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

A phosphorus-potassium associated ore and ultrasonic technology are applied in the field of using microwave/ultrasonic-assisted low-temperature leaching of potassium in phosphorus-potassium associated ores, and the extraction of potassium in low-grade phosphorus-potassium associated ores, which can solve the requirements of high corrosion resistance and strain selection. Difficulty in breeding and domestication, etc., to achieve the effects of enhancing material transfer, shortening heat conduction time, and reducing reaction activation energy

Inactive Publication Date: 2013-01-09
WUHAN INSTITUTE OF TECHNOLOGY +1
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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

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

Examples

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Example Embodiment

[0025] Example 1

[0026] The ore in the embodiment of the present invention is a phosphate-potassium associated ore in which collophane and potash feldspar from the Yiling area of ​​Yichang, Hubei Province coexist. 2 O 8.63%, P 2 O 5 6.63%, SiO 2 55.48%, Al 2 O 3 13.42%, CaO 5.46%, Fe 2 O 3 3.84%, Na 2 O 1.34%, MgO 1.13% specifications of phosphorus and potassium associated ore.

[0027] 1) Ingredients: Take the dry -180 mesh phosphate and potassium associated mineral powder and the auxiliary fluorite and mix them evenly, then add phosphoric acid to soak. The amount of fluorite added is 29% of the weight of the phosphorus and potassium associated mineral powder, and the mass percentage concentration of phosphoric acid 60%, the addition amount is 9mL / g of phosphorus-potassium associated mineral powder to obtain a mixture;

[0028] 2) Microwave leaching: Put the uniformly mixed mixture in step 1) in a microwave reactor, use 2450MHz microwave radiation to heat, the total microwave...

Example Embodiment

[0033] Example 2

[0034] The ore in the example is a phosphate-potassium associated ore in which collophane and potassium feldspar from the Yiling area of ​​Yichang, Hubei Province coexist, containing K 2 O 8.63%, P 2 O 5 6.63%, SiO 2 55.48%, Al 2 O 3 13.42%, CaO 5.46%, Fe 2 O 3 3.84%, Na 2 O 1.34%, MgO 1.13% specifications of phosphorus and potassium associated ore.

[0035] 1) Ingredients: Take the dry -180 mesh phosphate and potassium associated mineral powder and the auxiliary fluorite and mix them evenly, then add phosphoric acid to soak. The amount of fluorite added is 29% of the weight of the phosphorus and potassium associated mineral powder, and the mass percentage concentration of phosphoric acid 60%, the addition amount is 9mL / g phosphorus and potassium associated mineral powder to obtain a mixture;

[0036] 2) Ultrasonic leaching: Put the mixed mixture in step 1) into an electric heating mantle for heating, set the temperature to 120℃, use 40kHz ultrasonic treatment...

Example Embodiment

[0042] Example 3

[0043] The ore in the embodiment of the present invention is a phosphate-potassium associated ore in which collophane and potash feldspar from the Yiling area of ​​Yichang, Hubei Province coexist. 2 O 8.63%, P 2 O 5 6.63%, SiO 2 55.48%, Al 2 O 3 13.42%, CaO 5.46%, Fe 2 O 3 3.84%, Na 2 O 1.34%, MgO 1.13% specifications of phosphorus and potassium associated ore.

[0044] 1) Ingredients: Take the dry -180 mesh phosphate and potassium associated mineral powder and the auxiliary fluorite and mix them evenly, then add phosphoric acid to soak. The amount of fluorite added is 30% of the weight of the phosphorus and potassium associated mineral powder, and the mass percentage concentration of phosphoric acid 65%, and the added amount is 15mL / g of phosphorus and potassium associated mineral powder to obtain a mixture;

[0045] 2) Microwave leaching: Put the uniformly mixed mixture in step 1) in a microwave reactor, use 916MHz microwave radiation to heat, the total micr...

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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 China, the contradiction between supply and demand of phosphorus and potassium fertili...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B26/10
CPCY02P10/20
Inventor 王存文黄启生王为国何涛覃远航李和安段欢李书清吴元欣苗华军吕仁亮邹德新张俊峰杜浩然
Owner WUHAN INSTITUTE OF TECHNOLOGY
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