Preparation method of materials for deammonization of pyrophosphate compounds and application in deammonization of sewage

A pyrophosphate and compound technology, which is applied in the field of preparation of pyrophosphate compound deammonium materials, can solve the problems of large adsorption capacity of calcium and magnesium ions, large adsorption amount, affecting normal operation and the like

Active Publication Date: 2020-07-07
TIANJIN BISHUIYUAN MEMBRANE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the adsorption capacity of zeolite adsorbent is very low, only 4-5 mg / g, resulting in too large adsorption capacity and frequent regeneration; the adsorption of cation exchange resin to cations in water is preferentially high-priced cations, and the adsorption capacity of calcium and magnesium ions is larger, and It is seriously polluted by charged organic matter, which eventually leads to a decrease in adsorption capacity and affects normal operation

Method used

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  • Preparation method of materials for deammonization of pyrophosphate compounds and application in deammonization of sewage
  • Preparation method of materials for deammonization of pyrophosphate compounds and application in deammonization of sewage
  • Preparation method of materials for deammonization of pyrophosphate compounds and application in deammonization of sewage

Examples

Experimental program
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Embodiment 1

[0050] Weigh 7mol of zinc chloride, dissolve in 1L of deionized water, stir well, adjust the pH value to 1, and obtain a zinc chloride solution; add 3mol of solid sodium chloride in the zinc chloride solution, stir well, Dissolve sodium chloride completely in the zinc chloride solution to obtain a mixed solution of zinc chloride and sodium chloride; take 7 mol of sodium dihydrogen phosphate, add it to the mixed solution, stir evenly, and put it in an oven at 50°C Dry to obtain crystals; grind the crystals into powder, put them into a muffle furnace and heat at 400°C for 8 hours, use nitrogen for atmosphere protection during the heating process, and after cooling to room temperature, repeatedly wash and remove impurities with deionized water, and dry , that is, pyrophosphate compound deammonization material Na 2 ZnP 2 o 7 .

Embodiment 2

[0052] Weigh 4mol of copper chloride, dissolve in 1L of deionized water, stir well, adjust the pH value to 1, and obtain copper chloride solution; add 2mol of solid sodium chloride in the copper chloride solution, stir well, Dissolve sodium chloride completely in the copper chloride solution to obtain a mixed solution of copper chloride and sodium chloride; take 6 mol of sodium dihydrogen phosphate, add it to the mixed solution, stir evenly, and put it in an oven at 55°C Dry to obtain crystals; grind the crystals into powder, put them into a muffle furnace and heat at 500°C for 10 hours, use nitrogen for atmosphere protection during the heating process, and after cooling to room temperature, repeatedly wash and remove impurities with deionized water, and dry , that is, pyrophosphate compound deammonization material Na 2 CuP2 o 7 .

Embodiment 3

[0054] Weigh 5mol of nickel sulfate, dissolve it in 1L of deionized water, stir evenly, and adjust the pH value to 2 to obtain a nickel sulfate solution; add 1mol of solid potassium chloride to the nickel sulfate solution, stir well, and make the chloride Potassium is completely dissolved in the nickel sulfate solution to obtain a mixed solution of nickel sulfate and potassium chloride; 5 mol of potassium dihydrogen phosphate is added to the mixed solution, stirred evenly, and dried in an oven at 60°C to obtain a crystal Grind the crystals into powder, put them into a muffle furnace and heat at 550°C for 15 hours, use nitrogen to protect the atmosphere during the heating process, after cooling to room temperature, repeatedly wash with deionized water to remove impurities, and dry to obtain pyrophosphoric acid Salt compound deammonization material K 2 NiP 2 o 7 .

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Abstract

The invention provides a pyrophosphate compound deammoniation material, and belongs to the technical field of polluted water deammoniation. The chemical formula of the pyrophosphate deammoniation compound is A2MP2O7, wherein A is Na+ or K+, and M is one of Zn2+, Cu2+, Ni2+, Co2+, Mn2+ or Fe2+. The preparing method of the deammoniation material comprises the steps of preparing a transition metal salt solution, and adjusting the pH value to be 1-3; adding a chloride solid into the transition metal salt solution to obtain a mixed solution of transition metal salt and chloride; taking a certain mass of dihydric phosphate corresponding to chloride, adding dihydric phosphate into the mixed solution, uniformly stirring the mixture, and putting the mixture into a drying oven to be dried and obtain a crystal; grinding the crystal into powder, heating the powder, cooling the heated powder, cleaning the powder to remove impurities, and then drying the powder to obtain the pyrophosphate compound deammoniation material. The preparing technology is simple, the production cost is low, the yield is high, and the pyrophosphate compound deammoniation material is free of toxicity and environmentally friendly, and high in ammonium ion adsorption capacity and adsorption selectivity, can be recycled, and is stable in performance.

Description

technical field [0001] The invention relates to the technical field of deammonization of sewage, in particular to a preparation method of a material for deammonization of pyrophosphate compounds and its application in deammonization of sewage, which is suitable for large-scale popularization and application of deammonization of industrial sewage. Background technique [0002] As people pay more attention to ammonia nitrogen pollution, a variety of separation methods are applied to the ammonia nitrogen removal process, mainly including physical methods, such as: distillation, reverse osmosis; chemical methods, such as: electrochemical oxidation, alkali stripping, Breakpoint chlorination method, chemical precipitation method, ion exchange method, etc.; biological method, such as: nitrification and denitrification method, etc. In actual engineering applications, factors such as stability, high efficiency and practicality need to be considered, and a composite process for ammoni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01J20/30C02F1/28C02F101/16
CPCB01J20/048C02F1/281C02F2101/16
Inventor 陈亦力孟晓冬莫恒亮李锁定李天玉肖宏康代攀杨志涛张国军高士强许鑫
Owner TIANJIN BISHUIYUAN MEMBRANE MATERIAL CO LTD
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