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Preparation method of nano-barium sulfate

A technology of nano barium sulfate and barium sulfate, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., to achieve the effect of small particle size, high dispersion, and less non-barium sulfate impurities

Inactive Publication Date: 2015-04-15
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of preparation method of nano barium sulfate, mainly solve the technical problem that surfactant and complexing agent must be used in the preparation process of nano barium sulfate in the prior art

Method used

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  • Preparation method of nano-barium sulfate

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Effect test

Embodiment 1

[0023] A, adopt the accompanying drawing of technological process of the present invention, prepare 2mol / L ammonium sulfate and 4mol / L ammonium nitrate of same volume mix, adjust the pH of mixed solution by dripping ammoniacal liquor to be 10;

[0024] b. Heat the mixed solution to 60°C, mix well under stirring at 200rpm, add 0.8mol / L barium chloride solution dropwise to the mixed solution until the molar number of added barium chloride is the same as that of ammonium sulfate, and the dropwise reaction time For 20min, the solution was turned into a white barium sulfate emulsion;

[0025] c. Use a centrifuge to separate the barium sulfate emulsion generated. The speed of the centrifuge is 1000rpm, and the separation time is 2min. The upper layer solution is discarded and water is added to the original volume, and the bottom layer is mixed with water. Centrifuge the barium sulfate emulsion, take a small amount of the upper layer solution and mix it with silver nitrate (1%), cont...

Embodiment 2

[0028] A, adopt accompanying drawing of technological process of the present invention, prepare 3mol / L ammonium sulfate and 5mol / L ammonium nitrate of same volume mix, adjust the pH of mixed solution by dripping ammoniacal liquor to be 8;

[0029] b. Heat the mixed solution to 80°C, mix evenly under stirring at 1000rpm, add 0.1mol / L barium chloride solution dropwise to the mixed solution until the molar number of added barium chloride is the same as that of ammonium sulfate, and the dropwise reaction time For 40min, the solution was turned into a white barium sulfate emulsion;

[0030] c. Use a centrifuge to separate the barium sulfate emulsion generated. The centrifuge speed is 5000rpm, and the separation time is 4min. The upper layer solution is discarded and water is added to the original volume, and the bottom layer is mixed with water. Centrifuge the barium sulfate emulsion, take a small amount of the upper layer solution and mix it with silver nitrate (1%), continue to a...

Embodiment 3

[0033] a, adopt the accompanying drawing of technological process of the present invention, prepare 2mol / L ammonium sulfate and 4mol / L ammonium nitrate of same volume mix, adjust the pH of mixed solution by dripping ammoniacal liquor to be 8;

[0034] b. Heat the mixed solution to 70°C, mix well under stirring at 600rpm, add 0.4mol / L barium chloride solution dropwise to the mixed solution until the molar number of added barium chloride is the same as that of ammonium sulfate, and the dropwise reaction time For 30min, the solution was turned into a white barium sulfate emulsion;

[0035] c. Use a centrifuge to separate the barium sulfate emulsion generated. The centrifuge speed is 2000rpm, and the separation time is 2min. The upper solution is discarded and water is added to the original volume. The bottom layer is mixed with water. Centrifuge the barium sulfate emulsion, take a small amount of the upper layer solution and mix it with silver nitrate (1%), continue to add water ...

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Abstract

The invention relates to a preparation method of nano-barium sulfate and belongs to the field of preparation of inorganic nonmetal function materials. The invention aims to mainly solve the technical problem that a surfactant and a coordination agent must be used during the present preparation process of nano-barium sulfate. The technical scheme is as follows: the preparation method of nano-barium sulfate comprises the following steps: a, preparing an ammonium sulfate-ammonium nitrate mixed solution and dropwise adding ammonia to adjust pH of the mixed solution to 8-10; b, heating the mixed solution to 60-80 DEG C, uniformly mixing under agitation condition at 200-1000 rpm, and adding a barium chloride solution into the mixed solution; c, separating a barium sulfate emulsion generated in the step b by the use of a centrifuge; and d, drying the separated barium sulfate, grinding the dried barium sulfate to a powder, and storing the powder so as to obtain a nano-barium sulfate finished product. When the product prepared by the above method is used for lead-removing of a tin plating solution for production of an electrolytic tinplate, lead content of the plate's tin coating can be stably controlled below 100 ppm.

Description

technical field [0001] The invention relates to the field of preparation of inorganic non-metallic functional materials, in particular to a preparation method of nanometer barium sulfate. [0002] Background technique [0003] According to the requirements of the EU Packaging Materials Directive 94 / 62 / EC, the lead content in the tin layer of tinned steel sheets sold in EU countries must be below 100ppm, and only by reducing the lead content in the plating solution can the lead content in the tin layer be kept at 100ppm In the following, lead-free tin particles are often used abroad to achieve low lead in the plating solution. Due to cost issues, this method is not feasible in China. There have been applied studies on the use of barium salt precipitation to remove lead in China. Barium carbonate is mostly used as raw material, and barium carbonate reacts with sulfuric acid in the plating solution to form barium sulfate crystals. Buried principle, adsorption of lead in the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46B82Y30/00
CPCC01F11/462B82Y30/00C01P2004/64
Inventor 陆伟星万一群曹美霞王鑫艳陆永亮
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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