Defluorination and dephosphorization method of PSRY molecular sieve production wastewater

A technology for the production of wastewater and molecular sieves, applied in chemical instruments and methods, water pollutants, natural water treatment, etc. and other problems to achieve the effect of reducing operating costs, management difficulties, and sufficient supply

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because PSRY molecular sieve production wastewater contains a large amount of SO 4 2- ion, CaSO 4 The generation of calcium salts, especially CaF 2 The generation efficiency and precipitation performance of PSRY molecular sieves, while the high content of silicon in PSRY molecular sieve production wastewater will seriously affect the recovery and utilization efficiency of adsorbents
Therefore, the above methods are difficult to be effectively applied to the removal of fluoride and phosphorus from PSRY molecular sieve production wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] PSRY molecular sieve production wastewater water sample: F - Content: 1936mg / L; PO 4 3- -P content: 286mg / L; SO 4 2- Content: 21638mg / L; Aluminum content: 4075mg / L; pH: 3.28.

[0040] Solid waste: Moisture content: 80%; Al 2 o 3 Content: 7.2%.

[0041] Take 100g of solid waste residue and add it to 1000mL of PSRY molecular sieve production wastewater, stir and react at room temperature for 60min, and the pH after the reaction is 4.0; then add 35m% sodium hydroxide solution to the wastewater, adjust the pH value to 7.2, and continue to stir for 60min; Afterwards, 1 mg / L PAM was added to the wastewater for coagulation-assisted reaction for 1 min; finally, the water samples were left to stand for 120 min for solid-liquid separation. Take the supernatant to measure F - The content is 18mg / L; PO 4 3- -P content is 0.5mg / L.

Embodiment 2

[0043] PSRY molecular sieve production wastewater water sample: F - Content: 2257mg / L; PO 4 3- -P content: 297mg / L; SO 4 2- Content: 22713mg / L; Aluminum content: 4371mg / L; pH: 3.24.

[0044] Solid waste: moisture content: 85%; Al 2 o 3 Content: 5.2%.

[0045] Take 200g of solid waste residue and add it to 1000mL of PSRY molecular sieve production wastewater, add a small amount of hydrochloric acid at the same time, stir and react for 80min, and the pH after the reaction is 3.8; then add 35m% sodium hydroxide solution to the wastewater, adjust the pH value to 7.8, and continue stirring React for 90 minutes; then add 1 mg / L PAM to the wastewater for coagulation-assisted reaction for 1 minute; then let the water sample stand for 120 minutes for solid-liquid separation; take the supernatant and add 40 mg / L polyaluminum chloride and 1 mg / L PAM The coagulation-assisted reaction was carried out again for 1 min; finally, the water sample was left to stand for 120 min before sol...

Embodiment 3

[0047] PSRY molecular sieve production wastewater water sample: F - Content: 2223mg / L; PO 4 3- -P content: 331mg / L; SO 4 2- Content: 21830mg / L; Aluminum content: 4441mg / L; pH: 2.96.

[0048] Solid waste: moisture content: 75%; Al 2 o 3 Content: 7.8%.

[0049] Take 80g of solid waste residue and add it to 1000mL of PSRY molecular sieve production wastewater, stir and react for 90 minutes, and the pH after the reaction is 3.7; then add 35m% sodium hydroxide solution to the wastewater, adjust the pH to 7.0, and continue to stir and react for 90 minutes; Add 1 mg / L PAM to the wastewater for coagulation-assisted reaction for 1 min; finally, let the water sample stand for 120 min for solid-liquid separation. Get the supernatant and measure the F-content to be 13mg / L; PO 4 3- -P content is 0.3mg / L.

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PUM

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Abstract

The invention relates to a defluorination and dephosphorization method of PSRY molecular sieve production wastewater. The method comprises the following steps: (1) solid waste residues generated during treatment process of PSRY molecular sieve production wastewater and other molecular sieve production wastewater are mixed, and aluminum in the solid waste residues is dissolved in the form of Al<3+> in the wastewater, wherein pH value of the mixed system during the dissolution process is less than 4.5; (2) pH value of the mixed system obtained from the step (1) is adjusted to more than 6 to make Al<3+> reacts with F<-> and PO4<3-> so as to fully precipitate F<-> and PO4<3->; and (3) a coagulant aid is added into the mixed system obtained from the step (2), and solid-liquid separation is carried out on the mixed system which has undergone coagulantion enhancement, wherein dosage and dissolution conditions of the solid waste residues in the step (1) enable Al<3+> in the step (2) to fully precipitate F<-> and PO4<3->. By the method, fluorine and phosphor in the PSRY molecular sieve production wastewater can be effectively removed.

Description

technical field [0001] The invention relates to a method for wastewater treatment, in particular to a method for removing fluorine and phosphorus from wastewater produced by PSRY molecular sieves. Background technique [0002] Phosphorus-containing skeleton silicon-rich ultra-stable Y molecular sieve (PSRY molecular sieve) is a new type of skeleton silicon-rich molecular sieve prepared by NaY molecular sieve through hydrothermal roasting and complex acid dealumination of silicon. It is prepared with PSRY molecular sieve as the main active component Fluid catalytic cracking (FCC) catalyst has the characteristics of good coke selectivity, high gasoline octane number, strong heavy oil cracking ability, and high diesel yield. After successful industrial trial production, FCC with PSRY molecular sieve as the main active component The catalyst has been used in many heavy oil catalytic cracking units across the country, and has achieved good economic and social benefits. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F1/52C02F1/66C02F9/00C02F2101/105C02F2101/12C02F2103/34
Inventor 桑军强马欣高峰崔龙鹏张超
Owner CHINA PETROLEUM & CHEM CORP
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