Efficient fluorine removal agent as well as preparation method and use method thereof

Abstract

The invention discloses an efficient fluorine removal agent which is mainly prepared from the following raw materials in parts by mass: 50-70 parts of aluminum sulfate, 10-30 parts of polyaluminum chloride, 6-16 parts of polyaluminum ferric chloride, 4-11 parts of calcium chloride, 4-11 parts of ferric chloride and 1-5 parts of a flocculating agent. The invention further discloses a preparation method and a use method of the efficient fluorine removal agent. The efficient fluorine removal agent is high in fluoride removal rate, simple in production process, low in cost, stable in removal effect and simple in adding method.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a high-efficiency defluoridation agent and a preparation method thereof. Background technique [0002] Fluorine is an inherent chemical substance in the natural environment, and it is ubiquitous in various media, such as soil, water, air, plants, animals and the human body. With the development of the economy and the continuous improvement of people's living standards, the problem of environmental fluorine pollution is becoming more and more serious. After fluorine-containing compounds enter the air from the pollution source, they go through the process of dry and wet deposition and act on the surrounding environment, such as (plants, soil, water and human body, etc.), and enter the human and animal bodies through the food chain and drinking water process to cause harm. With the continuous development of the economy, a large number of aluminum smelters and phosphate fert...

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Problems solved by technology

Calcium salt precipitation defluoridation agent mainly adds lime to the wastewater, so that fluoride ions and calcium ions can be removed by CaF2 precipitation. This process has the advantages of simple method, convenient treatment, and low cost, but it is difficult to reach the standard after treatment The fluorine content in the wastewater treated with lime is generally not lower than 20-30mg / L), the sludge settles slowly and the dehydration is difficult, etc.; the adsorption defluoridation agent mainly includes activated alumina, bone charcoal, calcium hydroxyphosphate, zeolite, Volcanic rock, etc., the commonly used activated alumina has a low adsorption capacity, generally only 5-8mg / g, and is easy to dissolve, so the adsorption method needs to use an adsorbent with high selectivity and high adsorption capacity. If the adsorbent has a low adsorption capacity, it needs Frequent regeneration, especially when the fluorine concentration in the raw water is high, and the general adsorption technology has the problem of (strongly alkaline) regeneration waste liquid disposal; coagulation defluoridation agents mainly include polyaluminum ferric chloride, aluminum chloride, basic Aluminum chloride and other inorganic salt coagulants. At present, a single coagulant is commonly used in the industry to treat fluorine-containing wastewater, such as polyaluminum ferric chloride, but the dosage of polyaluminum ferric chloride is too large, and the treatment effect Poor, effluent pH index is low

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