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A control method for efficiently separating vanadium-chromium wastewater by using modified chelating resin

A technology of chelating resin and control method, which is applied in water treatment parameter control, chemical instruments and methods, water pollutants, etc. It can solve the problems of inability to separate vanadium and chromium, co-precipitation of vanadium and chromium in wastewater, etc., and achieve the effect of vanadium separation High efficiency and improved adsorption effect

Active Publication Date: 2022-04-15
JIANGSU NJU ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent realizes the separation of vanadium and chromium in the wastewater in the desorption liquid, but if the valence state of the vanadium and chromium in the wastewater is in a mixed state, and the pH in the wastewater increases with the addition of alkaline substances, it will cause the vanadium and chromium in the wastewater to be separated. The co-precipitation of chromium cannot achieve the purpose of separation of vanadium and chromium

Method used

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  • A control method for efficiently separating vanadium-chromium wastewater by using modified chelating resin
  • A control method for efficiently separating vanadium-chromium wastewater by using modified chelating resin
  • A control method for efficiently separating vanadium-chromium wastewater by using modified chelating resin

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Embodiment 1

[0045] The process flow diagram of the control method for the efficient separation of vanadium-chromium waste water using modified chelating resin of the present embodiment is as follows: figure 1 shown, including the following steps:

[0046] Step 1) Vanadium-chromium waste water enters the reduction pretreatment device, adds sodium thiosulfate for reduction, the dosage of the sodium thiosulfate is 1% (mass volume ratio), and stirs for 30min to remove the high-valent vanadium and chromium in the waste water. Fully restored to a low price state;

[0047] The existing valence state of vanadium and chromium elements in raw water is relatively complex, and exists in a mixed form of high valence state and low valence state. The reduction is mainly to reduce chromium elements to the form of low valence state. 6+ easily reduced to Cr 3+ . In the reduction reaction, the following reactions mainly occur:

[0048] Cr 2 O 7 2- →Cr 3+ (reverted from +6 to +3);

[0049] CrO 4 2...

Embodiment 2

[0073] The control method for efficiently separating vanadium-chromium waste water by using modified chelating resin of the present embodiment comprises the following steps:

[0074] Step 1) Vanadium-chromium wastewater enters the reduction pretreatment device, is added with sodium bisulfite for reduction, the dosage of the reducing agent is 5% (mass volume ratio), and stirred for 120min to fully reduce the vanadium and chromium elements in the wastewater to a low-priced state ;

[0075] Step 2) take the reduced effluent of step 1), and adjust the pH value of the waste water to 4 with sodium hydroxide;

[0076] Step 3) take the effluent after the alkali adjustment in step 2) and add hydrogen peroxide for oxidation, and the oxidation-reduction potential of the waste water after oxidation is controlled at 600mv;

[0077] Step 4) Modification of the guanidine chelating resin, using 20% ​​sulfuric acid acidity, the sulfuric acid pickling flow rate is controlled to 1BV / h, the pick...

Embodiment 3

[0087] The control method for efficiently separating vanadium-chromium waste water by using modified chelating resin of the present embodiment comprises the following steps:

[0088] Step 1) Vanadium-chromium wastewater directly enters the reduction pretreatment device, adds sodium metabisulfite for reduction, the dosage of the reducing agent is 2% (mass volume ratio), and stirs for 60min to fully reduce the vanadium-chromium in the wastewater to a low-priced state;

[0089] Step 2) take the reduced effluent of step 1), and adjust the pH of the waste water to 3.5 with sodium hydroxide;

[0090] Step 3) take the effluent after the alkali adjustment in step 2) by ozone oxidation, and control the oxidation-reduction potential of the oxidized wastewater at 500mv by controlling the oxidation reaction time;

[0091] Step 4) pickling the pyridine-type chelating resin with 10% hydrochloric acid, the hydrochloric acid pickling flow rate is controlled to be 2BV / h, the pickling time is 3...

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Abstract

The invention discloses a control method for efficiently separating vanadium-chromium wastewater by using a modified chelating resin, belonging to the field of wastewater treatment. The method comprises the following steps: step 1) adding a reducing agent to the vanadium-chromium wastewater for reduction treatment, controlling the pH value of the effluent to be 3-5; step 2) performing oxidation treatment on the wastewater, and controlling the oxidative reduction potential of the effluent to be 400-600mv; Step 3) take the chelating resin and carry out pickling, washing and modifying treatment; Step 4) adopt the chelating resin after the modified treatment to adsorb the effluent after step 2) to complete the separation of vanadium and chromium elements; Step 5) to absorb The treated chelating resin is eluted. The method of the present invention not only has high pertinence, but only adsorbs vanadium in waste water, and the adsorption rate of vanadium reaches 99.9%, and chromium remains in the adsorbed water; therefore, efficient separation of vanadium and chromium can be completed during the adsorption process without Carry out desorption separately.

Description

technical field [0001] The invention belongs to the field of waste water resource utilization, and relates to a control method for efficiently separating vanadium and chromium waste water by using a modified chelating resin. Background technique [0002] Vanadium-chromium wastewater is a kind of strong acid and high-salt wastewater. The pH of the wastewater is about 2, and the salt is mainly sodium sulfate and ammonium sulfate. The content of ammonium sulfate is about 2.8%, and the content of sodium sulfate is about 14%. The content is less, less than 100mg / L, and the heavy metal elements are mainly vanadium and chromium, of which the content of vanadium is between 660 and 680mg / L, and the content of chromium is about 1900 to 2500mg / L, both of which are relatively high. [0003] In the existing treatment process, the process of reduction + neutralization + evaporative crystallization is mainly used to treat wastewater. In this treatment process, the reduction is mainly to r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F9/08C02F9/10C22B7/00C22B34/22C01C1/24C01D5/00C02F101/20C02F101/22
CPCC02F9/00C22B7/00C22B34/22C01C1/24C01D5/00C02F1/70C02F1/722C02F1/78C02F1/32C02F1/288C02F2209/06C02F2209/04C02F2101/20C02F2101/22C02F2303/16C02F1/62C02F1/04C02F1/20Y02P10/20
Inventor 高亚娟汪林邵燕朱兆坚唐凯黄如全赵昕李丽芳张炜铭
Owner JIANGSU NJU ENVIRONMENTAL TECH
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