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Method for preparing nano barium sulfate with controllable particle size distribution

A nano-barium sulfate and particle size distribution technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of small overall structure of the reactor and difficulty in large-scale industrial application, so as to prevent further growth of crystal nuclei and crystal grains The effect of small diameter and narrow distribution

Inactive Publication Date: 2009-05-06
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microreactor method is difficult to carry out large-scale industrial application because the overall structure of the reactor is too small

Method used

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  • Method for preparing nano barium sulfate with controllable particle size distribution
  • Method for preparing nano barium sulfate with controllable particle size distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step A: Weigh 317g BaCl 2 2H 2 O and 218g of Na 2 SO 4 , Dissolved in deionized water, respectively made into a solution with a concentration of 1.3M and a volume of 1L.

[0031] Step B: Adjust the gap width of the fully back-mixed liquid membrane reactor to 0.3 mm, and the rotational speed to 1000 rpm, and simultaneously feed the two solutions into the fully back-mixed liquid film reactor at a feeding rate of 210 ml / min to perform a nucleation reaction.

[0032] Step C: Collect the suspension slurry from the reactor outlet and centrifuge wash with deionized water until the aqueous phase is free of Cl - exist. The resulting filter cake was dried in an oven at 70°C for 12 hours to obtain nano BaSO 4 .

[0033] Prepared BaSO 4 After TEM characterization, see figure 2 a, The measured average particle size is 120nm.

Embodiment 2

[0035] Step A: take 8.5g of Ba(NO 3 ) 2 , dissolved in deionized water to form a solution with a concentration of 0.0425M and a volume of 1L, measure 4.25g of concentrated sulfuric acid with a concentration of 98%, dissolve it in deionized water, and prepare a solution with a concentration of 0.0425M and a volume of 1L.

[0036] Step B: Adjust the gap width of the fully back-mixed liquid membrane reactor to 0.3 mm, and the rotational speed to 1000 rpm, and simultaneously add the two solutions into the fully back-mixed liquid film reactor at a speed of 210 ml / min to perform a nucleation reaction.

[0037] Step C: Collect the suspended slurry from the outlet of the reactor and centrifugally wash it with deionized water until pH=7. The resulting filter cake was dried in an oven at 60°C for 14 hours to obtain nano BaSO 4 .

[0038] Prepared BaSO 4 After TEM characterization, the measured average particle size is 80nm.

Embodiment 3

[0040] In Example 1, other preparation conditions were kept unchanged, and in step B, the rotational speed of the reactor was adjusted to 2000 rpm, and the feeding speed of the peristaltic pump was increased to 250 ml / min. The resulting BaSO 4 After TEM characterization, see figure 2 b, the measured average particle diameter is 61 nm.

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Abstract

The invention provides a preparation method of nano barium sulfate with the controllable particle size distribution. The preparation method takes BaCl2 and Na2SO4 as raw materials, respectively prepares two types of solution and then simultaneously adds the two types of solution into a rotary liquid membrane reactor with the high-speed rotation at the same flow rate for carrying out nucleation reaction, and centrifugal washing and drying are carried out to the obtained slurry to obtain the nano BaSO4 with the particle size of 30-120nm and the narrower particle size distribution. The purpose of precisely controlling the particle size of the product can be achieved by regulating and controlling the rotational speed, the gap and other operation parameters of the reactor, thereby being capable of preparing the BaSO4 with the particle size of 30-40nm. The method combines the advantages of a micro-reactor and a high gravity reactor and simultaneously avoids the shortcomings of the micro-emulsion method, the complex method and the like, thereby having small reaction space and high preparation speed and being capable of meeting the requirements on the industrial preparation of the nano BaSO4.

Description

Technical field: [0001] The invention relates to the field of preparation of inorganic non-metallic functional materials, in particular to a nano BaSO with controllable particle size distribution 4 method of preparation. technical background: [0002] BaSO 4 It is an amorphous white powder, which belongs to the orthorhombic crystal system. It is a kind of inorganic salt with very stable chemical properties. It hardly reacts with any substance. It has high whiteness and can absorb harmful rays. The specific gravity is that of all inorganic salts. The substance with the largest specific gravity. Due to its excellent physical and chemical properties, it is widely used in petroleum drilling, plastics, rubber, coatings, medium and high-end inks, pharmaceutical synthesis, chemicals, pigments, papermaking, ceramics, cosmetics and other industries. Currently, BaSO 4 The current development trend is to increase the added value of products such as surface modification and particle...

Claims

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Application Information

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IPC IPC(8): C01F11/46
Inventor 李殿卿郭盛昌林彦军徐向宇段雪
Owner BEIJING UNIV OF CHEM TECH
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