1. The hazards of fluorine.
Fluorine is one of the essential trace elements in the human body and can accumulate in living organisms. There is no obvious storage phenomenon in the soft weave, intramuscular and plasma of the human body, but mainly accumulates in the hard tissue, bone and teeth. It has been reported that the soft water contains 04~0.At 7 mg l, it can prevent tooth and teeth. However, if you drink it for a long time, it contains fluoride 1More than 5mg of water can cause skeletal fluorosis. Therefore, excessive fluoride in mine water is a problem that needs to be solved.
In addition to severe dental fluorosis, fluorosis also has backache, stiffness, hunchback, and amputation. In addition, it can also cause anemia, leukopenia and other disease processes. To this end, all countries have formulated corresponding standards for the fluoride content in drinking water, and China's current drinking water standards stipulate that the fluoride content does not exceed 10 mg l, suitable concentration 05～1.0mg/l。
2. Current status of fluorine-containing mine water.
In general, the fluoride content of surface water is less than 10 mg l, unless it has been industrially contaminated. The amount of fluoride in groundwater varies greatly, and in areas with high fluoride, groundwater content can be as high as 20 mg l, and the amount of fluoride in groundwater is closely related to the type of rock it flows through. Fluorine-rich rocks and minerals have been transformed from a fixed state to an active state by physical and chemical actions for a long time in a long geological time, thus transferring them to groundwater. China's coal mines are mostly concentrated in semi-dry and early water-scarce areas, with poor water resources and a shortage of water for production and living. Therefore, it is necessary to purify and utilize mine water.
The water quality of coal mines in China can be divided into the following three types:
In addition to natural occurrence, it can also be caused by man-made, in mining areas, if there is a high content of soluble fluorine in electric fly ash, it is washed by rainwater and transferred to groundwater. It has seriously polluted the groundwater, making the groundwater fluoride exceed the standard by more than 20 times, and the fluorosis is very serious. Therefore, it is a very urgent issue to solve the problem of high fluoride water in mines.
3. New technology for fluoride-containing mine water defluoride.
According to the fluorine-containing characteristics of mine water and the physical and chemical properties of negative ions, the ion exchange resin process can be used for the standard treatment of fluorine-containing wastewater in mines, as well as for conventional fluorine-containing wastewater treatment.
Introduction to the fluoride removal process.
Over the years, drinking water fluoride removal generally uses reverse osmosis, aluminum salt precipitation, electrocoagulation method, adsorption method and ionic resin exchange method, etc., activated alumina removal effect is good, but the pH value of raw water needs to be adjusted, and the pH value is controlled at 65 can play the role of activated alumina, but the pH value of the raw water is constantly changing, so the operation of many treatment devices is very unstable, activated alumina will release a large number of aluminum ions when the pH of the raw water is weakly acidic, resulting in the problem of excessive aluminum, and aluminum poisoning will cause damage to the human nervous system.
The reverse osmosis membrane method can also achieve the effect of fluoride removal, which can remove fluoride at the same time, and reduce other indicators in the water, and the wastewater output is also particularly large, the equipment investment cost is high, and the operating cost is also high.
There is no introduction of harmful substances in resin fluoride removal, and the removal effect of fluoride can fully meet the content standard of drinking water.
CH-32 is mainly manifested in the following aspects of drinking water and groundwater fluoride removal
1. Single selective adsorption: the special structure of the resin functional group has specific selective adsorption for fluoride ions.
2. Stable and efficient: the fluoride ion concentration in the effluent can be as low as 1mg L, and no fluoride is detected during the working operation time.
3. Economical and reliable: the exchange capacity is stable and reusable after resin adsorption saturation and regeneration, and the energy consumption of equipment operation is low.
4. Easy operation and maintenance: high degree of automation, automatic manual control of water flow and regeneration process can be selected.
5. There are many specifications of equipment: design equipment of different specifications according to the water volume to easily cope with different water volumes.