CN102965667A - Method for regenerating and recycling waste etching solution in stainless steel etching production line - Google Patents
Method for regenerating and recycling waste etching solution in stainless steel etching production line Download PDFInfo
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- CN102965667A CN102965667A CN2012105259920A CN201210525992A CN102965667A CN 102965667 A CN102965667 A CN 102965667A CN 2012105259920 A CN2012105259920 A CN 2012105259920A CN 201210525992 A CN201210525992 A CN 201210525992A CN 102965667 A CN102965667 A CN 102965667A
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- 238000005530 etching Methods 0.000 title claims abstract description 120
- 239000002699 waste material Substances 0.000 title claims abstract description 70
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 34
- 239000010935 stainless steel Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004064 recycling Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 230000001172 regenerating effect Effects 0.000 title abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 78
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000011069 regeneration method Methods 0.000 claims abstract description 28
- 230000008929 regeneration Effects 0.000 claims abstract description 27
- 239000007800 oxidant agent Substances 0.000 claims abstract description 17
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 8
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 8
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 20
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 claims description 11
- 239000012286 potassium permanganate Substances 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000002378 acidificating effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000033116 oxidation-reduction process Effects 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
本发明提供一种不锈钢蚀刻生产线蚀刻废液再生和循环利用的方法，向蚀刻废液或循环流动的蚀刻废液中先加入废液重量1-15%的氧化剂，后加入废液重量5-25%的工业盐酸，保持蚀刻废液搅拌或循环流动一段时间即完成废液再生。尤其是通过2-6次的方式加入氧化剂。本发明是不锈钢蚀刻废液再生利用的简易方法。使不锈钢蚀刻废液的蚀刻效率恢复至新液水平，达到再生和循环利用的目的。本方法无须添加三氯化铁且不用换缸，再生速度快、操作简单、成本低，可实现不锈钢蚀刻液的长期循环使用。
The invention provides a method for regenerating and recycling etching waste liquid in a stainless steel etching production line. Firstly add an oxidant with 1-15% of the waste liquid weight to the etching waste liquid or circulating etching waste liquid, and then add 5-25% of the waste liquid weight. % industrial hydrochloric acid, keep the etching waste liquid stirring or circulating for a period of time to complete the waste liquid regeneration. Especially by adding the oxidizing agent 2-6 times. The invention is a simple method for recycling stainless steel etching waste liquid. The etching efficiency of stainless steel etching waste liquid is restored to the new liquid level, and the purpose of regeneration and recycling is achieved. The method does not need to add ferric chloride and does not need to change cylinders, has fast regeneration speed, simple operation and low cost, and can realize long-term recycling of stainless steel etching solution.
Description
技术领域technical field
本发明涉及不锈钢蚀刻废液再生的方法，特别是不锈钢蚀刻板生产过程中酸性三氯化铁蚀刻废液的再生的简易方法。The invention relates to a method for regenerating stainless steel etching waste liquid, in particular to a simple method for regenerating acidic ferric chloride etching waste liquid in the production process of stainless steel etching plates.
背景技术Background technique
不锈钢蚀刻技术在不锈钢印花、雕刻中有着广泛应用。酸性三氯化铁蚀刻液因其价廉、腐蚀效率稳定且不产生有害及易燃气体，长期以来一直是不锈钢蚀刻装饰板生产过程中的首选。在酸性三氯化铁的溶液中，三价铁与不锈钢中的铁反应，生成二价铁。随着反应的进行，蚀刻液中的三价铁浓度不断降低，二价铁浓度不断升高，氧化还原电位不断的衰减，腐蚀效率的降低。当电位衰减到一定程度，蚀刻液腐蚀效果不能满足印花和雕刻等要求，此时就必须停机将蚀刻机液缸内的所有废液抽出，更换新的蚀刻液方可继续进行生产。这种间歇式生产方式不但生产效率低下，而且工厂还需要安排大量场地堆放蚀刻液和蚀刻废液，安全隐患大。不锈钢装饰材料企业对蚀刻废液一般是通过私自排放或者由生产厂商无偿回收等方式处理，造成环境污染和资源浪费。而现有对于蚀刻液的再生方法（参见专利CN02116014.7、CN200310120087.8、CN200810065306.X）工艺复杂且成本高，难以在工业生产中实现在线更新、再生和循环利用。Stainless steel etching technology is widely used in stainless steel printing and engraving. Acidic ferric chloride etching solution has long been the first choice in the production process of stainless steel etching decorative panels because of its low price, stable corrosion efficiency and no harmful and flammable gases. In the acidic ferric chloride solution, ferric iron reacts with iron in stainless steel to form ferrous iron. As the reaction proceeds, the concentration of ferric iron in the etching solution decreases continuously, the concentration of ferrous iron increases continuously, the oxidation-reduction potential decreases continuously, and the corrosion efficiency decreases. When the potential decays to a certain extent, the corrosion effect of the etching solution cannot meet the requirements of printing and engraving. At this time, it is necessary to stop the machine to pump out all the waste liquid in the etching machine liquid tank, and replace it with a new etching solution to continue production. This intermittent production method not only has low production efficiency, but the factory also needs to arrange a large number of places to stack etching solution and etching waste solution, which poses a great safety hazard. Stainless steel decorative materials companies generally dispose of etching waste liquid by private discharge or free recycling by manufacturers, resulting in environmental pollution and waste of resources. However, the existing methods for regeneration of etching solution (see patents CN02116014.7, CN200310120087.8, CN200810065306.X) are complex and costly, and it is difficult to realize online renewal, regeneration and recycling in industrial production.
本发明基于蚀刻液中二价铁的氧化反应，采用双氧水、高锰酸钾、和氯酸钠为氧化剂，实现了蚀刻废液的迅速再生。此法简单易行且成本低，特别适合在不锈钢蚀刻生产线上应用。Based on the oxidation reaction of divalent iron in the etching solution, the invention uses hydrogen peroxide, potassium permanganate and sodium chlorate as oxidants to realize rapid regeneration of the etching waste solution. This method is simple, easy to implement and low in cost, and is especially suitable for application in stainless steel etching production lines.
发明内容Contents of the invention
本发明的目的在于，提供一种能在不锈钢蚀刻生产线上直接使用，实现酸性三氯化铁蚀刻废液再生和循环利用的方法。The purpose of the present invention is to provide a method that can be directly used on a stainless steel etching production line to realize the regeneration and recycling of acidic ferric chloride etching waste liquid.
鉴于上述发明目的，本发明采用了如下的技术方案：不锈钢蚀刻生产线蚀刻废液再生和循环利用的方法，向蚀刻废液或循环流动的蚀刻废液中先加入废液重量1-15%的氧化剂，后加入废液重量5-25%的工业盐酸，保持蚀刻废液搅拌或循环流动一段时间即完成废液整个再生过程。尤其是通过少量多次的方式加入氧化剂，以2-6次的方式加入全部氧化剂，每次的加量可大致相同。In view of the above-mentioned purpose of the invention, the present invention adopts the following technical scheme: the method for regeneration and recycling of etching waste liquid in stainless steel etching production line, in the etching waste liquid or circulating etching waste liquid, first add the oxidizing agent of 1-15% of waste liquid weight , and finally add industrial hydrochloric acid with 5-25% of the weight of the waste liquid, and keep the etching waste liquid stirring or circulating for a period of time to complete the entire regeneration process of the waste liquid. In particular, the oxidizing agent is added in a small amount and multiple times, and all the oxidizing agents are added in 2-6 times, and the amount added each time can be roughly the same.
在该技术方案中，不锈钢蚀刻废液的再生温度是室温-50℃，尤其是恒定为35-50℃；最好是40-50℃。不锈钢蚀刻废液主要组成为酸性三氯化铁溶液，波美度为40-44；工业盐酸质量百分比浓度为30-37%。In this technical scheme, the regeneration temperature of the stainless steel etching waste liquid is room temperature-50°C, especially constant at 35-50°C; preferably 40-50°C. The stainless steel etching waste liquid is mainly composed of acidic ferric chloride solution with a Baume degree of 40-44; the mass percentage concentration of industrial hydrochloric acid is 30-37%.
氧化剂为双氧水、高锰酸钾、氯酸钠中的一种；当使用双氧水为氧化剂时，所使用的双氧水为工业级或化学纯等均可，质量百分比浓度为30%，用量为蚀刻废液重量的5-15%，工业盐酸用量为蚀刻废液重量的15-25%；当使用高锰酸钾为氧化剂时，所使用的高锰酸钾为工业级或化学纯等均可，用量为蚀刻废液重量的1-5%，工业盐酸用量为蚀刻废液重量的5-25%；当使用氯酸钠为氧化剂时，所使用的氯酸钠为工业级或化学纯等均可，用量为蚀刻废液重量的1-5%；工业盐酸用量尤其是为蚀刻废液重量的5-20%；待氧化剂和工业盐酸都加入后或加入时，蚀刻废液进行搅拌或保持循环流动的时间为5-15分钟。本发明氧化剂和工业盐酸的添加量主要根据蚀刻液的氧化还原电位和蚀刻后样板的质量损失情况决定。蚀刻消耗比较多时，添加量就要多一些。The oxidant is one of hydrogen peroxide, potassium permanganate, and sodium chlorate; when hydrogen peroxide is used as the oxidant, the hydrogen peroxide used can be industrial grade or chemically pure, with a concentration of 30% by mass, and the dosage is 5-15% of the weight, the amount of industrial hydrochloric acid is 15-25% of the weight of the etching waste liquid; 1-5% of the weight of the etching waste liquid, the amount of industrial hydrochloric acid is 5-25% of the weight of the etching waste liquid; when sodium chlorate is used as the oxidant, the sodium chlorate used can be industrial grade or chemical pure It is 1-5% of the weight of the etching waste liquid; the amount of industrial hydrochloric acid is especially 5-20% of the weight of the etching waste liquid; after the oxidant and industrial hydrochloric acid are added or added, the time for the etching waste liquid to stir or keep circulating for 5-15 minutes. The addition amount of the oxidizing agent of the present invention and industrial hydrochloric acid is mainly determined according to the oxidation-reduction potential of the etching solution and the mass loss of the sample after etching. When the etching consumption is relatively large, the amount of addition will be more.
本发明的有益效果是：与现有技术相比，本发明不锈钢蚀刻废液再生方法的优点在于：The beneficial effects of the present invention are: compared with the prior art, the advantages of the stainless steel etching waste liquid regeneration method of the present invention are:
1.工艺简单，可在线添加，可实现连续生产。只需要向不锈钢蚀刻废液中加入所需原料，就能实现再生和循环使用，避免了频繁换缸，缩短了蚀刻板生产周期，提高了生产效率。1. The process is simple, can be added online, and can realize continuous production. Regeneration and recycling can be achieved only by adding the required raw materials to the stainless steel etching waste liquid, avoiding frequent cylinder changes, shortening the production cycle of etching plates, and improving production efficiency.
2.成本低廉，性价比高。本发明技术再生每吨蚀刻废液的成本不足200元，性价比高。2. Low cost and high cost performance. The cost of regenerating each ton of etching waste liquid by the technology of the present invention is less than 200 yuan, and the cost performance is high.
3.再生蚀刻液的蚀刻效果与原液相当，使用周期得以延长。在相同条件下，分别利用本发明实施例1-3所获得的再生蚀刻液以及原液对同批次900mm×900mm的304不锈钢板进行蚀刻，蚀刻时间3min，蚀刻温度40℃，利用重量法和氧化还原电位分析法（ORP计）分析不同蚀刻液在多次蚀刻后的蚀刻效果。由图1、图2可以发现，再生蚀刻液的氧化还原电位超过原液，多次蚀刻后样板的质量损失仍高于原液，以上结果充分说明利用本发明提供的方法获得的再生蚀刻液的蚀刻效果达到原液水平，使用周期比原液更长。本发明是不锈钢蚀刻废液再生利用的简易方法。使不锈钢蚀刻废液的蚀刻效率恢复至新液水平，达到再生和循环利用的目的。本方法无须添加三氯化铁且不用换缸，再生速度快、操作简单、成本低，可实现不锈钢蚀刻液的长期循环使用。3. The etching effect of the regenerated etching solution is equivalent to that of the original solution, and the service life can be extended. Under the same conditions, the 304 stainless steel plates of the same batch of 900 mm × 900 mm were etched using the regenerated etching solution and the original solution obtained in Examples 1-3 of the present invention, the etching time was 3 minutes, the etching temperature was 40 ° C, and the gravimetric method and oxidation method were used. The reduction potential analysis method (ORP meter) analyzes the etching effect of different etching solutions after multiple etchings. From Fig. 1 and Fig. 2, it can be found that the oxidation-reduction potential of the regenerated etching solution exceeds that of the original solution, and the mass loss of the sample after multiple etchings is still higher than that of the original solution. The above results fully illustrate the etching effect of the regenerated etching solution obtained by the method provided by the present invention Reach the original liquid level, the use cycle is longer than the original liquid. The invention is a simple method for recycling stainless steel etching waste liquid. The etching efficiency of stainless steel etching waste liquid is restored to the new liquid level, and the purpose of regeneration and recycling is achieved. The method does not need to add ferric chloride and does not need to change cylinders, has fast regeneration speed, simple operation and low cost, and can realize long-term recycling of stainless steel etching solution.
附图说明Description of drawings
图1为质量损失随蚀刻次数的变化图。Figure 1 is a graph showing the variation of mass loss with the number of etching times.
图2为氧化还原电势随蚀刻次数的变化图。Fig. 2 is a diagram showing the variation of redox potential with the number of etching times.
具体实施方式Detailed ways
下面通过具体的实施例的方式对本发明关于不锈钢蚀刻液再生方法进行说明，但本发明不局限于这些实施例。The method for regenerating the stainless steel etching solution of the present invention will be described below by means of specific examples, but the present invention is not limited to these examples.
实施例1Example 1
在40℃恒温下，通过少量多次的方式向循环流动的1000kg蚀刻废液中先加入100kg质量百分比浓度为30%的双氧水，然后再加入180kg质量百分比浓度为30-37%的工业盐酸，保持蚀刻液循环流动10分钟即可完成蚀刻液再生。At a constant temperature of 40°C, add 100kg of hydrogen peroxide with a mass percentage concentration of 30% to the circulating 1000kg etching waste liquid in a small number of times, and then add 180kg of industrial hydrochloric acid with a mass percentage concentration of 30-37%, keeping The etchant can be regenerated by circulating the etchant for 10 minutes.
实施例2Example 2
在35℃恒温下，通过少量多次的方式向循环流动的1000kg蚀刻废液中先加入35kg高锰酸钾至全部溶解，然后再加入170kg质量百分比浓度为30-37%的工业盐酸，保持蚀刻液循环流动10分钟即可完成蚀刻液再生。化学纯盐酸当然更好。At a constant temperature of 35°C, add 35kg of potassium permanganate to the 1000kg of circulating etching waste liquid in a small amount and several times until it is completely dissolved, and then add 170kg of industrial hydrochloric acid with a concentration of 30-37% by mass to maintain etching The etching solution can be regenerated after the liquid circulates for 10 minutes. Chemically pure hydrochloric acid is of course better.
实施例3Example 3
在40℃恒温下，通过少量多次的方式向1000kg蚀刻废液中先加入20kg氯酸钠至全部溶解，然后再加入120kg质量百分比浓度为30-37%的工业盐酸，保持蚀刻液搅拌10分钟即可完成蚀刻液再生。At a constant temperature of 40°C, add 20kg of sodium chlorate to 1000kg of etching waste solution in a small amount for several times until completely dissolved, then add 120kg of industrial hydrochloric acid with a concentration of 30-37% by mass, and keep stirring the etching solution for 10 minutes The regeneration of the etchant can be completed.
实施例4Example 4
在45℃恒温下，通过少量多次的方式向循环流动的1000kg蚀刻废液中先加入150kg质量百分比浓度为30%的双氧水，然后再加入230kg质量百分比浓度为30-37%的工业盐酸，保持蚀刻液循环流动10分钟即可完成蚀刻液再生。At a constant temperature of 45°C, add 150kg of hydrogen peroxide with a concentration of 30% by mass to the 1000kg of circulating etching waste in small amounts and several times, and then add 230kg of industrial hydrochloric acid with a concentration of 30-37% by mass to keep The etchant can be regenerated by circulating the etchant for 10 minutes.
实施例5Example 5
在50℃恒温下，通过少量多次的方式向循环流动的1000kg蚀刻废液中先加入15kg高锰酸钾至全部溶解，然后再加入90kg质量百分比浓度为30-37%的工业盐酸，保持蚀刻液循环流动5分钟即可完成蚀刻液再生。At a constant temperature of 50°C, add 15kg of potassium permanganate to the 1000kg of circulating etching waste liquid in a small amount and several times until it is completely dissolved, and then add 90kg of industrial hydrochloric acid with a concentration of 30-37% by mass to keep the etching process The etching solution can be regenerated after 5 minutes of liquid circulation.
实施例6Example 6
在45℃恒温下，通过少量多次的方式向循环流动的1000kg蚀刻废液中先加入40kg氯酸钠至全部溶解，然后再加入180kg质量百分比浓度为30-37%的工业盐酸，保持蚀刻液循环流动15分钟即可完成蚀刻液再生。At a constant temperature of 45°C, add 40kg of sodium chlorate to the 1000kg of circulating etching waste liquid in a small number of times until completely dissolved, and then add 180kg of industrial hydrochloric acid with a concentration of 30-37% by mass to keep the etching liquid Regeneration of etching solution can be completed after 15 minutes of circulating flow.
实施例7Example 7
在50℃恒温下，通过少量多次的方式向循环流动的1000kg蚀刻废液中先加入75kg质量百分比浓度为30%的双氧水，然后再加入230kg质量百分比浓度为30-37%的工业盐酸，保持蚀刻液循环流动5分钟即可完成蚀刻液再生。At a constant temperature of 50°C, add 75kg of hydrogen peroxide with a mass percentage concentration of 30% to the circulating 1000kg etching waste liquid in a small number of times, and then add 230kg of industrial hydrochloric acid with a mass percentage concentration of 30-37%, keeping The etchant can be regenerated by circulating the etchant for 5 minutes.
实施例8Example 8
在45℃恒温下，通过少量多次的方式向循环流动的1000kg蚀刻废液中先加入45kg高锰酸钾至全部溶解，然后再加入240kg质量百分比浓度为30-37%的工业盐酸，保持蚀刻液循环流动15分钟即可完成蚀刻液再生。At a constant temperature of 45°C, add 45kg of potassium permanganate to the 1000kg of circulating etching waste liquid in a small number of times until completely dissolved, and then add 240kg of industrial hydrochloric acid with a concentration of 30-37% by mass to maintain etching The etching solution can be regenerated after the liquid circulates for 15 minutes.
实施例9Example 9
在50℃恒温下，通过少量多次的方式向循环流动的1000kg蚀刻废液中先加入10kg氯酸钠至全部溶解，然后再加入70kg质量百分比浓度为30-37%的工业盐酸，保持蚀刻液循环流动5分钟即可完成蚀刻液再生。At a constant temperature of 50°C, add 10kg of sodium chlorate to the 1000kg of circulating etching waste liquid in a small number of times until completely dissolved, and then add 70kg of industrial hydrochloric acid with a concentration of 30-37% by mass to keep the etching liquid Regeneration of etching solution can be completed after 5 minutes of circulating flow.
实施例10Example 10
在40℃条件下，对1000kg蚀刻废液中先加入15kg氯酸钠，搅拌至全部溶解，然后再加入65kg质量百分比浓度为30-37%的工业盐酸，保持搅拌5分钟即可完成蚀刻液再生，静置过滤后即可回用。蚀刻消耗比较多时，添加50kg氯酸钠和250kg质量百分比浓度为30-37%的工业盐酸。At 40°C, add 15kg of sodium chlorate to 1000kg of etching waste liquid, stir until completely dissolved, then add 65kg of industrial hydrochloric acid with a concentration of 30-37% by mass, and keep stirring for 5 minutes to complete the regeneration of etching liquid , it can be reused after standing and filtering. When the etching consumption is relatively large, add 50kg of sodium chlorate and 250kg of industrial hydrochloric acid with a concentration of 30-37% by mass.
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| CN103710706A (en) * | 2013-12-24 | 2014-04-09 | 沈阳师范大学 | Purification and regeneration method of iron trichloride etching waste liquid |
| CN104087941A (en) * | 2014-07-17 | 2014-10-08 | 深圳市卓力达电子有限公司 | Etching method and equipment of etching stainless steel by ferric chloride |
| CN105018732A (en) * | 2015-07-01 | 2015-11-04 | 夏栋 | Novel method for comprehensive recovery of etching waste liquid and waste residues |
| CN110528006A (en) * | 2019-09-11 | 2019-12-03 | 上海八菱环保科技有限公司 | Automatic adding device, etching production line, adding method, control system, control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103710706A (en) * | 2013-12-24 | 2014-04-09 | 沈阳师范大学 | Purification and regeneration method of iron trichloride etching waste liquid |
| CN103710706B (en) * | 2013-12-24 | 2015-12-02 | 沈阳师范大学 | The electrolysis method method of iron trichloride etching waste liquid |
| CN104087941A (en) * | 2014-07-17 | 2014-10-08 | 深圳市卓力达电子有限公司 | Etching method and equipment of etching stainless steel by ferric chloride |
| CN105018732A (en) * | 2015-07-01 | 2015-11-04 | 夏栋 | Novel method for comprehensive recovery of etching waste liquid and waste residues |
| CN110528006A (en) * | 2019-09-11 | 2019-12-03 | 上海八菱环保科技有限公司 | Automatic adding device, etching production line, adding method, control system, control method |
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