Extractant composition and resource utilization method of iron-containing wastewater

Abstract

The invention provides an extractant composition. The extractant composition comprises the following components in percentage by mass: 20-40% of a phosphate extractant as shown in a formula 1, 35-50%of C6-C10 monohydric alcohol and the balance of a diluent. The invention further provides a resource utilization method of the iron-containing wastewater, and the extractant composition is used in theresource utilization method. The extractant composition disclosed by the invention does not need to use an organic amine extractant, is simple in extraction system and relatively low in cost, and does not easily generate a third phase even under high-concentration iron, so that the extractant composition can be suitable for extraction treatment of various iron-containing wastewater. The resourceutilization method provided by the invention can effectively extract and separate iron from the iron-containing wastewater for resource utilization, is very suitable for large-scale application, and has important economic and social values;.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to an extractant composition and a resource utilization method of iron-containing wastewater using the extractant composition. Background technique [0002] Fly ash is one of the industrial wastes with the largest discharge in my country, and unreasonable treatment will cause serious social and environmental problems. At the same time, fly ash is rich in Al 2 o 3 , is an important non-traditional alumina resource and a potential bauxite substitute. Therefore, the comprehensive utilization of fly ash to extract alumina has become a major research hotspot. Among them, Shenhua Group Zhuneng Resources Comprehensive Development Co., Ltd. has researched and developed the process of extracting alumina from fly ash by "one-step acid dissolution method". In this process, the fly ash first undergoes a one-step acid dissolution process, in which aluminum, gallium, iron and some...

AI Technical Summary

Problems solved by technology

Chinese patent CN102061398A adopts the extraction system of "N503-isooctanol-sulfonated kerosene" to carry out three-stage extraction on the solution containing iron 2-7g / L, and then back-extract the iron with 2% oxalic acid and 1 mol / L hydrochloric acid , the disadvantage is that the extraction system has a weak ability to extract iron, and back extraction requires oxalic acid and 1 mol / L hydrochloric acid, the consumption of raw and auxiliary materials is high, and it is difficult to realize industrial application

Li Mingyu and others invented a method for extracting and separating iron and aluminum from the hydrochloric acid system. The extraction system used is "N503-TBP-n-octanol-sulfonated kerosene". This extraction system has high selectivity and aluminum is not extracted. The separation of iron and aluminum is thorough, but the concentration of ferric iron it targets is 50-60g / L, and there is no mention of the extraction and separation of ferric iron containing more than 60g / L

For the extraction and separation of high-concentration iron, Chinese patent CN 110885931A adopts the extraction system of "N,N-bis(1-methylheptyl) caproamide (N503)-tributyl phosphate-sec-octanol-sulfonated kerosene", to Fe 3+ = 60 ~ 120g / L solution for extraction, realizing the resource recycling of iron ions, aluminum ions and hydrochloric acid in the waste liquid, but in the extraction system used by this technology, the proportion of N503 has reached 30%, and N503 Expensive, and the extraction system is relatively complicated

[0004] Based on the above-mentioned technologies, it is not difficult to see that most of the existing iron extraction systems use organic amine extractants, or use organic amine extractants and phosphate ester extractants in combination. Organic amine extractants are expensive, resulting in resource utilization of wastewater higher cost

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