Method for preparing biological carbon with high nitrogen-phosphorus adsorption properties

A technology of adsorption performance and biochar, which is applied in the fields of agricultural and forestry waste resource utilization and environmental pollution control, can solve problems such as low resource utilization level and environmental risks, and achieve high product recovery rate, low equipment requirements, and large adsorption capacity. Effect

Active Publication Date: 2014-03-05
四川发展环境科学技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] my country produces more than 872 million tons of agricultural and forestry waste biomass such as crop stalks and forestry residues and sawdust every year. Conventional disposal and utilization methods for such huge resources, such as incineration and composting, not only have a low level of resource utilization, but also There are potential environmental risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Rare Earth Chloride Catalytic Pyrolysis of Different Biomass Raw Materials to Prepare Biochar Adsorption of Nitrogen and Phosphorus

[0018] (1) Materials

[0019] 1. Biomass raw materials: corn stalks, Jerusalem artichoke stalks, oak sawdust, pine sawdust

[0020] 2. Rare earth chloride salt catalyst: LaCl 3 ·7H 2 o

[0021] (2) Method

[0022] 1. Sorting impurities from collected corn stalks, Jerusalem artichoke stalks, oak sawdust, and pine sawdust, air-dried them, and crushed them through a 40-mesh sieve.

[0023] 2. Weigh 37.15g LaCl 3 ·7H 2 O was dissolved and adjusted to 1000ml of distilled water to obtain a 0.1mol / L lanthanum chloride solution.

[0024] 3. Weigh 30g of crushed corn stalks, Jerusalem artichoke stalks, oak sawdust, and pine sawdust as raw materials, add them to 300mL of lanthanum chloride solution with a concentration of 0.1mol / L, stir well, and soak for 12 hours. After vacuum filtration, place in an oven and dry at 105°C.

[00...

Embodiment 2

[0031] Example 2 Adsorption of Nitrogen and Phosphorus by Biochar Prepared by Catalytic Pyrolysis of Different Light Rare Earth Chloride Salts

[0032] (1) Materials

[0033] 1. Biomass raw material: oak sawdust

[0034] 2. Rare earth salt catalyst: LaCl 3 ·7H 2 O, CeCl 3 ·7H 2 O, PrCl 3 ·7H 2 O, NdCl 3 ·6H 2 o

[0035] (2) Method

[0036] 1. After the collected oak sawdust is sorted out of non-biological impurities, it is air-dried and crushed through a 40-mesh sieve.

[0037] 2. Weigh 37.15g respectively: LaCl 3 ·7H 2 O, 37.26 g CeCl 3 ·7H 2 O, 37.34 g PrCl 3 ·7H 2 O, 35.87g NdCl 3 ·6H 2 O, dissolved and fixed to 1000ml of distilled water, correspondingly prepared 0.1mol / L various rare earth chloride salt solutions.

[0038] 3. Weigh 30g of raw materials, add 300mL of lanthanum chloride, cerium chloride, praseodymium chloride and neodymium chloride solution with a concentration of 0.1mol / L respectively, stir evenly, and soak for 12 hours. After the materi...

Embodiment 3

[0044] Example 3 Adsorption of Nitrogen and Phosphorus by Biochar Prepared by Catalytic Pyrolysis of Different Concentrations of Rare Earth Chloride Salt

[0045] (1) Materials

[0046] 1. Biomass raw material: oak sawdust;

[0047] 2. Rare earth salt catalyst: LaCl 3 ·7H 2 O;

[0048] (2) Method

[0049] 1. Sorting out non-biological impurities from the collected oak sawdust, air-dried, and crushed through a 40-mesh sieve.

[0050] 2. Weigh 18.58g, 37.15g and 55.73g LaCl respectively 3 ·7H 2 O, respectively dissolved and fixed to 1000ml distilled water, correspondingly prepared three kinds of high, medium and low concentration lanthanum chloride solutions of 0.05mol / L, 0.1mol / L and 0.15mol / L.

[0051] 3. Weigh 30g of raw materials, add them into 300mL lanthanum chloride solutions with concentrations of 0.05mol / L, 0.1mol / L and 0.15mol / L respectively, stir evenly, and soak for 12h. After the material is vacuum filtered, it is placed in an oven and dried at 105°C.

[00...

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Abstract

The invention discloses a method for preparing biological carbon with high nitrogen-phosphorus adsorption properties. According to the method, forestry and agricultural residues are taken as raw materials to prepare the biological carbon with the high nitrogen-phosphorus adsorption property by carrying out high-temperature oxygen-deficient themolysis by utilizing the catalytic performance of light rare earth elements. The sources of the utilized raw materials are wide, the cost of a rare earth catalyst is low, and the prepared biological carbon is high in nitrogen-phosphorus adsorption speed and large in nitrogen-phosphorus adsorption capacity; the largest adsorbing capacities of NO3<->, NH4<+> and PO4<3-> can respectively reach 38.44mg/g, 15.58mg/g and 19.74mg/g. The method is simple in process operation, low in investment requirement and cost and high in product recovery rate and application value.

Description

technical field [0001] The invention relates to the fields of resource utilization of agricultural and forestry waste and environmental pollution control, in particular to a method for preparing biochar with high nitrogen and phosphorus adsorption performance. Background technique [0002] my country produces more than 872 million tons of agricultural and forestry waste biomass such as crop stalks and forestry residues and sawdust every year. Conventional disposal and utilization methods for such huge resources, such as incineration and composting, not only have a low level of resource utilization, but also There are potential environmental risks. Therefore, how to dispose of agricultural and forestry wastes scientifically and rationally so that they can be efficiently utilized as resources and reduce potential environmental risks has become the focus of attention. The preparation of biochar from agricultural and forestry waste biomass through pyrolysis process is a relative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30
Inventor 沈飞王章鸿杨刚张延宗曾咏梅邓仕槐伍钧王莉淋肖鸿彭宏张小洪蔺丽丽李远伟
Owner 四川发展环境科学技术研究院有限公司
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