CN1032744C - Method for clarifying tailing water - Google Patents
Method for clarifying tailing water Download PDFInfo
- Publication number
- CN1032744C CN1032744C CN 90108405 CN90108405A CN1032744C CN 1032744 C CN1032744 C CN 1032744C CN 90108405 CN90108405 CN 90108405 CN 90108405 A CN90108405 A CN 90108405A CN 1032744 C CN1032744 C CN 1032744C
- Authority
- CN
- China
- Prior art keywords
- water
- tailings water
- organic polymer
- tailings
- polymer coargulator
- 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.)
- Expired - Fee Related
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000011575 calcium Substances 0.000 claims abstract description 34
- 239000011777 magnesium Substances 0.000 claims abstract description 20
- 238000004062 sedimentation Methods 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 14
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims description 25
- 238000005189 flocculation Methods 0.000 claims description 19
- 229920000620 organic polymer Polymers 0.000 claims description 19
- -1 salt compounds Chemical class 0.000 claims description 19
- 230000016615 flocculation Effects 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 9
- 238000001556 precipitation Methods 0.000 claims description 8
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000000701 coagulant Substances 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 3
- 239000012047 saturated solution Substances 0.000 claims description 2
- 150000001767 cationic compounds Chemical class 0.000 claims 1
- 229910001411 inorganic cation Inorganic materials 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910002804 graphite Inorganic materials 0.000 abstract description 5
- 239000010439 graphite Substances 0.000 abstract description 5
- 125000002091 cationic group Chemical group 0.000 abstract description 4
- 230000001112 coagulating effect Effects 0.000 abstract description 2
- 238000006386 neutralization reaction Methods 0.000 abstract description 2
- 239000002244 precipitate Substances 0.000 abstract description 2
- 229910017053 inorganic salt Inorganic materials 0.000 abstract 1
- 230000003311 flocculating effect Effects 0.000 description 15
- 150000001875 compounds Chemical class 0.000 description 9
- 150000002500 ions Chemical class 0.000 description 7
- 239000003814 drug Substances 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000002956 ash Substances 0.000 description 5
- 239000000470 constituent Substances 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000010866 blackwater Substances 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 2
- 238000005352 clarification Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 230000003301 hydrolyzing effect Effects 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005537 brownian motion Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005591 charge neutralization Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000192 social effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A method for treating tailing water of coal dressing plant and graphite dressing plant by coagulating sedimentation method features that two kinds of flocculant are used in combination to treat tailing water. The method uses soluble inorganic salt containing calcium or magnesium as an inorganic cationic flocculant to neutralize the surface electronegativity of suspended particles in the tailing water, and uses an organic polymeric flocculant and a bridging action to flocculate the suspended particles in the tailing water after the electronegativity neutralization into larger flocs to quickly precipitate, thereby achieving the purpose of quickly separating suspended matters from water. The method is particularly suitable for treating the tailing water of coal preparation plants and graphite dressing plants.
Description
The present invention relates to a kind of coagulant sedimentation that adopts and handle coal separating plant's black water and the tailings water of graphite mill tailings water and non-ferrous metal ore and the method for paper mill tail water.
Disclose a kind of method that adopts flocculent precipitation to purify polymetallic ore slurry enrichment recirculated water among the USSR (Union of Soviet Socialist Republics) patent SU-971.811A, this method is to add Tai-Ace S 150 Al in the recirculated water of polymetallic ore slurry enrichment factory
2(SO
4)
3Make flocculation agent.The add-on of Tai-Ace S 150 is 250g/m
3And then use yellow soda ash Na
2CO
3Neutralize, the add-on of yellow soda ash is 160g/m
3, add 3kg/m at last
3Coal ash, to remove lipid acid and the water glass in anhydrating.
USSR (Union of Soviet Socialist Republics) patent SU-925.873A discloses a kind of method that adopts coagulant sedimentation to purify family and trade effluent, and this method is to adopt inorganic flocculating agent that waste water is carried out coagulating treatment, then at room temperature, with Losantin water is carried out purifying treatment.
The purpose of this invention is to provide a kind of method of utilizing inorganic flocculating agent and organic polymer coargulator to handle the tail water in dressing-works, the paper mill.
(1) makes suspended particle rapid precipitation in the mill tailings water, separate as early as possible with water.
(2) clean coal recovery, the graphite elaboration rate of recovery are improved, cleans ash reduces, and the graphite grade improves, thereby improves the economic benefit in dressing-works.
(3) suspended particle precipitates when the needed time shortens greatly in making mill tailings water, has reduced the equipment that the desilting area that requires to be increased because of " critical granularity " increases and the investment of civil engineering.
(4) solids content in mill tailings water and the paper mill tail water is reduced, ring water reusability is improved, making its water of productive use reach closed cycle has had reliable assurance.Water resources and electric power have been saved simultaneously.When necessity was discharged, compliance with environmental protection requirements reached the purpose of protecting environment.Not only improved economic benefit but also improved social benefit.
The principle of the invention: the tailings water in dressing-works is a kind of polydisperse system of complexity, fine size and have certain negative charge, therefore the repulsion effect owing to like charges forms the stable sedimentary suspensoid that is difficult between particle, also is difficult to produce flocculation sediment under the situation that adds organic polymer coargulator.
Experiment shows that salt compounds has certain throwing out for colloidalmaterial and fine particle suspended substance, and promptly salt compounds (solubility salt) can be ionized into the positively charged ion with throwing out in the aqueous solution.Positively charged ion for the suspended particle surface with negative charge have " neutralization " effect, negative " Z " current potential of its particle surface is reduced, or its electronegativity of radical change is a positive polarity, under the pedesis effect, collide between particle then, and forming little floc sedimentation, the little floc sedimentation after will " taking off steady " under " bridging " and " absorption " effect of organic polymer coargulator is condensed into bigger floc sedimentation and rapid precipitation at last.
According to the flocculation value of salt compounds and the flocculation formula (seeing formula one) that cationic valent 6 powers in the salt compounds are inversely proportional in " flocculation chemistry and flocculation agent " book.The flocculating effect that obtains the soluble salt compounds that calcium, magnesium elements constitutes again in conjunction with knowledge such as the hydrolysis of relevant ionization, ion(ic)activity (seeing formula two, three) and relevant salt is best.
Formula one (flocculation value formula)
In the formula: Fc---flocculation value
C-constant is relevant with electrolysis
The specific inductivity of D-water
K-Boltzmann constant
T-absolute temperature
A-Van der Waals constant
E-electric charge numerical value
The valency of Z-flocculation agent
Formula two (ion(ic)activity formula) ar * C
In the formula: a-ion(ic)activity
R-ionic activity coefficient
C-ionic weight-molality
Formula three (ionic activity coefficient formula)
In the formula: Y-ionic activity coefficient
Z-ionic charge
B-constant
I-ionic strength
A-ion volume parameter
According to the definition of flocculation value as can be known, flocculation value shows that more greatly the flocculating effect of this salt is poor more.
CaCl for example
2, NaCl, AlCl
3Three kinds of salt are by getting after the above flocculation value formula calculating: suppose monovalence " Na
+" flocculation value be 1, " the Ca of divalence then
++" flocculation value be 0.015625, trivalent " Al
+++" flocculation value be 0.00137, i.e. trivalent " Al
+++" flocculating effect be " na
+" 729 times, be divalence " Ca
++" 11 times, the and " Ca of divalence
++" be monovalence " Na
+" 64 times of flocculating effect.Single from the flocculation value tervalent " Al that considers that yes
+++" flocculating effect good.
But from ionized viewpoint, because of tervalent Al
+++The ionization of salt compounds in water be fractional ionization
As:
Above ionization is based on first stage ionization, below ionization at different levels weaken gradually.Therefore work as AlCl, during ionization, " the Al in its aqueous solution
+++" seldom.Because ionic effect reaches the interaction between ion and the solvent molecule, make this small part " Al simultaneously
+++" " activity " reduce.Simultaneously because " Al
+++" hydrolytic action of corresponding salt compounds, " the Al of the few part of this of generation
+++" be easy to water in (OH)
-The effect and generate difficult ionized compound or throw out, thereby further reduced " the Al in the solution
+++" concentration, its flocculating effect descends.
And the Ca of divalence
++The water-soluble back of pairing salt compounds (CaCO
3Except), in the aqueous solution, can all be ionized into ion, and hydrolytic action does not take place, its ionic activity coefficient is substantially equal to 1." the Ca of this moment
++" activity be substantially equal to the " Ca that it adds
++" weight-molality, so " Ca of divalence
++" flocculating effect of pairing soluble salt compounds is better, the Mg that in like manner also can infer divalence
++The flocculation value of pairing salt compounds is also lower, and its flocculating effect is good equally.So the salt compounds that when selecting cationic flocculant, should preferentially select for use Ca or Mg element to be constituted.
In like manner in containing the bases compound of Ca element, " the Ca after the ionization
++" ion has the charge neutralization ability equally, promptly also has better flocculation ability, only adds after the relatively large bases compound that contains the Ca element, makes (OH) in the solution
-Thereby ionic concn changes and has changed the pH value, makes its solution have stronger corrodibility and equipment and piping system are had corrosive nature.Be used with the soluble salt compounds that contains calcium or magnesium when adding an amount of bases compound that contains calcium constituent, when making its pH value control within the specific limits, have good flocculating effect equally.
Schematic diagram of the present invention is as follows:
Implementation method of the present invention:
The salt compounds that contains calcium constituent or magnesium elements (can directly add its solid particulate and also can add its saturated solution) that in tailings water, adds solubility earlier, and then add the organic polymer coargulator (order of addition of ingredients of two kinds of medicaments does not have influence to flocculating effect, can add simultaneously yet) of 0.1% concentration.Two kinds of medicaments are fully contacted with suspended particle in the tailings water, make suspended substance be flocculated bigger floc sedimentation and rapid precipitation, reach the purpose of suspended particle and water sharp separation.
Before addressed for the bases compound that contains calcium constituent when and the salt compounds that contains calcium or magnesium elements also have good flocculating effect when using jointly.In like manner also can add its solid particulate or add its solution (as milk of lime) for the bases compound that contains calcium constituent.
Soluble salt compounds and bases compound can directly add its solution also can directly add its solid, and this is because very easily dissolving, the ionization in the aqueous solution of this two compounds.And organic polymer coargulator is insoluble in water, thereby must be earlier the solid particulate of a certain amount of organic polymer coargulator be placed on fully dissolving under mechanical agitation in a spot of water, then add a certain amount of water again and be mixed with the solution of 0.1% concentration.Also can add a certain amount of organic polymer coargulator solid particulate and a certain amount of water and under mechanical agitation, directly be mixed with the solution of 0.1% concentration.
Dosing of the present invention place should be chosen in the preceding or preceding dosing of mine tailing settling tank of mine tailing thickner in dressing-works, make it in the process that enters thickner or settling tank, reach the purpose that medicament and mine tailing particle fully contact, thereby suspended particle is precipitated quickly, reach and the isolating as early as possible purpose of water.
Implement medicament ratio range of the present invention and condition:
The pH value of tailings water and temperature are little for implementation result influence of the present invention, therefore can implement the present invention in the tailings water of state of nature.
Our experiments show that: " Ca in the tailings water
++" " Mg
++" dosage influence the solids content of its primary water, i.e. " the Ca that adds when tailings water
++" " Mg
++" when concentration was big, the solids content in its clear liquor was lower, as " Ca
++", " Mg
++" the solids content in hour its clear liquor is higher for concentration.As " Ca
++" or " Mg
++" when concentration reaches 40 mg/litre, under the effect of organic polymer coargulator, have a significant effect.
Experiment shows that the dosage of organic polymer coargulator influences the sedimentation speed of the throw out of the suspended particle in the tailings water, i.e. " Ca in the tailings water
++" or " Mg
++" regularly the concentration of organic polymer coargulator is bigger for content one; sedimentation speed of its throw out is faster; on the contrary then sedimentation speed is slower; and just have a significant effect when organic polymer coargulator concentration reaches 3PPM in the tailings water; when continuing to increase its concentration, the sedimentation speed of its floc sedimentation is also just fast.
The Different Effects effect of above two kinds of medicaments just combined to implement the present invention better.
Certainly different black water or tailings water has different character, and is not equal as proportion, concentration and the cationic content of wherein fine-graded percentage composition difference, suspended particle, even add " the Ca with amount
++" or " Mg
++" and organic polymer coargulator, and its sedimentation effect is also different, thereby different tailings water is when reaching best sedimentation effect, the best proportioning of medicament is also different.
Most preferred embodiment of the present invention:
(1) the tail coal water concentration is 42 mg/litre, and ash content is 82,73% ,-400
#Content is 96.34%, and ash content is 85.40%, and the ionic concn of the solubility salt in the tail coal water is " Ca
++" be 11.6 mg/litre, " Mg
++" be 2.6 mg/litre, K
++ Na
+Be 131.7 mg/litre, as the Mg that adds
++Content reaches 110 mg/litre, and when the dosage of organic polymer coargulator polyacrylamide was 10PPM, the solids content in its clear liquor was 230 mg/litre, and this moment, the settling height of throw out was 170mm (height of precipitation after 1 minute in the 500ml measuring cup).The best results of this moment, solids content has reached national requirements for environmental protection.The floc sedimentation sedimentation speed of this moment is the fastest.
(2) the tail coal water concentration is 42 mg/litre, and ash content is 82.73% ,-400
#Content is 96.34%, and ash content is 85.40%, and the ionic concn of the solubility salt in the tail coal water is " Ca
++" be 11.6 mg/litre, " Mg
++" be 2.6 mg/litre, K
++ Na
+Be 131.7 mg/litre, when milk of lime that adds and the salt compounds that contains calcium constituent, make its calcium ion content reach 106 ' mg/litre, the dosage of organic polymer coargulator polyacrylamide still is 10PPM, solids content in the clear liquor is 300 mg/litre at this moment, and the precipitation of the throw out of this moment highly is 165mm (precipitating the height after 1 minute).The pH value of the clear liquor of this moment is 9.5.
Above most preferred embodiment is a best effect, this moment, two kinds of reagent consumptions were all bigger, and can suitably reduce reagent consumption according to different mine tailing character and to the multiplexing different mass requirement of tailings water actually, reach the processing requirement that can make tailings water satisfy round-robin, reduced reagent consumption again, thereby made its economical effectiveness and social effect reach optimum value.
The best working concentration of implementing organic polymer coargulator polyacrylamide when of the present invention is 0.1%, and this moment, flocculating effect was best, but when its working concentration fluctuates in 0.01～0.2% scope, still had flocculating effect equally.
The dosage that contains the soluble compound of calcium or magnesium elements, in making tailings water calcium or magnesium ion content reach 40 milligrams/just have flocculating effect when (rising tailings water).The content of its calcium or magnesium ion is big more, and its flocculating effect is good more.
Implement behind the present invention mine tailing water clarification expense is descended significantly, as black water, every cubic metre of tail coal water clarification expense is between 0.04～0.10 yuan.Therefore it is simple to implement its treatment facility of the present invention, and processing cost is low.
Claims (2)
1, a kind of method that adopts coagulant sedimentation to handle tailings water, it is characterized in that in the tailings water at normal temperatures adding the solid salt compounds that contains calcium or magnesium elements or its full close solution go as the inorganic cation flocculation agent in and the surperficial electronegativity of suspended particles in the tailings water, the organic polymer coargulator that adds 0.01%-0.2% concentration then, make the salt compounds solution thorough mixing that contains calcium or magnesium elements of itself and tailings water and adding, make that suspended particles flocculate bigger floc sedimentation and rapid precipitation in the tailings water under the bridge linking effect of organic polymer coargulator.
2, a kind of method that adopts coagulant sedimentation to handle tailings water as claimed in claim 1, it is characterized in that adding in the tailings water at normal temperatures solid salt compounds or its saturated solution and the milk of lime that contains calcium or magnesium elements, the organic polymer coargulator polyacrylamide thorough mixing that adds 0.01%-0.2% concentration, make that suspended particles flocculate bigger floc sedimentation and rapid precipitation in the tailings water under the bridge linking effect of organic polymer coargulator polyacrylamide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108405 CN1032744C (en) | 1990-10-12 | 1990-10-12 | Method for clarifying tailing water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108405 CN1032744C (en) | 1990-10-12 | 1990-10-12 | Method for clarifying tailing water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1060450A CN1060450A (en) | 1992-04-22 |
| CN1032744C true CN1032744C (en) | 1996-09-11 |
Family
ID=4880986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90108405 Expired - Fee Related CN1032744C (en) | 1990-10-12 | 1990-10-12 | Method for clarifying tailing water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1032744C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034861C (en) * | 1993-08-30 | 1997-05-14 | 河南电力试验研究所 | Method for recycling overflow ash water of concentration tank |
| CN100540479C (en) * | 2007-04-05 | 2009-09-16 | 倪志群 | A sewage treatment device |
| CN101318743B (en) * | 2007-06-08 | 2011-06-29 | 鞍钢集团矿业公司 | Wastewater treatment method for lean iron ore sorting factory |
| CN102225377A (en) * | 2011-04-28 | 2011-10-26 | 花垣县强桦矿业有限责任公司 | Method for flocculating tailings obtained after flotation process of low-grade manganese carbonate ore |
| CN103272704B (en) * | 2013-06-14 | 2015-05-20 | 长沙矿冶研究院有限责任公司 | Selective flocculation desliming mineral separation process and treatment method for mud produced by selective flocculation desliming mineral separation process |
| CN103723809A (en) * | 2013-12-16 | 2014-04-16 | 裴寿益 | Treatment method for tin ore dressing wastewater |
| CN104478123A (en) * | 2014-11-26 | 2015-04-01 | 广东省工业技术研究院(广州有色金属研究院) | Method for treating mercury-containing mineral processing tail water |
| CN104876310B (en) * | 2015-04-23 | 2017-06-13 | 太原钢铁(集团)有限公司 | A kind of method for improving microfine iron ore mine backwater water quality |
| CA3051124A1 (en) * | 2017-01-31 | 2018-08-09 | Extrakt Process Solutions, Llc | Treatment of aqueous compositions including fines |
| US12129192B2 (en) | 2017-01-31 | 2024-10-29 | Extrakt Process Solutions, Llc | Treatment of tailings |
| CA3106360A1 (en) * | 2018-07-17 | 2020-01-23 | Extrakt Process Solutions, Llc | Treatment of tailings |
-
1990
- 1990-10-12 CN CN 90108405 patent/CN1032744C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1060450A (en) | 1992-04-22 |
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