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A kind of low-temperature microwave hydrothermal desiliconization method of potassium feldspar
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A technology of microwave hydrothermal and potassium feldspar, which is applied in the direction of aluminum silicate and silicate, can solve the problems of high energy consumption and environmental pollution, and achieve the effects of reducing reaction temperature, shortening reaction time, and reducing energy consumption
Active Publication Date: 2017-10-27
SHAANXI DAQIN POTASSIUM CO LTD
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These methods usually have high energy consumption and are easy to cause environmental pollution.
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Embodiment 1
[0016] A method for low-temperature microwave hydrothermal desilication of potassium feldspar, comprising the following steps:
[0017] In step 1, the potassium feldspar ore is crushed and pretreated by mineral processing, and then ground to obtain potassium feldspar powder with a particle size of <1000 μm.
[0018] Step 2: After heating 0.5g of potassium feldspar powder to 500°C, immediately mix it with 40ml of KOH aqueous solution with a concentration of 4mol / L, then microwave hydrothermal reaction at 120°C for 0.5h, then filter and wash And drying, the desiliconization rate of potassium feldspar reaches 66%.
Embodiment 2
[0020] A method for low-temperature microwave hydrothermal desilication of potassium feldspar, comprising the following steps:
[0021] In step 1, the potassium feldspar ore is crushed and pretreated by mineral processing, and then ground to obtain potassium feldspar powder with a particle size of <1000 μm.
[0022] Step 2: After heating 0.5g of potassium feldspar powder to 700°C, immediately mix it with 80ml of KOH aqueous solution with a concentration of 8mol / L, then microwave hydrothermal reaction at 180°C for 2h, filter, wash and After drying, the desiliconization rate of potassium feldspar reaches 73%.
Embodiment 3
[0024] A method for low-temperature microwave hydrothermal desilication of potassium feldspar, comprising the following steps:
[0025] In step 1, the potassium feldspar ore is crushed and pretreated by mineral processing, and then ground to obtain potassium feldspar powder with a particle size of <1000 μm.
[0026] Step 2: After heating 0.5g of potassium feldspar powder to 600°C, immediately mix it with 60ml of KOH aqueous solution with a concentration of 4mol / L, then microwave hydrothermal reaction at 150°C for 1h, filter, wash and After drying, the desiliconization rate of potassium feldspar reaches 68%.
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Abstract
The invention discloses a low-temperature microwave hydrothermal desiliconization method for potassium feldspar, and belongs to the field of chemical production. The method comprises the following steps: 1) after crushing and ore dressing pretreatment of potassium feldspar ores, grinding the potassium feldspar ores to prepare potassium feldspar powder with the particle size less than 1,000 microns; and 2) heating the potassium feldspar powder to 500-700 DEG C, immediately mixing the potassium feldspar powder with a KOH aqueous solution, then performing a microwave hydrothermal reaction, and performing filtering, washing and drying to prepare desiliconized kalsilite powder. Compared with conventional hydrothermal method and solid reaction method, the method provided by the invention has the advantages that the reaction time is greatly shortened, the reaction temperature is reduced, the production cost and energy are saved, and the purpose of quickly removing silicon in the potassium feldspar within a relatively short time at a relatively low temperature can be achieved.
Description
technical field [0001] The invention belongs to the field of chemical production, and in particular relates to a low-temperature microwave hydrothermal desiliconization method for potassium feldspar. Background technique [0002] my country's water-soluble potassium salt resources are extremely scarce, but the reserves of water-insoluble potassium mineral resources are huge, such as potassium feldspar. Potassium nepheline formed after desiliconization of potassium feldspar is a kind of soluble potassium resource. At present, potassium feldspar can be prepared by hydrothermal desiliconization technology. For example, the patent No. 201010543249.9 is published. Potassium feldspar powder and KOH are hydrothermally reacted at 220-280°C for 2-8 hours, and can be desiliconized to obtain Potassium nephrite powder. The main research methods for preparing potassium salt from potassium feldspar at home and abroad include: high-temperature roasting method, molten salt method and low-...
Claims
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