US 11,667,553 B2
Method and system for the treatment of cyanide-containing fluids
Jochen Schumacher, Tübingen (DE)
Assigned to EISENMANN SE, Böblingen (DE)
Appl. No. 16/91,601
Filed by EISENMANN SE, Böblingen (DE)
PCT Filed Apr. 6, 2017, PCT No. PCT/EP2017/058201
§ 371(c)(1), (2) Date Oct. 5, 2018,
PCT Pub. No. WO2017/174702, PCT Pub. Date Oct. 12, 2017.
Claims priority of application No. 10 2016 004 061.0 (DE), filed on Apr. 8, 2016.
Prior Publication US 2019/0084851 A1, Mar. 21, 2019
Int. Cl. C02F 1/72 (2023.01); C02F 1/66 (2023.01); C02F 101/18 (2006.01); C02F 103/10 (2006.01); C02F 103/16 (2006.01); C02F 103/34 (2006.01); C02F 103/36 (2006.01); C02F 103/40 (2006.01)
CPC C02F 1/722 (2013.01) [C02F 1/66 (2013.01); C02F 1/725 (2013.01); C02F 2101/18 (2013.01); C02F 2103/10 (2013.01); C02F 2103/16 (2013.01); C02F 2103/343 (2013.01); C02F 2103/36 (2013.01); C02F 2103/40 (2013.01); C02F 2209/003 (2013.01); C02F 2209/02 (2013.01); C02F 2209/06 (2013.01); C02F 2301/046 (2013.01); C02F 2301/08 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for treating cyanide-containing liquids comprising the steps of:
subjecting cyanide-containing liquid to a pretreatment in a pretreatment zone wherein at least a specified pH using a pH modifier and a specified temperature are established, the pretreatment forming a base liquid;
transferring the base liquid to at least one reaction reactor located downstream from the pretreatment zone;
providing a first amount of an oxidizing agent to the at least one reaction reactor in a controlled manner and admixing the base liquid in the at least one reaction reactor with at least the oxidizing agent, thereby initiating an oxidation reaction of cyanides in the cyanide-containing liquid;
selectively supplying the pH modifier to the at least one reaction reactor independently of any pH modifier supplied to the pretreatment zone;
selectively supplying a catalyst to the at least one reaction reactor;
transferring liquid from the at least one reaction reactor as intermediate liquid into at least one process reactor located downstream from the at least one reaction reactor;
providing a second amount of the oxidizing agent to the at least one process reactor in a controlled manner, the second amount of the oxidizing agent being provided to the at least one process reactor being independent of the first amount of the oxidizing agent provided to the at least one reaction reactor, the at least one process reactor having conditions under which the cyanide oxidation reaction initiated in the at least one reaction reactor is able to proceed, forming a process liquid;
selectively supplying the pH modifier to the at least one process reactor independently of any pH modifier supplied to the pretreatment zone or the at least one reaction reactor;
analyzing a cyanide content of the base liquid, the intermediate liquid treated with the oxidizing agent and removed from the at least one reaction reactor, and the process liquid treated with the oxidizing agent and removed from the at least one process reactor, and selectively adjusting one or more of a pretreatment temperature, the first amount of the oxidizing agent, the second amount of the oxidizing agent, or the catalyst, in response to the cyanide content of the base liquid, the intermediate liquid removed from the at least one reaction reactor and/or the process liquid removed from the at least one process reactor; and
maintaining at least periodically a continuous liquid stream, wherein
the base liquid is transferred continuously from the pretreatment zone into the at least one reaction reactor;
the intermediate liquid is transferred continuously from the at least one reaction reactor into the at least one process reactor; and
the process liquid is withdrawn continuously from the at least one process reactor.