Solid scale inhibitor is a type of powdery or granular water treatment chemical. It is mainly used to inhibit the deposition of inorganic scales such as calcium carbonate, calcium sulfate, and calcium phosphate in water systems. Meanwhile, it has auxiliary functions of dispersing metal ions and delaying equipment corrosion.

The main components of such chemicals include organophosphonates, polycarboxylate polymers, sulfonate copolymers, etc. It features high purity, strong stability, convenient transportation and storage, and flexible dosing. Widely applied in reverse osmosis (RO) systems, circulating cooling water systems, boiler feed water systems, industrial pure water preparation systems and other scenarios, it can effectively extend the service life of membrane modules, heat exchange equipment, and pipelines, and reduce system cleaning frequency and operation and maintenance costs.

Overview of the Core Principle

The scale inhibition and anti-scaling effect of solid scale inhibitor is based on the triple synergistic mechanism of chelation, dispersion, and lattice distortion, as detailed below:
1.Chelation: Active groups such as phosphonic acid groups and carboxyl groups in scale inhibitor molecules can undergo chelation reactions with scaling metal ions such as Ca²⁺, Mg²⁺, and Ba²⁺ in water to form stable water-soluble chelates. This reaction can reduce the concentration of free metal ions in water, preventing them from combining with anions such as carbonate and sulfate to form insoluble salts, thereby inhibiting scale formation from the source.
2.Dispersion: The molecular chains of scale inhibitors have good extensibility and can be adsorbed on the surface of tiny scale crystal nuclei, making their surfaces charged. Due to electrostatic repulsion, the charged crystal nuclei cannot aggregate and grow, maintaining a state of tiny particles suspended in water and being discharged from the system with water flow, thus preventing scale deposition on the surface of equipment.
3.Lattice Distortion: When a small amount of scale crystals start to form, scale inhibitor molecules can insert into the lattice structure of scale crystals, destroying the normal growth law of crystals. This makes it impossible for crystals to form a dense and hard regular structure, and ultimately generates loose and brittle distorted crystals. Such crystals are difficult to adhere to the inner wall of equipment and are easily washed away by water flow.
Some composite solid scale inhibitors also add corrosion inhibition components, which can reduce the corrosion rate of equipment by forming a protective film on the metal surface.

Product Introduction

Solid scale inhibitors can be divided into multiple series according to applicable water systems and functional characteristics, with core parameters and characteristics as follows:
1. Classification by Applicable Water Systems

Special Solid Scale Inhibitor for Reverse Osmosis (RO): Main components include organophosphonates, polymaleic anhydride, and sulfonate copolymers. Core indicators: applicable pH range 2-10, temperature resistance ≤60℃, scale inhibition rate ≥95%. Characteristics: Specifically designed for reverse osmosis membrane systems, free of free chlorine, and will not cause oxidative damage to membrane modules. It can effectively inhibit the deposition of calcium sulfate, calcium carbonate, and silica scale in reverse osmosis systems and is compatible with various spiral wound reverse osmosis membrane elements.
Solid Scale Inhibitor for Circulating Cooling Water Systems: Main components include 1-Hydroxyethylidene-1,1-Diphosphonic Acid (HEDP), Aminotrimethylene Phosphonic Acid (ATMP), and polyacrylic acid. Core indicators: applicable pH range 6-9, temperature resistance ≤100℃, integrated scale inhibition and corrosion inhibition. Characteristics: It has both scale inhibition and corrosion inhibition functions, can inhibit scale deposition and metal corrosion in heat exchangers and cooling tower pipelines, and is suitable for open and closed circulating cooling water systems.
Solid Scale Inhibitor for Boiler Feed Water Systems: Main components include sodium tripolyphosphate, organophosphonates, and polycarboxylic acids. Core indicators: applicable pH range 8-11, temperature resistance ≤300℃, high pressure resistance. Characteristics: Designed for the high-temperature and high-pressure environment of boilers, it can inhibit the formation of calcium-magnesium scale and silicate scale on the heating surface of boilers, prevent boiler tube explosion, and improve heat exchange efficiency.

2. Classification by Functional Characteristics

Single-Type Solid Scale Inhibitor: Only has scale inhibition function, with a single component and strong targeting. Suitable for water systems with simple water quality components.
Composite Solid Scale Inhibitor: Integrates multiple functions such as scale inhibition, dispersion, and corrosion inhibition. No need to compound other chemicals, suitable for industrial water systems with complex water quality.
Environmentally Friendly Solid Scale Inhibitor: Biodegradation rate ≥60%, phosphorus-free or low-phosphorus formula, meeting environmental discharge standards. Suitable for scenarios with strict requirements on effluent indicators.

Selection Reference Table

Model Series	Applicable System	Core Components	Key Indicators	Dosage (mg/L)	Key Selection Parameters	Core Adaptable Working Conditions
RO-GT-01 (RO Special)	Reverse Osmosis/Nanofiltration Systems	Organophosphonate + Sulfonate Copolymer	pH 2-10, Temperature Resistance ≤60℃, Scale Inhibition Rate ≥95%	2-5	Inlet Water Hardness, TDS Value, Membrane Type	RO Systems for Electronic Ultrapure Water and Drinking Water Purification
CC-GT-02 (Circulating Water Special)	Circulating Cooling Water Systems	HEDP + Polyacrylic Acid	pH 6-9, Temperature Resistance ≤100℃, Corrosion Inhibition Rate ≥80%	5-20	Circulating Water Hardness, Concentration Multiple, Heat Exchange Temperature	Circulating Cooling Water Systems in Chemical and Power Industries
BL-GT-03 (Boiler Special)	Low/Medium Pressure Boiler Feed Water	Sodium Tripolyphosphate + Organophosphonate	pH 8-11, Temperature Resistance ≤300℃	10-30	Boiler Pressure, Feed Water Hardness, Alkalinity	Feed Water Systems for Industrial Boilers and Steam Generators
HB-GT-04 (Environmentally Friendly Type)	Municipal Reclaimed Water Reuse, Sewage Treatment Reuse	Polycarboxylate Copolymer	Biodegradation Rate ≥65%, Low Phosphorus	3-15	Environmental Discharge Standards, Inlet Water COD Value	Industrial Water Reuse Systems with High Environmental Requirements

Application Scenarios

With the characteristics of efficient scale inhibition and convenient transportation, solid scale inhibitors are widely used in industrial water treatment and water purification engineering fields:

1. Membrane Separation System Field

Pretreatment of reverse osmosis (RO), nanofiltration (NF), and ultrafiltration (UF) systems. It inhibits scale deposition on the membrane surface, extends the service life of membrane modules by 1-2 years, and reduces membrane replacement costs. Suitable for membrane separation projects such as electronic ultrapure water preparation, seawater desalination, drinking water purification, and reclaimed water reuse.

2. Industrial Circulating Water Field

Circulating cooling water systems in chemical, power, metallurgical, pharmaceutical and other industries. It prevents scaling and corrosion on the inner walls of heat exchangers, cooling towers, and pipelines, improves heat exchange efficiency by 10%-20%, and reduces system energy consumption. Suitable for open circulating water systems (concentration multiple 3-5 times) and closed circulating water systems.

3. Boiler Feed Water Field

Feed water treatment of industrial low/medium pressure boilers, steam generators, and hot water boilers. It inhibits the formation of calcium-magnesium scale and silicate scale on the heating surface of boilers, avoids boiler tube explosion accidents, and ensures the safe and stable operation of boilers. Meanwhile, it reduces boiler blowdown rate and saves water resources.

4. Other Water Purification Fields

Municipal reclaimed water reuse systems, industrial wastewater reuse systems, and central air conditioning cooling water systems. It prevents scaling of pipelines and equipment, improves water resource reuse rate, and meets the requirements of national water conservation and emission reduction policies.

Product Features and Achieved Effects

1. Core Product Features

Feature	Specific Description
Convenient Transportation and Storage	Solid form with small volume and light weight, no leakage risk. Compared with liquid scale inhibitors, transportation costs are reduced by 30%-50%. The shelf life can reach more than 2 years when stored in a sealed manner.
High Purity and Stable Effect	The effective component content of solid chemicals is ≥90%, with few impurities. After dosing, the reaction efficiency is high, and the scale inhibition effect is not affected by storage time.
Flexible and Convenient Dosing	It can be dissolved and continuously dosed by a metering pump, or intermittently dosed according to water quality fluctuations. The dissolution concentration can be adjusted as needed, adapting to water systems of different treatment scales.
Wide Adaptability	Different models are suitable for various water systems such as reverse osmosis, circulating water, and boilers. Formulas can be customized according to water quality to meet personalized needs.
Cost-Effective	High effective component content, the chemical cost per unit of treated water is lower than that of liquid scale inhibitors. It has the functions of scale inhibition, dispersion, and corrosion inhibition, reducing the cost of chemical compounding.

2. Practical Application Effects

Scale Inhibition and Anti-Scaling Effect

The scale inhibition rate for calcium carbonate and calcium sulfate is ≥95%, and for silica scale is ≥80%. It can extend the cleaning cycle of reverse osmosis systems to 6-12 months and the cleaning cycle of heat exchange equipment in circulating water systems to 1-2 years.

Equipment Protection Effect

Reduce the scaling and corrosion rate of membrane modules, heat exchangers, and boiler heating surfaces, extend the service life of equipment by 2-3 years, and reduce equipment maintenance and replacement costs.

Energy Consumption Optimization Effect

The heat exchange efficiency of circulating water systems is increased by 10%-20%, the thermal efficiency of boilers is increased by 5%-10%, and the operating pressure of reverse osmosis systems is reduced by 5%-10%, significantly reducing system energy consumption.

Water Conservation and Emission Reduction Effect

The concentration multiple of circulating water systems is increased to 3-5 times, the boiler blowdown rate is reduced to below 5%, the water resource utilization rate is increased by 15%-30%, helping enterprises achieve water conservation and environmental protection goals.

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