Method for extracting potassium in potassium-containing rock

Abstract

The invention belongs to the technical field of potassium-containing rock treatment, and particularly relates to a method for extracting potassium in potassium-containing rock. The method includes thefollowing steps that first, primary calcination is conducted; second, cooling is performed, and the primarily-calcined product is cooled to be at an indoor temperature; third, an ultrasonic reactionis carried out, the cooled product is mixed with an acid solution, the mixture is put in an ultrasonic reaction still, the material temperature is controlled to be 80-100 DEG C for reacting, and solid-liquid separation is conducted after reacting to obtain solids; fourth, a microwave reaction is carried out, the ultrasonic reaction product is mixed with auxiliaries to be put into a microwave reaction still, and the material temperature is controlled to be 120-130 DEG C for reacting; and fifth, secondary calcination is conducted. By adoption of the method, the advantages of increasing the dissolution rate of potassium and improving the activity of the potassium are achieved, various kinds of potassium-containing rock can be treated at the same time, sewage discharge are heat exhaustion arereduced, and treatment time is shortened.

Description

technical field [0001] The invention belongs to the technical field of potassium-containing rock treatment, and in particular relates to a method for extracting potassium from potassium-containing rock. Background technique [0002] China's soluble potassium mineral resources are scarce, and the distribution is extremely uneven, but my country's insoluble potassium-bearing rock resources are relatively large, so it is meaningful to study the effective use of insoluble potassium-bearing rock resources. According to the utilization process of water-insoluble stalactite, the utilization method can be divided into three parts: [0003] One is to directly apply potassium-containing rocks to farmland after being ground, but this method wastes a lot of resources and effective resources cannot be fully utilized; [0004] The second is high-temperature roasting method: ① slow-release potassium fertilizer by fire method: directly use potassium feldspar mixed with dolomite, limestone ...

AI Technical Summary

Problems solved by technology

Common additives are fluoride, CaO, CaCO 3 , CaSO 4 , soda ash, caustic soda, etc.; Qiu Longhui et al. mixed potassium feldspar (7.5%) with apatite (10.25%), first extracted phosphoric acid by wet method, removed the water from phosphogypsum, and added CaCO 3 and a small amount of additives, thermally decompose it at 900-950°C for 2 hours, and extract potassium sulfate with water, and the decomposition rate of potassium can reach 90-93%; after analysis, the composition of the residue is similar to that of cement clinker, and can be directly used as cement; Ma Hongwen et al. Insoluble potassium-containing rocks are mixed with soda ash or caustic soda in a certain proportion, sintered at a medium temperature at 750-850°C, and then used caustic soda as ingredients, and extracted by hydrothermal treatment at 98°C to produce potassium carbonate suitable for the production of the electronics industry; but The raw material waste of the wet chemical method is serious, the production cycle is long, and the by-product sewage is difficult to discharge

[0006] Patent No. CN201610907570.8 discloses a method for preparing low-silicon X-type molecular sieves by melting and activating potassium-containing rocks with NaCO-NaOH mixed alkali, but it has no effect on potassium oxide, silicon oxide, aluminum oxide, sodium oxide, and oxynitride in potassium-containing rocks. There are strict requirements on iron content, which makes it necessary to detect the composition of the processed product during processing, making control difficult

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