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A method for producing potassium sulfate from magnesium sulfate-metachloride type potassium-containing brine

A technology of chloride and magnesium sulfate, applied in the field of salt chemical industry, can solve the problems of low flotation yield, unsatisfactory process conditions, and low grade of magnesite.

Active Publication Date: 2020-03-31
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with this classification method, the obtained primary carnallite ore has a low sulfur-potassium ratio (mass ratio is lower than 2.5), and cannot reach the ideal process conditions of grinding-conversion-flotation langbeinite, which will easily cause flotation. The selection yield is low and the grade of langbeinite is low, thus affecting the output and quality of potassium sulfate

Method used

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  • A method for producing potassium sulfate from magnesium sulfate-metachloride type potassium-containing brine

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Embodiment 1

[0032] In this embodiment, the magnesium sulfate-partial chloride type potassium-containing salt lake brine is selected from a certain salt lake brine in Qinghai in China, and the original brine composition is as follows: K + 0.415%, Mg 2+ 2.92%, Cl - 14.96%, SO 4 2- 2.80%, Na + 5.18%, H 2 O73.725%.

[0033] (1) Inject the magnesium sulfate-metachloride type potassium-containing brine into the sodium chloride salt field, and let it dry naturally until the epsom salt begins to precipitate, then inject the brine into the epsom salt field, and part of the sodium chloride and epsom After salting, the brine is injected into the first-grade carnallite salt field, and the first-grade carnallite ore is precipitated, which is naturally sun-dried into the brine that meets the second-grade carnallite stage salt field, and then the first-grade carnallite salt field is discharged into the second-grade carnallite salt field Stone salt fields continue to evaporate, and when the brine r...

Embodiment 2

[0047] In this embodiment, the magnesium sulfate-partial chloride type potassium-containing salt lake brine is selected from a certain domestic salt lake brine, and the original brine composition is as follows: K + 0.502%, Mg 2+ 4.32%, Cl - 17.42%, SO 4 2- 3.41%, Na + 4.29%, H 2 O70.058%.

[0048] (1) Inject the magnesium sulfate-metachloride type potassium-containing brine into the sodium chloride salt field, and let it dry naturally until the epsom salt begins to precipitate, then inject the brine into the epsom salt field, and part of the sodium chloride and epsom After salting, the brine is injected into the first-grade carnallite salt field, and the first-grade carnallite ore is precipitated, which is naturally sun-dried into the brine that meets the second-grade carnallite stage salt field, and then the first-grade carnallite salt field is discharged into the second-grade carnallite salt field Stone salt fields continue to evaporate, and when the brine reaches the ...

Embodiment 3

[0059] In this embodiment, the magnesium sulfate-partial chloride type potassium-containing salt lake brine is selected from a certain domestic salt lake brine, and the original brine composition is as follows: K + 0.530%, Mg 2+ 2.62%, Cl - 16.29%, SO 4 2- 2.02%, Na + 6.18%, H 2 O72.36%.

[0060] (1) Inject the magnesium sulfate-metachloride type potassium-containing brine into the sodium chloride salt field, and let it dry naturally until the epsom salt begins to precipitate, then inject the brine into the epsom salt field, and part of the sodium chloride and epsom After salting, the brine is injected into the first-grade carnallite salt field, and the first-grade carnallite ore is precipitated, which is naturally sun-dried into the brine that meets the second-grade carnallite stage salt field, and then the first-grade carnallite salt field is discharged into the second-grade carnallite salt field Stone salt fields continue to evaporate, and when the brine reaches the b...

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Abstract

A method for producing potassium sulfate from magnesium sulfate-metachloride potassium-containing brine comprises the following steps: 1, injecting the magnesium sulfate-metachloride potassium-containing brine into a sodium chloride saltern, and naturally spreading sodium chloride saltern to precipitate primary carnallite ore and secondary carnallite ore; 2, mixing and decomposing the primary carnallite, water or brackish water and a conversion mother liquor, and carrying out conversion, floatation and separation to obtain picromerite concentrate and the conversion mother liquor; 3, mixing the secondary carnallite ore, water or brackish water and the above obtained potassium mixed secondary conversion mother liquor, and carrying out decomposition, separation and washing to obtain crude potassium chloride; and 4, mixing and converting the crude potassium chloride, the picromerite and the water or brackish water. The method has the advantages of no external addition of sulfate ions, no introduction of a floatation agent in the production process of the crude potassium chloride, removal of ore milling and floatation processes, convenience in operation, easiness in control, high raw material utilization rate, no pollution, and reduction of the factory building investment by 10-20%.

Description

technical field [0001] The invention relates to a method for producing potassium sulfate from magnesium sulfate-metachloride type potassium-containing brine, which belongs to the technical field of salt chemical industry. Background technique [0002] Potassium fertilizer is one of the three major fertilizers in agriculture. Potassium sulfate is the most important chlorine-free high-quality potassium fertilizer. It is also an important supplementary source of sulfur required by crops, and its price is lower than potassium nitrate, so it is very popular. Potassium sulfate fertilizer is mainly applied to flax, tobacco, grapes, watermelon, citrus, tea, potato, vegetables and other potassium-preferring crops and seafood farming. It can not only increase the output of agricultural products, but also improve their quality, such as the flammability of tobacco, Fruit sweetness, etc. In addition, potassium sulfate can basically be mixed with all existing fertilizers, and it is easie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/10
CPCC01D5/10C01P2006/80C01P2006/82
Inventor 夏适谢超孙成高汤建良李昱昀甘顺鹏季荣
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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