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Modification method of phosphogypsum for PVC material production

A PVC material and phosphogypsum technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve problems such as different crystal water content, different rheology and plasticity, and different types of phosphogypsum. Achieve the effect of improving strength and toughness and improving processing rheology

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

AI Technical Summary

Problems solved by technology

[0004] However, for phosphogypsum with relatively complex material composition, when it is modified, it will vary with the temperature, so that the crystal water content in it will be different, and with the fineness of grinding and the number of times of grinding treatment Different, the amount of crystal water excluded and the type of phosphogypsum formed are completely different; it is also based on this that the rheology and plasticity of phosphogypsum are different under different conditions , even after being added to plastic processing as a filler, there are differences in the improvement of the plasticizing and rheological properties of plastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for modifying phosphogypsum for PVC material production, the fresh phosphogypsum is mixed with quicklime, the pH value of the fresh phosphogypsum is adjusted to 6, and the phosphogypsum is stirred in a heater while heating, and the temperature is controlled with a thermometer After heat treatment for 60min at 150°C, a mixed material was obtained; 1% solid paraffin was added to the mixed material, and after stirring evenly, it was placed in a grinder for one time grinding, passed through a 100-mesh vibrating screen, and then The sieve bottom material is placed in a frying pan with a temperature of 180 ° C for 20 minutes, and then placed in a grinder for secondary grinding into powder, passed through a 290-mesh vibrating sieve, and sieved with a 325-mesh sieve. Amount≤5%.

[0022] According to "Determination of Crystal Water Content of Gypsum of Building" GB / T17669.2, the composition was tested, and it was concluded that the content of calcium sulfate hemihydrate...

Embodiment 2

[0024] A method for modifying phosphogypsum used in the production of PVC materials. The fresh phosphogypsum is mixed with quicklime, the pH value of the fresh phosphogypsum is adjusted to 8, and the phosphogypsum is stirred in a heater, and the temperature is controlled with a thermometer. After heating for 80min at 180°C, a mixed material was obtained; 3% of the weight of the mixed material was added to it, and after stirring evenly, it was placed in a grinder for one time grinding, and passed through a 200-mesh vibrating screen, and then sieved. The bottom material is placed in a frying pan with a temperature of 200 ° C for 30 minutes, and then placed in a grinder for secondary grinding into powder, passed through a 310-mesh vibrating sieve, and sieved with a 325-mesh sieve. ≤5%. The paraffin is liquid paraffin.

[0025] According to "Determination of Crystal Water Content of Gypsum of Building" GB / T17669.2, the composition was tested, and the content of calcium sulfate he...

Embodiment 3

[0027] A method for modifying phosphogypsum used in the production of PVC materials. The fresh phosphogypsum is mixed with quicklime, the pH value of the fresh phosphogypsum is adjusted to 7, and the phosphogypsum is stirred in a heater, and the temperature is controlled with a thermometer. After heating for 70min at 170°C, a mixed material was obtained; 2% of the mixed material was added with liquid paraffin, after stirring evenly, it was placed in a grinder for one time grinding, and passed through a 150-mesh vibrating screen, and then The sieve bottom material is placed in a frying pan with a temperature of 190 ° C for 25 minutes, and then placed in a grinder for secondary grinding into powder, passed through a 300-mesh vibrating sieve, and sieved with a 325-mesh sieve. Amount≤5%. After grinding through the vibrating screen once, the step of adding nano-silica is also included. The added amount of the nano-silicon dioxide accounts for 11% of the mass of the mixed material....

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Abstract

The invention relates to the technical field of PVC production filling materials and especially relates to a modification method of phosphogypsum for PVC material production. The method comprises mixing fresh phosphogypsum and quicklime until pH is in a range of 6-8 so that phosphogypsum free water content is reduced, carrying out heating treatment through a stirring heater, controlling the temperature in a range of 150-180 DEG C so that the fresh phosphogypsum is transformed into semi-hydrated phosphogypsum, adding paraffin into the semi-hydrated phosphogypsum so that phosphogypsum plasticity and rheological properties are improved and the dry phosphogypsum adsorbs water to form crystal water with an unstable structure, carrying out dry grinding and screening so that crystal water in the phosphogypsum is exposed, related content of phosphogypsum impurities in unit volume is reduced and phosphogypsum whiteness is improved, and carrying out stir-frying at a temperature of 180-200 DEG C so that a part of crystal water in phosphogypsum is lost. The prepared phosphogypsum is a mixture of semi-hydrated gypsum, III-type anhydrite and II-type anhydrite, has high rheological properties and plasticity and improves PVC quality.

Description

technical field [0001] The invention relates to the technical field of fillers for PVC production, in particular to a method for modifying phosphogypsum for PVC material production. Background technique [0002] In plastic processing, adding powder fillers can increase and reduce costs, improve or improve the physical and mechanical properties, wear resistance, thermal properties, and aging resistance of plastic products, and overcome the low temperature resistance and low temperature resistance of plastics. Rigidity, easy expansion, easy creep and other shortcomings. Therefore, the filler has both an incremental effect and a modification effect; some fillers are active and can also play a reinforcing role. Phosphogypsum is the solid waste residue of the phosphate fertilizer industry, and about 4.5-5.0t of phosphogypsum are produced for every 1t of phosphoric acid produced. The annual output of phosphogypsum waste residue in my country reaches 25-30Mt. Phosphorus gypsum c...

Claims

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Application Information

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