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Method for recycling and preparing high-purity aluminum hydroxide from petroleum resin process wastewater

A technology for aluminum hydroxide and wastewater, which is applied in the fields of alumina/aluminum hydroxide, chemical instruments and methods, chemical recovery, etc., can solve the problem of poor applicability of aluminum-containing and acid-containing wastewater, reduced process practicability, fluorine and calcium and other issues, to achieve the effect of low overall treatment cost, strong ability to remove environmentally harmful impurities, and reduce organic matter content

Active Publication Date: 2020-11-13
HENGHE MATERIALS & SCI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for recovering and preparing high-purity aluminum hydroxide from petroleum resin process wastewater, which overcomes the problems in the treatment process in the prior art, or focuses on the recovery of aluminum-containing compounds, or focuses on the clean treatment of wastewater, And the applicability to complex aluminum-containing acid-containing wastewater is not strong, which reduces the defect of process practicability. In the present invention, two-stage neutralization→flocculation→precipitation process is adopted to obtain calcium fluoride and high-purity aluminum hydroxide respectively, so as to solve the problem of waste water at the same time. The problem of fluoride and calcium

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  • Method for recycling and preparing high-purity aluminum hydroxide from petroleum resin process wastewater
  • Method for recycling and preparing high-purity aluminum hydroxide from petroleum resin process wastewater
  • Method for recycling and preparing high-purity aluminum hydroxide from petroleum resin process wastewater

Examples

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Embodiment 1

[0045] A stream of acidic wastewater from the catalyst removal process after catalytic polymerization of petroleum resins has a COD of 10500 mg / L and a pH of 2.2. The water quality is as follows:

[0046]

[0047]

[0048] In the acid water conditioning tank, the waste water enters the neutralization flocculation tank A after skimming off the scum, adding 0.10% of hydrogenated white oil, 0.03% of PAM, and 15.0% of anhydrous calcium chloride respectively in the total mass of the waste water, and fully stirring Finally, it is sent to the sedimentation tank A; the mud scraper sends the calcium-containing mud to the calcium salt tank, and the upper liquid is transported to the neutralization flocculation tank B. Then add excessive purity respectively and be 15% sodium hydroxide aqueous solution (a part is used for neutralizing the H in water, a part of reaction produces aluminum hydroxide precipitation), 0.02% PAM and 0.02% PAC, make the waste water pH in the pond be 8.5, Af...

Embodiment 2

[0050] Using the acidic wastewater in Example 1 as raw material, in the acidic water regulating tank, the wastewater enters the neutralization flocculation tank A after skimming off the scum, and respectively adds 0.15% of the total mass of the wastewater to hydrogenated white oil, 0.05% of PAM, and 12.0% anhydrous calcium chloride, fully stirred and sent to the sedimentation tank A; the mud scraper sends the calcium-containing mud to the calcium salt tank, and the upper liquid is transported to the neutralization flocculation tank B. Then add excessive purity of 15% sodium hydroxide aqueous solution, 0.05% PAM and 0.05% PAC respectively, so that the pH of the wastewater in the pool is 8.56, and after fully stirring, it is sent to the sedimentation tank B, and the aluminum-containing mud is sent to the sedimentation tank B through the scraper. Enter the foam ceramic adsorption tower (foam ceramic pore density 8-60ppi, porosity 80-90%, volume density 0.50g / cm 3 , compressive st...

Embodiment 3

[0052] A stream of acidic wastewater from the catalyst removal process after catalytic polymerization of petroleum resins has a COD of 14360 mg / L and a pH of 1.3. The water quality is as follows:

[0053]

[0054]

[0055] In the acid water adjustment tank, the waste water enters the neutralization flocculation tank A after skimming off the scum. Hydrogen white oil, 0.08% PAM, and 0.4% anhydrous calcium chloride are fully stirred and sent to sedimentation tank A; mud scrapers send calcium-containing mud to calcium salt tank, and the upper liquid is sent to neutralization flocculation tank B. Then add excessive purity of 15% sodium hydroxide aqueous solution, 0.08% PAM and 0.08% PAC respectively, and send them into sedimentation tank B after fully stirring, so that the pH of wastewater in the pool is 8.90, and the aluminum-containing mud is sent to Enter the foam ceramic adsorption tower (foam ceramic pore density 8-60ppi, porosity 80-90%, volume density 0.50g / cm 3 , com...

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Abstract

The invention relates to a method for recycling and preparing high-purity aluminum hydroxide from petroleum resin process wastewater. The method comprises the following steps: carrying out pH value regulation on acidic aluminum-containing wastewater, removing scum, adding hydrogenated white oil, polyacrylamide and anhydrous calcium chloride, removing calcium-containing slurry; then adding a sodiumhydroxide aqueous solution, polyacrylamide and polymeric aluminum chloride, separating out aluminum-containing slurry, and dehydrating and drying the aluminum-containing slurry through a diaphragm filter press to recover high-purity aluminum hydroxide, which can be applied to production of a water purifying agent. The method is simple and convenient in process, high in adaptability to aluminum-containing acidic wastewater and suitable for environment-friendly treatment of petroleum resin process waste liquid.

Description

technical field [0001] The invention belongs to the field of wastewater treatment methods, in particular to a method for recovering and preparing high-purity aluminum hydroxide from petroleum resin process wastewater. Background technique [0002] The Friedel-Crafts reaction (Friedel-Crafts reaction) catalyst commonly used in the catalytic polymerization process of petroleum resin has boron trifluoride (BF 3 ), boron trifluoride ether (BF 3 ·Et 2 O), anhydrous aluminum trichloride, etc. After the polymerization reaction is completed, the post-treatment process most often uses sodium hydroxide, calcium hydroxide, etc. as the catalyst for water washing, so a large amount of Al-containing 3+ , Ca 2+ , Cl — , F — Plasma of oily alkaline process wastewater. Due to the characteristics of large fluctuations in composition, high COD, easy emulsification, and strong corrosion, the process wastewater has become a difficult problem in the post-treatment of petroleum resin. At t...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01F7/02C01F11/22C02F101/10C02F101/14C02F103/38
CPCC01F7/021C01F7/02C01F11/22C02F9/00C01P2006/80C02F1/56C02F1/5236C02F1/24C02F2101/14C02F2101/10C02F2103/38Y02P20/584
Inventor 王斌孙向东
Owner HENGHE MATERIALS & SCI TECH CO LTD
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