土粉、页岩粉进行合理的配比设计,使得磷石膏的利用量较多,粘土、页岩的利用量较低,减少了对自然资源的消耗,实现了对磷化工废弃物的有效利用,降低了成本。
Description
技术领域
本发明涉及用于污水过滤的陶粒技术领域,尤其是一种污水过滤用磷石膏陶粒及其制备方法。
背景技术
随着工业的快速发展,污水排放量越来越多;随着污水的排放,导致众多有害元素或者微生物进入生物链,使得对动植物以及人类带来严重的危害,因此,对于污水进行净化处理至一定标准后,再排放,是当前环保部门严格要求的。
陶粒为污水处理过程中,较为廉价的原料产品,被广泛应用于污水处理领域,实现污水的净化处理。但是,现有技术中,陶粒一般采用烧结法和免烧法制备,而烧结法制备陶粒已成为当前最成熟的工艺,可是其制备陶粒的工艺较为复杂,成本高;而免烧法虽然避免了高温烧结处理,其对于原料要求比较高,不容易形成高强度、低密度的轻质陶粒。
基于此,对于陶粒的制备,一直着眼于对陶粒的制备的成本以及陶粒抗压强度和低密度方面进行研究,但都未取得较大的突破,使得陶粒的堆积密度保持在600kg/m3以上,筒压强度在5MPa以下,极大程度的影响着陶粒产品的品质,以及陶粒产品在污水处理方面应用的周期。
磷石膏是磷化工产业产出的固体废弃物,其具有轻质等特征,但由于磷石膏可塑性极差,导致磷石膏在各个领域的应用量较少,如有研究者将磷石膏应用于陶粒制备领域,可并未将磷石膏直接作为主要原料来进行陶粒的制备,而是将其作为少量添加在陶粒主原料中,并经过造粒成型,养护或者烧结等方式获得陶粒。可见,对于现有技术中,陶粒制备过程中,难以大量利用磷石膏作为原料来生产,使得对于磷化工产生的大量固体废弃物的堆存量难以得到缓解。
鉴于此,本研究者在考虑陶粒制备成本以及陶粒密度、抗压强度等综合性能的基础上,将磷石膏作为陶粒制备的主要原料,并添加其他辅料,使得制备的陶粒产品性能较佳,能够用于对污水净化处理,降低污水中有害成分的含量,为用于污水处理的陶粒生产提供一种新思路。
发明内容
为了解决现有技术中存在的上述技术问题,本发明提供一种污水过滤用磷石膏陶粒及其制备方法。
具体是通过以下技术方案得以实现的:
一种污水过滤用磷石膏陶粒制备方法,包括以下步骤:
(1)将磷石膏烘干至恒重,并研磨成粉末,过80目筛,得磷石膏粉;
(2)将粘土与三聚磷酸钠按照质量比为1:0.2-0.5混合,并研磨,过80目筛,得粘土粉;
(3)将硫化亚铁与三氧化二铝按照质量比为1:1混合,并添加硫化亚铁质量3-7倍的页岩,研磨,过80目筛,得到页岩粉;
(4)将磷石膏粉、粘土粉、页岩粉按照质量比为8-10:0.4-0.8:1-3混合,拌匀,加水,送入造粒机造粒成型,烧制,即得。
所述的步骤(4),磷石膏粉、粘土粉、页岩粉按照质量比为9:0.5:2混合。
所述的步骤(2),粘土与三聚磷酸钠按照质量比为1:0.3混合。
所述的步骤(3),页岩添加量为硫化亚铁质量的6倍。
所述的加水,水料质量比为0.1~0.9。
所述的成型,颗粒粒径为5-25mm。
所述的烧制,是先预热至100℃,再在3min升温至200℃,恒温3min,再在20min升温至1200℃,恒温0.5-1h,在3h降温至常温,即可。
上述的污水过滤用磷石膏陶粒制备方法制备的污水过滤用磷石膏陶粒,堆积密度为365~483kg/m3,筒压强度为12.1~14.6MPa,1h吸水率为4~9%,盐酸可溶率约为0.8%。
本发明创造的陶粒经过静态吸附试验表明:该陶粒对水中TP的饱和吸附量达到920~990mg/kg,具有较优的吸附除磷效果,能够广泛应用于磷化工污水中的除磷处理。
与现有技术相比,本发明创造的技术效果体现在:
经过将磷石膏制备成磷石膏粉,将粘土经过改性制备成粘土粉,将页岩与硫化亚铁、三氧化二铝相互作用后,制备成页岩粉,并将磷石膏粉、粘土粉、页岩粉进行合理的配比设计,使得磷石膏的利用量较多,粘土、页岩的利用量较低,减少了对自然资源的消耗,实现了对磷化工废弃物的有效利用,降低了成本。
结合将粘土采用三聚磷酸钠进行改性处理,并结合页岩采用硫化亚铁、三氧化二铝进行处理,使得陶粒的结构稳定,并且在烧制过程中,促进孔隙的形成,提高陶粒的孔隙率,增强吸附能力和交换能力,实现对水质的改善功能,提高陶粒的抗压强度,降低堆密度。
经过成型烧结处理,结合原料成分的选择,使得形成大量的钙基无机盐,提高了对水中磷酸盐的去除能力;而且,经过粘土、页岩、磷石膏的合理配比设计,使得陶粒抗压强度较高,而且堆积密度较低,能够长期承受污水冲刷的负荷,延长净化水的周期,降低污水处理成本。
具体实施方式
下面结合具体的实施方式来对本发明的技术方案做进一步的限定,但要求保护的范围不仅局限于所作的描述。
磷石膏主要成分含量为:硫酸钙55-68%,二氧化硅11-20%,三氧化二铝2-5%,三氧二铁1-4%。
粘土主要成分含量为:二氧化硅60.1-60.5%,三氧化二铝11.2-13.5%,三氧化二铁3.8-4.2%,氧化钙5-6%,氧化镁2-3%,氧化钠0.1-0.3%,氧化钾0.2-0.5%。
实施例1
污水过滤用磷石膏陶粒制备方法,包括以下步骤:
(1)将磷石膏烘干至恒重,并研磨成粉末,过80目筛,得磷石膏粉;
(2)将粘土与三聚磷酸钠按照质量比为1:0.2混合,并研磨,过80目筛,得粘土粉;
(3)将硫化亚铁与三氧化二铝按照质量比为1:1混合,并添加硫化亚铁质量3倍的页岩,研磨,过80目筛,得到页岩粉;
(4)将磷石膏粉、粘土粉、页岩粉按照质量比为8:0.4:1混合,拌匀,加水,水料质量比为0.1,送入造粒机造粒成型,烧制,即得。
所述的成型,颗粒粒径为5mm。
所述的烧制,是先预热至100℃,再在3min升温至200℃,恒温3min,再在20min升温至1200℃,恒温0.5h,在3h降温至常温。
实施例2
污水过滤用磷石膏陶粒制备方法,包括以下步骤:
(1)将磷石膏烘干至恒重,并研磨成粉末,过80目筛,得磷石膏粉;
(2)将粘土与三聚磷酸钠按照质量比为1:0.5混合,并研磨,过80目筛,得粘土粉;
(3)将硫化亚铁与三氧化二铝按照质量比为1:1混合,并添加硫化亚铁质量7倍的页岩,研磨,过80目筛,得到页岩粉;
(4)将磷石膏粉、粘土粉、页岩粉按照质量比为10:0.8:3混合,拌匀,加水,水料质量比为0.9,送入造粒机造粒成型,烧制,即得。
所述的成型,颗粒粒径为25mm。
所述的烧制,是先预热至100℃,再在3min升温至200℃,恒温3min,再在20min升温至1200℃,恒温1h,在3h降温至常温。
实施例3
污水过滤用磷石膏陶粒制备方法,包括以下步骤:
(1)将磷石膏烘干至恒重,并研磨成粉末,过80目筛,得磷石膏粉;
(2)将粘土与三聚磷酸钠按照质量比为1:0.3混合,并研磨,过80目筛,得粘土粉;
(3)将硫化亚铁与三氧化二铝按照质量比为1:1混合,并添加硫化亚铁质量6倍的页岩,研磨,过80目筛,得到页岩粉;
(4)将磷石膏粉、粘土粉、页岩粉按照质量比为9:0.5:2混合,拌匀,加水,水料质量比为0.5,送入造粒机造粒成型,烧制,即得。
所述的成型,颗粒粒径为15mm。
所述的烧制,是先预热至100℃,再在3min升温至200℃,恒温3min,再在20min升温至1200℃,恒温0.8h,在3h降温至常温。
实施例4
污水过滤用磷石膏陶粒制备方法,包括以下步骤:
(1)将磷石膏烘干至恒重,并研磨成粉末,过80目筛,得磷石膏粉;
(2)将粘土与三聚磷酸钠按照质量比为1:0.4混合,并研磨,过80目筛,得粘土粉;
(3)将硫化亚铁与三氧化二铝按照质量比为1:1混合,并添加硫化亚铁质量4倍的页岩,研磨,过80目筛,得到页岩粉;
(4)将磷石膏粉、粘土粉、页岩粉按照质量比为8:0.8:2混合,拌匀,加水,水料质量比为0.3,送入造粒机造粒成型,烧制,即得。
所述的成型,颗粒粒径为8mm。
所述的烧制,是先预热至100℃,再在3min升温至200℃,恒温3min,再在20min升温至1200℃,恒温0.9h,在3h降温至常温。
实施例5
在实施例1的基础上,直接采用磷石膏、粘土、页岩混合后研磨成粉末,造粒机造粒成型,烧制而成。
实施例6
在实施例2的基础上,采用磷石膏、粘土以及步骤(3)得到的页岩粉进行混合后,造粒机造粒成型,烧制而成。
对实施例1-6制备的陶粒进行堆积密度、筒压强度、1h吸水率、盐酸可溶率以及对污水中的TP去除情况进行检测,结果如下表1所示:
表1
堆积密度kg/m<sup>3</sup> | 筒压强度MPa | 1h吸水率% | 盐酸可溶率% | TP去除mg/kg | |
实施例1 | 451 | 13.8 | 8 | 0.81 | 950 |
实施例2 | 367 | 12.8 | 5 | 0.79 | 918 |
实施例3 | 398 | 12.7 | 7 | 0.82 | 940 |
实施例4 | 435 | 14.6 | 4 | 0.80 | 979 |
实施例5 | 725 | 8.7 | 16 | 1.57 | 580 |
实施例6 | 586 | 9.1 | 21 | 0.86 | 720 |
由表2的数据显示,本发明创造的陶粒性能较优,能够充分去除污水中的TP,脱除磷的能力较强。
本发明创造中采用的污水,其水质(部分指标)为COD=5000mg/L,TP=8mg/L,NH4+-N=83mg/L。
Claims (3)
1.一种污水过滤用磷石膏陶粒制备方法,其特征在于,包括以下步骤:
(1)将磷石膏烘干至恒重,并研磨成粉末,过80目筛,得磷石膏粉;
(2)将粘土与三聚磷酸钠按照质量比为1:0.3混合,并研磨,过80目筛,得粘土粉;
(3)将硫化亚铁与三氧化二铝按照质量比为1:1混合,并添加硫化亚铁质量6倍的页岩,研磨,过80目筛,得到页岩粉;
(4)将磷石膏粉、粘土粉、页岩粉按照质量比为9:0.5:2混合,拌匀,加水,送入造粒机造粒成型,烧制,即得;
所述的加水,水料质量比为0.1~0.9;
所述的成型,颗粒粒径为5-25mm;
所述的烧制,是先预热至100℃,再在3min升温至200℃,恒温 3min,再在20min升温至1200℃,恒温0.5-1h,在3h降温至常温,即可。
2.如权利要求1所述的污水过滤用磷石膏陶粒制备方法制备的污水过滤用磷石膏陶粒。
3.如权利要求1污水过滤用磷石膏陶粒制备方法,其特征在于,所述污水过滤用磷石膏陶粒堆积密度为365~483kg/m3,筒压强度为12.1~14.6MPa,1h吸水率为4~9%,盐酸可溶率为0.8%。
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