In late March, the Ministry of Industry and Information Technology made it clear at the National Conference on Industrial Energy Conservation and Comprehensive Utilization that in the national “Twelfth Five-Year Plan†four major industrial energy conservation and emission reduction targets, the comprehensive utilization target of phosphogypsum should reach approximately 72%. On April 1, the China Petroleum and Chemical Industry Federation announced that the "12th Five-Year Plan" for petrochemical industry energy-saving emission reduction targets proposed that by 2015, the comprehensive utilization of chemical solid waste, disposal rate will reach 90%. The reporter recently interviewed Wang Yiguo, head of the Raw Materials Industry Division of the Yunnan Industry and Technology Commission. He said: “This is for Yunnan Province where the total utilization of phosphogypsum is less than 20% and phosphogypsum emissions account for about one-fifth of the country's total. With great pressure, we must make great efforts to promote the comprehensive utilization of phosphogypsum."
Wang Yiguo said that Yunnan's phosphogypsum emissions will increase by 13 million tons annually. Up to now, the province has accumulated nearly 90 million tons of phosphogypsum. It not only brings great pressure on the environment, but also affects the overall utilization of industrial solid waste in the province. It also directly affects the sustainable development of high-density phosphate and compound fertilizer industries.
It is understood that in order to speed up the comprehensive utilization of phosphogypsum, Yunnan Province has done a lot of useful explorations in recent years, laying a good foundation for large-scale development and utilization. In order to seek the direction and technology for the utilization of phosphogypsum, Yuntianhua Group sent 40 tons of phosphogypsum to Australia RBS, and used the company's gypsum production line to calcine it into products such as stucco plaster, bonded gypsum, floor gypsum, and ceramic mold gypsum. According to the Shanghai Academy of Building Research, the gypsum products fully meet the requirements of the “Radionuclides for Building Materials†standard. Yuntianhua International Yunfeng Branch and Red Phosphorus Branch of Yuntianhua Group each used phosphogypsum for soil improvement in local farmland and nutrient regulators for calcium phosphate products. Yunnan Fuqiang High-tech Materials Co., Ltd. used calcining and dehydration technology to build the first production plant for producing cement retarder using phosphogypsum in Yunnan Province, with an annual production capacity of 300,000 tons.
Wang Yiguo pointed out that the state has stricter constraints on energy-saving and emission-reducing targets. However, there are still many restrictive factors in the comprehensive utilization of phosphogypsum. For example, it is difficult to purify the impurities contained in phosphogypsum, which affects the strength of phosphogypsum products; The production of sulfuric acid co-produced cement has large investment, high cost, and secondary pollution in the production process; the power plant flue gas wet desulfurization by-produced desulfurized gypsum has high purity and has a greater impact on the use of phosphogypsum; industrial policies are not matched, currently , Excluding phosphogypsum to building materials and cement, the amount of incorporation of more than 30% can be exempted from value-added tax, there is no tax-free policy in other areas; the key technology for large-scale consumption of phosphogypsum has yet to be broken. Therefore, he believes that Yunnan Province must take multiple measures and play a good combination. No matter whether it is from the policy or the enterprise level, it must be a breakthrough in order to truly promote the utilization of phosphogypsum.
Enhanced Process Technology Research
Strengthen technical exchanges and cooperation with phosphogypsum development and research institutions at home and abroad, and promote the utilization of phosphogypsum resources through technological innovation. At the same time, encourage and support the production, learning, research and development, and carry out research and development and application of key technologies such as phosphogypsum and sulfuric acid co-production cement. Strengthen the technical research of phosphogypsum impurities purification treatment process, and gradually promote the kiln process phosphoric acid, hydrochloric acid extraction and other new technologies and technologies, control the production of phosphogypsum from the source, in order to slow down the new addition rate of phosphogypsum. Strengthen the development of complete sets of technologies and equipment, strengthen the introduction, digestion, and absorption of advanced and applicable phosphogypsum resource utilization technologies, and form demonstration projects of independent technologies, combined introduction and absorption of complete sets of technologies and equipment. Encourage phosphogypsum production companies to apply advanced and applicable technologies, and create conditions for the improvement of resource utilization of phosphogypsum from the source. In addition, relevant technical standards should be strengthened to provide technical support for the promotion of phosphogypsum resource utilization technology and large-scale production.
Strengthen industrial policy guidance
Make full use of the current policy of comprehensive utilization of phosphogypsum and actively strive for preferential fiscal and taxation policies for phosphogypsum-made cement retarders. Study the reward and punishment mechanism for the utilization of phosphogypsum, and increase the enthusiasm for the utilization of phosphogypsum.
The demonstration projects for the utilization of phosphogypsum resources shall be initiated. Local governments shall provide support in resource allocation and land use, grant subsidies for project construction funds, and strive for state support.
Set up a phosphogypsum emission reduction responsibility system, stop approving the newly-established wet-process phosphoric acid project where the utilization rate of phosphor gypsum is less than the average utilization rate of the province and the design and management plan of the non-standard phosphorus gypsum slag yard, and encourage qualified companies to gradually achieve Phosphorus gypsum storage management, resource utilization and ecological restoration "three simultaneous", and the phosphogypsum emission reduction task into corporate performance assessment index system.
Implement effective supervision and management
Phosphogypsum resource utilization information network platform was gradually established to strengthen the management of phosphogypsum. Focus on the production, discharge, utilization, and storage management and closure of phosphogypsum in relevant companies, regularly announce the status of phosphogypsum emission, storage and resource utilization of related companies; establish an evaluation system for the utilization of phosphogypsum, and focus on the research and construction of phosphogypsum. The evaluation and decision support system for waste residue management, safety assessment, and comprehensive utilization methods and programs will be used to comprehensively evaluate the economical efficiency, rationality and safety of the resource utilization of phosphorus gypsum; and the responsibility system for production shall be implemented to clarify the responsibilities of the enterprises that produce phosphogypsum. Obligations, establish an effective government supervision and management mechanism, and standardize the investment management of phosphorus gypsum resource utilization projects to prevent short-term behavior and other adverse consequences.
Wang Yiguo stated that despite the difficulties and pressures, Yunnan Province will further increase the comprehensive utilization of phosphogypsum, and the Provincial Industry and Information Technology Commission will establish a coordinated operation mechanism with relevant departments, associations, enterprises, research institutes, etc. to study and formulate phosphorus. The policies related to the utilization of gypsum resources will promote the industrialization of the utilization of phosphor gypsum to ensure the realization of the goal of comprehensive utilization of phosphogypsum in the 12th Five-Year Plan period.
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