Copper electrowinning processes produce slags Cd Cd metal as shown in FIG.
Fig.1 Process flow of metal cadmium electrowinning method from copper cadmium slag
The composition of copper cadmium slag generally ranges from 2.5% to 12% Cd, 35% to 60% Zn, 4% to 17% Cu, and 0.05% to 2.0% Fe. Copper cadmium slag also contains a small amount of As, Sb, SiO 2 , Co, Ni, T1, In and other impurities.
In order to accelerate the leaching process, some factories oxidize copper cadmium slag in the air before leaching. This also increases the loss of copper dissolution, which is only applicable when dealing with copper-cadmium slag with lower copper content. The copper slag composition obtained by the leaching process is: 30% to 50% Cu, 10% to 15% Zn, and 0.3% to 1.0% Cd.
In the leaching, in addition to the dissolution of zinc and copper, some Ni, Co, In, T1 enter the solution, and the obtained leaching liquid composition is: 120-130 g/L Zn, 8-16 g/LCd, 0.3-0.8 g/LCu, 3 to 9 g/LFe, 0.05 to 0.1 g/LCo, 0.05 to 0.1 g/L Ni. After the leachate is purified by adding zinc powder to remove copper, the zinc powder is sent to replace the precipitated cadmium. Displacement of precipitated cadmium is generally carried out in two stages. In the first stage, the temperature was maintained at 333 K to reduce the cadmium in the solution to 1 g/L. The second step of the solution after separating the copper cadmium slag by filtration can further reduce the cadmium content to 10-15 mg/L. The sponge cadmium (II) obtained in the second stage contains low cadmium and reverses the leaching process of copper cadmium slag. The solution after the second stage replacement contains Co, T1, In, etc., and the cobalt is removed by the xanthate to further recover T1 and In.
The sponge (I) obtained by replacing the precipitated cadmium in the first stage is leached with a cadmium electrolyte. The concentration of sulfuric acid in the solution is 200-250 g/L, the leaching temperature is 353-363 K, and MnO 2 or KMnO 4 is added to accelerate the dissolution of the cadmium sponge. The pH value of the leaching is 4.8-5.2, and the copper is hydrolyzed into the slag.
The cadmium cotton leaching solution after separating the copper slag, adding SrCO 3 to remove lead , adding zinc powder to replace copper, adding KMnO 4 to oxidize T1 and Fe, and then hydrolyzing and precipitating.
The electrowinning of cadmium solution generally adopts the system of non-circulating operation of electrolyte, and its operating conditions and technical indicators:
Add electrolyte component / (g · L -1 ) 160 ~ 220Cd, 20 ~ 30Zn, 12 ~ 15H 2 SO 4
Waste liquid component after electrowinning / (g·L -1 ) 15～20Cd, 150～180H 2 SO 4
Electrolyte temperature / K 303 ~ 308
Current efficiency /% 70 ~ 92
Cell voltage / V 2.5 ~ 2.6
Dielectric cycle / h 24
Power consumption / (kW·h·t -1 ) 1400～1700
Higher current efficiency can be obtained by using the electrolyte circulation production method.
Grab Bucket Description
It is widely used to catch scrap metal,waste iron, ores, pig iron,sand,rubbish etc,and can be equipped on various cranes like Overhead Crane,gantry cranes,portal cranes
Mechanical Grab Bucket (Available in One, Two and Four Rope execution)
Scissor type grab bucket for bulk carrier loading and unloading:
ï‚·Suitable for port, storage yard application
ï‚·Design for coal, Mineral powder, Bulk chemical fertilizer handling
ï‚·High grab proportion can reach 1:1.5
Grab for wood handling
ï‚·Suitable for port, forestry centre, lumber storage yard application
ï‚·Design for wood handling
Manual operate one rope grab bucket
ï‚·Suitable for port, storage yard application
ï‚·Design coal, Mineral powder, Bulk chemical fertilizer handling
ï‚·Simple structure, unique connect structure design, easy and Convenient operation, high precision movement.
Grab bucket for Marine salvage
ï‚·Design for salvaging huge sunken ship under water
ï‚·Could separate the ship very easy under water and can finish the work with a high efficiency.
Marine salvage Orange Peel Grab Bucket
ï‚·Design for salvaging huge sunken ship under water
Could separate the ship very easy under water and can finish the work with a high efficiency.
Grab bucket for bulk material rope type
Suitable for port, hydropower plant, metallurgical , construction, and storage yard application
Design for coal, Mineral powder, Bulk chemical fertilizer, or other bulk material handling.
Leakproof rope type grab bucket
Suitable for port, hydropower plant, metallurgical, and storage yard application
Orange peel bulk material grab
ï‚·Suitable for port, hydropower plant, mining, construction, waste dump metallurgical, and storage yard application.
ï‚·Design for Pig iron, ore, slag or other bulk material handling.
Hydraulic Grab Bucket (Electro Hydraulic / Motorized)
Electric-hydraulic clamshell grab bucket
ï‚·Grab with hydraulic system, and all hydraulic unit adapt famous high quality brand in the world to make sure the high performance.
Electric Hydraulic orange peel grab bucket
ï‚·Grab with hydraulic system, and all hydraulic unit adapt famous high quality brand in the world to make sure the high performance.Every tine have a independent oil cylinder driven to make sure the material sift-proof.
Electric hydraulic rectangle type grab bucket
ï‚·Grab with hydraulic system, and all hydraulic unit adapt famous high quality brand in the world.
ï‚·Design for cleaning Garbage and debris in Reservoir, river, boxcar train.
Excavator Grab bucket
ï‚·Adapt the hydraulic system of Excavator to control the grab open, close and rotation.
ï‚·Design for Soil, sand, slag and other bulk material and construction waste handling in Construction yard.
How to choose
-which type do you want
The Arm width, pin size and pin center to center of the grab bucket
Grab Bucket
Grab Bucket,Hydraulic Grab Bucket,Orange Peel Grab Bucket,Wire Rope Grab Bucket
Jiangxi Mide Industrial Co., Ltd. , https://www.midecrane.com