Cattle and sheep lick brick with magnesium phosphate cement as binding material and preparation method of cattle and sheep lick brick

Abstract

The invention discloses a cattle and sheep lick brick with magnesium phosphate cement as a binding material and a preparation method of the cattle and sheep lick brick, and belongs to the technical field of animal feed. The lick brick is prepared from 30-40 parts of magnesium phosphate cement, 20-25 parts of molasses, 3-8 parts of table salt, 10-15 parts of urea, 1-2 parts of an antioxidant, 10-15 parts of plant fiber powder, 1-2 parts of an immunopotentiator, 1-2 parts of an anti-mildew agent and trace element components of iron, copper, zinc, cobalt, selenium and iodine, the magnesium phosphate cement is adopted as a core binding material, and the lick brick is prepared by ball-milling active magnesium oxide and composite phosphate; and a gradient sterilization process and a special anti-mildew agent are matched. During preparation, 24-hour normal-temperature curing molding is realized through a three-stage process of premix preparation, magnesium phosphate cement activation and sterilization final mixing molding. The obtained product has the compressive strength of 2-8 MPa, has the characteristics of rapid forming, high strength, mildew resistance and nutrient slow release, and effectively solves the technical problems of slow curing, easy mildew and nutrient loss of the traditional lick brick.

Description

Technical Field

[0001] The present invention belongs to the technical field of animal feed, and relates to a cement cattle and sheep lick brick rich in trace elements, and particularly to a cattle and sheep lick brick using magnesium phosphate cement as a binder and a preparation method thereof. Background Art

[0002] In the feeding process of ruminants such as cattle and sheep, traditional lick bricks have always been important carriers for nutritional supplementation, used to provide key nutrients such as minerals and vitamins to meet the nutritional needs of animals at different growth stages and help them grow healthily. However, most of the traditional lick bricks on the market currently use silicate cement or bentonite as binders, and these binder materials have many drawbacks, seriously affecting the overall performance and actual use effect of the lick bricks.

[0003] Although the mainstream silicate cement-based and bentonite-based bonding systems can solidify mineral components, they also bring a series of problems. On the one hand, heavy metal pollutants such as cadmium and lead are easily introduced during the calcination of silicate cement. Long-term licking by animals will cause heavy metal accumulation in the internal organs, endangering health. On the other hand, in the forming process, for example, Patent CN 109463296 B discloses a multi-dimensional multi-mineral cattle and sheep lick brick and a preparation method thereof, which uses traditional bentonite as a bonding system and relies on high pressure pressing of 10-20 MPa to increase the compressive strength to 12-15 MPa. However, excessive densification results in a daily licking amount of less than 15 g, making it difficult to meet the nutritional needs of animals. Moreover, from the perspective of functional adaptation, the existing bonding system combines with trace elements in a physical embedding manner, resulting in an explosive release of mineral elements in the acidic environment of the rumen and lacking anti-mildew components. A large number of colonies will grow under high temperature and high humidity conditions. In particular, the alkaline characteristics of silicate cement will also disrupt the physiological balance of the rumen.

[0004] In addition, the excessively long curing time is also a prominent problem. For lick bricks using silicate cement or bentonite as binders, Patent CN 105876090A discloses a nutritional and health-care lick brick for preventing goat aphtha and a preparation method thereof, which usually requires a curing time of more than 36 hours to reach a certain strength. This not only prolongs the production cycle and increases production costs, but also easily causes quality problems such as cracking and deformation due to environmental factors during the curing process. In contrast, cattle and sheep lick bricks prepared based on magnesium phosphate cement as an adhesive can quickly hydrate to form a dense structure, and the compressive strength can reach 2-8 MPa in 24 hours, which is significantly higher than that of traditional lick bricks, and can be formed without pressing, meeting the use requirements.

[0005] With the continuous development of the livestock industry, the market's performance requirements for cattle and sheep lick blocks are increasing day by day. To meet market demand and improve the quality and performance of cattle and sheep lick blocks, it is urgent to develop new bonding materials and preparation methods. As a new type of bonding material, magnesium phosphate cement has the advantages of rapid setting, high strength, water resistance, and mildew resistance, and is expected to effectively solve many problems existing in traditional lick blocks, providing a better solution for the production and application of cattle and sheep lick blocks. Summary of the Invention

[0006] In order to overcome the problems existing in the prior art, the present invention provides a cattle and sheep lick block using magnesium phosphate cement as a bonding material and its preparation method. The cattle and sheep lick block of the present invention has rapid setting, high strength, water resistance, and mildew resistance, realizes nutrient slow release and long-term stable storage, and can effectively solve the problems in the background technology.

[0007] To achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0008] A cattle and sheep lick block using magnesium phosphate cement as a bonding material is composed of the following components in parts by weight: 30-40 parts of magnesium phosphate cement, 20-25 parts of molasses, 3-8 parts of table salt, 10-15 parts of urea, 1-2 parts of antioxidant, 10-15 parts of plant fiber powder, 3-8 parts of trace element premix, 1-2 parts of immune enhancer, and 1-2 parts of anti-mildew agent.

[0009] Further, the magnesium phosphate cement is composed of the following components in parts by weight: 70-100 parts of sintered magnesium oxide, 40-100 parts of dihydrogen phosphate, and 50-80 parts of water; wherein the sintered magnesium oxide is obtained by calcining magnesite ore at 1500-1800 °C for 1-6 h, the weight percentage of MgO in the sintered magnesium oxide is ≥ 85%, and the dihydrogen phosphate is any one of ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, and calcium dihydrogen phosphate or a mixture of two or more.

[0010] Further, every 1000 g of the trace element premix contains the following trace element components in weight: among them, 33-85 g of iron, 48-80 g of copper, 45-80 g of zinc, 33-45 g of cobalt, 0.6-1.5 g of selenium, and 12-24 g of potassium. The above trace elements are derived from food-grade reagents: copper sulfate, ferrous sulfate, zinc sulfate, cobalt chloride, potassium iodide, and yeast selenium.

[0011] Further, the antioxidant is compounded from 10-20 parts by weight of diludine, 5-10 parts by weight of dibutylhydroxytoluene, and 5-10 parts by weight of citric acid.

[0012] Further, the anti-mildew agent is made from the following raw materials in parts by weight: 30-50 parts of bamboo vinegar liquid, 10-20 parts of citric acid, 5-15 parts of glycerol, 10-30 parts of chitosan, 5-15 parts of isooctanol, and 100-130 parts of water.

[0013] Furthermore, the immunopotentiator comprises 10 - 15 parts by weight of oxfendazole, 10 - 15 parts by weight of eugenol, 5 - 15 parts by weight of dimethyl sulfoxide, and 10 - 15 parts by weight of ethyl maltol, wherein the purity of eugenol is ≥98%, and the four components form a microemulsion with an average particle size <100 nm through nanoemulsification technology.

[0014] Furthermore, the plant fiber powder is any one or a mixture of peanut shell powder, rice bran, wheat bran, wheat straw, natural forage powder, corn straw, bagasse powder, corncob powder, alfalfa powder, flaxseed husk powder, etc. The fineness requirement of the plant fiber powder is 40 - 100 mesh, the proportion of 60 - 100 mesh is ≤15%, and the proportion of 40 - 60 mesh is more than 70%. The bagasse powder is pretreated with NaOH solution to remove sugar.

[0015] A preparation method of a cattle and sheep lick brick using magnesium phosphate cement as a binding material, comprising the following steps:

[0016] Step (1): Mix table salt, urea, antioxidant, plant fiber powder, mineral powder, and immunopotentiator and stir to obtain a mixture. After heating molasses, add it to the mixture in three portions and continue stirring. During the stirring process, spray an anti - mildew agent to obtain a premix; Step (2): Mix magnesium phosphate cement dry powder and mixing water to obtain an activated cement paste;

[0017] Step (3): Mix the premix and the activated cement paste and stir to obtain a lick brick slurry. Inject the lick brick slurry into a mold, perform high - temperature sterilization treatment on the lick brick slurry, and after sterilization, cool it to normal temperature and atmospheric pressure, stand still for curing, and demold to form a cattle and sheep lick brick using magnesium phosphate cement as a binding material.

[0018] A preparation method of a cattle and sheep lick brick using magnesium phosphate cement as a binding material, comprising the following steps:

[0019] Step (1): Mix table salt, urea, antioxidant, plant fiber powder, mineral powder, and immunopotentiator and stir to obtain a mixture. Heat molasses to 40 - 50 °C and add it to the mixture in three portions and continue stirring. During the stirring process, spray an anti - mildew agent with a weight ratio of 0.5% to obtain a premix;

[0020] Step (2): Mix magnesium phosphate cement dry powder and mixing water in a planetary mixer at a weight ratio of 1:0.8 - 1.2 for 90 - 120 s to obtain an activated cement paste;

[0021] Step (3): Mix the premix and the activated cement paste in a twin-shaft mixer at 45 - 90 rpm for 15 - 30 min to obtain the lick brick slurry. Inject the lick brick slurry into a mold, and perform high-temperature sterilization treatment on the lick brick slurry using a gradient heating process. Heat it at a rate of 2 °C / min to 80 °C and hold for 30 min, then raise the temperature to 121 °C at a rate of 1 °C / min and maintain for 15 - 20 min. After sterilization, cool it to normal temperature and atmospheric pressure, let it stand and cure for 24 ± 2 h, and then demold to form the cattle and sheep lick brick with magnesium phosphate cement as the bonding material.

[0022] The preparation method of magnesium phosphate cement is as follows: Co-grind magnesium oxide and phosphate in a ball mill to a specific surface area ≥ 400 m 2 / kg, and grind it into a powder with a fineness of 150 - 180 meshes; The anti-mildew agent is prepared by the following method: Add bamboo vinegar liquid, citric acid, glycerol, isooctanol and chitosan into water, stir evenly, and then heat at 60 - 80 °C for 30 - 60 minutes to fully dissolve chitosan to obtain a mixed solution; Let the mixed solution stand at normal temperature for 12 - 24 hours to obtain the anti-mildew agent. After the premix and the activated cement paste are mixed in a mixer at a rotation speed of 45 - 90 rpm for 15 - 30 min, inject them into a mold without a release agent, and let it stand and cure under the conditions of an ambient temperature of 20 - 25 °C and a relative humidity of 50 - 70%. After demolding without pressure, let it dry naturally to obtain the cattle and sheep lick brick with magnesium phosphate cement as the bonding material.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The cattle and sheep lick brick prepared by the present invention, based on magnesium phosphate cement as an adhesive, rapidly hydrates to form a dense structure, with a compressive strength of 10 - 15 MPa, significantly higher than that of traditional lick bricks, and can be formed without pressure, meeting the requirements of transportation and use, and is suitable for cattle and sheep such as plateau yaks, lake yaks, and Qinghai Tibetan sheep to lick.

[0025] 2. The cattle and sheep lick brick prepared by the present invention, based on magnesium phosphate cement as an adhesive, has a high compatibility with the animal's internal environment, its chemical properties are stable and non-toxic, and it can avoid the problems of digestive tract irritation or metabolic burden that may be caused by traditional adhesives.

[0026] 3. The cattle and sheep lick brick prepared by the present invention, by optimizing the curing process of magnesium phosphate cement, shows an extremely low solubility in the rumen environment, which can not only ensure the long-term stability of the lick brick structure, but also effectively avoid the deposition of undissolved particles in the animal body to form stones. This characteristic solves the problem of mineral deposition that may be caused by traditional silicate cement adhesives.

[0027] 4. The cattle and sheep lick bricks prepared by the present invention are based on magnesium phosphate cement as an adhesive. The magnesium phosphate cement exhibits a neutral to weakly alkaline property, which will not destroy the normal acidic environment of the rumen of ruminants while supplementing minerals. This property not only maintains the activity of the rumen microbial community but also ensures normal digestion efficiency, showing significant advantages compared with conventional alkaline adhesives.

[0028] 5. The cattle and sheep lick bricks prepared by the present invention are based on magnesium phosphate cement as an adhesive. This adhesive system can form a sustained-release structure with the mineral elements (such as iron, copper, cobalt, etc.) in the lick bricks, realizing the gradient release of nutrient elements, improving the utilization rate of trace elements, and avoiding the risk of excessive intake. It shows better controlled-release performance compared with traditional products that simply use molasses or bentonite as adhesives.

[0029] 6. The cattle and sheep lick bricks prepared by the present invention use gradient sterilization and materials such as isooctanol as anti-mildew agents, which can effectively inhibit the production of Aspergillus flavus.

[0030] 7. The cattle and sheep lick bricks provided by the present invention are rich in sugars, minerals, vitamins, and immune enhancers, with comprehensive nutrition. They can provide energy for ruminants such as cattle and sheep, keep the animals in a healthy physiological state, increase the food intake of ruminants, promote their growth, and reduce the occurrence of inflammation and diseases. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flowchart for preparing the cattle and sheep lick bricks of the present invention;

[0032] Figure 2 It is a graph of trace element dissolution of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0034] Embodiment 1 of the present invention

[0035] This embodiment provides a cattle and sheep lick brick using magnesium phosphate cement as a bonding material and its preparation method. By mass, it includes:

[0036] 40 parts of magnesium phosphate cement, 20 parts of molasses, 5 parts of salt, 10 parts of urea, 2 parts of antioxidant, 11 parts of plant fiber powder, 8 parts of trace element premix, 2 parts of immune enhancer, 2 parts of anti-mildew agent;

[0037] The magnesium phosphate cement is composed of the following components by weight: 70 parts of magnesium oxide, 40 parts of phosphate, and 90 parts of water; the magnesium oxide is sintered magnesium oxide (MgO = 85%) obtained by calcining magnesite ore at 1500 °C for 6 h, and the dihydrogen phosphate is composed of ammonium dihydrogen phosphate and potassium dihydrogen phosphate in a mass ratio of 1:2.

[0038] The mineral powder is composed of the following components by weight: 20 parts of copper sulfate, 20 parts of ferrous sulfate, 20 parts of zinc sulfate, 10 parts of cobalt chloride, 10 parts of potassium iodide, and 20 parts of yeast selenium.

[0039] Each 1000 g of the trace element premix contains the following trace element components by weight: 45 g of iron, 60 g of copper, 45 g of zinc, 38 g of cobalt, 1.5 g of selenium, and 20 g of iodine

[0040] The antioxidant is prepared by compounding 20 parts of diludine, 10 parts of dibutylhydroxytoluene, and 10 parts of citric acid.

[0041] The anti-mildew agent is prepared from the following raw materials by weight: 40 parts of bamboo vinegar liquid, 15 parts of citric acid, 10 parts of glycerol, 20 parts of chitosan, 5 parts of isooctanol, and 110 parts of water, and compounded into a 0.5% solution.

[0042] The immunopotentiator contains 10 parts of oxfendazole, 10 parts of eugenol, 10 parts of dimethyl sulfoxide, and 10 parts of ethyl maltol.

[0043] The plant fiber powder is 30% of 60-mesh corn cob powder and 70% of 80-mesh peanut shell powder.

[0044] The above materials are prepared according to the following steps:

[0045] (1) Preparation of premix: Mix table salt, urea, antioxidant, plant fiber powder, mineral powder, and immunopotentiator and stir to obtain a mixture. Heat molasses to 45 °C and add it to the mixture in three portions and continue stirring. During the stirring process, spray 0.5% of the anti-mildew agent;

[0046] (2) Pre-hydration of binder: Mix the dry powder of magnesium phosphate cement and mixing water in a planetary mixer at a ratio of 1:1 for 120 s;

[0047] (3) Sterilization and final mixing and molding: Mix the premix and the activated cement slurry in a twin-shaft mixer at 60 rpm for 20 min to obtain the lick brick slurry. Inject the slurry into the mold. After injecting the slurry into the mold, perform high-temperature sterilization treatment using a gradient heating process, heat up to 80 °C at a rate of 2 °C / min and hold for 30 min, then heat up to 121 °C at a rate of 1 °C / min and maintain for 20 min. After sterilization, cool to normal temperature and pressure, stand still and cure for 24 ± 2 h, and then demold and form.

[0048] Example 2

[0049] This embodiment provides a cattle and sheep lick brick using magnesium phosphate cement as a binder and its preparation method. By mass fraction, it includes:

[0050] 35 parts of magnesium phosphate cement, 25 parts of molasses, 12 parts of plant fiber powder, 1 part of immune enhancer;

[0051] Among them, magnesium oxide is sintered magnesium oxide (MgO = 85%) obtained by calcining magnesite ore at 1600 °C for 3 h, and the dihydrogen phosphate is composed of sodium dihydrogen phosphate and calcium dihydrogen phosphate according to the mass fraction of 2:1.

[0052] The plant fiber powder is bagasse powder treated with NaOH solution, in which the proportion of 40 - 60 mesh fineness accounts for 70%, and the proportion above 60 mesh accounts for 10%;

[0053] The curing time of the slurry is 48 h;

[0054] The rest is the same as in Example 1.

[0055] Example 3

[0056] This embodiment provides a cattle and sheep lick brick using magnesium phosphate cement as a binder and its preparation method. By mass fraction, it includes:

[0057] 25 parts of molasses, 15 parts of urea, 2 parts of antioxidant, 15 parts of plant fiber powder, 5 parts of trace element premix;

[0058] Among them, the magnesium phosphate cement is composed of the following components by weight: 80 parts of magnesium oxide, 50 parts of phosphate, 100 parts of water; among them, magnesium oxide is sintered magnesium oxide (MgO = 85%) obtained by calcining magnesite ore at 1800 °C for 2 h, and the dihydrogen phosphate is composed of ammonium dihydrogen phosphate, sodium dihydrogen phosphate and calcium dihydrogen phosphate according to the mass fraction of 1:1:1.

[0059] Each 1000 g of the trace element premix contains the following trace element components by weight: among them, 35 g of iron, 48 g of copper, 50 g of zinc, 35 g of cobalt, 0.8 g of selenium, 15 g of iodine;

[0060] The antioxidant is compounded from 15 parts of diludine, 5 parts of dibutylhydroxytoluene and 5 parts of citric acid.

[0061] The anti - mildew agent is made from the following raw materials by weight: 30 parts of bamboo vinegar liquid, 20 parts of citric acid, 10 parts of glycerol, 20 parts of chitosan, 5 parts of isooctanol, 110 parts of water, and compounded into a 1.5% solution.

[0062] The rest is the same as in Example 1.

[0063] Example 4

[0064] This embodiment provides a cattle and sheep lick brick using magnesium phosphate cement as a binder and its preparation method. By mass, it includes:

[0065] Among them, the dihydrogen phosphate used in the magnesium phosphate cement is composed of sodium dihydrogen phosphate and calcium dihydrogen phosphate in a mass ratio of 1:2;

[0066] 15 parts of plant fiber powder, a mixture of corncob powder and rice bran in a ratio of 2:1, among which the proportion of 40 - 60 mesh fineness accounts for 75%;

[0067] 1 part of anti - mildew agent, which is made from the following raw materials by weight: 50 parts of bamboo vinegar liquid, 20 parts of citric acid, 10 parts of glycerol, 30 parts of chitosan, 5 parts of isooctanol, 110 parts of water, and compounded into a 1% solution;

[0068] In the pre - hydration stage of the binder, the dry powder of magnesium phosphate cement and mixing water are mixed in a planetary mixer at a ratio of 1:1.2 for 120 s;

[0069] The rest is the same as in Example 1.

[0070] Example 5

[0071] This embodiment provides a cattle and sheep lick brick using magnesium phosphate cement as a binder and its preparation method. By mass, it includes:

[0072] Among them, the dihydrogen phosphate used in the magnesium phosphate cement is composed of sodium dihydrogen phosphate and calcium dihydrogen phosphate;

[0073] 15 parts of plant fiber powder, a mixture of natural forage powder, alfalfa powder and flaxseed shell powder in a ratio of 1:2:1, among which the proportion of 40 - 60 mesh fineness accounts for 75%;

[0074] 1 part of anti - mildew agent, which is made from the following raw materials by weight: 30 parts of bamboo vinegar liquid, 20 parts of citric acid, 10 parts of glycerol, 30 parts of chitosan, 10 parts of isooctanol, 130 parts of water, and compounded into a 1.5% solution;

[0075] In the pre - hydration stage of the binder, the dry powder of magnesium phosphate cement and mixing water are mixed in a planetary mixer at a ratio of 1:0.8 for 90 s;

[0076] Each 1000 g of trace element premix contains the following weight of trace element components: among them, 65 g of iron, 55 g of copper, 60 g of zinc, 40 g of cobalt, 1.2 g of selenium, 20 g of iodine;

[0077] The rest is the same as in Example 1.

[0078] For the above five groups of examples, a control test was carried out in a certain county of an autonomous prefecture. 60 healthy lactating sheep weighing 20 kg were selected and randomly divided into six groups. The experimental group of the first group was grazing + concentrate + the lick block of Example 1, the experimental group of the second group was grazing + concentrate + the lick block of Example 2, the experimental group of the third group was grazing + concentrate + the lick block of Example 3, the experimental group of the fourth group was grazing + concentrate + the lick block of Example 4, the control group of the fifth group was grazing + concentrate, and the experimental group of the sixth group was grazing + concentrate + the lick block of Example 5; that is, except for whether to lick the block, the other rations of the experimental group and the control group were the same. The lick blocks were hung in the sheep house for the sheep to lick freely, and the daily lick amount of the lick blocks and the weight gain changes of the first five groups in 45 days were recorded. The results are shown in Table 1.

[0079] For the sixth group, before feeding, 7 days after feeding, and 7 days after stopping feeding, blood samples were collected to measure immunoglobulin G (IgG), immunoglobulin M (IgM), immunoglobulin A (IgA), interleukin 2 (IL-2), interleukin 13 (IL-13), interleukin 9 (IL-9), interleukin 17 (IL-17), interferon-γ (IFN-γ), and tumor necrosis factor α (TNF-α). The results are shown in Table 2 and Table 3. A lick block element dissolution test was carried out on the lick block of the sixth group, and the results are shown in Figure 2 .

[0080] Table 1 Effects of supplementary lick blocks on the weight of grazing lactating sheep

[0081] Group Example 1 Example 2 Example 3 Example 4 Control group Initial weight (kg) 19.88±1.82 19.55±1.03 20.55±1.05 20.12±1.12 19.43±1.24 Final weight (kg) 23.67±2.35 23.52±1.89 24.32±2.13 24.15±2.54 21.36±1.48 Daily weight gain (g) 84.25±5.22 88.32±2.81 83.82±8.55 89.55±5.32 42.95±5.22 Daily licking amount (g) 14.15±1.13 16.44±1.58 12.88±1.83 17.28±0.93 0

[0082] Table 2 Effects of supplementary lick blocks of Example 5 on the immunity of grazing lactating sheep

[0083]

[0084] Continued from the above table:

[0085] Table 3 Effects of supplementary lick blocks of Example 5 on the immunity of grazing lactating sheep

[0086]

[0087]

[0088] The compressive strength (MPa) of the lick block was tested, and the results are shown in Table 4.

[0089] Table 4 Performance comparison of lick blocks

[0090] Group Example 1 Example 2 Example 3 Example 4 Control group Strength (MPa) 10.8±0.3 12.1±0.2 13.5±0.5 12.3±0.2 10.4±0.4

[0091] Through the above tests on the weight gain of lactating sheep, blood sample collection, the strength of the lick bricks, and the element dissolution, it is shown that the cattle and sheep lick bricks with magnesium phosphate cement as the bonding material of the present invention can achieve the purpose of fattening sheep and enhancing immunity. At the same time, its manufacturing method that can be formed without pressing can meet the corresponding usage requirements and is relatively inexpensive.

[0092] In the present invention, unless otherwise specified, the scientific and technical terms used herein have the meanings commonly understood by those skilled in the art. And the reagents, materials, and operation steps used herein are all widely used reagents, materials, and conventional steps in the corresponding fields.

[0093] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the described embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A cattle and sheep licking brick using magnesium phosphate cement as a bonding material, characterized in that: The invention is composed of the following components in parts by weight: 30-40 parts of magnesium phosphate cement, 20-25 parts of molasses, 3-8 parts of salt, 10-15 parts of urea, 1-2 parts of antioxidant, 10-15 parts of plant fiber powder, 3-8 parts of trace element premix, 1-2 parts of immunopotentiator and 1-2 parts of anti-mildew agent.

2. The cattle and sheep licking brick using magnesium phosphate cement as a bonding material according to claim 1, characterized in that: The magnesium phosphate cement is composed of the following components in parts by weight: 70-100 parts of sintered magnesium oxide, 40-100 parts of dihydrogen phosphate and 50-80 parts of water; wherein the sintered magnesium oxide is prepared by calcining magnesite at 1500-1800° C. for 1-6 hours, the weight proportion of MgO in the sintered magnesium oxide is ≥85%, and the dihydrogen phosphate is any one of ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate and calcium dihydrogen phosphate, or a mixture of two or more thereof.

3. The cattle and sheep licking brick using magnesium phosphate cement as a bonding material according to claim 1, characterized in that: Each 1000g of trace element premix contains the following weights of trace element components: 33-85g of iron, 48-80g of copper, 45-80g of zinc, 33-45g of cobalt, 0.6-1.5g of selenium and 12-24g of potassium. The above trace elements are derived from food-grade reagents: copper sulfate, ferrous sulfate, zinc sulfate, cobalt chloride, potassium iodide and yeast selenium.

4. The cattle and sheep licking brick using magnesium phosphate cement as a bonding material according to claim 1, characterized in that: The antioxidant is prepared by compounding 10 to 20 parts by weight of dihydropyridine, 5 to 10 parts by weight of butylated hydroxytoluene and 5 to 10 parts by weight of citric acid.

5. The cattle and sheep licking brick using magnesium phosphate cement as a bonding material according to claim 1, characterized in that: The anti-mildew agent is prepared from the following raw materials in parts by weight: 30-50 parts of bamboo vinegar, 10-20 parts of citric acid, 5-15 parts of glycerol, 10-30 parts of chitosan, 5-15 parts of isooctyl alcohol and 100-130 parts of water.

6. The cattle and sheep licking brick using magnesium phosphate cement as a bonding material according to claim 1, characterized in that: The immunopotentiator comprises 10-15 parts by weight of oxfendazole, 10-15 parts of eugenol, 5-15 parts of dimethyl sulfoxide and 10-15 parts of ethyl maltol, wherein the purity of eugenol is ≥98%, and the four components form a microemulsion with an average particle size of <100 nm through nanoemulsification technology.

7. The cattle and sheep licking brick using magnesium phosphate cement as a bonding material according to claim 1, characterized in that: The plant fiber powder is a mixture of any one or more of peanut shell powder, rice bran, bran, wheat straw, natural forage powder, corn stalks, bagasse powder, corn cob powder, alfalfa powder, and flaxseed shell powder. The fineness of the plant fiber powder is required to be 40-100 mesh, 60-100 mesh accounts for ≤15%, and 40-60 mesh accounts for more than 70%. The bagasse powder is pretreated with NaOH solution to remove sugar.

8. A method for preparing cattle and sheep licking bricks using magnesium phosphate cement as a bonding material according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step (1): mixing salt, urea, antioxidant, plant fiber powder, mineral powder and immunopotentiator to obtain a mixture, heating molasses and adding it to the mixture three times and continuing to stir, spraying an anti-mildew agent during stirring to obtain a premix; Step (2): mixing magnesium phosphate cement dry powder with mixing water to obtain an activated cement slurry; Step (3): Mix the premix with the activated cement paste to obtain a licking brick slurry, inject the licking brick slurry into a mold, sterilize the licking brick slurry at high temperature, cool it to room temperature and pressure after sterilization, and then let it stand for solidification and demold to obtain a cattle and sheep licking brick with magnesium phosphate cement as the bonding material.

9. The method for preparing cattle and sheep licking bricks using magnesium phosphate cement as a bonding material according to claim 8, characterized in that: The following steps are involved: Step (1): mixing salt, urea, antioxidant, plant fiber powder, mineral powder and immune enhancer to obtain a mixture, heating molasses to 40-50° C. and adding the mixture three times and continuing to stir, spraying 0.5% by weight of an anti-mildew agent during stirring to obtain a premix; Step (2): mixing magnesium phosphate cement dry powder and mixing water in a planetary mixer at a weight ratio of 1:0.8-1.2 for 90-120 seconds to obtain activated cement slurry; Step (3): Mix the premix with activated cement paste in a double-shaft mixer at 45-90 rpm for 15-30 minutes to obtain a licking brick slurry, inject the licking brick slurry into a mold, and sterilize the licking brick slurry at high temperature using a gradient heating process, heating it to 80°C at 2°C / min and maintaining it for 30 minutes, then heating it to 121°C at 1°C / min and maintaining it for 15-20 minutes. After sterilization, cool it to room temperature and pressure and let it stand and solidify for 24±2 hours, then demold and shape it to obtain cattle and sheep licking bricks with magnesium phosphate cement as the bonding material.

10. The method for preparing cattle and sheep licking bricks using magnesium phosphate cement as a bonding material according to claim 8, characterized in that: The preparation method of magnesium phosphate cement is as follows: magnesium oxide and phosphate are ground together in a ball mill to a specific surface area of ​​≥400m 2 / kg, and ground into powder with a fineness of 150-180 mesh; the mildew-proof agent is prepared by the following method: bamboo vinegar, citric acid, glycerol, isooctyl alcohol and chitosan are added into water, stirred evenly, and heated at 60-80°C for 30-60 minutes to fully dissolve the chitosan to obtain a mixed solution; the mixed solution is allowed to stand at room temperature for 12-24 hours to obtain the mildew-proof agent; the premix and activated cement slurry are mixed in a mixer at a speed of 45-90rpm for 15-30min, injected into a mold without a release agent, and allowed to stand and solidify under the conditions of an ambient temperature of 20-25°C and a relative humidity of 50-70%, and dried naturally in the shade without pressurizing and demoulding to obtain cattle and sheep licking bricks with magnesium phosphate cement as a bonding material.

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