CN109182609B - Bentonite method sugarcane juice sulfur-free clarification process - Google Patents
Bentonite method sugarcane juice sulfur-free clarification process Download PDFInfo
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- C13B20/00—Purification of sugar juices
- C13B20/12—Purification of sugar juices using adsorption agents, e.g. active carbon
- C13B20/123—Inorganic agents, e.g. active carbon
Abstract
The invention relates to a sulfur-free clarification process of sugarcane juice by a bentonite method, wherein the sugarcane primary-pressing juice is pre-ashed by adopting alkaline clay, and the pH is adjusted to the required condition under the condition of stirring; then adding a proper amount of hydrogen peroxide and vitamin C modified bentonite in sequence; stirring for a certain time to fully perform oxidation, decoloration and adsorption, filtering the sugarcane juice mixed solution to obtain a filtrate, namely the sugarcane clear juice, and performing secondary decoloration on the obtained clear juice by adopting a chitosan/bentonite compound and filtering to obtain the final clear juice; and filtering to obtain a filter cake which is bentonite rich in organic matters, and removing the filter cake to an organic fertilizer workshop to prepare the organic fertilizer. The process can realize the clarification and the decoloration of the sugarcane juice at a lower temperature, overcomes the adverse effects of the traditional high-temperature clarification method, has few side reactants, low energy consumption, no sulfur in the process, good clarification effect and lower cost, uses the additive obtained by modifying and compounding natural minerals, is natural and nontoxic, and thoroughly decomposes the hydrogen peroxide by the vitamin C modified bentonite without residues.
Description
Technical Field
The invention relates to a bentonite-method sugarcane juice sulfur-free clarification process, and belongs to the field of sugar juice clarification and decoloration.
Background
The sugarcane is squeezed to extract the juice to obtain sugarcane juice (sugarcane juice for short), which is composed of multiple componentsThe typical colloidal solution of (a) is quite complex in composition and properties. In addition to sucrose, cane juice contains reducing sugars, various polysaccharides, proteins, various amino acids and amides, organic acids, pectins and other colloids, cane fat and cane waxes, various pigments, and miscellaneous cane trash and slime. The traditional sugar production process of the sugarcane comprises the working procedures of extracting juice, clarifying, evaporating, crystallizing, separating honey, drying and the like. Wherein the clarification process is the most key link in the sugar making process and aims to remove non-sugar such as colloid, pigment and the like in the cane juice. The cane juice clarifying effect directly influences the quality of cane sugar products and the sugar recovery rate, and meanwhile, the consumption of the clarifying process accounts for a large proportion in the whole sugar making process, so that the cane juice clarification is always the focus of attention of the sugar making industry and is also a difficult point of the sugar making industry. China is the third major sugar-producing country in the world, the annual white sugar production is about 1000 million tons, and several hundreds of sugar cane sugar-making enterprises exist in the whole country. At present, the domestic sugar cane sugar production process mainly comprises a lime method, a sulfurous acid method and a carbonic acid method according to different clarification processes, and the clarification treatment steps in the method mainly comprise three processes: heating cane juice, adding a clarifying agent, and separating precipitates. Most domestic cane sugar factories adopt a sulfurous acid method clarification process, and sulfur dioxide (SO) is added in the process2) Lime milk and phosphoric acid to form calcium sulfite sediment and calcium phosphate sediment so as to adsorb and remove colloid and pigment in the sugar juice, and the adsorption capacity of the calcium sulfite and calcium phosphate sediment on the colloid pigment directly influences the clarification and decoloration effects. However, SO is present during the sulfitation neutralization process of the traditional sulfitation process2Incomplete absorption, excessive fouling and escaped SO2The most important is that the SO in the clear juice is caused by incomplete neutralization reaction and insufficient separation of calcium sulfite2High residual quantity of SO without formation of calcium sulfite2Will inevitably remain in the clear juice, will be absorbed and wrapped by the sucrose crystals and enter the white granulated sugar crystals in the subsequent boiling process, resulting in the SO-containing of the sugar2Affecting the safety of the white granulated sugar. In addition, in the clarification process by the sulfurous acid method, sugar juice needs to be heated for a second time (about 100 ℃) before entering a sedimentation tank so as to enable free acid in phosphoric acid, sulfurous acid or cane juiceFully reacts with calcium to form denser calcium salt, and coagulates various non-sugar components such as protein and the like to be more compact and firmer so as to ensure clarification effect. However, the high temperature of the process brings about a plurality of side effects, particularly, a plurality of non-sugar parts such as colloid color, pigment and the like in the sugar juice are increased, the quality of the white sugar is directly influenced, and the difficulty of subsequent treatment is caused. Therefore, there is a need for a process for producing sugar from clear juice with increased safety. Therefore, the research or development of a technology which does not use sulfur dioxide and performs clarification at a lower temperature or normal temperature is a development trend of the sugar industry of the sugarcane in the future.
The adsorption method has the advantages of simple and safe operation, simple equipment and the like when being used in the clarification and decoloration process, and is more beneficial to food safety if natural nontoxic materials (such as porous clay, diatomite and the like) are selected as the adsorbent. The bentonite is also called montmorillonite or bentonite, is a natural layered mineral material, and has wide application prospects in various fields. Bentonite has a series of valuable properties such as cation exchange property, water absorption property, expansibility, thixotropy, adsorbability and the like. The bentonite has rich reserves, low price, no toxicity and no pollution. The bentonite reserves in China are very large, wherein the Guangxi Ningming bentonite deposit is one of domestic super-large ores, the reserves are 6.1 hundred million tons, and the reserves account for 1/4 of the total reserves in China. In order to improve the adsorption capacity of bentonite on organic matters, metal ions and the like, modification treatment is often carried out on the bentonite, common modification methods comprise acid activation modification, physical coating modification, natural polymer modification and the like, the interlayer spacing of the modified montmorillonite is increased, and the adsorption capacity of the bentonite on the metal ions and the organic matters can be effectively enhanced. The Chinese invention patent CN200710027154.X discloses organic acid bentonite and a preparation method thereof, wherein different types of organic acids (such as stearic acid, benzoic acid, gluconic acid and the like) and alkaline bentonite (for short, alkaline clay is prepared by the method of Chinese patent 200510101332. X) are adopted as raw materials, and alkaline calcium bentonite and organic acid react in an organic dehydration solvent and are subjected to water diversion to prepare a series of organic acid bentonite with different functions. The structure of the organic acid bentonite is still the layered structure of the bentonite material, and calcium ions between layers of the organic acid bentonite are combined with organic acid radicals in an ionic bond mode.
Chinese patent 201611249195.9 discloses a compound decolorizer for sugar juice and a method for decolorizing sugar juice, wherein the compound decolorizer is prepared from hydrogen peroxide (hydrogen peroxide, H)2O2) And vitamin C (ascorbic acid), under the action of vitamin C, H2O2The color value of the sugar juice can be greatly reduced, and basically no sulfur dioxide remains. The Chinese invention patent CN200510076751.2 discloses that the bentonite-chitosan flocculant is used for clarifying the mixed juice generated by squeezing and extracting the juice of sugar crop raw materials (sugarcane or sweet sorghum), the bentonite-chitosan flocculant is used for clarifying, flocculating and filtering to obtain the clear juice of sugar crop, the color is yellowish, the clear juice is transparent and clear, each component is in uniform dispersed phase, no impurity or sediment exists, and the clear juice has the original smell of fresh sugar crop. However, if the two methods are used independently, the decoloring method is single, and the price of vitamin C or chitosan is very expensive, so that the clarifying cost of the sugarcane juice is high due to the large use amount.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the process comprises the steps of pre-ashing the sugarcane juice by adopting alkaline clay, sequentially adding a proper amount of hydrogen peroxide and vitamin C modified bentonite for oxidation, decolorization and adsorption, and filtering to obtain clear juice, wherein the clear juice is secondarily decolorized by adopting a chitosan/bentonite compound and is filtered to obtain final clear juice; the process can realize the clarification and the decoloration of the sugarcane juice at a lower temperature, overcomes the adverse effect of the traditional high-temperature clarification method, reduces the clarification cost and has good clarification effect.
The technical scheme for solving the technical problems is as follows: a sulfur-free clarification process of sugarcane juice by a bentonite method comprises the steps of squeezing sugarcane to obtain initial-pressing juice, adjusting the pH value to 5-11 by using alkaline clay under the condition of stirring, sequentially adding hydrogen peroxide and vitamin C modified bentonite for primary adsorption and decoloration, wherein the addition amount of the hydrogen peroxide is calculated by adding 0.025-0.075 mL of hydrogen peroxide into 1mL of the initial-pressing juice, the addition amount of the vitamin C modified bentonite is calculated by adding 2.5-10 mg of vitamin C modified bentonite into 1mL of the initial-pressing juice, the primary adsorption and decoloration time is 30-60 min, and the primary adsorption and decoloration temperature is 30-60 ℃; and after the primary adsorption decoloration is finished, performing primary filtration on the obtained sugarcane juice mixed liquor, wherein the obtained filtrate is sugarcane clear juice, adjusting the pH value of the sugarcane clear juice to be 5-6 under the stirring condition by adopting activated clay, adding the chitosan/bentonite compound into the sugarcane clear juice, performing secondary adsorption decoloration until the decoloration rate reaches over 90 percent, and filtering to obtain the clear juice after the secondary adsorption decoloration is finished, wherein the secondary adsorption decoloration temperature is 30-60 ℃.
In the secondary adsorption and decoloration process, the addition amount of the chitosan/bentonite compound is calculated according to the addition amount of 0.002g to 0.02g of the chitosan/bentonite compound in 1mL of clear juice, and the secondary adsorption and decoloration time is 30 to 40 min.
The alkaline clay is alkaline calcium bentonite prepared by the method in Chinese patent No. 200510101332. X.
The vitamin C modified bentonite is organic acid bentonite prepared by the method in Chinese patent No. 200710027154.X, and the organic acid in the method in the patent No. 200710027154.X adopts ascorbic acid.
The chitosan/bentonite compound is prepared according to the preparation method of the bentonite-chitosan compound flocculant in the Chinese patent with the patent number 200510076751.2.
The filter cake obtained by filtering is bentonite rich in organic matters, and the organic fertilizer is prepared.
In order to overcome the adverse effect of the traditional high-temperature clarification method and reduce the clarification cost, the invention firstly loads vitamin C on alkaline calcium bentonite to obtain vitamin C modified bentonite (the preparation method of the vitamin C modified bentonite refers to Chinese invention patent CN20071002717154. X), and then clarifies sugarcane juice by combining the vitamin C modified bentonite with hydrogen peroxide, wherein the vitamin C modified bentonite promotes H2O2Can adsorb the molecules of the colored substances while rapidly decomposing into hydroxyl free radicals. In addition, in order to increase the adsorption effect, the additive is addedIn the sugarcane juice pre-grey scale section before vitamin C modified bentonite and hydrogen peroxide, alkaline calcium bentonite (namely alkaline clay, prepared by referring to the method of Chinese patent 200510101332. X) is adopted to replace lime, and after the vitamin C modified bentonite and the hydrogen peroxide are added for clarification, the sugarcane juice is simply filtered, so that the clarification and the decoloration of the sugarcane juice at a lower temperature can be realized. The porous bentonite can be changed into a good filter aid in the filtering process, so that the sugarcane juice which has higher viscosity and is difficult to filter becomes easy to filter. And finally, carrying out secondary decolorization on the clear juice by adopting a chitosan/bentonite compound until the decolorization rate reaches more than 90%, and filtering to obtain the final clear juice.
The principle of the invention is as follows:
bentonite is a 2: 1 layered phyllosilicate clay whose unit cell is composed of two layers of silicon-oxygen tetrahedra sandwiching a layer of aluminum-oxygen octahedra, and oxygen atoms shared between the tetrahedra and octahedra form a highly ordered quasi-two-dimensional sheet. The close-packed structure of tetrahedron and octahedron has ordered lattice arrangement, layer thickness of the whole structure sheet is about 1nm, length and width of the whole structure sheet is about 100nm, and the structure sheet has very high rigidity and no slippage between layers. Among tetrahedra and octahedra, the high valence silicon ion (Si)4+) And aluminum ion (A1)3+) Can be substituted by other low valent cations (e.g. Mg)2+、Fe2+) The displacement, and therefore the sheet, is negatively charged and can adsorb metal ions in the medium to neutralize the negatively charged metal ions. Therefore, the bentonite has a series of valuable characteristics such as cation exchange property, water absorption property, expansibility, thixotropy, adsorbability and the like. The interlayer spacing of the modified bentonite is increased, and the adsorption capacity of the bentonite on metal ions and organic matters can be effectively enhanced. In the process of cane juice clarification, the non-sugar in cane juice is adsorbed and occluded, thereby achieving the purpose of strengthening clarification under the condition of low temperature. The bentonite modified by vitamin C has interlaminar calcium ions ionically bonded with organic acid (ascorbic acid) radicals. The principle that vitamin C modified bentonite is combined with hydrogen peroxide to clarify sugarcane juice is as follows: vitamin C and H in vitamin C modified bentonite2O2Reaction takes place to promote H2O2Rapidly decomposed into hydroxyl free radicals, and simultaneously the vitamin C modified bentonite can be adsorbedAnd removing the molecules of the color substances.
In order to enhance the adsorption effect on non-sugar in the cane juice, at the pre-liming stage of the cane juice before decoloration and clarification, alkaline calcium bentonite (namely alkaline clay, prepared by referring to the method of Chinese patent 200510101332. X) is adopted to replace lime to adjust the pH value of the cane juice and adsorb and remove about 20 percent of colored substances.
After the clarification treatment by adding vitamin C modified bentonite and hydrogen peroxide, the mixed sugarcane juice is filtered, and the clarification and the decoloration of the sugarcane juice at a lower temperature can be realized. The porous bentonite becomes a good filter aid in the filtering process, so that the filtering process of the sugarcane juice which is high in viscosity and difficult to filter becomes very easy. The filter cake is bentonite rich in organic matters and is an excellent raw material for producing organic fertilizers.
And finally, carrying out secondary decolorization on the clear juice by adopting a chitosan/bentonite compound until the decolorization rate reaches more than 90%, and filtering to obtain the final clear juice.
The application of the method of the invention has the following advantages:
(1) the cane juice is clarified at a lower temperature, the cane juice does not need to be heated to a high temperature, side reactants are few, and the energy consumption is low.
(2) The additive is obtained by modifying and compounding natural minerals, is natural and nontoxic, and can completely decompose hydrogen peroxide by vitamin C modified bentonite without residue.
(3) Because the microstructure of the bentonite is a porous layered substance, the bentonite can be used as a good filter aid, the liquid-solid separation can be realized by using a conventional filtering method, and the problems of high viscosity and difficult direct filtration of the sugarcane juice are solved.
(4) Short flow, simple operation and no sulfur in the process.
(5) The bentonite with filter cakes rich in organic matters can be used as an organic fertilizer and is a good soil modifier.
The technical characteristics of a bentonite-method sugarcane juice sulfur-free clarification process are further described in the following by combining the attached drawings and examples.
Drawings
FIG. 1: the invention relates to a process flow chart.
Detailed Description
Description of the flow: the sugarcane is pressed to obtain initial pressed juice, then is pre-ashed by alkaline clay, and the pH is adjusted to the required condition under the condition of stirring; then adding a proper amount of hydrogen peroxide and vitamin C modified bentonite in sequence; stirring for a certain time to fully perform oxidation decoloration and adsorption, filtering the sugarcane juice mixed solution to obtain filtrate which is the sugarcane clear juice, adjusting the pH value of the sugarcane clear juice to be 5-6 under the stirring condition by adopting activated clay, adding the chitosan/bentonite compound into the sugarcane clear juice to perform secondary adsorption decoloration until the decoloration rate reaches more than 90%, evaporating and concentrating the obtained clear juice, and finally crystallizing and separating honey to obtain the finished product white sugar. And filtering to obtain a filter cake which is bentonite rich in organic matters, and removing the filter cake to an organic fertilizer workshop to prepare the organic fertilizer.
Example 1: adjusting the pH value of 40mL of cane juice initial-pressing juice to 5-11 by using alkaline clay, and sequentially adding 2mLH2O2And 0.3g of vitamin C modified bentonite is subjected to primary decolorization, the reaction temperature is 30 ℃, the reaction time is 30min, the decolorization rate of the filtered clear juice is 60-70%, activated clay is adopted to adjust the pH value of the sugarcane clear juice to be 5-6 under the stirring condition, a chitosan/bentonite compound is adopted to perform secondary decolorization, the secondary decolorization temperature is 30-60 ℃, the secondary decolorization is carried out until the decolorization rate is more than 90%, and the final clear juice is obtained after filtration.
Example 2: regulating the pH value of the sugarcane juice to 5-11 by using alkaline clay for 40mL of sugarcane juice initial-pressing juice, and sequentially adding 2mL of H2O2And 0.3g of vitamin C modified bentonite, reacting for 30min at the reaction temperature of 30-60 ℃, filtering to obtain clear juice with the decolorization rate of 54-71%, adjusting the pH value of the sugarcane clear juice to 5-6 by adopting activated clay under the stirring condition, performing secondary decolorization by adopting a chitosan/bentonite compound, performing secondary decolorization at the secondary decolorization temperature of 30-60 ℃ until the decolorization rate is more than 90%, and filtering to obtain the final clear juice.
Example 3: regulating the pH value of the sugarcane juice to 5-11 by using alkaline clay for 40mL of sugarcane juice initial-pressing juice, and sequentially adding 2mL of H2O20.3g of vitamin C modified bentonite, the reaction temperature is 50 ℃, and the reaction time is as follows: 30-60 min laterAnd (3) decoloring the filtered clear juice by 57-72%, adjusting the pH value of the sugarcane clear juice to 5-6 by adopting activated clay under the condition of stirring, performing secondary decoloring by adopting a chitosan/bentonite compound, performing secondary decoloring at the temperature of 30-60 ℃ until the decoloring rate reaches more than 90%, and filtering to obtain the final clear juice.
Example 4: regulating the pH value of the sugarcane juice to 5-11 by using alkaline clay for 40mL of sugarcane juice initial-pressing juice, and sequentially adding 2mL of H2O20.1g to 0.4g of vitamin C modified bentonite, the reaction temperature is 50 ℃, and the reaction time is 50 min. The decolorization rate of the clear juice obtained by filtering is 50-72%, the pH value of the sugarcane clear juice is adjusted to be 5-6 by adopting activated clay under the condition of stirring, secondary decolorization is carried out by adopting a chitosan/bentonite compound, the temperature of the secondary decolorization is 30-60 ℃, and the secondary decolorization is carried out until the decolorization rate reaches more than 90% and filtering is carried out, thus obtaining the final clear juice.
Example 5 initial pressing of 40mL sugarcane juice with alkaline Clay to adjust the pH of the juice to 11, 2mL of H2O20.3g of vitamin C modified bentonite, the reaction temperature is 50 ℃, and the reaction time is 50 min. And (3) the decolorization rate of the filtered clear juice is 70-72%, the pH value of the sugarcane clear juice is adjusted to be 5-6 by adopting activated clay under the condition of stirring, secondary decolorization is carried out by adopting 0.4g of chitosan/bentonite compound, the secondary decolorization temperature is 50 ℃, the secondary decolorization time is 30-40min, and the secondary decolorization is carried out until the decolorization rate of the sugarcane juice reaches more than 90%, and the filtering is carried out to obtain the final clear juice.
In each embodiment of the invention, stirring is required in the primary decoloring and the secondary decoloring processes.
The final clear juice obtained in each embodiment of the invention is evaporated, concentrated and finally crystallized and separated according to a conventional method to obtain the finished product white sugar.
The decolorization rate required by secondary decolorization is determined according to the required white sugar color value, and the higher the decolorization rate is, the higher the white sugar color value is. In order to obtain a better color value of the white sugar, secondary decolorization in each embodiment of the invention can also require that the decolorization rate is more than 95 percent and then filtration is carried out to obtain the final clear juice.
In each embodiment, the filter cake obtained by filtering is bentonite rich in organic matters, and the filter cake can be sent to an organic fertilizer workshop to be prepared into organic fertilizer for use.
The alkaline clay in each embodiment of the invention is alkaline calcium bentonite prepared by the method in Chinese patent No. 200510101332. X. The vitamin C modified bentonite is organic acid bentonite prepared by the method in Chinese patent No. 200710027154.X, and the organic acid in the method in the patent No. 200710027154.X adopts ascorbic acid. The chitosan/bentonite compound is prepared according to the preparation method of the bentonite-chitosan compound flocculant in the Chinese patent with the patent number 200510076751.2. The activated clay is one of modified bentonite, is acidic and can be directly purchased in the market.
Claims (5)
1. A sugar cane juice sulfur-free clarification process by a bentonite method is characterized in that: the method comprises the following steps of squeezing sugarcane to obtain initial-pressing juice, adjusting the pH value to 5-11 by using alkaline argil under the stirring condition, then sequentially adding hydrogen peroxide and vitamin C modified bentonite for primary adsorption and decoloration, wherein the adding amount of the hydrogen peroxide is calculated by adding 0.025-0.075 mL of hydrogen peroxide into 1mL of the initial-pressing juice, the adding amount of the vitamin C modified bentonite is calculated by adding 2.5-10 mg of vitamin C modified bentonite into 1mL of the initial-pressing juice, the primary adsorption and decoloration time is 30-60 min, and the primary adsorption and decoloration temperature is 30-60 ℃; after the primary adsorption decoloration is finished, performing primary filtration on the obtained sugarcane juice mixed liquor, wherein the obtained filtrate is sugarcane clear juice, adjusting the pH value of the sugarcane clear juice to 5-6 by adopting activated clay under the condition of stirring, adding a chitosan/bentonite compound into the sugarcane clear juice, performing secondary adsorption decoloration until the decoloration rate reaches more than 90%, wherein the secondary adsorption decoloration temperature is 30-60 ℃, and filtering to obtain clear juice after the secondary adsorption decoloration is finished;
the alkaline clay is alkaline calcium bentonite, and the preparation method of the alkaline calcium bentonite comprises the following steps: the activated clay and calcium hydroxide or calcium oxide with the activity degree of 150-350 are used as raw materials, and the activated clay and the calcium hydroxide or calcium oxide are mixed and react in the presence of water to obtain the activated clay, and the preparation process comprises the following steps:
(1) mixing activated clay with water of which the mass is 1-6 times that of the activated clay to prepare slurry;
(2) adding calcium hydroxide or calcium oxide with the amount being 20-50% of the mass of the activated clay into the slurry, and uniformly mixing to obtain a reaction raw material;
(3) paving the reaction raw material to a thickness of 3-30 mm, and reacting at 40-80 ℃ for 10-36 hours to obtain reaction clinker;
(4) and washing the reaction clinker with water, removing unreacted calcium hydroxide or calcium oxide, and drying to obtain the alkaline calcium bentonite.
2. The sulfur-free clarification process of sugarcane juice by bentonite method as claimed in claim 1, characterized in that: in the secondary adsorption and decoloration process, the addition amount of the chitosan/bentonite compound is calculated according to the addition amount of 0.002g to 0.02g of the chitosan/bentonite compound in 1mL of clear juice, and the secondary adsorption and decoloration time is 30 to 40 min.
3. The bentonite-process sugarcane juice sulfur-free clarification process according to claim 1 or 2, characterized in that: the vitamin C modified bentonite is organic acid bentonite, the organic acid bentonite adopts alkaline calcium bentonite and organic acid as raw materials, the alkaline calcium bentonite reacts with the organic acid in an organic dehydration solvent and divides water, and the specific process comprises the following steps:
(1) putting alkaline calcium bentonite with anion exchange capacity of 0.5-3 mmol/g and granularity of 60-400 meshes into an organic dehydration solvent with the amount of 5-30 times of the mass of the alkaline calcium bentonite, heating to boil and maintaining the boiling state, and returning the organic dehydration solvent in steam generated by boiling to a reaction system after condensation and water separation;
(2) uniformly adding organic acid with the amount of 10-60% of the mass of the alkaline calcium bentonite within 0.5-2 hours, and continuously stirring for reaction and water separation for 1-6 hours after the acid is added;
(3) filtering the reaction solution, washing and drying a filter cake to obtain organic acid bentonite;
the organic acid in the method adopts ascorbic acid;
the organic dehydration solvent is one or more than one of alkane, aromatic hydrocarbon and alcohol, wherein the alkane is one or more than one of n-hexane, cyclohexane and octane, the aromatic hydrocarbon is one or more than one of benzene, toluene and xylene, and the alcohol is one or more than one of methanol, ethanol, propanol and butanol.
4. The bentonite-process sugarcane juice sulfur-free clarification process according to claim 1 or 2, characterized in that: the preparation method of the chitosan/bentonite compound comprises the following steps: slowly dissolving 20g of chitosan with the deacetylation degree of 90% in a citric acid solution with the volume fraction of 10% to prepare a 1.0% chitosan solution; mixing 1.0% chitosan solution and modified bentonite according to the proportion of 50mL to 40g, and blending into bentonite-chitosan paste; and (3) placing the bentonite-chitosan paste in a 60 ℃ forced air drying oven, drying, and grinding into a powdery composite flocculant for later use.
5. The bentonite-process sugarcane juice sulfur-free clarification process according to claim 1 or 2, characterized in that: filter cakes obtained by the first adsorption, decoloration and filtration and the second adsorption, decoloration and filtration are bentonite rich in organic matters, and the organic fertilizer is prepared.
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