CN116082059A - 一种以全固废为原料的低密度发泡陶瓷的制备方法 - Google Patents
一种以全固废为原料的低密度发泡陶瓷的制备方法 Download PDFInfo
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Abstract
本发明公开了一种以全固废为原料的低密度发泡陶瓷的制备方法,原料各组份配比为:煤矸石15‑43%,河道底泥10‑30%,铁尾矿0‑50%,钢渣20‑40%,镍铁渣8-22%;将上述原料在球磨机中球磨至过200目筛,然后与发泡剂在混料机中混合得到坯料,于模具中压制成型,得到成型坯料;将成型坯料在1200‑1250℃下烧制,保温时间为30‑50min,最终得到密度195‑237kg/m3、导热系数0.055‑0.075W/(m·k)的低密度发泡陶瓷产品。本发明制备的发泡陶瓷产品具有密度低、保温隔热性能好等优点,为铁尾矿、钢渣、镍铁渣、河道底泥、煤矸石的大宗工业固废综合利用提供了新的途径,具有显著的经济、环境和社会效益。
Description
技术领域
本发明属于固体废弃物资源化利用领域,具体涉及一种新型硅钙基发泡陶瓷的制备的方法。
背景技术
发泡陶瓷具有质轻高强、吸水率和导热系数低、高气孔率及耐腐蚀等特点,发泡陶瓷材料已被用作建筑外墙保温板、轻质隔墙板、保温装饰一体板、化工管道和工业烟道保温材料,并积极向道路工程和海洋开发等领域拓展。
中国专利CN202210354676.5公布了一种以钒矿渣为主材制备发泡陶瓷的方法,以钒矿渣为主材,以调理剂为辅材经混合制粉、造粒、烧结工艺制备得到发泡陶瓷,采用高温发泡法,采用连续梯度烧结工艺:先以不大于5℃/min的速率升温至500℃并保温120min以上,然后以不大于3℃/min的速率升温至700℃并保温120min以上,再以不大于5℃/min的速率升温至1150℃~1250℃并保温180min以上。制备出发泡陶瓷制品干密度250-280kg/m3,导热系数0.06-0.1W/(MK),符合JG/T 511-2017《建筑用发泡陶瓷保温板》中二类产品要求。但是该方法的烧制时间长,能耗较大,不利于推广和应用。
中国专利CN202210304115.4公布一种基于石墨多源固废的发泡陶瓷制备方法,以石墨尾矿、采矿废石、剥离粘土为原料,添加辅助粘结剂和发泡剂经混合、湿磨、脱水、练泥、陈腐和干燥、烧结工艺制备发泡陶瓷,烧结温度1100-1200℃,保温时间30-90min。制备的发泡陶瓷480kg/m3≤密度≤540kg/m3,平均抗压强度≥7.0MPa,导热系数≤0.35W/(m·K),符合T/CBCSA12-2019《发泡陶瓷隔墙板》中对隔热保温材料的要求。该方法虽然实现高掺量固废的资源化利用,但依然还是有8-22%剥离粘土和0-15%辅助粘结剂(高岭土和/或长石)掺入,同时工艺较为复杂,特别是练泥工艺需要进行3-5次。
本发明以煤矸石、铁尾矿、河道底泥、镍铁渣为全部原料制备新型硅钙基发泡陶瓷材料,通过大量实验研发,不仅实现多种固废的协同处置,也拓宽发泡陶瓷材料的组分体系,缓解对高品质硅铝原料的依赖,极大地降低原料成本,提高经济效益。
发明内容
本发明的目的就是针对现有技术中存在的工艺复杂、烧制时间长、能耗高、成本高等问题,而提供一种以全固废为原料的低密度发泡陶瓷的制备方法,制备的发泡陶瓷有别于传统发泡陶瓷,属于新型发泡陶瓷,具有生产成本低,产品性能优良,从而为发泡陶瓷的制备提供了新途径。
为实现本发明的上述目的,本发明一种以全固废为原料的低密度发泡陶瓷的制备方法,采用以下工艺、步骤实施:
以全固废为原料的低密度发泡陶瓷的制备方法,其特征为在于包括如下步骤:
(1)以干重质量计量、称重、配比,原料各组份总质量按照100%计时配比为:煤矸石15-43%,河道底泥10-30%,铁尾矿0-50%,钢渣20-40%,镍铁渣8-22%;
(2)将上述原料分别进行干燥处理,使其含水率均低于1%,并将原料按配比混合后在球磨机中球磨至过200目筛,然后与发泡剂在混料机中混合得到坯料,备用;所述的发泡剂由碳化硅、经碳化秸秆粉混合而成,发泡剂加入量为步骤(1)之原料各组份总质量的0.2-0.5%;
(3)将步骤(2)得到的坯料布料于模具中压制成型,得到成型坯料;
(4)将成型坯料在1200-1250℃下烧制,保温时间为30-50min,最终得到密度195-237kg/m3、导热系数0.055-0.075W/(m·k)的低密度发泡陶瓷产品。
上述方案中,步骤(1)中原料各组份总质量按照100%计时配比优选为:煤矸石15-30%,河道底泥10-30%,铁尾矿10-28%,钢渣22-32%,镍铁渣8-22%。
上述方案中,发泡剂质量份数按照100份计时,碳化硅份数为30-60份,经碳化秸秆粉为40-70份。
进一步地,步骤(1)中所述煤矸石的化学组分按质量百分比为50%≤SiO2≤60%,5%≤Al2O3≤25%,0≤(CaO+MgO)≤5%。
进一步地,步骤(1)中所述河道底泥的化学组分按质量百分比为60%≤SiO2≤70%,5%≤Al2O3≤20%,0≤(CaO+MgO)≤5%。
进一步地,步骤(1)中所述铁尾矿的化学组分按质量百分比为50%≤SiO2≤60%,5%≤(CaO+MgO)≤10%,0≤Al2O3≤5%。
进一步地,步骤(1)中所述钢渣的化学组分按质量百分比为10%≤SiO2≤20%,40%≤CaO≤50%,5%≤(Al2O3+MgO)≤10%。
进一步地,步骤(1)中所述镍铁渣的化学组分按质量百分比为40%≤SiO2≤50%,17%≤MgO≤23%,5≤%(CaO+Al2O3)≤15%。
作为本发明技术方案的优选,所述的发泡剂呈粉末状,粒度过300目筛。
与现有技术相比,本发明一种以全固废为原料的低密度发泡陶瓷的制备方法具有以下积极效果:
(1)使用的原料包含煤矸石、河道底泥、铁尾矿、钢渣和镍铁渣等均为固废,可实现全固废的协同高值利用,为煤矸石、尾矿、河道底泥、钢渣及镍渣的大宗利用提供新途径,具有显著的经济、环境和社会效益。
(2)所制备的发泡陶瓷有别于传统硅铝发泡陶瓷,属于新型的硅钙基发泡陶瓷材料,该体系主要包含石英、辉石、钙长石等物相,具有较高的力学性能,发泡陶瓷的泡体具有良好的抗脆性。
(3)最终制备的发泡陶瓷产品密度低、保温隔热性能好的优点,密度仅为195-237kg/m3,导热系数仅为0.055-0.075W/(m·k),各项性能指标均满足JG/T 511-2017《建筑用发泡陶瓷保温板》中二类产品要求。
(4)发泡剂掺量低,仅为0.2-0.5wt%;保温时间短,仅为30-50分钟。
(5)本发明生产工艺简易,生产成本相对低廉,所得产品在市场上具有较强的竞争力。
附图说明
图1为本发明实施案例4制得的硅钙基发泡陶瓷烧结后的XRD图。
具体实施方式
为描述本发明,下面结合实施例对本发明一种以全固废为原料的低密度发泡陶瓷的制备方法做进一步详细说明。
在下面的描述中阐述了很多具体细节以便于充分理解本发明,但是本发明还可以采用其他不同于在此描述的其它方式来实施,本领域技术人员可以在不违背本发明内涵的情况下做类似推广,因此本发明不受下面公开的具体实施例的限制。
本发明一种以全固废为原料的低密度发泡陶瓷的制备方法按照以下步骤实施:
(1)原料干燥处理:将煤矸石、铁尾矿、河道底泥、钢渣和镍渣的原料分别烘干,使其含水率低于1%。
(2)原料研磨处理:全部原料按配比混合后在球磨至过200目筛,所得粉体,备用;
(3)原料配制:所述粉体按照干重质量百分比称量在混合机中得到发泡坯料,发泡坯料配比:煤矸石15-43%、铁尾矿0-50%、河道底泥10-35%、钢渣20-40%、镍铁渣8-22%,外掺发泡剂0.2-0.5%(碳化硅和/或经碳化的秸秆粉),发泡剂呈粉末状,粒度过300目筛;
(4)压制成型:将上述坯料布料于模具中,压制成型后烧制;
(5)烧制:将成型生坯于1200-1250℃烧制,保温时间30-50min,得到密度195-237kg/m3、导热系数0.055-0.075W/(m·k)的低密度发泡陶瓷产品。
实施例1-10采用的煤矸石、铁尾矿、河道底泥、钢渣和镍渣的主要化学组成如表1所示,具体原料配比与烧制温度如表2所示,未明确具体工艺参数,按上述步骤要求进行实施。所有实施例样品性能如表3所示,均满足JG/T 511-2017《建筑用发泡陶瓷保温板》中二类产品要求。
表1原料固废的主要化学组成
原料固废 | <![CDATA[SiO<sub>2</sub>]]> | CaO | <![CDATA[Al<sub>2</sub>O<sub>3</sub>]]> | MgO | <![CDATA[Fe<sub>2</sub>O<sub>3</sub>]]> |
煤矸石 | 50.86 | 3.03 | 24.88 | 0.73 | 13.13 |
河道底泥 | 64.42 | 3.10 | 18.94 | 1.53 | 5.92 |
铁尾矿 | 59.90 | 2.72 | 4.10 | 5.97 | 24.97 |
钢渣 | 13.01 | 44.66 | 2.10 | 4.01 | 26.28 |
镍铁渣 | 47.49 | 0.63 | 8.56 | 20.83 | 15.82 |
表2原料配比与烧制温度
表3低密度发泡陶瓷产品性能
由表3可以看出,实施例1-10制备的低密度发泡陶瓷产品的密度在195-237kg/m3、导热系数0.055-0.075W/(m·k),抗压强度在1.69-2.23MPa产品性能优良。特别是实施例6、7、8、9,制备的低密度发泡陶瓷产品的密度在195-206kg/m3、导热系数0.055-0.066W/(m·k),抗压强度在1.96-2.23MPa,取得了意想不到的技术效果。
图1为本发明实施案例4制得的硅钙基发泡陶瓷烧结后的XRD图。其它实施例制得的硅钙基发泡陶瓷烧结后的XRD图与图1类似。
由图1所示的本发明实施案例4制得的硅钙基发泡陶瓷烧结后的XRD图看出,XRD图显示其晶相为钙长石相、普通辉石相及石英相,其主晶相为钙长石相,表明所制备的发泡陶瓷属于新型硅钙基体系。
Claims (10)
1.一种以全固废为原料的低密度发泡陶瓷的制备方法,其特征为在于包括如下步骤:
(1)以干重质量计量、称重、配比,原料各组份总质量按照100%计时配比为:煤矸石15-43%,河道底泥10-30%,铁尾矿0-50%,钢渣20-40%,镍铁渣8-22%;
(2)将上述原料分别进行干燥处理,使其含水率均低于1%,并将原料按配比混合后在球磨机中球磨至过200目筛,然后与发泡剂在混料机中混合得到坯料,备用;所述的发泡剂由碳化硅、经碳化秸秆粉混合而成,发泡剂加入量为步骤(1)之原料各组份总质量的0.2-0.5%;
(3)将步骤(2)得到的坯料布料于模具中压制成型,得到成型坯料;
(4)将成型坯料在1200-1250℃下烧制,保温时间为30-50min,最终得到密度195-237kg/m3、导热系数0.055-0.075W/(m·k)的低密度发泡陶瓷产品。
2.如权利要求1所述的一种以全固废为原料的低密度发泡陶瓷的制备方法,其特征为在于:步骤(1)中,原料各组份总质量按照100%计时配比为:煤矸石15-30%,河道底泥10-30%,铁尾矿10-28%,钢渣22-32%,镍铁渣8-22%。
3.如权利要求1所述的一种以全固废为原料的低密度发泡陶瓷的制备方法,其特征为在于:发泡剂质量份数按照100份计时,碳化硅份数为30-60份,经碳化秸秆粉为40-70份。
4.如权利要求2所述的一种以全固废为原料的低密度发泡陶瓷的制备方法,其特征为在于:发泡剂质量份数按照100份计时,碳化硅份数为30-60份,经碳化秸秆粉为40-70份。
5.如权利要求1、2、3或4所述的一种以全固废为原料的低密度发泡陶瓷的制备方法,其特征为在于:步骤(1)中所述煤矸石的化学组分按质量百分比为50%≤SiO2≤60%,5%≤Al2O3≤25%,0≤
(CaO+MgO)≤5%。
6.如权利要求1、2、3或4所述的一种以全固废为原料的低密度发泡陶瓷的制备方法,其特征为在于:步骤(1)中所述河道底泥的化学组分按质量百分比为60%≤SiO2≤70%,5%≤Al2O3≤20%,0≤(CaO+MgO)≤5%。
7.如权利要求1、2、3或4所述的一种以全固废为原料的低密度发泡陶瓷的制备方法,其特征为在于:步骤(1)中所述铁尾矿的化学组分按质量百分比为50%≤SiO2≤60%,5%≤(CaO+MgO)≤10%,0≤Al2O3≤5%。
8.如权利要求1、2、3或4所述的一种以全固废为原料的低密度发泡陶瓷的制备方法,其特征为在于:步骤(1)中所述钢渣的化学组分按质量百分比为10%≤SiO2≤20%,40%≤CaO≤50%,5%≤
(Al2O3+MgO)≤10%。
9.如权利要求1、2、3或4所述的一种以全固废为原料的低密度发泡陶瓷的制备方法,其特征为在于:步骤(1)中所述镍铁渣的化学组分按质量百分比为40%≤SiO2≤50%,17%≤MgO≤23%,5≤%(CaO+Al2O3)≤15%。
10.如权利要求3或4所述的一种以全固废为原料的低密度发泡陶瓷的制备方法,其特征在于:所述煤矸石的化学组分按质量百分比为50%≤SiO2≤60%,5%≤Al2O3≤25%,0≤(CaO+MgO)≤5%;所述河道底泥的化学组分按质量百分比为60%≤SiO2≤70%,5%≤Al2O3≤20%,0≤(CaO+MgO)≤5%;所述铁尾矿的化学组分按质量百分比为50%≤SiO2≤60%,5%≤(CaO+MgO)≤10%,0≤Al2O3≤5%;所述钢渣的化学组分按质量百分比为10%≤SiO2≤20%,40%≤CaO≤50%,5%≤(Al2O3+MgO)≤10%;所述镍铁渣的化学组分按质量百分比为40%≤SiO2≤50%,17%≤MgO≤23%,5≤%(CaO+Al2O3)≤15%;所述的发泡剂呈粉末状,粒度过300目筛。
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