SU1720718A1 - Method for control of washing and classification of phosphoric ores - Google Patents

Abstract

The invention relates to the enrichment of ores by washing and classification, automating the management of these processes and can be used in the production of mineral phosphate fertilizers. The goal is to increase the productivity of technological sections by maximizing the performance of classifiers of technological sections on solid in the drain. In the method of controlling the washing processes and classifying the ratio of ore and water consumption to the flushing drums and classifying minerals by variable size, the content of useful minerals is measured in the process section classifiers and the additional classifier, and the current value is calculated content of useful minerals in the total concentrate using the material balance equation for the total concentrate, compare the current calculated value With the specified and proportional to the deviation, the content of useful minerals and the mass flow of small concentrate from the additional classifier are measured by changing the mode in this classifier by simultaneously changing the density of the drain and the position of its gate, while the density and maximum discharge of the classifiers of the technological sections are stabilized by changes, respectively, of the supply of ore to the flushing drums and water to the classifiers of the process sections. 1 il. sl C x | o About XI 00

Description

The invention relates to the field of enrichment of ores by washing and classification, automating the management of these processes and can be used in the production of mineral phosphate fertilizers.

There is a method of automatically controlling the process of ore enrichment by

measuring the flow rate of the solid and liquid phases; controlling the flow rate of the liquid phase is proportional to the measured value of the solid flow rate and the specified ratio of the solid and liquid phases. To stabilize the quality of the concentrate obtained by reducing the loss of useful minerals in the fines, an additional measurement of the relative content of the useful mineral in the fines is made and the flow of solid and water in the process is adjusted in proportion to the measured content.

The disadvantages of the method of automatic control of the ore dressing process are the low productivity of the 0.5 mm grade concentrate due to the insufficient capacity of the washing drum of the section and the redundancy of the control units.

The closest to the invention is a method of controlling the washing processes and classifying phosphorite ores by adjusting the ratio of ore to water consumption to the washing drums of each process section, measuring the density of the additional classification by variable size, and the content of useful minerals in the total concentrate. In proportion to the measured values of the density and the content of useful minerals in the concentrate, the ore feed into the washing process is changed. This makes it possible to increase the productivity due to the additional extraction of valuable components from the tailings with phosphorite ore particles with a smaller separation size.

The disadvantage of this method of controlling the washing processes and the classification of phosphorite ores is the poor quality of regulation of the content of useful minerals in the total concentrate due to the large error in measuring this parameter with a radioactive phosphorus indicator (RIF) or a X-ray fluorescence quantometer (CRF). This is due to the fact that with continuous indirect measurement of useful minerals (P lOs) with an FIR indicator, a layer of fine concentrate located on the conveyor belt (sands of the additional classifier) with a P2U5 content below the specified value absorbs the radioactive radiation of the lower layer of large concentrate with a PaOs content higher than the specified value, as well as low and variable correlation coefficient between PzOs and radioactive element (uranium) when measuring a concentrate with a PaOs content of more than 15%.

In the case of a discrete measurement of PzOs with a device with CRF or CPM spectrometers, the measurement error is due to the greater complexity and the inability to take a representative sample from the total concentrate conveyor to determine P2U5 for fluctuations in mass flow rates, coarseness, thickness of layers and a significant difference in the content of P20s in large and small concentrates . Quality of P20s control in total concentrate

also reduced due to the large transport and capacitive lag in the control channel: the flow rate of the original ore to the flushing drums and classifiers (sinks) of the process sections is the density of the additional classifier and the P2U5 content in the total concentrate, which is 8-10 minutes.

The main disadvantage of the iestostnogo method is to reduce the performance of technological sections with increasing density of the additional classifier.

The aim of the invention is to improve the performance of technological sections by maximizing the performance of classifiers for solid in the drain.

The goal is achieved by the fact that with the method of controlling the processes of washing and classifying phosphorite ores

by adjusting the ratio of ore to water consumption in flushing drums and classifying minerals by variable size in process section classifiers and an additional classifier, the content of useful minerals is measured and the mass flow rates of large and small concentrates are measured, while calculating the current value of the useful minerals generally

concentrate according to the well-known material balance equation for total concentrate

/ g + / mum

# .general.-, (1)

where D is the content of useful minerals, respectively, in large and small concentrates;

CC, UM - output, respectively, of large and small concentrates,

compare the current calculated value with the specified and proportional to the deviation change the content of useful minerals and the mass flow of fine concentrate from the additional classifier by changing the mode in this classifier by simultaneously changing the density of the drain and the position of its gate, while the density and maximum flow rate of the classifiers of the technological sections stabilize by changing the supply of ore to the washing drums and water to the classifiers of technological sections.

The drawing shows a diagram of the automatic control of the washing process and the classification of phosphorite ores.

The phosphorite ore of the Verkhnekamskiy phosrudnik (VKFR) was enriched with natural natural radioactivity. Phosphoritic ore included phosphoric anhydride (Р20b) within 7.0-16%, as well as clay and glauconitic sand.

The source phosphate ore to be enriched is fed to each process section 1 through bins 2. From the bunker 2, the ore is electrically driven by elevator 3 to the screen 5, where it is washed with water and separated into 100 mm of boundary size. A class of +100 mm is fed to the conveyor 11, and a class of 100 mm is fed to the flushing drum 6.

After washing the ore in the drum 6, classes +25 and -25-10 mm, the passage through the conical screen 7 is divided into two streams and goes to the conveyor 11. At the same time, class-25 + 10 mm before being fed to the conveyor 11 is dehydrated at the screen 8 Grade -10 mm from washing drum 6 enters sink wash 9, where washing and classification of phosphate ore particles of an average particle size of 1.5 mm take place (possible separation size increase to 3 mm). As a result of washing the ore on screen 5, in the washing drum 6 and a sink wash 9, four flows are obtained concentrate (Passing through screens 5, 7, 8 and 10) with an average content Pads respectively from 24 to 20%, which is higher than a predetermined value, equal to 19%. These streams form a coarse concentrate that enters the warehouse 11 to the warehouse, with a content of PaAlso above a predetermined value. From the sink wash 9 of each technological section 1, particles of clay, sand and phosphate ore with a particle size of less than 1.5 mm with a drain enter the additional classifier 12 of the second stages of mineral separation by variable size (0.2 ... 0.6 mm).

The sand of the classifier 12 is fed through a dewatering screen 13 to the conveyor 14 of fine concentrate. The content of PaOg in the sands of the classifier 12 is a small concentrate of class -1.5 + 0.6 ... 0.2 mm less than the specified value of 19%.

The drain of the classifier 12 and the bottom pit bottom product 13 are fed to the tailings of the steering box. When the density and size of the drainage tank wash 9 deviates from the set value, the signals from the transmitter 15 are fed to the regulating device 16, which through the control block 17 smoothly or stepwise changes the speed of the electric drive 4 and the ore feed by the elevator 3 to the process section 1. Thus, the sensor 15. The regulating device 16, the control unit 17 with the electric drive 4 form a circuit 5 for adjusting the density of the drainage of the wash tank 9.

When the drainage flow increases or decreases, the regulating device 22 receives signals from the sensor 21, through 10 the control unit with the actuator 23 changes the water supply to the washbasin 9 and restores the set flow rate (flow control loop of the sink washtower 9). Stabilization of the density of the drain, corresponding to the specified separation size, and the discharge of the drain, the maximum value ensures the operation of the wash tank 9 with the maximum capacity of the solid in the drain, since the consumption of ore with discharge is determined by the well-known equation

G p T -Q t / h (2)

where - pulp density, t / m3;

T is the solids content in the pulp,%; 5 Q - volumetric discharge flow, m3 / h.

At the same time, in order to maintain the maximum productivity of the sink wash 9 through the solid in the sink, the ore supply to the technological section 1 is increased accordingly, i.e. increase its productivity and stabilize the load on the classifier 12 of the second separation stage.

In recent years, in ores coming from different quarters of VKFR, the output of the class -10 mm has increased, which, accordingly, has increased the load on the classifier (sinks 9). which limited the productivity of technology sections 1. Therefore, maximizing the performance of the tank washers along the solid in the sink also increases the productivity of the washer.

Water consumption for washing in the drum 6

5 adjustable in proportion to speed

electric drive 4, elevator 3, indirectly

 determining ore consumption for section 1.

Some of this water goes to screen 5 dl.

washing class +100 mm, and then sent to the drum 6 with class-100 mm, with

this total consumption remains constant.

At the optimum speed of the electric drive 4, the regulating device 19, receiving signals only from the sensor 18, maintains 5 through the regulating body 20 with the actuator an optimum flow of water to the screen 5 and the flushing drum 6. The sensor 18, the regulating device 19 and the regulating organ 20c with the executive mechanism form a loop regulating the flow of water into the flushing drum 6.

When the speed of the electric drive 4 changes, the regulating device 19 is supplied from the control unit 17 by an additional signal proportional to the flow of water to the screen 5 and the washing drum 6. In order to be able to control the content of P20s in the total concentrate, a set of means is provided that consists of a drainage control loop classifier 12 with a sensor 24, a regulating device 25 and a regulating body 26 with an actuator, the control loop for adjusting the position of the gate 29 of the classifier 12 with a regulating The instrument 27, an actuator 28 of the microprocessor 32 with the sensors 30 and 33, mass flow rates, respectively coarse and fine concentrates, blocks 31 and 34 control the content P2U5 respectively in large and small block 35 and concentrates the manual ezoda information.

Regulatory): ® content of P20s in total concentrate (/ Zo) is based on its dependence on the content of useful minerals and the output of large and small concentrates, respectively, which is described by the following equation (1):

about Acfo. + flOfr. P ° UK + Um

In our example, the content of useful minerals P20s in a large concentrate consisting of four concentrate flows is determined by the equation

/ - # U1-y # Y2 + & Uz + & Y4 ...

RC u1 + y2-1-uz + y4 P) where p, / fc, $ 3, {h is the mineral content in the classes +100 mm, -100 + 25, -25 + 10 and -10 + 15 mm, respectively.

yi, Y2, knots, Y4 - concentrate output, respectively, in the same classes.

The current value of the PaOs content in the total concentrate, in accordance with equation (1), is calculated by the microprocessor 32, which performs the functions of a control computer, to the inputs of which signals from blocks 31 and 34 are received. Control of the PaOs content in large and small concentrates, as well as signals from the sensors 30 and 33 of the mass consumption of large and small concentrates. In the absence of blocks 31 and 34 of controlling the content of PaOs to the microprocessor 32 through block 35, the operator enters a priori information about the average values of these parameters s in large and small concentrates. (These data for ores of various deposits are given by geologists and beneficiaries in

the beginning of the flushing season, then they are tabulated and periodically adjusted as the deposits are developed). Signal proportional to the current

P20b content in total concentrate, with

microprocessor computing unit

32 enters its control unit, where

compared to a given signal of the content of P20s. If the calculated current value of P20s in the total concentrate is equal to the set value, then signals from the microprocessor control unit 32 are not sent to the drainage density control circuits and the position of the gate 29 of the classifier 12,

5 In this case, the separation mode of minerals in the classifier 12 corresponds to the average values of density and size (for example, 0.4 mm) of discharge and the average position of the gate 29 of the classifier 12, which indirectly determines the level of pulp and the area of mineral deposition in it. This mode is supported by the regulating device 25 of the drainage control loop, which in this case, receiving a signal only

5 from the drain density sensor 24, through the regulator with the actuator 26 changes the water supply to the classifier 12, as well as the regulating device 27 of the position control loop of the gate 29, which, also receiving only the signal from the actuator 28 of the actuator 28, installs gate 29 in the middle position. With an increase in the P20s content in the total concentrate, for example, as a result of an increase in the yield or the RHEP content in the large concentrate by regulating devices 25 and 27 circuits, adjusting the density of the discharge and the position of the gate 29

0 come from microprocessor 32 correction signals that reduce the density and size of the drain (for example, up to 0.2 mm) by increasing the water supply to the additional classifier 12, as well as moving the gate 29 upwards, increasing the level of pulp and the amount of mineral deposition in the bath classifier 12.

This mode provides an increase in the yield of sand — a fine concentrate of the additional classifier 12 and a decrease in its P20b content, which leads to a decrease in the content of P20s in the total concentrate.

When the total concentration of PaOs decreases, corrective signals from microprocessor / 32 through regulating devices 2t increase the density and particle size of the drain (for example, to 0.6 mm) and lower the width 29, decrease the pulp level and mineral deposition area by reducing the water supply. in classifier 12, which leads to a decrease in yield and an increase in the content of P2U5 in small concentrate, and consequently, an increase in the content in the total concentrate.

In the process of adjusting the classification mode in the spiral classifier 12 with a spiral diameter of 1.5 m, the delay in the water flow rate - discharge density - output and the content of PaOz in small concentrate is about 4 minutes, and in the channel the position of the gate 29 - pulp level - output and content P20s in fine concentrate no more than 1 min.

Example, Automatic control of the PzOs content in the total concentrate using sensors 30 and 33 of mass flow rates and blocks P30s 34 and 34 of controlling the content of P20s in large and small concentrates together with the microprocessor 32 is described in detail.

In the case of semi-automatic regulation of the content of P20s in the total concentrate without the control unit 31 and 34 of this parameter, the operator performs the following operations.

Receives information from the receiver and the mining dispatcher on the deposit and the amount of railroad feed for the enrichment of phosphate rock. For example, ore was mined at the open pit No. 1 of the Verkhnekamsky fosrudnik, the number of railcar wagons is 10, the total weight is 400 tons.

It determines according to the table compiled by geologists at the beginning of the washing season, the yield and content of P20s in a large concentrate of class +1.5 mm. For example, ore from open pit No. 1, coarse concentrate dry weight is 39.2%, P205 content is 24.7%.

In tál. Table 1 shows the sampling data of cholera phosphate of ICPR for 1989, and also indicates the yield values fy, angle, knots. YA) and the contents of PaOs, p2, Dz,) respectively in classes +100, -100. +25, -25 +10, -10 + 1.5;

In this case, using equation (3), one can verify the correctness of the determination of the PaOs content in a large concentrate of +1.5 mm class:

a # P + D P + Dz Uz + A y

And y} + y2 + y3 + y

24.7%.

In tab. 2 shows the modes, operation, classifier in the separation of salivary phosphorite class -1.5 +0, arriving with drains of trough sinks.

The operator determines according to the table. 2 mode of classification of this ore at the processing plant in the classifier 12, in which the output and content of P20s in small concentrate - dewatered sands of classifier 12 correspond to obtaining a total concentrate with a P20s content in the range of 5 not 19, 4% for a given content of 19.0%.

Tab. 2 is compiled by process enrichment technicians at the start of the washing season, based on the research indicated in

0 table ore for dressability.

For example, the classification of ore from pit No. 1, which comes from the sinks of the washing tanks 9, at a density of classifier 12 equal to 1.21 t / m3, and at a height of 5 5, provides for 1.0 m. 27% of the output of fine concentrate with the content of Р20з 11.8%.

Check by equation (1) the content of P20b in total concentrate:

0 ft.ftrj. + Frp. -19.4%.

The operator then enters into the microprocessor 32 a priori information about the mean values of the P20s in the large and

5 small concentrates. Transmits the receiver information about the loading of ore in the bunkers 2 technological sections.

After filling with ore and pulp of technological devices or the end of a transient process, the microprocessor 32 indicators show the mass flow rates of large and small concentrates, corresponding to a yield of large concentrates of 39.2% and small ones of 27.0% of total dry weight.

At the same time, the mass consumption of coarse and fine concentrates, as well as the productivity of technological sections 1, are determined as follows. With

0 of constant density (1.44 t / m3) and discharge of the discharge (150 m3 / h) of the corytny sinks 9, the consumption of solid in the pulp of the class -1.5 mm fed to the classifier 12. According to equation (2)

5 G-1.5 UOt / h.

This load on the ore class -1.5 mm with a yield of 60.8% on dry weight to the classifier 12 is supported by density regulators 16 and drain regulators 22

0 trough washings 9 technological sections. At the same time, the mass flow rate of coarse concentrate with an output of 39.2% will make G + 1 5 64.2 t / h.

The capacity of sections 1 Gc G + 1.5 + G-1.5 is 164.2 t / h.

Mass flow of fine concentrate - sand classifier 12 with a yield of 27% GM 44.3 t / h.

Substituting the mass flow rates into equation (1), the P20s content in the total concentrate is obtained:

ft-ftft.ffiE -mE.

The mass flow rate of coarse concentrate on wet weight at a humidity of 11% is 72.1 t / h, the mass flow rate of fine concentrate on raw weight at a humidity of 17% is 53.4 t / h (Table 2).

After that, the operator determines, using microprocessor indicators 32, the current values of the mass flow rates — the raw weight of the large and small concentrates, corresponding to the calculated values.

If the mass flow of large concentrate deviates by more than + 15% from the calculated one, the operator introduces to the microprocessor 32 a new value of the P20s content in the small concentrate, which causes a change in the output of the small concentrate to maintain the specified P20g content in the total concentrate.

For example, the current mass flow rate of coarse concentrate is 60.6 t / h, which is 11.5 t / h or 16% less than calculated. Since the average value of PaOs in a large concentrate remains constant and does not depend on the yield of large concentrate, in order to obtain a given content of P20svB total concentrate, it is necessary to change the classification mode to the side, decrease the yield and increase the content of P20s in small concentrate, t. e. increase the density of the discharge classifier 12 and reduce the height of the gate 29.

At the same time, the new values of the P20.5 content. And the output of fine concentrate should be 12.4% and 38 t / h, respectively, on dry basis or 45.6 t / h on raw weight.

Check the content of PiOs e total concentrate with a modified classification mode:

#, - 19.4%.

The specified data on the change of classification modes are issued to the operator by technologists additionally.

During the period of operation, the operator receives from the .receiver information about the minimum amount of ore from the open pit Mg 1 in bunkers 2 and about the deposit and the amount of newly fed ore for enrichment. For example, ore from open pit 2, the amount of 500 tons. 5-7 minutes before the end of the supply of 2 ores from open pit bins from the open pit Mg 1 in the indicated order according to the tables, the operator determines the mass flow rates and the content of P20s in large and small

concentrate. With the total output of the ore of the open pit N 1 from the bins 2 to the process sections 1, the operator enters the microprocessor 32 with certain values of P20s in small and large concentrates and instructs the receiver to load 2 bins of ore from pit 2. After that, the operator performs , similar to the beneficiation of ore career number 1

Laboratory tests conducted on the ICPRF showed that the proposed method, when manually entering information about the value of P20s in large and small concentrates and automatic discrete measurement of these parameters by known CPM X-ray spectrometers, maintains the P20s content in the total concentrate with an accuracy of ± 0.49 and 0, 28% of the target value of 19%, and also increases the productivity of the washer and the extraction of useful minerals, respectively, by 0.5 and 0.63%.

Form m at la of gain

The method of controlling the washing processes and the classification of phosphorite ores. based on the regulation of the ratio of ore to water in the flushing drums and the classification of minerals by

variable size in the classifications of technological sections and an additional classifier, characterized in that, in order to increase the productivity of technological sections by

maximizing the productivity of classifiers of technological sections by solid in the discharge, the content of useful minerals is measured and the mass flow rates of large and small concentrate are measured, the current value of the content of useful minerals in the total concentrate is calculated using the material balance equation for the total concentrate, the current calculated value is compared

with a given and in proportion to the deviation, the content of useful minerals and the mass flow of fine concentrate from the additional classifier are changed by changing the regime in this.

classifier due to the simultaneous change in the density of the drain and the position of its gate, while the density and maximum discharge of the classifiers of technological sections are stabilized by

changes, respectively, of the supply of ore to the flushing drums and water to the classifiers of the process sections.

 W

career

career

career

03.89 .1.5 12.8 03.891,110.3

02.894, G 18.0

18.06.9 39.2 60.8 25.3 25.2 25.1.3 23.09 24.7 10.5 19.27.0 37.6 62.4 23.5 2-0.320.1 18.82.0, 2 8.3

16.18,6V 46,8 53,2 26,3 26,2 25,1 22,7 22,16 9,7

Table

Claims (1)

Claim A method for controlling the washing and classification of phosphate rock ores, based on the regulation of the ratio of ore to water consumption in washing drums and the classification of minerals by variable fineness in the classifiers of technological sections and an additional classifier, characterized in that, in order to increase the productivity of technological sections by maximizing the performance of classifiers technological sections on solid in the sink, measure the content of useful minerals and measure the mass flow of sweat coarse and fine concentrates, calculate the current value of the content of useful minerals in the total concentrate according to the equation of material balance for the total concentrate, compare the current calculated value with the set and proportionally to the deviation change the content of useful minerals and the mass flow of fine concentrate from the additional classifier by changing the mode to this, the classifier due to the simultaneous change in the density of the drain and the position of its gate, while the density and maximum flow with willow classifiers technology sections stabilized by varying the ore feed respectively in the washing water in the drums and classifiers technology sections. LA ΓΗ Α1720718 with Joint venture in about MF a. f f X Ct f a o LA a— -4 * cm cm ABOUT CM ’cm see I go X a f _ ct f o O x o x co X f s’ I ** A О X c £ l ф = г X о У фаго 00 CA <l I I I I I I t I I I g * SP O • ίο 9 Go 1 1 g - 1 GA With cm 101 0 1 1 1 1 CM cm I About 1 | * ...... · »| GO1 GO 1 eleven 1 go ί 1 about 1 t-ι At 1 1 G- | GA . | 1 + 1 V * - t— 1 0 1 1 LA 1 • h "to Gk 1 E 1 D SM 1 LA about LA 1 · <* ₽ 1 1 1 1 CM cm cm I f A I I 1 GO 1 I 1 X cm C about ha 1 1 1 about ί a a. X X and in? 1 so I 1 = G1 X 1 <U Cl 1- 1 A- cm G— 1 1 1 1 CI GO U 7 X * 1 •to ·> *· 1 1 X 1 about ί oh x ABOUT about X ! -4* about CM 1 1 1 1 about x m X = r o 1 CM cm mid 1 1 A 1 about ! ί I about X I Ju 1 E 1 1 I V GO a X 1 1 GO 1 >> CL GO 1 ί o 1 o Oh with X about X l 1 about 1 X A 1 1 o F st a about N 1 * A * 1 1 GO 1 go 43 η L go X 1 mid A- O. 1 ; X GO X and with ABOUT 1 g-- 43 - I 1l * o Σ a. ha e go about. x x I. 3 "3 ee a a> st o o LA CM + O O CM GA CM * * · * LA ABOUT 40 CM CM CM • GA LA GA •to *. "H LA Joint venture 40 CM CM CM OO -4- cm m a l ABOUT CM CA 40 40 LA a I c: f (X: GO a go s: LA A X F = G 00 joint venture I 1 Oh and and go O x ^s o >> g. 1 1 1 cm cm Joint venture and > x ct x about · - 1 l - ·> go l About x f ss 1 -4 about A- X with x υ with ABOUT I 40 cho OO >> X about X> »υ go and X and go GO О Е“ X about. >> s + '-P MF I go A go a. X f = r X _ about a x and F f x ct f ΙΑ CM + О> 1 О Ф (Л I o a E O O Οζ X X GO s about Ct ABOUT. F O. GO X me a> " I go X go X A • e go ha O Ιο I GO F c X X sa O X and f E cm "to 40 ^ OO "to 1 1 1 Joint venture Α- 40 1 thirteen Joint venture ΓΑ -4 1 ί a about 1 0 th a X x X a E 1 about X A- and ct about X well • and > X 0 a about m X go l X l a) from; A x: with and about w With and "4* GA LA -4t I I ABOUT. 1" 1 go X w 1 GS A- go t FROM) - 1 * • h about go | cm ABOUT Her Oh-ss_ -1 T “ About cd I 1 About go a 1 >> 0 about GO and X X ! GA and Eh ABOUT X go □ * 1 * · che go 3 X about about go 1 -4 * · X With about E X with f -4 Joint venture ΑΓΑ 1 Ct >> ' 1 1 go go 1 about go 1 Joint venture about from 1 | about. a 1 X X th 1 • h • h * 1 1 go about 1 4) about oh go 1 With A- CO 1 1 E N 1 αι from X Joch ¹ 1 1 1 1 CM t 1 1 go 1 1 | 1 £ P GO 1 * 1 1 I x a I go go  1 about CM g— | 1 T o 1 A a 1 l a * 1 1 GO F 1 about go 1 OO Joint venture from 1 1 GO | go Yu 1 1 t 3 y 1 J3 X 1 [ 1 a x 1 ss 3 X 1 - - * ABOUT AFM LA With GA f X go a go CZ X and and go with X A 43 A l e 43 about and q from; from X from: X FROM Άτ * X di'b see cm ha about 1 • h ' l m | ! ---------------------------, --------------------- ---------------------------------1 1 cm ABOUT. SS 1 1 At 1 h from go 1 , 1 1 G “ G “ t — I 1 <1> 1 ABOUT go E 1 1 | I about 1 X a With 4) 1 t ! X 1 0 go go 1 1 1 1 1 go with about X * ’-H 1 1 1 1 X 1 about_ A L- E oh b - | about 1 1 1 3 A --- U oh oh X LA I I "H * 1 eleven- ·! go 1 1 -4 * 1 1 3 1 about go " 1 a ί a go. With FROM- 1. 1 about 1 <1) a 1 | 1 y 1 ST go w go 1 1 eleven about X with about X ~ 1 / | 1 CO 1 Cj X A L. with n Ct s about his X J3 X and E GO> »* th- E o * fl Joint venture Joint venture Joint venture 1 1 1 About “00 1 1 OO OO OO 1 | - X 1 1 • 0 0 I 9 GO 1 1 GA gp cm I 1 About 1 1 ABOUT about about | 1 9. 1 1 1 9 1 l 1 a ί | 1 1 A 1- I 1 . 9 GO 1 I 9 9 X 1 9 a a about. 1 1 GO 1 . 1 go f go 1 1 a s 1 L L L 1 1 GO 1 1 a " a ABOUT. 1 9 from: ί 1 go GO GO 9 A I I I I I t cm -4 * cm Ha £ 40 ha LA "Y I I I 1 I I -4* About LA g-4 About LA About LA L | L E 9 1 A I- L • L 9 -4 -4" -4- 1 about 0 go X 9 -4· -4- -4 1 go about X HF · —C, 1 η *> * 1 e: X E a_n 1 G “ "- 1 1 I I I I * I I £ about. f Oh go bi SM - I