Method for preparing picromerite from magnesium sulfate subtype brine

A technology of magnesium sulfate subtype and langbeinite, which is applied in the chemical industry to achieve the effect of simple process operation and low economic cost

Pending Publication Date: 2020-12-08
QINGHAI QAIDAM COMPREHENSIVE GEOLOGICAL & MINERAL EXPLORATION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, there is no relevant report on the met

Method used

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  • Method for preparing picromerite from magnesium sulfate subtype brine
  • Method for preparing picromerite from magnesium sulfate subtype brine
  • Method for preparing picromerite from magnesium sulfate subtype brine

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Embodiment Construction

[0028] The technical solution of the present invention will be described in further detail below in conjunction with the embodiments.

[0029] 1 Test content

[0030] 1.1 Natural scale-up experiment in salt fields to produce potassium mixed salt

[0031] This test is a natural evaporation test in the summer salt field. A total of 6 times of brine irrigation and drying were carried out. The composition of the original brine used is shown in the following table:

[0032] Table 1

[0033]

[0034] According to the characteristics of the brine, combined with the analysis of the phase diagram, the point of the phase diagram of this brine has been located at the three-phase co-saturation point of epsom salt, carnallite, and potassium halite, and there is no separate stage of epsom salt. When K in the mother liquor + When the content reaches 1.5% and the density of the mother liquor is about 1.29, the solid-liquid separation is carried out, and the solid phase is rock salt, whi...

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Abstract

The invention discloses a method for preparing picromerite from magnesium sulfate subtype brine, and belongs to the technical field of chemical engineering. The method comprises the following steps: step 1, preparing potassium mixed salt by a salt pan natural expansion test: naturally evaporating a salt pan in summer, and filling brine and drying for six times in the sun; step 2, carrying out colddecomposition on the potassium mixed salt; step 3, adding epsomite for conversion; and through comparison tests of multiple conversion water quantity and conversion time tests, 0.690 Kg of solids after cold decomposition are selected by taking K<+> recovery rate maximization as an index, and the conversion water quantity is determined to be 62%, the conversion time is determined to be 60min, andthe addition amount of the epsomite is determined to be 130% of a theoretical calculation value, i.e., 30g for the test. The preparation process disclosed by the invention is simple to operate, pollution-free and low in economic cost.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for preparing langbeinite from magnesium sulfate subtype brine. Background technique [0002] langbeinite K 2 SO 4 · MgSO 4 ·6H 2 O is a compound salt containing potassium, sulfur, and magnesium. At present, the main varieties of chlorine-free potassium fertilizers in my country include potassium sulfate, potassium nitrate, potassium dihydrogen phosphate, and potassium magnesium sulfate. The use of salt lake resources mainly produces potassium sulfate and potassium magnesium sulfate fertilizers, and langbeinite is the most critical intermediate raw material. Over the years, scholars have done a lot of research on the preparation of langbeinite. The main preparation processes are: potassium-magnesium mixed salt dissolution-evaporation method, conversion-reverse flotation method, thermal solution-cold crystallization method, cold decomposition - Add mirabilite ...

Claims

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Application Information

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IPC IPC(8): C01D5/12
CPCC01D5/12C01P2006/10
Inventor 靳芳李海明郭敏李文波李得刚李洪普
Owner QINGHAI QAIDAM COMPREHENSIVE GEOLOGICAL & MINERAL EXPLORATION INST
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