Method for extracting potassium from potassium feldspar through calcium-based quaternary roasting treatment

A technology of potassium feldspar and roasting, applied in the field of potassium feldspar, can solve the problems of restricting agricultural production development, lack of potassium in the land, lack of potassium salt resources, etc. Effect

Inactive Publication Date: 2016-07-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, my country's potassium salt resources are extremely scarce, and the phenomenon of land potassium deficiency is becoming more and more serious, which seriously restricts the development of my country's agricultural production.

Method used

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  • Method for extracting potassium from potassium feldspar through calcium-based quaternary roasting treatment

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Effect test

Embodiment 1

[0025] Present embodiment 1 is the roasting process of calcium-based quaternary mixed material, specifically as follows:

[0026] 1. Take 10g potassium feldspar particles, 25g calcium carbonate and 3g calcium sulfate, mix the materials evenly, grind to 100 mesh, add a small amount of pure water and compact;

[0027] 2. Put the compacted mixture into a muffle furnace, first dry it at 100°C for 1 hour, then raise the temperature to 800°C at a rate of 6°C / min, and roast it for 2 hours to obtain 34.24g of solid slag;

[0028] 3. Dissolve the solid slag with 200ml of pure water, stir at a controlled temperature of 60°C (stirring frequency: 30-80r / min) for 2 hours, filter the mixed solution and add 200ml of pure water to wash the filter residue to obtain potassium sulfate solution;

[0029] 4. The potassium sulfate solution is passed through a cold water bath, and the temperature is controlled at 10° C. for crystallization until no potassium sulfate crystals are produced. Filter th...

Embodiment 2

[0032] Present embodiment 2 is the roasting process of calcium-based quaternary mixed material, specifically as follows:

[0033] 1. Take 10g potassium feldspar particles, 25g calcium carbonate and 3g calcium sulfate, mix the materials evenly, grind to 100 mesh, add a small amount of pure water and compact;

[0034] 2. Put the compacted mixture into a muffle furnace, first dry it at 100°C for 1 hour, then raise the temperature to 900°C at a rate of 6°C / min, and roast it for 2 hours to obtain 30.32 g of solid slag;

[0035] 3. Dissolve the solid slag with 200ml of pure water, stir at a controlled temperature of 60°C (stirring frequency: 30-80r / min) for 2 hours, filter the mixed solution and add 200ml of pure water to wash the filter residue to obtain potassium sulfate solution;

[0036] 4. The potassium sulfate solution is passed through a cold water bath, and the temperature is controlled at 8° C. for crystallization until no potassium sulfate crystals are produced. Filter th...

Embodiment 3

[0039] Present embodiment 3 is the roasting process of calcium-based quaternary mixed material, specifically as follows:

[0040] 1. Take 10g potassium feldspar particles, 34g calcium carbonate and 3g calcium sulfate, mix the materials evenly, grind to 100 mesh, add a small amount of pure water and compact;

[0041] 2. Put the compacted mixture into a muffle furnace, first dry it at 100°C for 1 hour, then raise the temperature to 1000°C at a rate of 6°C / min, and roast it for 2 hours to obtain 37.72g of solid slag;

[0042] 3. Dissolve the solid slag with 200ml of pure water, stir at a controlled temperature of 60°C (stirring frequency: 30-80r / min) for 2 hours, filter the mixed solution and add 200ml of pure water to wash the filter residue to obtain potassium sulfate solution;

[0043] 4. Pass the potassium sulfate solution through a cold water bath, and control the temperature at 5° C. for crystallization until no potassium sulfate crystals are produced. Filter the solution,...

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Abstract

The invention provides a method for extracting potassium from potassium feldspar through calcium-based quaternary roasting treatment.The method includes the following steps that firstly, roasting of mixed materials is carried out, wherein 50-100-mesh potassium feldspar particles are adopted, limestone is added at the proportion of 1:1-1:3, then calcium sulfate is added at the proportion of 1:2-1:4, sodium sulfate serves as an additive with the addition quantity of 3%-7%, the mixed materials are mixed evenly and ground into 100-200-mesh particles, roasting is carried out at 800-1200 DEG C, the reaction time is controlled to be 1-3 h, and slag is obtained; secondly, crystallization of a potassium sulfate solution is carried out, wherein the slag is dissolved with pure water at 400-100 DEG C and stirred for 1-3 h, filtering is carried out, and potassium sulfate filter liquor is obtained; the filter liquor is crystallized, filtered and dried in sequence, and potassium sulfate is obtained.The method is simple in process, low in energy consumption and suitable for large-scale production.

Description

technical field [0001] The invention relates to potassium feldspar, in particular to a method for extracting potassium by using limestone calcium sulfate and sodium sulfate additives to mix and roast potassium feldspar. Background technique [0002] Potassium is an essential nutrient element for plant growth and development, and has an important impact on the yield and quality of crops. However, my country's potassium salt resources are extremely scarce, and the phenomenon of land potassium deficiency is becoming more and more serious, which seriously restricts the development of my country's agricultural production. At present, my country's soluble potassium resources are extremely scarce, but insoluble potassium resources are extremely rich. Represented by potassium feldspar mines, if this part of potassium resources can be effectively utilized, the contradiction between the supply and demand of potassium fertilizer in my country can be alleviated to a large extent. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00
CPCC01D5/00
Inventor 张光旭韩洋邓军
Owner WUHAN UNIV OF TECH
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