Barium sulfate product

A barium sulfate and barium sulfate-containing technology, applied in the directions of calcium/strontium/barium sulfate, calcium/strontium/barium compounds, fibrous fillers, etc., can solve the problem that products are not always satisfactory

Inactive Publication Date: 2008-12-24
MALLINCKRODT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] While Stone's teachings are useful and overcome some of the problems associated with the preparation of medical barium sulfate by precipitation methods, the resulting products are still not always satisfactory

Method used

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  • Barium sulfate product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Elemental Analysis of Raw Barite Ore, Barium Sulfate Product and "Gray Float"

[0044] The raw barite ore is processed conventionally (eg, without fluidizer treatment) to obtain the barium sulfate product. During processing, collect samples of wash liquor and spent liquor. In order to determine the elemental composition and the relative content of each element in the raw barite ore, barium sulfate product, wash liquor, waste liquor, and "grey floats", samples from each were subjected to a qualitative direct current arc emission technique ( DC arcemission technique) for spectral analysis.

[0045] The results of spectral analysis are shown in Table I. In Table I, the measured content of each element is qualitatively defined using the abbreviations defined in Table II below.

[0046] In Table I, samples denoted "Wash Water" were derived from wash liquor samples collected from the above-mentioned production process. The collected sample was deposited and form...

Embodiment 2

[0063]Example 2 Fluidized Treatment of Barium Sulfate Product to Remove "Gray Floating Matter" Impurities

[0064] The barium sulphate product (11 g) obtained from barite ore processed by conventional methods (eg without fluidizer treatment) was mixed with water (500 ml) and sodium citrate (3 g) in a beaker. The solution was stirred with a mechanical stirrer and a layer of "gray floater" formed above the suspension. The suspension was passed through a 120 mesh (125 μm) screen, which readily separated the "gray floater" material. The filtrate, which contained suspended barium sulfate particles, was substantially clean and free of "gray floater" matter.

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Abstract

This invention generally relates to a barium sulfate product particularly useful as an X-ray contrast agent in preparations administered for examination of the gastrointestinal tract and to processes for making the product from naturally occurring barite ore containing barium sulfate crystals and gangue materials. The process includes treating or contacting the barium sulfate-containing particles obtained from barite ore with a fluidizing agent in a liquid medium to remove gangue materials present therein.

Description

field of invention [0001] The present invention relates generally to a barium sulfate product and a process for preparing the product from a barite ore containing barium sulfate crystals and gangue material. The barium sulfate product can be used in the preparation of paints, rubber, and drilling fluids for oil and gas exploration, and is suitable for medical grade and can be used in a variety of other applications, including as an ingredient in pharmaceutical, veterinary and cosmetic compositions, especially where " Whiter" appearance of barium sulfate products in place. Background of the invention [0002] Barium sulfate is a radiopaque medium widely used as an X-ray contrast agent in medical examinations of the gastrointestinal tract. Typically, for gastrointestinal examinations, the subject being examined drinks a suspension of barium sulfate in water alone or with a carbon dioxide-generating agent such as BAROS effervescent granules (Mallinckrodt, Saint Louis, MO). Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C09C1/02
CPCC01F11/462C09C1/027
Inventor 迈克尔·W·麦基
Owner MALLINCKRODT INC
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