The "Technical Specification for Manganese Slag Pollution Control" (hereinafter referred to as "Technical Specification") is expected to be issued in the near future to improve the environmental management system of the manganese industry, promote the green and healthy development of the manganese industry, and ensure the safety of the ecological environment and public health.
The first financial reporter learned from the Ministry of Ecology and Environment that the "Technical Specifications" have been reviewed and approved in principle at the executive meeting of the Ministry on the 15th of this month.
According to the compilation team of "Technical Specifications", my country is the main producer of electrolytic manganese metal, electrolytic manganese dioxide and high-purity manganese sulfate in the world, of which electrolytic manganese production capacity accounts for 97% of the global total production capacity, and the electrolytic manganese industry adds more manganese slag every year. million tons.
According to the introduction of the preparation team, manganese ore in my country is mostly lean ore with an average ore grade of about 12%, and the production of 1 ton of metal manganese produces 8 to 10 tons of manganese slag.
Up to now, the cumulative stock of manganese slag in the country has exceeded 100 million tons.
Manganese slag contains a large amount of soluble salt compounds with complex components, and the improper disposal can easily cause great environmental risks.
At present, manganese slag in my country is mainly disposed of by landfill, which occupies a large amount of land and has high disposal costs.
Located in the junction of Guizhou, Hunan and Chongqing, Songtao County in Guizhou Province, Huayuan County in Hunan Province, and Xiushan County in Chongqing City are connected to the area with the most concentrated manganese reserves in my country, known as the "manganese triangle".
In the past few years, hundreds of enterprises of various scales have been mining and producing here, forming countless piles of manganese slag and other industrial waste.
The mountain of slag is constantly piled high, and the waste water is flowing.
High-level officials have given many instructions on the rectification of the "manganese triangle".
This morning (March 18), when the Central Second Ecological Environmental Protection Inspectorate Group reported the inspection situation to Guizhou Province, it also notified the problems existing in the management of manganese slag pollution.
According to Li Jiaxiang, the leader of the inspection team, the Batang Bay Manganese Slag Centralized Repository Project was put into trial operation before it was completed, resulting in a serious leachate leakage accident.
In order to build the Jiulong Lake municipal landscape project, Songtao County forcibly stored water without relocating the Xiaohe manganese slag silo as required, and a large amount of leachate infiltrated the lake. Filtrate collection facility for landscape construction, further aggravating pollution.
On July 16, 2021, the Central Sixth Ecological Environmental Protection Inspection Team pointed out when feeding back the inspection situation to Hunan Province that Huayuan County, Xiangxi Prefecture belongs to the "Manganese Triangle" area, and the disposal of manganese slag left over from history is not effective. The treatment project is not running normally, the reconstruction and expansion projects of the sewage treatment plants in Minle Town, Maoer Township, and Paiwu Township manganese mining areas are lagging behind, and some manganese-containing sewage is discharged into the external environment; some areas and industrial and mining sites are seriously polluted by heavy metals, and heavy tailings ponds are involved. , There are many abandoned mines.
Some historical legacy-related heavy waste slag treatment progress is slow.
According to the compilation team of "Technical Specifications", there are industrial-scale high-temperature treatment production lines of manganese slag in China, and the treated manganese slag is used as cement raw material to produce cement.
In this regard, the "Technical Specifications" clarifies the requirements for the leaching concentration of heavy metals in manganese slag, as well as the requirements for pollution control in the production process.
In addition, manganese slag filling and backfilling will also pose risks to the ecological environment and human health. The "Technical Specifications" require that manganese slag must be treated before it can be landfilled. Before filling and backfilling, an environmental background investigation and an environmental risk assessment should be carried out.
After backfilling, land reclamation shall be implemented immediately in accordance with relevant regulations.
The first financial reporter learned from the Ministry of Ecology and Environment that in recent years, relevant state departments have issued corresponding guidance and support policies for the disposal of manganese slag.
The "Opinions of the State Council on Supporting Guizhou's Development of the Western Regions in the New Era" also clarifies that special treatment of phosphorus, manganese, red mud, and coal gangue pollution will be implemented, and phosphogypsum, manganese slag and other harmless resource utilization technologies will be promoted. and engineering application demonstration.
The relevant person in charge of the Guizhou Provincial Department of Ecology and Environment said that the scientific and technological research on the comprehensive utilization of manganese slag is being accelerated, and the technological research and engineering application research on the reduction, harmlessness and resource utilization of manganese slag is being carried out, so as to improve the comprehensive utilization level of manganese slag.
Dong Xiongwen, senior engineer of Guizhou Dalong Huicheng New Materials Co., Ltd. suggested to formulate an incentive policy for the use of manganese slag comprehensive utilization products.
In terms of land, electricity price, examination and approval, talent attraction, tax reduction and exemption, etc., we will speed up the formulation of investment promotion and business stabilization policies for the manganese industry, improve the infrastructure construction of the park, and increase the attractiveness of investment promotion.
Develop the industrial chain of "manganese ore - manganese alloy - steel", "manganese ore - manganese salt - manganese battery material - battery - new energy vehicle - recycling".