Coal washing use anionic polyacrylamide is a more professional polyacrylamide. In fact, only the internal chemical composition content has been adjusted. The effect of anionic polyacrylamide for coal washing is several times better than ordinary polyacrylamide, and the effect is very obvious in coal washing press filter, or in the discharged groundwater. The reaction time of anionic polyacrylamide for coal washing is about 5 seconds. The effect of precipitation can be seen, so many coal mines choose anionic polyacrylamide for coal washing.
Coal washing use anionic polyacrylamide belongs to anionic type, also known as special agent for coal washing. The molecular weight is from 8 million to 18 million. Anionic polyacrylamide for coal washing In order to make the slime water settle quickly in the thickening tank, ensure the production of qualified washing water and press filter slime, and make the production run efficiently and economically, it is necessary to select a suitable flocculant to strengthen the treatment of slime water.
Exterior | White particle |
Solid content | ≥88% |
Solid content | 6-18 million |
charge density | 10-40（Mole %） |
Coal washing use anionic polyacrylamide is a mixture of water and fine coal powder in coal washing wastewater in the coal industry, coal slime water in coal preparation plants, and ground flushing wastewater in coal-fired power plants. The main feature of anionic polyacrylamide for coal washing is high turbidity , the particle size of the solid is fine, and the surface of the solid particle is mostly negatively charged. The repulsion between the same-sex charges keeps these particles dispersed in the water, which is affected by gravity and Brownian motion; due to the interaction between the solid particle interface in the slime water (such as Adsorption, dissolution, compounding, etc.), the properties of coal washing wastewater are quite complex, not only the properties of suspension, but also the properties of colloid. Due to the above reasons, it is difficult to clarify coal washing wastewater naturally, and the supernatant of this kind of wastewater after sedimentation is still a black liquid with a large amount of suspended matter such as coal slime, which contains various additives and heavy metals in the coal preparation process. substance. A large amount of coal washing wastewater is not discharged up to the standard, causing water pollution, river silting, and coal slime loss, which has caused great economic losses to the country, and also made the coal industry more scarce in water resources, seriously restricting the development of coal production. New technologies and processes for efficient treatment of coal washing wastewater are of great significance.
Anionic polyacrylamide for coal washing In order to make the slime water settle quickly in the thickening tank, ensure the production of qualified washing water and press filter slime, and make the production run efficiently and economically, it is necessary to select a suitable flocculant to strengthen the treatment of slime water. The production practice in recent years has proved that polyacrylamide has a good effect on the treatment of coal slime water, can accelerate the sedimentation of coal slime, and is helpful to the production of filter press.
1. Flocculation: PAM can neutralize suspended matter through electricity, bridge adsorption, and play a role in flocculation.
2. Adhesiveness: It can play an adhesive role through mechanical, physical and chemical effects.
3. Resistance reduction: PAM can effectively reduce the frictional resistance of the fluid, adding a small amount of PAM to the water can reduce the resistance by 50-80%.
4. Thickening: PAM has a thickening effect under neutral and acidic conditions. When the pH value is above 10, PAM is easy to hydrolyze. Thickening will be more pronounced in a semi-reticular structure.
1. Quickly form large flocs, large and compact alum flowers, less sludge and fast flocculation and settlement;
2. Dissolve quickly and thoroughly, without insoluble matter (fish eyes); the product in powder state dissolves for about 60 minutes;
3. Economical and practical, small dosage, good effect, high dehydration rate; low operating cost, low dosage can produce effective effect and high dehydration performance, very economical;
4. Excellent filtration and dehydration performance improves the dehydration effect of sludge;
5. Can be fed automatically; easy to handle.
1. Dissolved water quality: It is recommended to use low-hardness water with a neutral pH. If you use water with too much dissolved inorganic matter or metals, if you use groundwater, river water, or recycled water, the performance of the product will easily deteriorate.
2. Dissolving time: The powder product should be stirred and dissolved for at least 1 hour (non-ionic recommended to dissolve for more than 2 hours) in order to exert the best performance and reduce the amount of product.
3. Dissolution concentration: the usual dissolution concentration of cationic flocculants is 2‰ (1‰-3‰ feasible), and the usual dissolution concentration of anionic and non-ionic flocculants is 1‰ (0.5‰-1.5‰ feasible).
