Method for removing nitrogen and phosphorus from water by using calcium silicate prepared from silicon recycled from red mud

A calcium silicate and water removal technology, which is applied in the direction of silicate, alkaline earth metal silicate, chemical instruments and methods, etc., can solve the problems of polluting surface water bodies, difficult treatment, poor biodegradability of livestock and poultry breeding wastewater, etc. , to achieve the effect of simple operation

Active Publication Date: 2017-05-10
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of livestock and poultry wastewater has brought a series of environmental pollution problems, and the pollution is relatively concentrated and difficult to deal with.
The direct discharge of wastewater from livestock and poultry farming will no

Method used

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Effect test

specific Embodiment approach 1

[0012] Specific embodiment one: In this embodiment, a method for preparing calcium silicate to remove nitrogen and phosphorus in water by using silicon recovered from red mud is carried out in the following steps:

[0013] 1. Acid leaching extraction: Add red mud powder into dilute hydrochloric acid with a concentration of 1-5mol / L, the solid-to-liquid ratio is 1:8-1:15, and the acid leaching temperature is 50°C-100°C and stirred for 1h-3h, then The leaching liquid and leaching slag are separated from solid and liquid by centrifugation, the leaching slag is washed and dried with distilled water several times, and then the leaching slag is added to 50% to 80% concentrated sulfuric acid at a solid-to-liquid ratio of 1:8 to 1:20. The leaching temperature is 50°C-100°C, stirred and leached for 1h-3h, and then separated from the solid and liquid by centrifugation to obtain the leached slag as silica;

[0014] 2. Calcium silicate preparation: quicklime CaO and SiO 2 Mix and stir fo...

specific Embodiment approach 2

[0016] Embodiment 2: This implementation method differs from Embodiment 1 in that: the red mud is leached for 1.5 hours at a solid-to-liquid ratio of 1:16, a dilute hydrochloric acid concentration of 3 mol / L, and an acid leaching temperature of 90°C. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0017] Specific implementation mode three: the difference between this implementation method and specific implementation mode one or two is that the first step acid leaching residue is leached for 2 hours at a solid-to-liquid ratio of 1:10, 90% concentrated sulfuric acid, and an acid leaching temperature of 90°C. . Others are the same as the specific embodiment 1 to 2.

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Abstract

The invention discloses a method for removing nitrogen and phosphorus from water by using calcium silicate prepared from silicon recycled from red mud, and relates to a method for removing nitrogen and phosphorus from water. By the method, the problems of waste resource utilization and removal of excess nitrogen and phosphorus from water are solved. The method comprises the following steps: leaching most of metal oxides from the red mud by using dilute hydrochloric acid first and then leaching titanium and rare earth elements from the red mud by using concentrated sulfuric acid so as to leave silicon dioxide powder, and then preparing the extracted silicon dioxide into calcium silicate by a hydrothermal method. A certain amount of calcium silicate is added into waste water containing nitrogen and phosphorus, the waste water is oscillated at a certain temperature, ammonia nitrogen is removed from water through gas-liquid separation, and phosphorus is removed from water through ligand exchange and chemical precipitation.

Description

technical field [0001] The invention relates to a method for recycling waste and simultaneously removing nitrogen and phosphorus in water. Background technique [0002] In recent years, with the continuous development of my country's economy, industrial and agricultural structures have also been adjusted. While the aluminum industry continues to develop, a large amount of red mud waste is produced. It is one of the bottleneck problems restricting the sustainable development of my country's aluminum industry, and the removal of red mud waste is a major problem in my country's aluminum industry. The accumulation of red mud will cause a large amount of waste lye to seep into the nearby land, resulting in alkalization and swamping of the soil, polluting surface and underground water sources, and drinking such water sources for a long time will affect human health. Therefore, the rational disposal and resource utilization of red mud is of great significance. [0003] In my cou...

Claims

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Application Information

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IPC IPC(8): C01B33/24C02F1/52C02F1/66C02F101/16C02F101/10
CPCC01B33/24C02F1/5236C02F1/66C02F2101/105C02F2101/16
Inventor 朱琦司麒石邢子鹏
Owner HEILONGJIANG UNIV
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