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High value-added method for comprehensively utilizing silicon, aluminum and potassium in potassium feldspar ore

A high value-added, potassium feldspar technology, applied in the direction of chemical instruments and methods, applications, silicon oxide, etc., can solve the problems of large discharge of filter residue, difficulty in potassium, high equipment requirements, etc., to reduce discharge of residue, reduce waste, The effect of simple method

Pending Publication Date: 2019-02-12
BOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The high-temperature volatilization method has high energy consumption, it is difficult to recover potassium in the form of vapor, and the economic benefit is low
The biggest disadvantage of the molten salt ion exchange method is that the discharge of filter residue is large and has no industrial application value.
The high-pressure hydration process is complex and requires high equipment
The hydrothermal decomposition method requires a large amount of liquid, and the evaporation energy consumption is high for the subsequent preparation of potassium-containing products
The low temperature decomposition method produces a large amount of hydrogen fluoride and ammonia, causing equipment corrosion and environmental pollution

Method used

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  • High value-added method for comprehensively utilizing silicon, aluminum and potassium in potassium feldspar ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The potash feldspar ore is crushed, pulverized to below 80 μm, and mixed evenly with sodium hydroxide. The quantity ratio of potash feldspar ore and sodium hydroxide substance is: the silicon dioxide in potash feldspar ore completely reacts with sodium hydroxide to produce sodium silicate and the amount of sodium hydroxide substance consumed is calculated as 1, and potassium Feldspar ore: Sodium hydroxide is 1:1.5. The mixed materials are roasted at 400℃ and kept for 3h.

[0046] The roasted clinker obtained after the reaction was dissolved by adding 3 times the mass of 0.5mol / L sodium hydroxide solution, stirred at 50°C for 40 minutes, and filtered. The filtrate is an alkali solution containing sodium silicate, and the filter residue is potassium nepheline, washed Wait for subsequent treatment after drying.

[0047] Add the clinker leaching solution to the impurity removing agent calcium oxide, control its concentration to 0.1g / L, and place it in the reaction kettle, and h...

Embodiment 2

[0054] The potash feldspar ore is crushed, pulverized to below 80 μm, and mixed evenly with sodium hydroxide. The quantity ratio of potash feldspar ore and sodium hydroxide substance is: the silicon dioxide in potash feldspar ore completely reacts with sodium hydroxide to produce sodium silicate and the amount of sodium hydroxide substance consumed is calculated as 1, and potassium Feldspar ore: Sodium hydroxide is 1:1.2, roast the mixed material at 500℃ and keep it warm for 1.5h.

[0055] The roasted clinker obtained after the reaction was dissolved by adding 4 times the mass of 0.3mol / L sodium hydroxide solution, and stirred at 60°C for 80% m in, filter, the filtrate is an alkali solution containing sodium silicate, and the filter residue is potassium cremite, which is washed and dried for subsequent treatment.

[0056] Add the clinker leaching solution to the impurity removal agent calcium chloride, control its concentration to 0.1g / L, and place it in the reaction kettle, and hy...

Embodiment 3

[0063] The potash feldspar ore is crushed, pulverized to below 80 μm, and mixed evenly with sodium hydroxide. The quantity ratio of potash feldspar ore and sodium hydroxide substance is: the silicon dioxide in potash feldspar ore completely reacts with sodium hydroxide to produce sodium silicate and the amount of sodium hydroxide substance consumed is calculated as 1, and potassium Feldspar ore: Sodium hydroxide is 1:1, roast the mixed material at 600℃ and keep it for 0.5h.

[0064] The roasted clinker obtained after the reaction was dissolved by adding 5 times the mass of 0.2mol / L sodium hydroxide solution, stirred at 95°C for 60 minutes, and filtered. The filtrate was an alkali solution containing sodium silicate, and the filter residue was potassium nepheline, washed Wait for subsequent treatment after drying.

[0065] Add the clinker leaching solution to the impurity removing agent calcium silicate, control its concentration to 0.1g / L, and place it in the reaction kettle, and ...

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Abstract

The invention relates to a high value-added method for comprehensively utilizing silicon, aluminum and potassium in potassium feldspar ore. The method comprises the following steps: (1) crushing and grinding the potassium feldspar ore, then mixing the ground potassium feldspar ore with sodium hydroxide, and roasting; (2) leaching roasted clinker, and filtering to obtain a sodium silicate solutionand kaliophilite; (3) carrying out impurity removal, deep purification and carbonation decomposition on the sodium silicate solution to obtain high purity silicon dioxide; (4) carrying out high temperature crystallization to obtain high purity quartz sand; (5) acidizing the kaliophilite with sulfuric acid, dipping into water, and precipitating aluminum to obtain aluminum hydroxide powder; (6) calcining the aluminum hydroxide to prepare aluminum oxide; (7) crystallizing the solution subjected to aluminum precipitation to obtain potassium ammonium sulfate compound fertilizer. The method providedby the invention is simple in process, not high in requirements for equipment and lower in production cost, and realizes the high value-added comprehensive utilization of the silicon, the aluminum and the potassium in the potassium feldspar ore; the whole technological process does not cause secondary pollution to the environment, and meets the requirements of green industrial production.

Description

Technical field [0001] The invention belongs to the field of high-efficiency utilization of mineral resources, and particularly relates to a method for comprehensively utilizing silicon, aluminum and potassium in potash feldspar ore with high added value. Extract silicon, aluminum and potassium from potash feldspar ore to prepare high-purity quartz sand, alumina, potassium ammonium sulfate products, and realize the comprehensive development and utilization of potash feldspar resources. Background technique [0002] With the continuous improvement of my country's agricultural production conditions, the increasing application of nitrogen and phosphorus fertilizers, the continuous increase of crop yields, and the rapid decrease of potassium in the soil. According to the investigation of my country's land conditions conducted by the Chinese Academy of Agricultural Sciences, potassium deficiency has become a major constraint on crop production in many areas. my country is a country s...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01F7/44C01F7/06C01D5/02C05C3/00
CPCC01B33/12C01D5/02C01F7/06C01F7/441C05C3/00
Inventor 刘佳囡常龙娇刘连利徐姝颖王莉丽常春黄建帝
Owner BOHAI UNIV
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