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Method for preparing magnesium sulfate from tailings produced in extraction of potassium of magnesium sulfate subtype salt lake brine

A magnesium sulfate subtype, salt lake brine technology, applied in magnesium sulfate and other directions, can solve the problems of negative impact on enterprise benefits, insufficient and effective utilization of salt lake resources, etc., to achieve easy large-scale production, realize large-scale production, reduce The effect of water consumption

Active Publication Date: 2013-10-30
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the long run, this will not only make the salt lake resources not be fully and effectively utilized, but also bring negative impacts on the company's profits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 The magnesium sulfate subtype salt lake brine extracts potassium tailings and prepares the method for magnesium sulfate, comprising the following steps:

[0020] ⑴The raw material—the tailings after potassium extraction from magnesium sulfate subtype salt lake brine is crushed with a crusher to a particle size of ≤30mm, and the crushed raw material and filtrate I are mixed at a weight ratio of 1:0.25 (㎏ / ㎏) and put into a ball mill Grinding, and make the solid content of the slurry is 80% when the grinding is completed, and the mineral particle size is 40~130 mesh.

[0021] Among them: the main compound components of tailings after potassium extraction from magnesium sulfate subtype salt lake brine are 65% (g) sodium chloride, 30% (g) magnesium sulfate, and 5% (g) potassium salt.

[0022] Filtrate Ⅰ refers to the solution obtained by mixing magnesium sulfate, magnesium chloride, potassium chloride, sodium chloride, and water at a weight ratio of 1:3.83:0.37:...

Embodiment 2

[0031] Example 2 The magnesium sulfate subtype salt lake brine extracts potassium tailings and prepares the method for magnesium sulfate, comprising the following steps:

[0032] ⑴The raw material—the tailings after potassium extraction from magnesium sulfate subtype salt lake brine is crushed with a crusher to a particle size of ≤30mm, and the crushed raw material and filtrate I are mixed at a weight ratio of 1:0.85 (㎏ / ㎏) and put into a ball mill Grinding, and make the solid content of the slurry be 50% when the grinding is completed, and the mineral particle size is 40~130 mesh.

[0033]Among them: the main compound components of tailings after potassium extraction from magnesium sulfate subtype salt lake brine are 69% (g) of sodium chloride, 21% (g) of magnesium sulfate, and 10% (g) of potassium salt.

[0034] Filtrate Ⅰ refers to the solution obtained by mixing magnesium sulfate, magnesium chloride, potassium chloride, sodium chloride, and water at a weight ratio of 1:...

Embodiment 3

[0043] Example 3 The magnesium sulfate subtype salt lake brine extracts potassium tailings and prepares the method for magnesium sulfate, comprising the following steps:

[0044] ⑴Crush the raw material—the tailings after potassium extraction from magnesium sulfate subtype salt lake brine with a crusher to a particle size of ≤30mm, then mix the crushed raw material and filtrate Ⅰ at a weight ratio of 1:0.55 (㎏ / ㎏) and put it into a ball mill Grinding, and make the solid content of the slurry be 65% when the grinding is completed, and the mineral particle size is 40~130 mesh.

[0045] Among them: the main compound components of tailings after potassium extraction from magnesium sulfate subtype salt lake brine are 70% (g) of sodium chloride, 25% (g) of magnesium sulfate, and 5% (g) of potassium salt.

[0046] Filtrate Ⅰ refers to the solution obtained by mixing magnesium sulfate, magnesium chloride, potassium chloride, sodium chloride, and water at a weight ratio of 1:3.80:0....

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Abstract

The invention relates to a method for preparing magnesium sulfate from tailings produced in extraction of potassium of magnesium sulfate subtype salt lake brine. The method comprises the following steps of 1, crushing tailings produced in extraction of potassium of magnesium sulfate subtype salt lake brine and grinding, 2, carrying out decomposition conversion of slurry obtained by grinding, and carrying out flotation to obtain the slurry subjected to size mixing, 3, carrying out roughing of the slurry subjected to size mixing to obtain rough concentrate slurry and rough tailing slurry, 4, carrying out scavenging of the rough tailing slurry to obtain scavenged concentrate slurry and scavenged tailing slurry, and carrying out solid-liquid separation of the scavenged tailing slurry to obtain tailings mainly containing sodium chloride and a filtrate A, 5, carrying out one-step concentration of the rough concentrate slurry to obtain concentrated concentrate slurry and concentrated tailing slurry, and carrying out solid-liquid separation of the concentrated concentrate slurry to obtain a crude magnesium sulfate product and a filtrate B, and 6, carrying out repulping washing and solid-liquid separation of the crude magnesium sulfate product to obtain a magnesium sulfate product and a filtrate C. The method provided by the invention needs a small investment, is convenient for operation, has a low production cost and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of magnesium sulfate in the technical field of salt lake chemical industry, in particular to a method for preparing magnesium sulfate from magnesium sulfate subtype salt lake brine extracting potassium tailings. Background technique [0002] Magnesium sulfate, usually refers to magnesium sulfate heptahydrate, also known as: Epsom salt, Epsom salt, sulfur bitter, bitter salt, magnesium yellow oxygen, Makuleer, molecular formula: MgSO 4 · 7H 2 O, with a relative molecular weight of 246.48, is an important inorganic chemical product with a wide range of uses. [0003] Magnesium sulfate subtype salt lake brine is based on its main components (K + 、Na + , Mg 2+ , Cl - , SO 4 2- ) content is different, the brine system points according to preliminary statistics in K + 、Na + , Mg 2+ / / Cl - , SO 4 2- -H 2 There are three phase regions in the normal temperature phase diagram of the O pentad metastable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40
Inventor 肖学英张志宏张全有朱建荣王明英常成功董生发马艳芳
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI