Copper oxide acid leaching test

With the increasing depletion and easy dressing and smelting copper sulfide mineral resources, the use of copper oxide ore resources and more attention. The minerals contained in the copper oxide ore are complex and difficult to enhance the copper grade through beneficiation and enrichment. In this experiment, the copper oxide ore was leached with sulfuric acid, and the influence of various factors on the copper leaching rate was investigated.
   First, the test materials
The test raw material is a coarse-grained ore after crushing a copper ore in Yunnan, with a copper grade of 0.95%, belonging to a low-grade copper oxide ore. The copper minerals contained in the ore are mainly copper oxide minerals, most of which are malachite and chrysocolla, with a small amount of black copper, azurite and azurite; followed by copper sulfide minerals such as chalcopyrite , covellite, bornite and the like; other metal objects with a brown iron pyrite and magnetite; gangue minerals are quartz, dolomite and the like.
The results of chemical analysis of ore are shown in Table 1, and the results of chemical phase analysis are shown in Table 2.
Table 1 Analysis results of copper oxide ore elements
chemical composition
ω B /%
Cu
Fe
Zn
Pb
CaO
MgO
Al 2 O 3
SiO 2
0.95
10.35
0.32
0.03
7.66
13.53
10.23
414.63
Table 2 Results of chemical phase analysis of copper oxide ore
Phase
ω B /%
Occupancy rate /%
Free copper oxide
Combined copper oxide
Secondary copper sulfide
Primary copper sulfide price
all bronze
0.58
0.27
0.04
0.06
0.95
60.87
28.51
4.01
6.61
100.00
    Second, test methods and reagents, instruments
The leaching test was carried out in a 1000 mL beaker and mechanically stirred. After the leachate was filtered, the acidity and the mass concentration of each element were analyzed. The leaching residue was washed with water (several times) and dried to analyze the copper mass fraction and calculate the copper leaching rate.
Test reagent: industrial concentrated sulfuric acid, 17.93mol / L; hydrochloric acid, analytically pure, 12.14mol / L.
Test equipment: JJ-1 high-power electric mixer, automatic temperature control device (maximum temperature 300 °C), electric furnace, electric thermostat dryer, SHB-IIIA circulating water multi-purpose vacuum pump, 1000mL suction filter bottle, funnel.
Analytical instrument: XRF-1800 X-ray fluorescence spectrometer, GGX-6 atomic absorption spectrophotometer, lightning magnetic pHB-4 pH meter.
    Third, the test results and discussion
(1) Conditional test
In the single factor condition test, the effects of ore particle size, liquid solid product mass ratio, leaching time, temperature, sulfuric acid mass concentration and activator dosage on copper leaching rate were investigated.
1. Effect of ore particle size on leaching
The ore is ground by a vibrating mill and sieved using a 100-mesh standard sieve. The mass concentration of sulfuric acid is 50 g/L, the mass ratio of liquid solid product is 4 L/kg, and the mixture is leached at room temperature for 1 h. The test results are shown in Figure 1.
Figure 1 Effect of ore particle size on copper leaching rate
The ore particle size has little effect on copper leaching. The leaching rate of copper after grinding is increased. When the ore particle size is -100 mesh, 80%, the copper leaching rate is 61%, and then the leaching rate of copper is not reduced. Improve again.
2, the effect of liquid solid product mass ratio on leaching
The ore particle size is -100 mesh, 80%, the sulfuric acid mass concentration is 50 g/L, and the mixture is leached at room temperature for 2 h. The effect of different liquid solid volume-mass ratio on copper leaching rate is shown in Figure 2.
Fig. 2 Effect of mass ratio of liquid solid product on copper leaching rate
The liquid solid mass ratio has little effect on the copper leaching rate, the liquid solid mass ratio increases to 4 L/kg, and the copper leaching rate is stable at about 61%.
3. Effect of leaching time on copper and iron leaching rate
The ore particle size - 100 mesh accounted for 80%, the sulfate sulfate t concentration was 50 g / L, the liquid solid product mass ratio was 4 L / kg, and the mixture was leached for 3 h at room temperature. The liquid sample was taken every 10 minutes for the first 2 hours, and the liquid sample was taken every 20 minutes for the first 1 hour. The test results are shown in Figure 3.
Figure 3 Effect of leaching time on copper and iron leaching rates
In the first 20 minutes of leaching, copper leaching was faster, the leaching rate reached 57.27%, and the leaching rate increased slowly. After leaching for 50 minutes, the copper leaching rate was stable at about 61%, and the leaching rate of iron increased with the leaching time.
4, the effect of temperature on leaching
Ore particle size - 100 mesh accounted for 80%, sulfuric acid mass concentration 50g / L, liquid solid product mass ratio of 4L / kg, with a fully automatic temperature control device to control the leaching temperature, stirring leaching for 1h. The result is shown in Figure 4.
Figure 4 Effect of temperature on copper and iron leaching rate
The leaching temperature is favorable for the leaching of copper and iron. At 80 °C, the copper leaching rate is 76.6%, the iron leaching rate is 9.3%, the copper leaching rate is increased by 15% compared with room temperature, and the iron leaching rate is increased compared with room temperature. It is nearly three times, which also increases the amount of sulfuric acid.
5. Effect of solution sulfuric acid concentration on copper leaching rate
The ore particle size is -100 mesh accounted for 80%, the liquid solid product mass ratio is 4L/kg, and the mixture is leached for 2 hours at room temperature. The effect of sulfuric acid mass concentration on copper leaching rate is shown in Fig. 5. At room temperature, when the mass concentration of sulfuric acid is 10 g/L, the copper leaching rate is only 40%, and the leachate pH is 4.9. Sulfuric acid deficiency is the main reason for the low copper leaching rate. When the concentration of sulfuric acid t in the solution is higher than 30 g/L, the leaching rate of copper is stabilized at about 60%.
Figure 5 Effect of sulfuric acid concentration on copper leaching rate
6. Effect of activator dosage on copper leaching rate
The ore particle size is -100 mesh accounted for 80%, the sulfuric acid mass concentration is 50g/L, the liquid solid product mass ratio is 4L/kg, and the mixture is leached for 1 hour at room temperature. The effect of the amount of activator on the copper leaching rate is shown in Fig. 6.
Figure 6 Effect of activator dosage on copper leaching rate
The addition of the activator can improve the leaching kinetics, and the copper leaching rate can be increased by 5% when the mass concentration is 5 g/L.
7. Sulfuric acid mass concentration and sulfuric acid consumption
The leaching was carried out in sulfuric acid solutions of different mass concentrations, and the amount of sulfuric acid consumed by leaching 1 t of metallic copper under the corresponding conditions was calculated according to the copper leaching rate. The results are shown in Fig. 7. At the same concentration of sulfuric acid, the acid consumption at 80 ° C is significantly higher than 20 ° C, the higher the concentration of sulfuric acid in the solution, the more sulfuric acid is consumed during leaching. From the economic point of view, it is sufficient to leaching at a normal temperature with 30 g/L of sulfuric acid. Under this condition, the consumption of sulfuric acid per ton of copper is 11 tons.
Figure 7 Diagram of solution acid concentration (1t metal copper) and acid consumption
(2) Comprehensive condition test
According to the above test results, the control liquid solid product mass ratio is 4L / kg, sulfuric acid mass concentration 30g / L, room temperature, ore particle size - 100 mesh accounted for 80%, activator mass concentration 5g / L, stirring leaching 50min. The comprehensive test results of the three groups are shown in Table 3. The results of the phase analysis of the copper leaching slag are shown in Table 4.
Table 3 Comprehensive condition test results
Numbering
Ore quality / g
Liquid meter leaching rate%
Slag meter leaching rate%
E-1
E-2
E-3
50
100
200
65.8
64.9
64.8
64.9
64.5
64.2
Table 4 Phase analysis of copper in leaching slag
Free copper oxide
Combined copper oxide
Copper sulphide
ω/%
% share
Leach rate%
ω/%
% share
Leach rate%
ω/%
% share
Leach rate%
0.039
11.82
93.5
0.201
60.91
28.72
0.09
27.27
13.55
  Fourth, the conclusion
(1) The ore is highly oxidized, and combined with copper oxide accounts for 28.5%. At normal temperature, only free copper oxide can be leached with sulfuric acid, and the copper leaching rate is 61%.
(2) At normal temperature, after the concentration of sulfuric acid is higher than 30g/L, increasing the amount of sulfuric acid has no effect on the leaching of copper, and the impurity elements are leached in a large amount, which increases the consumption of sulfuric acid.
(3) The ore particle size is -100 mesh, which accounts for 80%, and the particle size is reduced again, which has little effect on increasing copper leaching rate.
(4) The elevated temperature can destroy the combined copper oxide in the ore. When the temperature is raised to 80 °C, the copper leaching rate is increased to 76%, but the iron in the ore also enters the solution in a large amount, consuming a large amount of sulfuric acid.
(5) The addition of activator can increase the copper leaching rate by 5%.

Description

* Sheel: 
  1. The Maxload Electric Chain Hoist is made of light aluminum alloy shell, light but hard.
  2. With cooling fin, easy and quick Bring the Heat out. 
* Break System: 
  1. Side Magnetic Braking Device, Ensure lock the hoist
  2. Mechanical braker, Dual braking system, much more safety.
* Limit Switch:
  With up & down Limit Switch, to prohibit the Chains from exceeding for safety.
* Chain:
  FEC G80 Chain, Origina imported from Japan. Anti-Rust and Anti-corrosion
* Electromagnetic contactor:
  1. With Schneider Electric (TESSIC), can be used safely under high frequency.
  2. Can be installed Variable-Vrequency Drive (VFD Electric) Can be suitable for Singlle Phase Power supply.
* Inverse phase sequence protecting device:
  It is sepcial electrical installation which controls the circuit not to work in case of wiring error in the power supply.
* Gear:
  The gear made of alloy steel, Through the heat treatment.
* Level of Protection Grade(IP Grade):
  1. Hoist IP Grade: IP54
  2. Push Buttom IP Grade: IP65
* Power supply:
  All kinds of voltage can be custom-made. 200V-660V, 50HZ/60HZ, 1P/3P
* Working Grade:

  M4/1Am



Versatile performance
Two hoist speeds as standard
Versatile adaptability to any task
Simple exchange of the load handling device thanks to quick-change coupling
For right-hand and left-hand operation


Specifications:

Type

Capacity
   (ton)

Standard
Lifting 
Height
(m)

Lifting 
Speed
(m/min)

Lifting Motor

Trolley Motor

I-Beam
(m/m)

Power
(Kw)

Rotation
speed
(r/min)

Phases

Voltage
(v)

Frequency
(Hz/s)

Power
(Kw)

Rotation
speed
(r/min)

Trolley
speed
(m/min)

HHBD00501-2S

0.5

3

6.8

0.75

1440

3

200-600

50

0.4

1440

11/21

58-153

HHBD0101-2S

1

3

6.6

1.5

1440

3

200-600

50

0.4

1440

11/21

58-153

HHBD0102-2S

1

3

3.4

0.75

1440

3

200-600

50

0.4

1440

11/21

58-153

HHBD01501-2S

1.5

3

8.8

3.0

1440

3

200-600

50

0.4

1440

11/21

82-178

HHBD0201-2S

2

3

6.6

3.0

1440

3

200-600

50

0.4

1440

11/21

82-178

HHBD0202-2S

2

3

3.3

1.5

1440

3

200-600

50

0.4

1440

11/21

82-178

HHBD02501-2S

2.5

3

5.4

3.0

1440

3

200-600

50

0.75

1440

11/21

100-178

HHBD0301-2S

3

3

5.4

3.0

1440

3

200-600

50

0.75

1440

11/21

100-178

HHBD0302-2S

3

3

4.4

3.0

1440

3

200-600

50

0.75

1440

11/21

100-178

HHBD0303-2S

3

3

2.2

1.5

1440

3

200-600

50

0.75

1440

11/21

100-178

HHBD0502-2S

5

3

2.7

3.0

1440

3

200-600

50

0.75

1440

11/21

100-178


High operating quality
Convenient single-handed handling and guidance of loads weighing up to 250 kg
Quick-change coupling for a variety of load handling attachments (load hooks, pantograph tongs, clamping and shaft grippers, parallel gripper systems, specifically developed load handling attachments)
Service-friendly thanks to diagnostics interface


High safety and reliability
24 V contactor control
FEM classification from 1Am to 4m
Slipping clutch with speed monitoring
No brake adjustment
No load dropping thanks to slipping clutch arranged in front of the brake
Operating limit switches

Products show:

380V electric chain hoist

double speed electric hoist

electric motor


Long service life
Gearbox, brake and slipping clutch maintenance-free for up to 10 years
Aluminium motor, gearbox and electrical cover parts provided with UV-resistant powder coating
Robust cylindrical-rotor motor with fan and separate brake beneath the electrical cover


Hoist Questions

To send Electric Hoist most competitive price for you, please kindly send me details:
1. What is the lift capacity? 1T? 2T,5T-  
2. What is the lift height? 6m? 9m-

3. Do you need hoist with single lifting speed or double lifting speed? 
4. Do you need hoist with trolley to move on the beam or without trolley? Single travel speed or double travel speed?
5. What is the voltage?380V, 50Hz, 3 phase? 220V, 60HZ,3phase? Or something else.
6. Will used in Inflammable and explosive gas/ alkali and acid factory?

7. How many hoists do you need?


Our Services

1.Client

We treasure and try to understand all the different needs of our clients and seek to forge a long term professional relationship with them. The satisfaction of each and every customer is our main goal and motivation in conducting our business.

2. People

We work as a team and treat each other with respect. Our solid, capable and knowledgeable team is valued as the greatest asset and an integral part of the business.

3. Product

Our products are of HIGH quality standards and always come with certificate of compliance by the manufacturers.

4. Performance

We aim to achieve high level of performance and satisfaction to both our client and people, which include delivering high quality services and treating people with integrity.

5. Free sample and OEM service

We can provide free samples to you and we also have OEM service, we can put your logo on the label and the information you need on the webbing too.

 







Electric Chain Hoist

Electric Chain Hoist,Electric Chain Fall Hoist,Electric Chain Hoist With Trolley,5Ton Electric Chain Hoist

Hebei Liston Lifting Rigging Manufacturing Co., Ltd. , https://www.liftingriggingfactory.com

Posted on