A method for producing a biomass char

Abstract

The present application relates to a kind of preparation method of biomass charcoal, it relates to biomass charcoal preparation technical field, the raw material of the preparation of biomass charcoal includes the following components: waste bamboo material, coconut shell and Chinese medicine rhizome dregs;The Chinese medicine species of the Chinese medicine rhizome dregs includes at least one of ginseng, panax notoginseng, angelica, rhubarb, rehm, kuhnhauptseng, codonopsis, atractylodes, bupleurum, salvia miltiorrhiza, atractylodes, isatis root and north saussurea.The biomass charcoal provided in the present application uses waste bamboo material, coconut shell and Chinese medicine rhizome dregs as raw material, and the biomass charcoal with low phosphorus content, low titanium content and high specific resistance is prepared, which can be used as reducing agent in the production of high-purity ferrosilicon.Meanwhile, harmless disposal and high-quality utilization are realized, waste is turned into treasure, in line with the production concept of low carbon, green and environmental protection.

Description

[0001] This application is a divisional application of the invention patent application with application number CN202311084126.7, entitled "A Biochar and Its Preparation Method and Application", and the parent application was filed on August 25, 2023. Technical Field

[0002] This invention relates to the field of biochar preparation technology, and in particular to a method for preparing biochar. Background Technology

[0003] To ensure that their high-purity ferrosilicon meets the GB / T2272 quality standard, most domestic manufacturers use high-quality petroleum coke as a single reducing agent. However, high-quality petroleum coke has two drawbacks: firstly, it is expensive; secondly, it has low resistivity, making electrode insertion difficult, resulting in high power consumption and low yield. To address these issues, many manufacturers combine high-quality petroleum coke with charcoal. While this solves the problems of low resistivity, difficulty in electrode insertion, high power consumption, and low yield, charcoal has a high phosphorus content, making it difficult to produce qualified high-purity ferrosilicon.

[0004] Therefore, finding new reducing agents that are low in phosphorus and titanium, high in resistivity, low in carbon, green, and highly efficient is an urgent problem that enterprises producing high-purity ferrosilicon need to solve. Summary of the Invention

[0005] To address the above problems, this invention provides a method for preparing biochar.

[0006] This invention provides a method for preparing biochar, the method comprising the following steps: Waste bamboo, coconut shells, and medicinal herb root residues are crushed and mixed to obtain a mixture. The mixture is dried and granulated to obtain an intermediate product; The intermediate product is carbonized to obtain the biochar; The mass ratio of the waste bamboo, the coconut shell, and the medicinal root residue is 5:3:2. The carbonization parameters include: a temperature of 750℃~850℃ and a time of 10~12 hours.

[0007] Preferably, the particle size of the waste bamboo material is 80-100 mesh.

[0008] Preferably, the coconut shell has a particle size of 80-100 mesh.

[0009] Preferably, the particle size of the medicinal herb root and stem residue is 80-100 mesh.

[0010] Preferably, the medicinal herb residue includes at least one of the following: ginseng, Panax notoginseng, Angelica sinensis, rhubarb, Rehmannia glutinosa, Codonopsis pilosula, Atractylodes lancea, Coptis chinensis, Salvia miltiorrhiza, Atractylodes macrocephala, Isatis indigotica, and Adenophora stricta. Preferably, the particle size of the intermediate product is 30mm to 50mm.

[0011] Preferably, the biochar contains less than 0.015% phosphorus and less than 0.002% titanium by mass percentage.

[0012] Preferably, the biochar has a resistivity greater than 3000 micro ohms-meters at room temperature and a resistivity greater than 1200 micro ohms-meters at 1100°C.

[0013] The technical solutions provided in the embodiments of the present invention have at least the following advantages compared with the prior art: This invention provides a method for preparing biochar. The biochar uses waste bamboo, coconut shells, and medicinal herb root residues as raw materials to produce biochar with low phosphorus content, low titanium content, and high resistivity. This biochar can be used as a reducing agent in the production of high-purity ferrosilicon. Simultaneously, it achieves harmless disposal and high-quality utilization, turning waste into treasure, and conforms to the production concepts of low-carbon, green, and environmentally friendly practices. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic flowchart of a method for preparing biochar according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the actual production process of biochar provided in an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0020] In a first aspect, the present invention provides a biochar, wherein the raw materials for preparing the biochar include the following components: waste bamboo, coconut shell and medicinal herb root residue; The medicinal root residues mentioned include at least one of the following: ginseng, Panax notoginseng, Angelica sinensis, rhubarb, Rehmannia glutinosa, Codonopsis pilosula, Atractylodes lancea, Coptis chinensis, Salvia miltiorrhiza, Atractylodes macrocephala, Isatis indigotica, and Adenophora stricta.

[0021] This invention provides a biochar made from waste bamboo, coconut shells, and medicinal herb root residues. The resulting biochar is low in phosphorus and titanium, and has high resistivity. It can be used as a reducing agent in the production of high-purity ferrosilicon. Simultaneously, it achieves harmless disposal and high-quality utilization, turning waste into treasure, and conforms to the production concepts of low-carbon, green, and environmentally friendly practices.

[0022] In a specific embodiment, the waste bamboo material can be selected from clean bamboo shavings, bamboo sawdust, bamboo wood chips, and other waste materials that have not been contaminated during bamboo processing. Before use, it can be washed with clean water multiple times and dried.

[0023] In a specific embodiment, the coconut shell can be a clean coconut shell left over from the processing of coconut juice and coconut milk that has not been contaminated secondary. Before use, it can be washed with clean water several times and dried.

[0024] In a specific embodiment, the medicinal herb residue can be clean, uncontaminated medicinal herb residue after processing and extraction from the roots and stems of Chinese medicinal herbs such as ginseng, Panax notoginseng, Angelica sinensis, rhubarb, Rehmannia glutinosa, Codonopsis pilosula, Atractylodes lancea, Coptis chinensis, Salvia miltiorrhiza, Atractylodes macrocephala, Isatis indigotica, and Adenophora stricta.

[0025] In one embodiment of this application, the mass ratio of the waste bamboo, the coconut shell, and the medicinal root residue is 5:3:2.

[0026] The present invention controls the mass ratio of the waste bamboo, coconut shell, and medicinal herb root residue to control the carbon, phosphorus, and titanium content in the resulting mixture, thereby facilitating the production of biochar with low phosphorus and titanium content and high resistivity. The preferred mass ratio of the waste bamboo, coconut shell, and medicinal herb root residue is 5:3:2.

[0027] In a specific embodiment, the particle size of the waste bamboo material is 80-100 mesh, the particle size of the coconut shell is 80-100 mesh, and the particle size of the medicinal herb root and stem residue is 80-100 mesh.

[0028] As one embodiment of this application, the biochar contains less than 0.015% phosphorus and less than 0.002% titanium by weight; the biochar has a room temperature resistivity greater than 3000 micro ohms-meters and a high temperature resistivity greater than 1200 micro ohms-meters.

[0029] The biochar provided by this invention has at least the following characteristics: Low phosphorus content: The biochar provided by this invention has a phosphorus content as low as 0.015%. Tested according to GB / T24194, the actual measured value is 0.010% to 0.013%.

[0030] Low titanium content: The biochar provided by this invention contains less than 0.002% titanium. Tested according to GB / T24194, the actual measured value is 0.0012% to 0.0014%.

[0031] High resistivity: The biochar provided by this invention has a room temperature resistivity greater than 3000 micro ohm-meters and a high temperature resistivity greater than 1200 micro ohm-meters. Tested according to GB / T24521, the actual measured value is 1260–1300 micro ohm-meters.

[0032] Secondly, based on a general inventive concept, the present invention provides a method for preparing biochar according to any one of the first aspects, such as... Figure 1 As shown, the preparation method includes the following steps: Waste bamboo, coconut shells, and medicinal herb root residues are crushed and mixed to obtain a mixture. The mixture is dried and granulated to obtain an intermediate product; The intermediate product is carbonized to obtain the biochar.

[0033] The biochar preparation method provided by this invention is simple to operate, requires no specific equipment or complex processes, and is suitable for mass production.

[0034] In a specific embodiment, the particle size of the intermediate product is 30mm to 50mm, and the carbonization working parameters include: temperature of 750℃ to 850℃ and time of 10 to 12 hours.

[0035] In a specific embodiment, such as Figure 2 As shown, the above preparation method can specifically include the following processes in actual factory production: (1) Select bamboo raw materials: bamboo chips, bamboo sawdust, bamboo shavings and other wastes in the bamboo processing process must be clean and free from secondary pollution. After entering the factory, they should be crushed into 80-100 mesh powder and stored for later use. (2) Selecting coconut shell raw materials: The coconut shells used for processing coconut juice and coconut milk must be clean and free from secondary contamination. After entering the factory, they should be crushed into 80-100 mesh powder and stored for later use. (3) Carefully selected medicinal herb root and stem residue: The residue after processing and extraction of traditional Chinese medicine oral liquids must be clean and free from secondary contamination. The types of residue include: ginseng, Panax notoginseng, Angelica sinensis, rhubarb, Rehmannia glutinosa, Codonopsis pilosula, Atractylodes lancea, Coptis chinensis, Salvia miltiorrhiza, Atractylodes macrocephala, Isatis indigotica, and Adenophora stricta. After entering the factory, the residue is sieved and then crushed into 80-100 mesh powder for storage and later use. (4) Mix bamboo powder, coconut shell powder, and medicinal herb root and stem residue powder in a ratio of 5:3:2. This ratio is mainly based on the material balance of the fixed carbon, phosphorus, and titanium content of the three raw materials. Of course, the ratio can also be adjusted according to the different fixed carbon, phosphorus, and titanium content of the three raw materials. After the mixed materials are evenly mixed, they are put into a drum dryer to adjust the moisture content (moisture content <2%).

[0036] (5) The mixture after mixing and moisture adjustment is high pressure molded into an intermediate product with a particle size of about 40mm. The intermediate product is heated to about 800℃ in an air-isolated dry distillation carbonization furnace to dry distill into a new type of biochar.

[0037] (6) Qualified new biochar is directly added to the reducing submerged arc furnace according to the given ratio to produce high-purity ferrosilicon, and statistics and evaluation are carried out.

[0038] Thirdly, the present invention provides the application of biochar prepared by the method of preparing biochar according to any one of the first aspects and biochar according to any one of the second aspects in the preparation of high-purity ferrosilicon.

[0039] The biochar provided by this invention has the characteristics of low phosphorus content, low titanium content and high resistivity, and can be used as a reducing agent in the production of high-purity ferrosilicon, which has broad practical application value.

[0040] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to national standards. If there is no corresponding national standard, then generally accepted international standards, conventional conditions, or conditions recommended by the manufacturer shall be followed.

[0041] This embodiment provides a biochar, which is made from waste bamboo, coconut shells and medicinal herb root residue in a mass ratio of 5:3:2. The specific preparation method includes the following process: 1) Selected bamboo raw materials: Select clean bamboo chips, bamboo sawdust, bamboo shavings and other waste bamboo materials that have not been contaminated during the bamboo processing. After entering the factory, they are crushed into 80-100 mesh powder and stored for later use. 2) Selected coconut shell raw materials: Clean coconut shells left over from the processing of coconut juice and coconut milk that have not been contaminated by secondary pollution are used. After entering the factory, they are crushed into 80-100 mesh powder and stored for later use. 3) The clean, uncontaminated medicinal root residue after processing and extraction of ginseng root and rhizome is used. After entering the factory, it is screened and crushed into 80-100 mesh powder for storage and later use. 4) Mix bamboo powder, coconut shell powder and Chinese herbal root and stem residue powder in a ratio of 5:3:2; after the mixture is evenly mixed, put it into a drum dryer to adjust the moisture content and keep the moisture content of the mixture <2%; 5) The mixture after mixing and moisture adjustment is pressurized to form an intermediate product with a particle size of 40mm. The intermediate product is then heated to 800℃ in an air-isolated carbonization furnace for 12 hours to obtain a new type of biochar.

[0042] According to GB / T24194, the phosphorus content of the biochar obtained in this example is 0.011%; the titanium content of the biochar obtained in this example is 0.0013%; according to GB / T24521, the resistivity of the biochar obtained in this example at room temperature is 3000 micro ohms·m and the resistivity at 1100℃ is 1280 micro ohms·m.

[0043] Embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 5 has specifically disclosed sub-ranges, such as from 1 to 2, from 1 to 3, from 1 to 4, from 2 to 3, from 2 to 5, from 3 to 5, etc., and single numbers within the range, such as 1, 2, 3, 4, and 5, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the range referred to.

[0044] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for preparing biochar, characterized in that, The preparation method includes the following steps: Waste bamboo, coconut shells, and medicinal herb root residues are crushed and mixed to obtain a mixture. The mixture is dried and granulated to obtain an intermediate product; The intermediate product is carbonized to obtain the biochar; The mass ratio of the waste bamboo, the coconut shell, and the medicinal root residue is 5:3:

2. The carbonization parameters include: a temperature of 750℃~850℃ and a time of 10~12 hours.

2. The method for preparing biochar according to claim 1, characterized in that, The particle size of the waste bamboo material is 80-100 mesh.

3. The method for preparing biochar according to claim 1, characterized in that, The coconut shell has a particle size of 80-100 mesh.

4. The method for preparing biochar according to claim 1, characterized in that, The particle size of the medicinal herb root and stem residue is 80-100 mesh.

5. The method for preparing biochar according to claim 1, characterized in that, The medicinal root residues mentioned include at least one of the following: ginseng, Panax notoginseng, Angelica sinensis, rhubarb, Rehmannia glutinosa, Codonopsis pilosula, Atractylodes lancea, Coptis chinensis, Salvia miltiorrhiza, Atractylodes macrocephala, Isatis indigotica, and Adenophora stricta.

6. The method for preparing biochar according to claim 1, characterized in that, The particle size of the intermediate product is 30mm to 50mm.

7. The method for preparing biochar according to claim 1, characterized in that, The biochar contains less than 0.015% phosphorus and less than 0.002% titanium by mass percentage.

8. The method for preparing biochar according to claim 1, characterized in that, The biochar has a resistivity greater than 3000 micro ohms at room temperature and a resistivity greater than 1200 micro ohms at 1100℃.

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