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Method for desalting of aqueous solution containing high-concentration sodium nitrate and/or potassium nitrate

A technology of sodium nitrate and potassium nitrate, which is applied in chemical instruments and methods, neutralized water/sewage treatment, water/sewage treatment, etc., can solve the problems of high energy consumption, achieve economical saving, environmental protection, simple operation, and simple equipment Effect

Active Publication Date: 2016-04-13
北京能泰高科环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The evaporation-crystallization method also needs to provide enough energy to vaporize water, and the energy consumption is also relatively large.

Method used

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  • Method for desalting of aqueous solution containing high-concentration sodium nitrate and/or potassium nitrate
  • Method for desalting of aqueous solution containing high-concentration sodium nitrate and/or potassium nitrate

Examples

Experimental program
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Effect test

Embodiment 1

[0018] At 25–30°C, 16.7g NaNO 3 Dissolve in 100mL water (NaNO at 25°C 3 The saturation solubility is about 91gNaNO 3 / 100g water), under vigorous stirring, dropwise add 2.521g85%H 3 PO 4 , while adding 3.679g CaO to control the pH of the solution to 7–7.5. After the addition is complete, let stand, settle and filter to remove the precipitate containing sodium nitrate. In the XRD pattern of this precipitate (see attached figure 1 ), at 2θ=29.42°, 31.84°, 35.40°, 38.98°, etc., there are obvious characteristic diffraction peaks of sodium nitrate (refer to PDF#36-1474).

[0019] The weight of the precipitate is about 12.8g. According to nitrogen element analysis and inductively coupled plasma emission spectrometry (ICP), the N content of the precipitate is 8.28wt%, the Na content is 13.5%, and the removal rate is estimated to be about 38%.

Embodiment 2

[0021] At 10–15°C, 19.0g KNO 3 Dissolve in 100mL water (KNO at 10°C 3 The saturated solubility is about 21gKNO 3 / 100g water), under strong stirring, add 6.8g Ca (H 2 PO 4 ) 2 ·H 2 O and 4.4g Ca(OH) 2 , to control the pH of the solution to 7.5–8.0. After the dropwise addition was complete, stirring was continued for 1 hour. After that, it was allowed to stand, settle and filter to remove the precipitate containing potassium nitrate. In the XRD pattern of this precipitate (see attached figure 2 ), at 2θ=23.42°, 29.24°, 32.22°, 33.70°, 41.02°, etc., there are obvious characteristic diffraction peaks of potassium nitrate (refer to PDF#05-0377).

[0022] The weight of the precipitate is about 18.1g. According to elemental analysis, the N content is 7.38wt%, and the K content is about 20.5wt%. It is estimated that KNO 3 The removal rate is about 50.5%.

Embodiment 3

[0024] At room temperature, 10gKNO 3 Dissolve in 100mL of water, add 30g of 85% H 3 PO 4 , while adding 12.0 g of CaO, stirring vigorously and controlling the pH of the solution to 8–8.5. After the addition was complete, stirring was continued for 0.5 hours. After that, it was allowed to stand, settle and filter to remove the precipitate containing potassium nitrate. The XRD patterns and attached figure 2 resemblance.

[0025] The weight of the precipitate is about 35.6g. According to the elemental analysis, the N content is 1.1wt%, and the K content is 2.8wt%. It is estimated that KNO 3 The removal rate is about 28.3%

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Abstract

A method for desalting of an aqueous solution containing high-concentration sodium nitrate and / or potassium nitrate comprises the steps of 1, adding a calcic reagent and a phosphorus reagent to the aqueous solution to be treated containing sodium nitrate and / or potassium nitrate and controlling the pH value of the aqueous solution to be treated to be 6-8.5 in an alternate or simultaneous mode at the temperature of 0-35 DEG C, so that mixed liquid is obtained, wherein the concentration of sodium nitrate and / or potassium nitrate is high but lower than the saturated solubility thereof; 2, conducting still standing of the mixed liquid till precipitation, and separating sediment containing nitrate, so that desalting is achieved. The method has the advantages that equipment is simple, investment is low, adopted materials are economical and easy to obtain, operation is easy, and no harmful element is introduced to the system; separated sediment is a valuable mineral substance too and can be recycled, and economy and environment protection are both realized; the technology can be widely applied to treatment of wastewater which contains high-concentration sodium nitrate and / or potassium nitrate and is discharged from fine chemical engineering, biochemical engineering, papermaking, tanning and other fields.

Description

technical field [0001] The invention relates to the waste water treatment field of environmental technology, in particular to a desalination method containing high-concentration sodium nitrate and / or potassium nitrate aqueous solution. Background technique [0002] With the development of industry, the total discharge of industrial wastewater has increased dramatically. Fine chemical industry, biochemical industry, papermaking, tanning and other fields often discharge high-salt wastewater. High-concentration salt solutions have inhibitory and toxic effects on organisms, and salinize the land, thereby endangering the environment. In addition, in many production processes, due to the continuous accumulation of salt, the recycled process water has a high salt content, which is prone to crystallization or precipitation, which will block the pipeline, increase heat transfer or mass transfer resistance, and affect the stability of the process. [0003] For a long time, my countr...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/66C02F101/16
CPCC02F1/5236C02F1/66C02F2101/163
Inventor 孙波李雪万钧张春雪吴新世王萍黄玉平李霞
Owner 北京能泰高科环保技术有限公司
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