Coal washing wastewater treatment scheme:

Generally, the coal preparation plant adopts the treatment process of "cyclone thickener filter press (slime sedimentation tank)". In general, it is to purchase macromolecular flocculant (polyacrylamide). The contact action of macromolecular flocculant with slime particles or slime colloid neutralizes the electrical property of the slime surface, reduces the surface energy, and makes the slime particles coagulate and precipitate. polypropylene

The molecular weight of amide is generally between one million, and flocculants with different molecular weight shall be selected for coal slurry with different particle size composition. Polyacrylamides can be divided into three types: anionic polyacrylamide, cationic polyacrylamide and non-ionic polyacrylamide. When using polyacrylamide for water treatment, ensure that the type is consistent with the pH value of coal slurry. Anionic polypropylene

Amide is suitable for slightly alkaline slime water, cationic polyacrylamide is suitable for slightly acidic slime water, anionic and cationic polyacrylamide are used together, and the slime water has better flocculation and precipitation effect.

characteristic:

1. Good water solubility, it can also be dissolved in cold water.

2. Adding a small amount of this anionic polyacrylamide product can achieve great flocculation effect. Generally, only 0.01~10ppm (0.01~10g/m3) is added to give full play.

3. The use of anionic polyacrylamide products and inorganic flocculants (polymeric ferric sulfate, polymeric aluminum chloride, ferric salt, etc.) at the same time can show greater effect.

Working principle:

1) Flocculation principle: When PAM is used for flocculation, it is related to the surface properties of the flocculated substances, especially the dynamic potential, viscosity, turbidity and the PH value of the suspension. The dynamic potential of the particle surface is the reason for particle polymerization inhibition. Adding PAM with opposite surface charge can reduce the dynamic potential and coagulate.

2) Adsorption bridging: PAM molecular chain is fixed on the surface of different particles, forming a polymer bridge between particles, so that particles form aggregates and settle.

3) Surface adsorption: various adsorption of polar group particles on PAM molecules.

4) Enhancement: PAM molecular chain and dispersed phase connect the dispersed phase together to form a network through various mechanical, physical and chemical actions.

Scope of application:

1. Used in textile, printing and dyeing industries. Polyacrylamide is used as sizing agent and finishing agent for fabric treatment, as well as a protective layer that can produce a soft, wrinkle proof and mold proof layer. The breaking rate of spinning yarn can be reduced by taking advantage of its strong hygroscopicity. Polyacrylamide as post-treatment agent can prevent static electricity and flame retardancy of fabrics. When used as a printing and dyeing auxiliary, polyacrylamide can make the product adhere fast

It is large, bright and can also be used as a non silicon polymer stabilizer for bleaching.

2. It is mainly used as flocculant: for the suspended particles, the sewage with relatively thick, high concentration, positive charge particles and neutral or alkaline water PH value, the anionic polyacrylamide molecular chain contains a certain amount of polar groups that can adsorb suspended solid particles in water, so that the particles can bridge to form large floccules. Therefore, it accelerates the sedimentation of particles in the suspension, obviously accelerating the solution

And promote filtration. The product is widely used in the treatment of chemical industrial wastewater and waste liquid, and municipal sewage treatment. Water treatment for tap water industry, purification of high turbidity water, sedimentation, coal washing, mineral processing, metallurgy, iron and steel industry, zinc, aluminum processing industry, electronic industry, etc.

3. It is widely used in petroleum industry, oil production, drilling mud, waste mud treatment, water channeling prevention, friction reduction, enhanced oil recovery and tertiary oil recovery.

4. It is used in the paper industry to improve the retention rate of fillers, pigments, etc. To reduce the loss of raw materials and environmental pollution; The second is to improve the strength of the paper (including dry strength and wet strength). In addition, the use of PAM can also improve the tear resistance and porosity of the paper to improve the visual and printing performance. It is also used in food and tea packaging paper.

5. Other industries, food industry, are used for clarification of cane juice and extraction of syrup phosphorus by flotation in the production of cane sugar and beet sugar. Flocculation and clarification industry of enzyme preparation fermentation liquid is also used for the recovery, stable quality and good performance of feed protein. The recovered protein powder has no adverse effect on the improvement of chicken survival rate, weight gain and egg production. Synthetic resin coating, water plugging of civil engineering grouting materials, building materials industry

High cement quality, adhesive for construction industry, joint repair and water blocking agent, soil improvement, electroplating industry, printing and dyeing industry, etc.