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

A chlorine ion and solid waste technology, applied in the direction of sulfate/bisulfate preparation, etc., can solve the problems of unreported waste water utilization technology, failure to be popularized and applied, complicated process, etc., and achieve low production cost, small investment, Good effect on operational safety

Inactive Publication Date: 2015-01-07
XIANGTAN TIANZHI TECH
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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 appl

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
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Effect test

Embodiment 1

[0043] 1. Remove impurities

[0044] To the leaching wastewater containing potassium and chloride ion solid waste (main component: K 2 O content is 4.7%, Cl ion content is 5.8%), add lime (add-on is 0.08% of solution weight) and regulate the pH value=11.5 of solution, after stirring and removing impurity 60min, add ammonium carbonate (add-on) in solution again 0.08% of the solution weight), after stirring for 60 minutes to remove impurities, filter, and the filtrate enters the buffer tank for subsequent use.

[0045] 2. Sulfation reaction

[0046] Add the solution in the buffer tank to the reaction tank, and simultaneously add 5.2% ammonium sulfate by solution weight (the molar ratio of ammonium sulfate to potassium chloride=1.85). After stirring for 180 min, the solution enters the potassium sulfate precipitation process.

[0047] 3. Potassium sulfate precipitation

[0048] The solution after the sulfation reaction is completed is added to the potassium sulfate precipitati...

Embodiment 2

[0058] 1. Remove impurities

[0059] To the leaching wastewater containing potassium and chloride ion solid waste (main component: K 2 O content is 4.9%, Cl ion content is 6.0%), add potassium hydroxide (add-on is 0.1% of solution weight) and regulate the pH value=13.5 of solution, after stirring and removing impurities 90min, add salt of wormwood in solution again ( The addition amount is 0.15% of the solution weight), after stirring for 70 minutes to remove impurities, filter, and the filtrate enters the buffer tank for standby.

[0060] 2. Sulfation reaction

[0061] Add the solution in the buffer tank to the reaction tank, and add 5.8% ammonium sulfate (the molar ratio of ammonium sulfate to potassium chloride=2.05) at the same time. After stirring for 150 minutes, the solution enters the potassium sulfate precipitation process.

[0062] 3. Potassium sulfate precipitation

[0063] Add the solution after the sulfation reaction to the potassium sulfate precipitation tank,...

Embodiment 3

[0073] 1. Remove impurities

[0074] To the leaching wastewater containing potassium and chloride ion solid waste (main component: K 2 O content is 9.2%, Cl ion content is 11.6%), add sodium carbonate (add-on is 1.5% of solution weight) and regulate the pH value=14 of solution, after stirring and removing impurity 90min, add ammonium carbonate (addition) in solution again The amount is 0.08% of the solution weight), after stirring for 90 minutes to remove impurities, filter, and the filtrate enters the buffer tank for subsequent use.

[0075] 2. Sulfation reaction

[0076] Add the solution in the buffer tank to the reaction tank, and add 11.7% ammonium sulfate (the molar ratio of ammonium sulfate to potassium chloride=2.5) at the same time. After stirring for 240 minutes, the solution enters the potassium sulfate precipitation process.

[0077] 3. Potassium sulfate precipitation

[0078] The solution after the sulfation reaction is completed is added to the potassium sulfat...

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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: leaching potassium/chlorine-ion-containing solid waste with water, wherein the potassium/chlorine ions and other soluble impurity ions enter the water to form a potassium-chloride-containing mixed solution; adding an alkaline matter into the mixed solution to regulate the pH value of the solution, thereby performing primary impurity removal; adding soluble carbonate into the solution to perform secondary impurity removal; carrying out solid-liquid separation; adding ammonium sulfate into the filtrate; after the sulfating reaction, adding alcohol to precipitate potassium sulfate; after the potassium sulfate precipitation reaction, carrying out solid-liquid separation; drying the filter residue to obtain the potassium sulfate product; adding the filtrate into a concentration and crystallization device to perform concentration and crystallization, and carrying out solid-liquid separation, wherein the filter residue is the potassium-containing ammonium chloride product. By using the method, the recovery rate of K2O in the product is not less than 91% in the potassium-chloride-containing mixed solution.

Description

Technical field: [0001] The invention relates to a method for producing potassium sulfate from solid waste containing potassium and chloride ions produced in the production process of iron and steel enterprises, and belongs to the field of recycling economic waste water resources. 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 cau...

Claims

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Application Information

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IPC IPC(8): C01D5/08
Inventor 莫红兵陈志周念
Owner XIANGTAN TIANZHI TECH
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