RU2376069C2 - Dressing module - Google Patents

Dressing module Download PDF

Info

Publication number
RU2376069C2
RU2376069C2 RU2008105004A RU2008105004A RU2376069C2 RU 2376069 C2 RU2376069 C2 RU 2376069C2 RU 2008105004 A RU2008105004 A RU 2008105004A RU 2008105004 A RU2008105004 A RU 2008105004A RU 2376069 C2 RU2376069 C2 RU 2376069C2
Authority
RU
Russia
Prior art keywords
pump
flotation
chamber
communicated
sump
Prior art date
Application number
RU2008105004A
Other languages
Russian (ru)
Other versions
RU2008105004A (en
Inventor
Станислав Георгиевич Чебурашкин (RU)
Станислав Георгиевич Чебурашкин
Original Assignee
Общество с ограниченной ответственностью "Нординвэс"
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 Общество с ограниченной ответственностью "Нординвэс" filed Critical Общество с ограниченной ответственностью "Нординвэс"
Priority to RU2008105004A priority Critical patent/RU2376069C2/en
Publication of RU2008105004A publication Critical patent/RU2008105004A/en
Application granted granted Critical
Publication of RU2376069C2 publication Critical patent/RU2376069C2/en

Links

Images

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/52Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly

Abstract

FIELD: mining. ^ SUBSTANCE: invention refers to mineral resource industry and may be used for extraction of valuable elements from ore minerals and products of their processing, for extraction of sulphides of copper, nickel, iron and precious metals from old tails of preserved tailing dump. Dressing module includes open-pit field, dredger, fixed screen, five-jet pulp-divider connected to vibrating screen with size of sieve meshes 1.5 mm, pumps for direction of minus material of vibrating screen to banks of hydraulic cyclones, pump installed at sands output from hydraulic cyclone and connected to five-jet pulp-divider and then with centrifugal separators, chamber flotation machines in process of rougher flotation of centrifugal separators tails and in process of aftertreatment. It is provided with one or two additional dredgers, onshore pumping plant with vibrating screen installed in it with size of sieve meshes 12 mm, dib-hole with overflow pocket connected by means of gravity hydraulic transport to open-pit field for tails wash-out, additional five-jet pulp-divider connected to additional vibrating screens with size of sieve meshes 1.5 mm and dib-holes for reception of minus material of mentioned vibrating screens and direction to banks of hydraulic cyclones by pumps, conditioning tanks one of which is connected by its inlet by means of gravity hydraulic transport to centrifugal separators and by its outlet with dib-hole and pump with controlled capacity - to chamber flotation machine of rougher flotation designed mechanical and consisting of 5 chambers 130 m3 each, powered in sequence, which concentrate yield is connected, by means of dib-hole and pump with controlled capacity, to other conditioning tank and then to chamber flotation machine of first aftertreatment procedure designed mechanical-air and consisting of 4 chambers 17 m3 each, powered in sequence, which concentrate yield is connected to dib-hole and pump with controlled capacity and then to chamber flotation machine of second aftertreatment procedure designed mechanical-air and consisting of 3 chambers 8 m3 each, powered in sequence, which concentrate yield and concentrate yield of centrifugal separators are connected by dib-hole-mixer to high-pressure pump, at that yield of tails of second aftertreatment is connected by means of gravity hydraulic transport to first chamber of first aftertreatment and yield of tails of first aftertreatment is connected by dib-hole and pump to first chamber of mechanical flotation machine of rougher flotation. ^ EFFECT: enhancement of yield and quality of concentrates and reduction of loss of valuable elements in flotation tails. ^ 1 dwg

Description

The invention relates to the mining industry and can be used to extract valuable elements from ores and products of their processing, in particular for the extraction of sulfides of copper, nickel, iron and noble metals from the stale tailings of a preserved tailings.
A known enrichment module for the processing of gold-bearing ores, in which, during the technological process, pulp conveyors, vibrating screen, sump pump, hydrocyclones, arc screen, centrifugal concentrators, tail lock (RF patent 2211731, class V03B 7/00 are installed) , 9/00, publ. 09/10/2003).
A disadvantage of the known module is the large loss of fine and pulverized gold of flotation size and the lack of technical ability to stabilize the initial supply of centrifugal separators in terms of pulp volume and solid content.
Closest to the claimed technical solution is a module for the enrichment of tailing material, including a dredger, a fixed screen with a mesh hole size of 15 mm, a pullover, vibrating screens with a mesh hole size of 1.5 mm, a two-jet pullover, pumps, two hydrocyclone batteries, a pump, five-jet pulp splitter, concentrators, nine-jet pulp splitter, pneumomechanical flotation machines (Blagodatin Yu.V., Yatsenko A.A., Zakharov B.A., Chegodaev V.D., Alekseeva L.I. Involvement in the processing of new raw materials s sources of non-ferrous and precious metals. Nonferrous metals. 2003 №8-9, p.28-29).
In the known method, the efficiency of the module depends on the stability of the pulp supply, which is determined by many factors, in particular, the continuous operation of the dredger, and when it is moved to the bottom according to the scheme with a rotary-rotary pile course (or by any other scheme), technological stops are required for reloading piles, moving anchors, etc. (Nurok GA Processes and technology of hydromechanization of open cast mining. M., Nedra. 1985, p.181-186), scheduled repair and unforeseen stops due to the ingress of foreign objects into the cut-off device. For these reasons, the pulp volume and the amount of solid are reduced in the power supply of the module. The surface of the stationary screen is clogged with coarse rocky soil, which covers the surface of the tailings to prevent dust removal and wind erosion, which also leads to a decrease in the volume of pulp in the technological process of the module. Non-pressure sumps with a valve system for distributing pulp lead to an uneven distribution of pulp volume over screens, hydrocyclone batteries and centrifugal separators and, as a result, overflow of pulp on screens, pressure loss of pulp at the inlet of preliminary classification hydrocyclone batteries, loss of quantity and quality of centrifugal separator concentrate .
Under these conditions, the parallel feeding of nine pneumomechanical flotation machines with a chamber volume of 16 m 3 does not make it possible to stabilize the pulp level in flotation machines with sufficient reliability, which leads to irreplaceable losses of non-ferrous and noble metals with dump flotation tailings.
From the above it follows that the disadvantages of this method are:
- the hardware design of the module does not allow to stabilize the initial power supply of technological operations in terms of solid content and pulp volume;
- lack of reserve dredgers for short-term preventive and long-term repair work;
- the impossibility of uniform distribution of pulp in the equipment for screening and centrifugal enrichment using pressureless sumps;
- transcendental fluctuations in the level of pulp in the flotation machines lead to irreparable losses of valuable elements.
The objective of the invention is to reduce the irreparable loss of valuable elements with tailings of flotation. The technical result is an increase in the yield and quality of the concentrate due to the stabilization of the power supply of the equipment of the enrichment module in terms of pulp volume and solid quantity.
The solution to this problem is achieved by the fact that the known enrichment module, including a quarry field, a dredger, a fixed screen, a five-jet pulp splitter communicated with a vibrating screen with a mesh hole size of 1.5 mm, pumps for guiding the under-screen product of the vibrating screen into hydrocyclone batteries, a pump installed at the exit of the sand from the hydrocyclone and communicated with the five-jet pulp splitter and further with centrifugal separators, chamber flotation machines in the operation of the main flotation of the tailings of the centrifugal separator The ditch and in the cleaning operations according to the invention are equipped with one or two additional dredgers, a coastal pumping station with a vibrating screen with a mesh size of 12 mm installed on it, a sump with an overflow pocket communicated by gravity hydraulic transport with a quarry field for erosion of the tailings, an additional five-jet pulp splitter communicated with additional vibrating screens with a mesh hole size of 1.5 mm and sumps for receiving the under-sieve product of the indicated vibrating screens and pumping them to the ba arenas of hydrocyclones, contact vats, one of which is connected by gravity to the inlet with centrifugal separators and an outlet with a sump and a pump with adjustable capacity with a main flotation chamber flotation machine, made mechanically and consisting of 5 chambers of 130 m each, fed in series, the concentrate output of which sump and pump with adjustable capacity communicated with another contact tank and then with the chamber flotation machine of the first cleaning operation performed by pneumomechanical one and consisting of 4 chambers of 17 m 3 each, fed in series, the concentrate output of which is communicated with a sump and a pump with adjustable capacity and then with a chamber flotation machine of the second cleaning operation, performed pneumomechanical and consisting of 3 chambers of 8 m 3 each, fed in series the concentrate output of which and the concentrate output of centrifugal separators are communicated through a sump mixer with a high-pressure pump, while the output of the second tailings by gravity transport is communicated with the first chamber the first cleaning, and the tailings of the first cleaning are communicated through the sump and pump with the first chamber of the mechanical flotation machine of the main flotation.
The invention is illustrated in the drawing, which shows a diagram of the hardware design of the enrichment module.
The module includes: career field 1 with three (or at least two) dredgers 2; Onshore pumping station, consisting of a fixed 3 and 4 vibration screens, a sump 5 with an overflow pocket for returning excess pulp to the quarry field and associated flushing of tailings on the working board of the quarry, pumps 6 with adjustable capacity; two pressure five-jet pulp dividers 7, ten vibrating screens 8 with polyurethane grids with 1.5 mm holes, two sumps 9 and four pumps 10 with adjustable capacity; four batteries of dehumidifying hydrocyclones 11 (each battery has 16 hydrocyclones with a diameter of 250 mm, 6 of which can be turned on or off automatically), part of the hydrocyclone discharges returns to sumps 9 when the pulp level in them is below the limit; two sumps 12 and two pumps 13 with adjustable performance in the power supply of centrifugal separators, two pressure five-jet pulp splitter 14, ten centrifugal separators 15; contact tank 16 with a volume of 91 m 3 with an upper discharge pocket, sump 17, pump 18 with adjustable capacity in the main flotation supply, five chambers of a mechanical flotation machine 19 with a volume of 130 m 3 each in the main flotation operation; sump 20 with a pump 21 with adjustable capacity in the feed of the contact tank 22 and four chambers of the pneumomechanical flotation machine 23 with a volume of 17 m 3 each for the first cleaning of the main flotation concentrate; sump 24, pump 25 with adjustable capacity in the feed of the three chambers of the pneumomechanical flotation machine 26 with a volume of 8 m 3 each for the second cleaning of the concentrate; sump 27, pump 28 with adjustable capacity, for feeding the tailings of the first cleaning in the main flotation; sump 29 and high-pressure pump 30 for hydrotransport of the general concentrate.
The concentration module operates as follows.
The initial product of the module is the stagnant tailings of the mothballed tailings from the enrichment of disseminated copper-nickel ores of the Norilsk-1 deposit, which are fed by hydraulic transport from three dredgers 2 from career field 1 in excess quantity by volume of pulp with a solid content of 10-20% to fixed 3 and vibrating 4 screens with a mesh size of 12 mm. Oversize product larger than 12 mm (coarse rocky soil and metallurgical slag) is sent for construction purposes. The sub-sieve product enters the sump 5, which is located under the screens and pumps 6 with adjustable capacity, in the quantity specified by the operator by volume of the pulp is fed into the technological process of the module. An excess amount of pulp volume through the overflow pocket of the sump 5 by gravity hydrotransport arrives on the working side of the quarry 1 for washing out the tailings. Thus, stabilization of the pulp volume for subsequent technological operations is achieved. Further, the pulp is fed by two pumps to two pressure five-jet pulp dividers 7, on the outlet pipes of which, for each screen 8, slide valves are installed in a wear-resistant design with remote pneumatic control to connect or exclude each screen from the circuit 8. The under-screen product of screens 8 enters the sumps 9 where the pulp level is kept constant by changing the number of revolutions of the pump motors using ultrasonic level sensors. When the number of revolutions changes, the volume of pulp entering the hydrocyclone batteries decreases or increases, respectively, the pressure at the inlet to the hydrocyclones increases or decreases, therefore, to maintain the pressure at the inlet of the hydrocyclones in the optimal mode, the number of working hydrocyclones is automatically added or reduced. With increasing or decreasing pressure by 0.02 MPa, the gate on the supply pipe of one hydrocyclone automatically opens or closes. When the pulp level drops below the limit in the sumps 9 of the pump 10, the slide valves on the pipelines returning part of the hydrocyclone discharge to the sumps 9 automatically open. Constant pressure at the inlet stabilizes the solid content in the sands of hydrocyclones, while fluctuations in the solid content in the sands do not go beyond the technological mode centrifugal and flotation concentration cards. Sands of hydrocyclones through sumps 12, in which a constant level is maintained with the help of ultrasonic level sensors and changes in the number of revolutions of the electric motors of the pumps 13, are sent to two pressure five-jet pulp splitter 14, on the outlet pipes of which are installed gate valves in a wear-resistant design with automatic control from an industrial logic controller, designed to control the operation of all five centrifugal separators, powered from one five-jet pressure pulp splitter. The concentrate of centrifugal separators is sent to sump 29 for further hydrotransport. The tails of centrifugal separators by gravity transport are sent to a contact tank 16, having a volume of 91 m 3 , which smooths out short-term fluctuations in the volume of the pulp and its solid content when water is supplied to the bowls of centrifugal separators for liquefying and rinsing the concentrate.
From the contact tank, the pulp is sent to the sump 17 of the pump 18. The sump 17 maintains a constant pulp level by changing the number of revolutions of the pump 18. Then, the pulp with a stable volume and solid content is sent to a mechanical flotation machine 19, which consists of five chambers of 130 m 3 each and fed sequentially. The pulp level in the chambers of the flotation machine is maintained constant at a given level, using float sensors installed in each chamber. The large total volume of the chambers of the flotation machine smooths out possible minor changes in the volume of the pulp due to the entry of the tailings of the flotation machine 23 (the first purification of the concentrate) into the first chamber and ensures a stable foam removal of the concentrate. Tails of the flotation machine 19 by gravity transport are sent to the existing tailing dump. The concentrate of the flotation machine 19 is sent to the sump 20, in which the pulp level is kept constant by means of an ultrasonic sensor by changing the number of revolutions of the pump motor 21, which directs the concentrate to the contact tank 22 with a capacity of 9 m 3 with the upper discharge chute.
Contact tank 22 is designed to smooth out possible fluctuations in the volume of pulp in front of the flotation machine 23 (first purification of the concentrate) due to the supply of water to the foam troughs of the flotation machine 19. From the contact tank 22 by gravity hydrotransport, the concentrate enters the pneumomechanical flotation machine 23, which consists of four chambers of 17 m 3 and included in the circuit sequentially. The pulp level in the chambers is kept constant at a given level by means of float sensors installed one for each two chambers. The tailings of the flotation machine 23 are combined with the initial power supply of the flotation machine 19 through a sump 27, in which a constant level is maintained by means of an ultrasonic sensor by changing the number of revolutions of the pump motor 28. The concentrate of the flotation machine 23 (after the first cleaning) through the sump 24, in which the pulp level is also kept constant with using an ultrasonic sensor by changing the number of revolutions of the electric motor of the pump 25, sent to the pneumomechanical flotation machine 26, consisting of three chambers of 8 m 3 each and is powered ny sequentially. The pulp level is maintained constant in all three chambers at a given level using a single float sensor. After the second cleaning, the concentrate enters the sump mixer 29, where the ultrasonic sensor maintains a constant level by adding circulating water and changing the number of revolutions of the pump motor 30. The centrifugal separator concentrate is also sent to the sump 29, and the combined module concentrate is pumped to the system by pump 30 hydrotransport of selective concentrates obtained from ore raw materials.
The inventive module was tested during the processing of stale tails from the processing of normally disseminated copper-nickel ores of the Norilsk-1 deposit, additional products and profit from its sale were obtained.

Claims (1)

  1. An enrichment module, including a quarry field, dredger, fixed screen, five-jet pulp splitter communicated with a vibrating screen with a mesh hole size of 1.5 mm, pumps for guiding the under-screen product of a vibrating screen into hydrocyclone batteries, a pump installed at the exit of sand from a hydrocyclone and communicated with a five-jet pulp splitter and further with centrifugal separators, chamber flotation machines in the operation of the main flotation of the tailings of centrifugal separators and in the cleaning operation, characterized in that equipped with one or two additional dredgers, a coastal pumping station with a vibrating screen with a mesh size of 12 mm installed on it, a sump with an overflow pocket communicated by gravity hydraulic transport with a career field for erosion of tails, an additional five-jet pulp splitter communicated with additional vibrating screens with a screen 1.5 mm and sumps for receiving the under-sieve product of the indicated vibrating screens and forcing the pumps into hydrocyclone batteries, contact tanks, one of the cat ryh inlet communicated gravity hydrotransport centrifugal separators and an outlet with a sump and a pump with an adjustable output from chamber flotation primary flotation formed mechanical and consisting of 5 chambers of 130 m3 each, energized sequentially concentrate outlet which through the sump and the pump with adjustable capacity reported with another contact tank and further with a chamber flotation machine of the first cleaning operation, performed pneumomechanical and consisting of 4 chambers of 17 m 3 each, powered sequentially, the concentrate output of which is communicated with a sump and a pump with adjustable capacity and then with a chamber flotation machine of the second cleaning operation, performed pneumomechanical and consisting of 3 chambers
    8 m 3 each, fed sequentially, whose concentrate output and centrifugal separator concentrate output are communicated through a sump mixer with a high-pressure pump, while the output of the second treatment tailings by gravity transport is communicated with the first first cleaning chamber, and the output of the first cleaning tailings is communicated through the sump and pump with the first chamber of the mechanical flotation machine of the main flotation.
RU2008105004A 2008-02-11 2008-02-11 Dressing module RU2376069C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2008105004A RU2376069C2 (en) 2008-02-11 2008-02-11 Dressing module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2008105004A RU2376069C2 (en) 2008-02-11 2008-02-11 Dressing module

Publications (2)

Publication Number Publication Date
RU2008105004A RU2008105004A (en) 2009-08-20
RU2376069C2 true RU2376069C2 (en) 2009-12-20

Family

ID=41150603

Family Applications (1)

Application Number Title Priority Date Filing Date
RU2008105004A RU2376069C2 (en) 2008-02-11 2008-02-11 Dressing module

Country Status (1)

Country Link
RU (1) RU2376069C2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2448862C1 (en) * 2010-10-29 2012-04-27 Николай Григорьевич Титов Device to clean tail storage mud of metals at bedding
CN102600964A (en) * 2012-03-15 2012-07-25 江西稀有金属钨业控股集团有限公司 Method and system for recovering tailing resources
CN103495492A (en) * 2013-10-11 2014-01-08 金川集团股份有限公司 Beneficiation method for copper nickel
RU2504437C2 (en) * 2011-09-05 2014-01-20 Станислав Георгиевич Чебурашкин Dressing module for combined processing of permafrost tailings from dressing of impregnation copper-nickel ores of norilsk deposits
RU2530945C2 (en) * 2012-06-13 2014-10-20 Станислав Георгиевич Чебурашкин Method of three-stage technological parameters optimisation of centrifugal enrichment for recovery of precious metals in mineral form from ores, tailings from processing of embedded copper-nickel ores of norilsk deposits
RU2583795C2 (en) * 2014-04-01 2016-05-10 Рафис Хамитович Шингараев Floating complex for underwater soil processing
CN106622636A (en) * 2016-12-21 2017-05-10 广西睿桂涵农业有限公司 Beneficiation process of copper-nickel sulfide ore
CN106944244A (en) * 2017-03-09 2017-07-14 昆明理工大学 A kind of method that coated complex copper oxide ore is recycled

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103464274B (en) * 2013-09-09 2015-07-01 金东纸业(江苏)股份有限公司 Ore screening system and technology

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
БЛАГОДАТИН Ю.В. и др. "Вовлечение в переработку новых сырьевых источников цветных и благородных металлов", Цветные металлы №8-9, 2003, с.24-30. *
Справочник по обогащению руд. Обогатительные фабрики. /Под ред. О.С. БОГДАНОВА. - М.: "Недра", 1984, с.52-69. *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2448862C1 (en) * 2010-10-29 2012-04-27 Николай Григорьевич Титов Device to clean tail storage mud of metals at bedding
RU2504437C2 (en) * 2011-09-05 2014-01-20 Станислав Георгиевич Чебурашкин Dressing module for combined processing of permafrost tailings from dressing of impregnation copper-nickel ores of norilsk deposits
CN102600964A (en) * 2012-03-15 2012-07-25 江西稀有金属钨业控股集团有限公司 Method and system for recovering tailing resources
RU2530945C2 (en) * 2012-06-13 2014-10-20 Станислав Георгиевич Чебурашкин Method of three-stage technological parameters optimisation of centrifugal enrichment for recovery of precious metals in mineral form from ores, tailings from processing of embedded copper-nickel ores of norilsk deposits
CN103495492A (en) * 2013-10-11 2014-01-08 金川集团股份有限公司 Beneficiation method for copper nickel
RU2583795C2 (en) * 2014-04-01 2016-05-10 Рафис Хамитович Шингараев Floating complex for underwater soil processing
CN106622636A (en) * 2016-12-21 2017-05-10 广西睿桂涵农业有限公司 Beneficiation process of copper-nickel sulfide ore
CN106622636B (en) * 2016-12-21 2019-05-14 广西睿桂涵农业有限公司 A kind of ore-dressing technique of copper nickel sulfide mineral
CN106944244A (en) * 2017-03-09 2017-07-14 昆明理工大学 A kind of method that coated complex copper oxide ore is recycled
CN106944244B (en) * 2017-03-09 2018-01-12 昆明理工大学 A kind of method that coated complex copper oxide ore recycles

Also Published As

Publication number Publication date
RU2008105004A (en) 2009-08-20

Similar Documents

Publication Publication Date Title
CN101502819B (en) Pre-selection method of low-ore grade magnetic iron ore
CN102773142B (en) Anshan type lean magnetite underground ore dressing and filling method
EP2188116B1 (en) Sand dewatering device and method
CN101716552B (en) Raw coal washing process capable of realizing non-polar ash conditioning
CN101385992B (en) Dry dressing method for separating iron from iron ore
CN103962214A (en) Combined beneficiation method and combined beneficiation system for comprehensive recovery of associated iron-phosphate minerals
Richards A Text book of ore dressing
CN102716814B (en) Novel flotation column serial connection test system for improving flotation granularity upper limit
CN103464275B (en) Beneficiation method and device for quartz vein type gold deposit
CN101469614B (en) Filling apparatus
Gill Materials beneficiation
CN102430481B (en) Sorting process for high-ash and difficult-separation coal slime
US10124346B2 (en) Process for recovering value metals from ore
CN103736569B (en) A kind of beneficiation method of sulphide ore
AU2010214045B2 (en) Hindered-settling fluid classifier
US7909169B1 (en) Methods and systems for recovering alluvial gold
CN101899338B (en) Coal-water slurry slurrying system and method for coal chemical industry
EA017605B1 (en) Modular ore processor
AU2014334524A1 (en) A method of comprehensively recycling gold flotation tailings and the equipments
CN102029222B (en) Grinding technology for processing copper-smelted slag and system thereof
CN103394404B (en) A kind of classifier for milling ore
CN105057089A (en) Beneficiation technology for rock-type primary ilmenite
CN101402064B (en) Beneficiation method and apparatus for fine granule attractive mineral
RU2388544C1 (en) Procedure for production of collective concentrate out of mixed fine ingrained iron ore
AU2005203753A1 (en) A recovery method for nickel sulfide and copper mining tailings

Legal Events

Date Code Title Description
MM4A The patent is invalid due to non-payment of fees

Effective date: 20120212

NF4A Reinstatement of patent

Effective date: 20130727