Unlock instant, AI-driven research and patent intelligence for your innovation.
Method for pretreating ardealite, ardealite crude product and recycled product
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 phosphogypsum and pretreatment technology, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium sulfate, etc., can solve the problems of high energy consumption, high cost, unfriendly environment, etc., and achieve low energy consumption, The effect of low cost and low labor cost
Active Publication Date: 2022-04-22
中国建筑材料工业规划研究院
View PDF4 Cites 0 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
[0008] The object of the present invention is to overcome the problems of high cost, high energy consumption and unfriendly environment in the existing phosphogypsum pretreatment method, and provide a pretreatment Process for phosphogypsum and crude and recycled products of phosphogypsum obtained after this pretreatment
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
[0055] Place 1 ton of phosphogypsum in the drying room, continuously heat the phosphogypsum, and monitor the temperature, humidity and vapor pressure in the environment to perform the following process:
[0056] (1) Initial stage: In a closed environment, during the process of gradually rising temperature, the water in phosphogypsum enters the air, the ambient humidity increases, and the vapor pressure increases; the vapor pressure gradually reaches saturation, and the temperature of the system is 71°C. Humidity is 89%, reach the first condition, after maintaining for 5 minutes, proceed to the next step;
[0057] (2) The second dynamic environment stage: the airtight environment is released, the steam is discharged through the pipeline and condensed and collected, the steam pressure in the drying chamber drops, and the humidity drops; when the temperature is 90°C and the humidity reaches 71%, it is determined that the second condition is met ;Proceed to the next step;
[0058...
Embodiment 2
[0063] Place 1 ton of phosphogypsum in the drying room, continuously heat the phosphogypsum, and monitor the temperature, humidity and vapor pressure in the drying room at the same time, and perform the following process:
[0064] (1) Initial stage: In a closed environment, in the process of gradually rising temperature, the water in phosphogypsum enters the air, the ambient humidity increases, and the vapor pressure increases; the vapor pressure gradually reaches saturation, and the temperature of the system is 68°C. Humidity is 92%, reach the first condition, after maintaining for 7 minutes, proceed to the next step;
[0065] (2) The second dynamic environment stage: the airtight environment is released, the steam is discharged through the pipeline and condensed and collected, the steam pressure in the drying chamber drops, and the humidity drops; when the temperature is 88°C and the humidity reaches 72%, it is determined that the second condition is met ;Proceed to the next...
Embodiment 3
[0071] According to the method of Example 1, the difference is that in the first dynamic environment stage, instead of maintaining a period of time under the saturated vapor pressure environment, it will be exposed to a closed environment once the saturated vapor pressure is reached.
[0072] Other operations were the same as in Example 1, and after about 1h5min, the crude phosphogypsum and condensed water were finally 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
Login to View More
Abstract
The invention relates to the field of industrial pretreatment, in particular to a method for pretreating ardealite, a crude ardealite product and a recycled ardealite product. The pretreatment method comprises the steps that phosphogypsum is placed in a first dynamic environment and a second dynamic environment which alternately occur, the first dynamic environment is carried out in a closed environment, and switching is carried out when a first condition is met or after the first condition is maintained for a period of time; the second dynamic environment is carried out in a non-closed environment, and switching is carried out when a second condition is met; the first condition comprises that the first temperature is 60-80 DEG C, and the first humidity is 80%-98%; the second condition comprises that the second temperature is 80-98 DEG C, and the second humidity is 60-80%; the difference between the first temperature and the second temperature is not less than 10 DEG C, and the difference between the first humidity and the second humidity is not less than 10%. According to the invention, impurities and free water in phosphogypsum can be effectively removed and can be recycled, so that energy conservation and environmental protection are realized; and fresh phosphogypsum can be directly treated.
Description
technical field [0001] The invention relates to the field of industrial pretreatment, in particular to a method for pretreatment of phosphogypsum and crude phosphogypsum and recycled products obtained after the pretreatment. Background technique [0002] Phosphogypsum is a solid waste discharged during the production of phosphatefertilizer and phosphoric acid. About 4.5-5t of phosphogypsum is produced for every 1t of phosphoric acid produced. In addition to the main component calciumsulfate, phosphogypsum also contains impurities such as phosphoric acid, silicon, magnesium, iron, aluminum, and organic impurities. [0003] As for the resource utilization of phosphogypsum, neither domestic nor foreign is satisfactory. An important reason for limiting the resource utilization of phosphogypsum is that there is no cost-effective way to deal with the large amount of free water and impurities contained in phosphogypsum. The methods commonly used in the prior art to pretreat pho...
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 
Login to View More