Porous particulate material for fluid treatment, cementitious composition and method of manufacture thereof

A technology of porous particles and granular materials, applied in the field of terracotta cementitious compositions and similar, porous granular materials of fluids, and cementitious compositions, which can solve the problems of undisclosed cement, sodium reduction, etc.

Inactive Publication Date: 2007-03-07
MT ASPIRING GEOCHEMISTRY CONSULTANTS PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document does not disclose the use of cement as a pozzolanic material in a composition together with red mud, or the use of red mud as a building material, or the use of reduced sodium, neutralized red mud

Method used

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  • Porous particulate material for fluid treatment, cementitious composition and method of manufacture thereof
  • Porous particulate material for fluid treatment, cementitious composition and method of manufacture thereof
  • Porous particulate material for fluid treatment, cementitious composition and method of manufacture thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0257] Example 1: Scanning Electron Microscopy Study of the Pores in the Resulting Agglomerates

[0258] Two pellets were made using the following methods.

[0259] Pellet 1 was made by mixing the following components to form a slurry:

[0260] 80g processed red mud

[0261] 4g slaked lime

[0262] 4g magnesium oxide

[0263] 2g HPMC plasticizer / polymerizer,

[0264] 15g Portland cement;

[0265] 8g dry component quartz sand

[0266] 70mL water,

[0267] 8mL 3% HO 2 o 2 ,and

[0268] 0.22mL 1.5M HO 3 PO 4

[0269] The above components were mixed in a shear mixer for 1 minute. The wet slurry was poured into molds with a height-to-diameter aspect ratio of 3.5:1, capped tightly, and cured for 28 days.

[0270] Pellet 2 was made by mixing the following components to form a slurry:

[0271] 70g processed red mud

[0272] 2g HPMC plasticizer,

[0273] 15g Portland cement,

[0274] 13g quartz sand

[0275] 70mL water,

[0276] 0.8mL 3% HO 2 o 2 ,and

[0277] 0....

Embodiment 2

[0281] Example 2: Treatment of metal-rich tanning wastewater using a column composed of porous pellets

[0282] Referring to FIG. 7, a schematic diagram of the laboratory setup used to obtain the results of Example 2 is shown. This test used the pellet 1 given in Example 1 above, which was slightly crushed and sieved to obtain material in 4 particle size ranges: 250 μm to 500 μm, 500 μm to 750 μm, 750 μm to 1000 μm, and 1000 μm to 2000 μm. A pellet mixture of 4 particle sizes of 25% each was made to provide the filtration / reaction column (10). Three filtration / reaction columns (10, 20, 30) were constructed using polycarbonate tubing with an internal diameter of 44 mm. One end of each column (10, 20, 30) was closed and filled with a 10 cm long section of coarse sand and gravel mixture (12), geotextile wadding, treated red mud pellets as a prefilter (14), another geotextile wadding (16), another 10 cm long coarse sand and gravel to hold the treated red mud pellets (14) in plac...

Embodiment 3

[0285] Example 3: Instructions for Batch Production of Porous Agglomerates in a 4 Cubic Meter Cement Mixer

[0286] Element

[0287] 2000kg A1 treated red mud, sieved to <2mm

[0288] 400kg ordinary Portland cement;

[0289] 250kg finely ground quartz sand;

[0290] 100kg slaked lime, sieved to <1mm;

[0291] 200kg magnesium oxide, sieved to <1mm;

[0292] 50kg hydroxypropyl-methyl-cellulose (HPMC) plasticizer;

[0293] About 2000L water;

[0294] 25L 3% hydrogen peroxide (H 2 o 2 );

[0295] 7L 1.5M orthophosphoric acid (H 3 PO 4 );

[0296] Total dry product weight: 3,000kg

[0297] Gross wet product weight: approx. 2,032kg

[0298] Total wet weight: approx. 5,032 kg (2m 3 )

[0299] It will be appreciated that the dry treated red mud described above may optionally be used. Treated red mud with a moisture content of about 50% can additionally be used, but the amount of water added needs to be reduced in proportion to the water content in the treated red mud. ...

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Abstract

A porous particulate material for treating a fluid containing a contaminant is disclosed. The particulate material comprises a cementitious matrix or binder and treated bauxite refinery residue or red mud. At least a portion of the pores in the particulate material is open cell or interconnected pores. The invention also relates to the use of a reactive permeable barrier comprising porous material, for treating a contaminated fluid. Also disclosed is a method for producing porous particulate material for treating a contaminated fluid and a method for treating a contaminated fluid, in which the porous material is used. The invention furthermore relates to a cementitious composition comprising partially neutralised red mud and cement, wherein the partially neutralised red mud has been pre-treated by contacting it with water having a total hardness supplied by calcium, magnesium or a combination thereof, of at least 3.5 millimoles per litre calcium carbonate equivalent. The cementitious composition is useful as a building and construction material.

Description

technical field [0001] The present invention relates to the treatment of one or more contaminants in a fluid. More particularly, the present invention relates to porous particulate materials for use in treating fluids containing contaminants and methods of making such particulate materials. [0002] The invention also relates to cementitious compositions. More specifically, the present invention relates to cementitious compositions that can be manufactured and applied using conventional casting, pumping, grouting and spraying methods, which can be used in a variety of applications, for example, acid-resistant cementitious compositions, sulfate-resistant cementitious cementitious compositions, salt water resistant cementitious compositions, fine grained surface textured cementitious compositions, aerated or blown cementitious compositions, terracotta cementitious compositions and the like. The invention also relates to methods for the manufacture of such compositions. Backg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/14C02F1/42
CPCY02W10/37Y02W30/91
Inventor M·W·克拉克F·G·戴维斯-麦科恩齐D·麦科恩齐L·芒罗D·福克斯
Owner MT ASPIRING GEOCHEMISTRY CONSULTANTS PTY LTD
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