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Method to recycle phosphorus from farm waste and phosphate fertilizer

A waste and farm technology, applied in the agricultural field, can solve the problems of poor recovery of phosphorus, and achieve the effects of abundant reserves, strong operability, and reducing environmental pollution.

Inactive Publication Date: 2018-08-17
NORTHWEST A & F UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] In view of this, the embodiment of the present invention provides a method for recovering phosphorus from farm waste, the main purpose of which is to solve the problem of poor recovery of phosphorus from breeding waste

Method used

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  • Method to recycle phosphorus from farm waste and phosphate fertilizer

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Embodiment 1

[0028] like figure 1 Shown, a kind of method for reclaiming phosphorus from farm waste, comprises the following steps:

[0029] S101. Select pig manure from pig farms as raw material, and air-dry fresh pig manure in advance; select market-bought dolomite powder as an auxiliary material; if you want to prepare magnetic materials, you can choose market-bought iron filings or iron powder as magnets Source; fully mix and grind dry pig manure and dolomite powder (the smaller the particle, the better), in this process can also be mixed with a little iron filings or iron powder; then, mix and grind the treated pig manure Put the mixture with dolomite powder into a porcelain crucible, place it in a high-temperature muffle furnace, and heat and crack it under the condition of no oxygen (nitrogen or argon can be introduced), so that the temperature is maintained at 900-950 degrees Celsius for about 1-2 Hours, then stop heating and cool to room temperature under the condition of no oxyg...

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Abstract

The invention discloses a method to recycle phosphorus from farm waste and relates to the technical field of agriculture. The method comprises: mixing animal dry excrement and dolomite powder, and crushing to obtain a primary mixture; heating the primary mixture in an oxygen-free environment, allowing pyrolysis, and cooling to room temperature to obtain a magnesium-calcium oxide-carried carbon-based composite; adding the magnesium-calcium oxide-carried carbon-based composite into phosphorus-containing farming wastewater, transferring phosphate ions into pores or mineral structure of the magnesium-calcium oxide-carried carbon-based composite to obtain a secondary composite; subjecting the secondary composite to solid-liquid separation to obtain the separated solid matter, phosphorus-rich material. The pig manure and dolomite are used to prepare an adsorbing material, having low cost; the materials are taken in situ; the method is environmentally friendly, can adsorb phosphorus effectively, makes reasonable use of dry excrement solid waste from farms, extracts phosphorus from farm liquid waste so that less pollution is caused, and also extracts the phosphorus-rich material; triple purposes are achieved at a time.

Description

technical field [0001] The invention relates to the field of agricultural technology, in particular to a method for recovering phosphorus from farm waste and phosphorus fertilizer. Background technique [0002] The use of phosphate fertilizer is inseparable from the agricultural planting process. As phosphorus is a non-renewable resource, the reserve of phosphate rock resources is related to the national development strategy and sustainable agricultural development. At present, the global reserves of phosphate rock resources can be exploited by humans for less than 200 years. my country is the country with the largest amount of phosphate fertilizer mining in the world, and its phosphate rock reserves can only last for 35 years. Although my country is currently short of phosphate rock resources, on the other hand, the extensive management in my country's agricultural production has also led to widespread loss of phosphorus in field management and surface water, which has led ...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05B7/00C05G3/00C05B9/00C05D9/00C05F3/00C05F11/00
Inventor 李荣华张增强
Owner NORTHWEST A & F UNIV
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