CN106191436B - Improve the copper extraction process of copper recovery - Google Patents
Improve the copper extraction process of copper recovery Download PDFInfo
- Publication number
- CN106191436B CN106191436B CN201610834578.6A CN201610834578A CN106191436B CN 106191436 B CN106191436 B CN 106191436B CN 201610834578 A CN201610834578 A CN 201610834578A CN 106191436 B CN106191436 B CN 106191436B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/02—Apparatus therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0063—Hydrometallurgy
- C22B15/0084—Treating solutions
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/26—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a kind of copper extraction process for improving copper recovery, the copper extraction system used in technique includes two-stage extraction cells, back extraction equipment and intermediate storage tank, extraction cells include extraction equipment and storage tank, extraction equipment is connected with input duct and Drainage pipe, and intermediate storage tank is connected to the input duct of the Drainage pipe of level-one extraction equipment and second level extraction equipment respectively；Extraction equipment is connected to form a circulation with water phase outlet pipe by water phase inlet pipe with storage tank；A circulation is joined together to form by pipeline between extraction equipment and back extraction equipment；Copper extraction is carried out using the extracting system.The copper extraction process system structure used is simple, process flow is succinct, operation is easy, copper recovery is high, at low cost.Extraction process of the invention reduces raffinate copper concentration, increases the ability of organic extractant phase copper, while maintaining the ability of organic extractant phase iron almost unchanged, improves the copper recovery of extraction process and the production efficiency of extraction equipment.
Description
Technical field
The invention belongs to wet type copper smelting technical fields, are related to a kind of technique of copper extraction, and in particular to a kind of raising copper time
The copper extraction process of yield.
Background technique
Successful utilization with copper hydrometallurgical processes (leaching-Extraction electrodeposition) in world mine, metal ion are molten
Agent abstraction technique has obtained unprecedented development, and application has spread over the fields such as wastewater treatment and waste metal recycling.Extracted
The metal species taken are more and more, and the ingredient for extracting feed liquid becomes increasingly complex, and concentration of metal ions range also constantly expands in feed liquid
Exhibition.For the solvent extraction of copper, in low-grade mine leachate, copper ion concentration only has 0.2-0.5g/l, but prints
In the etching waste liquor of circuit board factory (PCB factory), copper ion concentration can be up to 120-160g/l.Feed liquid is different, the extraction of use
Technique is with regard to different.
Traditional two-stage extraction level-one stripping process (2E+1S) is as shown in Fig. 3 in Figure of description:
Extraction feed liquid continuously passes through the extraction of E1 and E2 two-stage, and copper ion therein is extracted into load organic phases.
Back extraction lean solution continuously flows into back extraction equipment S, and the copper ion in load organic phases is stripped again into back extraction rich solution, simultaneously
Organic phase is regenerated.Flow-rate ratio of the ratio of organic phase flow and feed liquid flow extraction section.When extraction feed liquid in copper from
Son it is dense when, limited by the copper max load of organic phase, only increase organic phase flow could by the copper in feed liquid from
It is sub to be all extracted into organic phase.If the copper concentration of feed liquid is 120g/l, the copper max load of organic phase is 16g/l, then extracts
It takes the flow-rate ratio of section to have to be larger than 7.5 to be likely to the copper extraction in feed liquid completely.But in industrialized production, organic phase
Always with water phase
By volume close to 1:1 mixing (mixing chamber is compared close to 1), best mixed effect can not only be obtained in this way, together
When be also convenient for control it is mutually continuous, obtain best split-phase effect.When extraction section flow is relatively high, extraction process just needs water phase
It flows back to maintain mixing chamber to compare near 1.The water phase flowed out from E1 is returned to one by 2E+1S technique of the extraction section with aqueous-phase reflux
Part increases the water phase flow of inflow extraction equipment E1 into extraction feed liquid, to reduce the flow-rate ratio of E1.Valve tune can be used
The flow of section reflux water phase is compared with controlling mixing chamber in E1 close to 1.Aqueous-phase reflux is also applied for E2, the reflux aqueous phase stream of E2
Amount can also use valve regulated.The drawbacks of extraction section aqueous-phase reflux, is that the copper ion in feed liquid is diluted, and hydrogen ion concentration but exists
Increase, therefore reduce the extraction copper ability of organic phase, the copper ion concentration in load organic phases can reduce, the load factor of organic phase
It can decline.Since the process conditions of stripping section do not change, back extraction ratio will not change, so as to cause the net copper transfer of technique
The copper recovery of amount decline, extracting system reduces.
There are commonly mixer-settler and centrifugal extractors etc. for extraction equipment.Existing mixer-settler be it is flat, such as say
In bright book attached drawing shown in Fig. 4: water phase liquid level in clarifying chamber is minimum can only to drop to D point (the following are water phases for dotted line in figure), D point
Water phase below cannot release, and have many water phases that cannot be discharged in clarifying chamber.
Summary of the invention
The purpose of the present invention is providing in view of the above problems, a kind of process flow is succinct, operation is easy, copper recovery is high
Copper extraction process.
Technical solution used for the above purpose is: a kind of copper extraction process improving copper recovery, in technique
The copper extraction system of use includes that two-stage extraction cells, back extraction equipment and intermediate storage tank, the extraction cells include extraction equipment
And storage tank, the extraction equipment are connected with input duct and Drainage pipe, the intermediate storage tank respectively with level-one extraction equipment
Drainage pipe is connected to the input duct of second level extraction equipment；Extraction equipment and the storage tank pass through water phase inlet pipe and water phase outlet pipe
Connection forms a circulation, and the water phase in extraction equipment is entered in storage tank by water phase inlet pipe, and the water phase in storage tank passes through water phase
Outlet pipe returns in extraction equipment；It is joined together to form between the extraction equipment and back extraction equipment of two-stage extraction cells by pipeline
One circulation；Valve is mounted in the input duct, Drainage pipe, water phase inlet pipe and water phase outlet pipe；
Copper extraction process includes the following steps:
1) copper extraction feed liquid is diluted with water 1~5 times, fills intermediate storage tank；
2) the extraction feed liquid after being packed into organic phase, water or dilution in the extraction equipment of two-stage extraction cells, is being stripped
Organic phase and back extraction lean solution are packed into equipment；
3) valve in the input duct and water phase inlet pipe of two-stage extraction cells is opened, Drainage pipe and water phase outlet pipe are closed
On valve；
4) extracting system is run, control the flow in two input ducts: organic phase flow: back extraction lean solution flow is 1:1:
1；
5) when two storage tanks of two-stage extraction cells are filled, the valve in two input ducts is closed, opens two water
Valve in phase outlet pipe, control the flow in two water phase outlet pipes: organic phase flow: back extraction lean solution flow is 1:1:1, after reforwarding
Row extracting system；
6) when the copper ion concentration in the storage tank of second level extraction cells reaches emission request, two water phase inlet pipes are closed
On valve, open valve on two Drainage pipes qualified raffinate be discharged and close two water phases when storage tank empties fastly and go out
Valve on pipe and Drainage pipe, opens the valve on two input ducts and water phase inlet pipe；
7) step 4) is repeated to 6) until having handled extraction feed liquid to be processed.
In the above-mentioned technical solutions, the extraction equipment is mixer-settler, and the mixer-settler is by first baffle, the
Two baffles are successively divided into mixing chamber, clarifying chamber and aqueous compartment, and the bottom of the clarifying chamber and aqueous compartment is from close to the one of mixing chamber
The side of laterally closer aqueous compartment extends to form an inclined-plane gradually downward；The upper end of the first baffle is A point, lower end B
Point, the upper end of the second baffle are C point, and lower end is D point, and the D point is lower than the B point, and is higher than the water outlet of aqueous compartment.
In the above-mentioned technical solutions, the volume of the storage tank of the two-stage extraction cells is equal, the volume of the intermediate storage tank
Equal to the volume that the volume of the storage tank of extraction cells adds clarifying chamber's half.
Copper extraction feed liquid fills intermediate storage tank after being diluted with water 1 times in the step 1).
The organic phase being packed into the extraction equipment of two-stage extraction cells in the step 2): the extraction material after water or dilution
The volume ratio of liquid is 1:1~2, and the volume ratio of the organic phase and back extraction lean solution that are packed into back extraction equipment is 1:1~2.
The beneficial effects of the present invention are: the copper extraction process system structure used is simple, process flow is succinct, operation is held
Easily, copper recovery is high, at low cost.Extraction process of the invention reduces raffinate copper concentration, increases organic extractant phase copper
Ability, while maintaining the ability of organic extractant phase iron almost unchanged, improve the copper recovery and extraction equipment of extraction process
Production efficiency.Using present invention process, level-one stripping process is extracted relative to traditional two-stage, copper recovery, which can be improved, is more than
10%, the rate of recovery improves clearly, and significant effect has saved cost, increased benefit.
Detailed description of the invention
Fig. 1 is copper extraction system structural schematic diagram used in the present invention.
Fig. 2 is the structural schematic diagram of the extraction equipment mixer-settler in Fig. 1.
Fig. 3 is the traditional two-stage extraction level-one stripping process flow chart of background technology part.
Fig. 4 is the structural schematic diagram of the existing mixer-settler of background technology part.
Specific embodiment
Embodiment one, building copper extraction system
As shown in Figure 1, 2, copper extraction system used in the present invention is mainly by two-stage extraction cells 1, intermediate storage tank 9 and anti-
Extract equipment 2 to form.Extraction cells 1 are made of extraction equipment 3 and storage tank 4, and the extraction equipment 3 of two-stage extraction cells 1 and back extraction are set
A circulation is joined together to form by pipeline between standby 2.Extraction equipment 3 is connected with input duct 5 and Drainage pipe 6, extraction
Equipment 3 is taken to be connected to one circulation of formation with water phase outlet pipe 8 by water phase inlet pipe 7 with storage tank 4, the water phase in extraction equipment 3 passes through
Water phase inlet pipe 7 enters in storage tank 4, and the water phase in storage tank 4 is returned in extraction equipment 3 by water phase outlet pipe 8.Input duct 5, drain
Valve is mounted in pipeline 6, water phase inlet pipe 7 and water phase outlet pipe 8.The drain pipe with level-one extraction equipment 3 respectively of intermediate storage tank 9
Road 6 is connected to the input duct 5 of second level extraction equipment 3.The volume of the storage tank 4 of two-stage extraction cells 1 is equal, the intermediate storage tank
The volume that 9 volume is equal to the storage tank 4 of extraction cells 1 adds the volume of clarifying chamber 3d half.
Extraction equipment 3 is mixer-settler, and mixer-settler is successively divided into mixing chamber by first baffle 3a, second baffle 3b
A laterally closer water of the bottom 3f of 3c, clarifying chamber 3d and aqueous compartment 3e, clarifying chamber 3d and aqueous compartment 3e from close mixing chamber 3c
The side of phase room 3e extends to form an inclined-plane gradually downward；The upper end of first baffle 3a is A point, and lower end is B point, second baffle
The upper end of 3b is C point, and lower end is D point, and D point is lower than B point, and is higher than the water outlet 3g of aqueous compartment 3e.Water phase in clarifying chamber 3d
Liquid level is minimum can only to drop to D point, and D point water phase below cannot release, and clarifying chamber and aqueous compartment flat are changed to by original
Wedged bottom, greatly reduce in clarifying chamber cannot discharged water phase volume, improve the operational efficiency of extraction process.
This extracting system is suitable for only handling a kind of feed liquid of concentration.Feed liquid after filling dilution in intermediate storage tank first
(extension rate is 1-5 times).Then open input duct on valve, open equipment operation, organic phase two-stage extraction equipment,
Back extraction equipment room circulates, and the feed liquid after feed liquid and dilution respectively enters in the extraction equipment of two-stage extraction cells, enters back into
In storage tank, the valve in input duct is closed when storage tank is filled, the water phase in two-stage extraction cells is in extraction equipment and storage tank
In circulate.When the copper ion concentration in the extraction cells storage tank of the second level reaches emission request, copper in intermediate storage tank from
Son also reaches concentration of emission, closes the valve on storage tank water phase inlet pipe at this time, opens the valve row on extraction equipment Drainage pipe
Qualified raffinate out, while intermediate storage tank is filled, and when two-stage extraction cells storage tank empties fastly, closes the valve in water phase outlet pipe
Valve on door, opening input duct, is again introduced into feed liquid, carries out new processing cycle, so circulation has been reached even
Continuous production.
Embodiment two, operation copper extraction process
Using the copper extraction system in embodiment one, copper extraction process is run, is operated in accordance with the following steps:
1) copper extraction feed liquid 1 times is diluted with water (to select extension rate according to actual needs, 1~5 times, belong to existing
Have technology, do not repeat), fill intermediate storage tank 9；
2) it is 1:1 that volume ratio is packed into the extraction equipment 3 of two-stage extraction cells 1 (1:1~2 are the prior art)
Organic phase and water (or dilution after extraction feed liquid), it is that (1:1~2 are 1:1 that volume ratio is packed into back extraction equipment 2
The prior art) organic phase and back extraction lean solution；It include copper extractant, modification agent, diluent in organic phase, the modification agent is ester
One of class, phenols, alcohols, ethers are a variety of, and the diluent is the isoparaffin of C13~16 (hydrotreated kerosene, sulfonated coal
Oil).
3) valve in the input duct 5 and water phase inlet pipe 7 of two-stage extraction cells 1 is opened, Drainage pipe 6 and water phase are closed
Valve in outlet pipe 8；
4) run extracting system, control the flow in two input ducts 5: organic phase flow: back extraction lean solution flow is 1:
1:1；
5) when two storage tanks 4 of two-stage extraction cells 1 are filled, the valve in two input ducts 5 is closed, opens two
Valve in water phase outlet pipe 8, control the flow in two water phase outlet pipes 8: organic phase flow: back extraction lean solution flow is 1:1:1, after
Reforwarding row extracting system；
6) when the copper ion concentration in the storage tank 4 of second level extraction cells 1 reaches emission request, close two water phases into
Valve on pipe 7 opens the valve on two Drainage pipes 6 and qualified raffinate is discharged, when raffinate is drained fastly, closes two
Valve in water phase outlet pipe 8 and Drainage pipe 6 opens the valve on two input ducts 5 and water phase inlet pipe 7；
7) step 4) is repeated to 6) until having handled extraction feed liquid to be processed.
In present invention process, the first cycling extraction in first order extraction cells of a certain amount of extraction feed liquid works as copper ion
Just enter the second level extraction cells when concentration reaches setting value, further cycling extraction, raffinate in the extraction cells of the second level
It is discharged by Drainage pipe；Then new extraction feed liquid enters first order extraction cells and starts new extraction cycle, and feed liquid is extracting
Copper ion concentration reaches setting value, ability completion processing after multiple circular treatment in unit；New extraction feed liquid is entered back into carry out
Processing, so circulation carry out continuous production.Present invention process reduces the copper ion concentration in raffinate, hence it is evident that improves copper and returns
Yield.
Embodiment three carries out copper extraction
According to the copper extraction process extracting copper in embodiment two, 6 groups of experiments are carried out, using present invention process and traditional
Two-stage extracts the comparison of level-one stripping process, and from the experimental results, present invention process compares traditional handicraft, and copper recovery can mention
High several percentage points, highest can be improved more than 10 percentage points, and effect is very significant.
Experiment 1
Organic phase: 30%Mextral5640H
Extraction feed liquid: 15g/l Cu, 10g/l Fe, pH=1.5 (be formulated by copper sulphate and ferric sulfate, sulfuric acid and
NaOH tune pH value)
Electrodeposition lean solution: 30g/l Cu, 190g/l sulfuric acid (being formulated by sulfuric acid and copper sulphate)
Experiment 2
Organic phase: 30%Mextral5640H
Extraction feed liquid: 30g/l Cu, 10g/l Fe, pH=1.5 (be formulated by copper sulphate and ferric sulfate, sulfuric acid and
NaOH tune pH value)
Electrodeposition lean solution: 30g/l Cu, 190g/l sulfuric acid (being formulated by sulfuric acid and copper sulphate)
Experiment 3
Organic phase: 30%Mextral5640H
High-copper feed liquid: 30g/l Cu, 10g/l Fe, pH=1.5 (be formulated by copper chloride and ferric sulfate, hydrochloric acid and
NaOH tune pH value)
Electrodeposition lean solution: 30g/l Cu, 190g/l sulfuric acid (being formulated by sulfuric acid and copper sulphate)
Experiment 4
Organic phase: 25%Mextral5640H
Extract feed liquid: 50g/l Cu, 10g/l Fe, pH=1.5 (are formulated, hydrochloric acid and hydrogen by copper chloride and ferric sulfate
Sodium oxide molybdena tune pH value)
Electrodeposition lean solution: 30g/l Cu, 190g/l sulfuric acid (being formulated by sulfuric acid and copper sulphate)
Experiment 5
Organic phase: 25%Mextral5640H
Extract feed liquid: 38g/l Cu, 10g/l Fe, pH=1.5 (are formulated, sulfuric acid and hydrogen by copper sulphate and ferric sulfate
Sodium oxide molybdena tune pH value)
Electrodeposition lean solution: 30g/l Cu, 190g/l sulfuric acid (being formulated by sulfuric acid and copper sulphate)
Experiment 6
Organic phase: 25%Mextral5640H
Extract feed liquid: 34g/l Cu, 10g/l Fe, 71g/l Cl, pH=1.5 (are matched by copper chloride, sodium chloride and ferric sulfate
It makes, hydrochloric acid and NaOH tune pH value)
Electrodeposition lean solution: 30g/l Cu, 190g/l sulfuric acid (being formulated by sulfuric acid and copper sulphate)
Experiment 7
Organic phase: 26%Mextral5640H
Extraction feed liquid: 35g/l Cu, 10g/l Fe, pH=1.5 (be formulated by copper chloride and ferric sulfate, hydrochloric acid and
NaOH tune pH value)
Electrodeposition lean solution: 30g/l Cu, 190g/l sulfuric acid (being formulated by sulfuric acid and copper sulphate)
Claims (3)
1. a kind of copper extraction process for improving copper recovery, which is characterized in that the copper extraction system used in technique includes two-stage
Extraction cells (1), back extraction equipment (2) and intermediate storage tank (9), the extraction cells (1) include extraction equipment (3) and storage tank (4),
The extraction equipment (3) is connected with input duct (5) and Drainage pipe (6), and the intermediate storage tank (9) sets with level-one extraction respectively
The Drainage pipe (6) of standby (3) is connected to the input duct (5) of second level extraction equipment (3)；Extraction equipment (3) and the storage tank (4)
One circulation of formation is connected to water phase outlet pipe (8) by water phase inlet pipe (7), the water phase in extraction equipment (3) passes through water phase inlet pipe
(7) enter in storage tank (4), the water phase in storage tank (4) is returned in extraction equipment (3) by water phase outlet pipe (8)；Two-stage extraction cells
(1) circulation is joined together to form by pipeline between extraction equipment (3) and back extraction equipment (2)；The input duct
(5), valve is mounted in Drainage pipe (6), water phase inlet pipe (7) and water phase outlet pipe (8)；
The extraction equipment (3) be mixer-settler, the mixer-settler by first baffle (3a), second baffle (3b) successively
Be divided into mixing chamber (3c), clarifying chamber (3d) and aqueous compartment (3e), the bottom (3f) of the clarifying chamber (3d) and aqueous compartment (3e) from
Side close to a laterally closer aqueous compartment (3e) of mixing chamber (3c) extends to form an inclined-plane gradually downward；The first gear
The upper end of plate (3a) is A point, and lower end is B point, and the upper end of the second baffle (3b) is C point, and lower end is D point, and the D point is lower than
The B point, and it is higher than the water outlet (3g) of aqueous compartment (3e)；
Copper extraction process includes the following steps:
1) copper extraction feed liquid is diluted with water 1~5 times, fills intermediate storage tank (9)；
2) the extraction feed liquid after being packed into organic phase, water or dilution in the extraction equipment (3) of two-stage extraction cells (1), anti-
Extract and is packed into organic phase and back extraction lean solution in equipment (2)；The organic phase being packed into extraction equipment (3): the extraction after water or dilution
The volume ratio of feed liquid is 1:1~2, and the volume ratio of the organic phase of loading and back extraction lean solution is 1:1~2 in back extraction equipment (2)；
3) open two-stage extraction cells (1) input duct (5) and water phase inlet pipe (7) on valve, closing Drainage pipe (6) and
Valve in water phase outlet pipe (8)；
4) extracting system is run, control the flow in two input ducts (5): organic phase flow: back extraction lean solution flow is 1:1:
1；
5) when two storage tanks (4) of two-stage extraction cells (1) are filled, the valve on two input ducts (5) is closed, opens two
Valve in root water phase outlet pipe (8) controls the flow in two water phase outlet pipes (8): organic phase flow: back extraction lean solution flow is 1:
1:1 continues to run extracting system；
6) when the copper ion concentration in the storage tank (4) of second level extraction cells (1) reaches emission request, close two water phases into
The valve on (7) is managed, the valve on two Drainage pipes (6) is opened and qualified raffinate is discharged, when storage tank (4) empties fastly, close
The valve on two water phase outlet pipes (8) and Drainage pipe (6) is closed, the valve on two input ducts (5) and water phase inlet pipe (7) is opened
Door；
7) step 4) is repeated to 6) until having handled extraction feed liquid to be processed.
2. the copper extraction process according to claim 1 for improving copper recovery, which is characterized in that the two-stage extraction cells
(1) volume of storage tank (4) is equal, and the volume that the volume of the intermediate storage tank (9) is equal to the storage tank (4) of extraction cells (1) adds
The volume of upper clarifying chamber (3d) half.
3. the copper extraction process according to claim 1 for improving copper recovery, which is characterized in that copper extracts in the step 1)
Feeding liquid fills intermediate storage tank (9) after being diluted with water 1 times.
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|---|---|---|---|
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839379A (en) * | 2012-09-26 | 2012-12-26 | 重庆康普化学工业有限公司 | On-line treatment method of acidic etching solution |
| CN203794625U (en) * | 2014-04-16 | 2014-08-27 | 重庆浩康医药化工集团有限公司 | Mixing and settling tank for producing metal sulfate solids |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5670035A (en) * | 1995-06-06 | 1997-09-23 | Henkel Corporation | Method for recovering copper |
| US7214256B2 (en) * | 2002-09-03 | 2007-05-08 | Cognis Corporation | Solvent extraction process |
| CN101935758B (en) * | 2010-09-10 | 2012-07-04 | 中国恩菲工程技术有限公司 | Extracting equipment |
-
2016
- 2016-09-18 CN CN201610834578.6A patent/CN106191436B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839379A (en) * | 2012-09-26 | 2012-12-26 | 重庆康普化学工业有限公司 | On-line treatment method of acidic etching solution |
| CN203794625U (en) * | 2014-04-16 | 2014-08-27 | 重庆浩康医药化工集团有限公司 | Mixing and settling tank for producing metal sulfate solids |
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