Polyferric chloride (PAFC) is an inorganic polymer coagulant water purification material based on the coagulation and hydrolysis mechanism of aluminum salt and iron salt. According to the principle of synergistic action, it is a new and efficient coagulant which is composed of simple iron ions or iron oxides and other iron-containing compounds. It combines the advantages of aluminum salt and iron salt, obviously improves the morphology of aluminum ion and iron ion, and greatly improves the degree of polymerization. Polyaluminum and iron coagulants have their own advantages in air flotation operation, which improves the coagulation performance of polyaluminum chloride. The purification effect of high turbidity water and low temperature and low turbidity water is particularly obvious, and alkaline additives or other coagulant AIDS are not needed.
Application of polymeric ferrous sulfate: For example, when treating rare earth industrial wastewater with polymeric ferric sulfate, the device keeps the tiny solid particles of wastewater at a certain distance from the surface of high concentration ion membrane, which greatly reduces the chance of harmful substances and avoids polluting the membrane surface, and polymeric ferric sulfate improves the excessive circulation of water; The process not only separated and enriched high-concentration ammonium chloride from the wastewater of rare earth extraction process, but also recycled the wastewater after reaching the standard of rare earth industry. Hydrochloric acid and ammonia reactor and polymeric ferric sulfate were successfully recovered by electrolysis process and solar energy, which reduced the recovery of raw materials in rare earth industry and recovered energy by using fuel cells. By the way, the cost of treating a large amount of wastewater is 40 yuan, that is, 1.600 tons/day. Including 100g/L ammonium chloride. Through this process, the first generation hydrochloric acid and ammonia water can achieve a profit of 1 10000 yuan, which not only reduces, stabilizes and harmlessly treats the sewage in this country; Strictly control the contents of heavy metals and toxic polyferric sulfate harmful substances in rare earth industrial wastewater; On the premise of safety, environmental protection and economic recovery, the energy and resources of wastewater and PFS waste gas are utilized to achieve the purposes of wastewater and waste gas treatment and comprehensive utilization, energy saving and emission reduction, and circular economy development.
Polyferric sulfate (PFS) uses the combination of dielectrophoresis technology and osmotic membrane separation technology to reuse sewage, which realizes the technological innovation and scientific progress of sewage treatment, gives full play to the investment and operation efficiency of equipment, and is suitable for China's national conditions and conforms to the new technologies of sewage treatment, PFS and new equipment in Inner Mongolia. If the new technology is widely used, it will improve the level of industrial wastewater treatment and disposal of mining enterprises in this area, PFS will further protect and improve the ecological environment and promote the sustainable development of economy, society and environment in this area.
aluminum sulfate
Chemical properties: extremely soluble in water, aluminum sulfate is insoluble in pure sulfuric acid (only in sulfuric acid), but soluble in water with sulfuric acid, so the solubility of aluminum sulfate in sulfuric acid is the solubility of aluminum sulfate in water.
Crystalline water containing 18 molecules is precipitated at room temperature, which is 18 aluminum sulfate hydrate, and most of the industrial production is 18 aluminum sulfate hydrate. Containing 5 1.3% anhydrous aluminum sulfate, it will not autodissolve (dissolve in its own crystal water) even at 100℃.
Not easy to weather, not easy to lose crystal water, relatively stable. It loses water when heated, and decomposes into alumina and sulfur oxides at high temperature. [4] When heated to 770℃, it begins to decompose into alumina, sulfur trioxide, sulfur dioxide and steam. Soluble in water, acid and alkali, insoluble in ethanol. The aqueous solution is acidic. After hydrolysis, aluminum hydroxide is produced. Basic aluminum sulfate can be produced when the aqueous solution boils for a long time. Industrial products are gray-white flakes, granules or blocks, which are light green because of containing low iron salts, and the surface is yellow because of oxidation of low iron salts. The coarse product is a gray-white porous material with fine grain structure. Non-toxic, dust will irritate eyes.
Function: 1. Used as paper sizing agent in paper industry to enhance the water resistance and impermeability of paper; 2. When dissolved in water, fine particles and natural colloidal particles in water can condense into large flocs, which can be removed from water, so they are used as coagulants for water supply and wastewater; 3. Used as turbid water purifying agent, precipitant, color fixing agent, filler, etc. Used as an antiperspirant cosmetic raw material (astringent) in cosmetics; 4. In the fire fighting industry, foam extinguishing agent consists of baking soda and foaming agent; 5. Analytical reagents, mordants, tanning agents, oil decolorants and wood preservatives; 6. Stabilizer for pasteurization of albumin (including liquid or frozen whole egg, protein or yolk); 7. It can be used as raw materials for manufacturing artificial gem and high-grade ammonium alum and other aluminates; 8. In the fuel industry, it is used as a precipitant in the production of chrome yellow and lake dyes, and also plays the role of color fixation and filler.
Efficient composite water purifying agent
The inorganic components and organic components in the water purifier are combined by valence bonds, and the stability is good. It can not only remove colloidal particles (such as turbidity, organic matter, bacteria, viruses, etc. ), phosphorus, fluorine, arsenic, etc. In water, it can also efficiently remove soluble pollutants with molecular weight less than 500 (such as diclofenac, nifuroxime axetil, PFOA, etc.). ) is difficult to remove by traditional flocculants. The optimal dosage range of water purifying agent is wide, and the effect of turbidity removal and decoloration is good. It can be widely used in water purification, turbidity removal, decoloration, solid-liquid separation and other processes in wastewater treatment, especially for high-concentration sewage (wastewater).
Mechanism of action
The mechanism of high-efficiency composite water purifier is a complex physical and chemical process, and its mechanism is that particles condense into large flocs through adsorption, electric neutralization and bridging adsorption, which accelerates the sedimentation of particles in suspended solids. Inorganic polymer flocculant has strong electric neutralization ability, which is beneficial to adsorb charged particles in water and make them condense into large particles, while the long-chain characteristics of organic polymer flocculant are beneficial to bridge the adsorbed colloidal particles and realize particle reunion. The high-efficiency composite water purifier combines the characteristics of inorganic polymer flocculant and organic polymer flocculant, which makes it have the characteristics of both inorganic and organic polymer flocculant, thus greatly improving the flocculation ability and having fast and efficient flocculation effect.