Method for producing potassium sulfate from potassium/chlorine-ion-containing solid waste

A technology of potassium sulfate and chloride ions, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal compounds, etc., can solve problems such as large equipment investment, high processing cost, hidden safety hazards in production management, etc. Achieve cost saving, cost reduction and high product quality

Inactive Publication Date: 2015-12-02
莫红兵 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity of the process, large investment in equipment, and high processing costs, this technology has not been popularized and applied so far.
[0007] The invention patents of Mo Hongbing and others (patent application number: 201410493734.8 and patent application number: 201410493419.5) all disclose "a method for...

Method used

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  • Method for producing potassium sulfate from potassium/chlorine-ion-containing solid waste
  • Method for producing potassium sulfate from potassium/chlorine-ion-containing solid waste
  • Method for producing potassium sulfate from potassium/chlorine-ion-containing solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Remove impurities

[0033] To the leaching wastewater containing potassium and chloride ion solid waste (main component: K 2 O content is 5.1%, Cl ion content is 5.9%), add saturated lime water to adjust the pH value=7.5 of solution, after stirring and removing impurity 60min, add ammonium bicarbonate (addition is 0.09% of solution weight) in solution , after stirring for 60 minutes to remove impurities, filter, and the filtrate enters the buffer tank for later use.

[0034] 2. Concentration

[0035] Add the impurity removal solution in the buffer tank to the three-effect falling film evaporator and concentrate to K + The content is 128g / L, and the concentrate enters the buffer tank.

[0036] 2. Potassium sulfate formation reaction

[0037]The concentrate in the buffer tank is added to the reaction tank, and simultaneously add the ammonium sulfate solid (the mass ratio of ammonium sulfate and potassium ion=2.7) of solution weight 34.8% and the potassium sulfate c...

Embodiment 2

[0057] 1. Remove impurities

[0058] To the leaching wastewater containing potassium and chloride ion solid waste (main component: main component: K 2 O content is 5.1%, Cl ion content is 5.9%), add saturated lime water to adjust the pH value=9.0 of solution, after stirring and removing impurity 60min, add ammonium bicarbonate (addition is 0.12% of solution weight) in solution , after stirring for 60 minutes to remove impurities, filter, and the filtrate enters the buffer tank for later use.

[0059] 2. Concentration

[0060] Add the impurity removal solution in the buffer tank to the three-effect falling film evaporator and concentrate to K + The content is 128g / L, and the concentrate enters the buffer tank.

[0061] 2. Potassium sulfate formation reaction

[0062] The concentrate in the buffer tank is added to the reaction tank, and the ammonium sulfate solid (the mass ratio of ammonium sulfate and potassium ion=2.7) and 1.21% of the potassium sulfate crystal growth acce...

Embodiment 3

[0076] 1. Remove impurities

[0077] To the leaching wastewater containing potassium and chloride ion solid waste (main component: main component: K 2 O content is 5.1%, Cl ion content is 5.9%), add saturated lime water to adjust the pH value=10.0 of solution, after stirring and removing impurity 60min, add ammonium bicarbonate (addition is 0.15% of solution weight) in solution , after stirring for 60 minutes to remove impurities, filter, and the filtrate enters the buffer tank for later use.

[0078] 2. Concentration

[0079] Add the impurity removal solution in the buffer tank to the three-effect falling film evaporator and concentrate to K + The content is 128g / L, and the concentrate enters the buffer tank.

[0080] 2. Potassium sulfate formation reaction

[0081] The concentrated solution in the buffer tank is added to the reaction tank, and the ammonium sulfate solid (the mass ratio of ammonium sulfate and potassium ion=3.05) and 1.0% of the potassium sulfate crystal ...

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Abstract

The invention discloses a method for producing potassium sulfate from potassium/chlorine-ion-containing solid waste, which comprises the following steps: adding water, leaching, adding an alkaline matter and soluble carbonate for impurity removal, and concentrating to obtain a concentrated solution with the K<+> concentration of 100 g/L or above; and adding ammonium sulfate into the concentrated solution, adding a mixture of sodium tripolyphosphate, ammonium monoacid phosphate, magnesium sulfate, urea and sodium salt, reacting to obtain a potassium sulfate precipitate, carrying out solid-liquid separation to obtain wet potassium sulfate and a filtrate, drying to obtain a potassium sulfate product, carrying out concentration and crystallization on the filtrate twice, and drying to obtain a potassium-nitrogen compound fertilizer product. The method is simple and safe, has the advantages of high efficiency, lower cost and high potassium sulfate product quality, does not need any alcohol substance to perform precipitation, and meanwhile, can coproduce the potassium-nitrogen compound fertilizer which satisfies the national standard.

Description

technical field [0001] The invention belongs to the field of waste water recycling in circular economy, and in particular relates to a method for producing potassium sulfate by using solid waste containing potassium and chloride ions as raw materials. Background technique [0002] Domestic research on the comprehensive utilization technology of sintering dust removal ash and gas ash started relatively late, and the treatment technology is relatively backward, which cannot meet the requirements of efficient recycling of iron and steel solid waste resources. At present, most iron and steel enterprises adopt the method of directly blending it into the sintered material for comprehensive utilization. Since the alkali metal and heavy metal impurity elements in the electrostatic precipitator dust of the sintering head were not removed during the utilization process, the impurity elements were gradually enriched during the recycling process, which caused a series of new environment...

Claims

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Application Information

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IPC IPC(8): C01D5/00
Inventor 莫红兵陈志周念
Owner 莫红兵
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