Feed-grade zinc oxide and preparation method thereof

Abstract

The invention relates to the field of feed-grade zinc oxide preparation, in particular to feed-grade zinc oxide and a preparation method thereof.The feed-grade zinc oxide with the content as high as 98% and the specific surface area as high as three hundred and above can be prepared by mixing granular flaky zinc oxide smashed to 200 meshes and activated zinc oxide; the contact probability of zinc oxide and intestinal microorganisms is remarkably improved, the growth delay time of the microorganisms is prolonged, and the prepared feed-grade zinc oxide is relatively good in flowability and beneficial to animal absorption; the preparation method disclosed by the invention is simple to operate, the granular flaky zinc oxide is firstly coarsely sieved to 60 meshes and then finely pulverized to 200 meshes by an ultrafine pulverizer, and then activated zinc oxide is added and stirred, so that the problem of poor flowability of zinc oxide by an indirect method is solved, and meanwhile, 200-mesh granular flaky zinc oxide and activated zinc oxide are stirred and mixed, so that the flowability of zinc oxide is improved. The method solves the dust problem of activated zinc oxide in the feed production process, and is suitable for large-scale industrial production.

Description

Technical Field

[0001] This invention relates to the field of feed-grade zinc oxide preparation, specifically a feed-grade zinc oxide and its preparation method. Background Technology

[0002] Feed-grade zinc oxide is characterized by its non-hygroscopic nature, fine texture, high zinc content, refined product quality, and easy absorption, resulting in high bioavailability. However, during its preparation, it was found that the indirect method resulted in poor zinc oxide flowability, hindering animal absorption and potentially causing poisoning. Furthermore, activated zinc oxide can easily cause dust pollution during feed production.

[0003] Therefore, there is an urgent need to find a new feed-grade zinc oxide and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a feed-grade zinc oxide and its preparation method. The method involves preparing feed-grade zinc oxide through granular and flake zinc oxide and active zinc oxide, resulting in zinc oxide with good flowability, which is beneficial for animal absorption. Using granular and flake zinc oxide as a raw material reduces raw material costs. Furthermore, the preparation method of this invention is simple to operate. The granular and flake zinc oxide is first passed through a coarse sieve to 60 mesh, then refined to 200 mesh using an ultra-fine pulverizer. Active zinc oxide is then added and stirred, solving the problem of poor flowability in indirect zinc oxide methods. Simultaneously, the mixing of 200-mesh granular and flake zinc oxide with active zinc oxide solves the dust problem associated with active zinc oxide during feed production, making it suitable for large-scale industrial production.

[0005] To solve the above-mentioned technical problems, the present invention provides a feed-grade zinc oxide, which is prepared by pulverizing 99.7% granular zinc oxide to 200 mesh and then mixing it with 95% active zinc oxide.

[0006] Preferably, feed-grade zinc oxide with a content of 98% is prepared by mixing granular and flake zinc oxide with active zinc oxide in a mass ratio of 6:4.

[0007] Preferably, feed-grade zinc oxide with a content of 98.5% is prepared by mixing granular and flake zinc oxide with active zinc oxide in a mass ratio of 7:3.

[0008] On the other hand, the present invention also provides a method for preparing feed-grade zinc oxide. The method for preparing the above-mentioned feed-grade zinc oxide includes passing 99.7% granular zinc oxide through a 60-mesh coarse sieve, then refining it to 200 mesh using an ultra-fine pulverizer, and then adding a certain amount of 95% active zinc oxide and stirring. After stirring and mixing evenly, feed-grade zinc oxide is obtained.

[0009] Preferably, the feed-grade zinc oxide has a specific surface area of ​​up to 300 m² / g or more.

[0010] Preferably, the mass ratio of granular zinc oxide with a content of 99.7% to active zinc oxide with a content of 95% is 6:4.

[0011] Preferably, the mass ratio of granular zinc oxide with a content of 99.7% to active zinc oxide with a content of 95% is 7:3.

[0012] The beneficial effects of this invention are: This invention utilizes a mixture of granular zinc oxide (crushed to 200 mesh) and active zinc oxide to prepare feed-grade zinc oxide with a content as high as 98% and a specific surface area of ​​300 or more. This significantly increases the contact probability between zinc oxide and intestinal microorganisms, prolongs the lag time of microbial growth, and produces feed-grade zinc oxide with good flowability, which is beneficial for animal absorption. Furthermore, the market price of granular zinc oxide is lower than that of active zinc oxide. By selecting a mass ratio of granular zinc oxide to active zinc oxide of 6:4 or 7:3 for preparation, feed preparation costs can be reduced. Moreover, the preparation method of the present invention is simple to operate. By first passing the granular and flaky zinc oxide through a coarse sieve to 60 mesh, and then refining it to 200 mesh through an ultra-fine pulverizer, and then adding active zinc oxide and stirring, the problem of poor fluidity of zinc oxide in the indirect method is solved. At the same time, the 200-mesh granular and flaky zinc oxide is mixed with active zinc oxide, which solves the dust problem of active zinc oxide in the feed production process, making it suitable for large-scale industrial production. This invention can produce feed-grade zinc oxide with a content of 98% or higher from granular and flake zinc oxide with a content of 99.7% and active zinc oxide with a content of 95%, which is higher than the national standard. Detailed Implementation

[0013] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] A feed-grade zinc oxide is prepared by pulverizing 99.7% pure granular zinc oxide to 200 mesh and then mixing it with 95% pure active zinc oxide.

[0015] On the other hand, the present invention provides a method for preparing feed-grade zinc oxide. The method includes passing 99.7% pure granular zinc oxide through a 60-mesh coarse sieve, then refining it to 200 mesh using an ultra-fine pulverizer, and then adding a certain amount of 95% pure active zinc oxide and stirring until the mixture is homogeneous to obtain feed-grade zinc oxide. The specific surface area of ​​the feed-grade zinc oxide is as high as 300 m² / g or more. Example

[0016] Feed-grade zinc oxide was prepared using the above method. Granular and flaky zinc oxide with a content of 99.7% was first passed through a coarse powder sieve of 60 mesh, and then refined into 200 mesh using an ultra-fine pulverizer. A certain amount of active zinc oxide with a content of 95% was then added and stirred until it was evenly mixed to obtain feed-grade zinc oxide.

[0017] In Example 1, the mass ratio of granular zinc oxide to active zinc oxide is 7:3, resulting in feed-grade zinc oxide with a content of 98.5% and a specific surface area of ​​300 m² / g. Example

[0018] Unlike Example 1, the mass ratio of granular zinc oxide to active zinc oxide is 6:4, resulting in feed-grade zinc oxide with a content of 98% and a specific surface area of ​​320 m² / g. Example

[0019] Unlike Example 1, the mass ratio of granular zinc oxide to active zinc oxide is 5:5, resulting in feed-grade zinc oxide with a content of 97.5% and a specific surface area of ​​350 m² / g.

[0020] Based on the above three sets of experimental data, the optimal mass ratio of granular zinc oxide to active zinc oxide is 6:4 or 7:3, which can meet the requirement of 98% content while achieving a specific surface area of ​​300m² / g. Of course, feed-grade zinc oxide that meets the requirements can also be formulated according to specific needs, and specific examples will not be listed here.

[0021] This invention utilizes the mixing of granular and flake zinc oxide and active zinc oxide to prepare feed-grade zinc oxide with a content as high as 98% and a specific surface area of ​​300 or more. This significantly increases the contact probability between zinc oxide and intestinal microorganisms, prolongs the lag time of microbial growth, and the prepared feed-grade zinc oxide has good flowability, which is conducive to animal absorption. Moreover, the market price of granular and flake zinc oxide is lower than that of active zinc oxide. By selecting a mass ratio of granular and flake zinc oxide to active zinc oxide of 6:4 or 7:3 for preparation, the feed preparation cost can be reduced. Moreover, the preparation method of the present invention is simple to operate. By first passing the granular and flaky zinc oxide through a coarse sieve to 60 mesh, and then refining it to 200 mesh through an ultra-fine pulverizer, and then adding active zinc oxide and stirring, the problem of poor fluidity of zinc oxide in the indirect method is solved. At the same time, the 200-mesh granular and flaky zinc oxide is mixed with active zinc oxide, which solves the dust problem of active zinc oxide in the feed production process, making it suitable for large-scale industrial production. This invention can produce feed-grade zinc oxide with a content of 98% or higher from granular and flake zinc oxide with a content of 99.7% and active zinc oxide with a content of 95%, which is higher than the national standard.

[0022] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A feed grade zinc oxide, characterized in that, The granular flaky zinc oxide with content of 99.7% is crushed to 200 mesh and mixed with active zinc oxide with content of 95% to prepare.

2. A feed grade zinc oxide according to claim 1, characterized in that, The granular flaky zinc oxide and the active zinc oxide are mixed in a mass ratio of 6:4 to prepare feed-grade zinc oxide with content of 98%.

3. A feed grade zinc oxide according to claim 1, characterized in that, The granular flaky zinc oxide and the active zinc oxide are mixed in a mass ratio of 7:3 to prepare feed-grade zinc oxide with content of 98.5%.

4. A process for the production of feed grade zinc oxide, for the production of feed grade zinc oxide according to any one of claims 1 to 3, characterized in that, The preparation method comprises the following steps: firstly, the granular flaky zinc oxide with content of 99.7% is crushed to 60 mesh by a coarse powder primary sieve, and then is finely crushed to 200 mesh by a super micro pulverizer; secondly, a certain amount of active zinc oxide with content of 95% is added and stirred; and finally, the feed-grade zinc oxide is obtained after the stirring and mixing are completed.

5. The method for preparing feed-grade zinc oxide according to claim 4, characterized in that, The specific surface area of the feed-grade zinc oxide is up to 300 m² / g or above.

6. The method for preparing feed-grade zinc oxide according to claim 4, characterized in that, The mass ratio of the granular flaky zinc oxide with content of 99.7% to the active zinc oxide with content of 95% is 6:

4.

7. The method for preparing feed-grade zinc oxide according to claim 4, characterized in that, The mass ratio of the granular flaky zinc oxide with content of 99.7% to the active zinc oxide with content of 95% is 7:3.