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A method for preparing cow dung biochar that inhibits nitrogen fertilizer leaching loss

A technology of biochar and cow dung, which is applied in the direction of fertilizer mixture, fertilization device, agricultural gas emission reduction, etc., can solve the problems of no discovery, and achieve the effect of improving utilization efficiency, good economic benefits, and improving soil

Inactive Publication Date: 2016-06-15
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no relevant reports have been found through literature and patent searches on the related research on the use of cow dung as raw material to prepare biochar to inhibit soil nitrogen leaching.

Method used

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  • A method for preparing cow dung biochar that inhibits nitrogen fertilizer leaching loss
  • A method for preparing cow dung biochar that inhibits nitrogen fertilizer leaching loss

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Pretreatment of cow dung:

[0027] 1.1 Cow dung collection

[0028] Clean the fresh cow dung out of stones and other sundries. Make the amount of impurities in it less than 5%.

[0029] 1.2. Cow dung drying

[0030] Add 1% quicklime to the collected cow dung and mix thoroughly so that the cow dung will not ferment anaerobically. The cow dung was spread flat on a clean hard cement slab with a thickness of 10 cm, and was naturally air-dried for 6 days under natural ventilation. The moisture content of cow dung is reduced below 20%.

[0031] 2. Preparation of Biochar

[0032] 2.1 Preheating

[0033] The cow dung after the above-mentioned dry treatment is tiled in the tray, and the thickness is 3cm. Put it in an oven and dry it at 95°C for 5 hours, so that the moisture content of cow dung is below 8%.

[0034] 2.2 Pyrolysis of biochar

[0035] Put the above-mentioned preheated cow dung into a crucible-like vessel, put it into a muffle furnace, and then close the...

Embodiment 2

[0042] 1. Pretreatment of cow dung:

[0043] 1.1 Cow dung collection

[0044] Clean the fresh cow dung out of stones and other sundries. Make the amount of impurities in it less than 5%.

[0045] 1.2. Cow dung drying

[0046] Add 1.5% quicklime to the collected cow dung and mix thoroughly so that the cow dung will not be fermented anaerobically. The cow dung was spread on a clean hard cement slab with a thickness of 12cm, and was naturally air-dried for 9 days under natural ventilation. The moisture content of cow dung is reduced below 20%.

[0047] 2. Preparation of Biochar

[0048] 2.1 Preheating

[0049] Spread the cow dung after the above-mentioned dry treatment in the tray with a thickness of 4cm. Put it in an oven and dry it at 100°C for 4 hours, so that the moisture content of cow dung is below 8%.

[0050] 2.2 Pyrolysis of biochar

[0051]Put the above-mentioned preheated cow dung into a crucible-like vessel, put it into a muffle furnace, and then close the mu...

Embodiment 3

[0058] 1. Pretreatment of cow dung:

[0059] 1.1 Cow dung collection

[0060] Clean the fresh cow dung out of stones and other sundries. Make the amount of impurities in it less than 5%.

[0061] 1.2. Cow dung drying

[0062] Add 2% quicklime to the collected cow dung and mix thoroughly so that the cow dung will not ferment anaerobically. The cow dung was spread on a clean hard cement slab with a thickness of 15cm, and was naturally air-dried for 12 days under natural ventilation. The moisture content of cow dung is reduced below 20%.

[0063] 2. Preparation of Biochar

[0064] 2.1 Preheating

[0065] The cow dung after the above-mentioned dry treatment is tiled in the tray, and the thickness is 5cm. Put it in an oven and dry it at 105°C for 3 hours, so that the moisture content of cow dung is below 8%.

[0066] 2.2 Pyrolysis of biochar

[0067] Put the above-mentioned preheated cow dung into a crucible-like vessel, put it into a muffle furnace, and then close the muf...

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Abstract

The invention discloses a method for preparing cow dung charcoal for inhibiting nitrogenous fertilizer leaching loss, and relates to a charcoal preparation method. The method comprises the following steps of pretreating cow dung, namely, collecting and drying cow dung so as to reduce the water content of cow dung to be 10-20%; preparing the charcoal, namely, preheating to keep the water content of cow dung to be about 5-8%; splitting the charcoal, namely, performing pyrolysis for 2-3 hours under anoxic condition; finally turning off a power supply control switch of a muffle furnace; cooling to be less than 80 DEG C under the condition that the door of the muffle furnace is closed; taking out a crucible utensil from the muffle furnace; putting into a drier for being cooled for later use; crushing the charcoal, namely, putting the cow dung charcoal prepared from splitting into a crushing machine for crushing, screening, and taking the cow dung charcoal of 20-40 meshes. Due to adoption of the method of applying the cow dung charcoal soil improver, the resource utilization ways of cow dung are widened, the utilization efficiency of a nitrogenous fertilizer is improved, and the environment pollution caused by nitrogenous fertilizer leaching loss is reduced.

Description

technical field [0001] The invention relates to a method for preparing biochar, in particular to a method for preparing cow dung biochar that suppresses nitrogen fertilizer leaching. Background technique [0002] At present, the main research and application directions of the utilization of cow dung biomass resources are: using cow dung to produce organic fertilizers, producing edible fungi, and mixing cow dung with cow urine to produce biogas, etc. However, these cow dung resource utilization methods also have deficiencies. One is the limited utilization rate of the produced cow dung, and the other is the problem of secondary pollution generated during the utilization of cow dung. According to survey statistics, only about 10% of cow dung is processed and used as agricultural fertilizers, etc., and the remaining 90% of cow dung is in a state of accumulation and storage. The accumulated cow dung not only contributes to soil, water, atmosphere, human Health has brought a new...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/08C05G3/90
CPCY02P60/21Y02A40/22
Inventor 林静雯吴丹孙丽娜王丹丹张岩谢东青
Owner SHENYANG UNIV
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