CN117509801A - 一种利用固废钢渣处理矿山酸性废水的方法 - Google Patents
一种利用固废钢渣处理矿山酸性废水的方法 Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 39
- 239000002893 slag Substances 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 32
- 239000010959 steel Substances 0.000 title claims abstract description 32
- 239000002253 acid Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002910 solid waste Substances 0.000 title abstract description 6
- 230000002378 acidificating effect Effects 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 239000002440 industrial waste Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000010949 copper Substances 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 235000001465 calcium Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
本发明公开了一种利用固废钢渣处理矿山酸性废水的方法。本发明是将工业固废环保材料钢渣作为廉价处理剂用于处理矿山酸性废水,可以有效地中和酸性废水的pH和吸附废水中的重金属。本技术即可高效、简单、低成本的处理矿山酸性废水,还能回用工业废弃物钢渣,达到“以废治废”的效果。
Description
技术领域
本发明属于废水处理及废物资源化利用领域,涉及一种用炼钢废弃物——钢渣对矿山酸性废水的处理方法
背景技术
随着社会经济的不断发展,矿产资源已经成为人类生活必不可少的一部分。在矿产资源开发过程中难免会产生一些污染,而酸性矿山废水(AMD)是全球矿业面临的主要挑战之一。AMD主要是由于硫化矿物暴露于空气、水和微生物活动中发生氧化而产生的,其来源包括矿石和岩石废料堆、露天切割、尾矿坑、地下矿山以及酸性土壤等。AMD具有强酸性,pH值一般低于4,含有高浓度的重金属离子和硫酸盐。然而,排放未经处理的AMD有污染附近水源和动植物的风险,不仅对生物多样性造成不利影响,还造成土壤酸化进而到达食物链顶端,对人类身体健康带来危害。AMD的处理往往是复杂的、昂贵的,并且具有很大的挑战性,其处理费用因现场条件、废水的成分和处理方法而异。常见的处理方法,包括吸附法,膜分离法,离子交换法,中和法,硫化物沉淀法,硫酸盐还原菌法,人工湿地法。因此,根据矿山废水的特点,开发一种高效廉价的处理方法是很有意义的。
与其他材料相比,工业固废环保材料钢渣疏松多孔,比表面积大,具有一定的吸附能力,而钢渣密度大,在水中沉降速度快,易于固液分离。钢渣来源广泛是炼钢过程中的一种副产品,属于固体废物,主要组分均包括自由氧化钙、氧化镁、氧化铝、硅酸二钙、硅酸三钙、铁酸钙等,其中氧化钙、氧化镁、铁酸二钙和铁酸钙为钢渣的主要碱性物质。不仅可以释放大量的碱性物质,中和矿山酸性废水中的酸度,还可以吸附去除矿山酸性废水中的金属离子。因此,若能开发其作废水处理剂,不仅可以为废水处理,尤其是矿山酸性废水处理提供廉价、应用方便的中和吸附处理剂,而且可以“以废治废”。
发明内容
由于现有处理剂不能高效、廉价地解决矿山酸性废水pH低和重金属种类多含量高等问题,从而导致处理工艺复杂,处理成本高等一系列问题。本发明提供一种能对矿山酸性废水进行有效且经济的处理方法,以同时解决矿山酸性废水pH低和重金属种类多含量高等问题。
本发明的方法为:
将钢渣研磨,过筛后加入到矿山酸性废水中,在室温下进行搅拌反应,反应时间20min,当钢渣与矿山酸性废水的混合物料的pH到达6时,停止反应静置沉淀,获得固相和液相。
上述方法中,如获得的液相pH小于6,则继续添加钢渣,重复上述搅拌反应,直到反应结束后液相的pH大于等于6。
上述方法中获得的固相洗涤烘干后作为废渣运往渣场回收利用,液相排出。
上述的钢渣中氧化钙按质量百分比分30-50%,粒度为60-320目。
上述矿山酸性废水主要水质指标如下:pH:2-6,高硫酸盐,高铁,高铜,高锰等。
本发明的有益效果为:钢渣的主要矿物组成为硅酸三钙、硅酸二钙、钙镁橄榄石等,其中氧化钙含量30-50%,因此可以利用钢渣中和处理矿山酸性废水。同时钢渣表面粗糙且边缘不齐呈层叠结构的特点,可用于吸附矿山酸性废水中的重金属。本发明解决了矿山酸性废水不能低成本大规模消纳的技术与环保难题,又很好的会用了工业废弃物钢渣,达到了“以废治废”的效果。
钢渣对矿山酸性废水的中和效果很好,在5分钟内,pH能显著提高。同时在20分钟内对矿山酸性废水的重金属有显著的吸附作用。
整个中和吸附过程仅需20分钟
整个处理过程不需要认为调节废水pH值,处理效果稳定。
附图说明
图1不同投加量下矿山酸性废水pH的变化
图2不同投加量下矿山酸性废水Fe的变化
图3不同投加量下矿山酸性废水Cu的变化
具体实施方式
下面结合实施例对本发明做进一步的描述,但并不因此将本发明限制在所属的实施例范围之中。
实施例1
本发明选择安徽某矿区实际的酸性废水作为研究对象,将钢渣按照1,2,3,4,5g/L投加入矿山酸性废水中,搅拌20分钟,检测pH,铁和铜的含量。
由图1可知,投加钢渣后在5min时即可迅速提升pH,其后时间内投加量为1g/L和2g/L时pH在小范围波动变化,投加量为3g/L、4g/L和5g/L时pH逐渐提升。废水的初始pH为3.298,搅拌20min后,钢渣浓度在2g/L和3g/L时pH分别为4.959和5.918。由图2可知,投加钢渣后Fe含量波动变化,总趋势为含量降低。废水的初始Fe含量为212mg/L,在投加量为5g/L时Fe含量在20分钟降低到35mg/L。由图3可知,投加钢渣后Cu含量总趋势为降低,其中投加量为1g/L、2g/L和3g/L时Cu含量减小范围较小,投加量为4g/L和5g/L时Cu含量在5min时较小较大,其后时间变化范围不大。废水的初始Cu含量为14.1mg/L,在钢渣投加量为4g/L和5g/L Cu含量在20min内分别减少到3.2mg/L和2.7mg/L。
表1 酸性矿山废水主要污染物
Claims (3)
1.一种处理矿山酸性废水的方法,其特征在于:包括以下步骤:
(1)将钢渣研磨,过筛,并置于反应器中;
(2)将矿山酸性废水加入反应器中;
(3)使钢渣与矿山酸性废水充分混合
(4)固液分离,分离出废钢渣,得到处理出水。
2.根据权利要求1所述的方法,其特征在于:步骤(1)中,钢渣研磨后粒径小于300目。
3.根据权利要求1所述的方法,其特征在于:步骤(3)中,使用电动搅拌器搅拌均匀根据权利要求1所述的方法,其特征在于:步骤(4)中,使用沉淀分离的方法实现固液。
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