Patents by Inventor Dirk Van Mechelen
Dirk Van Mechelen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20220332654Abstract: The method for producing a carbonate bonded, compacted article, which method comprises the steps of providing a particulate, carbonatable material; compacting the particulate material to form a compact; and carbonating said compact. The carbonation of the compact is started and subsequently continued for at least 1 hour with a low partial carbon dioxide pressure in the carbonation gas which is lower than 0.5 bars, after which carbonation of the compact is continued for at least 8 hours with a high partial carbon dioxide pressure in the carbonation gas which is higher than 0.5 bars. By carbonating in two phases with a low and a high partial carbon dioxide pressure, a higher compressive strength of the carbonated compacts can be achieved within a predetermined carbonation time, in particular within a carbonation time of about 24 hours so that every day new compacts can be carbonated.Type: ApplicationFiled: June 26, 2020Publication date: October 20, 2022Applicant: Orbix ProductionsInventors: Dirk Van Mechelen, Peter Van Mierloo, Nick Mayelle
-
Patent number: 10598573Abstract: The carbonate bonded, press-moulded article is produced by press-moulding a particulate, carbonatable material that contains water and by carbonating the obtained compact with carbon dioxide gas. In order to be able to ensure an optimal compressive strength of the article two types of tests are provided. In the first type of test a sample of the particulate material is compressed with an increasing compaction pressure and when water starts to be expelled from the material as from a particular compaction pressure, the press-moulding step is performed with a compaction pressure which is at least 7 MPa smaller than this compaction pressure. In the second type of test different samples of the particulate material are press-moulded with different compaction pressures and, after having released the compaction pressure, the density of the compact is determined.Type: GrantFiled: August 28, 2015Date of Patent: March 24, 2020Assignee: ORBIX SOLUTIONSInventors: Nick Mayelle, Frédérique Bouillot, Dirk Van Mechelen
-
Publication number: 20180171422Abstract: The liquid steel slag (2) is poured in at least four successive layers (6-8), comprising a lowermost layer (6), an uppermost layer (7) and at least two intermediate layers (8), in a reservoir (3) and the layers of liquid steel slag are allowed to solidify. After having applied the uppermost layer (7), the solidified steel slag is cooled down more quickly by means of water. The average temperature of each of the intermediate layers (8) is kept at least until the start of the water cooling step, and this for at least one hour, above a minimum temperature which is equal to or higher than the temperature at which ?-dicalcium silicate is formed. In this way, more crystalline phases different from dicalcium silicates are formed so that the formation of fines by the transition of ? into ?-dicalcium silicates can be considerably reduced. A glassy material and/or a phosphorus containing compound is preferably added to the liquid slag to further reduce the formation of fines.Type: ApplicationFiled: March 27, 2015Publication date: June 21, 2018Applicants: RECOVAL BELGIUM, UNIVERSITÉ LIBRE DE BRUXELLESInventors: Dirk VAN MECHELEN, Frédérique BOUILLOT, Sandhya SHARMA, Marie-Paule DELPLANCKE
-
Publication number: 20170241871Abstract: The carbonate bonded, press-moulded article is produced by press-moulding a particulate, carbonatable material that contains water and by carbonating the obtained compact with carbon dioxide gas. In order to be able to ensure an optimal compressive strength of the article two types of tests are provided. In the first type of test a sample of the particulate material is compressed with an increasing compaction pressure and when water starts to be expelled from the material as from a particular compaction pressure, the press-moulding step is performed with a compaction pressure which is at least 7 MPa smaller than this compaction pressure. In the second type of test different samples of the particulate material are press-moulded with different compaction pressures and, after having released the compaction pressure, the density of the compact is determined.Type: ApplicationFiled: August 28, 2015Publication date: August 24, 2017Applicant: RECOVAL BELGIUMInventors: Nick MAYELLE, Frédérique BOUILLOT, Dirk VAN MECHELEN
-
Patent number: 9663362Abstract: The present invention relates to method for recycling alkaline waste water from a stainless steel slag treatment process wherein stainless steel slag is brought into contact with water thereby producing said waste water, which waste water contains heavy metals, including at least chromium, and has a pH of at least 12. The waste water is recycled by using it for treating an alkaline granular carbonatable material, which contains aluminum metal, in order to oxidize the aluminum metal contained therein. This material is in particular municipal waste incinerator bottom ash which can, after the treatment of the present invention, safely be used as fine or coarse aggregate in bonded applications such as concrete, mortar and asphalt. During the treatment with the alkaline waste water, hydrogen gas is produced which is captured and used to produce energy by means of a cogeneration device.Type: GrantFiled: October 22, 2012Date of Patent: May 30, 2017Assignee: RECMIX BELGIUMInventors: Dirk Van Mechelen, Mieke Quaghebeur, Peter Nielsen
-
Patent number: 8882906Abstract: The present invention relates to a method for recycling waste water from a stainless steel slag treatment process wherein stainless steel slag is brought into contact with water, in particular to neutralize the free lime contained therein, thereby producing said waste water. This waste water contains heavy metals, including at least chromium, and has a pH higher than or equal to 11. In accordance with the invention, it is used as production water for manufacturing mortar and/or concrete. In this way, the heavy metals, which are dissolved in the waste water and thus readily available, become bound in the newly formed cement phases so that they are prevented from leaching. Moreover, it has been found that the workability of the fresh mortar or concrete and also the quality of the final mortar or concrete materials is not negatively affected by the use of this alkaline waste water and that an accelerated setting could be achieved during the first hours.Type: GrantFiled: July 18, 2011Date of Patent: November 11, 2014Assignee: Recoval BelgiumInventors: Dirk Van Mechelen, Isabelle Lecomie, Evelyne Nguyen
-
Publication number: 20140291252Abstract: The present invention relates to a method for purifying highly alkaline waste water from a stainless steel slag treatment process. This waste water contains between 0.5 and 5 mg/l of trivalent chromium (Cr(III)) and between 0.5 and 1.0 mg/l of molybdenum. To reduce the chromium and molybdenum content a trivalent iron is added to the waste water in the form of a water soluble ferric salt and the trivalent iron is allowed to co-precipitate with said chromium and molybdenum by lowering the pH of the waste water. It was found that by performing the co-precipitation at a pH of 3.5 to 5.7, both the chromium and the molybdenum content could be effectively reduced to a level of less than 0.5 mg/l, and this without having to provide large amounts of trivalent iron in the waste water, without having to repeat the purification process for several times, without having to add sulphide to the waste water, and without having to lower and raise the pH of the waste water for more than one time.Type: ApplicationFiled: October 27, 2011Publication date: October 2, 2014Inventors: Evelyne Nguyen, Dirk Van Mechelen
-
Publication number: 20140284835Abstract: The present invention relates to a method for producing a bonded article by press-moulding and carbonating a granular, carbonatable material. The granular material is applied in a mould, is press-moulded therein under a compaction pressure of at least 25 MPa, and is carbonated during said press-moulding step by means of a gas which contains at least 1 vol. % of carbon dioxide. By carbonating the material when press-moulding it, high compressive strengths can be achieved in a short period of time.Type: ApplicationFiled: October 26, 2012Publication date: September 25, 2014Applicant: CARBSTONE INNOVATIONInventors: Dirk Van Mechelen, Mieke Quaghebeur, Peter Nielsen
-
Publication number: 20140241979Abstract: The present invention relates to method for recycling alkaline waste water from a stainless steel slag treatment process wherein stainless steel slag is brought into contact with water thereby producing said waste water, which waste water contains heavy metals, including at least chromium, and has a pH of at least 12. The waste water is recycled by using it for treating an alkaline granular carbonatable material, which contains aluminium metal, in order to oxidise the aluminium metal contained therein. This material is in particular municipal waste incinerator bottom ash which can, after the treatment of the present invention, safely be used as fine or coarse aggregate in bonded applications such as concrete, mortar and asphalt. During the treatment with the alkaline waste water, hydrogen gas is produced which is captured and used to produce energy by means of a cogeneration device.Type: ApplicationFiled: October 22, 2012Publication date: August 28, 2014Applicant: RECMIX BELGIUMInventors: Dirk Van Mechelen, Mieke Quaghebeur, Peter Nielsen
-
Patent number: 8628612Abstract: The present invention relates to a process for preparing, starting from a slag material, a filler for construction materials which contain bitumen or a hydraulic binding agent. The slag used to prepare the filler contains ?-dicalcium silicate. The process comprises the step of removing from the slag material a finer fraction formed by particles of a size between 0 and at least 0.75 mm so as to reduce the ?-dicalcium silicate content of the slag material; and the step of finely milling at least a portion of the remaining coarser fraction of the slag to obtain the filler. The invention also relates to the obtained filler, to the use thereof for preparing construction materials and to concrete or mortar compositions and asphalt compositions containing the filler.Type: GrantFiled: June 2, 2008Date of Patent: January 14, 2014Assignee: Recmix BelgiumInventors: Evelyne Nguyên, Dirk Van Mechelen
-
Patent number: 8623134Abstract: The present invention relates to a process for producing a granular material 26 for mixing with at least a hydraulic binding agent and with water to produce mortar or concrete. This process comprises at least an aggregation step and a carbonation step. In the aggregation step, steel slag particles from at least a fine fraction 24 of steel slag, in particular a fine fraction of steel slag containing a significant amount of ?-dicalcium silicate, are aggregated into larger grains so as to form a coarser granular material 25. In the carbonation step, said aggregated particles in said coarser granular material 25 are carbonated by means of carbon dioxide so as to produce a carbonated granular material 26. The present invention also relates to a carbonated granular material of aggregated steel slag particles containing a significant amount of ?-dicalcium silicate, in particular at least 3 wt. %, preferably at least 5 wt. % and more preferably at least 7 wt.Type: GrantFiled: January 15, 2009Date of Patent: January 7, 2014Assignee: Recoval BelgiumInventors: Evelyne Nguyên, Dirk Van Mechelen, Philippe Descamps
-
Patent number: 8603419Abstract: The invention concerns a method of treating an alkaline granular carbonatable material which contains aluminium metal and which has in particular a pH of at least 10. The method comprises an oxidation step wherein at least a portion of said aluminium metal is oxidized by contact with moisture. The aluminium should be oxidized to avoid swelling problems when using the granular material as aggregate. In the method according to the invention this oxidation is accelerated by providing at least one oxidizing agent in said moisture, which oxidizing agent has a higher redox potential than the water contained in said moisture. The method further comprises a carbonation step wherein the granular carbonatable material is at least partially carbonated to lower the pH thereof. In this way the formation of ettringite, which may also release aluminium ions which causing further swelling problems, can be avoided in the granular material or any ettringite present therein can be destabilized.Type: GrantFiled: August 23, 2010Date of Patent: December 10, 2013Assignee: Recoval BelgiumInventors: Philippe Descamps, Isabelle Lecomte, Evelyne Nguyen, Dirk Van Mechelen
-
Publication number: 20130206041Abstract: The present invention relates to a method for recycling waste water from a stainless steel slag treatment process wherein stainless steel slag is brought into contact with water, in particular to neutralize the free lime contained therein, thereby producing said waste water. This waste water contains heavy metals, including at least chromium, and has a pH higher than or equal to 11. In accordance with the invention, it is used as production water for manufacturing mortar and/or concrete. In this way, the heavy metals, which are dissolved in the waste water and thus readily available, become bound in the newly formed cement phases so that they are prevented from leaching. Moreover, it has been found that the workability of the fresh mortar or concrete and also the quality of the final mortar or concrete materials is not negatively affected by the use of this alkaline waste water and that an accelerated setting could be achieved during the first hours.Type: ApplicationFiled: July 18, 2011Publication date: August 15, 2013Inventors: Dirk Van Mechelen, Isabelle Lecomie, Evelyne Nguyen
-
Patent number: 8470067Abstract: Process for preparing a foaming slag former for electric furnaces comprising the steps of aggregating solid slag particles into a coarser granular material and carbonating the solid slag particles to form the foaming slag former. The solid slag particles are preferably aggregated before carbonization, so that the carbonates form a solid matrix binding the particles together.Type: GrantFiled: January 15, 2009Date of Patent: June 25, 2013Assignee: Recoval BelgiumInventors: Evelyne Nguyên, Dirk Van Mechelen, Philippe Descamps
-
Publication number: 20120195814Abstract: The invention concerns a method of treating an alkaline granular carbonatable material which contains aluminium metal and which has in particular a pH of at least 10. The method comprises an oxidation step wherein at least a portion of said aluminium metal is oxidised by contact with moisture. The aluminium should be oxidised to avoid swelling problems when using the granular material as aggregate. In the method according to the invention this oxidation is accelerated by providing at least one oxidising agent in said moisture, which oxidising agent has a higher redox potential than the water contained in said moisture. The method further comprises a carbonation step wherein the granular carbonatable material is at least partially carbonated to lower the pH thereof. In this way the formation of ettringite, which may also release aluminium ions which causing further swelling problems, can be avoided in the granular material or any ettringite present therein can be destabilised.Type: ApplicationFiled: August 23, 2010Publication date: August 2, 2012Inventors: Philippe Descamps, Isabelle Lecomte, Evelyne Nguyen, Dirk Van Mechelen
-
Publication number: 20110023659Abstract: The present invention relates to a process for preparing a foaming slag former 40 for electric arc furnaces 1, with at least 20 wt. % of solid slag particles, to the product of this process, and to its use in electric arc furnaces 1. The process of the invention comprises the steps of aggregating solid slag particles into a coarser granular material 33 and carbonating them to produce said slag former 40. In a preferred embodiment, said solid slag particles are aggregated before said carbonation, so that the carbonates form a solid matrix binding the particles together.Type: ApplicationFiled: January 15, 2009Publication date: February 3, 2011Inventors: Evelyne Nguyên, Dirk Van Mechelen, Philippe Descamps
-
Publication number: 20110017101Abstract: The present invention relates to a process for producing a granular material 26 for mixing with at least a hydraulic binding agent and with water to produce mortar or concrete. This process comprises at least an aggregation step and a carbonation step. In the aggregation step, steel slag particles from at least a fine fraction 24 of steel slag, in particular a fine fraction of steel slag containing a significant amount of ?-dicalcium silicate, are aggregated into larger grains so as to form a coarser granular material 25. In the carbonation step, said aggregated particles in said coarser granular material 25 are carbonated by means of carbon dioxide so as to produce a carbonated granular material 26. The present invention also relates to a carbonated granular material of aggregated steel slag particles containing a significant amount of ?-dicalcium silicate, in particular at least 3 wt. %, preferably at least 5 wt. % and more preferably at least 7 wt.Type: ApplicationFiled: January 15, 2009Publication date: January 27, 2011Inventors: Evelyne Nguyên, Dirk Van Mechelen, Philippe Descamps
-
Publication number: 20100170421Abstract: The present invention relates to a process for preparing, starting from a slag material, a filler for construction materials which contain bitumen or a hydraulic binding agent. The slag used to prepare the filler contains ?-dicalcium silicate. The process comprises the step of removing from the slag material a finer fraction formed by particles of a size between 0 and at least 0.75 mm so as to reduce the ?-dicalcium silicate content of the slag material; and the step of finely milling at least a portion of the remaining coarser fraction of the slag to obtain the filler. The invention also relates to the obtained filler, to the use thereof for preparing construction materials and to concrete or mortar compositions and asphalt compositions containing the filler.Type: ApplicationFiled: June 2, 2008Publication date: July 8, 2010Inventors: Evelyne Nguyen, Dirk Van Mechelen