Process for preparing detergent builder zeolite - A from kimberlite tailings

A technology of tailings and zeolite, applied in the direction of detergent compounding agent, detergent composition, chemical instruments and methods, etc.

Inactive Publication Date: 2007-12-19
COUNCIL OF SCI & IND RES +1
10 Cites 4 Cited by

AI-Extracted Technical Summary

Problems solved by technology

The limitation of this method is ...
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Method used

[0128] The X-ray diffraction patterns of the product (Example 10) and SASIL are shown in FIG. 1 . SEM of the product showed a cubic structure with rounded corners and edges, with Zeolite A having an average particle size of les...
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Abstract

The present invention provides a process for the preparation of detergent builder Zeolite-A from Kimberlite tailing generated as solid waste during diamond mining is disclosed. The process comprises, reacting an acid treated Kimberlite tailing with alkali solution to obtain sodium silicate and reacting it with alkaline aluminium source at room temperature and crystallizing at higher temperature to obtain Zeolite-A. The product is useful as builder in detergent formulation.

Application Domain

SilicaDetergent compounding agents +1

Technology Topic

Sodium silicateAluminium +6

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  • Process for preparing detergent builder zeolite - A from kimberlite tailings
  • Process for preparing detergent builder zeolite - A from kimberlite tailings

Examples

  • Experimental program(10)

Example Embodiment

[0108] Example 1
[0109] Under reflux conditions and continuous stirring, 500 g of kimberlite tailings were digested in a round bottom flask with 100 g of NaOH and 1280 g of tap water at boiling temperature for 5 hours. After the digestion is complete, the sodium silicate is isolated by filtration. To prepare the sodium aluminate solution, 7.9 g of NaOH and 6.3 g of aluminum trihydrate were dissolved in 17.4 g of water under continuous stirring and heating. For gel formation, 62 g of sodium silicate (with 2.93% Na 2 O and 7.75% SiO 2 ) into a stainless steel container, and the sodium aluminate solution was added to the container at a controlled rate at ambient temperature with stirring. It was then transferred to a closed reactor and crystallized at 95°C for 2.5 hours. After crystallization, the product slurry was filtered and washed with deionized water until the pH of the filtrate was ~10.5. The wet cake was dried in an oven at 110°C for 6 hours. X-ray diffraction analysis of this product showed a pattern matching that reported for Zeolite-A.

Example Embodiment

[0110] Example 2
[0111] Under reflux conditions and continuous stirring, 500 g of kimberlite tailings were digested in a round bottom flask with 100 g of NaOH and 1280 g of tap water at boiling temperature for 5 hours. After the digestion is complete, the sodium silicate is isolated by filtration. To prepare the sodium aluminate solution, 7.9 g of NaOH and 6.3 g of aluminum trihydrate were dissolved in 17.4 g of water under continuous stirring and heating. For gel formation, 62 g of sodium silicate (with 2.93% Na 2 O and 7.75% SiO 2 ) into a stainless steel container, and the sodium aluminate solution was added to the container at a controlled rate at ambient temperature with stirring. It was then transferred to a closed reactor and crystallized at 95°C for 1.0 hour. After crystallization, the product slurry was filtered and washed with deionized water until the pH of the filtrate was ~10.5. The wet cake was dried in an oven at 110°C for 6 hours. X-ray diffraction analysis revealed that the obtained product was in an amorphous phase, which may be due to insufficient crystallization time.

Example Embodiment

[0112] Example 3
[0113] Under reflux conditions and continuous stirring, 72 g of kimberlite tailings were digested in a round bottom flask with 20 g of NaOH and 200 g of tap water at boiling temperature for 5 hours. After the digestion is complete, the sodium silicate is isolated by filtration. To prepare the sodium aluminate solution, 7.44 g of NaOH and 6.28 g of aluminum trihydrate were dissolved in 54.46 g of water under continuous stirring and heating. For gel formation, 25.20 g of sodium silicate (with 8.62% Na 2 O and 19.05% SiO 2 ) into a stainless steel container, and the sodium aluminate solution was added to this container at a controlled rate at ambient temperature with stirring. After preparation of the gel, 100 mg of Zeolite-A was added as seed crystals. It was then transferred to a closed reactor and crystallized at 95°C for 1.0 hour. After crystallization, the product slurry was filtered and washed with deionized water until the pH of the filtrate was ~10.5. The wet cake was dried in an oven at 110°C for 6 hours. X-ray diffraction analysis revealed that the obtained product was in an amorphous phase, which may be due to insufficient crystallization time. It also concluded that seeding was not beneficial.

PUM

PropertyMeasurementUnit
Average particle size<= 4.0µm

Description & Claims & Application Information

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