Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for improving vacuum distillation separation efficiency of high-cadmium zinc

A technology of distillation separation and vacuum, applied in the direction of improving process efficiency, etc., can solve the problems of complex processing methods, high production costs, and separation efficiency not reaching the maximum value, and achieve the effects of saving investment, improving efficiency, and reducing procedures

Active Publication Date: 2015-01-07
KUNMING UNIV OF SCI & TECH
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned prior art, the separation efficiency of zinc and cadmium with high cadmium and zinc has not reached the maximum value, or the products that produce cadmium meet the requirements, but the processing method is relatively complicated, and the production cost is relatively high.

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
  • Method for improving vacuum distillation separation efficiency of high-cadmium zinc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] like figure 1 Shown, this method that improves high cadmium zinc vacuum distillation separation efficiency, its concrete steps are as follows:

[0018] Step 1, first-level vacuum distillation: first, add high-cadmium zinc into aluminum inhibitor according to the mass ratio of 1:0.1 and mix evenly to obtain high-cadmium-zinc mixture material, in which high-cadmium zinc contains Zn70wt.%, Cd30wt.%;

[0019] Step 2. Put the high-cadmium-zinc mixed material obtained in step 1 in a vacuum furnace, and vacuum distill for 1 hour under the conditions of controlling the residual pressure in the furnace to be 5 Pa and the distillation temperature to be 380° C. to obtain volatile zinc and cadmium and residues;

[0020] Step 3, two-stage vacuum distillation: add zinc and cadmium obtained in step 2 according to the mass ratio of 1:0.05, add aluminum inhibitor and mix evenly to obtain a zinc-cadmium mixture;

[0021] Step 4. Put the zinc-cadmium mixture material obtained in step 3 i...

Embodiment 2

[0025] like figure 1 Shown, this method that improves high cadmium zinc vacuum distillation separation efficiency, its concrete steps are as follows:

[0026] Step 1, first-level vacuum distillation: first, add high-cadmium zinc into aluminum inhibitor according to the mass ratio of 1:0.05 and mix evenly to obtain high-cadmium-zinc mixture material, in which high-cadmium zinc contains Zn80wt.% and Cd20wt.%.

[0027] Step 2. Place the high-cadmium-zinc mixture material obtained in step 1 in a vacuum furnace, and vacuum distill for 0.5 h under the conditions of controlling the residual pressure in the furnace to 4 Pa ​​and the distillation temperature to 420° C. to obtain volatile zinc cadmium and residues;

[0028] Step 3, two-stage vacuum distillation: add zinc and cadmium obtained in step 2 according to the mass ratio of 1:0.1, add aluminum inhibitor and mix evenly to obtain a zinc-cadmium mixture;

[0029] Step 4. Put the zinc-cadmium mixture material obtained in step 3 in ...

Embodiment 3

[0033] like figure 1 Shown, this method that improves high cadmium zinc vacuum distillation separation efficiency, its concrete steps are as follows:

[0034] Step 1. First-level vacuum distillation: first, add high-cadmium zinc into aluminum inhibitor according to the mass ratio of 1:0.02 and mix evenly to obtain high-cadmium-zinc mixture material, in which high-cadmium zinc contains Zn75wt.%, Cd25wt.%;

[0035] Step 2. Put the high-cadmium-zinc mixed material obtained in step 1 in a vacuum furnace, and vacuum distill for 0.8h under the conditions of controlling the residual pressure in the furnace to be 20Pa and the distillation temperature to be 400°C to obtain volatile zinc and cadmium and residues;

[0036] Step 3, two-stage vacuum distillation: add zinc and cadmium obtained in step 2 according to the mass ratio of 1:0.02, add aluminum inhibitor and mix evenly to obtain a zinc-cadmium mixture;

[0037] Step 4. Put the zinc-cadmium mixture obtained in step 3 in a vacuum f...

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

No PUM Login to View More

Abstract

The invention relates to a method for improving vacuum distillation separation efficiency of high-cadmium zinc, and belongs to the technical field of nonferrous metal smelting. The method comprises the following steps: primary vacuum distillation, namely firstly uniformly mixing high-cadmium zinc with an aluminum inhibitor to obtain a high-cadmium zinc material mixture, putting the obtained high-cadmium zinc material mixture in a vacuum furnace and performing vacuum distillation for 0.5-1 hour to obtain volatile matters zinc cadmium and residues; secondary vacuum distillation, namely uniformly mixing the obtained zinc cadmium with the aluminum inhibitor to obtain a zinc cadmium material mixture, putting the obtained zinc cadmium material mixture into a vacuum furnace and performing vacuum distillation for 1-2 hours to obtain the volatile matter cadmium product and residues. Compared with the prior art, the method has the advantages that the content of cadmium in the crude cadmium is over 98wt%, the direct yield of cadmium is over 92% and the total recovery rate of the metals is over 99% by adding metal aluminum in vacuum distillation separation processes of high-cadmium zinc, the efficiency of separating zinc cadmium by vacuum distillation is improved, the distillation processes are reduced, the investment is saved and the separation of high-cadmium zinc is realized.

Description

technical field [0001] The invention relates to a method for improving the separation efficiency of high-cadmium-zinc vacuum distillation, which belongs to the technical field of nonferrous metal smelting. Background technique [0002] The average content of zinc in the earth's crust is 0.2%, and no natural zinc is found in nature. A variety of zinc-containing minerals have been found in nature, which are mainly divided into two categories: sulfide ore and oxide ore. In sulfide ore, zinc is ZnS or nZnS. mFeS state, the most is ZnS state. In addition to the paragenesis of lead and zinc minerals in the ore, there are mainly copper, iron, cadmium, tin, lead, sulfur, barite, fluorite and so on. [0003] Zinc smelting methods are divided into two categories: fire method and wet method. During the zinc hydrometallurgy process, cadmium and zinc enter the leaching solution together. In the purification stage, zinc powder is used to remove cadmium, so as to realize the separation ...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/16C22B17/02C22B19/04
CPCY02P10/20
Inventor 邓勇杨斌徐宝强刘大春郁青春熊恒王飞闫华龙杨子权
Owner KUNMING UNIV OF SCI & TECH