[Hongjie Water Service] Detailed explanation of methods for treating scale

Classification of scale

The formation of scale is a complex physical and chemical process, and its genesis and composition are relatively complex. According to the composition of scale, scale can be divided into:

2. Iron scale: includes scale mainly composed of iron, including oxide scale, phosphate scale, and silicate scale.

3. Aluminum scale: It is a scale mainly composed of aluminum, such as aluminum silicate scale.

4. Copper scale: It is a scale mainly composed of metallic copper.

According to the formation process of scale, it can be divided into two types: one is the primary scale formed by the direct crystallization of salt impurities on the heating surface; One is the water residue that easily adheres to the heating surface, which generates secondary scale again.

Methods for treating scale

1. Carbonate scale

Ingredients: The main components are carbonates of calcium and magnesium, with calcium carbonate as the main component and a mass fraction often exceeding 50%.

Features: This scale is white, relatively loose, and soluble in acids, especially hydrochloric acid.

Removal methods: acid washing, oak bowl tannin extract method, alkaline boiling.

2. Sulfate scale

Ingredients: The main ingredient is calcium sulfate, which often accounts for over 50% by mass.

Features: This type of scale is sturdy and dense, appearing yellow white in color. It is insoluble in organic acids and can slowly dissolve in hydrochloric acid.

Cleaning method: Hydrochloric acid washing, alkaline washing or alkaline boiling.

3. Silicate scale

Ingredients: The main components are silicate compounds, such as calcium silicate, magnesium silicate, etc.

Features: It has a grayish white appearance and is insoluble in organic acids. It can slowly dissolve in hot hydrochloric acid.

Removal method: alkaline boiling and acid washing.

4. Rust scale

Composition: The main component is iron oxide.

Features: The exterior is brick red, coffee or black, and the interior is gray. It is relatively hard in a dry state and soluble in concentrated or hot hydrochloric acid.

Removal method: hydrochloric acid hot washing, alkaline boiling+EDTA

5. Mud and sand scale

Composition: The main component is mud and sand, often mixed with scale.

Features: The appearance color is similar to the local mud and sand color, and it adheres firmly to the metal.

Removal method: First, boil with alkali to determine whether to continue acid washing based on its surface condition.

More information can be found on the official website of Shenzhen Hongjie Water Technology Co., Ltd. www.execro.com. If you need it, you can call the company's hotline for free at 180 3800 0078, and we will be happy to serve you.