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Process for preparing potassium molecular sieve based slow-release fertilizer carrier from potassium feldspar powder

A technology of potassium feldspar powder and slow-release fertilizers, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of lack of quantitative evaluation of adverse effects on crop growth, etc., and achieve easy implementation and promotion, low cost of raw materials, and no environmental pollution Effect

Inactive Publication Date: 2010-07-21
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the zeolites currently used as carriers for slow-release fertilizers are all sodium-type molecular sieves, whether they are natural zeolites or synthetic zeolites, and there is no quantitative evaluation of the adverse effects of Na+ on crop growth.

Method used

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  • Process for preparing potassium molecular sieve based slow-release fertilizer carrier from potassium feldspar powder
  • Process for preparing potassium molecular sieve based slow-release fertilizer carrier from potassium feldspar powder
  • Process for preparing potassium molecular sieve based slow-release fertilizer carrier from potassium feldspar powder

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Embodiment 1

[0025] as attached figure 1 As shown in Table 1, the chemical composition analysis results of potassium feldspar powder obtained from Nishi syenite in a certain place as raw material and containing potassium feldspar > 90% are shown in Table 1. Its X-ray powder diffraction analysis results are attached figure 2 shown. The Nihui syenite ore is crushed and ground to -200 mesh > 90% particle size, mixed with potassium carbonate at a mass ratio of 1:0.7, and sintered in a box-type electric furnace at a sintering temperature of 820-860°C. After 3 hours, a light gray (aluminum) potassium silicate sintered material was obtained. The above-mentioned sintered material is ground and then mixed with water in a reaction kettle at a mass ratio of 1:2.5, stirred evenly, and reacted at a constant temperature at 100°C for 2 hours, and then the reacted slurry is placed in a water bath and heated at 85°C CO 2 , until the pH value of the slurry drops to about 9, then filter and wash the fil...

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Abstract

The invention relates to a process for preparing potassium molecular sieve based slow-release fertilizer carrier from potassium feldspar powder. The process comprises the following steps of: crushing raw potassium feldspar ores, grinding, carrying out ore dressing pretreatment to obtain the potassium feldspar powder of a certain granularity, then mixing the potassium feldspar powder with potassium carbonate based on a certain ratio, and sintering at 750-900 DEG C; hydrothermally leaching the sintered potassium silicate or potassium aluminate materials at 100-200 DEG C, and introducing CO2 to slurry obtained after the hydrothermal leaching at 70-90 DEG C until the pH value is reduced to 8-9; filtering the slurry, and washing a filter cake; mixing the carbon filter cake with potassium hydroxide and water, stirring, hydrothermally crystallizing, filtering, washing, and drying an obtained solid at 105 DEG C to obtain the product of compound powder of an L-type molecular sieve and a facellite phase, which can be used as a potassium composite molecular sieve based slow-release fertilizer carrier material. The invention has the advantages of low material cost, no three wastes (waste gas,waste water, industrial residue) discharge in the process and no pollution to the environment and facilitates the implementation and the generalization.

Description

technical field [0001] The invention relates to a method for preparing a potassium-type composite molecular sieve-based slow-release fertilizer carrier by using potassium feldspar powder, in more detail, it is a method for preparing a slow-release fertilizer carrier of a mixture phase of L-type molecular sieve and nepheline by using potassium feldspar powder method. Background technique [0002] At present, slow-release fertilizers widely used at home and abroad are mainly prepared by organic coating method, and its production cost is at least 1-2 times higher than that of ordinary fertilizers; and the production process of coated fertilizers is relatively complicated, and industrial research and development lag behind. There are also few studies on the environmental effects and evaluation of fertilizer application. Therefore, the use of mineral-based carriers to prepare slow-release fertilizers has received increasing attention. Zeolite molecular sieves are now widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 马鸿文杨静苏双青杨雪郑红
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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