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Process method for preparing potassium salt and byproduct magnesium salt by using corn soaking liquid

A technology of corn soaking water and process method, applied in chemical instruments and methods, alkali metal sulfite/sulfite, magnesium hydroxide, etc., can solve high-salt wastewater calcium chloride wastewater is difficult to treat, and potassium ions are effectively recovered. , environmental protection issues and other issues, to achieve the effect of increasing sustainable and stable operation, realizing zero discharge of sewage, and avoiding high-salt wastewater

Pending Publication Date: 2021-12-03
ZHUCHENG HAOTIAN PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these extraction methods in the prior art do not reasonably and effectively recover the potassium ions in the corn soaking water, and then produce high-salt wastewater or calcium chloride wastewater that is difficult to treat, which brings environmental problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Get the supernatant 600L of corn soaking water after 4h subsidence, (in the supernatant, potassium ion content is 0.55%, magnesium ion content is 0.15%), enters cationic resin exchange column adsorption potassium ion with 1.5BV / h flow rate , the resin model is 001*16, and the volume is 50L; the adsorption effluent is used for the extraction and separation of other products such as phytic acid, protein, lactic acid, etc.

[0029] (2) Adsorption saturated cationic resin exchange column, after water is set to push out the residual corn soaking water, enter 1.5BV of ammonium chloride solution with ammonium ion concentration of 2mol / L to analyze the resin, after entering, enter 1.5BV of water to wash the resin column; analyze the flow rate 0.5BV / h.

[0030] (3) The analysis solution is transferred to the MVR continuous concentration crystallizer for vacuum concentration and crystallization; the concentrated crystal solution is transferred to the transfer tank, separated ...

Embodiment 2

[0033] (1) Get the supernatant 600L (0.55% of potassium ion content in the supernatant liquid, magnesium ion content is 0.15%) after 4h subsidence of corn soaking water, enter cationic resin exchange column adsorption potassium ion with 1.8BV / h flow rate, The resin model is 001*16, and the volume is 50L; the adsorption effluent is used for the extraction and separation of other products such as phytic acid, protein, lactic acid, etc.

[0034] (2) Adsorption saturated cationic resin exchange column, after water is set to push out the residual corn soaking water, enter 1.8BV of ammonium sulfate solution with ammonium ion concentration of 2mol / L to analyze the resin, and then enter 1.8BV of water to wash the resin column after entering; the analysis flow rate is 0.6 BV / h.

[0035] (3) The analysis solution is transferred to the MVR continuous concentration crystallizer for vacuum concentration and crystallization; the concentrated crystal solution is transferred to the transfer t...

Embodiment 3

[0038](1) Get the supernatant 600L (0.55% of potassium ion content in the supernatant liquid, magnesium ion content is 0.15%) after 4h subsidence of corn soaking water, enter cationic resin exchange column adsorption potassium ion with 1.6BV / h flow rate, The resin model is 001*16, and the volume is 50L; the adsorption effluent is used for the extraction and separation of other products such as phytic acid, protein, lactic acid, etc.

[0039] (2) Adsorption saturated cationic resin exchange column, after water is set to push out the residual corn soaking water, enter 1.5BV of sodium sulfate solution with a sodium ion concentration of 2mol / L to analyze the resin, and then enter 1.5BV of water to wash the resin column; the analysis flow rate is 0.8 BV / h.

[0040] (3) The analysis solution is transferred to the MVR continuous concentration crystallizer for vacuum concentration and crystallization; the concentrated crystal solution is transferred to the transfer tank, separated fro...

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Abstract

The invention discloses a process method for preparing sylvite and byproduct magnesium salt by using corn soaking liquid, which comprises the following steps: (1) feeding a supernatant, obtained by standing and settling treatment of corn soaking liquid, into a strong acid cationic resin exchange column for adsorption; (2) adsorbing the saturated cationic resin exchange column, ejecting residual corn soaking liquid by using water, analyzing by using an ammonium salt desorption agent or a sodium salt desorption agent, and collecting a desorption solution; (3) carrying out vacuum concentration crystallization, centrifugal separation and washing on the desorption solution to obtain a finished product potassium salt; (4) adding a magnesium removal reagent into the centrifugal mother liquor, and stirring the liquid for reaction to obtain a magnesium salt byproduct; (5) adjusting the pH value of the filtrate to 3-5 by using concentrated hydrochloric acid, and recovering the filtrate to the next batch of prepared desorption agent. According to the method, low-price ammonium salt and sodium salt are used as desorption agents to obtain a potassium salt product and a magnesium salt byproduct with high additional values, wherein the high-salt crystallization mother liquor is used as a desorption agent of the next batch for mechanical application, so that high-salt wastewater is prevented from being generated, and zero discharge of sewage is realized.

Description

technical field [0001] The invention relates to the technical field of corn deep processing, in particular to a separation and extraction technology of corn soaking water. Background technique [0002] Potassium is an indispensable element for crop growth, and 95% of the world's potash products are used as fertilizers. my country's proven potassium reserves only account for 2.6% of the world's total reserves, and it is a country with poor potassium resources. The source of potash fertilizer mainly depends on imports, and the imbalance of potash fertilizer ratio seriously restricts the development of my country's agricultural economy. Therefore, it is of great economic and strategic significance to develop and utilize potassium resources other than minerals to make up for the serious shortage of potassium resources in my country and thereby increase agricultural output. At present, there are two important varieties in the domestic potash fertilizer market: potassium sulfate...

Claims

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Application Information

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IPC IPC(8): C01D3/04C01D5/00C01F5/20
CPCC01D3/04C01D5/00C01F5/20C01P2006/80Y02P20/10
Inventor 朱理平崔鑫王超何报春曲松杰王银花
Owner ZHUCHENG HAOTIAN PHARMA
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