A kind of siderite modified sulfur light material and its preparation method and application

A light material, siderite technology, applied in applications, other household appliances, chemical instruments and methods, etc., can solve the problems of limited efficiency of nitrogen and phosphorus removal, difficulty in efficient application, increase of specific surface area, etc., to achieve easy microbial attachment , light weight and high reactivity

Active Publication Date: 2021-02-02
NANJING UNIV
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  • Description
  • Claims
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Problems solved by technology

[0009] Aiming at the problems of limited denitrification and phosphorus removal efficiency, large specificity, and difficulty in efficient application of siderite-based nitrogen and phosphorus removal materials in the existing sewage treatment technology, the present invention creatively provides a siderite-modified sulfur light Materials, through the high fusion of sulfur and siderite and foaming to reduce the quality of the material, greatly increase the specific surface area of ​​the material, achieve more microbial attachment and increase the rate of microbial utilization, thereby improving the removal of nitrogen and phosphorus pollutants Rate

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  • A kind of siderite modified sulfur light material and its preparation method and application
  • A kind of siderite modified sulfur light material and its preparation method and application

Examples

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preparation example Construction

[0035] A kind of preparation method of siderite modified sulfur light material of the present invention, comprises the following steps:

[0036] S1. Mix fine siderite with a particle size of ≤0.3 mm and sulfur at a mass ratio of 10:1 to 1:5, more preferably 3:1 to 1:2, and heat to 115 to 200°C, more preferably 140°C ~160°C, high-temperature melting to obtain a molten mixture of siderite and sulfur;

[0037] S2. Foaming the siderite and sulfur molten mixture obtained in step S1 by physical foaming or chemical foaming, cooling and molding to obtain a siderite modified sulfur light material, wherein the cooling molding method includes wet granulation, The steel belt is granulated or crushed and granulated after solidification.

[0038] Wet granulation means that the molten mixture of siderite and sulfur is dropped into water and cooled to form a solid material; steel belt granulation means that the molten mixture of siderite and sulfur is dropped on a steel belt and cooled to fo...

Embodiment 1

[0051] In this example, sulfur and siderite are uniformly mixed according to the mass ratio of 1:1, and the mixture is heated to 150°C for high-temperature melting to obtain a molten mixture of siderite and sulfur; under the condition of physical aeration, nitrogen is blown into the In the above-mentioned molten mixture, the siderite and sulfur molten mixture are foamed, and the molten mixture is mechanically stirred during the foaming process. The stirring speed is 200-300rpm, and the stirring time is 20 minutes, so that the bubbles are evenly dispersed in the molten mixture. In the mixture; finally cooled and formed to prepare the siderite modified sulfur light material, the obtained material is as figure 1 shown. The density of the siderite-modified sulfur light material prepared in this example is greater than that of water, measured to be about 2.13g / cm 3 , the porosity is 30.8%.

[0052] Take 10g of the crushed siderite modified sulfur light material and put it into th...

Embodiment 2

[0054] The basic content of this embodiment is the same as embodiment 1, and the difference is: the mass ratio of sulfur and siderite is 10:1 in the present embodiment; 95% of siderite quality and all sulfur are taken by weighing in the process of concrete mixing Mix to obtain a mixture, heat the mixture to 120°C for high-temperature melting to obtain a molten mixture of siderite and sulfur; at this mass ratio, the molten mixture of siderite and sulfur has a low viscosity, and it is necessary to add a chemical foaming agent, bicarbonate Sodium for foaming. Sulfur, siderite, foaming agent mass ratio is 300:30:2, the remaining 5% siderite is mixed with sodium bicarbonate, then the mixture of siderite and sodium bicarbonate is added to the above-mentioned siderite In the molten mixture of ore and sulfur, the molten mixture is magnetically stirred at the same time, the stirring speed is 50-100rpm, and the stirring time is 5 minutes; finally, it is cooled and formed to prepare the ...

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Abstract

The invention discloses a siderite modified sulphur lightweight material and a preparation method and application thereof, and belongs to the field of environment function materials and sewage treatment technology. The preparation method comprises the following steps: mixing siderite and sulphur and then heating for fusing, foaming the siderite and sulphur fusion mixture by a physical foaming or chemical foaming mode, and cooling for forming to obtain the siderite modified sulphur lightweight material. The prepared siderite modified sulphur lightweight material has characteristics of high specific surface area, light weight, high reactivity, easy microbial attachment, slow-release electron donor nitrogen-removal and iron ion phosphorus-removal and the like, can be used as a filling material for sewage treatment fluidized beds and fixed bed reactors, and deeply remove pollutants such as nitrogen, phosphorus, etc. in sewage through the microbial effect.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials and sewage treatment, and more specifically relates to a siderite-modified sulfur light material and its preparation method and application. Background technique [0002] In recent years, environmental protection has become the focus of society, and the state has invested a lot of money in the research, development and application of environmental protection technologies. Among them, the upgrading and transformation of sewage treatment is in full swing, and various technologies are also emerging. However, these technologies have problems such as high cost, limited effect, and the need to consume a large amount of material and energy during application. With the in-depth research on siderite, its application value in the field of sewage denitrification has also been discovered. [0003] After searching, it was found that the Chinese patent application number CN201410063...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F3/28C04B28/36C04B38/10C04B38/02C02F101/16C02F101/10
CPCC02F3/2806C02F3/34C02F2101/105C02F2101/16C04B28/36C04B2201/20C04B14/26C04B38/103C04B38/0074C04B22/106C04B38/02
Inventor 李睿华周立松沈思文罗黎煜关梦莎葛志斌王卫
Owner NANJING UNIV
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