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Agricultural green circulation is an important measure to promote agricultural green development through green circulation in the entire agricultural industry chain and an indispensable link to achieve agricultural green development in the entire economic system. It is of great significance to explore the internal dynamic mechanisms of agricultural green circulation from the perspective of the industrial chain. In the mechanism of agricultural green circulation, the dual role of farmers in the circulation of agricultural products and information transmission effectively connects the government and consumers. The three parties restrict each other and promote the realization of the goal of maximizing their respective interests at the same time. In the tripartite game model of government, farmers, and consumers, the differences of game environment and participants' own situation tend to have an impact on the equilibrium result of the game. By deducing and comparing the equilibrium results of tripartite game models under different game environments, this study finds that: 1 The promotion cost of the government is the fundamental factor that determines its competitiveness in the sales of agricultural products. Local governments with promotion cost advantages tend to be more dominant in any game environment. 2 The absolute cost of farmers is irrelevant, and its relative cost affects the game result by changing the farmers' concerns about the matching state of agricultural products. 3 Asymmetric subsidy information can benefit farmers, but it will not change farmers' concern about the matching state of agricultural products, which is not conducive to consumers and local governments with inferior promotion costs. Local governments should fully consider the promotion cost, subsidy cost, and market effect, and comprehensively promote the development of agricultural green circulation by improving management efficiency, governance ability, and public opinion guidance. [ABSTRACT FROM AUTHOR]

Arsenic is a harmful element in a silver-lead-zinc polymetallic ore in Yunnan. The occurrence state of arsenic and its effect on beneficiation are quickly and accurately identified by means of optical microscope and automated mineral analyzer such as AMICS. The results show that the arsenic content is 0.53%, and the arsenic is mainly distributed in arsenopyrite, followed by pyrite, partly distributed in realgar and gratonite. However, the main factor leading to the high arsenic content of silver-lead concentrate is that realgar and gratonite, followed by arsenopyrite. In order to reduce the arsenic content, the depression of realgar and arsenopyrite should be strengthened. Gratonite and galena are closely related and have similar chemical properties, and they are difficult to be effectively separated, so the arsenic content in silver-lead concentrate can hardly be reduced to less than 0.77%. The main factor leading to the high arsenic content of sulfur concentrate is arsenopyrite and arsenic-bearing pyrite. Even if pyrite and arsenopyrite are separated effectively, the arsenic content can hardly be reduced to less than 0.22%. For zinc concentrate, sphalerite is relatively easy to separate from arsenopyrite and pyrite, so the arsenic content is easy to reach the standard. The research results provide a theoretical basis for arsenic reduction process of the arsenic-bearing Ag-Pb-Zn polymetallic deposit in Yunnan. [ABSTRACT FROM AUTHOR]