CN1792893A - Process for resoursefullizing treating of chemical cleaning waste water of electroplating second product - Google Patents
Process for resoursefullizing treating of chemical cleaning waste water of electroplating second product Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004140 cleaning Methods 0.000 title claims abstract description 32
- 239000000126 substance Substances 0.000 title claims abstract description 32
- 238000009713 electroplating Methods 0.000 title claims abstract description 29
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 36
- 239000000047 product Substances 0.000 claims abstract description 22
- ONMOULMPIIOVTQ-UHFFFAOYSA-N 98-47-5 Chemical compound OS(=O)(=O)C1=CC=CC([N+]([O-])=O)=C1 ONMOULMPIIOVTQ-UHFFFAOYSA-N 0.000 claims abstract description 21
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 claims abstract description 17
- 239000000706 filtrate Substances 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000002244 precipitate Substances 0.000 claims abstract description 11
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 9
- 238000003916 acid precipitation Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims abstract 3
- 239000000243 solution Substances 0.000 claims description 39
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims description 8
- 238000007747 plating Methods 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 239000012670 alkaline solution Substances 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000010977 jade Substances 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- 230000002950 deficient Effects 0.000 abstract description 17
- 238000001556 precipitation Methods 0.000 abstract description 15
- 238000011282 treatment Methods 0.000 abstract description 14
- 239000007788 liquid Substances 0.000 abstract description 8
- 239000010842 industrial wastewater Substances 0.000 abstract description 5
- 239000003513 alkali Substances 0.000 abstract description 4
- 231100000331 toxic Toxicity 0.000 abstract description 4
- 230000002588 toxic effect Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 231100000086 high toxicity Toxicity 0.000 abstract description 3
- 239000002440 industrial waste Substances 0.000 abstract description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 239000007789 gas Substances 0.000 description 8
- 238000004064 recycling Methods 0.000 description 8
- 239000002699 waste material Substances 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- ONMOULMPIIOVTQ-UHFFFAOYSA-M 3-Nitrobenzene sulphonate Chemical compound [O-][N+](=O)C1=CC=CC(S([O-])(=O)=O)=C1 ONMOULMPIIOVTQ-UHFFFAOYSA-M 0.000 description 3
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910001453 nickel ion Inorganic materials 0.000 description 3
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 2
- 229910001431 copper ion Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- LJRGBERXYNQPJI-UHFFFAOYSA-M sodium;3-nitrobenzenesulfonate Chemical compound [Na+].[O-][N+](=O)C1=CC=CC(S([O-])(=O)=O)=C1 LJRGBERXYNQPJI-UHFFFAOYSA-M 0.000 description 1
- 239000010891 toxic waste Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
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Abstract
本发明属于工业废液资源化处理技术领域，公开了一种高浓度高污染有毒难降解高碱性电镀次品镀件化学清洗废水的资源化处理方法。该方法包括如下步骤：在电镀次品镀件化学清洗废水中加入酸溶液，调节废水样的pH为1～7，搅拌均匀，在20～110℃下加热，使HCN气体逸出并用氢氧化钾溶液或氢氧化钠溶液吸收，同时回收析出的间硝基苯磺酸沉淀；在回收HCN和间硝基苯磺酸后的滤液中加入碱溶液，调节滤液pH至9～14，并不断搅拌，使溶液中产生氢氧化镍沉淀，至沉淀完全后，静置，过滤，回收氢氧化镍沉淀。本发明操作简单，该方法应用于高浓度高毒性的电镀工业废水资源化处理，产生良好的环境效益并可获得更好的经济效益。The invention belongs to the technical field of resource treatment of industrial waste liquid, and discloses a method for resource treatment of waste water from chemical cleaning of high-concentration, high-pollution, toxic, refractory and high-alkaline electroplating defective products. The method comprises the following steps: adding an acid solution to the chemical cleaning waste water of electroplating defective products, adjusting the pH of the waste water sample to be 1-7, stirring evenly, heating at 20-110° C. to escape the HCN gas and using potassium hydroxide solution or sodium hydroxide solution, and recover the precipitated m-nitrobenzenesulfonic acid precipitation; add alkali solution to the filtrate after recovering HCN and m-nitrobenzenesulfonic acid, adjust the pH of the filtrate to 9-14, and keep stirring, Make nickel hydroxide precipitate in the solution, after the precipitation is complete, let it stand, filter, and reclaim the nickel hydroxide precipitate. The operation of the invention is simple, and the method is applied to resource treatment of high-concentration and high-toxicity electroplating industrial wastewater, which produces good environmental benefits and can obtain better economic benefits.
Description
技术领域Technical field
本发明属于工业废液资源化处理技术领域，特别涉及一种高浓度高污染有毒难降解高碱性电镀次品镀件化学清洗废水的资源化处理方法。The invention belongs to the technical field of resource treatment of industrial waste liquid, and in particular relates to a resource treatment method for chemical cleaning wastewater of high-concentration, high-pollution, toxic, refractory and high-alkaline electroplating defective products.
背景技术 Background technique
高浓度高毒性的电镀工业废水是采用以氰化钠、间硝基苯磺酸钠和氢氧化钠等组成的混合液，对电镀过程中产生的镀件次品表面的金属镀层进行化学清洗并回收柸件时，产生的高浓度高污染难降解工业废水。该废水含有浓度较高的重金属镍、氰化物、间硝基苯磺酸盐以及氢氧化钠等，而且在高碱性的条件下，镍离子和废液中的氰根、间硝基苯磺酸根形成复杂的络合物，具有化学性质稳定、成份复杂、污染物浓度高和毒性非常强的特点。该类电镀废水的处理，依靠现有的一般物化混凝法、生物法、氧化还原法、催化氧化法、化学沉淀法等废水处理方法，均无法达到较好的处理效果，是目前电镀行业中最难处理或尚未找到有效处理方法的一种高污染电镀工业废水。The high-concentration and highly toxic electroplating industrial wastewater uses a mixed solution composed of sodium cyanide, sodium m-nitrobenzenesulfonate and sodium hydroxide to chemically clean the metal coating on the surface of the defective plating produced during the electroplating process and remove it. When recycling stacks, the high concentration and high pollution produced is difficult to degrade industrial wastewater. The wastewater contains high concentrations of heavy metal nickel, cyanide, m-nitrobenzenesulfonate and sodium hydroxide, etc., and under high alkaline conditions, nickel ions and cyanide and m-nitrobenzenesulfonate in the waste Acid radicals form complex complexes, which have the characteristics of stable chemical properties, complex components, high concentration of pollutants and very strong toxicity. The treatment of this type of electroplating wastewater relies on the existing general physical and chemical coagulation method, biological method, redox method, catalytic oxidation method, chemical precipitation method and other wastewater treatment methods, all of which cannot achieve good treatment effects. It is a highly polluting electroplating industrial wastewater that is the most difficult to treat or has not yet found an effective treatment method.
采取的化学清洗工艺的不同，清洗过程中产生的废液成分与性质也相差很大，治理难易也相差很大。近年来，国内比较常用的工艺有：硝酸法、氰化物混合液法等。硝酸法废液中除了含有较高浓度的铜离子、镍离子之外，还含有游离硝酸和硝酸根，处理该类废水比较前沿的办法是用蒸馏法回收废液中的硝酸；对剩余的含有高浓度铜离子、镍离子的溶液，采用P507煤油体系萃取分离提取废液中的铜，最后用氢氧化物沉淀法分离提取萃取液中的镍；而氰化物法的产生氰化物混合液废水，目前对这种废液的处理并没有特别有效的办法，给环境造成很大的影响，这种废水采用现有的生化法和物化法进行处理时，难以达到预期的处理目的，给环境造成了很大的影响，也增加了企业的成本，造成不必要的浪费。Depending on the chemical cleaning process adopted, the components and properties of the waste liquid produced during the cleaning process also vary greatly, and the difficulty of treatment also varies greatly. In recent years, the more commonly used processes in China are: nitric acid method, cyanide mixed solution method, etc. In addition to high concentrations of copper ions and nickel ions, the nitric acid waste liquid also contains free nitric acid and nitrate radicals. The most advanced way to deal with this type of waste water is to recover the nitric acid in the waste liquid by distillation; For the solution of high-concentration copper ions and nickel ions, use P507 kerosene system to extract and separate the copper in the waste liquid, and finally use the hydroxide precipitation method to separate and extract the nickel in the extract; while the cyanide method produces cyanide mixed liquid wastewater, At present, there is no particularly effective method for the treatment of this waste liquid, which has caused a great impact on the environment. When this waste water is treated by the existing biochemical and physical chemical methods, it is difficult to achieve the expected treatment purpose, which has caused serious damage to the environment. It has a great impact and also increases the cost of the enterprise, causing unnecessary waste.
发明内容Contents of Invention
为了解决上述现有技术中存在的不足之处，本发明的目的在于提供一种新型的资源化处理高污染高毒性电镀次品镀件化学清洗废水的方法，该方法可产生良好的环境效益及经济效益。In order to solve the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a novel resource-based method for the chemical cleaning wastewater of highly polluted and highly toxic electroplating defective products, which can produce good environmental benefits and economic benefits.
本发明是将该类高浓度高毒性电镀工业废水进行资源化处理，即通过中和、酸化、碱性氯化等过程处理，以达到处理废水与回收废水中有用物质的目的方法。该方法可用于电镀镀件次品表面金属镀层化学清洗过程中产生的高浓度高污染有毒废水的净化回收处理。The present invention is a resource treatment of such high-concentration and high-toxicity electroplating industrial wastewater, that is, through neutralization, acidification, alkaline chlorination and other processes, so as to achieve the purpose of treating wastewater and recovering useful substances in wastewater. The method can be used for the purification, recovery and treatment of high-concentration, high-pollution and toxic waste water produced during the chemical cleaning process of the metal coating on the surface of defective electroplated parts.
本发明的目的通过下述技术方案实现：所述电镀次品镀件化学清洗废水资源化处理方法，包括如下步骤：The purpose of the present invention is achieved through the following technical solutions: the chemical cleaning wastewater treatment method for defective electroplating products comprises the following steps:
(1)在电镀次品镀件化学清洗废水中加入酸溶液，调节废水样的pH为1～7，搅拌均匀，在20～110℃下加热，使HCN气体逸出并用氢氧化钾溶液或氢氧化钠溶液吸收，同时，回收析出的间硝基苯磺酸沉淀；(1) Add acid solution to the chemical cleaning wastewater of defective electroplating products, adjust the pH of the wastewater sample to 1-7, stir evenly, heat at 20-110°C to let HCN gas escape and use potassium hydroxide solution or hydrogen The sodium oxide solution is absorbed, and meanwhile, the m-nitrobenzenesulfonic acid precipitation that separates out is reclaimed;
(2)在步骤(1)回收HCN和间硝基苯磺酸后的滤液中加入碱溶液，调节滤液pH至9～14，并不断搅拌，使溶液中产生氢氧化镍沉淀，至沉淀完全后，静置，过滤，回收氢氧化镍沉淀。(2) add alkaline solution in the filtrate after step (1) reclaims HCN and m-nitrobenzenesulfonic acid, adjust filtrate pH to 9～14, and constantly stir, make nickel hydroxide precipitate in the solution, after the precipitation is complete , stand still, filter, reclaim nickel hydroxide precipitate.
为了更好地实现本发明，所述步骤(1)中调节废水样的pH为2～3，废水样优选在40～90℃下加热，酸溶液为硫酸或盐酸、磷酸、硝酸等酸溶液。In order to better realize the present invention, in the step (1), the pH of the wastewater sample is adjusted to be 2-3, the wastewater sample is preferably heated at 40-90° C., and the acid solution is sulfuric acid or hydrochloric acid, phosphoric acid, nitric acid and other acid solutions.
所述步骤(2)中碱溶液为可溶性强碱溶液，包括氢氧化钾溶液、氢氧化钠溶液或者其它可溶性强碱溶液。The alkali solution in the step (2) is a soluble strong alkali solution, including potassium hydroxide solution, sodium hydroxide solution or other soluble strong alkali solutions.
所述处理后的镀件化学清洗废水的出水与回收的氰化物、间硝基苯璜酸混匀，循环用于次品镀件的化学清洗。The effluent of the treated plating piece chemical cleaning wastewater is mixed with recovered cyanide and m-nitrobenzenesulfonic acid, and recycled for chemical cleaning of defective plated pieces.
本发明具有如下优点和效果：本发明提供了一种新型的资源化处理高浓度高污染的电镀次品镀件表面金属镀层化学清洗废水的方法，该方法操作简单，在实际的电镀废水资源化处理中推广应用，产生良好的环境效益的同时，可获得更好的经济效益。The present invention has the following advantages and effects: the present invention provides a novel resource-based method for treating high-concentration and highly-polluted electroplating defective product surface metal plating chemical cleaning wastewater, the method is simple to operate, and can be used in actual electroplating wastewater recycling It can be popularized and applied in the process of processing, and while producing good environmental benefits, better economic benefits can be obtained.
(1)本发明对高浓度高毒性的电镀次品镀件表面金属镀层化学清洗废水的处理，包括氰的回收、间硝基苯璜酸的回收、镍的回收、出水循环使用等处理流程。(1) The present invention's treatment of high-concentration and high-toxicity electroplating defective product surface metal coating chemical cleaning wastewater includes the recovery of cyanide, the recovery of m-nitrobenzenesulfonic acid, the recovery of nickel, and the recycling of effluent.
(2)本发明对氰的回收：加入硫酸或盐酸等强酸的溶液，调节废水的pH值至1～7，使废水中的CN-生成HCN气体，在20～110℃下加热使HCN逸出并回收。(2) The recovery of cyanide in the present invention: add a solution of strong acids such as sulfuric acid or hydrochloric acid, adjust the pH value of the waste water to 1-7, make the CN in the waste water generate HCN gas, and heat at 20-110° C. to escape the HCN And recycle.
(3)本发明间硝基苯璜酸的回收采用：生成氰化氢气体的同时，在酸性条件下，间硝基苯磺酸根反应成间硝基苯璜酸析出，过滤，收集沉淀回收。(3) The recovery of m-nitrobenzene sulfonic acid of the present invention adopts: while generating hydrogen cyanide gas, under acidic conditions, m-nitrobenzene sulfonate reacts into m-nitrobenzene sulfonic acid and separates out, filters, collects precipitation and reclaims.
(4)本发明镍的回收：废水中CN-被分离回收以后，Ni2+在碱性条件下形成氢氧化镍沉淀，过滤使镍得到回收。(4) Recovery of nickel in the present invention: after CN in the wastewater is separated and recovered, Ni 2+ forms nickel hydroxide precipitation under alkaline conditions, and nickel is recovered by filtration.
(5)本发明出水循环使用：将出水与回收的氰化物、间硝基苯璜酸混匀即重新可用于次品镀件的化学清洗，从而达到废水中的资源得到回收利用。(5) The effluent of the present invention is recycled: the effluent is mixed with recovered cyanide and m-nitrobenzenesulfonic acid and can be used again for chemical cleaning of defective plated parts, so that the resources in the waste water can be recycled.
具体实施方式 Detailed ways
下面结合实施例对本发明作进一步的描述，但本发明的实施方式不限于此。The present invention will be further described below in conjunction with examples, but the embodiments of the present invention are not limited thereto.
实施例1Example 1
取电镀次品镀件化学清洗废水于反应器中，加入硫酸溶液，调节废水样的pH为1～2，搅拌均匀，在20～30℃下加热，使逸出的HCN气体被氢氧化钠溶液吸收，同时分离析出的间硝基苯磺酸沉淀，以便回收利用。取回收HCN和间硝基苯磺酸后的滤液中，加入氢氧化钠溶液，调节滤液的pH至10～11，并不断搅拌，使溶液中慢慢析出氢氧化镍沉淀，并至沉淀完全后，静置，过滤，回收氢氧化镍，分离沉淀后的溶液回用于上述清洗工艺。Take the chemical cleaning wastewater of electroplating defective products and plating parts in the reactor, add sulfuric acid solution, adjust the pH of the wastewater sample to 1-2, stir evenly, and heat at 20-30°C to make the escaped HCN gas be absorbed by the sodium hydroxide solution Absorption, while separating the precipitated m-nitrobenzenesulfonic acid for recycling. Take the filtrate after recovering HCN and m-nitrobenzenesulfonic acid, add sodium hydroxide solution, adjust the pH of the filtrate to 10-11, and keep stirring, so that nickel hydroxide precipitates slowly in the solution, and until the precipitation is complete , stand still, filter, recover nickel hydroxide, separate the solution after precipitation and return to the above-mentioned cleaning process.
实施例2Example 2
取电镀次品镀件化学清洗废水于反应器中，加入盐酸溶液，调节废水的pH为2～3，搅拌均匀，40～60℃下加热，使逸出的HCN气体被氢氧化钾溶液吸收，同时分离析出的间硝基苯磺酸沉淀，以便回收利用。取回收HCN和间硝基苯磺酸后的滤液中，加入氢氧化钾溶液，调节滤液的pH至9～10，并不断搅拌，使溶液中慢慢析出氢氧化镍沉淀，并至沉淀完全后，静置，过滤，回收氢氧化镍，分离沉淀后的溶液回用于上述清洗工艺。Take the chemical cleaning waste water of electroplating defective products in the reactor, add hydrochloric acid solution, adjust the pH of the waste water to 2-3, stir evenly, heat at 40-60°C, so that the escaped HCN gas is absorbed by the potassium hydroxide solution, At the same time, the precipitated m-nitrobenzenesulfonic acid is separated for recycling. Take the filtrate after recovering HCN and m-nitrobenzenesulfonic acid, add potassium hydroxide solution, adjust the pH of the filtrate to 9-10, and keep stirring, so that nickel hydroxide precipitates out slowly in the solution, and until the precipitation is complete , stand still, filter, recover nickel hydroxide, separate the solution after precipitation and return to the above-mentioned cleaning process.
实施例3Example 3
取电镀次品镀件化学清洗废水于反应器中，加入磷酸溶液，调节废水的pH为3～5，搅拌均匀，60～80℃下加热，使逸出的HCN气体被氢氧化钠溶液吸收，同时分离析出的间硝基苯磺酸沉淀，以便回收利用。取回收HCN和间硝基苯磺酸后的滤液中，加入氢氧化钠溶液，调节滤液的pH至10～14，并不断搅拌，使溶液中慢慢析出氢氧化镍沉淀，并至沉淀完全后，静置，过滤，回收氢氧化镍，分离沉淀后的溶液回用于上述清洗工艺。Take the chemical cleaning wastewater of electroplating defective parts in the reactor, add phosphoric acid solution, adjust the pH of the wastewater to 3-5, stir evenly, and heat at 60-80°C, so that the escaped HCN gas is absorbed by the sodium hydroxide solution, At the same time, the precipitated m-nitrobenzenesulfonic acid is separated for recycling. Take the filtrate after recovering HCN and m-nitrobenzenesulfonic acid, add sodium hydroxide solution, adjust the pH of the filtrate to 10-14, and keep stirring, so that nickel hydroxide precipitates slowly in the solution, and until the precipitation is complete , stand still, filter, recover nickel hydroxide, separate the solution after precipitation and return to the above-mentioned cleaning process.
实施例4Example 4
取电镀次品镀件化学清洗废水于反应器中，加入硝酸溶液，调节废水的pH为5～7，搅拌均匀，70～90℃下加热，使逸出的HCN气体被氢氧化钾溶液吸收，同时分离析出的间硝基苯磺酸沉淀，以便回收利用。取回收HCN和间硝基苯磺酸后的滤液中，加入氢氧化钾溶液，调节滤液的pH至13～14，并不断搅拌，使溶液中慢慢析出氢氧化镍沉淀，并至沉淀完全后，静置，过滤，回收氢氧化镍，分离沉淀后的溶液回用于上述清洗工艺。Take the chemical cleaning waste water of electroplating defective products in the reactor, add nitric acid solution, adjust the pH of the waste water to 5-7, stir evenly, and heat at 70-90°C, so that the escaped HCN gas is absorbed by the potassium hydroxide solution, At the same time, the precipitated m-nitrobenzenesulfonic acid is separated for recycling. Take the filtrate after recovering HCN and m-nitrobenzenesulfonic acid, add potassium hydroxide solution, adjust the pH of the filtrate to 13-14, and keep stirring, so that nickel hydroxide precipitates slowly in the solution, and until the precipitation is complete , stand still, filter, recover nickel hydroxide, separate the solution after precipitation and return to the above-mentioned cleaning process.
实施例5Example 5
取电镀次品镀件化学清洗废水于反应器中，加入硝酸溶液，调节废水的pH为5～7，搅拌均匀，90～110℃下加热，使逸出的HCN气体被氢氧化钠溶液吸收，同时分离析出的间硝基苯磺酸沉淀，以便回收利用。取回收HCN和间硝基苯磺酸后的滤液中，加入氢氧化钠溶液，调节滤液的pH至10～12，并不断搅拌，使溶液中慢慢析出氢氧化镍沉淀，并至沉淀完全后，静置，过滤，回收氢氧化镍，分离沉淀后的溶液回用于上述清洗工艺。Take the chemical cleaning waste water of electroplating defective products in the reactor, add nitric acid solution, adjust the pH of the waste water to 5-7, stir evenly, heat at 90-110°C, so that the escaped HCN gas is absorbed by the sodium hydroxide solution, At the same time, the precipitated m-nitrobenzenesulfonic acid is separated for recycling. Take the filtrate after recovering HCN and m-nitrobenzenesulfonic acid, add sodium hydroxide solution, adjust the pH of the filtrate to 10-12, and keep stirring, so that nickel hydroxide precipitates slowly in the solution, and until the precipitation is complete , stand still, filter, recover nickel hydroxide, separate the solution after precipitation and return to the above-mentioned cleaning process.
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