Method for utilizing coal ash to prepare slow-release fertilizer
A technology of slow-release fertilizer and fly ash, which is applied in the direction of phosphate fertilizer, application, fertilization equipment, etc., can solve the problems of high cost hindering industrialization, and achieve the effects of low cost, reduced evaporation, and increased water seepage speed
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0031] A kind of method utilizing fly ash to prepare slow-release fertilizer, it is the following steps:
[0032] (1) Grind the fly ash, then pass it through an 80-mesh sieve, add sodium hydroxide and magnesium hydroxide to the obtained under-sieve, then mix evenly, put it into a rotary kiln for calcination, the calcination temperature is 420°C, and the calcination time is For 3h, obtain calcined material;
[0033] (2) Add the calcined material of step (1) into hot water to slurry, then filter to obtain the first filtrate and the first filter residue, add ammonium sulfate solution to the obtained first filter residue, stir at a temperature of 33°C for 55min, and then add phosphoric acid The solution adjusted the pH of the solution to 9.5, then added diammonium hydrogen phosphate, stirred and reacted at a temperature of 32° C. for 2.5 hours, and then filtered to obtain a second filtrate and a second filter residue;
[0034] (3) drying, crushing and screening the second filter ...
Embodiment 2
[0043] A kind of method utilizing fly ash to prepare slow-release fertilizer, it is the following steps:
[0044] (1) Grind the fly ash, then pass it through an 80-mesh sieve, add sodium hydroxide and magnesium hydroxide to the obtained undersieve, then mix it evenly, put it into a rotary kiln for calcination, the calcination temperature is 425°C, and the calcination time is Be 3.5h, obtain calcined material;
[0045] (2) Add the calcined material in step (1) to slurry with hot water, then filter to obtain the first filtrate and the first filter residue, add ammonium sulfate solution to the obtained first filter residue, stir at a temperature of 31°C for 125min, and then add phosphoric acid The solution adjusted the pH of the solution to 9.4, then added diammonium hydrogen phosphate, stirred and reacted at a temperature of 32° C. for 2.3 hours, and then filtered to obtain a second filtrate and a second filter residue;
[0046] (3) drying, crushing and screening the second fil...
Embodiment 3
[0055] A kind of method utilizing fly ash to prepare slow-release fertilizer, it is the following steps:
[0056] (1) Grind the fly ash, then pass it through a 100-mesh sieve, add sodium hydroxide and magnesium hydroxide to the obtained under-sieve, then mix evenly, put it into a rotary kiln for calcination, the calcination temperature is 440°C, and the calcination time is Be 4h, obtain calcined material;
[0057] (2) Add the calcined material in step (1) into hot water to slurry, then filter to obtain the first filtrate and the first filter residue, add ammonium sulfate solution to the obtained first filter residue, stir at a temperature of 33°C for 145min, and then add phosphoric acid The solution adjusted the pH of the solution to 9.8, then added diammonium hydrogen phosphate, stirred and reacted at a temperature of 29° C. for 2.9 hours, and then filtered to obtain a second filtrate and a second filter residue;
[0058] (3) drying, crushing and screening the second filter ...
PUM
Property | Measurement | Unit |
---|---|---|
particle diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com