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A process for producing potassium sulfate from carnallite ore containing epsomite in salt field

A technology for carnallite ore and epsomite salt, which is applied in the field of salt chemical industry, can solve the problems of low flotation yield, low kaleite grade, low sulfur and potassium, etc., and achieves raw material utilization rate without pollution and raw material utilization rate. High and low cost effect

Active Publication Date: 2020-03-31
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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AI Technical Summary

Problems solved by technology

[0005] The above two methods of producing potassium sulfate by using sulfate-type brine are only suitable for raw materials with relatively large sulfur and potassium in raw brine, and corresponding potassium mixed salt and carnallite ore need to be produced in the salt pan
For brines with relatively low sulfur and potassium (especially in Qinghai), and salt field potassium mixed salt mainly produces carnallite ore containing epsomium salt, if this method is used to produce potassium sulfate, the first-grade carnallite ore sulfur obtained from salt fields will Potassium ratio is low (mass ratio SO 4 2- / K + <2.5), the ideal process conditions of grinding conversion-flotation langbeinite can not be reached, and it is easy to cause low flotation yield and low grade of langbeinite, thus affecting the production and quality of potassium sulfate

Method used

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  • A process for producing potassium sulfate from carnallite ore containing epsomite in salt field

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In this case, the sulfate-type brine is selected from a domestic salt lake brine in Qinghai, and the original brine composition is as follows: K + 0.446%, Mg 2+ 3.12%, Cl - 15.11%, SO 4 2- 2.97%, Na + 4.96%, H 2 O73.394%.

[0034] (1) Inject the sulfate-type brine into the sodium chloride salt field and spread it naturally until the diarrhea salt begins to precipitate, then inject the brine into the diarrhea salt salt field. After the diarrhea precipitates part of the sodium chloride and the diarrhea salt, the brine is injected In the first-class carnallite salt field, the first-class carnallite ore is precipitated, and it is naturally spread into brine that meets the second-class carnallite salt field. After the first-class carnallite salt field is discharged, the second-class carnallite salt field is introduced to obtain the first-class carnallite salt field. The quality of carnallite ore, the quality composition of the first grade carnallite ore is as follows: K + 5.52%,...

Embodiment 2

[0048] In this embodiment, the sulfate-type brine is selected from a domestic salt lake brine, and the original brine has the following composition: K + 0.613%, Mg 2+ 2.97%, Cl - 15.33%, SO 4 2- 2.27%, Na + 4.96%, H 2 O73.857%.

[0049] (1) Inject the sulfate-type brine into the sodium chloride salt field and spread it naturally until the diarrhea salt begins to precipitate, then inject the brine into the diarrhea salt salt field. After the diarrhea precipitates part of the sodium chloride and the diarrhea salt, the brine is injected In the first-level carnallite salt field, the first-level carnallite ore is precipitated, and it is naturally spread into brine that meets the second-level carnallite stage salt field to obtain the first-level carnallite mine. The quality composition of the first-level carnallite ore is as follows: K + 7.06%, Mg 2+ 6.52%, Cl - 28.08%, SO 4 2- 16.58%, Na + 7.47%, H 2 O34.29%. After the first-level carnallite salt field is discharged, the second-level c...

Embodiment 3

[0058] In this embodiment, the sulfate-type brine is selected from a domestic salt lake brine in Qinghai, and the composition of the original brine is as follows: K + 0.501%, Mg 2+ 2.41%, Cl - 15.16%, SO 4 2- 1.88%, Na + 5.80%, H 2 O74.249%.

[0059] (1) Inject the sulfate-type brine into the sodium chloride salt field and spread it naturally until the diarrhea salt begins to precipitate, then inject the brine into the diarrhea salt salt field. After the diarrhea precipitates part of the sodium chloride and the diarrhea salt, the brine is injected In the first-grade carnallite salt field, the first-grade carnallite ore is precipitated. The quality composition of the first-grade carnallite ore is as follows: K + 7.25%, Mg 2+ 6.81%, Cl - 26.57%, SO 4 2- 16.78%, Na + 7.93%, H 2 O34.66%. Spread naturally into brine that meets the second-level carnallite salt field, discharge the first-level carnallite salt field and then introduce it into the second-level carnallite salt field, and co...

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Abstract

The invention discloses a process for producing potassium sulfate from salt pan epsom salt-containing carnallite. The process comprises the following steps of (1) injecting sulphate brine into a sodium chloride salt pan, and naturally tedding; (2) crushing secondary carnallite, and performing decomposition, flotation, separation and washing to obtain potassium chloride concentrate and tailings from which potassium chloride is floated out; (3) after crushing primary carnallite, performing decomposition and dehalogenation to obtain picromerite concentrate and a conversion mother solution; (4) mixing the potassium chloride concentrate and the picromerite concentrate to obtain a mixed potassium ore, generating potassium sulfate and a secondary conversion mother solution, and after solid-liquid separation, washing and drying the solid potassium sulfate to obtain a potassium sulfate product, wherein the mother solution obtained through separation is a secondary conversion mother solution. The disadvantage that the carnallite mine with a low sulfur-potassium ratio is used for producing the potassium sulfate in the prior art is overcome by the process disclosed by the invention, and potassium ions and sulfate ions in the tail salt are fully reclaimed, so that the process has the characteristics of low cost, high raw material utilization rate and no pollution.

Description

Technical field [0001] The invention relates to a method for producing potassium sulfate using a carnallite containing diarrhea salt with a low sulfur-to-potassium ratio (mass percentage) produced by evaporation of sulfate type brine as a raw material, and belongs to the technical field of salt chemical industry. Background technique [0002] Potassium sulfate is the basic raw material for the manufacture of various potassium salts such as potassium carbonate and potassium persulfate. It is used as a clearing agent in the glass industry, as an intermediate in the dye industry, and as an auxiliary in the perfume industry. The pharmaceutical industry is also used as a laxative, the treatment of soluble barium salt poisoning, etc. Potassium sulfate is a commonly used potassium fertilizer in agriculture, with a potassium oxide content of 50%, and is commonly known as "Baijiali" in Taiwan. In addition, potassium sulfate is also used in industries such as glass, dyes, perfumes, and me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/10
CPCC01D5/10C01P2006/80
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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