CN202170278U - Stream and river water pollution treatment device for rare earth mining area - Google Patents

Abstract

The utility model relates to a stream and river water pollution treatment device for a rare earth mining area. The device consists of a reaction sedimentation tank, an acid solution tank, an impurity removing and clarification tank, a rare earth sedimentation tank and a rare earth feed liquid tank, wherein four submersible mixers are respectively arranged in the reaction sedimentation tank and the acid solution tank; and filter presses are respectively arranged in the acid solution tank and the rare earth sedimentation tank. The reaction sedimentation tank, the acid solution tank, the impurity removing and clarification tank, the rare earth sedimentation tank and the rare earth feed liquid tank are arranged in the device sequentially, and each tank is provided with an inlet and an outlet. The device has the advantages of simple structure and convenient operation. The device can filter the suspended matters in the stream and river water of the mining area, reduce the ammonia nitrogen content, chemical oxygen demand and rare earth and heavy metal ions in the stream and river water, change the pH value of the river water in the mining area and achieve the purpose of meeting the national second-class discharge standard to the downstream discharge of the river water. Meanwhile, the suspended matters are made into rare earth feed liquid after impurity removing, the residual micro rare earth resources in the stream or river water can be recovered, and the waste is changed into wealth.

Description

A stream and river water pollution treatment device in a rare earth mining area

technical field

The utility model relates to a treatment device for creek and river water pollution in a rare earth mining area, in particular to a device for treating stream and river water pollution in a rare earth mining area by a neutralization aeration method, and recovering residual traces of rare earth in the creek and river water , in order to achieve the purpose of protecting the environment, turning waste into treasure and recovering rare earths, it has a wide range of application value and prospects.

Background technique

The discharge of rare earth mine production wastewater has caused the pollution of creeks and rivers in the entire mine basin. The polluted water is acidic, has high ammonia nitrogen content, and the river water is turbid. Ammonia nitrogen has certain harm to human body and water body. Ammonia nitrogen in the water quality index is an important pollutant that causes water eutrophication and environmental pollution. It can make water lose its self-purification ability. Excessive ammonia nitrogen content in drinking water can cause gastrointestinal disorders and The emergence of endemic diseases, therefore, reducing or removing ammonia nitrogen has become an important part of wastewater treatment today. Finding a cheap wastewater purification material and treatment process to reduce the cost of polluted water treatment and improve purification efficiency has become an important part of the water treatment system. an important question. At present, there is a technology (patent application number: 201010294998.2) that uses organic extraction to treat wastewater from rare earth mining areas, and has achieved certain results. However, the organic phase will affect the water quality of rivers, which brings limitations to the application of this method.

Contents of the invention

Purpose of the invention: This utility model provides a device for treating stream and river pollution in the rare earth mining area, through electrolysis, neutralization and aeration methods, reducing the content of ammonia nitrogen, chemical oxygen demand and rare earth and other heavy metal ions in the stream and river water of the mining area content, change the pH of the river water in the mining area, and discharge river water that meets the national secondary discharge standard downstream to achieve the purpose of protecting the environment.

Technical solution: A stream and river water pollution treatment device in a rare earth mining area. The device is composed of a reaction sedimentation tank, an acid solution tank, an impurity removal clarification tank, a rare earth sedimentation tank and a rare earth material liquid tank. Each pool of the device is placed in sequence according to the reaction sedimentation pool, acid dissolution pool, impurity removal clarification pool, rare earth sedimentation pool, and rare earth material liquid pool, and each pool is equipped with a material inlet and outlet, of which the reaction sedimentation pool and the acid dissolution pool Four submersible mixers are installed in the tank, and a filter press is installed in the acid-dissolving tank and the rare earth sedimentation tank respectively. In the reaction sedimentation tank, through electrolysis, neutralization and aeration methods, the content of ammonia nitrogen, chemical oxygen demand and rare earth and other heavy metal ions in the creek and river water in the mining area can be reduced, and the pH of the river water in the mining area can be changed. The discharge to the downstream meets the national secondary discharge Standard river water to achieve the purpose of protecting the environment; in the acid-dissolving pool, use hydrochloric acid to dissolve the sediment cake; in the impurity removal and clarification tank, use 3# agent to speed up the clarification of impurities; Precipitate the rare earth material to obtain the rare earth hydroxide; in the rare earth feed liquid pool, react the rare earth hydroxide with hydrochloric acid to prepare the rare earth chloride feed liquid.

A stream and river water pollution treatment device in a rare earth mining area, the specific pollution treatment process is as follows:

1. Block water at the end of the creek or estuary in the rare earth mining area, and introduce the whole creek or river water polluted by the mine into the device In the reaction sedimentation tank, the electrolysis method is used to electrolyze the creek water or river water, and calcium hydroxide and 3# agent are added to the creek water or river water for multi-stage acid-base neutralization chemical reaction to adjust the pH value to 7-8 , so that suspended matter such as mud in creek water or river water is deposited in the sedimentation tank, and the concentration of mud and trace rare earth and other heavy metals and suspended matter in the supernatant river water in the sedimentation tank is reduced to below 0.001g/L. At the same time, the electrolytic water reaction or acid The heat of the alkali reaction realizes aeration and evaporation of ammonia nitrogen in stream water or river water. In addition, when discharging supernatant stream water or river water, impeller machinery or compressed air is used to stir stream water or river water, and multiple aeration is performed to evaporate stream water or river water. At the same time, use zeolite to absorb ammonia nitrogen in the water to further reduce the content of ammonia nitrogen, and finally achieve the filtration of suspended solids in the stream or river water in the mining area, clarify the stream and river water in the mining area, reduce the ammonia nitrogen content in the stream and river water in the mining area, and chemical oxygen demand and rare earth and other heavy metal ions, change the pH of streams and rivers in the mining area, and discharge downstream streams and rivers that meet the national secondary discharge standards;

2. Treat the mud settled in the reaction sedimentation tank, and recover the trace rare earth and other minerals lost in the mud: after clarification, discharge the supernatant stream or river water, filter the sediment mud into cakes, and discard the filtrate;

3. Filter cake acid dissolution: put the filter cake after press filtration into the acid dissolution pool of the device, take samples for analysis, add 1:3 hydrochloric acid according to the amount of rare earth, and mechanically stir, after complete reaction and dissolution, press filter with a filter press , the filtrate is put into the impurity removal and clarification tank of the device, and the residue is stored separately;

4. The filtrate is put into the impurity removal clarification tank, and when a certain amount is stored, the impurity removal is carried out. Add 3# agent to speed up the clarification of impurities and adjust the pH value of the impurity removal solution;

5. Introducing the clarified supernatant after impurity removal into the rare earth sedimentation tank, and precipitating the rare earth with hydroxide to obtain the rare earth hydroxide;

6. Pump the rare earth hydroxide to the filter press to make a filter cake, and discard the filtrate;

7. Put the rare earth hydroxide filter cake into the rare earth feed liquid pool, add hydrochloric acid, and react to make a rare earth chloride feed liquid (the measured rare earth concentration is greater than 1.2M) and send it to the rare earth smelter to separate the rare earth elements.

The utility model has the advantages of simple technical process and convenient operation, and no organic matter is selected in the whole treatment process, so the utility model has a good application prospect.

The device for treating stream and river water pollution in the rare earth mining area is characterized in that the device includes a reaction sedimentation tank, an acid solution tank, a clarification tank for removing impurities, a rare earth sedimentation tank and a rare earth material liquid tank.

The device for treating stream and river water pollution in the rare earth mining area is characterized in that the tanks in the device are placed in the order of reaction sedimentation tank, acid solution tank, impurity removal clarification tank, rare earth sedimentation tank, and rare earth feed liquid tank.

The stream and river pollution treatment device in the rare earth mining area is characterized in that four submersible mixers are respectively installed in the reaction sedimentation tank and the acid dissolution tank, and a filter press is respectively installed in the acid dissolution tank and the rare earth sedimentation tank.

The device for treating stream and river pollution in the rare earth mining area is characterized in that each pool is provided with material inlets and outlets.

The device for treating stream and river pollution in the rare earth mining area is characterized in that the filter cake is dissolved in the acid-dissolving pool.

The device for treating stream and river pollution in the rare earth mining area is characterized in that the obtained rare earth hydroxide is reacted with hydrochloric acid to produce a rare earth chloride feed solution for the rare earth smelter to separate the rare earth materials.

Description of drawings

Figure 1 is a schematic diagram of the stream and river water pollution treatment device in the rare earth mining area

Figure 2 is a flow chart of stream and river water pollution treatment in the rare earth mining area

Detailed ways

The utility model is described in detail below in conjunction with accompanying drawing and implementation example:

A device for treating stream and river pollution in a rare earth mining area. Its schematic diagram is shown in Figure 1, where 1 is the base of the device, 2 is the reaction sedimentation tank, 3 is the acid dissolution tank, 4 is the impurity removal clarification tank, and 5 is the rare earth precipitation Pool, 6 is the rare earth material liquid pool. Each pool of the device is arranged in sequence according to the reaction sedimentation pool, acid dissolution pool, impurity removal clarification pool, rare earth sedimentation pool, and rare earth material liquid pool, and each pool is equipped with a material inlet and outlet, of which the reaction sedimentation pool and the acid dissolution pool Four submersible mixers are installed in the tank, and a filter press is installed in the acid-dissolving tank and the rare earth sedimentation tank respectively.

A device for treating stream and river water pollution in a rare earth mining area. The schematic diagram of the specific pollution treatment process is shown in Figure 2. The detailed process is as follows:

1. Block water at the end of the creek or estuary in the rare earth mining area, and introduce the whole creek or river water polluted by the mine into the device In the reaction sedimentation tank, the electrolysis method is used to electrolyze the creek water or river water, and calcium hydroxide and 3# agent are added to the creek water or river water for multi-stage acid-base neutralization chemical reaction to adjust the pH value to 7-8 , let the mud and other suspended solids in the creek water or river water settle in the sedimentation tank, and the sedimentation tank clarifies the mud in the river water and reduces the concentration of heavy metals and suspended solids such as trace rare earths to below 0.001g/L. At the same time, it uses electrolytic water reaction or acid-base The heat of reaction realizes aeration and evaporation of ammonia nitrogen in creek water or river water. In addition, when discharging supernatant creek water or river water, impeller machinery or compressed air is used to stir the creek water or river water, and multiple aeration is carried out to evaporate creek water or river water. At the same time, use zeolite to absorb ammonia nitrogen in the water to further reduce the content of ammonia nitrogen, and finally achieve the filtration of suspended solids in the stream or river water in the mining area, clarify the stream and river water in the mining area, and reduce the ammonia nitrogen content and chemical oxygen demand in the stream and river water in the mining area And heavy metal ions such as rare earths, changing the pH of streams and rivers in the mining area, and discharging downstream streams and rivers that meet the national secondary discharge standards;

2. Treat the mud settled in the reaction sedimentation tank, and recover the trace rare earth and other minerals lost in the mud: after clarification, discharge the supernatant stream or river water, filter the sediment mud into cakes, and discard the filtrate;

3. Filter cake acid dissolution: put the filter cake after press filtration into the acid dissolution pool of the device, take samples for analysis, add 1:3 hydrochloric acid according to the amount of rare earth, and mechanically stir, after complete reaction and dissolution, press filter with a filter press , the filtrate is put into the impurity removal and clarification tank of the device, and the residue is stored separately;

4. The filtrate is put into the impurity removal clarification tank, and when a certain amount is stored, the impurity removal is carried out. Add 3# agent to speed up the clarification of impurities and adjust the pH value of the impurity removal solution;

5. Introducing the clarified supernatant after impurity removal into the rare earth sedimentation tank, and precipitating the rare earth with hydroxide to obtain the rare earth hydroxide;

6. Pump the rare earth hydroxide to the filter press to make a filter cake, and discard the filtrate;

7. Put the rare earth hydroxide filter cake into the rare earth feed liquid pool, add hydrochloric acid, and react to make a rare earth chloride feed liquid (the measured rare earth concentration is greater than 1.2M) and send it to the rare earth smelter to separate the rare earth elements.

The utility model has the advantages of simple technical process and convenient operation, and no organic matter is selected in the whole treatment process, so the utility model has a good application prospect.

Claims (3)

1. A stream and river water pollution treatment device in a rare earth mining area. The device is composed of a reaction sedimentation tank, an acid solution tank, an impurity removal clarifier, a rare earth sedimentation tank and a rare earth material liquid tank, and is placed in sequence. 2. The device for treating stream and river pollution in the rare earth mining area as claimed in claim 1, wherein each pool is provided with a material inlet and an outlet. 3. The rare earth mining area watershed creek and river water pollution treatment device as claimed in claim 1 is characterized in that 4 submersible mixers are respectively installed in the reaction sedimentation tank and the acid dissolution tank, and one is respectively installed in the acid dissolution tank and the rare earth sedimentation tank filter press. the

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