WO2006032727A1 - Process for the preparation of an adsorbent material containing iron oxyhydroxide, adsorbent material and the use thereof - Google Patents
Process for the preparation of an adsorbent material containing iron oxyhydroxide, adsorbent material and the use thereof Download PDFInfo
- Publication number
- WO2006032727A1 WO2006032727A1 PCT/FI2005/000403 FI2005000403W WO2006032727A1 WO 2006032727 A1 WO2006032727 A1 WO 2006032727A1 FI 2005000403 W FI2005000403 W FI 2005000403W WO 2006032727 A1 WO2006032727 A1 WO 2006032727A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- adsorbent material
- weight
- granules
- iron oxyhydroxide
- mass
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3028—Granulating, agglomerating or aggregating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3035—Compressing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Definitions
- the invention relates to a process for preparing an adsorbent material containing iron oxyhydroxide FeO(OH). Further, the invention relates to an adsorbent material containing iron oxyhydroxide FeO(OH) useful for removing arsenic, heavy metals and/or phosphorus from aqueous solutions thereof.
- Arsenic and heavy metals are very toxic, thus presenting a serious hazard to people and the environment.
- Arsenic and heavy metals in the soil are a cause of pollution in numerous sites all over the world.
- Typical sites polluted by heavy metals include former industrial areas, landfills, and shooting ranges.
- Heavy metal contamination of the soil in such sites may be very high. Normally, some dissolution of these heavy metals in water takes place, and accordingly, they may for instance be dissolved in rain water. Depending on the migration thereof, dissolved heavy metals cause pollution in ground or surface water bodies.
- waste waters both in solid and in liquid forms are found in waste waters.
- waste waters are conventional methods for removing phosphorus from municipal waste waters, but waste waters are not always treated for phosphorus removal in sparsely populated areas. These waste waters may be released in the environment without any previous treatment.
- water streams containing phosphorus may also be washed from fields and reach lakes or the sea without any treatment. In agriculture, great amounts of phosphorus are used as fertilizers applied to the fields. Such waste waters cause eutrophication of water bodies.
- arsenic and heavy metals may be removed from an aqueous solution by filtering through a solid layer comprising iron(lll) oxide and/or iron(lll) hydroxide. Such processes are particularly designed for applications for arsenic removal.
- Arsenic is present in the ground water as As(III) and As(V) form, at various ratios. In deep wells with less oxygen, the dominant form is normally As(III). Most processes for arsenic removal only remove As(V) efficiently. For this reason, a pretreatment is used for oxidizing the arsenite to the arsenate form. Oxygen, ozone, free chlorine, hypochlorite, permanganate, hydrogen peroxide, or Fenton's reagent may be used for this oxidation.
- Arsenic may be removed from drinking water by coagulation, or adsorption.
- alum AI 2 (SO 4 ) 3 ferric chloride FeCI 3 or ferric sulphate Fe 2 (S ⁇ 4 ) 3 -7H 2 O may be used as coagulants.
- arsenic is more efficiently removed by ferric salts than by alum, and further, ferric salts may be used in wider pH ranges.
- the pentavalent arsenic may be more effiently removed than the trivalent arsenic.
- Published application US 2002/0070172 A2 discloses a granular adsorbent reported to be particularly suitable for arsenic removal from aqueous solutions.
- Said granules contain iron oxide and/or iron oxyhydroxide.
- Said granules are typically produced by adding sodium hydroxide to a ferrous sulphate solution, followed by oxidation of the suspension thus obtained with air. The resulting suspension is filtered and washed to give a pasty filter cake, which is then dried to a moisture content of for instance 3 % by weight.
- the solid, very hard product thus obtained consisting of iron oxyhydroxide is then comminuted e.g. to a grain size between 0.5 and 2 mm.
- Said granules may also be produced by forcing the pasty filter cake through a perforated plate to form strands, and thereafter, said strands are dried to a moisture content of e.g. 3 % by weight, and comminuted.
- the products obtained are said to have a large specific surface area.
- the patent application WO 97/38944 of the present applicant discloses a process for producing a pure product containing ferric iron.
- the starting material comprises hydrous ferrous sulphate obtained as a by ⁇ product in the process for producing titanium dioxide.
- Said ferrous sulphate is oxidized using oxygen in a pressurized vessel, at elevated temperatures.
- the ferrous salt is dissolved by its own crystal water, this dissolution being associated with the simultaneous precipitation of hydronium jarosite.
- the reaction equation is as follows:
- EP 0 997 436 of the present applicant presents a method for processing the by-product obtained in the above hydronium jarosite production process, that is, the impure ferric sulphate solution, to give a solution containing ferric iron useful for water treatment.
- a base is added to said impure ferric sulphate solution to elevate the pH initially having a typical value of about 1 to a value between about 2 and 5, preferably between about 3 and 4, to precipitate ferric hydroxide, or more specifically ferric oxyhydroxide.
- the precipitate may be separated by filtration. Thereafter, this precipitate may for instance be used for producing an iron chemical suitable for waste water treatment by dissolving the precipitate in an acid, particularly in nitric acid.
- Said method may also comprise a second precipitation step for precipitating an impurity metal such as manganese dioxide.
- an oxidizing agent and a base are added to the solution to elevate the pH to a value between about 6 and 10, preferably about 8 and 9.
- MgO, Mg(OH) 2 , MgCO 3 , NH 3 , NaOH, or KOH may be used as bases.
- the object of the invention is to provide an adsorbent material containing iron oxyhydroxide, said adsorbent material efficiently adsorbing arsenic, heavy metals and/or phosphorus, being not substantially slurried in water, and having excellent mechanical properties.
- a process for producing an adsorbent material containing iron oxyhydroxide wherein an iron oxyhydroxide mass having a moisture content of 5 - 15 % by weight is produced, said mass is granulated by compaction, followed by comminution and sieving of the compacted product to give product granules with grain sizes ranging between 0.5 and 4 mm.
- Said iron oxyhydroxide mass having a moisture content of 5 - 15 % by weight is a powder or substantially a powder.
- said moisture content acts as a "binding agent".
- the moisture content is preferably from 7 to 15 % by weight, more preferably from 7 to 13 % by weight.
- the compaction may be carried out by compressing the mass to be granulated to give a shaped body, and the comminution may be carried out by crushing the shaped body.
- the mass to be granulated is compacted between two rotating rolls to obtain a sheet.
- a preferable apparatus comprises a compactor wherein the mass to be granulated is forced by means of a screw conveyor between two rotating rolls for compressing the mass to a sheet.
- the sheet is crushed for instance using a hammer crusher, followed by sieving the crushed granules through a vibration sieve to give the desired size class (e.g. from 1 to 2 mm, and from 2 to 4 mm).
- Fine particles e.g. less than 1 mm
- coarse material e.g. more than 4 mm
- the strength of the product granules may be influenced by the compression force.
- the force is regulated by adjusting the roll nip and the rotation speed of the screw conveyor.
- the grain size of the product passed to the sieve is determined by the mesh size of the net on the bottom of the crusher.
- the compressive force is preferably between 40 and 160 kN.
- the grain size preferably at least 50 % by weight of the granules of the product belong to one or two of the following size classes: 0.5 - 1 mm, 1 - 2 mm, and 2 - 4 mm. More preferably, at least 70 % by weight of said granules belong to one or two of the size classes.
- the compaction method of the invention gives product granules having a bulk density varying from 0.5 to 1.5 g/cm 3 , preferably from 0.8 to 1.3 g/cm 3 and more preferably from 0.9 to 1.2 g/cm 3 .
- the iron oxyhydroxide mass having a moisture content of 5 - 15 % by weight is preferably produced from an iron oxyhydroxide filter cake by drying.
- Said iron oxyhydroxide mass may be derived from materials based on iron sulphate, iron chloride or iron nitrate.
- said material based on iron sulphate is a ferric sulphate solution obtained as a by-product in the hydronium jarosite production process.
- said iron oxyhydroxide mass having a moisture content of 5 - 15 % by weight is produced by adding a base to a ferric sulphate solution obtained as a by-product in the hydronium jarosite production process to precipitate the iron oxyhydroxide, followed by separation of the precipitated iron oxyhydroxide by filtration, and drying of the filter cake.
- a filter cake may be produced according to the method described in EP 0 997 436.
- Said base may be selected from the group consisting of magnesium oxide, hydroxide, and carbonate, ammonium, sodium hydroxide, and potassium hydroxide.
- the drying of the final product is not necessary due to the low moisture content of the iron oxyhydroxide mass ranging from 5 to 15 % by weight, the moisture content of the final product thus being substantially similar to that of the iron oxyhydroxide mass to be granulated.
- the invention is also directed to an adsorbent material containing iron oxyhydroxide, produced by the process of the invention.
- a granular adsorbent material containing iron oxyhydroxide is provided, the grain size of the granules being between 0.5 and 4 mm, and the bulk density thereof being from 0.8 to 1.5 g/cm 3 .
- the grain size preferably at least 50 % by weight, more preferably at least 70 % by weight of the granules belong to one or two of the following size classes: 0.5 - 1 mm, 1 - 2 mm, and 2 - 4 mm.
- the bulk density of the granules preferably ranges from 0.8 to 1.3 g/cm 3 and more preferably from 0.9 to 1.2 g/cm 3 .
- the granules are mechanically very resistant.
- the crushing strength of the granules is preferably at least 2 N.
- the crushing strength thereof is preferably at least 5 N.
- the crushing strength thereof is preferably at least 20 N, more preferably at least 30 N.
- Moisture content of the granules is preferably from 5 to 15 % by weight, more preferably from 7 to 15 % by weight, and even more preferably from 7 to 13 % by weight.
- the invention further relates to the use of the adsorbent material produced according the invention, or the adsorbent material of the invention for removing at least one harmful substance from an aqueous solution thereof.
- the harmful substance to be removed is preferably arsenic, a heavy metal, a non-metal such as selenium, or phosphorus, or another substance like natural organic matter (NOM).
- the adsorbent material is particularly suitable for use to remove arsenic from aqueous arsenic solutions, especially from drinking water.
- the aqueous solution to be treated may be ground water, drinking water, industrial waste water as for instance from electronic or electroplating industries, or an aqueous solution washed by rain or melted snow from polluted areas and/or agricultural areas fertilized with phosphorus.
- the adsorbent material according to the invention may for instance be used in solid layer filters. Such filters (two or more) may be installed in parallel to obtain a maximum flow-through, or they may be connected in series to obtain a maximum purity. It is of course possible to use systems having a single solid layer filter.
- the adsorbent material may also be used in other kinds of treatment processes wherein impure or contaminated solution is purified by passing it through the adsorbent material, or by reacting it with the adsorbent material, followed by separation thereof from the purified solution.
- the adsorbent material according to the present invention may be used in different ways to remove arsenic, heavy metals, phosphorus and/or other harmful substances.
- an embodiment of the invention in applications for removing heavy metals and/or arsenic from contaminated areas such as former industrial sites, landfills or shooting ranges, first the route of travel of the water washed from these sites is determined, followed by addition of the adsorbent material in this route on the basis of the obtained results to pass the water washed from the contaminated soil through the adsorbent material.
- a soil filter or a reactive wall.
- the adsorbent material entraps the heavy metals and/or arsenic, and accordingly, the water reaching ground water, lakes, the sea, or rivers, is free or substantially free from heavy metals and/or arsenic.
- the necessary amount of the adsorbent material is for instance estimated by analyzing soil samples.
- the amount of the adsorbent material needed depends on the desired service life. The service life may e.g. vary between 10 and 50 years.
- the quality of the filtered water may be regularly monitored.
- the exchange of the adsorbent material is implied by quality reductions.
- the above principle may also be applied to phosphorus removal from water washed from fields, or from waste water produced in sparsely populated areas.
- contaminated water or waste water containing heavy metals, arsenic and/or phosphorus washed from contaminated area is passed to a storage tank.
- the contaminated water is passed from this tank to another tank to be contacted with the adsorbent material.
- the mixture is agitated for a suitable time. This is followed by filtration of the mixture, and release of the filtrate free or substantially free of heavy metals, arsenic and/or phosphorus to a lake, the sea, or a river.
- the obtained precipitate containing heavy metals and/or arsenic may be reused, but, however, the removal of this precipitate from the treatment system and replacement thereof with fresh adsorbent material will at some point become necessary.
- FeO(OH) was produced according to EP 0 997 436. After filtering, the moisture content of the FeO(OH) mass was 45 %. The product was dried in a forced air drying chamber to the moisture content of 10 %. Drying temperature was 70 0 C. The drying process was monitored by assaying the water content using Karl Fischer titration.
- a solution of As(V) was prepared from a commercially available arsenic standard produced by Reagecon.
- the concentration of the arsenic standard solution was 1000 mg/l As(V).
- the dried FeO(OH) adsorbs more than 99 % of the arsenic at concentrations > 179 mg/l.
- a disadvantage of the product is the fact that it is completely slurried by water, and thus the separation thereof to obtain pure water is complicated.
- FeO(OH) was produced according to EP O 997 436. After filtering, the moisture content of the FeO(OH) mass was 45 %. The product was dried in a forced air drying chamber to the moisture content of 10 %. Drying temperature was 70 0 C. The drying process was monitored by assaying the water content using Karl Fischer titration.
- the product was granulated.
- the dry granulation was carried out by so-called compacting.
- the mass to be granulated is forced by a screw conveyor between two rotating rolls for compression thereof to give a sheet.
- the sheet is crushed for instance using a hammer crusher, followed by sieving of the crushed granules through a vibration sieve.
- the strength of the product granules may be influenced by the compression force.
- the force is regulated by adjusting the roll nip and the rotation speed of the screw conveyor.
- the grain size of the product is determined by the mesh size of the net on the bottom of the crusher.
- the product to be tested was prepared according to Example 2, with the exception that following crushing, a fraction with a grain size from 1 to 2 mm was sieved from the product.
- the bulk density of this fraction is 1.15 g/cm 3 , the crushing strength being 13 N.
- the arsenic removal capacity of this fraction was tested according to Example 1.
- the product to be tested was prepared according to Example 2, with the exception that following crushing, a fraction with a grain size from 2 to 4 mm was sieved from the product.
- the bulk density of this fraction is 0,98 g/cm 3 , the crushing strength being 43 N.
- the arsenic removal capacity of this fraction was tested according to Example 1.
- aqueous solution containing 1 mg/l of lead as an impurity was prepared.
- the adsorbent material to be tested was prepared according to Example 2, with the exception that following crushing, a fraction with a grain size from 1 to 2 mm was sieved from the product. The ability of this fraction to bind lead was tested according to Example 1. Table V
- the product granulated to a grain size from 1 to 2 mm binds lead.
- the product may be used for treating waste water containing lead.
- Waste water with an analyzed phosphorus content of 4.2 mg/l was provided.
- the adsorbent material to be tested was prepared according to Example 2, with the exception that following crushing, a fraction with a grain size from 1 to 2 mm was sieved from the product. The ability of this fraction to bind phosphorus from waste water was tested according to Example 1. Dr Lange's phosphorus tubes and Cadas 30 spectrophotometer were used for phosphorus analysis.
- the product granulated to a grain size from 1 to 2 mm also binds phosphorus.
- the product may be used for treating waste water containing phosphorus.
- aqueous solution with a copper concentration adjusted to 20 mg/l was prepared.
- the adsorbent material to be tested was prepared according to Example 2, with the exception that following crushing, a fraction with a grain size from 1 to 2 mm was sieved from the product. The ability of this fraction to bind Cu was tested according to Example 1.
- the product granulated to a grain size from 1 to 2 mm also binds copper.
- the product may be used for treating waste water containing copper.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Water Treatment By Sorption (AREA)
- Compounds Of Iron (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2007003511A MX2007003511A (en) | 2004-09-24 | 2005-09-23 | Process for the preparation of an adsorbent material containing iron oxyhydroxide, adsorbent material and the use thereof. |
EP05789082A EP1807196A1 (en) | 2004-09-24 | 2005-09-23 | Process for the preparation of an adsorbent material containing iron oxyhydroxide, adsorbent material and the use thereof |
CA002580739A CA2580739A1 (en) | 2004-09-24 | 2005-09-23 | Process for the preparation of an adsorbent material containing iron oxyhydroxide, adsorbent material and the use thereof |
US11/575,911 US20080257823A1 (en) | 2004-09-24 | 2005-09-23 | Process for the Preparation of an Adsorbent Material Containing Iron Oxyhydroxide, Adsorbent Material and the Use Thereof |
BRPI0516014-6A BRPI0516014A (en) | 2004-09-24 | 2005-09-23 | process for the preparation of an adsorbent material containing iron oxyhydroxide, adsorbent material, and use thereof |
NO20071648A NO20071648L (en) | 2004-09-24 | 2007-03-29 | Process for the preparation of an adsorbent containing iron oxide hydroxide, absorbent material and its use. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20041235 | 2004-09-24 | ||
FI20041235A FI118177B (en) | 2004-09-24 | 2004-09-24 | A process for the preparation of iron oxide hydroxide-containing adsorbent material, adsorbent material and use thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006032727A1 true WO2006032727A1 (en) | 2006-03-30 |
Family
ID=33041568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2005/000403 WO2006032727A1 (en) | 2004-09-24 | 2005-09-23 | Process for the preparation of an adsorbent material containing iron oxyhydroxide, adsorbent material and the use thereof |
Country Status (8)
Country | Link |
---|---|
US (1) | US20080257823A1 (en) |
EP (1) | EP1807196A1 (en) |
BR (1) | BRPI0516014A (en) |
CA (1) | CA2580739A1 (en) |
FI (1) | FI118177B (en) |
MX (1) | MX2007003511A (en) |
NO (1) | NO20071648L (en) |
WO (1) | WO2006032727A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009063456A1 (en) * | 2007-11-12 | 2009-05-22 | Technion Research And Development Foundation Ltd | Method for adsorption of phosphate contaminants from water solutions and its recovery |
WO2011016038A1 (en) | 2009-08-05 | 2011-02-10 | Technion Research And Development Foundation Ltd | Method for removal of selenium contaminants from aqueous fluids |
US10105318B2 (en) | 2013-05-20 | 2018-10-23 | Institute Of Strength Physics And Materials Science Of Siberian Branch Russian Academy Of Sciences (Ispms Sb Ras) | Low-dimensional structures of organic and/or inorganic substances and use thereof |
CN111433013A (en) * | 2017-06-29 | 2020-07-17 | 索理思科技开曼公司 | Water stable granules and tablets |
Families Citing this family (5)
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US9068695B2 (en) * | 2012-06-12 | 2015-06-30 | Smrt Delivery Llc | Active guidance of fluid agents using magnetorheological antibubbles |
WO2014063232A1 (en) | 2012-10-26 | 2014-05-01 | Centre De Recherche Industrielle Du Quebec | System and method for treating waste water by means of passive phosphorus capture |
CN106457202B (en) * | 2014-03-14 | 2019-11-26 | 塔塔咨询服务公司 | A kind of technique and equipment for Water warfare |
JP6279539B2 (en) * | 2015-12-10 | 2018-02-14 | 株式会社荏原製作所 | Method for treating radioactive liquid waste containing radioactive cesium and radioactive strontium |
CN112371089A (en) * | 2020-11-16 | 2021-02-19 | 桂林理工大学 | Irregular hexahedron colloidal particle and preparation method and application thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0997436A1 (en) * | 1998-10-30 | 2000-05-03 | Kemira Chemicals Oy | Process for preparing usable products from an impure ferric sulfate solution |
US20020070172A1 (en) * | 2000-09-26 | 2002-06-13 | Andreas Schlegel | Contact and adsorbent granules |
US20050247636A1 (en) * | 2004-04-03 | 2005-11-10 | Andreas Schlegel | Stable adsorber granules |
-
2004
- 2004-09-24 FI FI20041235A patent/FI118177B/en not_active IP Right Cessation
-
2005
- 2005-09-23 US US11/575,911 patent/US20080257823A1/en not_active Abandoned
- 2005-09-23 MX MX2007003511A patent/MX2007003511A/en active IP Right Grant
- 2005-09-23 EP EP05789082A patent/EP1807196A1/en not_active Withdrawn
- 2005-09-23 BR BRPI0516014-6A patent/BRPI0516014A/en not_active IP Right Cessation
- 2005-09-23 WO PCT/FI2005/000403 patent/WO2006032727A1/en active Application Filing
- 2005-09-23 CA CA002580739A patent/CA2580739A1/en not_active Abandoned
-
2007
- 2007-03-29 NO NO20071648A patent/NO20071648L/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0997436A1 (en) * | 1998-10-30 | 2000-05-03 | Kemira Chemicals Oy | Process for preparing usable products from an impure ferric sulfate solution |
US20020070172A1 (en) * | 2000-09-26 | 2002-06-13 | Andreas Schlegel | Contact and adsorbent granules |
US20050247636A1 (en) * | 2004-04-03 | 2005-11-10 | Andreas Schlegel | Stable adsorber granules |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009063456A1 (en) * | 2007-11-12 | 2009-05-22 | Technion Research And Development Foundation Ltd | Method for adsorption of phosphate contaminants from water solutions and its recovery |
WO2011016038A1 (en) | 2009-08-05 | 2011-02-10 | Technion Research And Development Foundation Ltd | Method for removal of selenium contaminants from aqueous fluids |
US10105318B2 (en) | 2013-05-20 | 2018-10-23 | Institute Of Strength Physics And Materials Science Of Siberian Branch Russian Academy Of Sciences (Ispms Sb Ras) | Low-dimensional structures of organic and/or inorganic substances and use thereof |
CN111433013A (en) * | 2017-06-29 | 2020-07-17 | 索理思科技开曼公司 | Water stable granules and tablets |
EP3645258A4 (en) * | 2017-06-29 | 2021-03-31 | Solenis Technologies Cayman, L.P. | Water stable granules and tablets |
Also Published As
Publication number | Publication date |
---|---|
BRPI0516014A (en) | 2008-08-19 |
EP1807196A1 (en) | 2007-07-18 |
MX2007003511A (en) | 2007-06-11 |
CA2580739A1 (en) | 2006-03-30 |
FI118177B (en) | 2007-08-15 |
NO20071648L (en) | 2007-06-20 |
FI20041235A (en) | 2006-03-25 |
FI20041235A0 (en) | 2004-09-24 |
US20080257823A1 (en) | 2008-10-23 |
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