Preparation method of enhanced nutritional bamboo salt

Abstract

The invention provides a preparation method of enhanced nutritional bamboo salt, which comprises the following steps: loading soluble chlorine salt into live bamboos, newly cut bamboo with leaves or cut bamboo stalks, and cutting off to obtain nutrient enhanced bamboo tubes; adding water to adjust the water content of the raw salt to 3-15%, preparing bamboo leaves into slurry, adding the slurry to the bottom of the bamboo tube, then filling the nutrition-enhanced bamboo tube with the salt, and baking with fuel to obtain the enhanced nutritional bamboo salt. According to the method, chlorine salt is adopted for conducting mineral substance enrichment on fresh bamboo tubes to obtain nutrient enrichment type bamboo tubes, then the nutrient enrichment type bamboo tubes are adopted for salt loading and baking, mineral substances enriched in the bamboo tubes are transferred into bamboo salt in the high-temperature baking process, and the purpose of nutrient enrichment of elements such as calcium, potassium, iron, zinc and magnesium is achieved. The bamboo leaf pulp can absorb heat at the bottom of the bamboo tube, delay the burning-through time of the bottom of the bamboo tube and increase upward migration of minerals from the center of the salt column. And mineral substances of bamboo leaves on the wall and at the bottom of the bamboo tube are enriched and enhanced, so that enhanced nutritional bamboo salt is obtained and is particularly suitable for large-diameter bamboo tubes.

Description

Technical Field

[0001] The invention belongs to the technical field of bamboo salt, and in particular relates to a method for preparing enhanced nutritional bamboo salt. Background Art

[0002] Bamboo salt has a history of more than 1,000 years in my country. The traditional method of preparing bamboo salt is to put the salt into a bamboo tube, seal it with loess, and burn it with pine wood. After cooling, the salt column is crushed and burned repeatedly. When it is burned for the 9th time, pine resin is added, the temperature rises to 1300℃, and then it is quenched and crystallized to obtain 9-baked bamboo salt. Bamboo salt can be greatly improved by baking once. As the number of baking times increases, more minerals in the bamboo melt, and the alkalinity of bamboo salt continues to increase. It is generally divided into ordinary one-baked, three-baked and nine-baked bamboo salt.

[0003] The current production has the following deficiencies:

[0004] 1. Traditional baking technology has high requirements on the natural size of bamboo tubes. The diameter of bamboo tubes is 7-8cm, which is conducive to the melting of minerals and the formation of the strength of salt columns. However, the diameter of bamboo (Phyllostachys pubescens) is relatively large, especially the lower high-quality bamboo sections, the outer diameter of which is mostly above 10cm. As the diameter increases, the salt loading rate increases exponentially. The loading volume of bamboo tubes with an inner diameter of 14cm and 7cm of the same length differs by 4 times. Large-diameter bamboo tubes can improve production efficiency.

[0005] 2. The minerals in bamboo stems change with the seasons and growth, and the types and quantities of mineral elements are unstable. Bamboo salt uses high-quality bamboo stems, and bamboo branches and leaves cannot be used. Bamboo leaves are rich in chlorophyll (organic magnesium), with a magnesium content of about 10 times that of bamboo stems, a K content of about 10 times that of bamboo stems, a Fe content of about 3 times that of bamboo stems, and a Ca content of about 2 times that of bamboo stems.

[0006] 3. The content of trace elements in the bamboo pole itself is limited, and the amount of salt in contact with the bamboo tube is small. The salt in the center of the salt column contains less minerals carried in by water penetration, and the mineral distribution inside the salt column is uneven. Roasting in large-diameter bamboo tubes has a certain impact on the quality of bamboo salt.

[0007] 4. Traditional technology increases the alkalinity and mineral content of bamboo salt by baking it for many times, thus improving the quality of bamboo salt. However, as the baking times increase, the production cycle is prolonged, energy consumption increases, the bamboo salt yield decreases, and the production cost increases. The price of pure 9-baked bamboo salt is expensive.

[0008] In the bamboo salt production process, the bamboo tube serves as a load-bearing container during heating, provides water and minerals, and the minerals in the bamboo migrate into the salt column with the water. The bamboo tube gradually carbonizes and provides heat energy in the later stage of baking. Under high temperature, the water-soluble minerals in the bamboo melt with the salt, and the bamboo ash and smoke contact and penetrate and fuse with the surface of the bamboo salt column at high temperature, which promotes the formation of alkalinity in the bamboo salt and increases trace elements. The microscopic structural characteristics of bamboo are: the interior of the bamboo stalk consists of vascular bundles arranged in parallel longitudinally, two large ducts transport inorganic mineral elements from bottom to top, and sieve tubes transport organic nutrients from top to bottom. In addition, the thin-walled tissue is distributed between the vascular bundles to play a filling role, and the bamboo lacks transverse conductive tissue. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a method for preparing fortified nutritional bamboo salt in view of the deficiencies of the above-mentioned prior art. The method utilizes the well-developed longitudinal water transport system of bamboo and adopts a soluble chloride salt solution to enrich the minerals in fresh bamboo tubes to obtain nutritionally fortified bamboo tubes. The nutritionally fortified bamboo tubes are then filled with salt for baking to transfer the enriched minerals into the bamboo salt to achieve the purpose of nutritional fortification. According to the method, nutritional bamboo salts rich in calcium, iron, zinc, potassium, magnesium, etc. can be produced in a targeted manner.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for preparing enhanced nutritional bamboo salt, the method comprising:

[0011] S1. Bamboo tube mineral enrichment:

[0012] Loading a soluble chloride solution into living bamboo, newly cut bamboo with leaves or cut bamboo stalks to obtain nutritionally enhanced bamboo stalks; the concentration of the soluble chloride solution is 0.5-3%;

[0013] S2. Bamboo tube processing:

[0014] Processing the nutritionally enhanced bamboo stalk obtained in S1 into a nutritionally enhanced bamboo tube with a length of 10-100 cm, the inner diameter of the bamboo tube is 6-20 cm, the bamboo tube contains more than one bamboo node, only the bottom bamboo node is retained, and other bamboo nodes are removed;

[0015] S3, Baked with Nutritious Bamboo Salt

[0016] Water is sprayed on the raw salt until the water content in the salt is 3-15%, and then densely filled into the nutritionally enhanced bamboo tube, and then roasted with fuel to obtain a roasted enhanced nutritional bamboo salt.

[0017] Preferably, the inner diameter of the bamboo tube in S1 is 10-20 cm.

[0018] Preferably, the soluble chloride salt in S1 is one or a mixture of two or more of ferric chloride, magnesium chloride, zinc chloride, calcium chloride and potassium chloride.

[0019] Preferably, the soluble chloride salt solution also contains edible ethanol, and the volume ratio of edible ethanol to the solvent water in the solution is 1-3:4.

[0020] Preferably, before the salt in S3 is loaded into the bamboo tube, bamboo leaf slurry is first added into the bamboo tube, and the height of the bamboo leaf slurry at the bottom of the bamboo tube is 1-5% of the height of the bamboo tube; the preparation method of the bamboo leaf slurry is: bamboo leaf powder is added to water and stirred evenly to obtain bamboo leaf slurry; the mass ratio of water to bamboo leaf powder in the bamboo leaf slurry is 1:1-3.

[0021] Preferably, the fuel in S3 can be fuel processed from pine wood, miscellaneous wood or bamboo raw materials.

[0022] Preferably, the method for processing the bamboo raw material into fuel is: crushing the bamboo raw material to obtain bamboo crushed material, drying it to a moisture content of 5-15%, and then pressing it into a hollow rod A as a biomass fuel, and further processing the hollow rod A into bamboo charcoal; adding pine leaf powder and rosin or natural rosin to the bamboo crushed material, pressing it into a hollow rod C, and using the hollow rod C as an enhanced biomass fuel;

[0023] The baking process in S3 is as follows: the bamboo tube filled with salt is baked at low temperature for 0.5-2h using bamboo charcoal to make the bamboo tube lose water and carbonize, and then the enhanced biomass fuel is used to bake until the bamboo tube burns, and then the bamboo biomass fuel or bamboo charcoal is used to continue baking for 1-3h to form a dense salt column, and the bamboo salt column is crushed to obtain a baked bamboo salt.

[0024] Preferably, the baking process in S3 is repeated multiple times, and the enhanced nutritional bamboo salt obtained in the previous baking is used as the raw salt in the next baking, and finally the multi-baked enhanced nutritional bamboo salt is obtained.

[0025] Preferably, when bamboo salt is roasted in a bamboo tube with an inner diameter greater than 12 cm, selenium-rich edible powder is added to the raw salt in S4 before spraying water, and the amount of selenium-rich edible powder added is calculated based on a selenium content of 20 mg / kg in the final mixture.

[0026] Preferably, the soluble chloride salt solution in S1 is loaded into the truncated bamboo stalk in the following manner: immersing one end of the fresh bamboo stalk in the soluble chloride salt solution, pulling and replacing the liquid in the vascular bundle of the bamboo stalk under the action of negative pressure, and obtaining replaced bamboo juice and nutritionally enhanced bamboo stalk after the replacement is completed;

[0027] The replaced bamboo juice partially or completely replaces the water in S3, is sprayed on the raw salt, and the water content in the salt is adjusted to 3-15% to obtain the fortified salt, which is then densely filled into the nutritionally fortified bamboo tube obtained in S2, and then baked with fuel to obtain a baked fortified nutritional bamboo salt;

[0028] The soluble chloride solution is loaded into the living bamboo and the newly cut bamboo with leaves in the following manner: the enrichment method of the living bamboo and the newly cut bamboo with leaves utilizes the transpiration of bamboo leaves, immerses the roots of the newly cut bamboo with leaves into the soluble chloride solution, or injects the soluble chloride solution into a bamboo tube section near the root of the living bamboo.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. The present invention is particularly suitable for the preparation of bamboo salt from large-diameter bamboo tubes, which increases the uniformity of the quality of the salt column and is more adaptable to the diameter of the bamboo tube. The large-diameter bamboo tubes can hold more salt and have a higher baking output. The efficiency of traditional bamboo salt filling can be increased by 1-20 times, and the number of bamboo tubes used can be reduced.

[0031] 2. The present invention makes use of the disadvantage of bamboo stalks lacking transverse permeable tissue at the microscopic level, and uses a specific mineral chloride solution to replace the bamboo tube with liquid and enrich the elements, thereby obtaining a nutritionally enhanced bamboo tube. Specifically, when using traction replacement, replaced bamboo sap can also be obtained, which can be added to the original salt to adjust the moisture content. Through the dual mineral enhancement of bamboo tubes and salt, nutritionally enhanced bamboo salts rich in calcium, potassium, iron, zinc, magnesium, etc. can be obtained.

[0032] 3. The present invention utilizes the characteristics that the bottom of the bamboo tube is heated first, carbonized and burned first, and heated for the longest time during the heating process, as well as the rising characteristics of the liquid in the bamboo material during the vaporization process, and adds bamboo branch and leaf pulp rich in specific mineral salts to the bottom of the bamboo tube. The slurry temperature rises to achieve the local hot steam mineral leaching effect, and as the water evaporates and migrates upward, it merges with the salt in the center of the bamboo tube. The bamboo wall can radiate to the periphery of the salt column through mineral enhancement. Through the synergistic enhancement of the inside and outside, it not only overcomes the uneven distribution of minerals caused by the large diameter of the bamboo tube, but also strengthens the specific trace elements and alkalinity. During the baking process, the bamboo leaf pulp can absorb the heat buffer at the bottom of the bamboo tube, delay the time for the bottom of the bamboo tube to burn through, and increase the strength of the bamboo salt column. The very small amount of ash remaining after the bamboo leaf pulp is baked will naturally separate from the bamboo tube with gravity.

[0033] 4. The present invention can use ethanol to improve the efficiency of element extraction or leaching, and at the same time it can play a role in combustion support, and can also save part of the baking heat energy consumption, thereby doubly improving the production efficiency.

[0034] 5. The present invention is applicable to bamboo tubes of all diameters. When large-diameter bamboo tubes (with an inner diameter greater than 10 cm) are used, the temperature inside the bamboo tubes during the baking process is less than 600°C, which is suitable for direct baking to prepare selenium-rich nutritious bamboo salt.

[0035] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a picture of a salt column with a diameter of 15-20 cm prepared in Example 1 of the present invention.

[0037] Figure 2 This is a picture of the crushed salt column prepared in Example 1 of the present invention.

[0038] Figure 3 This is a test picture of the bamboo branches of the present invention for absorbing soluble chloride salts.

[0039] Figure 4 This is a picture of the high temperature melting of chloride salt and salt in the ratio of 1:5 in the present invention.

[0040] Figure 5 This is a SEM picture of the raw sun-dried sea salt in the present invention.

[0041] Figure 6 This is a SEM image of the triple-roasted enhanced nutritional bamboo salt prepared in Example 3 of the present invention.

[0042] Figure 7 The large-diameter selenium-rich nutritious bamboo salt is prepared according to Example 5 of the present invention. DETAILED DESCRIPTION

[0043] Example 1

[0044] This embodiment discloses a method for preparing fortified nutritional bamboo salt, which comprises:

[0045] S1. Bamboo stalk mineral enrichment and replacement:

[0046] A soluble chloride salt is prepared into a solution with a concentration of 2%, one end of a fresh bamboo stalk is immersed in the soluble chloride salt solution, and the liquid in the vascular bundle of the bamboo stalk is pulled and replaced under the action of a negative pressure device (the negative pressure device disclosed in CN 202410446474.2), and replaced bamboo juice and nutritionally enhanced bamboo stalk are obtained after the replacement is completed;

[0047] S2. Bamboo tube processing:

[0048] Processing the nutritionally enhanced bamboo stalk obtained in S1 into a bamboo tube with a length of 50-100 cm, wherein the bamboo tube contains more than one bamboo node, only the bottom bamboo node is retained, and other bamboo nodes are removed, and the inner diameter of the bamboo tube is 15-20 cm;

[0049] Note: The order of S1 and S2 can also be adjusted. The harvested bamboo can be directly processed into bamboo tubes, and then a negative pressure device is used for mineral enrichment and replacement.

[0050] S3. Preparation of bamboo leaf pulp

[0051] Pick bamboo leaves, dry and crush them to obtain bamboo leaf powder for later use. When used, add water, stir at high speed and filter evenly to obtain bamboo leaf slurry; the mass ratio of water to bamboo leaf powder in the bamboo leaf slurry is 1:2;

[0052] S4, Baked with Nutritious Bamboo Salt

[0053] Spray water on the raw salt to adjust the water content of the salt to 9%; first add bamboo leaf slurry into the nutritionally enhanced bamboo tube, the height of the bamboo leaf slurry at the bottom of the nutritionally enhanced bamboo tube is 5% of the height of the bamboo tube, then fill the salt with a water content of 9% into the nutritionally enhanced bamboo tube obtained in S2, and then bake it with fuel to obtain the following Figure 1 The salt column shown is crushed to obtain Figure 2 The roasted fortified nutritional bamboo salt shown.

[0054] In this embodiment, the bamboo tube bottom is heated first, carbonized and burned first, and heated for the longest time during the heating process, and the rising characteristics of the liquid in the bamboo material during the vaporization process are utilized to add bamboo branch and leaf slurry rich in specific mineral salts to the bottom of the bamboo tube. The slurry temperature rises to achieve the local hot steam mineral leaching effect, and merges with the salt in the center of the bamboo tube as the water evaporates upward. The bamboo wall can radiate to the periphery of the salt column through mineral enhancement. Through the coordinated enhancement of the inside and outside, the uneven distribution of minerals caused by the large diameter of the bamboo tube is overcome, and the specific trace elements and alkalinity are strengthened. During the baking process, the bamboo leaf slurry can absorb the heat buffer at the bottom of the bamboo tube, delay the time for the bottom of the bamboo tube to burn through, and increase the strength of the bamboo salt column. The very small amount of ash remaining after the bamboo leaf slurry is baked will naturally separate from the bamboo tube with gravity.

[0055] from Figure 1 It can be seen that the roasted large-diameter salt columns are dense and uniformly grayish white in color. To the naked eye, the crushed roasted enhanced nutritional bamboo salt particles are larger than the original salt, and granular crystals exist after coarse powder.

[0056] In this embodiment, the baking condition in S4 is: baking with pine wood for about 3 hours.

[0057] In this embodiment, the soluble chloride salt in S2 is a mixture of ferric chloride and zinc chloride in a ratio of 1:1; a 2% aqueous solution is prepared. The soluble chloride salt solution contains edible ethanol, and the volume ratio of edible ethanol to the solvent water in the solution is 1:4; the use of ethanol can increase the diffusion quantity and speed of mineral elements, and ethanol also plays a role in the combustion of bamboo tubes.

[0058] In this embodiment, the raw salt is sun-dried sea salt.

[0059] In this embodiment, after the salt in S4 is loaded into the nutrition-fortified bamboo tube, the upper end of the bamboo tube can be sealed with yellow mud, and the yellow mud can be added to the bamboo leaf slurry to enhance the mineral nutrition in the bamboo leaves during the baking process.

[0060] If the nutrient-fortified bamboo tube is left for too long before being filled with salt, and its moisture content is lower than 18%, the nutrient-fortified bamboo tube needs to be sprayed with moisture to increase the moisture content of the bamboo tube.

[0061] This embodiment is suitable for the preparation of bamboo salt from large-diameter bamboo tubes, which increases the uniformity of salt column quality and is more adaptable to bamboo tube diameters. Large-diameter bamboo tubes can hold more salt and have a higher roasting output. The efficiency of traditional bamboo salt filling can be increased by 1-20 times, and the number of bamboo tubes used can be reduced.

[0062] Example 2

[0063] The preparation method of this embodiment is the same as that of embodiment 1, except that the water content of the raw salt is adjusted in S4 using the replacement bamboo juice obtained in S1.

[0064] Comparative Example 1

[0065] The traditional baking method is adopted, water is sprayed on the raw salt to adjust the moisture content of the salt to 9%, and then the salt is densely filled into a bamboo tube and baked with pine wood to obtain the first-baked bamboo salt. The above process is repeated 3 times to obtain the third-baked bamboo salt.

[0066] The index values ​​and mineral element contents of the once-roasted enhanced nutritional bamboo salt prepared in Examples 1 and 2 and the triple-roasted bamboo salt prepared in Comparative Example 1 are shown in Table 1.

[0067] Table 1 Performance of bamboo salt prepared in Examples 1, 2 and Comparative Example 1

[0068]

[0069]

[0070] The data in Table 1 show that the iron and zinc content of the bamboo salt baked after the bamboo tube mineral strengthening treatment in Example 1 and Comparative Example 1 is greatly increased, and the sodium chloride content is reduced. Spraying the replaced bamboo juice obtained in S2 on the raw salt can improve the mineral content of the bamboo salt as a whole.

[0071] Example 3

[0072] This embodiment prepares bamboo salt according to the preparation method in Example 1, except that, according to the demand, the baking process in S4 in Example 1 can be repeated 3 times, and the enhanced nutritional bamboo salt obtained in the first baking is used as the raw salt in the next baking, and finally the multi-baked enhanced nutritional bamboo salt is obtained. Finally, the triple-baked enhanced nutritional bamboo salt is obtained.

[0073] In this embodiment, the prepared new bamboo salt is off-white in color and is configured into a 0.9% saline solution with a pH of 10.12. Its physical and chemical properties and heavy metal content meet national standards, and the content of mineral elements such as iron and zinc is significantly higher than that of bamboo salt baked by traditional methods.

[0074] Figure 5 This is a SEM picture of the raw sun-dried sea salt in the present invention. Figure 6 This is a SEM picture of the crushed three-baked enhanced nutritional bamboo salt prepared in Example 3 of the present invention. After 50 times magnification, after three bakings, the shape of the bamboo salt crystals becomes irregular, the crystal particle size becomes significantly smaller, and the solubility and permeability of the bamboo salt are enhanced.

[0075] Example 4

[0076] This embodiment discloses a method for preparing fortified nutritional bamboo salt, which comprises:

[0077] S1. Bamboo stalk mineral enrichment:

[0078] A 3% soluble chloride solution is loaded into living bamboo and newly cut bamboo with leaves, and nutrition-enhanced bamboo stalks are obtained after cutting. The enrichment method of living bamboo and newly cut bamboo with leaves utilizes the transpiration of bamboo leaves and immerses the roots of newly cut bamboo with leaves into a soluble chloride solution.

[0079] S2. Bamboo tube processing:

[0080] Processing the nutritionally enhanced bamboo stalk obtained in S1 into a nutritionally enhanced bamboo tube with a length of 10-100 cm, the inner diameter of the bamboo tube is 6-20 cm, the bamboo tube contains more than one bamboo node, only the bottom bamboo node is retained, and other bamboo nodes are removed;

[0081] S3. Preparation of bamboo leaf pulp

[0082] Pick bamboo leaves, dry and crush them to obtain bamboo leaf powder for later use. When using, add water and stir evenly at high speed to obtain bamboo leaf slurry; the mass ratio of water to bamboo leaf powder in the bamboo leaf slurry is 1:3;

[0083] S4, Baked with Nutritious Bamboo Salt

[0084] The replaced bamboo juice is sprayed on the raw salt to adjust the moisture content in the salt to 15%, and bamboo leaf slurry is first added into the nutritionally enhanced bamboo tube, the height of the bamboo leaf slurry at the bottom of the nutritionally enhanced bamboo tube is 2.5% of the height of the bamboo tube, and then the salt with a moisture content of 15% is densely filled into the nutritionally enhanced bamboo tube obtained in S2, and the mouth of the bamboo tube is sealed with yellow mud, and then baked with fuel for about 2-3 hours to obtain a salt column, which is crushed to obtain bamboo salt.

[0085] If the nutrient-fortified bamboo tube is left for too long before being filled with salt, and its moisture content is lower than 18%, the nutrient-fortified bamboo tube needs to be sprayed with moisture to increase the moisture content of the bamboo tube.

[0086] Generally, 200-500 mL of bamboo juice is replaced per kilogram of bamboo tube. The soluble chloride salt solution may contain edible ethanol, and the volume ratio of edible ethanol to the solvent water in the solution is 3:4. The use of edible ethanol can increase the melting and diffusion quantity and speed of mineral elements, and edible ethanol also plays a role in assisting the combustion of bamboo tubes.

[0087] In this embodiment, the soluble chloride salt in S2 is a mixture of magnesium chloride, calcium chloride and potassium chloride in a ratio of 1:1:1. The soluble chloride salt can also be one, two, three, four or five of ferric chloride, zinc chloride, magnesium chloride, calcium chloride and potassium chloride, or a mixture of two of magnesium chloride, calcium chloride and potassium chloride and one of ferric chloride and zinc chloride, or a mixture of one of magnesium chloride, calcium chloride and potassium chloride and ferric chloride and zinc chloride.

[0088] In this embodiment, the following method can also be used in S1 to enrich soluble chloride salts in bamboo stalks: injecting a soluble chloride salt solution into the bamboo stalks of living bamboo; specifically, the method disclosed in ZL 201610802328.4 can be used, and the immersion liquid disclosed therein corresponds to the soluble chloride salt in this embodiment.

[0089] In this embodiment, the prepared new bamboo salt is off-white in color and is configured into a 0.9% saline solution with a pH of 10.35. The physical and chemical properties and heavy metal content meet the national standard requirements, and the content of mineral elements such as magnesium, calcium and potassium is more than twice that of bamboo salt roasted by traditional methods.

[0090] This application conducted a test on the absorption of soluble chloride salts by bamboo branches, such as Figure 3As shown, from left to right are magnesium chloride aqueous solution (concentration 3%), copper chloride aqueous solution (concentration 3%), ferric chloride aqueous solution (concentration 3%), potassium chloride aqueous solution (concentration 3%), sodium chloride aqueous solution (concentration 10%), sodium chloride aqueous solution (concentration 5%), sodium chloride aqueous solution (concentration 3%), sodium chloride aqueous solution (concentration 1%), sodium chloride aqueous solution (concentration 0.5%). After transpiration of bamboo leaves, magnesium chloride, copper chloride, ferric chloride, potassium chloride and sodium chloride are all enriched on bamboo branches to a certain extent, especially the enrichment of monovalent metal elements is higher, and the enrichment in chlorides with a concentration of 0.5-3% is better.

[0091] Example 5

[0092] This embodiment discloses a method for preparing large-diameter fortified selenium-rich nutritious bamboo salt, which is the same as the method disclosed in this embodiment 1, except that selenium-rich edible powder with a selenium content greater than 500 ug / g is mixed with raw salt to obtain a salt mixture with a selenium content of 20 mg / kg, and the raw salt in S4 in Example 1 is replaced by the salt mixture.

[0093] When choosing bamboo tubes, choose large-diameter bamboo tubes with an inner diameter greater than 10 cm. The temperature inside the bamboo tubes during the baking process is less than 600°C, which is suitable for direct baking to prepare selenium-rich nutritious bamboo salt.

[0094] In the present embodiment, the selenium-rich edible powder may be selenium-rich mushroom powder, selenium-rich fruit powder, selenium-rich vegetable powder, or selenium-rich malt powder; in the present embodiment, the selenium-rich edible powder is specifically selenium-rich mushroom powder.

[0095] In this embodiment, the prepared new bamboo salt is grayish white in color and is configured into a 0.9% saline solution with a pH of 10.35. The physical and chemical properties and heavy metal content meet the requirements of national standards. The content of mineral elements such as iron and zinc is more than twice that of bamboo salt roasted by traditional methods, and the selenium content can reach 5-10 mg / kg.

[0096] Figure 7 The large-diameter selenium-rich nutritious bamboo salt prepared in this embodiment is darker in color due to the addition of selenium-rich mushroom powder. During the baking process, the selenium-rich mushroom powder turns to gray, which increases the selenium element.

[0097] Example 6

[0098] In Example 1, after S4 is roasted, a salt column is obtained, which is crushed and then added with bamboo leaf ethanol / water extract to obtain a roasted bamboo flavor enhanced nutritional bamboo salt with a moisture content of 1% (0.5%, 1.5%, 2%, 3%, etc.)

[0099] The specific preparation method of the bamboo leaf ethanol / water extract is as follows: the bamboo leaves are dried and crushed, the bamboo leaves are mixed with water / ethanol in a mass ratio of 1:20, ultrasonicated at 60°C for 30 minutes, and centrifuged to obtain the bamboo leaf ethanol / water extract. The content of the extract in the bamboo leaf ethanol / water extract is 15%. Depending on the different types of bamboo leaves and the water / ethanol usage ratio, the content of the extract in the bamboo leaf ethanol / water extract is generally 3-20%.

[0100] In this embodiment, the prepared new bamboo salt is off-white in color, has a bamboo fragrance, is configured into a 0.9% saline solution, has a pH of 9.86, and its physical and chemical properties and heavy metal content meet national standards. The content of mineral elements such as iron and zinc is more than twice that of bamboo salt roasted by traditional methods.

[0101] Example 7

[0102] This embodiment discloses a method for preparing fortified nutritional bamboo salt, comprising:

[0103] S1. Bamboo tube processing:

[0104] Processing the harvested fresh bamboo into bamboo tubes with a length of 10-100 cm and an inner diameter of 10-20 cm, and only retaining the bottom bamboo nodes in the bamboo tubes;

[0105] S2. Bamboo tube mineral enrichment and replacement:

[0106] Calcium chloride is prepared into a 0.5% calcium chloride solution, a hole is punched on the top of a fresh bamboo tube, and the calcium chloride solution is injected, and a nutritionally enhanced bamboo tube is obtained after 24 hours;

[0107] S3. Preparation of bamboo leaf pulp

[0108] Pick bamboo leaves, dry and crush them to obtain bamboo leaf powder for later use. Add water to the bamboo leaf powder and stir evenly to obtain bamboo leaf slurry; the mass ratio of water to bamboo leaf powder in the bamboo leaf slurry is 1:1;

[0109] S4, Baked with Nutritious Bamboo Salt

[0110] Spray water on the raw salt until the water content is 3%, first add bamboo leaf slurry into the nutritionally enhanced bamboo tube, the height of the bamboo leaf slurry at the bottom of the nutritionally enhanced bamboo tube is 1% of the height of the bamboo tube, then densely fill the salt with a water content of 3% into the nutritionally enhanced bamboo tube obtained in S2, and then use fuel to bake it to obtain a salt column, which is crushed to obtain a baked enhanced nutritional bamboo salt; repeat the above steps 3 times to obtain a triple baked enhanced nutritional bamboo salt.

[0111] After the S4 salt is loaded into the nutrient-fortified bamboo tube, the mouth of the bamboo tube can be sealed with yellow mud. The yellow mud can be added to the bamboo leaf slurry to enhance the mineral nutrition in the bamboo leaves during the baking process.

[0112] If the nutrient-fortified bamboo tube is left for too long before being filled with salt, and its moisture content is lower than 18%, the nutrient-fortified bamboo tube needs to be sprayed with moisture to increase the moisture content of the bamboo tube.

[0113] In this embodiment, the raw salt is sun-dried sea salt.

[0114] In this embodiment, the fuel in S4 is a fuel processed from bamboo raw materials, and the method for processing the fuel from bamboo raw materials is: crushing the bamboo raw materials to obtain bamboo crushed materials, drying to a moisture content of 10% (5%, 8%, 12% or 15% can also be selected) and then sieving, pressing the bamboo crushed materials into hollow rods A, and further processing the hollow rods A into bamboo charcoal; adding pine needle powder and rosin or natural rosin to the bamboo crushed materials, pressing them into hollow rods C, and using the hollow rods C as enhanced biomass fuel; 1.0-1.2g / cm 3 The bamboo raw material can be any part of bamboo that is free of heavy metal pollution and does not contain soil, such as bamboo leaves, bamboo indus shells, bamboo roots, bamboo branches, and bamboo stalks, or it can be the residue after felled bamboo is processed into bamboo tubes.

[0115] The fortified salt in S4 is densely filled into the nutritionally fortified bamboo tube obtained in S2, and then the baking process is specifically as follows: the bamboo tube filled with salt is baked at low temperature for 0.5h (1h, 1.5h or 2h can also be selected) using bamboo machine charcoal to make the bamboo tube lose water and carbonize, and then the enhanced biomass fuel is used to bake until the bamboo tube burns, and then the bamboo biomass fuel or bamboo machine charcoal is used to continue baking for 2h (1h, 1.5h, 2.5h or 3h can also be selected) to form a dense salt column, and the bamboo salt column is crushed to obtain a baked bamboo salt; the fuel processed from bamboo raw materials can be recycled.

[0116] In this embodiment, the prepared new bamboo salt is off-white in color and is configured into a 0.9% saline solution with a pH of 9.75. The physical and chemical properties and heavy metal content meet the national standards. The content of mineral elements such as iron and zinc is more than twice that of bamboo salt baked by traditional methods.

[0117] The water used in the above embodiments is all edible water, such as purified water, mineral water, well water, etc., preferably, mineral water.

[0118] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing fortified nutritional bamboo salt, characterized in that: The method is: S1. Mineral enrichment of bamboo stalks / tubes: Loading a soluble chloride solution into living bamboo, newly cut bamboo with leaves or cut bamboo stalks to obtain nutritionally enhanced bamboo stalks / bamboo tubes; the concentration of the soluble chloride solution is 0.5-3%; S2. Bamboo tube processing: The nutritionally enhanced bamboo stalk obtained in S1 is processed into a nutritionally enhanced bamboo tube with a length of 10-100 cm, the inner diameter of the bamboo tube is 6-20 cm, the bamboo tube contains more than one bamboo node, only the bottom bamboo node is retained, and other bamboo nodes are removed; S3, Baking with Nutritious Bamboo Salt: Water is sprayed on the raw salt until the water content in the salt is 3-15%, and then densely filled into the nutritionally enhanced bamboo tube, and then roasted with fuel to obtain a roasted enhanced nutritional bamboo salt.

2. The preparation method according to claim 1, characterized in that: The inner diameter of the bamboo tube described in S1 is 10-20 cm.

3. The preparation method according to claim 1, characterized in that: The soluble chloride salt in S1 is one or a mixture of two or more of ferric chloride, magnesium chloride, zinc chloride, calcium chloride and potassium chloride.

4. The preparation method according to claim 1 or 3, characterized in that: The soluble chloride salt solution also contains edible ethanol, and the volume ratio of edible ethanol to the solvent water in the solution is 1-3:

4.

5. The preparation method according to claim 1, characterized in that: Before the salt in S3 is loaded into the nutritionally fortified bamboo tube, bamboo leaf slurry is first added into the nutritionally fortified bamboo tube, and the height of the bamboo leaf slurry at the bottom of the nutritionally fortified bamboo tube is 1-5% of the height of the bamboo tube; the preparation method of the bamboo leaf slurry is: bamboo leaf powder is added to water and stirred evenly to obtain bamboo leaf slurry; the mass ratio of water to bamboo leaf powder in the bamboo leaf slurry is 1:1-3.

6. The preparation method according to claim 1, characterized in that: The fuel in S3 can be fuel processed from pine wood, miscellaneous wood or bamboo raw materials.

7. The preparation method according to claim 6, characterized in that: The method for processing bamboo raw materials into fuel is as follows: the fuel processed from bamboo raw materials is specifically: the bamboo raw materials are crushed to obtain bamboo crushed materials, dried to a moisture content of 5-15%, and then pressed into hollow rods A as biomass fuel, and the hollow rods A are further processed into bamboo charcoal; pine leaf powder and rosin or natural rosin are added to the bamboo crushed materials, and pressed into hollow rods C, and the hollow rods C are used as enhanced biomass fuel; The specific baking process in S4 is: use bamboo machine charcoal to bake the bamboo tube filled with salt at low temperature for 0.5-2h to make the bamboo tube lose water and carbonize, then use enhanced biomass fuel to bake until the bamboo tube burns, and then use bamboo biomass fuel or bamboo machine charcoal to continue baking for 1-3h to form a dense salt column, and crush the bamboo salt column to obtain a baked bamboo salt.

8. The preparation method according to claim 1, characterized in that: The baking process in S3 is repeated for multiple times, and the enhanced nutritional bamboo salt obtained in the previous baking is used as the raw salt for the next baking, and finally the multi-baked enhanced nutritional bamboo salt is obtained.

9. The preparation method according to claim 1, characterized in that: When bamboo salt is roasted in bamboo tubes with an inner diameter greater than 12 cm, selenium-rich edible powder is added to the raw salt in S4 before spraying water. The amount of selenium-rich edible powder added is calculated based on a selenium content of 20 mg / kg in the final mixture.

10. The preparation method according to claim 1, characterized in that: The soluble chloride solution in S1 is loaded into the cut bamboo stalks in the following manner: one end of the fresh bamboo stalk is immersed in the soluble chloride solution, and the liquid in the vascular bundle of the bamboo stalk is pulled and replaced under the action of negative pressure, and replaced bamboo juice and nutritionally enhanced bamboo stalks are obtained after the replacement is completed; The replaced bamboo juice partially or completely replaces the water in S3, is sprayed on the raw salt, and the water content in the salt is adjusted to 3-15% to obtain the fortified salt, which is then densely filled into the nutritionally fortified bamboo tube obtained in S2, and then baked with fuel to obtain a baked fortified nutritional bamboo salt; The soluble chloride solution is loaded into the living bamboo and the newly cut bamboo with leaves in the following manner: the enrichment method of the living bamboo and the newly cut bamboo with leaves utilizes the transpiration of bamboo leaves, immerses the roots of the newly cut bamboo with leaves into the soluble chloride solution, or injects the soluble chloride solution into a bamboo tube section near the root of the living bamboo.

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