Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method for deeply removing cadmium from zinc sulfate for feed

A technology of zinc sulfate and zinc sulfate solution, applied in directions such as zinc sulfate, can solve the problem of high cost, and achieve the effects of low purchase cost, simple and stable operation, and easy raw materials

Inactive Publication Date: 2014-04-30
深圳安佑康牧科技有限公司
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zinc powder raw materials for cadmium removal have high requirements and high cost

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
  • Preparation method for deeply removing cadmium from zinc sulfate for feed

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] Please see attached figure 1 Shown, a kind of preparation method of zinc sulfate deepness removal cadmium for feed, described preparation method uses 500L reactor 1, the reaction pool 2 of 3000L, water jet vacuum pump 3, motor 4 and water pump 5, described motor 4 Set above the reactor 1, the reactor 1 is provided with a stirring paddle 6 connected to the motor 4, the reactor 1 is connected to the water jet vacuum pump 3 through a pipeline, Described water jet vacuum pump 3 is arranged on the top of described reaction tank 2, and described water jet vacuum pump 3 is connected with described water pump 5 through pipeline, and described water pump 5 is connected with described reaction tank 2 through pipeline. The bottom is connected, and the preparation method at least includes the following steps:

[0023] Step 1: The pH value of the zinc sulfate solution is adjusted to 2.5 by an acidity meter, and the zinc sulfate solution is added into the reaction tank 2, and the zi...

Embodiment 1

[0036] Take zinc sulfate solution, the temperature of the zinc sulfate solution is 30°C, add a small amount of sulfuric acid to adjust the pH value to 2.5. Carry out the cadmium removal reaction according to the above operation process, and the reaction pool 2 will have orange-yellow turbidity (cadmium sulfide). Continue to operate, and the reaction pool 2 will produce rotten egg smell (hydrogen sulfide). Stop the cadmium removal operation, release the zinc sulfate solution in the reaction tank 2 from the discharge port, and perform pressure filtration, take the filtered zinc sulfate solution and concentrate, and cool to obtain zinc sulfate crystals, check The cadmium content of this zinc sulfate crystal is 0.6ppm, which meets the expected requirement.

[0037] In summary, the present invention can effectively remove cadmium in zinc sulfate for feed, and it is most intuitive to control the pH of the solution to 2.5, and the effect is the best, and the separated cadmium does no...

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 discloses a preparation method for deeply removing cadmium from zinc sulfate for feed. The preparation method comprises the following steps: taking a zinc sulfate solution, and adding a small amount of sulfuric acid to regulate the pH value to be 2.5, wherein the temperature of the zinc sulfate solution is 30 DEGC; starting a water pump and a motor, adding sodium sulfide into a reaction kettle, adding dropwise sulfuric acid to generate cadmium sulfide in a reaction tank, and continuing performing operation to generate hydrogen sulfide in the reaction tank; stopping cadmium removal operation, discharging the zinc sulfate solution in the reaction tank from a discharge hole, performing pressure filtration, concentrating the zinc sulfate solution subjected to pressure filtration and cooling the concentrated zinc sulfate solution to obtain zinc sulfate crystals, and determining that the zinc sulfate crystals meet expected requirements when the cadmium content of the zinc sulfate crystals is detected to be 0.6 ppm. According to the preparation method, cadmium can be effectively removed from the zinc sulfate for the feed, and when the pH of the solution is controlled to be 2.5, the method is intuitive, good effects are achieved, and the separated cadmium is not resistant to a solvent.

Description

technical field [0001] The invention relates to a feed preparation method, in particular to a preparation method for deep cadmium removal with zinc sulfate for feed. Background technique [0002] Feed-grade zinc sulfate is a kind of feed additive, and the raw materials of zinc sulfate used in the production of feed generally contain cadmium. Cadmium is a highly toxic metal element that can cause enormous damage to the respiratory and reproductive systems of humans and animals, and can also damage kidneys and bones. Excessive cadmium can cause great harm to animals. The standard for feed grade zinc sulfate is that the cadmium content does not exceed 10ppm. [0003] The traditional method of removing cadmium is to adjust the pH of the zinc sulfate solution to 5, heat the solution to above 50°C, put in excess active zinc powder, and filter it while it is hot. If the operation speed is too slow, cadmium will be reversed. Zinc powder raw materials for cadmium removal have high ...

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
IPC IPC(8): C01G9/06
Inventor 林銮安邵海涛
Owner 深圳安佑康牧科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com