Anionic Polyacrylamide For Coal Washing

Qingdao Shuodi Environmental Protection Technology Co., Ltd. has been committed to the production of anionic polyacrylamide for coal washing for many years. Anionic polyacrylamide for coal washing 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.

Technical process of anionic polyacrylamide precipitation for coal washing:

A precipitate is a chemical reaction that produces a substance that is insoluble in the solution in which the reactants are contained. The literal understanding is to remove sedimentation under the action of gravity. Suspended matter in sewage can be a physical process, which is simple and effective, and is one of the important technologies for sewage treatment.

According to the nature and concentration of suspended matter and the coagulation performance of polyacrylamide, precipitation can be divided into: natural precipitation, flocculation precipitation, and regional precipitation. The concentration of suspended particles in the sedimentation domain is relatively high (above 5000mg/L), and the settlement of particles is affected by other particles around them, and the relative position between particles remains unchanged, forming a whole to sink together, and there is a clear mud-water interface with the clarified water . Regional sedimentation occurs in both the secondary sedimentation tank and the sludge thickening tank.

Flocculation and sedimentation is the process of flocculation and sedimentation of particulate matter in water. After the coagulant is added to the water, the colloids and dispersed particles of the suspended matter in it form flocs under the interaction of molecular forces, and they collide and coagulate with each other during the sedimentation process, and their size and quality continue to increase, and the sinking speed continues to increase. . The removal rate of suspended solids depends not only on the sedimentation speed, but also on the sedimentation depth. The alum flower formed after adding coagulant in the surface water, the organic suspended matter in domestic sewage, and the activated sludge will all appear flocculation and sedimentation during the sedimentation process.

Use of anionic polyacrylamide for coal washing:

1. The type, size, concentration, pH value and stirring conditions of the suspended matter in the treated sewage (sludge) will affect the treatment effect of the polymer flocculant. On-site debugging or beaker experiments should be carried out according to different conditions to obtain the best conditions of use and determine the best product and dosage;

2. The flocculant must be effectively dispersed and carefully dissolved to avoid the rapid dissolution of the powder surface that causes the particles to adhere to each other, resulting in "fish eyes" that cannot be dissolved inside the particles.

3. Granular powder products are hygroscopic, and the remaining medicine after opening the package should be resealed for storage.

4. The product is usually stored in a plastic-lined paper bag. Under dry and well-ventilated conditions, it is recommended to use the granular powder product within one year, and the longest validity period is two years.

5. The dissolved flocculant has poor storage stability and should be used within 24 hours after dissolving. If the viscosity will decrease after 2-3 days, the function will decrease.

6. A series of experiments have proved the pharmacological inactivity of this product, but we recommend that you wear goggles, work gloves or use other safety devices when using these products for a long time or repeatedly in large quantities to avoid "skin contact", Face and hands should also be washed after each handling.

Storage method of anionic polyacrylamide for coal washing:

Packed in 25Kg plastic-lined woven bags or paper-plastic composite bags, or according to user requirements. When storing and transporting, pay attention to heat protection, moisture protection, and prevent packaging damage. Dry powder products will absorb moisture and agglomerate if left exposed for a long time. Stacking layers shall not exceed 20 layers. The effective storage period is 2 years.

Influence of anionic polyacrylamide for coal washing and product selection:

1. It can be specially used in the state of high viscosity aqueous solution. The solution state is a viscous gel system with good fluidity.

2. It is suitable for water treatment of industrial water supply, urban sewage, chemical wastewater, mines and other industrial fields. It can accelerate the sedimentation speed and improve the dehydration efficiency because the synthetic flocs are easy to filter.

3. It can make the active groups in the aqueous solution react with each other. In the mud and suspension, these active groups have a strong attraction to the surface of the suspended colloid or very fine particles.

4. From the electrolysis of the products it is known that the interaction between them and the solid particles is based on the formation of hydrides leading to destabilization of the particle surface, like non-ionic polymers or electrostatic interaction and charge exchange. Anionic (negatively charged) and cationic (positively charged) products act in the same way.

5. The destabilization and coagulation of a large number of individual particles leads to the formation of large flocs which are easily separated from the suspension. So whether the effect of a product is the most suitable depends mainly on the potential energy acting on the particle surface. This potential energy depends not only on the particle itself, but also on the external environmental conditions such as water ionicity and pH value, electrical conductivity, hardness, surface activity and other characteristics.

6. Selection of the most appropriate product type for a particle can be relatively easily selected by beaker experiments and the like. It is important to carry out these experiments under the specified operating conditions (such as temperature, agitation, dosage of other accelerators) for the initial solid-liquid mixed suspension.

Other uses of anionic polyacrylamide for coal washing:

1) For sludge dehydration, the corresponding model of this product can be selected according to the nature of the sludge, which can effectively dehydrate the sludge before the sludge enters the filter press. The mud cake is thicker, the dehydration efficiency is high, and the moisture content of the mud cake is below 80%.

2) It is used for the treatment of domestic sewage and organic wastewater. This product is positively charged in the compatible or alkaline medium, so that it can flocculate and settle the negatively charged sewage suspended particles in the sewage, and the clarification is very effective. Such as production of grain alcohol wastewater, papermaking wastewater, wastewater from urban sewage treatment plants, beer wastewater, wastewater from monosodium glutamate plants, sugar wastewater, wastewater with high organic content, feed wastewater, textile printing and dyeing wastewater, etc., using cationic polyacrylamide is better than using anion, The effect of non-ionic polyacrylamide or inorganic salts is several times or tens of times higher, because such wastewater is generally negatively charged.

3) It is used as a flocculant for the treatment of tap water with river water as the source of water, with less dosage, good effect and low cost, especially when used in combination with inorganic flocculants, it will become tap water for the treatment of the Yangtze River, the Yellow River and other river basins Plant high-efficiency flocculant.

4) Strengthening agent and other additives for papermaking. Improve the retention rate of fillers, pigments, etc., and the strength of paper.

5) It is used as an economic aid in oilfields, such as clay anti-swelling agent and thickener for oilfield acidification. 6) Used as a textile sizing agent, the performance of the size is stable, the slump is less, the fabric breakage rate is low, and the cloth surface is smooth.