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Method for molding rare earth absorbent

A molding method and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as easy loss, large hydraulic resistance, and difficult recovery

Inactive Publication Date: 2009-12-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patent with the publication number CN1817439A discloses a new type of adsorbent which is loaded with hydrated oxides of rare earth elements on carriers such as zeolite. , Difficulty in recovery, large hydraulic resistance during use, etc.

Method used

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  • Method for molding rare earth absorbent

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Embodiment 1

[0017] Embodiment 1: cerium nitrate is dissolved in distilled water, is made into the solution that cerium ion is 0.7% by mass fraction, adjusts pH with sodium hydroxide solution to be 10, now has cerium hydroxide to generate in the solution; Particle diameter is 100 ~130 mesh 4A zeolite, soak in 0.1mol / L sodium hydroxide solution for 1 hour, wash repeatedly with distilled water several times after soaking, then soak in 0.1mol / L hydrochloric acid solution for 1 hour, wash repeatedly with distilled water for several times after soaking Finally, soak in distilled water for 1 hour, filter and dry at 120°C for 12 hours; after activation, add it into the prepared cerium hydroxide solution according to the solid-liquid ratio of 1:50, stir at room temperature for more than 16 hours, filter After drying the filter cake for 12 hours, the powdered rare earth adsorbent was prepared; the powdered rare earth adsorbent was initially granulated with polyvinyl alcohol, and pressed after obtain...

Embodiment 2

[0019] Embodiment 2: lanthanum chloride is dissolved in distilled water, is made into the solution that lanthanum ion is 0.8% by mass fraction, adjusts pH with sodium hydroxide solution and is 11, now has lanthanum hydroxide to generate in the solution; Raw material is particle diameter For 4A zeolite of 100-130 mesh, soak in 0.1mol / L sodium hydroxide solution for 1 hour, wash repeatedly with distilled water several times after soaking, then soak in 0.1mol / L hydrochloric acid solution for 1 hour, soak with distilled water repeatedly Wash several times, and finally soak in distilled water for 1 hour, filter and dry at 110°C for 12 hours; after activation, add it to the prepared lanthanum hydroxide solution according to the solid-to-liquid ratio of 1:50, and stir at room temperature for more than 20 hours After filtration, the filter cake was dried for 12 hours to obtain a powder rare earth adsorbent; the powder rare earth adsorbent was initially granulated with polyvinyl alcohol...

Embodiment 3

[0021] Embodiment 3: lanthanum chloride is dissolved in distilled water, is made into the solution that lanthanum ion is 0.75% by mass fraction, adjusts pH to be 10 with sodium hydroxide solution, has lanthanum hydroxide to generate in this moment in solution; Raw material is particle diameter Diatomaceous earth of 60-80 mesh, soaked in 0.1mol / L sodium hydroxide solution for 1 hour, washed repeatedly with distilled water several times after soaking, then soaked in 0.1mol / L hydrochloric acid solution for 1 hour, soaked in distilled water Repeated washing several times, finally soaked in distilled water for 1 hour, filtered and dried at 110°C for 12 hours; after activation, added to the prepared lanthanum hydroxide solution according to the solid-to-liquid ratio of 1:50, and stirred at room temperature for 18 hours Above, after filtration, the filter cake was dried for 12 hours to obtain a powder rare earth adsorbent; the powder rare earth adsorbent was initially granulated with ...

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Abstract

The invention relates to a method for molding rare earth absorbent, which comprises the following steps: firstly, activating, soaking, drying and screening one of zeolite, diatomite and activated aluminum oxide sequentially to obtain rare earth absorbent powder; and then, molding the rare earth absorbent by the compression molding method. The molded absorbent is applicable in various treatments of wastewater, particularly the treatment of nitrogen and phosphorous pollution in wastewater; and the molded absorbent can be easily recovered, and the hydraulic resistance is low when in use, thereby preventing the absorbent from running off.

Description

technical field [0001] The invention relates to a method for forming a rare earth adsorbent, which belongs to waste water purification treatment technology. Background technique [0002] The sharp contradiction between water quality eutrophication and water environmental pollution, as well as the enhancement of public awareness of environmental protection, have forced more and more countries and regions to formulate strict wastewater discharge standards, and the indicators and contents have been continuously improved and become more and more stringent. This means that in the future, most urban sewage and industrial wastewater treatment facilities will not only need to consider reducing organic pollutants and suspended solids, but also need to consider deep nitrogen and phosphorus removal. Thereby accelerating the development of sewage nitrogen and phosphorus removal technology. In the past 20 years, the nitrogen and phosphorus removal technology of sewage has been a hot spo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/20C02F1/28
Inventor 宁平黄小凤朱文杰刘伟文陈丽琼谭娟
Owner KUNMING UNIV OF SCI & TECH
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