Colored biomass silicon dioxide particles with low metal content and preparation method of colored biomass silicon dioxide particles

Abstract

The biomass silicon dioxide colorful particles with low metal content are bright in color and high in purity, can be widely applied to toothpaste as friction particles or can be widely applied to cosmetics such as massage cream and facial cleanser as massage particles, and compared with traditional silicon dioxide particles prepared from sand water glass, the biomass silicon dioxide colorful particles with low metal content are very low in content of iron, arsenic, lead and the like, and can be widely applied to cosmetics such as cosmetics. The iron content is lower than 100 ppm, the arsenic content and the lead content are both lower than 1 ppm, and the use safety is better.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass silica, and particularly relates to a biomass silica colored particle with low metal content and a preparation method thereof. Background Art

[0002] Silica colored particles are widely used as friction particles for enhancing the appearance color of toothpaste or massage particles for cosmetics. Their particle size is usually 40 - 120 mesh, and common colors include white, blue, green, pink, etc. These colored particles can increase the appearance color of the toothpaste paste and enhance the visual effect of the appearance. At the same time, they can also improve the friction and cleaning effect of the toothpaste. These colored particles can be used in cosmetic massage creams or facial cleansers to increase the friction and massage effect, enhance the use experience, and assist in achieving the skin care purpose.

[0003] Existing silica colored particles are usually prepared by gel precipitation method using sodium silicate and sulfuric acid in a colored slurry system. The sodium silicate used in this method is usually prepared by reacting quartz sand (sand) with soda ash under high temperature conditions. Due to the limited purity of quartz sand, the iron content of the usually prepared silica colored particles exceeds 100 ppm, and the metal contents such as arsenic and lead also exceed 1 ppm, which may be difficult to meet the usage requirements of high - end toothpaste and cosmetics with high safety usage requirements. In addition, since a colored slurry is used in the preparation process of silica colored particles, and the colored slurry contains a certain amount of surfactant, a large amount of foam will inevitably be generated during the preparation of silica gel precipitation. These foams are very likely to remain in the silica particles and form a white film layer on the particle surface, thus causing uneven particle color visually. Moreover, it is also easy to cause color fading under repeated scratching by a certain external force, which will also have an adverse impact on the color stability. Summary of the Invention

[0004] Aiming at the defects of the above - mentioned prior art, the purpose of the present invention is to provide a biomass silica colored particle with low metal content and a preparation method thereof to solve the problems proposed in the above background art. Biomass silica is a green and environmentally friendly silica derived from natural products, and its silicon source comes from renewable resources such as rice husks or sugarcane bagasse.

[0005] The present invention adopts the following technical solutions to solve the technical problems: The present invention relates to the technical field of biomass silicon dioxide, and in particular to a kind of biomass silicon dioxide colored particles with low metal content and a preparation method thereof, comprising the following steps: step one: preparation of biomass powder: washing, drying and crushing rice husk or bagasse biomass to obtain clean powder of biomass rice husk or bagasse; step two: preparation of clean biomass carbonized ash: carbonizing the clean powder of rice husk or bagasse biomass at high temperature, then adding it to a hydrochloric acid solution for full soaking, and then washing it to neutrality to obtain clean biomass carbonized ash; step three: preparation of biomass sodium silicate solution: reacting the clean biomass carbonized ash with a sodium hydroxide solution under heating conditions to obtain a biomass sodium silicate solution; step four: decolorization of the biomass sodium silicate solution: adding a second Decolorization is carried out in sodium chlorate or hydrogen peroxide to obtain a light-colored or colorless and transparent sodium silicate solution; Step 5: Preparation of biomass silica colored particles: Add color paste to the decolorized biomass sodium silicate solution at room temperature, wherein the color paste includes various color pastes such as red, orange, yellow, blue, green, black, white and their combinations, and after stirring evenly, add sulfuric acid solution dropwise for coprecipitation reaction until silica inorganic gel is precipitated; Step 6: Biomass silica colored gel treatment: The biomass silica gels of various colors are aged, and then the gels are washed, filtered, dried and crushed to obtain biomass silica particles of various colors respectively; finally, the biomass silica colored particles are ball-milled and modified with a stabilizing liquid, and then washed, dried and sieved to obtain biomass silica colored particles with a certain particle size and low metal content.

[0006] Preferably, the biomass silicon dioxide particles in step 6 are further subjected to ball milling modification treatment using a stabilizing liquid; The specific steps are as follows: The biomass silica particles and the stabilizing liquid are mixed and ball-milled in a weight ratio of 5:3, the ball-milling speed is 1000-1500r / min, the ball-milling is performed for 2h, and then the ball-milling is completed, and then washed, dried, and sieved to obtain biomass silica colored particles with a certain particle size and low metal content.

[0007] Preferably, the preparation method of the stabilizing liquid is: S01: mixing silane coupling agent, deionized water and ethanol solvent in a weight ratio of (3-5):5:(4-7) to obtain a silane coupling agent liquid; S02: Mix 4-7 parts of modified sodium alginate, 8-12 parts of silane coupling agent and 1-3 parts of stearic acid, and ball-mill them thoroughly at a ball-milling speed of 1000-1500 r / min for 2 hours to obtain a stable solution.

[0008] Preferably, the silane coupling agent is silane coupling agent KH560.

[0009] Preferably, the preparation method of the modified sodium alginate agent is as follows: S11: Prepare a sodium alginate solution with a mass fraction of 2-5% and a sodium silicate solution with a mass fraction of 4%; S12: Add 2-5 parts of the sodium silicate solution to 4-7 parts of the sodium alginate solution, and then add 1-3 parts of gelatin and mix well to obtain the modified sodium alginate agent.

[0010] Preferably, the rotation speed for sufficient blending is 550-650 r / min, and the blending time is 20-30 min.

[0011] The present invention provides a biomass silica colored particle with low metal content and its preparation method. Compared with the prior art, the present invention has the following beneficial effects: The biomass silica colored particle with low metal content of the present invention uses renewable resources such as rice husks or bagasse as raw materials. These biomass raw materials are treated at high temperature to become biomass carbonized ash, in which the organic matter becomes carbon and most of the inorganic matter is silica; the carbonized ash is treated with hydrochloric acid to further dissolve and remove most of the metal ions, so the content of metals such as iron, arsenic, and lead can be greatly reduced. In the process of preparing the silica colored particle, in order to avoid the influence of the foam generated by the surfactant in the color paste, a stability liquid is used to carry out ball milling modification treatment on the biomass silica particle; because the stability liquid contains silane coupling agent, sodium alginate, gelatin, etc., these components have a certain defoaming effect on the foam generated by the color paste, so that the coloring of the color paste is more uniform; and sodium alginate and gelatin can also form a protective film on the surface of the silica particle, so that the coloring of the color paste is more stable; therefore, using the stability liquid to carry out ball milling modification on the biomass silica colored particle can improve the uniformity of the product color and improve the stability of the product color.

[0012] The biomass silica colored particle with low metal content of the present invention has bright color and high purity. As an appearance-enhancing friction particle, it can be widely used in toothpaste, or as a massage particle, it can be widely used in cosmetics such as massage cream and facial cleanser. Compared with the silica particles prepared by traditional sand water glass, the content of metals such as iron, arsenic, and lead in it is very low, and the use safety is better. Its iron content is less than 100 ppm, lead content is less than 1 ppm, and arsenic content is less than 1 ppm; while for the silica particles prepared by sand water glass, usually its iron content is greater than 100 ppm, arsenic content is greater than 1 ppm, and lead content is greater than 1 ppm. Specific embodiments

[0013] The following describes the technical solutions in the embodiments of the present invention clearly and completely in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0014] A preparation method of biomass silica colored particles with low metal content in this embodiment includes the following steps: Step 1: Preparation of biomass powder; washing, drying, and pulverizing rice husk or bagasse biomass to obtain clean powder of biomass rice husk or bagasse. Step 2: Preparation of biomass carbonized ash; Carbonizing the biomass powder obtained in Step 1; Performing acid treatment on the biomass carbonized ash; treating the obtained carbonized ash with hydrochloric acid to remove metal ions such as iron, arsenic, and lead therein, and washing with clean water until the pH value is neutral. Step 3: Alkaline dissolution of the acid-treated biomass carbonized ash; heating the obtained acid-treated carbonized ash with sodium hydroxide solution at 75 - 100 °C, stirring and reacting for 3 - 6 h to cause the silicon dioxide in the biomass to react with sodium hydroxide to generate sodium silicate, and filtering to remove the biomass carbon to obtain a biomass sodium silicate solution. Step 4: Decolorization of the biomass sodium silicate solution; decolorizing the obtained biomass sodium silicate solution with one of sodium hypochlorite solution or hydrogen peroxide solution to obtain a transparent biomass sodium silicate solution. Step 5: Preparation of biomass silica colored gel; adding color paste solutions including various color pastes such as red, orange, yellow, blue, green, black, white and their combinations to the decolorized biomass sodium silicate solution at room temperature, stirring evenly and then dropping sulfuric acid solution for coprecipitation reaction to obtain biomass silica precipitation gels of various colors. Step 6: Treatment of biomass silica gel; aging the biomass silica gels of various colors, and then washing, filtering, drying, and crushing the gels to obtain biomass silica particles of various colors.

[0015] The biomass silica particles in Step 6 of this embodiment are also subjected to ball milling modification treatment with a stability liquid; The specific operation steps are as follows: Mixing the biomass silica particles and the stability liquid in a weight ratio of 5:3, performing ball milling treatment at a ball milling speed of 1000 - 1500 r / min for 2 h, ending the ball milling, and then washing, drying, and screening to obtain biomass silica colored particles with low metal content and a certain particle size.

[0016] The preparation method of the stabilizing liquid of this embodiment is: S01: mixing silane coupling agent, deionized water and ethanol solvent in a weight ratio of (3-5):5:(4-7) to obtain a silane coupling agent liquid; S02: Mix 4-7 parts of modified sodium alginate, 8-12 parts of silane coupling agent and 1-3 parts of stearic acid, and ball-mill them thoroughly at a ball-milling speed of 1000-1500 r / min for 2 hours to obtain a stable solution.

[0017] The silane coupling agent of this embodiment is silane coupling agent KH560.

[0018] The preparation method of the modified sodium alginate agent of this embodiment is: S11: preparing a sodium alginate solution with a mass fraction of 2-5% and a sodium silicate solution with a mass fraction of 4%; S12: Add 2-5 parts of sodium silicate solution to 4-7 parts of sodium alginate solution, and then add 1-3 parts of gelatin and mix thoroughly to obtain a modified sodium alginate agent.

[0019] The rotation speed for sufficient blending in this embodiment is 550-650r / min, and the blending time is 20-30min.

[0020] This embodiment specifically provides a method for preparing biomass silicon dioxide colored particles with low metal content.

[0021] Example 1. The method for preparing red biomass silicon dioxide particles with low metal content in this embodiment comprises the following steps: Step 1: Preparation of biomass powder: Washing, drying and crushing the rice husk or sugarcane bagasse biomass to obtain clean powder of the biomass rice husk or sugarcane bagasse; Step 2: Preparation of biomass carbonized ash; Carbonizing the biomass powder obtained in step 1; The biomass carbonized ash is treated with acid; the obtained carbonized ash is treated with hydrochloric acid to remove metal ions such as iron, arsenic, and lead, and washed with clean water to a neutral pH value; Step 3: The acid-treated biomass carbonized ash is subjected to alkaline dissolution; the obtained acid-treated carbonized ash is heated with a sodium hydroxide solution at 75°C, and the mixture is stirred for reaction for 3 hours to allow the silicon dioxide in the biomass to react with the sodium hydroxide to generate sodium silicate, and the biomass char is removed by filtration to obtain a biomass sodium silicate solution; Step 4: decolorizing the biomass sodium silicate solution; decolorizing the obtained biomass sodium silicate solution with a sodium hypochlorite bleaching agent solution to obtain a transparent biomass sodium silicate solution; Step 5: Preparation of biomass silica colored gel: adding red color paste solution to the decolorized biomass sodium silicate solution at room temperature, stirring evenly, and then dropping sulfuric acid solution to perform co-precipitation reaction to obtain red biomass silica precipitated gel; Step 6: Biomass silica gel treatment: age the red biomass silica gel, then wash, filter, dry and crush the gel to obtain red biomass silica particles.

[0022] The red biomass silicon dioxide particles in step 6 of this embodiment are also subjected to ball milling modification treatment using a stabilizing liquid; The specific steps are as follows: The red biomass silica particles and the stabilizing liquid are mixed in a weight ratio of 5:3 and ball-milled at a speed of 100 r / min for 2 hours. After the ball milling is completed, the red biomass silica particles with a certain particle size and low metal content are obtained after water washing, drying and sieving.

[0023] The preparation method of the stabilizing liquid of this embodiment is: S01: mixing a silane coupling agent, deionized water and an ethanol solvent in a weight ratio of 3:5:4 to obtain a silane coupling agent liquid; S02: Mix 4 parts of modified sodium alginate, 8 parts of silane coupling agent and 1 part of stearic acid, and ball-mill them thoroughly at a ball-milling speed of 10000 r / min for 2 hours to obtain a stable solution.

[0024] The silane coupling agent of this embodiment is silane coupling agent KH560.

[0025] The preparation method of the modified sodium alginate agent of this embodiment is: S11: preparing 2% by mass sodium alginate solution and 4% by mass sodium silicate solution; S12: Add 2 parts of sodium silicate solution to 4 parts of sodium alginate solution, and then add 2 parts of gelatin and mix thoroughly to obtain a modified sodium alginate agent.

[0026] The rotation speed for sufficient blending in this embodiment is 550 r / min, and the blending time is 20 min.

[0027] Example 2. A method for preparing blue biomass silica particles with low metal content in this embodiment comprises the following steps: Step 1: Preparation of biomass powder: Washing, drying and crushing the rice husk or sugarcane bagasse biomass to obtain clean powder of the biomass rice husk or sugarcane bagasse; Step 2: Preparation of biomass carbonized ash; Carbonizing the biomass powder obtained in step 1; The biomass carbonized ash is treated with acid; the obtained carbonized ash is treated with hydrochloric acid to remove metal ions such as iron, arsenic, and lead, and washed with clean water to a neutral pH value; Step 3: The biomass carbonized ash after acid treatment is subjected to alkaline dissolution; the obtained acid-treated carbonized ash is heated with a sodium hydroxide solution at 100° C. and stirred for reaction for 6 hours to allow the silicon dioxide in the biomass to react with the sodium hydroxide to generate sodium silicate, and the biomass char is removed by filtration to obtain a biomass sodium silicate solution; Step 4: decolorizing the biomass sodium silicate solution; decolorizing the obtained biomass sodium silicate solution with hydrogen peroxide to obtain a transparent biomass sodium silicate solution; Step 5: Preparation of biomass silica colored gel: adding a blue color paste solution to the decolorized biomass sodium silicate solution at room temperature, stirring evenly, and then dropping a sulfuric acid solution to perform a co-precipitation reaction to obtain a blue biomass silica precipitated gel; Step 6: Biomass silica gel treatment: age the blue biomass silica gel, then wash, filter, dry and crush the gel to obtain blue biomass silica particles.

[0028] The biomass silica blue particles in step 6 of this embodiment are also subjected to ball milling modification treatment using a stabilizing liquid; The specific steps are as follows: The blue biomass silica particles and the stabilizing liquid are mixed in a weight ratio of 5:3 and ball-milled at a speed of 1500 r / min for 2 hours. After the ball milling is completed, the blue biomass silica particles with a certain particle size and low metal content are obtained after water washing, drying and sieving.

[0029] The preparation method of the stabilizing liquid of this embodiment is: S01: mixing a silane coupling agent, deionized water and an ethanol solvent in a weight ratio of 5:5:7 to obtain a silane coupling agent liquid; S02: Mix 7 parts of modified sodium alginate, 12 parts of silane coupling agent and 3 parts of stearic acid, and ball-mill them thoroughly at a ball-milling speed of 1500 r / min for 2 hours to obtain a stable solution.

[0030] The silane coupling agent of this embodiment is silane coupling agent KH560.

[0031] The preparation method of the modified sodium alginate agent of this embodiment is: S11: prepare 5% by mass sodium alginate solution and 4% by mass sodium silicate solution; S12: Add 5 parts of sodium silicate solution to 7 parts of sodium alginate solution, and then add 3 parts of gelatin and mix thoroughly to obtain a modified sodium alginate agent.

[0032] The rotation speed for sufficient blending in this embodiment is 650 r / min, and the blending time is 30 min.

[0033] Example 3. A preparation method of biomass silica green particles with low metal content in this embodiment includes the following steps: Step 1: Preparation of biomass powder; cleaning, drying, and pulverizing rice husk or bagasse biomass to obtain clean powder of biomass rice husk or bagasse; Step 2: Preparation of biomass carbonized ash; Carbonizing the biomass powder obtained in Step 1; Performing acid treatment on the biomass carbonized ash; treating the obtained carbonized ash with hydrochloric acid to remove metal ions such as iron, arsenic, and lead therein, and washing with clear water until the pH value is neutral; Step 3: Alkali dissolution of the acid-treated biomass carbonized ash; heating the obtained acid-treated carbonized ash with sodium hydroxide solution at 85 °C, stirring and reacting for 4.5 h to cause the silicon dioxide in the biomass to react with sodium hydroxide to generate sodium silicate, and filtering to remove biomass carbon to obtain a biomass sodium silicate solution; Step 4: Decolorization of the biomass sodium silicate solution; decolorizing the obtained biomass sodium silicate solution with sodium hypochlorite solution to obtain a transparent biomass sodium silicate solution; Step 5: Preparation of biomass silica colored gel; adding green color paste solution to the decolorized biomass sodium silicate solution at room temperature, stirring evenly and then dropping sulfuric acid solution for coprecipitation reaction to obtain green biomass silica precipitate gel; Step 6: Treatment of biomass silica gel; aging the green biomass silica gel, and then washing, filtering, drying, and crushing the gel to obtain green biomass silica particles.

[0034] The biomass silica green particles in Step 6 of this embodiment are also subjected to ball milling modification treatment with a stabilizing liquid; The specific operation steps are as follows: Mixing and ball milling the biomass silica green particles and the stabilizing liquid according to a weight ratio of 5:3, with a ball milling rotation speed of 1250 r / min, ball milling for 2 h, ending the ball milling, and then washing, drying, and screening to obtain biomass silica green particles with a certain particle size and low metal content.

[0035] The preparation method of the stabilizing liquid in this embodiment is as follows: S01: Mixing a silane coupling agent, deionized water, and an ethanol solvent according to a weight ratio of 4:5:5.5 to obtain a silane coupling agent solution; S02: Mix 5.5 parts of modified sodium alginate agent, 10 parts of silane coupling agent solution and 2 parts of stearic acid evenly and ball-mill them sufficiently. The ball-milling speed is 1250 r / min, and ball-mill for 2 h to obtain a stability solution.

[0036] The silane coupling agent in this example is silane coupling agent KH560.

[0037] The preparation method of the modified sodium alginate agent in this example is as follows: S11: Prepare a sodium alginate solution with a mass fraction of 3.5% and a sodium silicate solution with a mass fraction of 4%; S12: Add 3.5 parts of sodium silicate solution to 5.5 parts of sodium alginate solution, and then add 3.5 parts of gelatin and mix well to obtain the modified sodium alginate agent.

[0038] The mixing speed in this example is 600 r / min, and the mixing time is 25 min.

[0039] Comparative Example 1. The difference from Example 1 is that silica red particles are prepared using sodium silicate solution of sand.

[0040] Comparative Example 2. The difference from Example 2 is that silica blue particles are prepared using sodium silicate solution of sand.

[0041] Comparative Example 3. The difference from Example 3 is that silica green particles are prepared using sodium silicate solution of sand.

[0042] Comparative Example 4. The difference from Example 3 is that the modification treatment by ball-milling with the stability solution is not carried out.

[0043] Comparative Example 5. The difference from Example 3 is that the modified sodium alginate agent is not added in the preparation of the stability solution.

[0044] Comparative Example 6. The difference from Example 3 is that the modified sodium alginate agent is replaced by sodium alginate.

[0045] Comparative Example 7. The difference from Example 3 is that gelatin is not added to the modified sodium alginate agent.

[0046] Comparative Example 8. The difference from Example 3 is that deionized water is used instead of sodium silicate solution in the preparation of the modified sodium alginate agent.

[0047] The product performance tests of Examples 1 - 3 and Comparative Examples 1 - 5 are as follows:

[0048] As can be seen from Examples 1 to 3, the iron content in the prepared products is less than 100 ppm, and the arsenic and lead contents are both less than 1 ppm. In Comparative Examples 1 to 3, the iron content in the prepared products is greater than 100 ppm, and the arsenic and lead contents are both greater than 1 ppm.

[0049] As can be seen from Example 3 and Comparative Examples 1-8; under the conditions of scratching, acid corrosion, high and low temperatures, the color retention performance of the product in Example 3 is more excellent; when the stability liquid ball milling is not used for modification treatment in the product, the performance of the product deteriorates significantly. At the same time, when the modified sodium alginate agent is not added in the preparation of the stability liquid, the modified sodium alginate agent is replaced by sodium alginate, the modified sodium alginate agent does not add gelatin, and the sodium silicate solution in the preparation of the modified sodium alginate agent is replaced by deionized water, the performance of the product all shows a deteriorating trend. Only the stability liquid obtained by using the modified sodium alginate agent obtained by the method of the present invention in combination with specific raw materials has the most significant product performance effect. Using other methods instead is not as obvious as the effect of the present invention.

[0050] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0051] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing biomass silica colored particles with low metal content, characterized in that: The following steps are involved: Step 1: Preparation of biomass powder: Washing, drying and crushing the rice husk or sugarcane bagasse biomass to obtain clean powder of the biomass rice husk or sugarcane bagasse; Step 2: Preparation of biomass carbonized ash; Carbonizing the biomass powder obtained in step 1 at high temperature; The biomass carbonized ash is subjected to acid treatment; the obtained carbonized ash is treated with hydrochloric acid to remove metal ions such as iron, arsenic and lead therein, and washed with clean water to a neutral pH value; Step 3: alkaline dissolution of the acid-treated biomass carbonized ash; heating the obtained acid-treated carbonized ash with a sodium hydroxide solution at 75-100°C for dissolution and stirring for 3-6 hours to react the silicon dioxide in the biomass with the sodium hydroxide to generate sodium silicate, filtering to remove the biomass char, washing with water, and obtaining a biomass sodium silicate solution; Step 4: decolorizing the biomass sodium silicate solution; decolorizing the obtained biomass sodium silicate solution with a sodium hypochlorite solution or a hydrogen peroxide solution to obtain a light-colored or colorless and transparent biomass sodium silicate solution; Step 5: Preparation of biomass silica colored gel: adding a color paste solution to the decolorized biomass sodium silicate solution at room temperature, wherein the color paste includes various color pastes such as red, orange, yellow, blue, green, black, white and their combinations, stirring evenly and then dropping sulfuric acid solution to perform a co-precipitation reaction to obtain biomass silica precipitated gels of various colors; Step 6: Biomass silica colored gel treatment: aging the biomass silica gels of various colors, then washing, filtering, drying, and crushing the gels to obtain biomass silica particles of various colors.

2. The method for preparing biomass silica colored particles with low metal content according to claim 1, characterized in that: The biomass silica colored particles in step 6 are also modified by stabilizing liquid ball milling to optimize the uniformity and stability of the product color; The specific steps are as follows: The biomass silica particles and the stabilizing liquid are mixed and ball-milled in a weight ratio of 5:3, the ball-milling speed is 1000-1500r / min, the ball-milling is performed for 2h, and then the ball-milling is completed, and then washed, dried, and sieved to obtain biomass silica colored particles with a certain particle size and low metal content.

3. The method for preparing biomass silica colored particles with low metal content according to claim 2, characterized in that: The preparation method of the stabilizing liquid is: S01: mixing silane coupling agent, deionized water and ethanol solvent in a weight ratio of (3-5):5:(4-7) to obtain a silane coupling agent liquid; S02: Mix 4-7 parts of modified sodium alginate, 8-12 parts of silane coupling agent and 1-3 parts of stearic acid, and ball-mill them thoroughly at a ball-milling speed of 1000-1500 r / min for 2 hours to obtain a stable solution.

4. The method for preparing biomass silica colored particles with low metal content according to claim 3, characterized in that: The silane coupling agent is silane coupling agent KH560.

5. The method for preparing biomass silicon dioxide colored particles with low metal content according to claim 3, characterized in that: The preparation method of the modified sodium alginate agent is: S11: preparing a sodium alginate solution with a mass fraction of 2-5% and a sodium silicate solution with a mass fraction of 4%; S12: Add 2-5 parts of sodium silicate solution to 4-7 parts of sodium alginate solution, and then add 1-3 parts of gelatin and mix thoroughly to obtain a modified sodium alginate agent.

6. The method for preparing biomass silica colored particles with low metal content according to claim 5, characterized in that: The rotation speed for sufficient blending is 550-650r / min, and the blending time is 20-30min.

7. Biomass silica colored particles prepared by the method for preparing biomass silica colored particles with low metal content as claimed in any one of claims 1 to 6.

Images