Method for leaching potassium in phosphorus potassium associated ore at low temperature by assisting with microwaves/ultrasonic waves

Abstract

The invention relates to a method for leaching potassium in phosphorus potassium associated ore at low temperature by assisting with microwaves / ultrasonic waves. The method comprises the following steps of (1) mixing materials, taking phosphorus potassium associated ore powder and assistant fluorite to be evenly mixed, and then adding phosphoric acid for soaking to obtain a mixture; (2) conducting microwave and ultrasonic wave leaching; (3) obtaining primary filter residues and primary filter liquor; (4) obtaining secondary filter residues and secondary filter liquor; and (5) mixing a leaching liquid, mixing the obtained primary filter liquor and the obtained secondary filter liquor to obtain the leaching liquid containing potassium. The method has the advantages of substantially shortening heat conduction time, avoiding shortcomings of uneven heating in a traditional heating mode, being energy-efficient due to microwave heating, and almost having no other loss except for temperature rise of materials to be heated. Cavatition of the ultrasonic waves enables liquid to cause a series of movements such as swelling, compression and sinking and the like, and produced chemical effects and mechanical effects can change reaction conditions and quicken reaction speed.

Description

technical field [0001] The invention belongs to the technical field of phosphorus and potassium compound fertilizer production, and relates to a method for extracting potassium from low-grade phosphorus and potassium associated ores, in particular to a method for leaching potassium from phosphorus and potassium associated ores at a low temperature assisted by microwave / ultrasonic waves. Background technique [0002] Since the 1970s, a series of phosphorus and potassium associated ores have been discovered in various parts of the country (Sichuan Hanyuan, Inner Mongolia Jixi, Hubei Yichang, etc.), with large reserves but low phosphorus and potassium grades. The phosphorus and potassium associated ore has the excellent characteristics of natural phosphorus and potassium symbiosis. If it can be rationally used to produce phosphorus and potassium compound fertilizers that are in short supply in my country, the contradiction between supply and demand of phosphorus and potassium fe...

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Problems solved by technology

[0004] At present, there are four main methods for extracting potassium from potassium feldspar: one is high-temperature volatilization method, that is, potassium feldspar, limestone, dolomite, fluorite and coke are reacted at high temperature in proportion to ingredients, and the K 2 O and CO in the furnace 2 Generate K 2 CO 3 , but this method has high energy consumption and low potassium yield; the second type is high-temperature sintering method, which is to mix potassium feldspar and additives and then melt and roast. This method also consumes a lot of energy and is difficult to handle after sintering; the third type It is a fluorine decomposition method, which uses fluorine-containing additives to decompose potassium feldspar below 200 ° C under inorganic acid. This type of method requires high corrosion resistance of equipment; the last type is microbial decomposition method, which is metabolized by microorganisms and bacteria. biochemical reaction with potassium feldspar, the process of this method is simple and there is no problem of discharge of three wastes, but the selection and breeding of bacteria is difficult, and the domestication is difficult

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