Comprehensive utilization method for producing potassium sulfate and magnesium resources through magnesium sulfate conversion method

A technology of potassium sulfate and magnesium sulfate, applied in the field of salt chemical industry, can solve the problems of magnesium resource loss, potassium element loss, environmental pollution, etc., and achieve the effects of increasing potassium yield, eliminating pollution, and improving system economic benefits

Active Publication Date: 2016-07-13
NANYANG ORIENTAL APPL CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The above-mentioned research and the proposed process method fail to solve the control problems of wastewater discharge and potassium element loss in the process, the potassium yield is still at a low level, and the production cost is high. At the same time, no comprehensive utilization method of magnesium element in the production process has been proposed. It not only leads to the discharge of a large amount of magnesium-containing wastewater, which pollutes the environment, but also causes the loss of magnesium resources and limits the improvement of potassium yield.

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  • Comprehensive utilization method for producing potassium sulfate and magnesium resources through magnesium sulfate conversion method
  • Comprehensive utilization method for producing potassium sulfate and magnesium resources through magnesium sulfate conversion method

Examples

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Effect test

Embodiment 1

[0041] A comprehensive utilization method for producing potassium sulfate and magnesium resources by a magnesium sulfate conversion method, such as figure 1 shown, including the following steps:

[0042] Step 1: Add 20kg of crude potassium and 25.45kg of potassium chloride with a content of 83.59% to 298kg of potassium sulfate mother liquor and washing water, heat up to 60°C and dissolve completely, then filter to remove water insolubles to obtain potassium chloride solution.

[0043] Then the potassium chloride solution is sent into a one-step reaction process, 222kg of magnesium sulfate heptahydrate and 83kg of coarse langinite are added under stirring conditions, separated after reacting at 60°C for 120min, washed with an appropriate amount of water, and 225kg of langbeinite and zoleinite are obtained. Magneite mother liquor 425kg.

[0044] Step 2: send 425kg langbeinite mother liquor and 139kg coarse langbeinite mother liquor to the evaporating salt field, use natural con...

Embodiment 2

[0053] A comprehensive utilization method for producing potassium sulfate and magnesium resources by a magnesium sulfate conversion method, such as figure 2 shown, including the following steps:

[0054] Step 1: Add 210kg of crude potassium and 170Kg of potassium chloride (containing 90% KCl) to 2160kg of potassium sulfate mother liquor and washing water, heat up to 80°C and dissolve completely, then filter to remove water-insoluble matter to obtain potassium chloride solution.

[0055] Then the potassium chloride solution is sent into a one-step reaction process, 1540kg of magnesium sulfate heptahydrate and 470kg of coarse langinite are added under stirring conditions, separated after reacting at 80°C for 120min, washed with an appropriate amount of water, and 1560kg of langinite and leninite are obtained. Magnesite mother liquor 2990kg.

[0056] Step 2: Send 2990kg of langbeinite mother liquor and 1070kg of coarse langbeinite mother liquor to the evaporation salt field, us...

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Abstract

The invention discloses a comprehensive utilization method for producing potassium sulfate and magnesium resources through a magnesium sulfate conversion method. According to the comprehensive utilization method, the technical measures for controlling a potassium yield in a potassium sulfate production process are that various levels of mother liquor and washing water generated in a production process are recycled in a totally-closed manner. The totally-closed recycling of various levels of mother liquor (wastewater) and the potassium element is realized, so that the potassium yield is increased to be 92% or higher. Meanwhile, old brine is taken as a raw material for preparing basic magnesium carbonate or magnesium hydroxide, so that the magnesium element in the production process is realized to obtain industrial salt, and therefore, the economic benefits of the system are improved, and pollution caused by wastewater discharge to the environment is eliminated.

Description

technical field [0001] The application belongs to the technical field of salt chemical industry, and specifically relates to a magnesium sulfate conversion method to produce potassium sulfate and a comprehensive utilization method of magnesium resources. Background technique [0002] The magnesium sulfate conversion method is one of the important preparation methods of potassium sulfate abroad, but due to the limitation of resource conditions, this method is rarely used in my country. Taking magnesium sulfate and potassium chloride as raw materials to prepare potassium sulfate is realized by two processes, and its process principle is: [0003] According to K + , Mg +2 / / Cl - , SO 4 、-H 2 The phase diagram of the O quaternary interaction system at 25°C was used as the basis for the calculation of ingredients, and then a two-step conversion process was used to prepare potassium sulfate. In the first step, potassium chloride and magnesium sulfate are reacted to prepare l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/10C01D3/04C01F5/24C01F5/22
CPCC01D3/04C01D5/10C01F5/22C01F5/24C01P2006/80
Inventor 肖景波陈居玲夏娇彬
Owner NANYANG ORIENTAL APPL CHEM RES INST
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