Unlock instant, AI-driven research and patent intelligence for your innovation.
Oxidative pressure acid leaching method for processing purified waste residue in zinc hydrometallurgy process
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A hydrometallurgy and oxygen pressure acid leaching technology is applied in the fields of dissolving electronic waste containing heavy metals, dissolving and recovering copper-cadmium slag, nickel-cobalt slag and heavy metal smelting waste slag produced in zinc hydrometallurgy
Active Publication Date: 2011-04-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF2 Cites 2 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0005] In terms of zinc replacement slag treatment, there are many domestic reports. Generally, direct acid leaching is adopted, and selective leaching is carried out by controlling the acidity. During the leaching process, severe Toxic arsine gas, there is a patent that uses the method of adding an oxidant to enhance leaching (Chinese patent, application number 99115282.4), but it is necessary to add a strong oxidant sodiumpersulfate during the operation, which increases the operation steps, the process is longer, and the cobalt recovery rate is low.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0028] Example 1: Copper-cadmium slag produced in zinc hydrometallurgical purification process, containing 10% copper, 15% cadmium, 20% zinc, 0.1% cobalt, and 6% iron.
[0029] Crush the massive slag, grind it to -100 mesh, add water to adjust the slurry, put it into a 2L titanium-lined autoclave, add 300g / L sulfuric acid, and seal it; introduce industrial oxygen until the gauge pressure is 0.4MPa, stir and heat up to 120°C, and keep warm React for 120min.
[0030] The leaching rates of copper, zinc and cadmium are all over 99.5%, the residual copper content in the slag is less than 0.2%, and the iron content in the leaching solution is less than 0.1g / L. It is possible to directly separate and extract valuable metals without iron removal.
Embodiment 2
[0031] Example 2: The nickel-cobalt slag produced in the hydrometallurgical purification process contains 40% zinc, 0.1% cadmium and cobalt, and 6% iron.
[0032] Crush the slag, grind it to -100 mesh, add water to adjust the slurry, put it into a 2L titanium-lined autoclave, add 300g / L sulfuric acid, and seal it; introduce industrial oxygen to a gauge pressure of 0.4MPa, stir and heat up to 120°C, and keep warm for reaction 120min.
[0033] The leaching rates of zinc, cadmium and cobalt are all over 99.9%, the total content of residual zinc, cadmium and cobalt heavy metals in the slag is less than 0.1%, and the iron content in the leaching solution is less than 0.1g / L. It is possible to directly separate and extract valuable metals without iron removal.
Embodiment 3
[0034] Example 3: Copper-cadmium slag produced in zinc hydrometallurgical purification process, containing 11% copper, 12% cadmium, 26% zinc and 7% iron.
[0035] Crush the massive slag, grind it to -100 mesh, add water to adjust the slurry, put it into a 2L titanium-lined autoclave, add 300g / L sulfuric acid, and seal it; introduce industrial oxygen until the gauge pressure is 0.2MPa, stir and heat up to 130°C, and keep warm React for 150min. The leaching rates of copper, zinc and cadmium are all above 99.5%, the residual copper content in the slag is less than 0.1%, and the iron content in the leaching solution is less than 0.1g / L.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The invention relates to an oxidative pressure acid leaching method for processing the purified waste residue generated in the zinchydrometallurgy process. The method comprises the following steps: the copper-cadmium residue generated during the copper-cadmium removal and the nickel-cobalt residue generated during the nickel-cobalt removal is replaced, i.e., the waste residue from the purification of zinc is leached with sulfuric acid in an acid-resistant high pressureautoclave under the condition that the high-pressure oxygen is introduced in. Compared with the commonly-used direct acid solution method, the method has the advantages of high leaching rate, high processing speed, no poisonous and harmful gas and iron removal during the leaching process, and the like, can obviously improve the prior process conditions, reduce the pollution and the production cost and also provides a new method for processing the other waste residues containing heavy metal.
Description
technical field [0001] The invention relates to oxygen pressure acid leaching for dissolving heavy metals in purified slag produced in zinchydrometallurgy, and is especially suitable for dissolving and recovering copper-cadmiumslag and nickel-cobaltslag produced in zinc hydrometallurgy, and can also be used for dissolving heavy metal-containing slag Electronic waste and other heavy metalsmelting waste. Background technique [0002] The zinc hydrometallurgy process is mainly composed of several steps such as mineral roasting to produce calcined sand, sulfuric acid leaching of calcined sand, and electrowinning of leaching solution to produce metal zinc. Since the zinc sulfide ore used is often associated with other metals such as copper, cadmium, and cobalt etc. Therefore, the leaching solution also contains these impurity ions in addition to zinc. In order to ensure the smooth progress of the electrowinning process of metal zinc in the future, it is necessary to remove im...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More