WO2017212398A1 - Dispositif de dosage - Google Patents

Dispositif de dosage Download PDF

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Publication number
WO2017212398A1
WO2017212398A1 PCT/IB2017/053321 IB2017053321W WO2017212398A1 WO 2017212398 A1 WO2017212398 A1 WO 2017212398A1 IB 2017053321 W IB2017053321 W IB 2017053321W WO 2017212398 A1 WO2017212398 A1 WO 2017212398A1
Authority
WO
WIPO (PCT)
Prior art keywords
tank
pump
valve
dosing mechanism
pressure
Prior art date
Application number
PCT/IB2017/053321
Other languages
English (en)
Spanish (es)
Inventor
Diego Andrés ACOSTA MAYA
Carlos Alberto GONZALEZ MEJÍA
Original Assignee
Universidad Eafit
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Universidad Eafit filed Critical Universidad Eafit
Publication of WO2017212398A1 publication Critical patent/WO2017212398A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • C22B11/10—Obtaining noble metals by amalgamating
    • C22B11/12—Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/02—Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B1/00—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B1/00—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values
    • G05B1/01—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to fluid dosing devices, preferably, dosing fluid (s) to other fluid (s).
  • WO2014090260A1 discloses a zinc precipitation circuit comprising a container configured to carry a pregnant solution with dissolved precious metals.
  • the container includes means for supplying zinc particles.
  • the circuit also has a precipitation filter (for solid-solid separations) located downstream of the vessel; and at least one classifier (eg hydrocyclones, vibrating tables) that separates zinc particles from other precipitates from the filtered (clarified) pregnant solution.
  • the classifier is arranged upstream of the precipitation filter and downstream of the vessel.
  • the circuit comprises a recycle stream with supply means (eg wet conveyors, sludge pump pipes, and / or hoppers) configured to deliver the zinc particles that are separated in the classifier to the container.
  • supply means eg wet conveyors, sludge pump pipes, and / or hoppers
  • the document indicates that an objective of the invention is to reduce the overall size of a Merrill-Crowe type operating plant.
  • the document discloses a deaeration column operating under vacuum conditions, the deaerated pregnant solution comes out of the bottom of the deaeration column.
  • a vacuum pump connected above the deaeration tower is shown in Figure 4 of the document, and a tank with clarified pregnant solution connected by a pipe and a pump to the deaeration tower.
  • the document discloses pumps connected by pipeline to the classifier and to a sterile solution tank (liquid fraction leaving the classifier).
  • the document shows a device that in its configuration requires a pump before the deaeration tower to generate a flow to the same tank and a pump between the deaeration tower and the clarification tank to achieve the precipitation of metals. This configuration implies high costs in the maintenance and operation of the plant.
  • the present invention corresponds to a dosing device comprising a tank, a pressure variator, a dosing mechanism and a pump.
  • the tank is connected to a liquid fluid supply through a conduction line.
  • the pressure variator and the tank are connected by a pipe.
  • the tank is connected to an outlet line that has a breakdown that connects to the dosing mechanism.
  • the pump suction is connected to the outlet line downstream of the breakdown.
  • the discharge of the pump is connected to a discharge line that leaves the battery limits of the process and has a return to the dosing mechanism.
  • the pressure in the pump suction and the pressure given by the pressure variator cause a flow from the tank and the dosing mechanism through the pump.
  • FIG.1 corresponds to the dosing device.
  • FIG.2 corresponds to an embodiment of the dosing device where the pressure variator is a vacuum ejector.
  • FIG.3 corresponds to an embodiment of the dosing device where the pressure variator is a barometric leg.
  • FIG.4 corresponds to an embodiment of the dosing device applied to an emulsion polymerization process.
  • the present invention corresponds to a dosing device comprising: a tank (1) with an inlet, an outlet and a connection, the first inlet is connected to a supply of a liquid fluid by a conduction line, not illustrated, and the outlet is connected to an outlet line;
  • a pressure variator (2) connected to the tank connection (1) by means of a pipe;
  • a dosing mechanism (3) with an inlet and outlet the dosing mechanism (3) is loaded with substances and the outlet is connected to a breakdown of the outlet line between the tank (1) and the pump (4) ;
  • the discharge line is connected to the discharge of the pump (4); where the pump (4) and the pressure variator (2) cause a flow of liquid fluid from the tank (1) and the dosing mechanism (3) through the pump (4).
  • the tank (1) receives and stores a liquid fluid at a pressure different from the ambient pressure.
  • Liquid fluid comes from various sources such as tank trucks, other tanks and other sources of liquid fluid. Said liquid fluid requires a subsequent dosing process.
  • the liquid fluid enters the tank (1) through the conduction line.
  • a first valve (5) is arranged to regulate the flow of liquid fluid into the tank (1).
  • Dispersion means are arranged in the conduction line, such as showers, diffusers, perforated pipes and combinations of the above.
  • the pressure of the liquid fluid inside the conduction line is greater than the pressure in the gas phase of the liquid fluid in the tank (1).
  • a pressure variation process hereinafter, conditioning process
  • the tank (1) and the pressure variator (2) are connected by the pipe.
  • the pressure variator (2) conditions the liquid fluid in the tank (1).
  • a second valve (6) is arranged in the pipeline to control the level of the liquid fluid.
  • An outlet line is connected to the tank (1) which is arranged to allow the exit of liquid fluid.
  • the dosing mechanism (3) is loaded with substances required for the liquid fluid process and is connected to a breakdown of the outlet line. In the breakdown of the output line there is a third valve (7) that regulates the level of the dosing mechanism (3).
  • the pump (4) is connected to the output line. In the suction of the pump (4) there is a fourth valve (8) that prevents the flow through the pump (4) when it is not on.
  • the pump (4) is a centrifugal pump that sucks from the tank (1) and the dosing mechanism (3).
  • the discharge of the pump (4) is connected to a discharge line that has a return line to the dosing mechanism (3) to prevent overpressure of the discharge line.
  • a fifth valve (9) is arranged to control the flow of the discharge line to the dosing mechanism (3).
  • the discharge line of the pump (4) also has an exit from the process on which a sixth valve (10) that regulates the liquid fluid level of the tank (1) is arranged. The effect of the pump (4) and the pressure variator (3) causes a flow from the tank (1) and the dosing mechanism (3).
  • the equivalent head of liquid fluid Ah ea given by P dh-liquid gas must be the same in the tank (1) and in the dosing mechanism (3). Said equivalent head of liquid fluid must exceed the net positive suction head (hereinafter NPSH) of the pump (4).
  • NPSH net positive suction head
  • the height of liquid fluid in the dosing mechanism (3) is regulated by the third valve (7).
  • the device has:
  • a pressure transmitter (12) connected to the tank (1) above the liquid fluid level
  • a pressure transmitter (15) connected to the outlet of the sixth valve (10); a flow controller (16) with two inputs and one output, one input connected to the flow transmitter (16), the other input connected to the pressure transmitter (12) and the output connected to the first valve (5);
  • a level control (18) with two inputs and one output, one input connected to the pressure transmitter (12), the other input connected to the level transmitter (13) and the output connected to the sixth valve (10); Y
  • a pressure controller (19) with an inlet and outlet, the inlet connected to the pressure transmitter (15) and the outlet connected to the fifth valve (9).
  • the information taken from the flow transmitter (11) and the information taken from the pressure transmitter (12) are compared through a calculation that indicates to the flow controller (16) the opening level of the first valve (5).
  • the information taken from the pressure transmitter (12) and the information taken from the flow transmitter (13) are compared through a calculation that indicates to the level controller (18) the valve opening level (10) .
  • the pressure controller (17) varies the opening level of the second valve (6) to regulate the level of liquid fluid.
  • the level controller (20) regulates the opening level of the third valve (7) to control the level of substances dosed by the dosing mechanism (3).
  • the pressure controller (19) varies the opening level of the valve (9) to control the flow that is diverted to the dosing mechanism (3) through the return and control the pressure in the discharge line.
  • the first valve (5) is an automatic control valve.
  • the first valve (5) is a manual control valve.
  • the sixth valve (10) is an automatic control valve. In another embodiment not illustrated by the invention, the sixth valve (10) is a manual control valve.
  • homogeneous distribution means of liquid fluid are arranged inside the tank (1), for example, packed beds, perforated plates, stirrers and combinations of the above.
  • the tank (1) is selected from the group consisting of deaeration units, reactors, bioreactors, distillation towers and combinations of the above. Said selection depends on the conditioning process that is selected from the group consisting of deaeration, oxygenation, carbonation, heterogeneous catalysis and submission to an inert atmosphere.
  • the liquid fluid fluid is a pregnant solution composed of cyanide complexed gold between 0.5 and 10% v / v.
  • the liquid fluid is a detergent solution prior to the addition of the saponifying agent.
  • the liquid fluid is a solution of emulsion monomers prior to polymerization.
  • the liquid fluid is a solution that requires deodorization such as oils.
  • the liquid fluid is an aqueous solution prior to carbonation.
  • the liquid fluid is process water that requires treatment.
  • the pressure variator (2) is selected from the group consisting of vacuum ejectors, barometric pump legs and gas supply devices.
  • the pipe connecting the tank (1) with the pressure variator (2) is characterized in that the length to internal diameter ratio is between 1 and 100.
  • the variator Pressure (2) is connected to the tank (1) above the level of liquid fluid and a baffle is arranged between the tank (1) and the pressure variator (2) to prevent the entry of liquid fluid into the pressure variator .
  • the pressure variator (2) is a vacuum ejector.
  • the liquid fluid level of the tank (1) is regulated by a second valve (6) arranged at the inlet of the vacuum ejector.
  • the pipe is connected to the suction section of the vacuum ejector.
  • the dosing mechanism is used in the precipitation of pregnant solution from the Merrill Crowe process.
  • the tank (1) is an absorption tower with a height between 2 and 6m, diameter between 0.25 and 2m with a height / diameter ratio between 3 and 10.
  • the absorption tower has inside a packed bed loaded between the 20% and 60% of the total volume of the tower with means of homogeneous distribution of the liquid phase, for example, pall ring, raschig rings, and cylinders. Said packed bed with a specific length, defined by the relationship between the packing volume and the wet area, between 0.02 meters and 0.10m.
  • a space is disposed from the top of the packing and the top of the absorption tower between 0.5m and lm.
  • the packed bed is located inside the absorption tower at its bottom.
  • the liquid fluid is pregnant solution.
  • Said pregnant solution is entered into the absorption tower through a distribution shower that is located at the top of the absorption tower above the packed bed.
  • the pressure variator (2) is a vacuum ejector that generates a pressure between - 104 and -3 kpa to achieve an oxygen concentration in the pregnant solution of less than 2% w / w.
  • the pregnant solution is entered into the absorption tower through liquid fluid distribution means, such as diffusers to prevent flow grooving.
  • the second valve (6) is a manual control valve.
  • the second valve (6) is an automatic control valve.
  • the pressure variator (2) is a barometric leg caused by a vacuum pump.
  • the pressure of the tank (1) is regulated by the second valve (6) arranged in the suction of the vacuum pump.
  • the pipe is connected to the suction of the vacuum pump.
  • a flow control mechanism is provided in the pump (4), such as a speed variator (20).
  • the pressure variator (2) is a vacuum pump.
  • the pressure of the tank (1) is regulated by a variable speed drive arranged in the vacuum pump.
  • the pipe is connected to the suction of the vacuum pump.
  • the dosing device is used in a polymerization inhibition process in an emulsion polymerization process.
  • the tank (1) is a reactor with a height between 2 and 5m; a diameter between 2 and 10m; and a height / diameter ratio between 1 and 2.
  • the reactor is continuously stirred by means of agitation such as, for example, anchor, vane and propeller stirrers. Said stirring means rotate at a speed between 1 and 200rpm.
  • the pressure variator (2) is a pressurization mechanism such as, for example, a pressurized line that carries an inert gas such as nitrogen and maintains the oxygen concentration of less than 2% v / v.
  • Said pressurized line is connected to the pipe and in the pipe a second valve (6) is arranged to regulate the pressure in the reactor.
  • the pressure inside the reactor is maintained between 101 and 1,010 kpa.
  • the reactor has a temperature control mechanism such as coils through which a hot fluid passes. Said hot fluid is selected to maintain the reactor operating temperature between 30 and 120 ° C.
  • the vapors generated in the polymerization reaction carried out in the reactor pass through a condenser maintaining a reflux rate between 0 and 1 and are returned to the reactor at a temperature between 30 and 120 ° C.
  • a flow control mechanism such as a speed variator (20).
  • the inert gas is any suitable gas that does not adversely affect the polymerization reaction.
  • the tank (1) is a jacket reactor through which hot fluid is passed to heat the tank.
  • the hot fluid is, for example, water, air, steam and any other industrial service that is provided for heating.
  • the pressure variator (2) is a pressurized line that conducts a gas.
  • the pipe is connected to the pressurized line.
  • the pressure of the tank (1) is regulated by a second valve (6) arranged in the pipe.
  • the pressurized line conducts a reactive gas.
  • the pressurized line conducts an inert gas.
  • the pressurized line conducts a gas that is bubbled in the liquid phase of the tank (1).
  • the pressure variator (2) is a gas pump.
  • the pressure of the tank (1) is regulated by means of a speed variator arranged in the gas pump.
  • the pipe is connected to the pump discharge.
  • the pressure variator (2) generates vacuum and does so by any method known in the art.
  • the dosing mechanism (3) is a container that feeds substances at the outlet of the tank (1).
  • the fed substance is a precipitating agent.
  • the fed substance is a saponifying agent.
  • the fed substance is a polymerization inhibitor.
  • the fed substance is a bleaching agent, such as adsorbent clay.
  • the fed substance is a preservative.
  • the fed substance is a solution for oxygen capture.
  • the dosing mechanism (3) comprises a conical section with an angle between 10 and 90 ° measured from a plane perpendicular to the axis of revolution of the section.
  • the dosing mechanism (3) is a pressure vessel.
  • the fifth valve (9) is an automatic control valve.
  • the fifth valve (9) is a manual control valve.
  • the pump (4) is a centrifugal floor pump. In another embodiment of the invention, the pump (4) mixes the liquid fluid and the substances of the dosing mechanism (3).
  • the output of the process goes through filters where polymetallic precipitates are deposited.
  • the output of the process goes to packing tanks where surfactant products are stored.
  • the process exit goes to a packing line where aqueous base adhesives are stored.
  • the process outlet goes to a filter where bleaching agent is retained and the refined oil goes to a tank.
  • the output of the process goes to a carbonated beverage packaging line.
  • the process output goes to a power boiler.
  • the third valve (7) is an automatic control valve.
  • the third valve (7) is a manual control valve.
  • control of the dosing device is carried out through the steps taken by the following process: to. close the flow step between:
  • control process is performed automatically. In another embodiment not illustrated by the invention, it is performed manually.
  • a dosing device was designed and built to perform the gold precipitation process in a Merrill Crowe process.
  • the tank (1) corresponds to a deaeration tower
  • the pressure variator (2) corresponds to a barometric leg generated by a vacuum pump
  • the dosing mechanism (3) is a hopper
  • the pump (4) is a centrifugal floor pump.
  • the tank (1) is connected to a reservoir of pregnant solution through a line of
  • the tank (1) It has a height of 2.5m and is a 40-pipe tube made of carbon steel.
  • the connection between the pregnant solution tank and the tank (1) is 2.4m high. Inside the tank (1) 5 plates are arranged to homogeneously distribute the pregnant solution.
  • the level of pregnant solution is between 80 and 110cm.
  • the tank (1) has a level transmitter (13) that corresponds to a 30cm long viewfinder located between 80 and 110cm high. In the upper part of the tank (1) there is a glycerin pressure gauge to measure the pressure of the gas phase.
  • the pressure variator (2) consists of a single stage vacuum pump with a power of 1/4 Hp that reaches a pressure of -104 kpa.
  • the dosing mechanism (3) is a funnel formed of a cylindrical section 50 centimeters high and 16 "in diameter; and a conical section having a diameter greater than 16" and a diameter less than 3/4 ".
  • Dosing (3) is made of carbon steel and is at ambient pressure. The dosage is carried out by micro drip.
  • the pump (4) is a 1.5 Hp centrifugal pump. All valves are ball and are made of PVC. The return on the discharge line is 3/4 ". The control of all valves is manual.
  • the pregnant and dosed solution arrives at press filters from which samples are taken and reacted with a chromophone to verify that the gold is completely precipitated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)

Abstract

La présente invention concerne un dispositif de dosage comprenant un réservoir, un variateur de pression, un mécanisme de dosage et une pompe. Le réservoir est raccordé à une alimentation en liquide au moyen d'un conduit. Le variateur de pression et le réservoir sont raccordée au moyen d'un tube. Un conduit de sortie présentant un conduit d'évacuation relié au mécanisme de dosage est raccordé au réservoir. Le système d'aspiration de la pompe est raccordé au conduit de sortie en aval du conduit d'évacuation. Le système de purge de la pompe est raccordé à un conduit de purge qui sort des limites de batterie du procédé et qui présente un élément de retour vers le mécanisme de dosage.
PCT/IB2017/053321 2016-06-07 2017-06-06 Dispositif de dosage WO2017212398A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CO16148876 2016-06-07
CO16148876 2016-06-07

Publications (1)

Publication Number Publication Date
WO2017212398A1 true WO2017212398A1 (fr) 2017-12-14

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PCT/IB2017/053321 WO2017212398A1 (fr) 2016-06-07 2017-06-06 Dispositif de dosage

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913730A (en) * 1987-05-15 1990-04-03 Canadian Patents And Development Ltd. Recovery of gold from aqueous solutions
US5250273A (en) * 1990-01-18 1993-10-05 Canadian Liquid Air Ltd - Air Liquide Canada Ltee Hydrometallurgical leaching process and apparatus
US5449397A (en) * 1994-06-24 1995-09-12 Hunter; Robert M. Biocatalyzed leaching of precious metal values
WO2000015856A1 (fr) * 1998-09-16 2000-03-23 Acacia Resources Limited Procede d'extraction d'or
US20020179451A1 (en) * 2001-04-20 2002-12-05 Weldon Todd A. Apparatus and method for recovery of gold and silver from ore
WO2014090260A1 (fr) * 2012-12-13 2014-06-19 Flsmidth A/S Systèmes et procédés de précipitation du zinc pour la récupération efficace de métaux précieux

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913730A (en) * 1987-05-15 1990-04-03 Canadian Patents And Development Ltd. Recovery of gold from aqueous solutions
US5250273A (en) * 1990-01-18 1993-10-05 Canadian Liquid Air Ltd - Air Liquide Canada Ltee Hydrometallurgical leaching process and apparatus
US5449397A (en) * 1994-06-24 1995-09-12 Hunter; Robert M. Biocatalyzed leaching of precious metal values
WO2000015856A1 (fr) * 1998-09-16 2000-03-23 Acacia Resources Limited Procede d'extraction d'or
US20020179451A1 (en) * 2001-04-20 2002-12-05 Weldon Todd A. Apparatus and method for recovery of gold and silver from ore
WO2014090260A1 (fr) * 2012-12-13 2014-06-19 Flsmidth A/S Systèmes et procédés de précipitation du zinc pour la récupération efficace de métaux précieux

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