GRUJIC, Milorad (Nikole Tesle 20/35, Majdanpek, 19250, RS)
VRHOVSEK, Miroslav (Borisavljeviceva 76, Beograd, 11000, RS)
BARBULOVIC, Igor (Saska 7/25, Majdanpek, 19250, RS)
GRUJIC, Milorad (Nikole Tesle 20/35, Majdanpek, 19250, RS)
VRHOVSEK, Miroslav (Borisavljeviceva 76, Beograd, 11000, RS)
BARBULOVIC, Igor (Saska 7/25, Majdanpek, 19250, RS)
| PATENT REQUIREMENTS 1. The process for extracting molybdenum from the collective concentrate CuMo, marked by three stages: adding SYNTEX-L reagent (0,2 g/t) and D2 (2g/t) in the process of basic flotation of copper minerals in order to improve the exploitation of Mo for 20%, condensation of the collective concentrate Cu-Mo, and the overflow of the condenser, as well as the overflow of the condensers two and three for the drains of the purification, is taken into the system for dissolution of reagents, after which the purified water goes to the piping of the return water, and the condensed concentrate Cu-Mo is taken to the conditioner, where it is conditioned with sodium hydrosulfϊde and emulated oil D2, and the pulp is diluted to the basic flotation - washing 40% and basic flotation 25%, while the drain of the tailing is taken to the condenser for Cu. 2. The process, according to the Request 1, marked by coarse concentrate of Mo being taken for additional grinding and classification, and the sand of the hydrocyclone is returned in the grinder, while the concentrate of the first purification represents the entrance to the cells of the second purification, and the drain of the first purification is transported to the condenser for purification, the overflow of the condenser is pumped to the condenser of Cu concentrate, and the condensed pulp from the condenser with 60% of solid phase is taken to the grinding and classification cycle by pumps, the drain of the second stage of purification flows to the entrance of the first purification, while the concentrate of the second purification is taken to the entrance to the third purification and the drain of the third purification is transported to the entrance to the condenser. 3. The process, according to the Requests 1 and 2, marked by the overflow of the condenser being taken to the copper condenser and the product of the condensation being transported to the entrance to the first stage of the purification, while the concentrate of the third purification is taken to the entrance of the fourth stage and is taken to the entrance to the fifth purification. 4. The process, according to the Requests 1, 2 and 3, marked by the drains of the fourth and fifth purification being taken to the condenser of the drain of the third purification making the concentrate of molybdenum which is then filtrated into the disk filter and into the spiral drier heated with coal, transported to the bunker and then in the drum which is transported for sampling, marking, closing and storing before the delivery by a cylindrical transporter. Signature of the Applicant |
Cu-Mo
The domain of technology that the invention refers to
In general, the invention refers to the separation of hard materials by additional treatment of the concentrate using flotation, and in particular - to the process of extracting molybdenum from copper ores.
According to the International Patent Classification, the invention is sorted, i.e. classified and marked with classification symbols B03D 1/02 and B03B 5/28.
Technical Problem
The technical problem solved through this invention is: how to supply a technological solution for an economic production of molybdenum from the ore that has a 50% lower concentration compared to the average value in the world by adding the SYNTEX-L reagent in the process of basic flotation of the copper minerals, condensation of the collective concentrate Cu-Mo in the condenser, conditioning, desorption and additional treatment by using triple condensation and process development in five degrees.
State of the Technology
It is well known that molybdenite (MoS2) is a significant side product of copper ores processing. In certain periods of time, like in the past years, molybdenum is very important for the economic work of copper ores processing plants. In the valorization of non-ferrous metals ores with lower concentration two technical-technological solutions in processing the complex ores of the non-ferrous metals with accompanying molybdenum are mainly used. When there is a higher concentration of Mo, evaporation pulp at 80-100 0 C is combined with flotation concentration based on the electrostatic characteristics of the mineral surface; the other approach is characterized by the concentration flotation based on the electrostatic characteristics of the mineral surface for lower concentrations of the molybdenum mineral in the ore. In classic processes where the Mo reagent was not added, the exploitation of the molybdenum was 40-60%, while the exploitation of molybdenum with usage of the proposed process is 70-86%.
No similar solution of this technical problem was found by searching the patent documentation and references of this domain.
Presentation of the Essence of the Invention
The process begins with adding the SYNTEX-L reagent in the process of the basic flotation of the copper mineral in order to increase the exploitation for 20%. Condensed collective concentrate of copper and molybdenum is conditioned, and then the desorbent of the collector membrane from the mineral surfaces is conducted with sodium hydrosulfide as the primary adsorbent, and NaCN as the secondary adsorbent. After the depression, the pulp that is the drain of the basic flotation and first purification goes to the second condenser, and the drains of the third, forth, and fifth purification go to the third condenser for the concentrate washing. The role of the condenser is very important: washing of the concentrate and better distribution of the useful elements compared to the entered ore, meaning:
Element → Cu;% Mo;% Content → 0,760 50,00
Coarse concentrate of molybdenum goes to the hydrocyclone for classification. The sand of the hydrocyclone is additionally ground in a grinder with balls, which works in a closed cycle with the hydrocyclone. The overflow of the hydrocyclone is taken in the purification process. The final concentrate of molybdenum is reached after the fifth purification and it goes to the filter for the filtration, and then in the drying furnace. The existing technologies have minimum 7-10 purifications.
Short Description of the Pictures of the Scheme
The invention is described in detail in the example of the process given in the scheme in which:
Picture no.l represents a scheme of the technological process for concentrating molybdenum from a collective concentrate of Cu-Mo given with 5 appendices and
Picture no.2 represents a pneumatic cell. Detailed Description of the Invention
The process refers to several stages:
— Addition of the SYNTEC-L reagent (0,2 g/t) and D 2 in the process of the basic flotation of the copper mineral, in order to increase the exploitation of Mo for 20%;
— Condensation of the collective concentrate Cu-Mo. Drain of the condenser, as well as the drain of the condensers 2 and 3 for the drains of the purification, is taken to the system for dissolution of the reagents, then the purified water goes to the piping of the reverse water;
— Condensed concentrate Cu-Mo is taken to the conditioner, where it is conditioned with sodium hydrosulfide and emulated D 2 oil. The pulp is diluted to basic flotation - washing 40% and basic flotation 25%;
— The drain of the basic flotation is final tailing, which represents the final copper concentrate and is taken to the copper condenser.
— Coarse concentrate of Mo goes to the additional grinding and classification. The sand of the hydrocyclone is returned in the grinder, and the overflow is taken to the first purification.
— Concentrate of the first purification represents the entrance to the cells of the second purification. The drain of the first purification is transported to the condenser for purification. The overflow of the condenser is pumped to the Cu concentrate condenser. Condensed pulp from the condenser with 60% of solid phase is pumped in the cycle of grinding and classification;
— Drain of the second stage of purification flows to the entrance of the first purification. While the concentrate of the second purification is going through the entrance of the third purification,
— Drain of the third purification is transported to the entrance to the condenser. The overflow of the condenser is taken to the copper condenser. The product of the condensation is transported to the entrance to the first stage of the purification. The concentrate of the third purification is taken to the entrance to the forth stage;
— Concentrate of the forth stage of purification is taken to the entrance to the fifth purification. The drains of the forth and fifth purification are taken to the condenser of the drains of the third purification;
— Concentrate of the fifth stage of purification is the final concentrate of molybdenum;
— Final concentrate of molybdenum is then filtrated in the disk filter;
— Filtrated concentrate of Mo is taken into the spiral drier (heated with oil);
— Dried concentrate is transported to the bunker;
— From the bunker, the concentrate is let out in the drum; — Full drum is transported to sampling, marking, closing and storage before delivery by a cylindrical transporter.
PRIMARY DEPRIMATOR (NaSH) for Cu (sodium hydrosulfide) • Places of reagent dosage Amount Volume
Kg/t 1/min
20%C
Conditioner 10 25,0
Basic flotation 5 12,5
Washing-attrition 0,5 1,3
First stage of purification 1,0 2,5
Second stage of purification 0,5 1,3
TOTAL: 17,0 42,6
With H 2 SO 4 , pH is regulated to 8,5-9,0. • SECUNDARY DEPRIMATOR for Cu (CaCN)
(sodium cyanide) • Places of adding Amount Volume Kg/t 1/min 20% C
Third purification 0,4 1,0 Forth purification 0,4 1,0
TOTAL: 0,8 2,0
• DIESEL OIL D 2 - Places of adding Amount Volume
Kg/t ml/min
Washing-attrition 0,10 56 Additional grinding 0,01 6
TOTAL: 0,11 62
• ADDITION OF EXFOAM 636 Places of adding Amount Volume
Kg/t ml/min
Third stage of purification 0,075 • 47 Fourth stage of purification 0,050 32
The technical problem solved with this application is providing a technological solution for an economic production of molybdenum from an ore that has a 50% lower concentration compared to the average value in the world. It is well known that molybdenite (MoS2) is a significant side product of copper ores processing. In certain periods of time, like in the past years, molybdenum is very important for the economic work of copper ores processing plants. In the valorization of non- ferrous metals ores with lower concentration two technical-technological solutions in processing the complex ores of the non-ferrous metals with contain molybdenum are mainly used. When there is a higher concentration of Mo, evaporation pulp at 80-100 0 C is combined with flotation concentration based on the electrostatic characteristics of the mineral surface; the other approach is characterized by the concentration flotation based on the electrostatic characteristics of the mineral surface for lower concentrations of the molybdenum mineral in the ore. In the proposed process in the cycle of copper mineral flotation molybdenum reagent is added beside the standard reagents regimen for the copper minerals. Exploitation of molybdenum of 70 to 86% is achieved. This would enable an economical possibility for extraction of the concentrate of molybdenum as a commercial product. Without adding reagents for Mo, the exploitation ranged from 40 to 60%. Adding reagent SYNTEX-L combined with D 2 in small amounts 0,2 and 2,0 g/t, collector SYNTEX-L beside its collector properties is also a dispergator, which leads to dispersion of D 2 to very small drops that contact beads 1-20 μm large, which leads to desorbent as well.
Content of these largeness classes is high, ranging from 24 to 30%, due to low hardness of MoS 2 , which leads to greater and greater granulation in the grinding process. Besides, very small additional amounts of Mo reagents do not affect the stability of the flotation concentration of the minerals of Cu and contain metals.
At the fifth stage of purification, a pneumatic cell (column) MG 1,7x10,268, picture 2, is used beside the subaerational Denver cells because of better regulation of aeration, which excludes the possibility of hydrophobized mineral grain leaving the surface of the air bubble, which is the case with the mechanical cells. The greater layer of the mineralized foam is also a filter for the separation of the mechanically carried grains of tailing, due to which the higher quality of the concentrate and better technological exploitation are achieved. This and shorter time of flotation in the column compared to the mechanical cell has enabled getting the commercial quality of the Mo concentrate after only five purifications. Usage of mechanical cells raises the number of purifications to min. 7 - 10 stages. Besides, the column works without an electric motor, there are no rotating parts, which make it considerably more economic from the aspect of lower maintenance costs compared to the classic cells.
Based on fundamental, laboratory, half-industrial and industrial trials, stated characteristic were extracted and the optimal scheme of the technological process was reached.
According to the parameters of the flotation of molybdenite from the copper concentrate, the following balance of metals is reached:
The proposed procedure of the technological process of flotation of molybdenite from the concentrate of copper of Majdanpek flotation increased the exploitation of molybdenum in copper concentrate for 21% and separated molybdenite in a separate concentrate.
Condensed collective concentrate of copper and molybdenum is conditioned, and then the desorbent of the collector membrane from the mineral surfaces is conducted with sodium hydrosulfide as the primary adsorbent, and NaCN as the secondary adsorbent. After the depression, the pulp that is the drain of the basic flotation and first purification goes to the second condenser, and the drains of the third, forth, and fifth purification go to the third condenser for the concentrate washing. The role of the condenser is very important: washing of the concentrate and better distribution of the useful elements compared to the entered ore, meaning:
Element → Cu;% Mo;% Content → 0,760 50,00 Coarse concentrate of molybdenum goes to the hydrocyclone for two-stage grinding and classification. The sand of the hydrocyclone is additionally ground in a grinder with balls, which works in a closed cycle with the hydrocyclone. The overflow of the hydrocyclone is taken in the purification process. The final concentrate of molybdenum is reached after the fifth purification and it goes to the filter for the filtration, and then in the drying furnace. The existing technologies have minimum 7-10 purifications.
The newly constructed pneumatic cell-column has better separation conditions compared to other mechanical cells and other types of pneumatic cells because there is only one longest zone for paced moving of pulp with maximum addition of air.
The optimal aeration is provided by water and air system, through the air bubbles generator. This system provides following consumption:
- Of air: Q=3-5 nrVmin, P=5 bar
- Of water: Q=200 1/min, P=5 bar
Water and air are taken into the column through two independent systems. They are first taken into the air bubbles generator - a sintered pipe with pores 64μm large, while air is taken through the inner part of the pipe, and water along the rim. At the exit, formed air bubbles flow into the column. By the reciprocal effects of aeration and foamier added to the pulp, mineralized foam high above 30 cm is created, which enables the achievement of the high quality of Mo concentrate, above 50% of Mo. The practicality of this pulp aeration system is a consequence of the constructive solution and position of the air bubbles generator regarding the place of putting the pulp into the column, by which the elimination of air bubbles merging is achieved, which happens when using other types of columns and mechanical cells.
The increase of the air put into the column above 55% of the volume is especially significant, and is realized at renowned productors: Jamenson cele 41% and Wemco/Leeds 39%. Also, getting uniformed radii of air bubbles by conducting air through the equal pores of the sintered pipe (64μm) in the air bubbles generator is also significant and affects the improvement of exploitation of useful components positively.