Method for quickly extracting soluble potassium at low temperature

A soluble, low-temperature technology, applied in potash fertilizers, inorganic fertilizers, fertilization devices, etc., can solve the problems of many reaction by-products and slow reaction rate, and achieve the effect of fast reaction rate, low equipment requirements and high extraction rate

Inactive Publication Date: 2012-04-11
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of them have the disadvantages of slow reaction rate and many reaction by-products, which are difficult to be utilized.

Method used

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  • Method for quickly extracting soluble potassium at low temperature
  • Method for quickly extracting soluble potassium at low temperature
  • Method for quickly extracting soluble potassium at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix potassium feldspar powder, NaOH additive and deionized water in a certain ratio (7:1:2), put it in a hydrothermal synthesis reaction kettle (180°C), and place it in a closed oven at a constant temperature (120°C) , take it out after reacting to 0.5 h; cool the product taken out at room temperature and then centrifuge to obtain the supernatant; take 81ml of the supernatant, add 5ml of 3% EDTA solution and 37% formaldehyde solution to the supernatant 10ml, then add 0.1ml of phenolphthalein indicator, adjust to red with 3.9ml of 0.5% NaOH solution, and set the volume to 100ml, heat and boil in the fume hood for 15min, cool, and after standing for 0.5h, the soluble potassium salt can be obtained .

[0027] The potassium extraction rate of the method for extracting soluble potassium from potassium feldspar in Example 1 is 87.65%.

Embodiment 2

[0029] Mix potassium feldspar powder, NaOH additive and deionized water in a certain ratio (5:2:3), put it in a hydrothermal synthesis reactor at 200°C, and react in a closed oven at a constant temperature of 105°C for 1 hour Then take it out; cool the product taken out at room temperature and then centrifuge to obtain a supernatant; take 55ml of the supernatant, add 20ml of 3% EDTA solution and 20ml of 37% formaldehyde solution to the supernatant, and then add 0.3 1 ml of phenolphthalein indicator, adjust to red with 4.7 ml of 0.5% sodium hydroxide solution, set the volume to 100 ml, heat and boil in a fume hood for 15 minutes, cool, and let it stand for 1 hour to obtain soluble potassium salt.

[0030] The potassium extraction rate of the method for extracting soluble potassium from potassium feldspar in Example 2 is 83.52%.

Embodiment 3

[0032] Mix potassium feldspar powder, NaOH additive and deionized water in a certain ratio (8:1:1), put it in a hydrothermal synthesis reaction kettle (200°C), and place it in a closed oven at a constant temperature (100°C) , take it out after reacting to the specified time (1.5h); cool the product taken out at room temperature and then centrifuge to obtain a supernatant; take 80ml of the supernatant, add 8ml of 3% EDTA solution to the supernatant and 10ml of 37% formaldehyde solution, add 0.2ml of phenolphthalein indicator, adjust to red with 1.8ml of 0.5% NaOH solution, set the volume to 100ml, heat and boil in a fume hood for 15min, cool, and stand for 0.5h to prepare Soluble potassium salt.

[0033] The potassium extraction rate of the method for extracting soluble potassium from potassium feldspar in Example 3 is 90.06%.

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Abstract

The invention relates to a method for quickly extracting soluble potassium at low temperature, which comprises the following steps of: uniformly mixing potassium feldspar mineral powder, NaOH assistant and de-ionized water in a certain ratio, placing in a hydrothermal synthesis reactor, reacting in a constant temperature closed oven for defined time and taking out; cooling the extracted product at room temperature, and centrifuging to obtain supernatant; and fixing volume of the supernatant, boiling, cooling and standing to obtain the soluble potassium salt. The NaOH is used as the assistant, so lattice structure in the potassium feldspar can be effectively destroyed to separate out difficultly soluble potassium to obtain soluble potassium; extraction rate reaches up to 93.5%; and this technology has the advantages of simple process, low energy consumption, less pollution, high extraction rate and the like, has quick reaction speed, no deposition, no filtering process, low equipment requirement and better industrial application prospect, and can avoid the defects that the reaction substrate in the technology is difficultly utilized.

Description

technical field [0001] The invention relates to a method for extracting soluble potassium, in particular to a method for rapidly extracting soluble potassium at low temperature. Background technique [0002] In most areas of our country, the phenomenon of potassium deficiency in soil has become the main restrictive factor of crop yield increase. According to the national soil census data, about 70% of the cultivated land in my country is deficient in potassium, and 45% of the cultivated land is seriously deficient in potassium. As the main raw material for the production of potash fertilizers, soluble potash resources have very few reserves in my country and are extremely unevenly distributed. At present, the production capacity of domestic potash fertilizer is far from meeting the demand, so the vast majority of domestic potash fertilizer depends on imports. [0003] However, my country's insoluble potassium resources are relatively rich, and the proven reserves of insolu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05D1/04
Inventor 刘伟宋建国徐双杰王新芝
Owner YANTAI UNIV
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