Coal washing plants are currently also one of the industries with relatively large water consumption. A large amount of coal washing wastewater is not discharged up to the standard, causing water pollution, river siltation, and slime loss. It has caused great economic losses to the country and made the coal industry more water resources. Because of the shortage, it seriously restricts the development of coal production. Therefore, it is of great significance to develop new technologies and new processes for the efficient treatment of coal washing wastewater, Anionic polyacrylamide for coal washing plant.
In order to make the slime water settle quickly in the thickening tank, ensure the production of qualified washing water and press-filtered slime, and make the production run efficiently and economically, it is necessary to select a suitable flocculant to strengthen the treatment of the slime water. The production practice in recent years has proved that polypropylene phthalamide has a good effect on the treatment of slime water, can accelerate the sedimentation of slime, and contribute to the production of filter press, Anionic polyacrylamide for coal washing.
The coal washing wastewater from the coal industry, the slime water from the coal preparation plant, and the ground washing wastewater from the coal-fired power plant are all a mixture of water and fine coal. Its main characteristics are high turbidity, fine particle size of solids, and many negative surfaces on solid particles. The electric charge and the repulsive force between the same electric charges keep these particles in a dispersed state in the water, which are affected by gravity and Brownian motion; due to the interaction between the solid particles in the slime and water, the nature of the coal washing wastewater is quite complicated, not only of suspension Nature, also has colloidal properties.
At present, the treatment of slime water in the domestic industry generally uses polymer flocculants (polyacrylamide) to flocculate and settle to achieve solid-liquid separation. The high-molecular flocculant contacts with slime particles or slime colloid to neutralize the electrical properties of the slime surface, reduce the surface repulsion, and make the slime particles coagulate and settle. Different types and molecular weights of polyacrylamide flocculants should be selected for coal slime water with different particle sizes and coal slime wastewater in different regions. Generally, the coal washing industry uses anionic polyacrylamide for flocculation and precipitation. When using polyacrylamide for water treatment, try to adjust the pH of the raw water to about 7 before adding polyacrylamide, so that the polyacrylamide can exert a good effect.
Coal washing anionic polyacrylamide, polyacrylamide is used in the sedimentation process to promote solid-liquid separation. Then it is sent to the thickener, and the clean water is recovered by the overflow of the thickener and recycled. The powdered clean coal is recovered by filtration and centrifugation. Polyacrylamide is added again during filtration and centrifugation to improve separation efficiency. For the needs of users in this respect, Capitel Chemical has produced polyacrylamide for coal washing, which has better effects on different coal mines and greatly reduces the dosage of chemicals.
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The polyacrylamide flocculant used in coal mine wastewater can effectively clarify the coal mine wastewater, make the fine particles in the water quickly clump and settle, improve the working efficiency of the sedimentation tank, and thus achieve the effects of saving water and preventing pollution, and further improve the company's profit.
Polyacrylamide for coal mine is a more professional polyacrylamide. In fact, only the internal chemical composition has been adjusted. Special polyacrylamide for coal washing The special polyacrylamide for coal washing is several times better than ordinary polyacrylamide. It is very effective in coal washing and pressure filtration, or in the discharged groundwater. Its reaction time is about 5 seconds. Seeing the effect of precipitation, so many coal mines choose the reason for coal washing special flocculant. The coal mined in coal mining usually contains some impurities, and the separation efficiency of coal and impurities can be improved by adding a flotation agent. Clean coal floats out and the tail coal settles. The clean coal in the tail coal is then recovered by sedimentation, filtration or centrifugation. Polyacrylamide PAM is used in the sedimentation process to promote solid-liquid separation. It is then sent to the concentrator, where the clean water is recovered from the overflow of the concentrator and recycled. The powdered clean coal is recovered by filtration and centrifugation. Polyacrylamide is added again during filtration and centrifugation to improve the separation efficiency. In order to meet the needs of users in this aspect, we have produced special flocculants for coal washing, which have better effects on different coal mines, and also greatly reduce the amount of drugs used.
The usage index of Polyacrylamide for coal mine can refer to the following table:
Coal mine wastewater treatment polyacrylamide flocculant use method: 1, formulated into 0.2% concentration of aqueous solution is suitable for practical neutral salt-free water. 2. Due to the wide range of PH value of the water body applicable to this product, the general dosage is 0.1-10ppm (0.1-10mg/L). 3. Fully dissolved. The dissolving concentration is 0.2-0.4%. Non-ferrous containers should be used. When dissolving, the water body should be fully stirred up and then slowly and evenly add medicine powder to prevent blockage of pipes and pumps caused by large flocs and fish eyes; 4. The stirring speed is generally 200 rpm, and the time is not less than 60 minutes. Properly increasing the water temperature by 20-30 degrees Celsius can accelerate the dissolution. The temperature of the drug solution should be less than 60 degrees. 5. Add the dissolved aqueous solution to the coal mine wastewater evenly by using a valve or a metering pump to control the flow rate. 6. Determine the dosage. Determine the dosage by experiment before use. Because the dosage is too low, it has no effect, and the dosage is too high, but it has a reverse effect. When it exceeds a certain concentration, PAM not only does not flocculate, but is dispersed and used stably.
Precautions for the use of polyacrylamide. 1. If dissolved, improperly soluble flocculent suspended substances will hang on the surface of the water. It should be filtered off or slowly wait for dissolution before use, without affecting the use effect. 2. The amount of addition should be moderate, too much or too little can not play an obvious flocculation effect, users should adjust the amount according to different conditions such as wastewater water quality, water flow speed and solid content. 3. If the amount of flocculant used is small during use, the effect is not ideal, but when the amount is increased, it will cause refractory diseases such as wire drawing. The method of reducing or increasing the concentration of the flocculant solution and increasing the flow rate can be used to increase the amount of flocculant. Alternatively, the position of adding the flocculant can be moved back to increase the mixing time of the flocculant and the tailings water to solve the above problem.
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Record number：Guangdong ICP No. 16127109-1