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Production process for nanometer barium sulfate

A nano-barium sulfate and production method technology, applied in the direction of nanotechnology, calcium/strontium/barium sulfate, etc., can solve the problems of large reagent consumption, large saline wastewater, high production cost, etc., and achieve convenient operation and simple production process , Good product quality

Inactive Publication Date: 2013-06-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method consumes a lot of reagents, the production cost is high, and a large amount of saline wastewater is produced.

Method used

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  • Production process for nanometer barium sulfate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1000mL concentration is H 2 SO 410wt% sulfuric acid solution, add 10g sodium nitrate and 5g sodium chlorate as catalyst, add 100g sodium sulfate and 50g potassium sulfate as buffer, stir and add 200g barium carbonate, 25 ℃ of catalytic conversion 8 hours, filter to get barium sulfate filter cake and After transformation, the barium sulfate filter cake was added with water at a solid-liquid ratio of 1: 3g / ml, stirred and washed at 30°C for 2 hours and filtered, then rinsed with absolute ethanol with 1 times the volume of the filter cake, and dried at 95°C for 3 hours to obtain a purity of 98.8% barium sulfate products with a particle size of 30-60nm.

Embodiment 2

[0036] Add 50ml vitriol oil (98%) in the liquid after transformation that embodiment 1 obtains and make reactant, add 6g sodium chloride and make catalyzer, stir and add 190g barium carbonate, 45 ℃ of catalytic transformations 6 hours, filter to get barium sulfate filter cake and Transformation liquid, barium sulfate filter cake after drying, then according to the solid-liquid ratio 1: 3g / ml add water 60 ℃ stirring and washing for 1 hour and filter, filter cake is added water and adjusted to a slurry with a solid content of 50%, spray drying at 180 ℃ to obtain a purity of 99.6% barium sulfate product with a particle size of 40-85nm.

Embodiment 3

[0038] Add 120ml vitriol oil (98%) in the liquid after transformation that embodiment 2 obtains and make reactant, add 1g sodium chlorate and 5g sodium nitrate and make catalyst, 20g ammonium sulfate make buffering agent, stir and add 400g barium carbonate, 65 ℃ of catalysis After transformation for 4 hours, filter the barium sulfate filter cake and the liquid after transformation. Add water to the barium sulfate filter cake at a solid-to-liquid ratio of 1:5g / ml, stir and wash at 85°C for 0.5 hours and filter, then rinse with absolute ethanol that is 1.5 times the volume of the filter cake Finally, dry at 105° C. for 2 hours to obtain a barium sulfate product with a purity of 99.1% and a particle size of 45-90 nm.

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Abstract

The invention discloses a production process for nanometer barium sulfate. The process comprises three main steps, i.e., catalytic conversion, rinsing and drying. According to the invention, a catalyst and a buffering agent are added into a sulfuric acid solution, barium carbonate is added with stirring for catalytic conversion, filtration is carried out to obtain a barium sulfate filter cake andconverted liquid, the converted liquid is returned to a catalytic conversion step for cyclic utilization, and the filter cake is rinsed and dried so as to obtain the product of nanometer barium sulfate. The invention has the following advantages: the production process is simple; the product has a good quality; no waste water and waste residues are produced in the process; environment friendliness is obtained; etc.

Description

technical field [0001] The invention relates to a production method of nanometer barium sulfate. Background technique [0002] Barium sulfate is an important chemical raw material. It is widely used in paints, pigments, coatings, inks, batteries, paper, plastics, rubber, ceramics, enamel, spices and other industries. In addition to the use of ordinary barium sulfate, nano barium sulfate can also have other special uses. For example, nano-barium sulfate is used as a filler for high-grade copy paper, resin, and rubber, and as a developer for X-ray dual contrast technology. The existing production techniques of nano-barium sulfate include crushing and screening method, impinging flow-rotating packed bed method and complexation-precipitation method. The crushing and screening method is to crush and sieve ordinary barium sulfate. The obtained nano-barium sulfate not only has a wide particle size distribution, but also has a rough surface of barium sulfate ions, which cannot be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46B82Y40/00
Inventor 王学文王明玉
Owner CENT SOUTH UNIV
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