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Method for preparing nano calcium sulfate

A technology of nano calcium sulfate and crystal form control agent, which is applied in nanotechnology, chemical instruments and methods, calcium/strontium/barium sulfate, etc., can solve the problems of difficult product handling and environmental pollution, and achieve the effect of growth inhibition.

Active Publication Date: 2017-02-08
SHAANXI LONGMEN IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems existing in the prior art, the object of the present invention is to provide a kind of method for preparing nano-calcium sulfate, and this method process is simple, and production cost is low, and it uses water as solvent rather than organic solvent, thereby overcomes organic solvent in It is easy to decompose at high temperature to produce toxic substances, the product is difficult to handle, and it is easy to cause pollution to the environment.

Method used

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  • Method for preparing nano calcium sulfate

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Embodiment 1

[0049] The method of utilizing sintering flue gas of the present embodiment to prepare nanometer calcium sulfate comprises the steps:

[0050] 1) Pass the sintering flue gas after dedusting, purification and cold humidification into the cooling tower for cooling and humidification, and the SO in the sintering flue gas after cooling and humidification 2 The concentration is 1800mg / m 3 ;

[0051] 2) Add water to the quicklime for digestion reaction to generate coarse lime milk, coarsely filter and refine the obtained coarse lime milk to obtain refined lime milk, and the obtained refined lime milk has a density of 1200kg / m 3 , adding 3% sulfuric acid solution with a mass fraction of 98% in the refined gray milk as a crystal form control agent, and emulsifying with a high-shear emulsifier to make the reaction slurry fully refined and uniform;

[0052] 3) adding a strengthening agent with a mass fraction of 2% to the emulsified gray milk, in parts by mass, the strengthening agent...

Embodiment 2

[0058] The method of utilizing sintering flue gas of the present embodiment to prepare nanometer calcium sulfate comprises the steps:

[0059] 1) Pass the sintering flue gas after dedusting, purification and cold humidification into the cooling tower for cooling and humidification, and the SO in the sintering flue gas after cooling and humidification 2 The concentration is 1500mg / m 3 ;

[0060] 2) Add water to quicklime for digestion reaction to generate coarse lime milk, coarsely filter and refine the obtained coarse lime milk to obtain refined lime milk, the density of the obtained refined lime milk is 1300kg / m 3 , adding 5% sulfuric acid solution with a mass fraction of 98% in the refined gray milk as a crystal form control agent, and emulsifying with a high-shear emulsifier to make the reaction slurry fully refined and uniform;

[0061] 3) adding a strengthening agent with a mass fraction of 4% to the emulsified lime milk, in parts by mass, the strengthening agent is mad...

Embodiment 3

[0067] The method of utilizing sintering flue gas of the present embodiment to prepare nanometer calcium sulfate comprises the steps:

[0068] 1) Pass the sintering flue gas after dedusting, purification and cold humidification into the cooling tower for cooling and humidification, and the SO in the sintering flue gas after cooling and humidification 2 The concentration is 2000mg / m 3 ;

[0069] 2) Add water to the quicklime for digestion reaction to generate coarse lime milk, coarsely filter and refine the obtained coarse lime milk to obtain refined lime milk, and the obtained refined lime milk has a density of 1250kg / m 3 , adding a mass fraction of 2% sulfuric acid solution with a mass fraction of 98% in the refined gray milk as a crystal form control agent, and emulsifying with a high-shear emulsifier to make the reaction slurry fully refined and uniform;

[0070] 3) adding a strengthening agent with a mass fraction of 5% to the emulsified lime milk, in parts by mass, the ...

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Abstract

The invention relates to the field of chemical industry and in particular to a method for preparing nano calcium sulfate. The method comprises the following steps: adding a crystal form control agent into refined lime milk to produce a CaSO4 crystal nucleus, and fully emulsifying the lime milk; atomizing the lime milk to be sprayed into an absorption tower, introducing sintering flue gas and cool-humidified oxidation air into the absorption tower, thereby obtaining gypsum slurry, wherein the sintering flue gas needs to be subjected to dust extraction and purification and cooling humidification before introduction; adding a modifier into the gypsum slurry for performing surface modification treatment, so that the surface of the produced CaSO4 powder is hydrophobic; and preparing nano calcium sulfate through the gypsum slurry subjected to surface modification treatment. The nano calcium sulfate is directly produced by utilizing SO2 in the sintering flue gas, so that the environmental pollution problem is solved, and a comprehensive resource utilization aim is achieved.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of chemical industry, in particular to a method for preparing nanometer calcium sulfate. [0003] 【Background technique】 [0004] At present, there are mainly microemulsion method and solvothermal method for preparing nano-calcium sulfate at home and abroad. Microemulsion is the use of calcium salt solution and sulfate solution to form a thermodynamically stable, uniform and transparent emulsion under the action of surfactants. In the emulsion, nano-calcium sulfate is washed out from the solid phase through nucleation, coalescence, agglomeration, and heat treatment. method, the calcium salt and sulfate solutions required for the production of this method need to be specially produced, which has the disadvantage of high production cost. Solvothermal method is a new method for preparing nanomaterials developed on the basis of hydrothermal synthesis. Organic solvents are used instead of water, but organic solven...

Claims

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Application Information

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IPC IPC(8): C01F11/46B82Y40/00
CPCC01F11/464C01F11/466C01P2004/64
Inventor 张朝晖刘佰龙冯璐万江凯
Owner SHAANXI LONGMEN IRON & STEEL
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