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Method for efficiently preparing nano barium sulfate with uniform particles

A technology of nano-barium sulfate and uniform particles, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science. Simple process, no magnification effect, fine appearance and size effect

Inactive Publication Date: 2018-11-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are difficult to meet the requirements of narrow particle size distribution and uniform dispersion in solvents, and there are problems such as high difficulty in purification and complicated follow-up treatment.

Method used

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  • Method for efficiently preparing nano barium sulfate with uniform particles
  • Method for efficiently preparing nano barium sulfate with uniform particles
  • Method for efficiently preparing nano barium sulfate with uniform particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1. First, weigh the raw BaS ore and add it to deionized water at 80°C, stir it with a magnetic stirrer to accelerate dissolution, and then filter to obtain a BaS solution with a concentration of 1 mol / l. Dilute 98% concentrated sulfuric acid into a dilute sulfuric acid solution with a concentration of 1mol / l;

[0043] Step 2. Pump the dilute sulfuric acid and BaS solutions in step 1 into the microreactor in the hot water bath at 70°C at a flow rate of 50 mL / min, and react in the microreactor for 1 s. The barium sulfate product is collected at the outlet of the device and the NaOH solution that produces toxic gas is absorbed;

[0044] Step 3. The product in step 2 is subjected to high-speed centrifugation, washing, and the speed of the centrifuge is 10000 r / min. Wash 5 times with alcohol until the washing liquid is neutral, stop the centrifugal washing, and remove the centrifuged product and transfer it to an oven. Dry at low temperature for 5 hours, and the oven t...

Embodiment 2

[0047] Step 1. First weigh the raw BaS ore and add it to deionized water at 80°C, stir it with a magnetic stirrer to accelerate the dissolution, and then filter to obtain a BaS solution with a concentration of 1 mol / L. Dilute 98% concentrated sulfuric acid into a dilute sulfuric acid solution with a concentration of 1 mol / L;

[0048] Step 2. Pump the dilute sulfuric acid and BaS solutions in step 1 into the microreactor in the 80°C hot water bath at a flow rate of 100 mL / min, respectively, and react in the microreactor for 0.5 s. The barium sulfate product is collected at the outlet of the device and the NaOH solution that produces toxic gas is absorbed;

[0049] Step 3, the product in step 2 is subjected to high-speed centrifugation, washing, and the centrifuge speed is 12000 r / min, and is washed 8 times with alcohol until the washing liquid is neutral to stop centrifugation and washing, and the centrifuged product is removed and transferred to Dry in an oven at low temperat...

Embodiment 3

[0052] Step 1. First weigh the raw BaS ore and add it to deionized water at 80°C, stir it with a magnetic stirrer to accelerate the dissolution, and then filter to obtain a BaS solution with a concentration of 0.5 mol / L. Dilute 98% concentrated sulfuric acid into a dilute sulfuric acid solution with a concentration of 0.5mol / l;

[0053] Step 2. Pump the dilute sulfuric acid and BaS solutions in step 1 into the microreactor in the hot water bath at 60°C at a flow rate of 50 mL / min, and react in the microreactor for 1 s. The barium sulfate product is collected at the outlet of the device and the toxic gas is absorbed and treated with NaOH solution;

[0054] Step 3. The product in step 2 is subjected to high-speed centrifugation, washing, and the centrifuge speed is 8000 r / min. Wash with deionized water for 6 times until the washing liquid is neutral, stop the centrifugal washing, and remove the centrifuged product. Dry in an oven at a low temperature for 5 hours at a temperatur...

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Abstract

The invention discloses a method for efficiently preparing nano barium sulfate with uniform particles. Soluble BaS raw ore is used as a raw material to prepare the nano barium sulfate by virtue of pretreatment, main reaction and after-treatment. The method specifically comprises the following steps: adding the raw material soluble BaS raw ore into deionized water, dissolving to obtain a 0.1 to 5 mol / L BaS solution, wherein the BaS solution is used as a reaction solution a for standby use; preparing a sulfuric acid solution with the same concentration as the reaction solution a, wherein the sulfuric acid solution is a reaction solution b which is used for the standby use; pumping the reaction solution a and the reaction solution b into a micro reactor to react at a speed of 50 to 150 ml / min, standing for 0.1 to 20 s in the micro reactor, collecting a product c at an outlet of the micro reactor, and recovering H2S gas generated in the main reaction; and centrifuging, washing and drying the product c to obtain a target object nano barium sulfate with uniform particles. The nano barium sulfate product prepared by the method has the characteristics of uniformity in size distribution, good dispersity, narrow distribution of particle size and the like, and the particle size of the product is in a range of 30 to 50 nm.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for efficiently preparing nano barium sulfate with uniform particles. Background technique [0002] As an important chemical product, barium sulfate has been widely used in many fields such as plastics, coatings, ceramics and papermaking, and has shown good application effects and economic value. Its low cost, low hardness and oil absorption value, non-toxic, light color, high brightness, acid and alkali resistance, light resistance and good dispersion and many other superior properties make it an irreplaceable inorganic filler (function) Material. It has been found that barium sulfate with different particle sizes has different uses, which makes the research on the preparation of barium sulfate with controllable particle size very important. Research and preparation of high-quality nano-barium sulfate powder is the first choice for my country to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46B82Y30/00
CPCB82Y30/00C01F11/462C01P2002/72C01P2004/04C01P2004/64
Inventor 郭胜惠张利华禹志宏谢文彬伍廷鑫尹少华罗尧尧王贵诚卫炎勋
Owner KUNMING UNIV OF SCI & TECH
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