1. Corrosion Background of Mining Equipment

Corrosion refers to the damage or deterioration of mining equipment caused by the surrounding environment. Broadly, corrosion includes all forms of material degradation beyond simple mechanical damage, and the objects of corrosion encompass various materials. Conventionally, "corrosion" is used to describe the degradation of metallic materials, while the corrosion of non-metallic materials has a separate term. Mining equipment corrosion generally refers to the damage or deterioration of equipment materials caused by the chemical or electrochemical effects of the surrounding medium, or by the combined action of mechanical, biological, and other factors.

At high temperatures, or in dry atmospheres, corrosion occurs when the surface of mining equipment directly reacts with acidic gases such as oxygen, chlorine, hydrogen sulfide, sulfur dioxide, or with other non-dissolving substances. The chemical reactions lead to the corrosion of the metal, which is referred to as "chemical corrosion." In humid atmospheres, or in water and other dissolving solutions, due to the non-homogeneity of the metal composition and structure of mining equipment surfaces, or due to differences in medium concentration, temperature, and other factors, many tiny chemical cells are formed on the metal surface. The action of these cells leads to electrochemical reactions that result in metal corrosion, which is called "electrochemical corrosion."

I. Reference Standards

Current national standards, relevant regulations, and mandatory standard provisions;

"Code for Construction and Acceptance of Building Anti-corrosion Engineering" (GB50212-2002)

"Standard for Corrosion and Rust Removal Levels of Steel Surface Before Coating" (GB8923-1988)

"Safety Regulations for Coating Operations and Safety Management Rules" (GB6514-1995)

"Quality Requirements for Anti-corrosion Coatings" (GB6514-1991)

"Safety Regulations for Coating Operations, Paint Process Safety, and Ventilation Purification" (DJ/T6931-1999)

"Code for Construction and Acceptance of Industrial Equipment and Pipeline Anti-corrosion Engineering" (HGJ229-91)

"Safety Regulations for Coating Operations and Safety of Surface Preparation Process" (GB7692-87)

"Noise Limits at Construction Sites" (GB12523-90)

ISO9001 Quality Management System Documents

ISO14001 Environmental Management System Documents

GB/T28001 Occupational Health and Safety Management System Documents

I. Design Basis

Environmental Conditions: The corrosion level of atmospheric environments on steel structures can be determined according to Table 1.

1. Conveyor Belt Anti-Corrosion Repair Program

Conveyor belts are widely used in coal mining enterprises due to their advantages such as speed, high efficiency, and energy saving. However, due to various factors such as water spraying during underground operations, high acidity and alkalinity of the water, wear of the belts, and corrosion, the conveyor system may fail to operate normally. As corrosion has become quite severe, Mengneng Technology has analyzed the causes of corrosion and proposed corresponding anti-corrosion solutions for the conveyor belt system.

Table 1: Anti-Corrosion Program for Conveyor Belt Using Graphene Coating Technology

1. Anti-Corrosion Coating Scheme for Bucket Wheel Excavator

The bucket wheel excavator operates in two ways: stacking and reclaiming materials. The bulk materials brought by the belt conveyor are unloaded from the rear car onto the conveyor on the boom, and then discharged to the stockyard from the front of the boom. The operation of the machine, along with the rotation and tilting of the boom, allows the material pile to form a regular trapezoidal shape. In recent years, with the development of technology, many high-quality machines have appeared and been widely used, including the bucket wheel excavator. However, during its operation, corrosion problems have arisen, which seriously interfere with its performance.

Table 1: Use of Graphene Coating Technology for Bucket Wheel Excavator

The mining crusher, also known as the mining crusher equipment, is a category of crushing equipment widely used in mining, metallurgy, building materials, highways, railways, water conservancy, chemical industries, and other departments. Mining crushers are important equipment in the mining production process. The price of crushing equipment is often very expensive, so many customers are eager to know how to extend the service life of the coarse crushing crusher and maximize the production benefits of enterprises. It is well known that mining crushers are subjected to collisions, friction, and corrosion from materials such as ores during operation, causing rapid wear of the main components and shortening their service life, which also affects production efficiency.

Table 1: Use of Graphene Coating Technology for Crushers

Mineral beneficiation is the process of selecting useful minerals from the collected mineral raw materials based on differences in the physical properties, physico-chemical properties, and chemical properties of various minerals. The machinery used to implement this process is called beneficiation machinery. During the beneficiation process, machinery and equipment inevitably face severe corrosion failure issues.

Table 1: Beneficiation Machine Using Graphene Coating Technology

A dust collector is a device that separates dust from flue gas. The performance of a dust collector is expressed by the amount of gas it can handle, the resistance loss when gas passes through the collector, and the dust collection efficiency. Corrosion is one of the common causes of damage to dust collectors, as flue gas contains many corrosive substances, and the corrosion effect is more significant in high-temperature environments, leading to damage to the dust collector. The main causes of corrosion are hydrolysis, oxidation, and acid-base corrosion. The primary causes of damage are hydrolysis and oxidation, while acid corrosion is less common, and alkaline corrosion is even rarer.

Table 1: Normal Temperature Dust Collector with Graphene Technology

Table 2: Bag Dust Collector with High-Temperature Resistant Silicon Technology