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Preparing method of picromerite by adopting mother liquor of potassium sulfate production by conversion method and sodium sulfate as raw materials

A technology of Magnesite and Potassium Sulfate, applied in the field of production technology for preparing Magnesite, and achieves the effects of high obtaining rate, less investment and less production cost

Inactive Publication Date: 2014-09-03
陈兆华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the recovery rate of potassium in the production process is only about 60%, and the remaining mother liquor is returned to the salt field

Method used

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  • Preparing method of picromerite by adopting mother liquor of potassium sulfate production by conversion method and sodium sulfate as raw materials
  • Preparing method of picromerite by adopting mother liquor of potassium sulfate production by conversion method and sodium sulfate as raw materials
  • Preparing method of picromerite by adopting mother liquor of potassium sulfate production by conversion method and sodium sulfate as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: produce langbeinite with A mother liquor and Glauber's salt metathesis

[0050] Potassium sulfate mother liquor produced by potassium chloride and Glauber's salt, washing liquid when adding carnallite to produce potassium chloride, then adding Glauber's salt to produce kaleidite, potassium sulfate mother liquor, potassium chloride washing liquid, Glauber's salt composition are shown in Table 1, use K + 、Na + , Mg 2+ / SO 4 2- , Cl - ---H 2 The metastable phase diagram of the five-component system at 25°C is calculated, and the result of calculation is based on the composite point after mixing as the composition point of langbeinite: Glauber's salt 500g, potassium sulfate mother liquor: 1.07L, potassium chloride washing solution: 0.945L, after mixing, stir at 20-25°C, react for 2 hours, and carry out solid separation. The obtained solid 576g contains 15.21% of potassium ions, which is the wet product of langbeinite, and the recovery rate of potassium i...

Embodiment 2

[0053] Embodiment 2: B mother liquor and Glauber's salt metathesis produce kaleinite

[0054] Potassium chloride and magnesium sulfate produce the mother liquor of potassium sulfate and Glauber's salt to produce langbeinite, the composition of potassium sulfate mother liquor and Glauber's salt are shown in Table 2, utilize K + 、Na + , Mg 2+ / SO 4 2- , Cl - ---H 2 The metastable phase diagram of the O quinary system at 25°C was calculated, and the result was calculated based on the composite point after mixing as the composition point of langbeinite: Glauber's salt: 500g, potassium sulfate mother liquor: 2.225L, after mixing, at 20 Stir at ~25°C, react for 2 hours, and carry out solid separation. The obtained solid is 580g, containing potassium ions: 16.63%. The composition of the langbeinite and sodium chloride saturated solution is shown in Table 2, and the mother liquor can continue to be evaporated to recover the lenbeinite.

[0055] Table 2

[0056]

Embodiment 3

[0057] Embodiment 3: C mother liquor and Glauber's salt metathesis produce kaleinite

[0058] Potassium sulfate mother liquor, Glauber's salt composition are shown in Table 3, utilize K + 、Na + , Mg 2+ / SO 4 2- , Cl - ---H 2 The metastable phase diagram of the O quinary system at 25°C is calculated, and the result of the calculation is based on the composite point after mixing as the composition point of langbeinite: Glauber's salt: 300g, potassium sulfate mother liquor: 1.160L, after mixing, at 20 Stir at a temperature of ~25°C, convert the reaction for 2 hours, and carry out solid separation. The obtained solid is 360g, containing potassium ions: 17.79%, which is the wet product of lenbeinite, and the recovery rate of potassium is 54.30%; the remaining mother liquor is 1.05L It is a saturated solution of langbeinite and sodium chloride, the composition of which is shown in Table 3, and the mother liquor can be continuously evaporated to recover lenbeinite.

[0059] ta...

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Abstract

The invention discloses a preparing method of picromerite by adopting a mother liquor of potassium sulfate production by a conversion method and sodium sulfate as raw materials. The preparing method includes: mixing the potassium sulfate mother liquor and anhydrous sodium sulfate or a saturated sodium sulfate solution to obtain a mixed solution, or successively mixing the potassium sulfate mother liquor with magnesium-containing brine or magnesium-containing salts, anhydrous sodium sulfate or the saturated sodium sulfate solution to obtain the mixed solution; performing a replacement reaction at 0-67.5 DEG C; subjecting the reaction slurry after the reaction is finished to solid-liquid separation so as to obtain solid that is the picromerite; subjecting the separated liquid to evaporation or evaporation to dryness to precipitate a salt mixture of the picromerite and sodium chloride; and separating the picromerite from the sodium chloride by a direct flotation method or a reverse flotation method after the salt mixture is smashed. The preparing method plays a supporting role for the product quality of potassium sulphate production in the former section, and has characteristics of extremely low investment, production cost and energy consumption and high yield.

Description

technical field [0001] The invention belongs to the field of inorganic salt industry, and in particular relates to a production process for preparing langbeinite by using the mother liquor of potassium sulfate produced by a conversion method and sodium sulfate as raw materials. Background technique [0002] At present, the main methods for producing potassium sulfate in the domestic inorganic salt industry are: [0003] 1, produce potassium sulfate with potassium chloride and sodium sulfate by conversion method (one-stage conversion method, two-stage conversion method), the total conversion rate (obtaining rate) of potassium is 57.7%, "Salt Industry Handbook" the 1687th page; [0004] 2, produce potassium sulfate with Repone K and Magnesium Sulphate with conversion method (one-stage conversion method, two-stage conversion method), the total conversion rate (acquisition rate) of potassium is 67.75%, "Salt Industry Handbook" the 1682nd page; [0005] 3. Production of potassiu...

Claims

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Application Information

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IPC IPC(8): C01D5/12
Inventor 陈兆华陈默
Owner 陈兆华
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