Preparation of hydrophobic nature calcium sulphate crystal whisker with liquid phase method of sodium sulfate wastewater in situ
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A calcium sulfate whisker, in-situ preparation technology, applied in calcium/strontium/barium sulfate, single crystal growth, crystal growth, etc.
Inactive Publication Date: 2009-01-14
JILIN UNIV
View PDF0 Cites 25 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0006] So far, there are no literature and patent reports on the synthesis of hydrophobic calcium sulfate whiskers as a reinforcing agent at home and abroad, especially there is no research report on the synthesis of hydrophobic calcium sulfate whiskers by in-situ one-step precipitation method
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0011] 1. Put 50ml of calcium nitrate solution with a concentration of 0.5mol / l in a three-necked flask and put it in a water bath at 30°C, add a surfactant and stir evenly.
[0012] 2. Under stirring, add a certain amount of sodium sulfate wastewater;
[0013] 3. Keep the temperature and continue to stir for 3 hours to form a white precipitate;
[0014] 4. Filter and wash the above product;
[0015] After dehydration and drying at 5.60°C, a calcium sulfate whisker powder with a diameter of 2 μm, a length of 30 μm, and an aspect ratio of 15 was obtained.
Embodiment 2
[0017] 1. Put 50ml of calcium salt solution with a concentration of 0.5mol / l in a three-necked flask and put it in a water bath at 50°C, add surfactant and stir evenly.
[0018] 2. Under stirring, add a certain amount of sodium sulfate wastewater;
[0019] 3. Keep the temperature and continue to stir for 3 hours, a small amount of product floats on the water surface;
[0020] 4. Filter and wash the above product;
[0021] After dehydration and drying at 5.60°C, a calcium sulfate whisker powder with a diameter of 2 μm, a length of 60 μm, and an aspect ratio of 30 was obtained.
Embodiment 3
[0023] 1. Put 50ml of calcium salt solution with a concentration of 0.5mol / l in a three-necked flask and put it in a 70°C water bath, add surfactant and stir evenly.
[0024] 2. Under stirring, add a certain amount of sodium sulfate wastewater;
[0025] 3. Keep the temperature and continue to stir for 3 hours, and some products float on the water surface;
[0026] 4. Filter and wash the above product;
[0027] After dehydration and drying at 5.60°C, a calcium sulfate whisker powder with a diameter of 2 μm, a length of 100 μm, and an aspect ratio of 50 was obtained.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
diameter
aaaaa
aaaaa
length
aaaaa
aaaaa
diameter
aaaaa
aaaaa
Login to view more
Abstract
The invention relates to a normal-pressure low-temperature liquid phase in situ hydrophobic calcium sulfate crystal whisker preparation method, in which sodium sulfate waste water is adopted as a raw material. The preparation method comprises the steps: a certain amount of calcium salt of 0.5 to 1mol/L is added in a three-necked bottle, a surface active agent is added thereto, and after the mixture is evenly blended, a certain amount of sodium sulfate waste water is added, the temperature is increased to 30 to 70 DEG C, the mixture is blended at a constant temperature to cause the crystallizing reaction for 3 to 7 hours, the obtained white product is dried and treated byheat at the temperature of 60 to 200 DEG C after being filtered and cleaned, the calcium sulfate crystal whisker powder with the diameter of 1 to 2 micron, the length of 30 to 50 micron, and the length-diameter ratio of 15 to 50 is obtained, the filtered fluid is a salt solution as much again as the raw material, sodium chloride is produced based thereon, and the secondary utilization of the waste fluid is realized. The invention has the advantages that the sodium sulfate waste water is simply treated during the preparation process, the process is simplified, the energy resources are saved, the cost is reduced, the recycling and utilization of the renewable resources are realized, and the product is provided with higher economic value and social value.
Description
technical field [0001] The invention relates to a new method for treating sodium sulfate wastewater, in particular to a new method for preparing hydrophobic calcium sulfate whiskers in situ using sodium sulfate wastewater as a raw material in normal-pressure low-temperature liquid phase. Background technique [0002] Whisker is a kind of fibrous single crystal material. Whisker-reinforced plastics appeared as early as the 1960s, but due to the complicated production process and high price at that time, the application was limited. It was not until the 1980s that Japan took the lead in developing cheap potassium titanate whiskers, which were used as reinforcing agents in ceramics and plastics. Since then, the research, development, and application of whiskers have made great progress in other developed countries, and have now expanded to the fields of automobiles, electronic appliances, instrumentation, and machinery manufacturing. The research on inorganic salt whiskers in ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more