CN1778720A - 一种稀土生产中氯化铵废水零排放的处理方法 - Google Patents
一种稀土生产中氯化铵废水零排放的处理方法 Download PDFInfo
- Publication number
- CN1778720A CN1778720A CN 200410084484 CN200410084484A CN1778720A CN 1778720 A CN1778720 A CN 1778720A CN 200410084484 CN200410084484 CN 200410084484 CN 200410084484 A CN200410084484 A CN 200410084484A CN 1778720 A CN1778720 A CN 1778720A
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- Prior art keywords
- ammonium chloride
- water
- reverse osmosis
- concentration
- treatment
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- 239000002351 wastewater Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 20
- 229910052761 rare earth metals Inorganic materials 0.000 title claims abstract description 20
- 239000004259 Ammonium chloride Substances 0.000 title claims description 60
- 235000019270 ammonium chloride Nutrition 0.000 title claims description 60
- QDHHCQZDFGDHMP-UHFFFAOYSA-N monochloramine Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0nMS4wJyBlbmNvZGluZz0naXNvLTg4NTktMSc/Pgo8c3ZnIHZlcnNpb249JzEuMScgYmFzZVByb2ZpbGU9J2Z1bGwnCiAgICAgICAgICAgICAgeG1sbnM9J2h0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnJwogICAgICAgICAgICAgICAgICAgICAgeG1sbnM6cmRraXQ9J2h0dHA6Ly93d3cucmRraXQub3JnL3htbCcKICAgICAgICAgICAgICAgICAgICAgIHhtbG5zOnhsaW5rPSdodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rJwogICAgICAgICAgICAgICAgICB4bWw6c3BhY2U9J3ByZXNlcnZlJwp3aWR0aD0nODVweCcgaGVpZ2h0PSc4NXB4JyB2aWV3Qm94PScwIDAgODUgODUnPgo8IS0tIEVORCBPRiBIRUFERVIgLS0+CjxyZWN0IHN0eWxlPSdvcGFjaXR5OjEuMDtmaWxsOiNGRkZGRkY7c3Ryb2tlOm5vbmUnIHdpZHRoPSc4NScgaGVpZ2h0PSc4NScgeD0nMCcgeT0nMCc+IDwvcmVjdD4KPHBhdGggY2xhc3M9J2JvbmQtMCcgZD0nTSA2My4yMzk0LDQyIEwgNDcuODg4MSw0Micgc3R5bGU9J2ZpbGw6bm9uZTtmaWxsLXJ1bGU6ZXZlbm9kZDtzdHJva2U6IzVCQjc3MjtzdHJva2Utd2lkdGg6MnB4O3N0cm9rZS1saW5lY2FwOmJ1dHQ7c3Ryb2tlLWxpbmVqb2luOm1pdGVyO3N0cm9rZS1vcGFjaXR5OjEnIC8+CjxwYXRoIGNsYXNzPSdib25kLTAnIGQ9J00gNDcuODg4MSw0MiBMIDMyLjUzNjcsNDInIHN0eWxlPSdmaWxsOm5vbmU7ZmlsbC1ydWxlOmV2ZW5vZGQ7c3Ryb2tlOiM0Mjg0RjQ7c3Ryb2tlLXdpZHRoOjJweDtzdHJva2UtbGluZWNhcDpidXR0O3N0cm9rZS1saW5lam9pbjptaXRlcjtzdHJva2Utb3BhY2l0eToxJyAvPgo8dGV4dCBkb21pbmFudC1iYXNlbGluZT0iY2VudHJhbCIgdGV4dC1hbmNob3I9InN0YXJ0IiB4PSc2NC43NzQ1JyB5PSc0NC4zMDI3JyBzdHlsZT0nZm9udC1zaXplOjE1cHg7Zm9udC1zdHlsZTpub3JtYWw7Zm9udC13ZWlnaHQ6bm9ybWFsO2ZpbGwtb3BhY2l0eToxO3N0cm9rZTpub25lO2ZvbnQtZmFtaWx5OnNhbnMtc2VyaWY7ZmlsbDojNUJCNzcyJyA+PHRzcGFuPkNsPC90c3Bhbj48L3RleHQ+Cjx0ZXh0IGRvbWluYW50LWJhc2VsaW5lPSJjZW50cmFsIiB0ZXh0LWFuY2hvcj0iZW5kIiB4PSczMC44NDgxJyB5PSc0NC41MzMnIHN0eWxlPSdmb250LXNpemU6MTVweDtmb250LXN0eWxlOm5vcm1hbDtmb250LXdlaWdodDpub3JtYWw7ZmlsbC1vcGFjaXR5OjE7c3Ryb2tlOm5vbmU7Zm9udC1mYW1pbHk6c2Fucy1zZXJpZjtmaWxsOiM0Mjg0RjQnID48dHNwYW4+SDwvdHNwYW4+PHRzcGFuIHN0eWxlPSdiYXNlbGluZS1zaGlmdDpzdWI7Zm9udC1zaXplOjExLjI1cHg7Jz4yPC90c3Bhbj48dHNwYW4+TjwvdHNwYW4+PC90ZXh0Pgo8L3N2Zz4K ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 title claims description 60
- 238000006073 displacement reactions Methods 0.000 title claims description 8
- 238000000034 methods Methods 0.000 claims abstract description 39
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 20
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 13
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N ammonium hydroxide Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract 1
- 230000035515 penetration Effects 0.000 abstract 1
- 238000005516 engineering processes Methods 0.000 description 9
- 239000000460 chlorine Substances 0.000 description 8
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- 238000007599 discharging Methods 0.000 description 6
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- 238000010521 absorption reactions Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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- 238000004458 analytical methods Methods 0.000 description 2
- 239000008105 calcium carbonate Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound 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[Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 235000010216 calcium carbonate Nutrition 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 229910052500 inorganic minerals Inorganic materials 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 minerals Substances 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound 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[K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 239000011682 potassium carbonate Substances 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 281000010254 Secure Computing companies 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound 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- 239000004576 sand Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound 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[Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N sodium Chemical compound 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Abstract
Description
技术领域
本发明涉及铵的卤化物,以及工业废水处理及其资源的回收回用。具体地说是一种采用膜技术对氯化铵废水进行处理,回收氨水,并实现零排放的方法。
背景技术
目前,含氯化铵的废水的排放,在稀土工业以及离子交换法生产碳酸钾的生产过程中大量存在着,其浓度自0.1-10%不等。众所周知,含氯化铵的废水直接排放,使宝贵的水和氯化铵等化工原料白白流失,不仅造成了资源的严重浪费,也带来了严重污染,对人类生态环境构成严重威胁。而且废水中氯化铵浓度波动大、水量大、成份复杂,现有方法投入的处理成本较高。通常,离子交换法生产碳酸钾过程排出的废水中除含氯化铵外,还含有钾、钠、硫酸盐、硅、铁、砂粒杂质。而稀土工业生产的氯化铵废水成分还要复杂,除含氯化铵外,还含有硫酸盐,钙、镁离子,硅和少量乳化油有机物杂质。
申请号为99100015.3的中国专利申请文件中公开了一种“从含氯化铵的废液中回收氯化铵的方法”,采用了多效、热泵、真空蒸发的工艺与设备。该工艺采用的方法是多效真空蒸发析铵结晶。这类以固体氯化铵形式从含氯化铵的废水中回收氯化铵的方法,在回收氯化铵去掉大量水分的相变过程中,能耗就大:而且回收的固体氯化铵杂质含量高,利用价值低:用作化肥,长期使用会造成土壤盐碱化,用作化工原料,则因其纯度差,经济效益低;再则氯化铵溶液腐蚀性强,在提高温度和浓度条件下,对设备材料的要求很高,使得这些方法难以获得良好的应用前景。
发明内容
本发明旨在稀土生产中氯化铵回收的同时解决废水零排放,实现资源的回收回用问题。
本发明具体实践了膜分离技术在稀土生产中对于氯化铵废水零排放的应用,它基于:1、改变现有以固体氯化铵回收的方式,而采用对环境友好的膜分离技术,在常温、不发生相变的条件下进行有效分离和浓缩,在氯化铵溶液浓缩到浓度≥5-7%,而又未达到氯化铵结晶的浓度范围内,再用多级多效蒸发到氯化铵浓度10%,最终得到氨水,从而使能耗大幅度降低,也减轻了氯化铵溶液对设备的腐蚀,降低了生产成本,提高了生产效率。
2、回收与回用结合。利用蒸氨工艺直接回收到浓度为6mol/L以上纯度较高的氨水。氨水不仅利用价值较高,又是稀土工业的重要化工原料,可以回用于本稀土生产工艺。同时回收到的副产物是纯度较高的氯化钙,可用作建筑材料和电石原料、融雪剂。
3、本工艺流程通过透过液(水液)的回收回用,实现零排放。
本发明的稀土生产中氯化铵废水零排放的处理方法,其特征在于它包括以下的工艺步骤:1)、预处理将从萃取工艺后的工业废水输往原水箱进行常规的前净化处理:絮凝,沉降去杂,软化,除油,并进行精滤,使预处理水达到水质污染指数SDI≤5;2)、膜分离处理将上述符合要求的预处理水泵入反渗透装置进行多级连续脱盐和浓缩,使之氯化铵浓度达到5~8%w/w,排出的浓缩液返回原水箱,透过液分流回用;3)、在第一级反渗透装置脱盐与浓缩工艺中的两段之间设有一个由能量回收装置进行压力回收处理;4)、将经过多级反渗透装置的膜分离浓缩处理的氯化铵溶液,用蒸发装置作进一步浓缩处理,使溶液中的氯化铵浓度≥10%;5)、再将上述增浓的氯化铵溶液用蒸氨装置进行蒸氨处理,加入饱和的氢氧化钙溶液,反应后得到氯化钙副产品,和浓度≥6mol/L的氨水,氨水回收回用。
上述步骤2所述的第一、二级反渗透装置为多段复式结构,段间均设有节能用的能量回收装置。
上述步骤2所述的多级反渗透装置之后还设有一个用于提高水质的反渗透装置,输入端由高压泵接入,透过液分流回用。
本发明的积极效果是:1)、本发明处理工艺简单合理,有效地降低了设备造价。由于本发明采用在常温、无相变条件下就可以实现脱水浓缩氯化铵溶液的膜分离技术,所用的膜设备大部分为高分子有机材质,比较适用于处理氯化铵溶液,而且对氯化铵的浓度要求不高,因此对设备耐腐蚀性要求不苛刻,选材方便,使水处理设备造价大幅度降降低。
2)、节约能源。由于本发明的最终回收产物是氨水溶液,采用了常温、无相变条件下膜分离技术工艺,与产生相变的蒸馏浓缩法相比可以大幅度降低能耗,而后只需要蒸发到10%w/w的浓度就可以实现;在反渗透膜装置的浓缩氯化铵工艺中采用了能量回收装置,可将浓溶液的高压能量回收利用,从而使能耗进一步降低。
3)、回收产物突出。其最终回收的产物是氨水,其次是氯化钙。氨水应用价值远较固体氯化铵高得多,附加值高,其经济效益比较显著。
6)、回用效果明显。浓缩液回用,氨水回用,提高了处理氯化铵废水的价值。进一步考察,氯化铵废水处理后,其脱盐水回用率高,脱盐水浓度可以人工调节,排放水既可以用作自来水又可用作工业纯水利用,可以使50%以上的水得到回用。
7)、实现了氯化铵废水处理零排放。杂物杂质在步骤1的预处理中得到了有效地滤除,所以可以方便地回收氯化钙副产品,回收氨水可回用于本工艺,纯水回用,最终为零排放,便形成了一个清洁的生产工艺,大大地改善了生产环境,有利于环境保护。
附图说明
图1是膜分离法处理氯化铵废水零排放,回收氨水、氯化钙和水资源的工艺流程图。
图2是三段式的反渗透装置的工艺结构图具体实施方式参见附图。由工艺流程图所示的本发明实施例,对氯化铵废液进行资源化处理的工艺过程说明如下:首先,从入口in进入原水箱1的废水液(含氯化铵的废液)首先经过絮凝,多介质过滤器3和活性炭滤器4的过滤,二级精滤器6的精滤,除去悬浮物、微粒、乳化油等杂质净化之后达到第一级反渗透装置的进水要求,水质污染指数SDI≤5。
其次,经预处理精滤后,泵入第一级反渗透装置7、8,在压力1.6-5.0Mpa范围,水温5-45℃范围内,经过前后两段进行脱盐和浓缩。段间安装有能量回收装置N,作自动压力变换(其特点是不需要电能),使前段浓缩液中的压力能得到充分的利用。否则前段浓缩液一旦排入槽内,需要另用高压泵从槽内重新提升才能输往后段,这样做耗能颇大。如果段间直接串接则需另加提升泵才能实现。在此能量回收装置N起到了将浓缩液压力回收的作用。然后其透过水收集于一个中间水箱9中,待进一步处理。使其浓缩液氯化铵(NH4Cl)浓度达到1-3%w/w(按重量百分表示),再通过第二级高压泵P泵入第二级反渗透装置11,在压力4.0-8.0Mpa,水温5-45℃范围内进一步浓缩,使其浓度达到4-8%w/w,并放入浓缩水箱14。输出的透过液从图示I端返回萃取工艺回用。
从第二级反渗透装置的浓缩水箱14中排出的氯化铵浓缩液转入蒸发装置15作进一步蒸发,使氯化铵(NH4Cl)浓度增浓到10%以上。这里的蒸发工艺装置可以选多级多效闪蒸装置,低温多效蒸发装置,或者多效真空蒸发工艺装置。
然后,将上述增浓了的浓度在10%以上的氯化铵溶液通过蒸氨装置16(吸收塔),通入适量的蒸汽17(Steam)和饱和石灰乳18(Ca(OH)2)反应,蒸氨后获得的产物是:浓度为6mol以上的氨水19(NH4OH)和副产品氯化钙20(CaCl2),氨水可部分回用于本稀土工业生产的萃取工艺。产物回收从出口out引出。
流程中,由第一级和第二级反渗透装置的透过液继续通过高压泵P进入第三级反渗透装置12,在压力1.0-1.5Mpa,水温5-45℃范围内进行脱盐和浓缩,脱盐后的透过液氨氮指标NH3-N≤25mg/L,进入纯水箱13。第一、二级反渗透装置均可为多段复式结构,并在段间设置节能用的能量回收装置N。设置第三级反渗透装置是为了方便地提高透过液水质,符合工业废水排放规定氨氮指标NH3-N≤30mg/L的要求。纯水箱中的水液己达到自来水或初步纯水水质,所以该透过液可从图示II端返回本工艺适量回用,回用时转入原水箱1前的萃取工艺段,多余可回收或排放。同样,从第三级反渗透装置得到的浓缩液则可直接返回到原水箱1中,从E部位进入作循环处理。其中,第一级反渗透装置可采用针对苦咸水脱盐用膜装置,第二级反渗透装置可采用海水淡化用膜装置,第三级反渗透装置可采用苦咸水脱盐用膜装置或选用自来水脱盐用膜装置。反渗透装置的膜组件多为标准件:可以是中空纤维式,卷式、管式和板式,可以是抗污染膜,也可以是普通膜,其膜材质可以是聚酰胺等复合有机膜也可以是陶瓷膜或金属膜等无机膜。
图中,2、5是添加絮凝剂用的计量泵,用于控制絮凝剂的加入量,絮凝剂随杂质性质选择,用量随杂质含量调整。P表示流程中用于输运、提升用的压力泵。A、B、C、D为透过液的输送通路,A、B、C通往淡水箱11,D直接通往纯水箱13。
图2所示三段式反渗透装置的工艺结构原理图,段间均设有能量回收装置N。P是补充压力用辅设的小功率压力泵。需要时可在第一级、第二级都配置为二段或二段以上的多段复式结构的反渗透装置。
实施例1:本例的工艺装置及流程如图1所示。将上述稀土矿氯化铵废水先进行净化预处理,取5吨水液(其废水取样成分见表1)输入原水箱1经絮凝、在多介质过滤器3中过滤去杂,活性碳滤器4中吸附过滤,出水的水质污染指数SDI≤4.8。絮凝剂选用聚丙烯酰胺经过二级精滤器6过滤,去除杂质。接着泵入第一级反渗透装置7、8,在压力3.2Mpa,水温15℃进行脱盐和浓缩,这里是8″卷式复合膜反渗透苦咸水淡化装置,其结构为复式的反渗透装置,复式结构段设为前、后二段,也可以设二段以上,在其段间设置节能用的能量回收装置N。从能量回收器N出来的浓缩液收集到一个中间水箱9中,浓缩液浓度为2.8%w/w。再通过第二级高压泵P泵入第二级反渗透装置10,这一级采用了4″卷式复合膜海水淡化反渗透装置,在压力7.8Mpa,水温18℃条件下进一步浓缩。浓缩液浓度为6.1%w/w,放入到浓缩水箱14中,而后导向最终提取产物的工艺段;同时,从第一级和第二级反渗透装置流出的透过液由A、B、C通道分流放入淡水箱11中,通过高压泵增压、再进入第三级反渗透装置,作进一步处理,透过液由D直接通往纯水箱13中去,浓缩液由E通道回用。第三级采用4″低压卷式复合膜反渗透装置12,在压力1.25Mpa,水温21℃条件下进行脱盐和浓缩,脱盐后的透过液进入纯水箱13,其NH3-N含量为18mg/L。其脱盐后的透过液量达到4.5吨,回用于生产工艺,浓缩液0.5吨则返回到原废水1进行循环处理。第一级反渗透装置后面的段间安装有一个能量回收装置N(美国能源回收公司的HTC系列产品)。
表1江西某稀土厂NH4Cl废水取样成分
经上述反渗透装置浓缩过的、从浓缩水箱14导出的氯化铵溶液通过一个蒸发装置15(即三效闪蒸装置)进一步浓缩,其氯化铵增浓到10.2%w/w。然后泵入到一个蒸氨装置16,并往罐内通入适量蒸汽17(Steam)和与NH4Cl等摩尔的饱和石灰乳18(Ca(OH)2)溶液,得到6.2mol/L浓度的氨水70升和副产物氯化钙溶液0.5吨。氨水可回用于生产工艺,或用作其它用途。无废液排放。
实施例2:
西北某稀土公司产出的氯化铵废水经化学沉降、软化、过滤、活性炭吸附后,水质分析报告见表2。
表2包头某稀土厂NH4Cl废水取样成分
预处理方法同例1。在入口水温31.5℃,操作压力5.0Mpa下,采用2.5″膜组件,其余工艺流程同例1。参见图2。第三级反渗透装置的透过液通量400mL/min时,浓缩液氯化铵浓度68046.2mg/L,透过液浓度16mg/L。将上述反渗透浓缩过的氯化铵浓液通过溶液,蒸氨,得到6.2mol/L浓度的氨水。
实施例3:表3西北某稀土厂氯化铵废水取样成分
西北某稀土厂产出的氯化铵废水经如例2类似的化学沉降、软化、过滤、活性碳吸附后,水质分析报告见表3。
在入口水温36.5℃,操作压力6.5Mpa下,采用2.5″膜组件,工艺流程同例1,第三级反渗透装置的透过液通量560mL/min时,浓缩液浓度83312mg/L,透过液浓度18mg/L。将上述反渗透浓缩过的氯化铵溶液通过三效蒸发装置,将其增浓到11%后,通过蒸氨吸收塔,加入饱和Ca(OH)2溶液,蒸氨,得到6.5mol/L浓度的氨水。无废液排放。
本发明的处理方法还适用于化肥厂的氯化铵废水的处理。
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