Method for preparing magnetic biochar from straw

Abstract

A method for preparing magnetic biochar from straw includes the step of selecting of a straw material, wherein wheat straw, corn straw, rice straw or cotton straw is selected as the straw material, the straw material is pretreated by cleaning, then the straw material is dipped with a trivalent iron salt solution, and filtered by vacuum, then a filter cake is dried, and a finished magnetic biochar product can be obtained by carbonization treatment in inert gas conditions. The magnetic biochar can be obtained by dipping the straw material in the trivalent iron salt solution by a pyrolysis process, and a new way for the use of straw is provided.

Description

technical field

[0001] The invention relates to a method for preparing biochar by utilizing lignocellulosic biomass waste. In particular, the invention relates to a method for preparing magnetic biochar by using straw raw materials. Background technique

[0002] With the development of agriculture, straws are discarded and burned, which brings many hazards.

[0003] For example, wheat is one of the main food crops, and its planting area and output both account for more than 1 / 4 of the grain output. Most of the wheat stalks produced after wheat harvest are discarded and burned on the spot, which not only causes a huge waste of resources, but also produces serious environmental pollution, and even leads to frequent fire accidents. If it can be used reasonably, it will bring considerable economic and environmental benefits.

[0004] Biochar is a material rich in carbon elements. Biochar can be used for the adsorption of pollutants in water, and can also be used as a carrier ...

Examples

Embodiment 1

[0053] A method for preparing magnetic biochar from wheat straw, using wheat straw as raw material, the specific preparation process and process steps are as follows:

[0054] 1. Clean pretreatment of wheat straw.

[0055] Wheat straw is used as raw material, and the wheat straw is cleaned and pretreated first.

[0056] The wheat straw pretreatment is to wash, dry, crush and sieve the wheat straw, and take the wheat straw particles with a particle size greater than 60 meshes and seal them up for later use.

[0057] 2. Ferric salt solution impregnation.

[0058] Take 500g of anhydrous ferric chloride, dissolve it in 2000mL of deionized water, stir evenly, and configure a ferric salt solution; put 100g of dried wheat straw particles in the solution, and immerse for 60min under magnetic stirring.

[0059] After impregnated with anhydrous ferric chloride solution, it is vacuum filtered, and the filter cake is dried at 60°C to constant weight.

[0060] 3. Carbonization

[0061]...

Embodiment 2

[0065] A method for preparing magnetic biochar from wheat straw, using wheat straw as raw material, the specific preparation process and process steps are as follows:

[0066] 1. Clean pretreatment of wheat straw

[0067] Wheat straw is used as raw material, and the wheat straw is cleaned and pretreated first.

[0068] The wheat straw pretreatment is to wash, dry, crush and sieve the wheat straw, and take the wheat straw particles with a particle size greater than 60 meshes and seal them up for later use.

[0069] 2. Ferric salt solution impregnation

[0070] Dissolve ferric salt or iron salt hydrate in deionized water to form a ferric salt solution; place wheat straw particles in the ferric salt solution, and the mass ratio of ferric salt to wheat straw particles is 1: 1. Impregnation under magnetic stirring, the impregnation time should be 240min.

[0071] The ferric salt solution is a solution of ferric nitrate, and the mass percent concentration of the ferric salt solut...

Embodiment 3

[0078] A method for preparing magnetic biochar from wheat straw, using wheat straw as raw material, the specific preparation process and process steps are as follows:

[0079] 1. Clean pretreatment of wheat straw

[0080] Wheat straw is used as raw material, and the wheat straw is cleaned and pretreated first.

[0081] The wheat straw pretreatment is to wash, dry, crush and sieve the wheat straw, and take the wheat straw particles with a particle size greater than 60 meshes and seal them up for later use.

[0082] 2. Ferric salt solution impregnation

[0083] Dissolve ferric salt or iron salt hydrate in deionized water to form a ferric salt solution; place wheat straw particles in the ferric salt solution, and the mass ratio of ferric salt to wheat straw particles is 10: 1. Impregnation under magnetic stirring, the impregnation time should be 20min.

[0084] The ferric salt solution is a solution of ferric sulfate, and the mass percent concentration of the ferric salt solut...

technical field

[0001] The invention relates to a method for preparing biochar by utilizing lignocellulosic biomass waste. In particular, the invention relates to a method for preparing magnetic biochar by using straw raw materials. Background technique

[0002] With the development of agriculture, straws are discarded and burned, which brings many hazards.

[0003] For example, wheat is one of the main food crops, and its planting area and output both account for more than 1 / 4 of the grain output. Most of the wheat stalks produced after wheat harvest are discarded and burned on the spot, which not only causes a huge waste of resources, but also produces serious environmental pollution, and even leads to frequent fire accidents. If it can be used reasonably, it will bring considerable economic and environmental benefits.

[0004] Biochar is a material rich in carbon elements. Biochar can be used for the adsorption of pollutants in water, and can also be used as a carrier ...

Examples

Embodiment 1

[0053] A method for preparing magnetic biochar from wheat straw, using wheat straw as raw material, the specific preparation process and process steps are as follows:

[0054] 1. Clean pretreatment of wheat straw.

[0055] Wheat straw is used as raw material, and the wheat straw is cleaned and pretreated first.

[0056] The wheat straw pretreatment is to wash, dry, crush and sieve the wheat straw, and take the wheat straw particles with a particle size greater than 60 meshes and seal them up for later use.

[0057] 2. Ferric salt solution impregnation.

[0058] Take 500g of anhydrous ferric chloride, dissolve it in 2000mL of deionized water, stir evenly, and configure a ferric salt solution; put 100g of dried wheat straw particles in the solution, and immerse for 60min under magnetic stirring.

[0059] After impregnated with anhydrous ferric chloride solution, it is vacuum filtered, and the filter cake is dried at 60°C to constant weight.

[0060] 3. Carbonization

[0061]...

Embodiment 2

[0065] A method for preparing magnetic biochar from wheat straw, using wheat straw as raw material, the specific preparation process and process steps are as follows:

[0066] 1. Clean pretreatment of wheat straw

[0067] Wheat straw is used as raw material, and the wheat straw is cleaned and pretreated first.

[0068] The wheat straw pretreatment is to wash, dry, crush and sieve the wheat straw, and take the wheat straw particles with a particle size greater than 60 meshes and seal them up for later use.

[0069] 2. Ferric salt solution impregnation

[0070] Dissolve ferric salt or iron salt hydrate in deionized water to form a ferric salt solution; place wheat straw particles in the ferric salt solution, and the mass ratio of ferric salt to wheat straw particles is 1: 1. Impregnation under magnetic stirring, the impregnation time should be 240min.

[0071] The ferric salt solution is a solution of ferric nitrate, and the mass percent concentration of the ferric salt solut...

Embodiment 3

[0078] A method for preparing magnetic biochar from wheat straw, using wheat straw as raw material, the specific preparation process and process steps are as follows:

[0079] 1. Clean pretreatment of wheat straw

[0080] Wheat straw is used as raw material, and the wheat straw is cleaned and pretreated first.

[0081] The wheat straw pretreatment is to wash, dry, crush and sieve the wheat straw, and take the wheat straw particles with a particle size greater than 60 meshes and seal them up for later use.

[0082] 2. Ferric salt solution impregnation

[0083] Dissolve ferric salt or iron salt hydrate in deionized water to form a ferric salt solution; place wheat straw particles in the ferric salt solution, and the mass ratio of ferric salt to wheat straw particles is 10: 1. Impregnation under magnetic stirring, the impregnation time should be 20min.

[0084] The ferric salt solution is a solution of ferric sulfate, and the mass percent concentration of the ferric salt solut...