Minben Calcium
Green Development, Shared Future
As a manufacturer of calcium-based materials, Minben Calcium integrates sustainability into day-to-day operations rather than treating it as a standalone initiative. Compliance is fundamental, but operational stability and resource efficiency are equally important.
We implement continuous improvement systems across production control, raw material utilization, energy optimization, and mine land management. While ensuring product quality and supply reliability, we steadily reduce resource intensity and environmental impact.
For Minben Calcium, sustainability is not a short-term project, but a management principle embedded throughout the production process.
Sustainability in Action
From Compliance to Regeneration
Closed-Loop Tailings and Water Management
In 2017, Minben suspended production for five months and invested RMB 120 million to build a tailings solid–liquid separation center. The project enabled internal water recycling and over 95% filter cake reutilization, laying the foundation for long-term environmental management and operational stability.
In 2017, Minben suspended production for five months and invested RMB 120 million (about USD 17.4 million) to construct a tailings solid–liquid separation center. Although the decision temporarily affected capacity, it established a foundation for long-term environmental management and operational stability.
By installing filter press systems, the company implemented a closed-loop water circulation process. Production water is internally recycled, and filter cake reutilization exceeds 95%. In industry terminology, this operating condition is often described as "Zero Liquid Discharge," referring to effective control of wastewater discharge during operation.
The project marked a shift from end-of-pipe treatment to process-based water management.
Limestone Resource Utilization Optimization
Through graded mining and cascade utilization, Minben increased limestone utilization from approximately 85% to 98%. This improvement reduced solid waste by about 320,000 tonnes annually while generating RMB 12 million in additional yearly value.
In mining operations, improving utilization per tonne of extracted ore is a direct method to reduce waste generation. Prior to 2018, limestone utilization stood at approximately 85%.
Through graded mining and cascade utilization strategies, different ore grades were allocated to appropriate production stages, increasing overall utilization to 98%. The improvement reduced solid waste generation by approximately 320,000 tonnes per year.
At the same time, low-grade materials and by-products were recovered for reuse, generating approximately RMB 12 million (about USD 1.8 million) in additional annual value and strengthening internal resource circulation.
Rotary Kiln Energy Efficiency Upgrade
In 2020, Minben upgraded its rotary kiln system with a three-stage preheater and intelligent temperature control. The upgrade improved heat recovery by 22%, reduced natural gas consumption by 15%, and cut annual carbon emissions by approximately 18,000 tonnes.
Energy consumption represents a significant cost and emission factor in lime production. In 2020, Minben implemented an energy-efficiency upgrade of its rotary kiln system, incorporating a three-stage preheater and intelligent temperature control.
The upgrade increased heat recovery efficiency by 22%, reduced natural gas consumption by 15%, and lowered unit energy consumption to 260 kgce per tonne, improving thermal utilization per unit of output.
Based on internal estimates, annual carbon emissions were reduced by approximately 18,000 tonnes, contributing to improved energy management performance.
Dafasi Town Land Reuse and Tea Plantation Project
In 2022, Minben joined a hometown village–enterprise cooperation project to convert underused land into a large-scale tea plantation. By combining corporate investment with local land and labor, the project restored land productivity and supported local employment and income growth.
In Dafasi Town, long-term mining activity and labor migration left significant areas of land unused. Although the region benefits from favorable climate conditions and selenium-rich soil, previous agricultural initiatives did not achieve sustained operations.
In 2022, Minben participated in a land reuse project through a village–enterprise cooperation model. The company provided capital investment and cultivation expertise, while local communities contributed land and labor resources to establish a large-scale tea plantation.
The project restored land productivity, supported local employment and contributed to the income growth, reflecting the company's approach of advancing land rehabilitation alongside resource development.
Distributed Photovoltaic Installation
In 2025, Minben installed a 5,300 kWp distributed photovoltaic system across its mining and plant facilities. The system generates about 5.8 million kWh annually, supplementing production electricity demand and increasing the share of clean energy in daily operations.
To optimize its energy structure, Minben installed a distributed photovoltaic system with a total capacity of 5,300 kWp across mining and plant facilities in 2025.
Operating under a self-consumption with surplus electricity fed to the grid model, the system generates approximately 5.8 million kWh annually, supplementing production electricity demand and reducing reliance on external power supply.
The integration of renewable energy supports a gradual increase in clean energy usage and strengthens long-term energy management.