Ultrasonic-assisted method for leaching potassium at low temperature under normal pressure

Abstract

The invention relates to an ultrasonic-assisted method for leaching potassium at low temperature under normal pressure, which comprises the following steps: crushing and grinding: crushing and grinding potash feldspar ore until the fineness is about 150 meshes: acid-ore mixing: adding 5-15mL of phosphoric acid-organic acid mixed solution to every gram of potash feldspar, and uniformly mixing, wherein the mixing ratio of the phosphoric acid to the organic acid is (1-4):1; leaching reaction: carrying out leaching reaction on the acid-ore mixture under normal pressure at 30-100 DEG C for 10-48 hours under the assistance of ultrasonic; extraction: adding distilled water into the leaching reaction product to the original volume of the acid-ore mixture, and extracting; and carrying out solid-liquid separation to remove the filter residue, thereby obtaining the soluble potassium solution. The method is beneficial to the development of the pore fracture and the formation of the new reaction interface, promotes the action of acid dissolution, has the characteristics of short leaching time, low facility requests and the like, does not need high-temperature calcination, can perform reaction at low temperature under normal pressure, and greatly saves the production cost; and the mixed acid solution can be easily purchased in the market, and is friendly to the reaction environment.

Description

technical field [0001] The invention relates to a method for extracting potassium from potassium feldspar, in particular to an ultrasonic-assisted low-temperature leaching method for potassium. Background technique [0002] my country's water-soluble potassium resources are relatively scarce, but my country's non-water-soluble potassium resources are quite rich and spread all over the country. Among them, potassium feldspar, as a typical insoluble solid potassium salt mine, is widely distributed in my country, so it is developed and utilized. Potassium feldspar resources are of great significance. [0003] At present, the methods for extracting potassium from potassium feldspar mainly include four categories: (1) pyrolysis method, such as Chinese patent ZL200910094694. method", which needs to mix potassium feldspar and additives according to the ratio and then react at a temperature of about 1100-1400 °C, and the melting rate of potassium can reach more than 90%, but this me...

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Problems solved by technology

[0003] At present, the methods for extracting potassium from potassium feldspar mainly include four categories: (1) pyrolysis method, such as Chinese patent ZL200910094694. method", which needs to mix potassium feldspar and additives according to the ratio and then react at a temperature of about 1100-1400 °C, and the melting rate of potassium can reach more than 90%, but this method has high energy consumption and water consumption. (2) low-temperature decomposition method, low energy consumption, such as Chinese patent ZL201310016371.4 discloses "", which adopts a low-temperature semi-dry method to decompose potassium feldspar, that is, potassium feldspar, fluorite and sulfuric acid are fully After mixing, put it into the converter reactor and react at 180-250°C to obtain potassium fluorosilicate product. However, because fluoride is added in the production, potassium fluorosilicate is produced and a large amount of waste gas is produced, so there is a large investment in equipment. , environmental pollution and severe corrosion of equipment; (3) high-pressure hydrothermal method, Chinese patent CN201410066222 discloses "a method for preparing potassium fertilizer and aluminum silicate using potassium feldspar", which is to combine potassium feldspar ore powder with strong Alkaline solution is mixed evenly, and then hydrothermal reaction is carried out in a high-pressure container. The reaction temperature is 100-300°C, the pressure is 0.1-6MPa, and the potassium ion yield can reach 93%. However, this method not only requires high temperature, but also requires high pressure conditions. , there are deficiencies such as high requirements for equipment and high energy consumption; (4) microbial decomposition method has the characteristics of low energy consumption and little pollution. Screening, Identification and Potassium Solubilizing Activity of Strains", which reported that 11 strains showing a certain ability to dissolve potassium were isolated, but this method has immature technology, long culture period, slow decomposition speed, and weak viability. Potassium dissolution rate is low and other deficiencies

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