Honzonsi | Shenhua Ningmei Ningdong Mining Area Mine Water and Coal Chemical Wastewater Treatment and Utilization Project
Published Time:
2025-06-27
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I. Project Introduction
1. User Introduction
Owner: National Energy Group Ningxia Coal Industry Co., Ltd.
Project Location: Ningdong Energy and Chemical Industry Base, Ningxia Hui Autonomous Region
2. Project Scale
Mine water treatment: 10,000 m³/d
Coal chemical wastewater treatment: 5,000 m³/d
Concentrated brine evaporation and crystallization system: 450 m³/h (salt crystallization unit)
3. Water Use
Annual recovery of 24.09 million tons of high-quality product water, all reused in coal chemical production to replace fresh water.
4. Awards and Honors
Awarded the national "Benchmark Project for Industrial Water Conservation" and "Green Manufacturing Demonstration Project" titles.
China's first large-scale coal chemical wastewater "zero discharge + salt resource utilization" demonstration project.
Provides a replicable technical route for high-salt wastewater treatment, and has been promoted to similar projects such as Shenhua Baotou and Zhongmei E능화.
II. Technology and Typical Application Scenarios
1. The key technology is evaporation crystallization technology.
The evaporation and crystallization process of this project is undertaken by Hezhongsi (Beijing) Environmental Engineering Co., Ltd. Currently, the salts contained in industrial wastewater are mainly salt and nitrate. According to the different water quality salt-nitrate ratio, and combined with other harmful components in the wastewater, the evaporation crystallization technology is applied in the design of zero-discharge wastewater, such as evaporation and salt precipitation, evaporation and nitrate precipitation, and freezing and nitrate precipitation evaporation systems, to achieve zero-discharge wastewater.
Mechanical Vapor Recompression (MVR) evaporation crystallization is a process that compresses the secondary steam that would normally be condensed with cooling water in the evaporator, increasing its pressure and saturation temperature, and then sending it to the evaporator heater as a heat source to heat the material liquid. The latent heat of the secondary steam is fully utilized, thus achieving energy saving. Freeze crystallization is more suitable for substances with positive solubility and whose solubility changes significantly with temperature, and substances with higher supersaturation and supercooling.
The raw material heat is taken away by the freezing medium, and the heat of the freezing medium is then recycled after heat exchange with the refrigerant of the refrigeration unit. The entire system fully utilizes the temperature difference between the materials entering and leaving the system for heat exchange during the circulation process, ensuring that the heat of the system is maximally recovered and reused, reducing system energy consumption.
2. Main Highlights of the Project
(1) Achieve zero wastewater discharge and improve water resource utilization rate.
The technology effectively treats wastewater, and the effluent quality meets the reclaimed water standard. All of it is reused by local enterprises, with no wastewater discharge, and reduces the amount of fresh industrial water used, saving water resources.
(2) Achieve a circular economy and resource recovery.
Under the goal of wastewater reuse and zero discharge, through precise analysis and effective utilization of the water quality content, high-content substances in the water are developed into resources, ultimately obtaining industrial-grade crystalline salt with certain economic value, reducing solid waste while achieving the recovery of by-product economy. Achieve a circular economy of wastewater and waste.
(3) Clean production, advanced technology, and high degree of automation.
The technology is mature and advanced, using an advanced control management system to control the entire wastewater treatment system, with a high degree of automation, which can significantly improve processing efficiency, avoid human error, reduce labor costs, and improve product quality. The equipment selected for the technology is advanced and energy-saving, achieving clean industrial production.
(4) High thermal efficiency, energy saving, and low operating cost.
Due to the recycling of steam, energy consumption is greatly reduced, greatly reducing the operating cost of enterprises, reducing environmental pollution, and the energy-saving effect is very significant.
(5) Small footprint.
The process design improves energy efficiency, the equipment layout is reasonable, and the efficient process flow greatly reduces the footprint and saves space.
III. Economic and Social Benefits
This coal chemical wastewater treatment project has achieved significant economic and social benefits.
1. Economic Benefits
Annual recovery of 24.09 million tons of product water, saving fresh water costs; by-product production of 39,900 tons/year of sodium chloride and 43,200 tons/year of sodium sulfate, generating revenue from external sales, and reducing solid waste disposal costs. The use of Mechanical Vapor Recompression (MVR) technology significantly reduces energy consumption and comprehensively saves operating costs.
2. Social Benefits
Achieve zero wastewater discharge, reduce environmental pollution; save water by 38.27%, alleviate water resource shortages; resource recycling and utilization are in line with the national green development strategy, providing a sustainable demonstration for the coal chemical industry, and contributing to the achievement of the "dual carbon" goals.
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