A kind of method that alkali activates potassium feldspar to prepare soluble potassium and calcium silicate soil conditioner

A technology for activating potassium feldspar and soil conditioner, which is applied in the field of comprehensive utilization of resources, can solve the problems of low potassium extraction rate, serious pollution, and high energy consumption, and achieve the effects of less environmental pollution, low reaction temperature, and less consumption

Active Publication Date: 2021-06-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0004] The object of the present invention is to provide a kind of method that alkali activates potassium feldspar to prepare soluble potassium and calcium silicate soil conditioner, this method solves the large energy consumption of utilizing potassium feldspar to extract soluble potassium process in the prior art, high cost, pollution Serious, low potassium extraction rate and other problems, at the same time, the reaction product is used to prepare a soil conditioner that has beneficial effects on plant growth and soil improvement, and realizes the comprehensive utilization of potassium feldspar with high added value

Method used

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  • A kind of method that alkali activates potassium feldspar to prepare soluble potassium and calcium silicate soil conditioner

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add the prepared potassium hydroxide solution with a mass concentration of 1g / L into the reaction kettle with a cooling device, and add the oxidized Potassium content is 13.94%, silicon dioxide content is the potassium feldspar powder of 66.41% (passes through 100 mesh sieves after being pulverized), and calcium hydroxide is added to adjust the Ca / Si molar ratio in the mixture to be 0.9, and after mixing evenly, react at 190° C. for 6 hours, Stir well, and after the reaction is completed, cool down to below 100°C, and the filtrate obtained after suction filtration of the reaction product is a soluble potassium solution; wash the filter residue slurry twice, and dry the filter residue at 100°C after suction filtration. After testing, K in the filter residue 2 The content of O is 1.6%, and K is calculated 2 The dissolution rate of O was 92.78%; the content of citrate-soluble silica in the filter residue was 26.88%, the content of calcium oxide was 32.01%, and the water c...

Embodiment 2

[0029] The configured potassium hydroxide solution with a mass concentration of 50g / L is added to the reaction kettle with a cooling device, and the oxidation Potassium content is 12.04%, silicon dioxide content is 65.01% potassium feldspar powder (passes through 50 mesh sieves after crushing), and calcium oxide is added to adjust the Ca / Si molar ratio in the mixture to be 0.3, after mixing evenly, react at 210°C for 1h, fully Stir and cool down to below 100°C after finishing the reaction. The filtrate obtained after liquid-solid separation of the reaction product is a soluble potassium solution; wash the filter residue slurry 3 times, and dry the filter residue at 30°C after suction filtration. After testing, K in the filter residue 2 The content of O is 1.75%, calculated K 2 The dissolution rate of O was 91.17%; the content of citrate-soluble silica in the filter residue was 23.06%, the content of calcium oxide was 8.80%, and the moisture content of the filter residue was 3...

Embodiment 3

[0031] The configured potassium hydroxide solution with a mass concentration of 30g / L is added to the reaction kettle with a cooling device, and the oxidation Potassium feldspar powder with a potassium content of 10.21% and a silicon dioxide content of 68.02% (passed through a 80-mesh sieve after crushing), adding calcium hydroxide to adjust the Ca / Si molar ratio in the mixture to 1.5, and reacting at 160°C for 4.5 hours after mixing evenly , fully stirred, after the reaction was completed, the temperature was lowered to below 100°C, and the filtrate after suction filtration of the reaction product was a soluble potassium solution; the filter residue slurry was washed 4 times, and the filter residue was dried at 120°C after suction filtration. After testing, K in the filter residue 2 The content of O is 1.13%, it is calculated that K 2 The dissolution rate of O is 90.00%, the content of citrate-soluble silicon dioxide in the filter residue is 24.06%, the content of calcium ox...

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Abstract

The invention belongs to the field of comprehensive utilization of resources such as chemical industry, metallurgy and environmental protection, and in particular relates to a method for preparing soluble potassium and calcium silicate soil conditioner by alkali-activating potassium feldspar. The invention comprises the following steps: (1) raw material mixing: mixing alkali activator, potassium feldspar and calcium preparation; (2) pressurized reaction: putting the above-mentioned mixture in a pressurized reactor for reaction; (3) liquid-solid separation: After the reactant in step (2) is cooled, liquid-solid separation is carried out to obtain a filtrate to obtain a soluble potassium solution; (4) drying: washing and drying the filter residue filtered in step (3) to obtain calcium silicate soil conditioner. The invention has high potassium extraction rate, and the reaction slag has the characteristics of light weight and high water absorption rate, and is rich in highly active silicon, calcium and a small amount of potassium, and is suitable as a soil conditioner. The process has the advantages of simple operation, low reaction temperature, less environmental pollution, low requirements on equipment, etc., and has good industrialization prospect.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of resources such as chemical industry, metallurgy and environmental protection, and relates to a method for extracting soluble potassium, in particular to a method for preparing soluble potassium and calcium silicate soil conditioner by alkali-activating potassium feldspar. Background technique [0002] my country is rich in potassium ore resources, but the reserves of soluble potassium resources are small and the demand is large. At present, it mainly depends on imports. Potassium feldspar ore is an important insoluble potassium resource in my country. The ore reserves are large and widely distributed, but it is difficult to use it as a soluble potassium resource such as potash fertilizer. Therefore, it is of great significance to develop and utilize insoluble potassium feldspar ore to extract soluble potassium. [0003] At present, there are many kinds of techniques for extracting solu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/04C05G3/80C05D3/02C01D1/02
CPCC01D1/02C05D3/02C05G3/80
Inventor 王晓辉马淑花穆小占赵振清郑诗礼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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