CN115316508A - Feed additive containing silicon dioxide and preparation method thereof - Google Patents
Feed additive containing silicon dioxide and preparation method thereof Download PDFInfo
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- CN115316508A CN115316508A CN202211250603.8A CN202211250603A CN115316508A CN 115316508 A CN115316508 A CN 115316508A CN 202211250603 A CN202211250603 A CN 202211250603A CN 115316508 A CN115316508 A CN 115316508A
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/20—Inorganic substances, e.g. oligoelements
- A23K20/28—Silicates, e.g. perlites, zeolites or bentonites
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Abstract
The invention provides a feed additive containing silicon dioxide and a preparation method thereof, and the preparation method comprises the following steps: mixing and grinding tailing slurry of iron ore with water and acid liquor to obtain final slurry, and centrifuging the final slurry to obtain solid matters; adding water into the solid substances, stirring and centrifuging again; and (3) repeating the steps of adding water, stirring and centrifuging for 6-20 times in the step (2) until the pH value of the liquid obtained after centrifuging is more than 6.5, and drying and sieving the obtained final solid substance to obtain the feed additive containing silicon dioxide. The preparation method of the feed additive containing silicon dioxide, disclosed by the invention, prepares the silicon dioxide serving as the feed additive by using the tailing waste, so that the effects of saving energy, reducing emission, treating waste and reducing pollution can be achieved, and the total yield can reach more than 45%.
Description
Technical Field
The invention belongs to the field of recycling of mineral waste, and particularly relates to a feed additive containing silicon dioxide and a preparation method thereof.
Background
The feed is used as a necessary material for the production of the breeding industry and is continuously developed. The variety is very rich from the most original natural vegetation, to the artificially planted pasture and grain, and to the current mineral feed, from single component to compound feed. The feed can basically reach 50-70% of the cost of the breeding industry, so that the quality and the price of the feed play a significant role in the development of the breeding industry.
The silicon dioxide is used as a feed additive, can prevent feed from caking, plays a role in flow aid, and is also a carrier for dispersing various trace element additives. The existing feed additive silicon dioxide is mainly prepared by taking quartz sand as a raw material through a series of steps such as high-temperature calcination and the like. On one hand, the natural sandstone needs to be mined as a raw material, which causes certain damage to the environment, and on the other hand, the method also needs great energy consumption, increases carbon emission and has higher cost.
Disclosure of Invention
In view of this, the present invention provides a feed additive containing silicon dioxide and a preparation method thereof, which aims to overcome the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a preparation method of a feed additive containing silicon dioxide comprises the following steps:
mixing and grinding tailing slurry of iron ore with water and acid liquor to obtain final slurry, and centrifuging the final slurry to obtain solid matters;
adding water into the solid substances, stirring and centrifuging again;
and (3) repeating the steps of adding water, stirring and centrifuging for 6-20 times in the step (2) until the pH value of the liquid obtained after centrifuging is more than 6.5, and drying and sieving the obtained final solid substance to obtain the feed additive containing silicon dioxide.
Further, the mass ratio of the tailing mud to the water to the acid liquor in the step (1) is 100:40-60:90-120. The water content of the mixed mixture is 45-55% by adding water.
Further, the tailing slurry in the step (1) is muddy solid waste which is extracted by flotation and/or magnetic separation and then pressed; the water content of the tailing slurry is 22-28%, the content of ferric oxide is 15-18%, the content of impurities containing non-silicon elements is 1-2%, and the balance is silicon dioxide.
Further, the pH value of the final slurry in the step (1) is less than or equal to 2.5.
Further, the acid solution in the step (1) is hydrochloric acid and/or sulfuric acid; the concentration of the hydrochloric acid is 35 percent; the concentration of the sulfuric acid is 98%.
Preferably, the acid solution in step (1) is hydrochloric acid and sulfuric acid, and the volume ratio of hydrochloric acid to sulfuric acid is 90-120. The amount of hydrochloric acid added was 3.5 times the iron content. The hydrochloric acid dissolves the metal compounds in the tailing slurry to remove the metal compounds.
Further, in the step (1), a sand shaking table is used for grinding, and the inner bottom of the sand shaking table is filled with carborundum of 400-1000 meshes; the time for grinding the screen is 1-10 hours.
Preferably, the time of the grinding step in the step (1) is 2 hours. The sand table polishes other mineral impurities adhered to the silicon dioxide, so that the silicon dioxide is better dissolved by acid.
Further, the time of the mixing step in the step (1) is 1-10 hours; the rotation speed of the centrifugation step in the step (1) is 2000-8000 rpm, and the time is 0.5-20 minutes.
Preferably, the mixing step in the step (1) is carried out for 2 hours.
Preferably, the rotation speed of the centrifugation step in the step (1) is 6000 rpm, and the time is 2 minutes. And (3) centrifugally separating out liquid substances, namely layering turbid water liquid containing impurities such as silica, iron and the like which are not dissolved in water under the action of centrifugal force, and pouring out the liquid to only retain the solid substances which are not dissolved in water.
Further, the rotation speed of the centrifugation step in the step (2) is 2000-8000 rpm, and the time is 0.5-20 minutes; the water adding amount in the water adding step in the step (2) is the amount of the liquid obtained after the last centrifugation; the stirring step in the step (2) is carried out for 30 minutes. And repeatedly adding water for washing and performing centrifugal separation until the pH value is not lower than 6.5, namely continuously and repeatedly adding water for washing, performing centrifugal separation and pouring out a liquid part to retain solid insoluble substances, and stopping when the pH value of the liquid is not lower than 6.5 after the liquid part is washed by adding water, and not performing centrifugal separation.
Preferably, the rotation speed of the centrifugation step in the step (2) is 6000 rpm, and the time is 2 minutes.
Further, the drying step in the step (3) is drying by using a cyclone separator; the temperature of the drying step in the step (3) is more than or equal to 100 ℃; the screen mesh size of the screening step in the step (3) is 600 microns.
Preferably, the temperature of the drying step in the step (3) is 125-130 ℃.
A feed additive containing silicon dioxide, which is prepared by the method.
Compared with the prior art, the invention has the following advantages:
the preparation method of the feed additive containing silicon dioxide, disclosed by the invention, prepares the silicon dioxide serving as the feed additive by using the tailing waste, so that the effects of saving energy, reducing emission, treating waste and reducing pollution can be achieved, and the total yield can reach more than 45%.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are all conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1
A preparation method of a feed additive containing silicon dioxide comprises the following steps:
adding 100 parts of hematite tailing slurry containing 25 percent of water, 16 percent of ferric oxide, 50 parts of water, 90 parts of 35 percent hydrochloric acid and 2 parts of 98 percent sulfuric acid in sequence, mixing for 2 hours, then using a sand table to grind and sieve for 2 hours, centrifuging, separating liquid, adding 50 parts of water into solid substances, stirring for 30 minutes, then centrifuging for 2 minutes at 6000 rpm, repeatedly adding water, stirring and centrifuging for 6-8 times, wherein the pH value of the centrifugally separated water is higher than 6.5, feeding the slurry into a cyclone separator to obtain dry powder silicon dioxide particles, sieving the particles, and collecting components below 600 micrometers. The total yield thereof was found to be 55%.
Example 2
A preparation method of a feed additive containing silicon dioxide comprises the following steps:
100 parts of hematite tailing slurry containing 22 percent of water, 16 percent of ferric oxide, 60 parts of water, 90 parts of 35 percent hydrochloric acid and 2 parts of 98 percent sulfuric acid are added and mixed in sequence for 2 hours, then a sand table is used for grinding and screening for 2 hours and then centrifuging is carried out, after liquid is separated out, 60 parts of water is added into solid matters, the solid matters are stirred for 30 minutes and then centrifuged for 2 minutes at 6000 rpm, water is added repeatedly, the stirring and the centrifuging are carried out for 6 to 8 times, the pH value of the water after the centrifugal separation is higher than 6.5, the slurry at the moment is sent into a cyclone separator to obtain dry powder silicon dioxide particles, the particles are sieved, and the components below 600 micrometers are collected to obtain the hematite tailing slurry. The total yield was 52%.
Example 3
A preparation method of a feed additive containing silicon dioxide comprises the following steps:
adding 100 parts of hematite tailing slurry containing 28 percent of water, 20 percent of ferric oxide, 50 parts of water, 115 parts of 35 percent hydrochloric acid and 3 parts of 98 percent sulfuric acid in sequence, mixing for 2 hours, then using a sand table to grind and sieve for 2 hours, centrifuging, separating liquid, adding 50 parts of water into solid substances, stirring for 30 minutes, then centrifuging for 2 minutes at 6000 rpm, repeatedly adding water, stirring and centrifuging for 6-8 times, wherein the pH value of the centrifugally separated water is higher than 6.5, feeding the slurry into a cyclone separator to obtain dry powder silicon dioxide particles, sieving the particles, and collecting components below 600 micrometers. The total yield was 52%.
Example 4
A preparation method of a feed additive containing silicon dioxide comprises the following steps:
adding 100 parts of hematite tailing slurry containing 28 percent of water, 18 percent of ferric oxide, 50 parts of water, 100 parts of 35 percent hydrochloric acid and 2.5 parts of 98 percent sulfuric acid in sequence, mixing for 2 hours, then using a sand table to grind and sieve for 2 hours, centrifuging, separating liquid, adding 50 parts of water into solid substances, stirring for 30 minutes, then centrifuging for 2 minutes at 6000 rpm, repeatedly adding water, stirring and centrifuging for 6-8 times, wherein the pH value of the centrifugally separated water is higher than 6.5, sending the slurry into a cyclone separator to obtain dry powder silicon dioxide particles, sieving the particles, and collecting components below 600 micrometers. The total yield is 48%.
Comparative example 1
Compared with example 1, the only difference is that: the sand shaking table is changed into a ball mill.
The prepared product has obviously over-high fineness and increased viscosity, so that the product cannot play a role in dispersion.
Comparative example 2
Compared with example 1, the difference is only that: 45 parts of 35% hydrochloric acid and 1 part of 98% sulfuric acid.
The prepared product has obvious reddish color, which indicates that the ferric oxide is not removed sufficiently.
Comparative example 3
A preparation method of a feed additive containing silicon dioxide comprises the following steps:
adding and mixing 100 parts of hematite tailing slurry containing 28% of water, 18% of ferric oxide, 50 parts of water, 100 parts of 35% hydrochloric acid and 2.5 parts of 98% sulfuric acid in sequence for 2 hours, then using a sand table to carry out grinding for 2 hours, sending the slurry into a cyclone separator to obtain dry powder silica particles, sieving the particles, and collecting components below 600 microns.
The prepared product is obviously seriously caked in the drying process, the screen allowance is larger, and the total yield is less than 30 percent.
The product obtained in each example and a commercially available silicon dioxide additive are respectively and uniformly mixed with commercially available milk powder, the mixture is filled in a smooth seamless steel pipe with the inner diameter of 50 mm, the filling height is 20 mm, a piston capable of freely moving is placed on the mixture, a load of 3.0 kg is loaded, the load is removed after a period of time, and the pressure-bearing time that a sample can naturally flow out and does not cake is recorded. The pressure bearing time of the product obtained in each example with a commercially available silica additive is shown in table 1.
TABLE 1 bearing time results
As is clear from Table 1, when the amount of the additive is 0.2% or more, examples 1 to 4 have a better dispersing effect than a commercially available product and can prevent the adhesion of the feed for a longer period of time.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A preparation method of a feed additive containing silicon dioxide is characterized by comprising the following steps: the method comprises the following steps:
mixing and grinding tailing slurry of iron ore with water and acid liquor to obtain final slurry, and centrifuging the final slurry to obtain solid matter;
adding water into the solid substance, stirring, and centrifuging again;
and (3) repeating the steps of adding water, stirring and centrifuging in the step (2) for 6-20 times until the pH value of the liquid obtained after centrifuging is greater than 6.5, and drying and sieving the obtained final solid substance to obtain the feed additive containing silicon dioxide.
2. The method for preparing a silica-containing feed additive according to claim 1, wherein: the mass ratio of the tailing mud to the water to the acid liquor in the step (1) is 100:40-60:90-120.
3. The method for preparing a silica-containing feed additive according to claim 1, wherein: the tailing slurry in the step (1) is extracted through flotation and/or magnetic separation, and then pressed into mud-shaped solid waste; the water content of the tailing slurry is 22-28%, the content of ferric oxide is 15-18%, the content of impurities containing non-silicon elements is 1-2%, and the balance is silicon dioxide.
4. The method for preparing a silica-containing feed additive according to claim 1, wherein: the pH value of the final slurry in the step (1) is less than or equal to 2.5.
5. The method for preparing a silica-containing feed additive according to claim 1, wherein: the acid solution in the step (1) is hydrochloric acid and/or sulfuric acid; the concentration of the hydrochloric acid is 35 percent; the concentration of the sulfuric acid is 98%.
6. The method for preparing a silica-containing feed additive according to claim 1, wherein: in the step (1), a sand shaking table is used for grinding, and the inner bottom of the sand shaking table is filled with carborundum of 400-1000 meshes; the time for grinding the screen is 1-10 hours.
7. The method for preparing a silica-containing feed additive according to claim 1, wherein: the time of the mixing step in the step (1) is 1-10 hours; the rotation speed of the centrifugation step in the step (1) is 2000-8000 rpm, and the time is 0.5-20 minutes.
8. The method for preparing a silica-containing feed additive according to claim 1, wherein: the rotation speed of the centrifugation step in the step (2) is 2000-8000 rpm, and the time is 0.5-20 minutes; the water adding amount in the water adding step in the step (2) is the amount of the liquid obtained after the last centrifugation; the stirring step in the step (2) is carried out for 30 minutes.
9. The method for preparing a silica-containing feed additive according to claim 1, wherein: the drying step in the step (3) is implemented by using a cyclone separator; the temperature of the drying step in the step (3) is more than or equal to 100 ℃; the screen mesh size of the screening step in the step (3) is 600 microns.
10. A feed additive containing silica, characterized in that: the feed additive is made by the method of any one of claims 1-9.
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| CN202211250603.8A CN115316508A (en) | 2022-10-13 | 2022-10-13 | Feed additive containing silicon dioxide and preparation method thereof |
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| CN202211250603.8A CN115316508A (en) | 2022-10-13 | 2022-10-13 | Feed additive containing silicon dioxide and preparation method thereof |
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| GB1519369A (en) * | 1975-08-22 | 1978-07-26 | Kemmlitz Silikatrohstoff | Process for the production of sio2 |
| US20020102198A1 (en) * | 2000-11-25 | 2002-08-01 | Degussa Ag | High-structure precipitated silicas |
| US20060051279A1 (en) * | 2002-11-27 | 2006-03-09 | Gudmundur Gunnarsson | Process for production of silica from olivine |
| CN1956923A (en) * | 2004-01-14 | 2007-05-02 | Cod技术股份公司 | Process for production of precipitated silica from olivine |
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| JP2013209243A (en) * | 2012-03-30 | 2013-10-10 | Taiheiyo Cement Corp | Method for producing high purity silica |
| CN108910900A (en) * | 2018-07-18 | 2018-11-30 | 浙江工业大学 | A method of iron oxide and silica nano material are prepared simultaneously from iron tailings |
| CN109876783A (en) * | 2019-04-04 | 2019-06-14 | 河北工业大学 | The method for preparing nano bubble shape manganous silicate composite material using iron tailings |
| CN112080631A (en) * | 2020-08-03 | 2020-12-15 | 中国恩菲工程技术有限公司 | Method for purifying silicon dioxide from tailings |
| CN113264531A (en) * | 2021-06-25 | 2021-08-17 | 福建省沙县金沙白炭黑制造有限公司 | Preparation method of granular feed additive silicon dioxide |
| CN114588999A (en) * | 2022-03-08 | 2022-06-07 | 北京科技大学 | Low-carbon green preparation of high-purity SiO from iron tailings2Method |
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2022
- 2022-10-13 CN CN202211250603.8A patent/CN115316508A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1519369A (en) * | 1975-08-22 | 1978-07-26 | Kemmlitz Silikatrohstoff | Process for the production of sio2 |
| US20020102198A1 (en) * | 2000-11-25 | 2002-08-01 | Degussa Ag | High-structure precipitated silicas |
| US20060051279A1 (en) * | 2002-11-27 | 2006-03-09 | Gudmundur Gunnarsson | Process for production of silica from olivine |
| CN1956923A (en) * | 2004-01-14 | 2007-05-02 | Cod技术股份公司 | Process for production of precipitated silica from olivine |
| CN102275938A (en) * | 2011-07-21 | 2011-12-14 | 中国地质大学（武汉） | Method for preparing silicon dioxide nanotubes from halloysite used as raw material |
| JP2013209243A (en) * | 2012-03-30 | 2013-10-10 | Taiheiyo Cement Corp | Method for producing high purity silica |
| CN108910900A (en) * | 2018-07-18 | 2018-11-30 | 浙江工业大学 | A method of iron oxide and silica nano material are prepared simultaneously from iron tailings |
| CN109876783A (en) * | 2019-04-04 | 2019-06-14 | 河北工业大学 | The method for preparing nano bubble shape manganous silicate composite material using iron tailings |
| CN112080631A (en) * | 2020-08-03 | 2020-12-15 | 中国恩菲工程技术有限公司 | Method for purifying silicon dioxide from tailings |
| CN113264531A (en) * | 2021-06-25 | 2021-08-17 | 福建省沙县金沙白炭黑制造有限公司 | Preparation method of granular feed additive silicon dioxide |
| CN114588999A (en) * | 2022-03-08 | 2022-06-07 | 北京科技大学 | Low-carbon green preparation of high-purity SiO from iron tailings2Method |
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