Technique for packing flue gas on surface of powder

A technology of wrapping and flue gas, which is applied to the device for coating liquid on the surface, special surface, powder suspension method granulation, etc. It can solve the problems that there is no flue gas wrapping powder surface technology, complex production process, etc., and it is not easy to achieve Volatility, strong hydrophobicity, effect of changing surface properties

Inactive Publication Date: 2009-07-22
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These wrapping agents all contain surfactants, oils, etc., and the production process is relatively complicated.
So far, there is no patent application for the technology of using flue gas to wrap the powder surface

Method used

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  • Technique for packing flue gas on surface of powder
  • Technique for packing flue gas on surface of powder
  • Technique for packing flue gas on surface of powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Using solid paraffin as a coating agent to wrap fertilizer powder

[0018] Test tube wrapping method: Add 10g of powder and measured paraffin into the test tube, keep it at a constant temperature of 90°C until all the paraffin is vaporized and evenly wrapped the powder, during which the paraffin must not be leaked. After cooling, samples were taken to measure the contact angle.

[0019] In the measurement of the contact angle of the Washburn dynamic method, the water is set to completely wet the surface of the uncoated powder, and the contact angle θ=0 0 , see Table 1 for the contact angles of the fertilizer product powders wrapped in liquid paraffin.

[0020] Table 1

[0021]

[0022] Under the conditions of enhanced caking test temperature of 24°C and relative humidity of 80%, the sample powder withstands about 710kg / m 2 Take out the sample after 24 hours; use a needle-shaped glass rod with a diameter of 2.16mm to measure the mass of the weight require...

Embodiment 2

[0026] Example 2 Using Cetyl Alcohol as a Coating Agent to Coat Fertilizer Powder

[0027] The hot nitrogen gas brings out steam through the boiling cetyl alcohol, so that it evenly wraps the preheated sample powder. After cooling, samples are taken to measure the contact angle, and the amount of cetyl alcohol on the surface of the powder is determined by oxidation. The results are shown in Table 3.

[0028] table 3

[0029]

[0030] In the caking test, the results of the mass of the weight required to insert the sample block are shown in Table 4.

[0031] Table 4

[0032]

[0033] The test results show that the mass of weights required after wrapping is greatly reduced, indicating that the possibility of monoammonium phosphate powder agglomeration is greatly reduced.

Embodiment 3

[0034] Embodiment 3 adopts incomplete burning of turpentine, so that it produces carbon black soot and wraps heavy superphosphate product powder, and its contact angle~90 0 .

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Abstract

The invention discloses technology for coating fume on the powder surface. The technology comprises that: oil compounds, or oil gas without complete combustion, or organic compounds or solution with high boiling point are heated for boiling or fuming, the generated vapor or fume is made to fumigate the solid powder, so that a coating membrane at the molecular level is formed on the surface of the solid powder; or the oil is incompletely combusted, the generated carbon black and fume coats the surface of the powder material. The organic compounds used for heating to generate the vapor or the fume are compounds with the boiling point of between 150 and 350 DEG C such as multi-carbon ethanol, multi-carbon carboxylic acid, multi-carbon amine, multi-carbon hydrocarbon or halogenated hydrocarbon or compound of the multi-carbon ethanol, multi-carbon carboxylic acid, multi-carbon amine, multi-carbon hydrocarbon or halogenated hydrocarbon. The use level of the coating agent is less than 0.1 percent. The method has the advantages of conveniently carrying out coating operation of the powder, and effectively achieving the aim of changing surface properties and making the powder not agglomerated without changing the composition and property of the powder; moreover, the method can carry out the coating operation of any powder in principle, particularly suitable for prevention of agglomeration of fertilizer powder products.

Description

technical field [0001] The present invention is related to the surface treatment technology of powder, and furthermore, belongs to the technology of wrapping smoke on the surface of powder. Background technique [0002] The research shows that the specific surface area of ​​powder materials is often relatively large, and there is a large surface energy, which has the tendency to absorb surrounding gases or substances to reduce the surface energy; or agglomerate to reduce the specific surface and reduce the surface energy. Through theoretical estimation, it can be known that after 1mol of water is dispersed into nanometer-scale tiny water droplets, their gas-liquid surface area can reach tens of thousands of m 2 , has an energy (surface energy) equivalent to the molar phase change enthalpy of vaporization. From this we can imagine the surface energy of micron and nanometer powders. Generally, the system has high energy and is often unstable. They always hope to release ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/30B01J2/16C05G3/00C05G3/10
Inventor 曾祥钦谢燕李焱喻仕瑞曹建新郭妤罗焕虎刘志春
Owner GUIZHOU UNIV
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