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Method for preparing nitrogen-potassium compound fertilizer and metallurgical-grade aluminum oxide from alunite

A technology for alumina and alunite, applied in chemical instruments and methods, preparation of alkali metal aluminate/alumina/aluminum hydroxide, potassium fertilizer, etc., can solve the problem of high cost of calcination and dehydration, poor economy, and unindustrialization of aluminum and potassium Implementation and other issues to achieve the effect of low cost, improved potassium removal rate, and low cost

Pending Publication Date: 2021-08-31
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other methods require calcining and dehydration of alunite to stimulate its activity to extract its aluminum and potassium. The cost of calcining and dehydration is high and the economy is poor.
Therefore, the technology for extracting aluminum and potassium from alunite has not been implemented industrially

Method used

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  • Method for preparing nitrogen-potassium compound fertilizer and metallurgical-grade aluminum oxide from alunite
  • Method for preparing nitrogen-potassium compound fertilizer and metallurgical-grade aluminum oxide from alunite
  • Method for preparing nitrogen-potassium compound fertilizer and metallurgical-grade aluminum oxide from alunite

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Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing nitrogen-potassium compound fertilizer and metallurgical-grade alumina from alunite, comprising the steps of:

[0042] Step 1. Select the alunite after mechanical activation: select the alunite powder below 100 meshes. If there is no ready-made alunite powder that meets the requirements, mechanically activate the alunite by crushing and high-frequency grinding. Grind to below 100 mesh;

[0043] Step 2, ammonia solution depotassiation: mix the selected mechanically activated alunite powder with ammonia solution, the concentration of ammonia water is 30%, the molar ratio of ammonia solute to alunite is 8, react at 50°C for 120 minutes for depotassiation, Potassium enters the liquid phase in the form of potassium sulfate;

[0044] Step 3, separation of potassium-removing liquid: the slurry after dissolving potassium in ammonia is separated and washed by centrifugation, the liquid phase is ammonium sulfate and potassium sulfate solution, and the soli...

Embodiment 2

[0048] A method for preparing nitrogen-potassium compound fertilizer and metallurgical-grade alumina from alunite, comprising the steps of:

[0049] Step 1, select the alunite after mechanical activation: select the alunite powder below 100 meshes, if there is no ready-made alunite powder that meets the requirements, the alunite is crushed and mechanically activated by high-energy ball milling, and the particle size is ground to Below 100 meshes; step 2, ammonia dissolution and depotassium removal: mix the selected mechanically activated alunite powder with ammonia solution, the concentration of ammonia water is 10%, the molar ratio of the solute of ammonia water to alunite is 6, and react at 200°C for 5 Depotassium is carried out in minutes, and potassium enters the liquid phase in the form of potassium sulfate;

[0050] Step 3, separation of potassium-removing liquid: the slurry after dissolving potassium in ammonia is separated and washed by sedimentation and separation, th...

Embodiment 3

[0054] A method for preparing nitrogen-potassium compound fertilizer and metallurgical-grade alumina from alunite, comprising the steps of:

[0055] Step 1, select the alunite after mechanical activation: select the alunite powder below 100 mesh, if there is no ready-made alunite powder that meets the requirements, then mechanically activate the alunite by crushing and cutting pump milling, the particle size grinding to less than 100 mesh;

[0056] Step 2, ammonia solution depotassiation: mix the selected mechanically activated alunite powder with ammonia solution, the concentration of ammonia water is 20%, the molar ratio of ammonia solute to alunite is 7, react at 120°C for 60 minutes for depotassiation , potassium enters the liquid phase in the form of potassium sulfate;

[0057] Step 3, separation of potassium-removing liquid: the slurry after dissolving potassium in ammonia is separated and washed by filtration and separation, the liquid phase is ammonium sulfate and pot...

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Abstract

The invention relates to a method for preparing a nitrogen-potassium compound fertilizer and metallurgical-grade aluminum oxide from alunite. The method comprises the following steps: selection of alunite: selecting alunite powder with a particle size of 100 meshes or less; dissolving via ammonia for potassium removal: mixing the selected alunite powder with an ammonia water solution, subjecting the formed mixture to reacting for 5-120 minutes at a temperature of 50-200 DEG C so as to realize potassium removal, and allowing potassium to enter a liquid phase in the form of potassium sulfate; separation of depotassication liquid : carrying out solid-liquid separation and washing on slurry obtained after potassium is dissolved in ammonia to obtain a liquid phase which is an ammonium sulfate-potassium sulfate solution and a solid phase which is a depotassication solid phase; preparation of metallurgical-grade aluminum oxide from the depotassication solid phase through a Bayer method: preparing metallurgical-grade sandy aluminum oxide from the depotassication solid phase, which mainly comprises aluminum oxide and silicon oxide, through the Bayer method; and preparation of the compound fertilizer: concentrating, crystallizing and drying the depotassication liquid phase to obtain the nitrogen-potassium compound fertilizer. According to the method, efficient separation of potassium, aluminum and silicon can be achieved, the nitrogen-potassium compound fertilizer and metallurgical-grade aluminum oxide products are prepared, and industrialization is facilitated.

Description

technical field [0001] The invention relates to a method for separating and utilizing alunite mineral elements, in particular to a method for preparing nitrogen-potassium compound fertilizer and metallurgical-grade alumina from alunite. Background technique [0002] The proven reserves of alunite mineral resources in my country rank third in the world, and the overall reserves are abundant, mainly concentrated in Zhejiang and Anhui provinces, accounting for about 90% of the total reserves of alunite mines in the country, and high-grade mines with a grade greater than 45%. Most of them are concentrated in these two provinces, among which Zhejiang alunite mines account for 50% of the country's proven reserves. Using alunite to produce potassium sulfate, alumina and other products is an effective way to improve the comprehensive utilization rate of resources and alleviate the contradiction between supply and demand of potassium fertilizer. In areas where soluble potassium salts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C01F7/06
CPCC05C3/00C01F7/0693C05D1/02
Inventor 李来时吴玉胜
Owner SHENYANG POLYTECHNIC UNIV