Abrégé

The present invention relates to a method and an apparatus for simultaneous removal of thiosalts and nitrogen compounds in waste water, wherein the amount of thiosalts in the waste water is larger than the stoichiometric demand for the autotrophic nitrogen removal. The apparatus comprises a bioreactor (1), such as a movin bed reactor with biofilm carriers, having an inlet (3) for receiving the waste water and an outlet (4) for discharging the purified water. The apparatus comprises an oxygen supply device (6) arranged to supply oxygen to the water in the reactor, dissolved oxygen measuring device (12) and a control unit (10) arranged to control the content of dissolved oxygen in the reactor such that the excess of thiosalts is oxidized by the oxygen at the same time as the denitrification process is maintained. The autotrophic denitrification maybe carried out by a culture containing a psychrophilic and/or psychrotolerant Thiobacillius Denitrificans strain.

Classes IPC  ?

• C02F 3/34 - Traitement biologique de l'eau, des eaux résiduaires ou des eaux d'égout caractérisé par les micro-organismes utilisés
• C02F 3/28 - Procédés de digestion anaérobies
• C02F 3/00 - Traitement biologique de l'eau, des eaux résiduaires ou des eaux d'égout

Abrégé

The present disclosure relates to a process for recovering a valuable metal from a sulfidic material. The process comprises subjecting the sulfidic material to a hydrometallugical step followed by selective removal of elemental sulful from the metallurgical residue before a final metal recovery step, such as cyanide leaching. The process improves the over-all process economy and reduces the cyanide consumption as a result of the selective removal of elemental sulfur.

Classes IPC  ?

• C22B 3/18 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés à l'aide de micro-organismes ou d'enzymes, p. ex. de bactéries ou d'algues
• C22B 3/04 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation

Abrégé

The disclosure relates to a process for refining of copper bullion comprising arsenic and/or antimony in order to enable extraction of the metal values bound in the copper bullion. The process comprises two separate metallurgical process steps wherein the first step comprises selective conversion of elements having high affinity to arsenic and antimony and the second step comprises oxidation of arsenic and/or antimony to a lead oxide based slag.

Classes IPC  ?

• C22B 15/14 - Affinage
• C22B 1/11 - Élimination du soufre, du phosphore ou de l'arsenic autrement que par grillage

Abrégé

The disclosure relates to a process for refining of copper bullion comprising arsenic and/or antimony in order to enable extraction of the metal values bound in the copper bullion. The process comprises two separate metallurgical process steps wherein the first step comprises selective conversion of elements having high affinity to arsenic and antimony and the second step comprises oxidation of arsenic and/or antimony to a lead oxide based slag.

Classes IPC  ?

• C22B 15/14 - Affinage
• C22B 1/11 - Élimination du soufre, du phosphore ou de l'arsenic autrement que par grillage

Abrégé

The invention relates to a method for a continuous bioleaching of a metal containing sulphidic materials. Such a material in the form of a pulp or slurry is fed to a main circuit, where a bioleaching is performed in one or more stages with a culture of microorganisms which is suitable as regards the ingoing materials. A material having the ability to promote growth of microorganisms suitable for the bioleaching in the main circuit is fed to a side circuit for the generation of such microorganism. The content from the side circuit is fed to the main circuit in a predetermined flow so that an activity high enough is obtained in the culture in this circuit also at staying times shorter than the critical as should prevail without such an addition. The leaching in the main circuit is, thus, allowed to be controlled of the oxidation degree and temperature, so that a selective oxidation of different ingoing materials is allowed as well as the achievement of a predetermined oxidation ratio of the outgoing material from the main circuit. A separated leaching residue from this material is withdrawn having an oxidation ratio suitable for a following metal winning process.

Classes IPC  ?

• C22B 3/18 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés à l'aide de micro-organismes ou d'enzymes, p. ex. de bactéries ou d'algues

Abrégé

A process for batchwise working-up valuable metals containing recycling materials having a content of organic constituents so high that its use as smelting materials in conventional metal smelting processes is not suitably or even possible. The material is charged to a tiltable reactor rotatable along its own longitudinal axis having a common opening for charging and emptying. The material is heated to a temperature promoting the expulsion of organic constituents by pyrolysis and/or combustion. The material consists at least to an essential part of such size fractions that admits a continuous charging during operation. The process is characterized in that said material during operation is charged continuously in an adjustable stream being controlled and/or adjusted by means of running measurements of different process variables so that the flow and composition of the combustible gas and the heat release is kept under control. A worked-up product substantially free from any organic substance is withdrawn from the reactor and is added to a conventional metal smelting process. The material is suitably supplied during operation by means of a charging equipment provided against or down through the single opening of the reactor by means of gravity and/or a pneumatic transport gas.

Classes IPC  ?

• C21C 1/04 - Élimination des impuretés autres que le carbone, le phosphore ou le soufre
• C21C 5/30 - Réglage et commande du soufflage

Abrégé

A process for batchwise working-up valuable metals containing recycling materials having a content of organic constituents so high that its use as smelting materials in conventional metal smelting processes is not suitably or even possible. The material is charged to a tiltable reactor rotatable along its own longitudinal axis having a common opening for charging and emptying. The material is heated to a temperature promoting the expulsion of organic constituents by pyrolysis and/or combustion. The material consists at least to a substantial part of such size fractions that admits a continuous charging during operation. In the process, said material during operation is charged continuously in an adjustable stream being controlled and/or adjusted by means of running measurements of different process variables so that the flow and composition of the combustible gas and the heat release is kept under control. A worked-up product substantially free from any organic substance is withdrawn from the reactor and is added to a conventional metal smelting process. The material is suitably supplied during operation by means of a charging equipment provided against or down through the single opening of the reactor by means of gravity and/or a pneumatic transport gas.

Classes IPC  ?

• C22B 1/02 - Procédés de grillage