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A mercury adsorbent composition, process of making same and method of separating mercury from fluids

A technology of composition and adsorbent, which is applied in the field of mercury adsorbent composition, preparation and separation of mercury from fluid, can solve problems such as inability to remove mercury, and achieve high mercury selectivity, high mercury loading capacity, and fast mercury removal speed effect

Inactive Publication Date: 2007-06-20
ADVANCED MINERALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] None of the known prior art composition products and methods are capable of efficient, effective and economical removal of mercury from fluids at high mercury loading capacity and fast mercury removal rates

Method used

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  • A mercury adsorbent composition, process of making same and method of separating mercury from fluids
  • A mercury adsorbent composition, process of making same and method of separating mercury from fluids
  • A mercury adsorbent composition, process of making same and method of separating mercury from fluids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135]High-efficiency mercury adsorbent products were prepared using natural diatomite products as raw materials. This raw material has a 5μm(d 10 , defined as the size of 10% of the volume smaller than the indicated size) to about 82 μm (d 90 , defined as the particle size distribution (PSD) where 90% of the volume by volume is smaller than the indicated size). To increase the surface silanol groups, 100 g of this material was hydrated by spraying 20 g of DI water in the mixer. In a 500 ml glass flask covered with a watch glass, 12.5 g of the hydrated material was mixed with 12.5 g of Silquest_A-189 gamma-mercaptopropyltrimethoxysilane, 225 ml of chloroform. After mixing on a magnetic stirrer at room temperature for 4 days, the slurry was washed with 62.5 ml of chloroform and filtered through a Buchner funnel with #2 Whatman filter paper. The separated solid was placed in a glass dish and air dried overnight.

Embodiment 2

[0137] Mercury adsorption isotherm experiments were performed to study the mercury loading capacity. by HgCl 2 and DI water to prepare aqueous solutions containing 93, 137, 404, 591, 788 and 980 mg / L ionic mercury. 10 mg of the product of Example 1 were mixed with 50 ml of the mercury-containing solution in a 100 ml glass flask sealed with a packaging film. After mixing for 24 hours at room temperature on a magnetic stirrer, the solution was filtered through a 0.45 micron pore size filter. The filtrate was collected for measurement of mercury concentration using inductively coupled plasma (ICP). Mercury loading capacity was calculated from the difference in mercury concentration before and after adsorption. The highest mercury loading capacity was therefore calculated to be 428 mg Hg / g sorbent at 980 ppm.

[0138] Fitting isotherm data using Langmuir adsorption (Casey, 1997):

[0139] Q e =X m KC e / (1+KC e )

[0140] in:

[0141] Q e is the adsorption density at e...

Embodiment 3

[0150] The mercury removal performance test of the product of Example 1 was carried out. 100 mg of the product of Example 1 was mixed with 100 ml of an aqueous solution containing 9700 ppb ionic mercury prepared from an atomic absorption (AA) standard solution. After mixing for 30 minutes at room temperature on a magnetic stirrer, the solution was filtered through a 0.45 micron pore size filter. The filtrate was collected for measurement of mercury concentration using cold vapor atomic adsorption (CVAA). The final mercury concentration was measured to be 7.4 ppb, ie a mercury removal rate of over 99.9% was obtained within 30 minutes at a load of 1 g / L.

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PUM

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Abstract

A heavy metal adsorbent composition configured for use as a mercury adsorbent composition, agent or product is shown. The mercury adsorbent composition comprises a natural diatomite in the form of siliceous frustules of diatoms having a surface punctuated by a series of openings defining frustule structures having sizes in the range of about 0.75 m to about 1,000 m. The diatoms have the surfaces thereof treated with an activating material capable of removing mercury by chemical bonding forming surface treated diatoms which when brought into contact with a mercury containing fluid react with mercury to cause mercury to separate from the fluid by chemical bonding to the surface treated diatoms.

Description

Background technique [0001] 1. Domain [0002] The present invention relates generally to mercury sorbent compositions for separating mercury from fluids, methods of separating mercury from fluids, and methods of making mercury sorbent compositions, and more particularly to mercury sorbent compositions for use in the separation of mercury from aqueous, oily, and organic solutions. Mercury adsorbent formed of natural diatomaceous earth for separating mercury in water, method for separating mercury from one of aqueous solution, oil and organic solution using surface-treated diatoms, and preparation of natural diatom frustule form including silicon Method for mercury sorbent compositions of diatomaceous earth wherein the surface of the diatoms is treated with an activated material capable of forming surface-treated diatoms and removing mercury by chemical bonding, which reacts with mercury when the surface-treated diatoms are brought into contact with mercury-containing fluids ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/14C02F1/28C10G25/00
CPCC02F1/285C02F1/281C02F2103/18C10G2300/44C10G25/003C02F2101/20C02F1/288C10G2300/205B01J20/14B01J20/3257
Inventor B·王
Owner ADVANCED MINERALS
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