The flame retardant is a specialized fire‑prevention and extinguishing chemical agent for underground coal mines and surface coal storage yards, featuring triple functions of oxygen isolation and film formation, heat absorption and temperature reduction, and chemical inertization. It complies with the MT/T 700‑2019 standard and is reliably supplied by Weifang Jiangchang Chemical.

Flame Retardant

Product Overview

Flame retardants are chemical agents specially designed for fire prevention and extinguishing in underground coal mines, serving as a core preventive material to ensure safe mine operations. By spraying or injecting the solution onto the coal surface, they achieve threefold effects: oxygen isolation to form a protective film, heat absorption to lower temperatures, and chemical inertization. These measures effectively prevent coal oxidation and spontaneous combustion, comprehensively addressing self-ignition control needs across multiple areas such as goaf zones, upper and lower corner areas, and floating coal behind supports. They are also suitable for preventing spontaneous combustion at above-ground coal storage yards. The product strictly complies with the “General Technical Conditions for Flame Retardants Used in Coal Mine Fire Prevention” (MT/T 700-2019), offering multiple advantages including safety, environmental friendliness, high flame-retardant efficiency, and low dosage. Manufactured and supplied by Weifang Jiangchang Chemical, a company with many years of experience in the chemical industry, it delivers reliable quality and stable supply.

Technical Principle

The mechanism of flame retardants achieves coal self-ignition prevention through three core aspects: First, oxygen isolation via film formation—when the flame-retardant solution is sprayed or injected into coal pores and fractures, it absorbs moisture from the air and forms a stable hydrated liquid film on the coal surface, directly blocking contact between coal and oxygen and significantly slowing down oxidation; second, heat absorption and cooling—the evaporation of the flame-retardant solution absorbs heat generated during coal oxidation, preventing heat accumulation and making it difficult for the coal to reach its auto-ignition temperature; finally, chemical inertization—flame-retardant molecules bond with coal molecules to form relatively stable compounds, reducing free radicals involved in coal-oxygen reactions and prolonging the low-temperature oxidation process, thereby fundamentally inhibiting conditions conducive to spontaneous combustion.

Product Types and Industry Standards

Based on different flame-retardant mechanisms, flame retardants can be categorized into four main types: physical flame retardants, such as MgCl₂ and CaCl₂ salts, which achieve oxygen isolation and cooling through physical action; chemical flame retardants, i.e., antioxidant agents that chemically inertize coal activity; composite flame retardants, combining physical and chemical effects to enhance preventive performance; and biological flame retardants, utilizing bio-based formulations for environmentally friendly protection. All flame retardants must adhere to the “General Technical Conditions for Flame Retardants Used in Coal Mine Fire Prevention” (MT/T 700-2019), a standard overseen by the National Mine Safety Administration and managed by the Coal Industry Coal Mine Safety Standardization Technical Committee. This standard clearly defines indicators such as flame-retardant rate, service life, corrosion rate, and safety/environmental considerations, applying to underground coal seams and above-ground stored coal in coal mines, except for high-sulfur coal.

Key Performance Parameters

1. Flame-Retardant Rate: According to MT/T 700-2019, the flame-retardant rate for lignite and bituminous coal should be no less than 40%. In practical applications, MgCl₂ demonstrates an average flame-retardant efficiency of 63.6% for gas coal, while CaCl₂ achieves an average efficiency of 47.6% for long-bituminous coal. Antioxidant chemical flame retardants typically offer 50% to 80% efficiency, and composite flame retardants can reduce coal’s spontaneous oxidation rate by 60% to 90% through synergistic effects.
2. Service Life: The standard mandates a minimum service life of 200 minutes for lignite and bituminous coal. Laboratory tests have extended this indicator from 30 days to 45 days, meeting the long-term preventive needs of coal mining cycles.
3. Corrosion Rate Control: The standard stipulates that the corrosion rate of flame retardants on plain carbon steel should not exceed 3 mg/(d·20 cm²). In practice, corrosion rates can be tightly maintained within allowable limits by adding corrosion inhibitors, thus avoiding damage to underground equipment.
4. Safety and Environmental Indicators: Arsenic content in flame retardants should be no more than 0.3 mg/kg, heavy metal content (expressed as lead) no more than 2.0 mg/kg, with no irritating odors and no corrosive harm to humans, fully complying with environmental requirements for safe coal mine production.
5. Usage Concentration and Dosage: Salt-based flame-retardant solutions should ideally maintain concentrations between 15% and 20%, with a minimum of 10%; the recommended liquid volume per ton of coal ranges from 0.04 m³ to 0.06 m³, with water dilution ratios of 40 to 100 times ensuring effective flame-retardant performance.

Core Advantages and Selling Points

1. High Flame-Retardant Efficiency and Remarkable Fire-Protection Effect: Flame retardants can effectively penetrate coal layers and microscopic cracks, forming a stable antioxidant liquid barrier on the coal surface that fully encapsulates coal particles and isolates oxygen. When combined with comprehensive fire-prevention and extinguishing plans, the oxygen volume fraction in goaf areas can be controlled at 6% to 9%, extending the natural ignition period by approximately 42 days and greatly enhancing the mine’s ability to prevent spontaneous combustion.
2. Safe and Environmentally Friendly, No Corrosion or Pollution: The product appears as a white powder, non-toxic, odorless, and pollution-free, causing minimal corrosion to equipment. It strictly meets MT/T 700-2019 standards regarding heavy metal and arsenic content, posing no harm to humans and having little environmental impact, fully satisfying coal mine safety and environmental regulations.
3. Low Dosage, Great Results, Reducing Labor Intensity: Using the flame retardant diluted 40 to 100 times yields excellent results, significantly reducing material usage compared to previous colloidal flame-retardant materials. Underground fire-extinguishing material transport volumes decrease by more than tenfold, effectively lowering miners’ labor intensity while cutting material and labor costs.
4. Solid Technical Credentials and Stable, Reliable Supply: Manufacturer Weifang Jiangchang Chemical was established on January 9, 2015, with a registered capital of 16.5 million yuan, occupying over 8,000 square meters, employing more than 120 staff, and maintaining ample inventory to ensure continuous, stable product supply. The company holds numerous utility model patents, including anti-clogging granulators and easy-to-clean dryers, along with two software copyrights. It has been recognized as a national-level technology-based small and medium-sized enterprise (2025), participating in 46 bidding projects (winning 22), boasting rich production experience and strong technical capabilities, providing solid assurance for product quality and supply.

Core Functions

1. Oxygen Isolation and Flame Retardancy: Forms a stable hydrated liquid film on the coal surface, directly blocking contact between coal and oxygen, thereby stopping coal oxidation and spontaneous combustion at the source.
2. Heat Absorption and Cooling: As the flame-retardant solution evaporates, it absorbs heat generated during coal oxidation, preventing heat buildup and keeping the coal temperature consistently below the auto-ignition threshold, thus averting spontaneous combustion risks.
3. Chemical Inertization: Flame-retardant molecules bond with coal molecules to form relatively stable compounds, reducing free radicals involved in coal-oxygen reactions and prolonging the low-temperature oxidation process, thereby decreasing the likelihood of spontaneous combustion.
4. Anti-Corrosion and Safety Features: Complies with strict national standards regarding corrosion rates, arsenic content, and heavy metal levels, minimizing corrosion to underground equipment and ensuring no harm to workers, making the usage process safe and reliable.
5. Long-Term Moisture Retention: Inorganic salt-based flame retardants possess strong hydrophilicity, maintaining prolonged moisture after spraying or injection into coal, extending the duration of flame-retardant effectiveness and reducing the frequency of repeated operations.

Target Customer Groups

1. Coal Mining Enterprises: The fire prevention and extinguishing management departments of underground coal mines, responsible for regularly spraying flame retardants in goaf areas, upper and lower corners, floating coal behind supports, broken coal pillars along roadways, cut-off eyes, and stop-mining lines—these operational units constitute the primary user group for mining flame retardants.
2. Coal Mine Safety Technology Service Providers: Companies offering design services for fire prevention and extinguishing strategies, flame-retardant spraying construction, and maintenance of fire suppression systems require high-quality flame-retardant products to support their service implementation.
3. Coal Mine Equipment Suppliers: Integrators providing equipment such as flame-retardant mist fire suppression systems and pipe monitoring systems can combine mining flame retardants with their devices to deliver integrated fire prevention solutions to customers.
4. Open-Pit Coal Mines and Coal Storage/Transportation Enterprises: Operators managing open-air coal stockpiles and coal yard fire prevention need to use mining flame retardants for routine fire protection in outdoor coal stacking areas, mitigating risks of spontaneous combustion caused by high temperatures or prolonged storage.

Typical Application Scenarios

1. Spontaneous Combustion Prevention in Goaf Areas: Goaf areas are hotspots for residual coal spontaneous combustion. By injecting mining flame retardants into goaf areas via buried pipes or boreholes, combined with nitrogen-injection inertization and continuous pipe monitoring technologies, a closed-loop fire prevention system of “monitoring–early warning–response” can be established. Industry practice shows that this comprehensive approach can keep the oxygen volume fraction in goaf areas at 6% to 9%, extending the natural ignition period by about 42 days.
2. Spraying in Upper and Lower Corners and Floating Coal Behind Supports: The upper and lower corners of fully mechanized working faces, along with floating coal behind support structures, are key areas prone to spontaneous combustion. Manual or mechanical spraying of mining flame-retardant solutions effectively suppresses floating coal oxidation and promptly eliminates early signs of self-ignition.
3. Protection of Broken Coal Pillars Along Roadways and Cut-Off Eyes: Coal fractures along roadways and cut-off eye areas are well-exposed to oxygen, making them susceptible to oxidation and spontaneous combustion. Regular injection or spraying of mining flame retardants provides preventive treatment, blocking oxidation reaction pathways.
4. Surface Treatment of Stop-Mining Lines: During face stoppage periods, coal exposed in stop-mining line areas faces prolonged oxidation risks. Spraying mining flame retardants to create an oxygen-isolating protective layer extends the coal’s natural ignition cycle, ensuring mine safety during stoppages.
5. Preventing Spontaneous Combustion in Above-Ground Coal Yards: Ground-level coal storage yards and coal transportation transfer stations—open-air coal stacking areas—are vulnerable to spontaneous combustion under summer heat or prolonged storage conditions. Regular spraying of mining flame-retardant solutions effectively lowers coal temperatures, isolates oxygen, and prevents accidental fires.

Solving Core Industry Pain Points

1. Coal Spontaneous Combustion Threatens Mine Safety: Coal spontaneous combustion is one of the major disasters facing mines, endangering miners’ lives while causing losses in coal resources and damage to underground equipment. Mining flame retardants, through triple mechanisms of oxygen isolation via film formation, heat absorption and cooling, and chemical inertization, effectively inhibit coal self-ignition processes, extending the natural ignition period by approximately 42 days and fundamentally reducing spontaneous combustion risks.
2. Traditional Fire Prevention Measures Lack Lasting Effect: Single nitrogen injection or leak-sealing approaches often prove short-lived, failing to meet the long-term preventive needs of coal mining cycles. Mining flame retardants boast a service life of no less than 200 minutes, maintaining prolonged moisture and oxygen isolation on the coal surface after application, continuously delivering flame-retardant benefits.
3. Lack of Standardized Guidance in Choosing Flame Retardants: Different coal types require tailored flame-retardant types, but the absence of unified standards previously made selection challenging. MT/T 700-2019 clearly specifies indicators such as flame-retardant rate, service life, corrosion rate, arsenic content, and heavy metal levels, providing customers with clear selection criteria. Research indicates that 30% halide salts or 20% sodium chloride demonstrate the best overall flame-retardant performance among similar agents.
4. Flame Retardants Corrode Equipment: Traditional flame retardants severely corrode underground pipelines and metal equipment, increasing maintenance costs and safety hazards. MT/T 700-2019 requires that the corrosion rate of flame retardants on plain carbon steel not exceed 3 mg/(d·20 cm²). Leveraging extensive chemical production experience, Weifang Jiangchang Chemical ensures that its products meet these standards while rigorously controlling corrosion rates, further mitigating risks through additional corrosion inhibitors in actual applications.

Core Value

1. Compliance-Based Safety Assurance: The mining flame retardants supplied by Weifang Jiangchang Chemical fully comply with MT/T 700-2019 standards, featuring a flame-retardant rate of no less than 40%, a service life of no less than 200 minutes, a corrosion rate on plain carbon steel not exceeding 3 mg/(d·20 cm²), arsenic content no higher than 0.3 mg/kg, and heavy metal content no greater than 2.0 mg/kg. These attributes provide compliant, reliable preventive materials for coal mine safety, avoiding safety risks and regulatory issues arising from non-compliant products.
2. Efficient Prevention and Cost Reduction: With outstanding flame-retardant efficiency—MgCl₂ achieving an average flame-retardant efficiency of 63.6% for gas coal and CaCl₂ reaching 47.6% for long-bituminous coal—combined with comprehensive fire prevention plans, the oxygen volume fraction in goaf areas can be kept at 6% to 9%, extending the natural ignition period by about 42 days. Meanwhile, the product can be used diluted 40 to 100 times, reducing underground fire-extinguishing material transport volumes by more than tenfold, substantially cutting material, labor, and transportation costs associated with mine fire prevention.
3. Stable Supply Support: Weifang Jiangchang boasts ample inventory, a professional production team, and a well-established supply chain. Located in the Weifang Coastal Economic and Technological Development Zone, the region enjoys abundant saline resources and convenient transportation, giving clear advantages in raw material procurement and logistics distribution. This ensures timely, stable product supply, preventing disruptions to mine fire prevention operations due to material shortages.
4. Backed by Strong Technical Expertise: The company holds multiple utility model patents and software copyrights, has been recognized as a national-level technology-based small and medium-sized enterprise, and has participated in 46 bidding projects, winning 22. Its mature production technology guarantees batch-to-batch stability, providing long-term, reliable fire prevention material support for coal mining enterprises.

Frequently Asked Questions (FAQ)

Q1: Are mining flame retardants suitable for all types of coal?
A: The product adheres to MT/T 700-2019 standards and applies to underground coal seams and above-ground stored coal in coal mines, excluding high-sulfur coal. Different coal types can match corresponding flame-retardant types—for example, gas coal may use MgCl₂-based physical flame retardants, while long-bituminous coal can opt for CaCl₂-based agents.
Q2: How do I determine the appropriate concentration and dosage of mining flame retardants?
A: Salt-based flame-retardant solutions should ideally maintain concentrations between 15% and 20%, with a minimum of 10%. The recommended liquid volume per ton of coal ranges from 0.04 m³ to 0.06 m³, adjustable according to coal type, self-ignition risk level, and other factors. Dilution ratios of 40 to 100 times generally yield good results.
Q3: Do mining flame retardants pose any harm to underground equipment or human health?
A: The product strictly complies with MT/T 700-2019 safety and environmental requirements, with a corrosion rate on plain carbon steel not exceeding 3 mg/(d·20 cm²), arsenic and heavy metal contents within safe limits, and being non-toxic and odorless, causing no corrosive harm to humans. The usage process is safe and reliable.
Q4: How long does the flame-retardant effect last?
A: The standard mandates a minimum service life of 200 minutes for lignite and bituminous coal. Laboratory tests have already extended this to 45 days, and regular re-spraying can sustain long-term preventive effects, meeting the fire prevention needs of coal mining cycles.