My country is a large coal-producing country, and the use of coal is very extensive. The corresponding waste coal water treatment has become a problem for many coal enterprises. For the treatment process of waste coal water, it adopts rough selection, heavy-medium cyclone beneficiation, slime flotation, and tailings thickening. Now, the process flow of slime water treatment is modified. In order to make the slime water settle quickly in the thickening tank, ensure the production of qualified washing water and filter press slime, ensure the production of qualified washing water and filter press slime, and make the production efficient and economical, it is necessary to choose a suitable flocculant to strengthen the slime water deal with. The production practice in recent years has proved that polyacrylamide has a good effect on the treatment of slime water, can accelerate the sedimentation of slime, and help filter press production.
Special polyacrylamide and anionic polyacrylamide flocculant for coal washing plants are used in coal washing and ore dressing. It can promote the rapid settlement of effective solid matter, destroy the stable double-charge structure in the slime water, make the suspended slime particles coagulate and settle, and clarify the slime water Recycling.
In order to optimize the treatment of slime wastewater efficiently, it is necessary to consider conditions such as slime water hardness, slime water concentration and particle size. Because the composition of coal slime is complex, the charge and surface adsorption capacity of various minerals are different, the peat washing water is more difficult to handle, and it is often necessary to add a flocculant in the front stage, such as polyaluminum chloride and polyferric sulfate. When choosing a suitable flocculant product, pay attention to the full dispersion of the polyacrylamide solution in the peat water during the use of the polyacrylamide solution. On the one hand, do not stir too fast to prevent the flocs from being destroyed; on the other hand, pay attention to polypropylene The uniformity of the mixing of the amide solution and the slime water makes the surface of the slime water more fully contact the polyacrylamide solution, which makes the charge matching better, which is conducive to flocculation and separation.
Polyacrylamide is used for coal washing. In addition to coal preparation, there are iron, manganese, copper, gold, zinc, etc. for beneficiation. These mine wastewaters are generally acidic. The neutralization method is generally used to adjust the pH value of this type of wastewater. Commonly used limestone and lime are used as regulators. For example, after iron ore wastewater is neutralized, the main components of the wastewater sludge are iron hydroxide Fe(oH)3 and colloid, Ca(OH)2 calcium hydroxide and colloid, Fe(OH)2 ferrous hydroxide particles, and Other ions. Cationic polyacrylamide (CPAM) is used to treat iron ore sludge dewatering, which can achieve good results. It is not difficult to find from some common cases. In fact, polyacrylamide has two applications in beneficiation:
1. It is often used for dewatering concentrates, accelerating the settling of frame mud, purifying backwater, and improving the working efficiency of the thickener.
2. Selective flocculation is adopted for the slurry of fine-grained minerals, and the surface characteristics of the target mineral particles are changed to appropriately increase the particle size, so that the flocculation and sedimentation are beneficial to the separation from the gangue.
Whether in coal preparation or other metal ore preparation, flocculant is undoubtedly a necessary agent, and it is also a relatively economical agent. The process of beneficiation is actually a process of creating value. As the current mainstream flocculant, the utilization value of polyacrylamide It has been widely promoted.
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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