CN111621789A - Method for recycling ferric trichloride etching waste liquid with low investment, fast effect, high benefit and zero emission - Google Patents
Method for recycling ferric trichloride etching waste liquid with low investment, fast effect, high benefit and zero emission Download PDFInfo
- Publication number
- CN111621789A CN111621789A CN202010649544.6A CN202010649544A CN111621789A CN 111621789 A CN111621789 A CN 111621789A CN 202010649544 A CN202010649544 A CN 202010649544A CN 111621789 A CN111621789 A CN 111621789A
- Authority
- CN
- China
- Prior art keywords
- reaction kettle
- waste liquid
- filtering
- ferric trichloride
- etching waste
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/46—Regeneration of etching compositions
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a method for recycling ferric trichloride etching waste liquid, which has the advantages of low investment, quick effect, high benefit and zero emission, and sequentially comprises the following steps: pumping the ferric trichloride etching waste liquid into a reaction kettle, adding iron powder, stirring for reaction, and filtering; pumping the filtrate into a second reaction kettle, adding 60% of industrial sodium sulfide according to 2.2-4 times of the detected nickel content, and filtering; putting the nickel slag into a third reaction kettle, adding 2-5 times of water for washing, and filtering; pumping the filtrate into a fourth reaction kettle, stirring, adding alkali liquor, and filtering; re-dissolving the filter residue in acid solution in a fifth reaction kettle, introducing an oxidant, and filtering; pumping the filtrate into a sixth reaction kettle, stirring, adding alkali liquor, and filtering. The invention is based on a more systematic and comprehensive chemical separation method, can completely separate various components (mainly containing iron, nickel, chromium and copper) in the ferric trichloride waste liquid, and can achieve the requirement of respective sale by controlling the metal content in the product, thereby finally achieving the purpose of zero emission.
Description
Technical Field
The invention relates to the technical field of comprehensive recycling and environmental protection of ferric trichloride etching waste liquid, in particular to a method for recycling ferric trichloride etching waste liquid, which has the advantages of low investment, quick effect, high benefit and zero emission.
Background
A factory for etching stainless steel or copper by using ferric trichloride as an etching agent continuously generates black brown ferric trichloride etching waste liquid after etching for a period of time, and a large amount of heavy metals (copper, nickel, chromium and the like) can be accumulated in the etching waste liquid to influence normal etching work, at this time, a new etching liquid needs to be replaced, and the replaced waste etching liquid can be discharged after being treated to reach a discharge standard. The existing method for treating the ferric trichloride etching waste liquid generally comprises an electrolytic method and an extraction method, wherein the electrolytic method is used for separating various metal elements by controlling electrolytic current according to different electrolytic potentials of different metals, and the method has the obvious defects of high energy consumption, potential safety hazard caused by the fact that a by-product chlorine is extremely toxic, and products cannot be completely separated; the extraction method achieves the separation purpose according to different distribution coefficients of different metal elements in an extractant, and has the defects that the extractant is easy to be poisoned, the cost is high, and the purpose of completely separating various metal elements is not easy to achieve;
in addition, a chemical separation method for separately separating certain impurities is provided, but the chemical separation method is local and has no systematicness, the problem of waste discharge of an etching plant cannot be completely solved, the separated products cannot meet the sales standard, the dangerous waste is inevitably generated, and the high-price dangerous waste disposal cost is still paid; even some manufacturers directly neutralize the waste liquid with alkali to precipitate all metal elements as dangerous waste, which wastes resources and pays a large amount of dangerous waste disposal fees. In summary, the existing method has high investment and cost and always generates hazardous wastes, and the high-price hazardous waste disposal fee is paid.
In order to solve the problems, the scheme is developed accordingly.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for recycling ferric trichloride etching waste liquid, which has the advantages of low investment, quick effect, high benefit and zero emission, solves the problem of worries after waste discharge of various etching factories, realizes zero emission of waste, does not need to pay high hazardous waste disposal cost, and creates great economic benefit and social benefit for companies.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for recycling ferric trichloride etching waste liquid with less investment, quick effect, high benefit and zero emission sequentially comprises the following steps:
s1, pumping the ferric trichloride etching waste liquid (wherein sludge generated after acid washing water after washing a plate is neutralized by alkali is dissolved by acid and then is treated the same as the waste liquid) into a reaction kettle, adding iron powder for stirring reaction, controlling the end point PH to be 1-4, filtering the solution to obtain copper-containing solution with the copper content of less than 200mg/L, and directly selling the copper slag;
s2, pumping the filtrate obtained in the step 1 into a second reaction kettle, adding 60% of industrial sodium sulfide (prepared into a 20-50% solution) in an amount which is 2.2-4 times of the detected nickel content, controlling the nickel content in the solution to be less than 100mg/L at the end point, and filtering;
s3, putting the nickel slag obtained in the step 2 into a third reaction kettle, adding 2-5 times of water to control the PH value to be 1-4, washing, and filtering, wherein the nickel content of the filtered nickel slag is more than 10% and the nickel slag can be directly sold;
s4, pumping the filtrate obtained in the step 3 into a fourth reaction kettle, stirring, adding alkali liquor to adjust the pH to 3-6, controlling the chromium content in the solution to be less than 100mg/L at the end point, filtering, adding an oxidant into the filtrate, concentrating and crystallizing to prepare an iron trichloride product for sale, wherein the iron content of the filtrate is more than 10 percent and the filtrate can be directly sold as a water purifying agent;
s5, re-dissolving the filter residue obtained in the step 4 in acid in a fifth reaction kettle, introducing an oxidant, controlling the content of ferrous ions at the end point of the reaction to be 2-10g/L, and putting the filtered iron residue into the first reaction kettle for treatment and utilization;
s6, pumping the filtrate obtained in the step 5 into a sixth reaction kettle, stirring, adding alkali liquor, adjusting the pH to 5-7, filtering, directly selling the filter residues serving as the raw material of the chrome brick, and using the filtrate as washing water of the third reaction kettle.
Preferably, the filtration in the method for recycling the ferric trichloride etching waste liquid adopts plate-and-frame filtration.
Preferably, the pH value in the step 1 is preferably pH2-3, the pH value in the step 3 is preferably pH3-4, and the pH value in the step 4 is preferably pH 5-6.
Preferably, the oxidant introduced in step 5 is any one of air, ozone, sodium chlorate, sodium hypochlorite and hydrogen peroxide.
Preferably, the feeding speed in the step 2 and the feeding speed in the step 4 are both controlled to be 10-30L/min.
Preferably, the feeding mode in step 2 and step 4 is spray feeding.
(III) advantageous effects
After adopting the technical scheme, compared with the prior art, the invention has the following advantages: the invention relates to a method for recycling ferric trichloride etching waste liquid, which has the advantages of low investment, quick effect, high benefit and zero emission, and is based on a more systematic and comprehensive chemical separation method, wherein various components (mainly containing iron, nickel, chromium and copper) in the ferric trichloride etching waste liquid (including sludge obtained by neutralizing acid liquor obtained after plate washing with alkali) are completely separated, and the metal content in the product is controlled to meet the requirement of respective sale, so that the aim of zero emission is finally achieved. Meanwhile, aiming at the efficient treatment of solid waste and liquid waste after etching by etching manufacturers, the zero emission of three wastes is realized, a large amount of hazardous waste disposal cost is saved, and worries of all etching manufacturers are perfectly solved.
Drawings
FIG. 1 is a flow chart of the method for recycling ferric trichloride etching waste liquid according to the present invention;
FIG. 2 is a schematic view of a spray feeder of the present invention;
Detailed Description
The invention is explained in more detail below with reference to the figures and examples.
A method for recycling ferric trichloride etching waste liquid with less investment, quick effect, high benefit and zero emission sequentially comprises the following steps:
step 1, pumping ferric trichloride etching waste liquid (wherein sludge generated after acid washing water after plate washing is neutralized by alkali is treated by acid and then treated with the same as the waste liquid) into a reaction kettle, adding iron powder, stirring for reaction, controlling the end point PH1-4, preferably PH2-3, controlling the copper content of the solution to be less than 200mg/L, filtering by a plate-and-frame filter, and directly selling copper slag;
step 2, pumping the filtrate into a second reaction kettle, adding 60 percent of industrial sodium sulfide (prepared into a 20-50 percent solution) according to 2.2-4 times of the tested content of nickel, controlling the feeding speed at 10-30L/min, and controlling the nickel content in the solution to be less than 100mg/L at the end point;
step 3, putting the filtered nickel slag into a third reaction kettle, adding 2-5 times of water to control the PH1-4 to wash, preferably selecting the PH3-4, wherein more than 10% of the filtered nickel can be directly sold;
step 4, pumping the filtrate into a fourth reaction kettle, stirring, adding alkali liquor to adjust the pH of 3-6, preferably 5-6, controlling the feeding speed to be 10-30L/min, controlling the chromium content in the solution to be less than 100mg/L at the end point, directly selling the filtrate as a water purifying agent, and adding an oxidant to concentrate and crystallize according to the situation to prepare an iron trichloride product for sale;
step 5, after the slag is redissolved in a fifth reaction kettle, introducing air or ozone or other oxidants such as sodium chlorate, sodium hypochlorite, hydrogen peroxide and the like, controlling the content of ferrous ions at the end point of the reaction to be 2-10g/L, and putting the filtered iron slag into the first reaction kettle for treatment;
and 6, pumping the filtrate into a sixth reaction kettle, stirring, adding alkali liquor to adjust the pH of the mixture to 5-7, directly selling the filter residues serving as the raw material of the chrome brick, and using the filtrate as washing water of the third reaction kettle.
The present invention will be described in more detail below with reference to examples set forth herein. These examples are provided only for illustrating the present invention and should not be construed as limiting the scope of the present invention.
Example 1:
will be 11m3Pumping the ferric trichloride etching waste liquid into a first reaction kettle, starting stirring, slowly adding 800kg of 95% reduced iron powder, reacting for 2 hours, measuring the pH value to be 1.5, wherein the solution contains 185mg/L copper, and filtering to obtain copper slag containing 18.3% copper.
Filtrate 10m after copper removal3Pumping into a second reaction kettle, sampling to detect that the nickel content is 5.1g/L, adding 125kg of sodium sulfide (30% solution) at the speed of 10L per minute while stirring, continuously stirring for 2 hours, detecting that the nickel content is 55mg/L, filtering by using a plate frame, detecting that the nickel content is 9.1% in filter slag, washing the slag in a third reaction kettle by using 2.5 times of water, controlling the PH3-4, and filtering to obtain 13.5% of nickel.
9m of filtrate after nickel removal3Pumping into a fourth reaction kettle, stirring, adding 350L of liquid caustic soda (30%) at a speed of 10L/min, stirring for 2 hours, and then obtaining a solution with a pH value of 5.4, wherein the chromium content in the solution is 67mg/L and the iron content is 128 g/L; the plate-frame filtration slag contains 6.1 percent of chromium and 11.3 percent of iron.
Adding 2.5 tons of water and industrial water into a fifth reaction kettle100kg of hydrochloric acid is stirred and added into 2 tons of chromium slag (containing 12.1 percent of iron and 5.8 percent of chromium) precipitated from the fourth reaction kettle, 80kg of 98 percent industrial sodium chlorate solid is slowly added, the PH is maintained at 2-4 in the process, the temperature is lower than 60 ℃, and after the addition is finished, the stirring is carried out for 1 hour to detect that the solution contains 5.2g/L of ferrous iron and 38.1g/L of chromium; filtering with plate frame to obtain filtrate of 2.5m3Pumping into a sixth reaction kettle, stirring, adding liquid alkali to adjust the pH value to 5.8, stirring for 0.5 hour, and filtering, wherein filter residues contain 30.2% of chromium and 3.5% of iron.
Example 2:
will be 11m3Pumping the ferric trichloride etching waste liquid into a first reaction kettle, starting stirring, slowly adding 1000kg of 95% reduced iron powder, reacting for 2 hours, measuring the pH value to be 2.2, wherein the solution contains 135mg/L of copper, and filtering to obtain copper-containing copper slag of 15.2%.
Filtrate 10m after copper removal3Pumping into a second reaction kettle, sampling to detect that the nickel content is 9.9g/L, adding 250kg of sodium sulfide (30% solution) at the speed of 10L per minute while stirring, continuously stirring for 2 hours, detecting that the nickel content is 78mg/L, filtering by using a plate frame, detecting that the nickel content in filter slag is 8.8%, washing the slag in a third reaction kettle by using 2.5 times of water, controlling the PH3-4, and filtering to obtain 12.7% of nickel.
9m of filtrate after nickel removal3Pumping into a fourth reaction kettle, stirring, adding 300L of liquid caustic soda (30%) at a speed of 10L/min, stirring for 2 hours, and then obtaining a solution with a pH value of 5.1, wherein the chromium content in the solution is 88mg/L and the iron content is 130 g/L; the plate-frame filtration slag contains 6.8 percent of chromium and 10.1 percent of iron.
Adding 2.5 tons of water and 100kg of industrial hydrochloric acid into a fifth reaction kettle, stirring, adding 2 tons of chromium slag (containing 10.5 percent of iron and 6.0 percent of chromium) precipitated from a fourth reaction kettle, slowly adding 71kg of 98 percent industrial sodium chlorate solid, keeping the pH value of 2-4 in the process, keeping the temperature below 60 ℃, stirring for 1 hour after the addition is finished, and detecting that the solution contains 2.05g/L of ferrous iron and 40.5g/L of chromium; filtering with plate frame to obtain filtrate of 2.5m3Pumping into a sixth reaction kettle, stirring, adding liquid alkali to adjust the pH value to 5.5, stirring for 0.5 hour, filtering, wherein filter residues contain 35.2 percent of chromium and 1.5 percent of iron.
Example 3:
will be 11m3Pumping the ferric trichloride etching waste liquid into a first reaction kettle, starting stirring, slowly adding 1200kg of reduced iron powder, reacting for 2 hours, measuring the pH value to be 3.0, measuring the copper content of the solution to be 95mg/L, filteringThe copper content of the copper slag is 13.7 percent.
Filtrate 10m after copper removal3Pumping into a second reaction kettle, sampling to detect that the nickel content is 19.7g/L, adding 500kg of sodium sulfide (30% solution) at the speed of 10L per minute while stirring, continuously stirring for 2 hours, detecting that the nickel content is 69mg/L, filtering by using a plate frame, detecting that the nickel content in filter slag is 8.5%, washing the slag in a third reaction kettle by using 2.5 times of water, controlling the PH3-4, and filtering to obtain 12.5% of nickel.
9m of filtrate after nickel removal3Pumping into a fourth reaction kettle, stirring, adding 400L of liquid caustic soda (30%) at a speed of 10L/min, stirring for 2 hours, and then obtaining a solution with a pH value of 5.6, wherein the chromium content in the solution is 22mg/L and the iron content is 121 g/L; the plate-frame filtration slag contains 5.5 percent of chromium and 12.8 percent of iron.
Adding 2.5 tons of water and 100kg of industrial hydrochloric acid into a fifth reaction kettle, stirring, adding 2.2 tons of chromium slag (containing 10.7 percent of iron and 6.5 percent of chromium) precipitated from a fourth reaction kettle, slowly adding 70kg of 98 percent industrial sodium chlorate solid, keeping the pH value of 2-4 in the process, keeping the temperature below 60 ℃, stirring for 1 hour after the addition is finished, and detecting that the solution contains 9.8g/L of ferrous iron and 46.8g/L of chromium; filtering with plate frame to obtain filtrate of 2.5m3Pumping into a sixth reaction kettle, stirring, adding liquid alkali to adjust the pH value to 5.6, stirring for 0.5 hour, filtering, and filtering to obtain filter residue containing 24.3% of chromium and 4.9% of iron.
Further, the second and fourth reactor feeders of the present scheme can change the traditional direct-in optimization into spray type, see fig. 2.
The metal content of the product from the spray and non-spray feeds is as follows:
it is obvious from the above table that the spray-type feeding has higher recovery rate for the heavy metals of nickel and chromium accumulated in the etching solution, and the metal impurities can be better separated.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and the scope of protection thereof must be determined by the scope of claims.
Claims (6)
1. A method for recycling ferric trichloride etching waste liquid with less investment, quick effect, high benefit and zero emission is characterized in that: the method sequentially comprises the following steps:
s1, pumping the ferric trichloride etching waste liquid into a reaction kettle, adding iron powder, stirring for reaction, controlling the end point PH to be 1-4, and filtering the solution, wherein the copper content of the solution is less than 200 mg/L;
s2, pumping the filtrate obtained in the step 1 into a second reaction kettle, adding 60% of industrial sodium sulfide (prepared into a 20-50% solution) in an amount which is 2.2-4 times of the detected nickel content, controlling the nickel content in the solution to be less than 100mg/L at the end point, and filtering;
s3, putting the nickel slag obtained in the step 2 into a third reaction kettle, adding 2-5 times of water to control the PH value to be 1-4, washing, and filtering;
s4, pumping the filtrate obtained in the step 3 into a fourth reaction kettle, stirring, adding alkali liquor to adjust the pH to 3-6, controlling the chromium content in the solution to be less than 100mg/L at the end point, and filtering;
s5, redissolving the filter residue obtained in the step 4 in acid liquor in a fifth reaction kettle, introducing an oxidant, controlling the content of ferrous ions at the end point of the reaction to be 2-10g/L, and putting the filtered iron residue into the first reaction kettle for treatment and utilization;
s6, pumping the filtrate obtained in the step 5 into a sixth reaction kettle, stirring, adding alkali liquor to adjust the pH to be 5-7, and filtering to obtain filtrate serving as washing water of the third reaction kettle.
2. The method for recycling the ferric trichloride etching waste liquid, which has the advantages of low investment, quick effect, high benefit and zero emission, according to claim 1, is characterized in that: the filtration in the method step of recycling the ferric trichloride etching waste liquid adopts plate-and-frame filtration.
3. The method for recycling the ferric trichloride etching waste liquid, which has the advantages of low investment, quick effect, high benefit and zero emission, according to claim 1, is characterized in that: the PH value in the step 1 is preferably 2-3, the PH value in the step 3 is preferably 3-4, and the PH value in the step 4 is preferably 5-6.
4. The method for recycling the ferric trichloride etching waste liquid, which has the advantages of low investment, quick effect, high benefit and zero emission, according to claim 1, is characterized in that: the oxidant added in the step 5 is any one of air, ozone, sodium chlorate, sodium hypochlorite and hydrogen peroxide.
5. The method for recycling the ferric trichloride etching waste liquid, which has the advantages of low investment, quick effect, high benefit and zero emission, according to claim 1, is characterized in that: and (4) controlling the feeding speed in steps 2 and 4 to be 10-30L/min.
6. The method for recycling the ferric trichloride etching waste liquid, which has the advantages of low investment, quick effect, high benefit and zero emission, according to claim 1, is characterized in that: the feeding mode in the step 2 and the step 4 adopts spray feeding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010649544.6A CN111621789A (en) | 2020-07-08 | 2020-07-08 | Method for recycling ferric trichloride etching waste liquid with low investment, fast effect, high benefit and zero emission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010649544.6A CN111621789A (en) | 2020-07-08 | 2020-07-08 | Method for recycling ferric trichloride etching waste liquid with low investment, fast effect, high benefit and zero emission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111621789A true CN111621789A (en) | 2020-09-04 |
Family
ID=72270608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010649544.6A Pending CN111621789A (en) | 2020-07-08 | 2020-07-08 | Method for recycling ferric trichloride etching waste liquid with low investment, fast effect, high benefit and zero emission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111621789A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06128760A (en) * | 1992-10-16 | 1994-05-10 | Astec Irie:Kk | Method for purifying iron chloride-base waste liquid having low content of chromium ion |
| JPH09156930A (en) * | 1995-12-11 | 1997-06-17 | Tsurumi Soda Co Ltd | Treatment of ferric chloride waste liquor |
| CN1309194A (en) * | 2000-11-28 | 2001-08-22 | 华东理工大学 | Process for regenerating waste etching liquid containing Ni and FeCl3 and recovering Ni |
| CN1348020A (en) * | 2000-10-10 | 2002-05-08 | 同济大学 | Method of eliminating nickel and heavy metal ion from waste ferric chloride liquid after etching or pickling |
| CN101432463A (en) * | 2006-04-25 | 2009-05-13 | 鹤见曹达株式会社 | Etching solutions, method for regeneration of waste etching solutions and method for the recovery of valuable metals from waste etching solutions |
| CN110616328A (en) * | 2019-09-29 | 2019-12-27 | 江苏艾信环境工程有限公司 | Method for preparing iron-chromium black from chromium-containing electroplating sludge |
| CN111018192A (en) * | 2019-12-30 | 2020-04-17 | 斯瑞尔环境科技股份有限公司 | Method for preparing high-purity ferrous iron by using heavy metal ions in ferrous solution precipitated by sodium sulfide solid |
-
2020
- 2020-07-08 CN CN202010649544.6A patent/CN111621789A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06128760A (en) * | 1992-10-16 | 1994-05-10 | Astec Irie:Kk | Method for purifying iron chloride-base waste liquid having low content of chromium ion |
| JPH09156930A (en) * | 1995-12-11 | 1997-06-17 | Tsurumi Soda Co Ltd | Treatment of ferric chloride waste liquor |
| CN1348020A (en) * | 2000-10-10 | 2002-05-08 | 同济大学 | Method of eliminating nickel and heavy metal ion from waste ferric chloride liquid after etching or pickling |
| CN1309194A (en) * | 2000-11-28 | 2001-08-22 | 华东理工大学 | Process for regenerating waste etching liquid containing Ni and FeCl3 and recovering Ni |
| CN101432463A (en) * | 2006-04-25 | 2009-05-13 | 鹤见曹达株式会社 | Etching solutions, method for regeneration of waste etching solutions and method for the recovery of valuable metals from waste etching solutions |
| CN110616328A (en) * | 2019-09-29 | 2019-12-27 | 江苏艾信环境工程有限公司 | Method for preparing iron-chromium black from chromium-containing electroplating sludge |
| CN111018192A (en) * | 2019-12-30 | 2020-04-17 | 斯瑞尔环境科技股份有限公司 | Method for preparing high-purity ferrous iron by using heavy metal ions in ferrous solution precipitated by sodium sulfide solid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107324303B (en) | Method for separating refined iron and chromium from multi-metal hazardous waste | |
| CN109666800B (en) | Cobalt removing agent and application thereof | |
| AU2015339815A1 (en) | Method for removing iron in the manufacture of phosphoric acid | |
| CN113880116B (en) | Method for separating and refining fluorine-containing sodium chloride salt | |
| CN114314661B (en) | Method for producing high-purity ammonium metavanadate by deep cobalt removal of vanadium raw material | |
| CN110227702B (en) | Method for preparing flux by using chemical waste salt | |
| JP2001348627A (en) | Method for recovering heavy metal from fly ash | |
| CN111621789A (en) | Method for recycling ferric trichloride etching waste liquid with low investment, fast effect, high benefit and zero emission | |
| CN118202074A (en) | Method for removing halides from Waitz oxides | |
| CN1271781A (en) | Process for preparing gold by reduction of gold-contained chlorated liquid | |
| CN112794510A (en) | Method for harmlessly treating low-concentration manganese-containing ammonia-nitrogen wastewater in electrolytic manganese industry | |
| CN114516655B (en) | Method for producing copper hydroxide from circuit board waste | |
| CN1067867A (en) | The non-pollution producing technology of iron trichloride | |
| KR101314067B1 (en) | A refining method of tin from ITO sludge | |
| KR100227519B1 (en) | Hydrometallurgical treatment for the purification of waelz oxides through lixiviation with sodium carbonate | |
| CN114703369A (en) | Method for deeply removing lead, bismuth and tellurium in copper anode slime pretreatment slag | |
| CN107964591A (en) | A kind of method of simultaneous removing iron and vanadium in acid solution from trivalent chromium | |
| KR20120090116A (en) | Method for manufacturing zinc coating solution using high purity zinc oxide recovered from recyling secondary dust | |
| EP2888388B1 (en) | Side stream removal of impurities in electrolysis systems | |
| CN108996752B (en) | Method for recovering low-concentration nickel from nickel extraction waste water | |
| WO2005040040A1 (en) | Method for processing iron-laden spent sulfuric acid | |
| KR20000040955A (en) | Production process of high-purity copper oxide | |
| JP2007031245A (en) | Method for refining aluminum hydroxide sludge | |
| CN108640390B (en) | Treatment method of antimony-containing wastewater | |
| KR20120076781A (en) | Method for manufacturing zinc coating solution using high purity zinc oxide recovered from recyling secondary dust |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200904 |
|
| RJ01 | Rejection of invention patent application after publication |