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Method for abstracting potassium from straw by microwave technique

A technology of straw, microwave digestion, applied in chemical instruments and methods, sodium/potassium compounds, alkali metal nitrates, etc.

Inactive Publication Date: 2008-07-30
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for abstracting potassium from straw by microwave technique

Examples

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example 1

[0014] In this example, straw from the eastern suburbs of Chengdu was used as the raw material, and the K content in the straw was 3.2%. Take 100 g of straw, crush it to 200 mesh, add 2500 ml of distilled water to digest it with microwave, and the digestion time is 3 minutes. The potassium leaching rate in the digestion solution is 90.6%. The extract was enriched by ion exchange resin, evaporated and concentrated to obtain potassium salt with a purity of 45.3% (K 2 O).

example 2

[0016] In this example, straw from the western suburbs of Chengdu was used as the raw material, and the K content in the straw was 2.8%. Take 200g of straw, grind it to 120 mesh, add 5000ml of distilled water to digest it with microwave, the digestion time is 3 minutes, and the potassium content in the digestion solution is 89.3%. The extract was enriched by ion exchange resin, evaporated and concentrated to obtain potassium salt with a purity of 45.1% (K 2 O).

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Abstract

The invention relates to a method for extracting potassium from straws which adopts the water as leaching agent, uses microwave technique to damage fibrous tissue structure of the straws so that the potassium in the straws are precipitated in the form of ions; ion exchanger such as cation exchange resin or zeolite are used for separating and leaching the potassium in the solution; the solution such as hydrochloride, sulfate, nitric acid and so on are adopted to carry out the extrication; extrication liquid is evaporated, concentrated and crystallized to obtain the corresponding potassium salt products such as potassium chloride, potassium sulfate, potassium nitrate and so on. The experimental result displays that: extraction rate of the potassium in the straws can reach more than 70 percent and the concentration of the potassium in leaching solution can reach 3.6g / l. The method is also applied to the extraction of the potassium in the analog substances like wheat, corns, bamboos, trees and so on.

Description

Technical field: [0001] A large proportion of the potassium fertilizer absorbed from the soil during the growth of crops exists in the straw. As a waste of agricultural production, straw contains a large amount of potassium resources and must be recycled. The invention relates to a method for recovering potassium in crop waste straw. That is, the K in straw under microwave treatment + Soluble in the leaching solution, use ion exchange resin or inorganic ion exchanger to absorb the potassium in the extraction solution, use hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid and other solutions to rinse and release the potassium on the resin or ion exchanger, evaporate and concentrate the solution, Crystallization yields various potassium salt products. The method can be used not only for extracting potassium from rice straw, corn and wheat straw, but also for extracting potassium from bamboo and tree substances, and at the same time, it can be used in papermaking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/00C01D5/00C01D7/00C01D9/00C01D13/00
Inventor 安莲英唐明林冯毅
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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