A kind of preparation method of phosphorus recovery crystal

Abstract

The invention relates to the field of water treatment in environmental engineering and particularly relates to a method for preparing crystals for recovering phosphorus. The method comprise the steps of obtaining a siliceous material; obtaining a calcareous material; and mixing a mixture of the calcium material and the siliceous material with water to obtain slurry, mixing the slurry with an organic solvent, adjusting the pH value to be 12.5-13.5, and stirring and reacting for 2-3 hours under the conditions that the temperature is 100-105 DEG C and the pressure is 0.1-0.2Mpa to obtain the finished product. By virtue of the method, the problems of high cost and high energy consumption caused by the traditional high-temperature and high-pressure hydrothermal reaction conditions are avoided, and a convenient way is provided for the development and application of phosphorus recycled materials; the problem of agglomeration of particles which often arises in a formation process of hydroxyl rankinite is effectively prevented, the specific surface area of the hydroxyl rankinite is increased and the hydroxyl rankinite with a porous structure is obtained; the structure is very conducive to the recovery of phosphorus by hydroxyl rankinite and provides an effective way for recycling phosphorus resources.

Description

technical field [0001] The invention relates to the field of environmental engineering water treatment, in particular to a method for preparing phosphorous recovery crystal hydroxy-notlite. Background technique [0002] Phosphorus is one of the essential elements of all cells in an organism. Phosphorus is also an important component of adenosine triphosphate (ATP), the key substance of human genetic material nucleic acid and energy conversion, and plays a very important role in various life activities of humans, animals and plants. Phosphorus is very slow in migration and transformation. There is almost no natural circulation pathway in nature, and most of it flows in one direction in the biosphere. It is a non-renewable and irreplaceable precious resource. According to statistics from the U.S. Geological Survey, the world's phosphate rock economic reserves are 18 billion tons, and the basic reserves are 50 billion tons (economic reserves refer to phosphate rocks whose minin...

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Problems solved by technology

However, this higher temperature condition corresponds to higher pressure (1.6~2.4MPa), and this high-pressure reaction needs to be carried out in a high-pressure reactor, which not only increases the cost of material synthesis, but also increases the cost of the reaction. The required energy consumption, at the same time, will also make the synthesis reaction has a certain degree of danger

In addition, since SiO 2 The low reactivity of the raw materials generally prevents them from effectively participating in the formation of hydroxynotlite

A lot of residual SiO 2 A silicon-rich layer is formed on the surface of hydroxynotlite, which leads to the blockage of the pores of hydroxynotlite, and also weakens the calcium-dissolving and alkali-supplying properties of hydroxynotlite.

[0007] The summary analysis shows that xonotlite or tobermorite currently used for phosphorus recovery does not match the physical and chemical properties of the crystal seeds required by the hydroxyapatite crystallization method, and the weak calcium-dissolving and alkali-supply properties make the existing crystal The phosphorus recovery performance of the species is poor, so it is not suitable as a crystal seed for phosphorus recovery by the hydroxyapatite crystallization method, and its synthesis method is also not suitable for preparing a crystal seed with calcium-dissolving and alkali-supplying properties.

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