CN113244976A - Corn embryo extraction processing technology - Google Patents
Corn embryo extraction processing technology Download PDFInfo
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- CN113244976A CN113244976A CN202110713266.0A CN202110713266A CN113244976A CN 113244976 A CN113244976 A CN 113244976A CN 202110713266 A CN202110713266 A CN 202110713266A CN 113244976 A CN113244976 A CN 113244976A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
- B02B1/00—Preparing grain for milling or like processes
- B02B1/04—Wet treatment, e.g. washing, wetting, softening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
- B02B3/00—Hulling; Husking; Decorticating; Polishing; Removing the awns; Degerming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
- B02B5/00—Grain treatment not otherwise provided for
- B02B5/02—Combined processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
Abstract
The invention discloses a corn embryo extraction processing technology, and belongs to the technical field of corn processing. Which comprises the following steps: watering; removing embryo and breaking slag; air suction separation: screening and grading; separating out a mixture of germ and endosperm; the embryo and the endosperm are sent to a color sorter by a lifting machine to sort out the embryo and the endosperm according to color difference; and (4) carrying out peeling treatment on the sorted endosperm. The corn embryo extraction processing technology provided by the invention has the advantages that the corn is subjected to water absorption treatment, the root of the corn absorbs water, the flexibility of corn embryos is improved, the binding force between the cortex and the embryo body is weakened, the complete falling of the cortex of the root cap and the embryo body by an embryo remover is facilitated, then wind power extraction and grading screening are carried out by an air suction separator and a grading screen, and then the embryo and the endosperm are subjected to color difference separation by a lifter, so that the integrity of the embryo is ensured, the embryo extraction efficiency is improved, the embryo integrity can reach 95%, the embryo extraction efficiency can reach 99%, and the embryo extraction quality and the embryo extraction rate are far higher than those of the embryo extracted by the conventional dry method.
Description
Technical Field
The invention relates to the technical field of corn processing, in particular to a corn embryo extraction processing technology.
Background
Corn is called gold crop and is one of the most important food crops in China. The 4 grains of the corn-soybean milk are rich in nutrition, contain various nutritional ingredients such as protein, fat, starch, sugar, vitamins and the like, can be used as grains, food and feed, and has wide market prospect when being deeply processed and comprehensively utilized.
Corn kernel consists of cortex, aleurone layer, endosperm, embryo and root cap. The skin layer covers the surface of the kernel and consists of hard, compact cells (epidermis) and a very thin, translucent film (testa) without cellular structure. The epidermis is formed of cells in an oblong shape having thick walls and micropores, and has a certain water absorption property. In the lower part of the seed coat is the embryo and endosperm. The endosperm is a pericyte, which is filled with starch. The outermost layer of the endosperm is composed of large transparent cells called the aleurone layer. The aleurone layer is also a pigment layer and appears as the color of corn through the cortex. The embryo is positioned at the base of the corn kernel, is a soft and elastic substrate, accounts for 9-10% of the weight of the corn kernel, and has a volume of 1/8-1/4 of the volume of the corn kernel. And has the following characteristics: the oil content is up to 35-40%, which is about 80% of the oil content of the corn kernel, and the corn kernel can permeate into endosperm; protein content of about 17% to 20%; the moisture changes along with the moisture of the corn kernels, namely the larger the moisture of the corn kernels is, the larger the difference of the moisture of the embryos higher than the moisture of the corn kernels is; the smaller the moisture of the corn kernels is, the smaller the difference of the moisture of the embryos lower than the moisture of the corn kernels is; when the moisture of the corn kernels is about 20%, the moisture difference between the corn kernels and the embryos is the minimum; the embryo tissue composed of cellulose and hemicellulose is loose and has toughness and elasticity. The root cap is positioned at the bottom of the corn kernel, and is basically separated in the processing process, so that the use value is not high.
Currently, embryo extraction of corn is divided into dry method embryo extraction, semi-wet method embryo extraction and wet method embryo extraction. And (3) embryo extraction by a dry method: when the moisture of the corn is less than 14.5 percent, the corn is directly subjected to slag breaking and degerming by a corn degerming machine. The dry embryo extraction can cause higher embryo loss rate, cause higher starch contained in embryo seeds to be wasted, is not beneficial to the processing production of corn, and is mainly applied to the processing production of food such as corn flakes, defatted corn flour and the like. Wet embryo extraction: the corn is soaked in water containing sulfurous acid before being ground and degermed. After soaking, the embryo is obtained by grinding, degerming and cyclone separation. The embryo extraction efficiency of wet embryo extraction can reach 85% -95%, but because the moisture of the embryo reaches about 60%, the embryo needs to be dried, the energy consumption is large, the production cost is high, the investment recovery period is long, and the method is mainly applied to the production of industries such as glucose and starch.
Semi-wet embryo extraction: by utilizing the water absorption difference of the maize germ and the endosperm, when the maize moisture is 14%, the maize is added with water to 16-18%, the moistening and sealing time is 4-8h, the moisture grain is dried to 18-20%, the water is not added, but the moisture grain needs to be modified for 15-30 d, and the maize germ is obtained by degerming, screening, pressing, screening again to obtain the embryo bud and finally purifying by wind. The whole embryo extraction process has relatively long time and more equipment requirements, is mainly applied to the production of industries such as alcohol plants and the like, and can also be used for corn processing.
Disclosure of Invention
The invention aims to provide a corn embryo extraction processing technology to solve the problems of low embryo integrity rate and high embryo loss rate in the existing corn embryo extraction by a dry method.
The technical scheme for solving the technical problems is as follows:
a corn embryo extraction processing technology comprises the following steps:
watering: absorbing water and expanding the screened and stone-removed corns in a dampening machine;
degerming and breaking slag: performing degerming and residue breaking treatment on the corn subjected to water treatment in a degerming machine;
air suction and classification: performing air extraction and grading separation on the peel, powder, germ and endosperm obtained after degerming treatment in an air suction separator and a grader to obtain a mixture of germ and endosperm;
color difference sorting: separating the mixture of the germ and the endosperm in a color separator according to color difference to obtain the germ and the endosperm;
peeling: and (5) carrying out secondary peeling treatment on the endosperm separated by the color difference in a peeling machine.
Further, in a preferred embodiment of the present invention, the screening step before the water treatment comprises: screening high-quality corn in a vibrating screen to remove dust and granular sandstone larger than and smaller than corn grains.
Further, in a preferred embodiment of the present invention, the step of removing stones before the water treatment comprises: and (3) removing heavy impurities which are the same as the corn kernels from the screened corn by using a gravity specific gravity stoner.
Further, in the preferred embodiment of the present invention, the above-mentioned soaking time is 15-25 min.
Further, in a preferred embodiment of the present invention, the moisture content of the water-treated corn is 15-16%.
Further, in a preferred embodiment of the present invention, the germ and endosperm separated by classification are fed into a color sorter through a lifter.
Further, in a preferred embodiment of the present invention, the above-mentioned corn embryo extraction processing process further comprises: the endosperm after the secondary peeling treatment is crushed in a slag making machine to prepare the corn grit with different grain sizes required by the market.
Further, in a preferred embodiment of the present invention, the above-mentioned corn embryo extraction process further comprises milling: the endosperm after slag making can be ground in a mill.
Further, in the preferred embodiment of the present invention, the vibrating screen, the stone remover, the water supplier, the induced draft separator, the classifying screen, the elevator, the slag making machine and the fine grinding machine are all connected with a dust remover to remove dust generated during operation.
The invention has the following beneficial effects:
1. the corn embryo extraction processing technology provided by the invention has the advantages that the corn is subjected to water absorption treatment, the corn roots absorb water, the flexibility of corn embryos is improved, the binding force between the cortex and the embryo body is weakened, the complete falling of the cortex of the root cap and the embryo body by an embryo remover is facilitated, wind power extraction and classification screening are carried out by an air suction separator and a classification screen, then the embryo and endosperm are sent to a color selector by a lifter to be subjected to color difference separation, the integrity of the embryo is ensured, the embryo extraction efficiency is improved, the embryo integrity can reach 95%, the embryo extraction efficiency can reach 99%, and the embryo extraction quality and the embryo extraction rate are far higher than those of the embryo extracted by the conventional dry method.
2. The corn embryo extraction processing technology of the invention breaks through the problem of dry corn embryo extraction, and can be applied to the feed industry, the alcohol industry and the starch industry. The corn germ obtained by embryo extraction can be further processed into high-protein drinks besides processing high-quality edible oil, so that the high added value of the corn germ is fully exerted, and the economic benefit of the corn processing industry is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a process flow diagram of the corn embryo extraction processing system of the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with the embodiments and the accompanying drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Referring to fig. 1, the present invention further provides a system for embryo extraction and processing of corn, wherein the process for embryo extraction and processing of corn is performed based on the system for embryo extraction and processing of corn. The corn embryo-extracting and processing system comprises a vibrating screen, a stone remover, a water applying machine, an embryo-removing machine, an air suction separator, a grading screen, a lifter, a color selector, a peeling machine, a dreg making machine and fine powder grinding which are sequentially connected.
The vibrating screen is used for vibrating and screening the selected high-quality corn to remove dust and granular sandstone larger than and smaller than the corn grains; the stone remover is a gravity specific gravity stone remover and is used for further removing heavy impurities which are the same as the corn kernels; the dampening machine absorbs water for 15-25min to expand the screened corn until the water content of the corn reaches 15-16%; and then the corn is sent into a degerming machine for degerming and residue breaking treatment, the complete corn is decomposed into cortex, embryo, endosperm and corn powder generated in the breaking, a filter screen of the degerming machine screens out the corn cortex, the remaining embryo, endosperm and corn powder are subjected to wind power extraction of an induced draft separator and classification screening for classification and separation of an embryo and endosperm mixture, and the separated embryo and endosperm mixture is sent into a color selector by a lifting machine for color difference separation.
Before entering the color sorter, the corn powder is screened to avoid the existence of the corn powder from blocking the color sorter to influence normal work. The color selector screens according to the difference of the colors of the embryo and the endosperm, the endosperm is milk white, the embryo is yellow, and the embryo and the endosperm are very different and can be screened easily. The endosperm separated by the color sorting is peeled for the second time in a peeling machine, the peel layer at the top of the endosperm is removed, the endosperm after the second peeling is crushed in a slag making machine to prepare corn grits with different grain sizes required by the market, and the endosperm after the slag making treatment can be finely ground in a flour mill. The vibrating screen, the stone removing machine, the water attaching machine, the air suction separator, the classifying screen, the elevator, the slag making machine and the fine grinding are all connected with the dust remover, dust generated in work is removed in time, safety of work is guaranteed, and effectiveness of blank extraction is improved.
In the invention, the corn moisture content is improved to 15-16% in a short time by carrying out water treatment on the corn for 15-25min, the treatment time is short, and the embryo extraction process time is shortened. The water content of the corn is slightly increased, the combination of the cortex and the embryo of the corn kernel is weakened, the cortex can fall off, and the embryo integrity is ensured to be not broken easily. Under normal conditions, the corn kernels are not easy to separate because the cortex and the endosperm of the corn kernels are combined into a healing state. The cortex has certain water absorption, and the cortex absorbs water to weaken the binding force with the embryo when in processing, and the cortex is easily torn off from the embryo and the endosperm by the external force extrusion, impact and friction of the embryo removing machine, thus being beneficial to the separation of the embryo endosperm and the cortex, and creating rational conditions for improving the embryo extraction efficiency and ensuring the integrity of the embryo. In addition, the corn embryo body contains about 7.5 percent of cellulose and hemicellulose, constitutes an embryo body with loose tissue, is rich in toughness and elasticity, contains protein with half of fat content, and also has better water absorption. By absorbing water, the corn embryo absorbs water to expand the volume of protein and phospholipid, weaken the binding force between the embryo and the cortex, enable the cortex to be easily torn and shed from embryo and endosperm, and be not easy to break, thus being beneficial to shedding and extraction of the embryo.
In degerming, the intact corn is decomposed into cortex, embryo, endosperm and corn powder generated in crushing, the degerming machine is provided with a filter screen to screen out the corn cortex, and the remaining embryo, endosperm and corn powder are subjected to air suction separation by an air suction separator and are classified by a classifying screen to separate the mixture of embryo and endosperm. Because the embryo and the endosperm have the same mass and volume, the embryo and the endosperm cannot be screened by the grading screen, and the color difference sorting is carried out by the color selector according to the difference of the colors of the embryo and the endosperm, wherein the endosperm is milk white, the embryo is yellow, and the embryo and the endosperm are very easy to screen due to great difference. Before entering the color sorter, the corn powder is screened by the hoister, and the mixture of the germ and the endosperm is sent into the color sorter, so that the normal work of the color sorter is prevented from being influenced by the blockage of the color sorter due to the existence of the corn powder.
The corn embryo extraction processing technology provided by the invention has the advantages that the corn is subjected to water absorption treatment, the corn roots absorb water, the flexibility of corn embryos is improved, the binding force between the cortex and the embryo body is weakened, the complete falling of the cortex of the root cap and the embryo body by an embryo remover is facilitated, wind power extraction and classification screening are carried out by an air suction separator and a classification screen, then the embryo and endosperm are sent to a color selector by a lifter to be subjected to color difference separation, the integrity of the embryo is ensured, the embryo extraction efficiency is improved, the embryo integrity can reach 95%, the embryo extraction efficiency can reach 99%, and the embryo extraction quality and the embryo extraction rate are far higher than those of the embryo extracted by the conventional dry method.
Example 1:
the corn embryo extraction processing technology comprises the following steps:
(1) screening: screening high-quality corns in a vibrating screen, and removing dust and granular gravels larger than and smaller than corn grains;
(2) removing stones: removing heavy impurities which are the same as the corn kernels from the screened corn by a gravity specific gravity stoner;
(3) watering: the corn after stone removal treatment is subjected to water absorption treatment in a dampening machine for 15min and is expanded until the water content of the corn reaches 15%;
(4) degerming and breaking slag: performing degerming and residue breaking treatment on the corn subjected to water treatment in a degerming machine;
(5) air suction and classification: performing air suction separation and grading separation on the peel, powder, germ and endosperm obtained after degerming treatment in an air suction separator and a grader to obtain a germ and endosperm mixture;
(6) lifting: feeding the sorted mixture of the germ and the endosperm into a color sorter through a lifting machine;
(7) color difference sorting: separating the mixture of germ and endosperm from the lifter in a color sorter according to color difference;
(8) peeling: performing secondary peeling treatment on the endosperm separated by the color difference in a peeling machine;
(9) preparing slag: crushing the endosperm after the secondary peeling treatment in a slag making machine to prepare corn grits with different granularity required by the market;
(10) grinding: the endosperm after slag making can be ground in a mill.
Wherein the vibrating screen, the stone remover, the dampening machine, the air suction separator, the classifying screen, the elevator, the slag making machine and the fine grinding are all connected with a dust remover to remove dust generated in work.
Example 2:
the corn embryo extraction processing technology comprises the following steps:
(1) screening: screening high-quality corns in a vibrating screen, and removing dust and granular gravels larger than and smaller than corn grains;
(2) removing stones: removing heavy impurities which are the same as the corn kernels from the screened corn by a gravity specific gravity stoner;
(3) watering: the corn after stone removal treatment is subjected to water absorption treatment in a dampening machine for 20min and is expanded until the water content of the corn reaches 15.6 percent;
(4) degerming and breaking slag: performing degerming and residue breaking treatment on the corn subjected to water treatment in a degerming machine;
(5) air suction and classification: performing air suction separation and grading separation on the peel, powder, germ and endosperm obtained after degerming treatment in an air suction separator and a grader to obtain a germ and endosperm mixture;
(6) lifting: feeding the sorted mixture of the germ and the endosperm into a color sorter through a lifting machine;
(7) color difference sorting: separating the mixture of germ and endosperm from the lifter in a color sorter according to color difference;
(8) peeling: performing secondary peeling treatment on the endosperm separated by the color difference in a peeling machine;
(9) preparing slag: crushing the endosperm after the secondary peeling treatment in a slag making machine to prepare corn grits with different granularity required by the market;
(10) grinding: the endosperm after slag making can be ground in a mill.
Wherein the vibrating screen, the stone remover, the dampening machine, the air suction separator, the classifying screen, the elevator, the slag making machine and the fine grinding are all connected with a dust remover to remove dust generated in work.
Example 3:
the corn embryo extraction processing technology comprises the following steps:
(1) screening: screening high-quality corns in a vibrating screen, and removing dust and granular gravels larger than and smaller than corn grains;
(2) removing stones: removing heavy impurities which are the same as the corn kernels from the screened corn by a gravity specific gravity stoner;
(3) watering: the corn after stone removal treatment is subjected to water absorption treatment in a dampening machine for 25min and is expanded until the water content of the corn reaches 16 percent;
(4) degerming and breaking slag: performing degerming and residue breaking treatment on the corn subjected to water treatment in a degerming machine;
(5) air suction and classification: performing air suction separation and grading separation on the peel, powder, germ and endosperm obtained after degerming treatment in an air suction separator and a grader to obtain a germ and endosperm mixture;
(6) lifting: feeding the sorted mixture of the germ and the endosperm into a color sorter through a lifting machine;
(7) color difference sorting: separating the mixture of germ and endosperm from the lifter in a color sorter according to color difference;
(8) peeling: performing secondary peeling treatment on the endosperm separated by the color difference in a peeling machine;
(9) preparing slag: crushing the endosperm after the secondary peeling treatment in a slag making machine to prepare corn grits with different granularity required by the market;
(10) grinding: the endosperm after slag making can be ground in a mill.
Wherein the vibrating screen, the stone remover, the dampening machine, the air suction separator, the classifying screen, the elevator, the slag making machine and the fine grinding are all connected with a dust remover to remove dust generated in work.
Comparative example 1
The corn embryo extraction processing technology of the comparative example is the same as the corn embryo extraction processing technology of the example 2, and the difference is that in the step (3), the corn after stone removal treatment is subjected to water absorption treatment in a water absorbing machine for 20min and is expanded until the water content of the corn reaches 14.8%.
Comparative example 2
The corn embryo extraction processing technology of the comparative example is the same as the corn embryo extraction processing technology of the example 2, and the difference is that in the step (3), the corn after stone removal treatment is subjected to water absorption treatment in a water absorbing machine for 20min and is expanded until the water content of the corn reaches 16.2%.
Comparative example 3
The corn embryo extraction processing technology of the comparative example is the same as the corn embryo extraction processing technology of the example 2, and is different from the technology that water is attached in the step (3): and (3) performing water absorption treatment on the corn subjected to stone removal treatment in a dampening machine for 20min to expand until the water content of the corn reaches 15.6%.
Comparative example 4
The corn embryo-extracting processing technology of the comparative example is the dry method embryo-extracting in the prior art.
The following data were obtained by counting the embryo extraction rate and the embryo integrity rate obtained by the corn embryo extraction processing techniques of examples 1 to 3 and comparative examples 1 to 4:
from the results, the corn embryo extraction processing technology provided by the invention has the advantages that the corn is subjected to water treatment, so that the root of the corn absorbs water, the flexibility of corn embryos is improved, the binding force between the cortex and the embryo body is weakened, the complete falling of the root cap cortex and the embryo body by the embryo extractor is facilitated, then the wind power extraction and the grading screen grading are carried out by the air suction separator and the grading screen, and then the embryo and the endosperm are sent to the color selector by the elevator for color difference sorting, so that the integrity of the embryo is ensured, the embryo extraction efficiency is improved, the embryo integrity can reach 95%, the embryo extraction efficiency can reach 99%, and the embryo extraction quality and the embryo extraction rate are far higher than those of the embryo extracted by the existing dry method.
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 (9)
1. The corn embryo extraction processing technology is characterized by comprising the following steps:
watering: absorbing water and expanding the screened and stone-removed corns in a dampening machine;
degerming and breaking slag: performing degerming and residue breaking treatment on the corn subjected to water treatment in a degerming machine;
air suction and classification: performing air suction separation on the peel, powder, germ and endosperm obtained after degerming treatment by an air suction separator and a classifier, and classifying to obtain a germ and endosperm mixture;
color difference sorting: separating the mixture of the germ and the endosperm in a color separator according to color difference to obtain the germ and the endosperm;
peeling: and (5) carrying out secondary peeling treatment on the endosperm separated by the color difference in a peeling machine.
2. The corn embryo extraction process of claim 1, wherein the screening step before the water treatment comprises: screening high-quality corn in a vibrating screen to remove dust and granular sandstone larger than and smaller than corn grains.
3. The corn embryo extraction process as claimed in claim 2, wherein the stone removing step before the water treatment comprises: and (3) removing heavy impurities which are the same as the corn kernels from the screened corn by using a gravity specific gravity stoner.
4. The corn embryo extraction process of any one of claims 1-3, wherein the soaking time is 15-25 min.
5. The corn germ extraction process of claim 4, wherein the corn has a moisture content of 15-16% after water treatment.
6. The process of claim 4, wherein the separated germ and endosperm are fed to a color sorter via a lifting machine.
7. The corn embryo extraction process of claim 6, further comprising the following steps: the endosperm after the secondary peeling treatment is crushed in a slag making machine to prepare the corn grit with different grain sizes required by the market.
8. The corn embryo extraction process of claim 7, further comprising milling: the endosperm after the slag making treatment is finely ground in a mill.
9. The corn embryo extraction process according to claim 8, wherein the vibrating screen, the stone remover, the dampening machine, the air suction separator, the classifying screen, the elevator, the slag making machine and the fine grinding machine are all connected with a dust remover to remove dust generated in the work.
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| CN114433299A (en) * | 2022-02-18 | 2022-05-06 | 河南华泰粮油机械股份有限公司 | Production process for efficiently extracting germs in large soybean processing factory |
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