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Method for producing potassium carbonate by using solid wastes containing potassium and chlorine ions

A chloride ion and solid waste technology, which is applied to the removal of solid waste, alkali metal carbonate, chemical instruments and methods, etc., can solve the problems of unreported waste water utilization technology, and achieves low production cost and good operation safety. , the effect of simple process

Inactive Publication Date: 2015-01-21
XIANGTAN TIANZHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There is no report on the wastewater utilization technology for the treatment of gas ash containing potassium and chloride ions

Method used

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  • Method for producing potassium carbonate by using solid wastes containing potassium and chlorine ions
  • Method for producing potassium carbonate by using solid wastes containing potassium and chlorine ions
  • Method for producing potassium carbonate by using solid wastes containing potassium and chlorine ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Remove impurities

[0049] 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 the potassium permanganate of solution weight 0.3, oxidation reaction 90min, then add unslaked lime (add-on is 0.08% of solution weight) to adjust the pH value=11.5 of solution, After stirring and removing impurities for 60 minutes, add ammonium carbonate (the addition amount is 0.08% of the solution weight) to the solution, stir and remove impurities for 60 minutes, filter, and the filtrate enters the buffer tank for subsequent use.

[0050] 2. Carbonation reaction

[0051] Add the solution in the buffer tank to the reaction tank, and simultaneously add 5.2% ammonium carbonate (the molar ratio of ammonium carbonate to potassium chloride=1.85) of the solution weight. After stirring for 180 min, the solution enters the potassium carbonate precipitation process.

[0052] 3. Potassium carbonate pre...

Embodiment 2

[0063] 1. Remove impurities

[0064] 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 the hydrogen peroxide of solution weight 4% (hydrogen peroxide concentration is 35%) in), oxidation reaction 180min, then add potassium hydroxide (addition is 0.1% of solution weight) Adjust the pH value of the solution to 13.5, stir to remove impurities for 90 minutes, then add potassium carbonate (the addition amount is 0.15% of the solution weight) to the solution, stir to remove impurities for 70 minutes, filter, and the filtrate enters the buffer tank for later use.

[0065] 2. Carbonation reaction

[0066] Add the solution in the buffer tank to the reaction tank, and add 5.8% ammonium carbonate (the molar ratio of ammonium carbonate to potassium chloride=2.05) of the solution at the same time. After stirring for 150 minutes, the solution enters the potassium carbonate precipitation process....

Embodiment 3

[0078] 1. Remove impurities

[0079] 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 the sodium hypochlorite of solution weight 0.6% in), oxidation reaction 120min, then add sodium carbonate (addition is 1.5% of solution weight) and adjust the pH value=14 of solution, stir After removing impurities for 90 minutes, add ammonium carbonate (the addition amount is 0.08% of the solution weight) to the solution, stir and remove impurities for 90 minutes, filter, and the filtrate enters the buffer tank for subsequent use.

[0080] 2. Carbonation reaction

[0081] Add the solution in the buffer tank to the reaction tank, and add 11.7% ammonium carbonate (the molar ratio of ammonium carbonate to potassium chloride=2.5) of the solution weight at the same time. After stirring for 240min, the solution enters the potassium carbonate precipitation process.

[0082] 3. Potassium carbonate pre...

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Abstract

The invention discloses a method for producing potassium carbonate by using solid wastes containing potassium and chlorine ions. The method comprises the following steps: leaching the solid wastes containing potassium and chlorine ions by using water, wherein potassium and chlorine ions as well as other soluble impure ions enter into water to form a mixed solution containing potassium chloride; adding an oxidizing agent into the mixed solution, then adding alkaline substances after oxidization, and adjusting the pH value and alkalinity of the solution for edulcoration for the first time; further adding a certain weight of soluble carbonate for edulcoration for the second time; carrying out solid-liquid separation; adding ammonium salt into the filtrate, and after carbonation reaction, adding alcohols to settle potassium carbonate; after precipitation reaction of potassium carbonate, carrying out solid-liquid separation; drying the filter residues to obtain a potassium carbonate product; and adding the filtrate into concentration and crystallization equipment for concentration and crystallization, and carrying out solid-liquid separation to obtain the filter residue which is an ammonium chloride product containing potassium. By virtue of the method, the recovery rate of K2O in the mixed solution containing potassium chloride in the product is less than 92.5% and the purity of potassium carbonate is not less than 96.5%.

Description

Technical field: [0001] The invention relates to a method for producing potassium carbonate from solid waste containing potassium and chloride ions generated in the production process of iron and steel enterprises, and belongs to the field of waste water resource utilization in circular economy. 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 pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00B09B3/00
Inventor 莫红兵陈志周念
Owner XIANGTAN TIANZHI TECH
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