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Method for preparing PVC filling material from phosphogypsum as raw material

A technology of phosphogypsum and raw materials, applied in fibrous fillers, chemical instruments and methods, inorganic pigment treatment, etc., can solve the problems of complex composition, poor strength and toughness, and foaming of phosphogypsum

Inactive Publication Date: 2016-04-13
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, phosphogypsum is a solid waste in the phosphorus chemical industry, and it contains a large amount of impurities. Fresh phosphogypsum mainly exists in the form of calcium sulfate dihydrate. It is difficult to remove crystal water and organic impurities, and the energy consumption is high, which leads to the use of phosphogypsum instead of calcium carbonate po

Method used

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  • Method for preparing PVC filling material from phosphogypsum as raw material

Examples

Experimental program
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Embodiment 1

[0028]A kind of phosphogypsum is used as raw material to produce the filler method for PVC, after phosphogypsum and water are mixed according to the mass ratio of 1:1, stirring treatment 20min, and wherein adding nano silicon dioxide, the addition amount is 1% of the phosphogypsum mass, Stir it evenly, then raise its temperature to 80°C, and heat it while stirring. After the treatment time reaches 1 hour, pass in the gas containing carbon dioxide and calcium carbide ion under stirring, and the calcium ion in the solution is absorbed. After the carbonization rate reaches 15%, stir and react for 2 hours, then continue to feed the gas containing carbon dioxide into the reaction solution, and the feeding amount is equal to the first feeding amount, and then let it stand and age for 0.5 h, Then it was filtered and dried at a drying temperature of 80°C for 0.3 hours to obtain a phosphogypsum filler. The gas containing carbon dioxide, wherein the volume concentration containing carbo...

Embodiment 2

[0030] A method for using phosphogypsum as a raw material to produce PVC fillers, mixing phosphogypsum and water at a mass ratio of 1:10, stirring for 30 minutes, and adding nano silicon dioxide therein, the amount of which is 5% of the mass of phosphogypsum, Stir it evenly, then raise its temperature to 180°C, and heat it while stirring. After the treatment time reaches 3 hours, pass in gas containing carbon dioxide and calcium carbide ions under stirring, and wait until the calcium ions in the solution are absorbed. After the carbonization rate reaches 25%, stir and react for 5 hours, then continue to feed the gas containing carbon dioxide into the reaction solution, and the feeding amount is equal to the first feeding amount, and then let it stand and age for 1.5 h, Then it was filtered and dried at a drying temperature of 180°C for 1.5 hours to obtain a phosphogypsum filler. The gas containing carbon dioxide, wherein the volume concentration containing carbon dioxide is 33...

Embodiment 3

[0033] A kind of phosphogypsum is used as raw material to produce the filler method for PVC, after phosphogypsum and water are mixed according to mass ratio as 1:5, stir treatment 25min, and wherein add nano silicon dioxide, the addition amount is 3% of phosphogypsum mass, Stir it evenly, then raise its temperature to 120°C, and heat it while stirring. After the treatment time reaches 2 hours, add gas containing carbon dioxide to calcium carbide ion under stirring, and wait until the calcium ion in the solution is absorbed. After the carbonization rate reaches 20%, stir and react for 4 hours, and then continue to introduce gas containing carbon dioxide into the reaction solution, the amount of which is equal to the amount introduced for the first time, and then let it stand and age for 1 hour, and then It was filtered and dried at a drying temperature of 130°C for 1 hour to obtain a phosphogypsum filler. The gas containing carbon dioxide, wherein the volume concentration conta...

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Abstract

The invention relates to a method for preparing a PVC filling material from phosphogypsum as a raw material. The method comprises mixing phosphogypsum and water, adding nanometer silica into the mixture along with stirring under control of an addition amount, carrying out heating treatment so that silicon, impurities such as fluorine in phosphogypsum and other organic impurities undergo a reaction and impurity content of the phosphogypsum is reduced, feeding carbon dioxide gas into the reaction product along with stirring so that free calcium ions in the solution are partly carbonized, carrying out a cycle of carbon dioxide feeding and reaction again so that two-layer calcium ion carbide is formed on the surface of the phosphogypsum particle, and carrying out filtration and drying to obtain a filling material product with a complex structure. Through temperature control in drying, the phosphogypsum comprises calcium sulfate hemihydrate, III-type anhydrite and II-type anhydrite, quality of phosphogypsum as a filling material is improved, plasticity and rheological properties of the phosphogypsum as a filling material are improved, PVC enhancement and toughening performances are improved, PVC unit weight is improved and a production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of PVC fillers, in particular to a method for producing PVC fillers using phosphogypsum as a raw material. Background technique [0002] PVC is a general-purpose plastic with a wide range of uses. At present, the fillers added to PVC plastics are mainly calcium carbonate powder. Due to the high density of calcium carbonate powder, as the filling amount increases in PVC, the density of the finished product is higher and the bulk density is larger. In the prior art, on the one hand, PVC manufacturers require to reduce the production cost of PVC and increase the filling amount of fillers; on the other hand, they need to reduce the density of PVC and reduce the bulk density of PVC materials. Research on fillers, but all of them modify the traditional calcium carbonate powder, so that the calcium carbonate powder forms porous calcium carbonate, so as to reduce the mass of calcium carbonate powder per unit volume...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/06C09C3/08C08K9/04C08K3/30C08K3/22C08K3/36C08L27/06
CPCC09C1/02C08K3/22C08K3/30C08K3/36C08K9/08C08K2003/2206C08K2003/3045C08K2201/011C09C3/006C09C3/06C09C3/08C08L27/06
Inventor 杨步雷杨永彬向前勇王伟李泽钢
Owner GUIZHOU KAILIN GRP CO LTD