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Pressurized acid-leaching potassium extracting technology for potassium feldspar

A technology of acid leaching and potassium feldspar, which is applied in the preparation of calcium/strontium/barium sulfate, sulfate/bisulfate, alkali metal aluminate/alumina/aluminum hydroxide, etc. Problems such as complex recycling methods, difficulties in industrial application, and high difficulty in comprehensive utilization can achieve the effects of reducing raw material consumption, no hidden dangers of environmental pollution, and reducing sulfuric acid consumption

Inactive Publication Date: 2013-07-10
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkaline high-temperature calcination has problems such as high energy consumption and difficulty in comprehensive utilization. However, the current fluorine chemical method that uses fluosilicic acid, hydrofluoric acid, and fluoride equal to sulfuric acid reaction also has the method of recycling fluorine, potassium in potassium feldspar, etc. , aluminum, and silicon utilization methods
Since the current fluorine chemical method adopts the normal pressure decomposition method, silicon tetrafluoride and hydrogen fluoride are volatile, resulting in a relatively large amount of fluorosilicic acid, hydrofluoric acid, and fluoride that need to be recycled, resulting in high energy consumption and high cost. High; the efficient recycling of fluorine in the current fluorine chemical method is relatively complicated, resulting in high costs for the utilization of aluminum and silicon in potassium feldspar, making it difficult for the current large-scale industrial application of the fluorine chemical method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: The weight ratio of raw materials is potassium feldspar: fluorosilicic acid: sulfuric acid: circulating dilute sulfuric acid = 1: 0.5: 0.7: 0.5, and enters into the reactor for reaction. The potassium feldspar contains 12% potassium oxide, and the particle size is 150 mesh; the concentration of the fluosilicic acid is 20%; the concentration of the sulfuric acid is 98.3%; Filtrate after potassium alum. In the reactor, the reaction temperature is 130°C, the pressure is 0.2MPa, the reaction time is 3 hours, and the heat required for the reaction passes through: 1) sulfuric acid dilution exotherm, 2) jacket or heat exchanger heating, 3) Preheating sulfuric acid, 4) heating methods such as 1) and 4) to obtain steam. The reacted material in the reactor enters the rotary kiln continuously to complete the dehydration and defluorination of the reaction material. The temperature range in the rotary kiln is 100-400°C, the movement direction of the material and hot air ...

Embodiment 2

[0044] Example 2: The weight ratio of raw materials is potassium feldspar: fluorosilicic acid: sulfuric acid: circulating dilute sulfuric acid = 1: 0.25: 0.9: 0.3, and enters into the reactor for reaction. The potassium feldspar contains 12% potassium oxide, and the particle size is 150 mesh; the concentration of the fluosilicic acid is 25%; the concentration of the sulfuric acid is 90%; Filtrate after potassium alum. In the reactor described above, the reaction temperature is 120°C, the pressure is 0.2MPa, the reaction time is 5 hours, and the heat required for the reaction passes through: 1) sulfuric acid dilution exotherm, 2) jacket or heat exchanger heating, 3) Preheating sulfuric acid, 4) heating methods such as 2) and 4) to obtain steam. The reacted material in the reactor enters the rotary kiln continuously to complete the dehydration and defluorination of the reaction material. The temperature range in the rotary kiln is 120-400°C, the movement direction of the materi...

Embodiment 3

[0045] Embodiment 3. The weight ratio of raw materials is potassium feldspar: fluorosilicic acid: sulfuric acid: circulating dilute sulfuric acid = 1: 0.9: 0.8: 0.6, and enters into the reactor for reaction. The potassium feldspar contains 13% potassium oxide, and the particle size is 150 mesh; the concentration of the fluosilicic acid is 30%; the concentration of the sulfuric acid is 80%; Filtrate after potassium alum. In the reactor, the reaction temperature is 140°C, the pressure is 0.3 MPa, the reaction time is 2 hours, and the heat required for the reaction passes through: 1) sulfuric acid dilution exotherm, 2) jacket or heat exchanger heating, 3) Preheating sulfuric acid, 4) heating methods such as steaming, etc. 3) Obtained. The reacted material in the reactor enters the rotary kiln continuously to complete the dehydration and defluorination of the reaction material. The temperature range in the rotary kiln is 100-450°C, the movement direction of the material and hot a...

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Abstract

The invention discloses a pressurized acid-leaching potassium extracting technology for potassium feldspar. Products such as potassium sulphate, aluminum hydroxide, quartz and gypsum are obtained from the raw materials such as potassium feldspar powder, fluorosilicic acid, sulfuric acid and cyclic dilute sulphuric acid. The pressurized acid-leaching potassium extracting technology disclosed by the invention is low in sulfuric acid consumption, high in percent conversion, low in reaction temperature, small in energy consumption in production, and low in potassium extraction cost; and various ingredients in potassium feldspar ore are comprehensively utilized.

Description

technical field [0001] The invention belongs to the technical field of ore leaching, and in particular relates to a potassium feldspar pressurized acid leaching process for potassium. Background technique [0002] The extraction of potassium fertilizer from potassium feldspar mine is of great strategic significance to solve the world and China's agricultural potassium fertilizer demand. There have been many research methods. The main research technology routes include potassium carbonate, lime and other alkaline high-temperature calcination methods, fluosilicic acid, Fluorine chemical method in which hydrofluoric acid, fluoride, etc. react with sulfuric acid. Alkaline high-temperature calcination has problems such as high energy consumption and difficulty in comprehensive utilization. However, the current fluorine chemical method that uses fluosilicic acid, hydrofluoric acid, and fluoride equal to sulfuric acid reaction also has the method of recycling fluorine, potassium in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/02C01F7/14C01F11/46
Inventor 旷戈林诚刘善军郭慧林荣英罗文斌李宝霞
Owner FUZHOU UNIV
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