A cleaner production strategy for acid mine drainage prevention of waste rock:A porphyry copper case

An in-process technology approach is proposed to identify the source of acid mine drainage(AMD)generation and prevent its formation in a porphyry copper waste rock(WR).Adopting actions before stockpiling the WR enables the establishment of potential contaminants and predicts the more convenient method for AMD prevention.A WR sample was separated into size fractions,and the WR’s net acidgenerating potential was quantified using chemical and mineralogical characterization.The diameter of physical locking of sulfides(DPLS)was determined,and the fractions below the DPLS were desulfurized using flotation.Finally,the WR fractions and tailing from the flotation test were submitted to acid-base accounting and weathering tests to evaluate their acid-generating potential.Results show that the WR’s main sulfide mineral is pyrite,and the DPLS was defined as 850μm.A sulfide recovery of 91%was achieved using a combination of HydroFloat^(®)and Denver cells for a size fraction lower than DPLS.No grinding was conducted.The results show that size fractions greater than DPLS and the desulfurized WR are unlikely to produce AMD.The outcomes show that in-processing technology can be a more proactive approach and an effective tool for avoiding AMD in a porphyry copper WR.

Research on the Impact of China’s Foreign Trade Technology Spillover on Green Total Factor Productivity of Countries Along the“Belt and Road”:Based on the Institutional Quality Threshold Effect

China’s growing trade with countries along the“Belt and Road”Initiative is accompanied by a focus on green development.Based on the panel data from 2007 to 2018,this paper establishes a threshold regression model to empirically analyze the institutional quality threshold effect of China’s foreign trade technology spillover on the GTFP of countries along the“Belt and Road.”The results show that China’s foreign trade technology spillover has a significant institutional quality double threshold effect on the green total factor productivity of the countries along the“Belt and Road.”As the institutional quality of the countries along the“Belt and Road”crosses a specific threshold value,the impact of China’s foreign trade technology spillover on the green total factor productivity of the countries along the“Belt and Road”has a significant positive promoting effect,and corresponding suggestions are put forward.

Green Production Technology of the Monomer of Nylon-6： Caprolactam

After two decades＇ endeavor, the Research Institute of Petroleum Processing （RIPP） has successfully de- veloped a green caprolactam （CPL） production technology. This technology is based on the integration of titanium silicate （TS）-I zeolite with the slurry-bed reactor for the ammoximation of cyclohexanone, the integration of silicalite-1 zeolite with the moving-bed reactor for the gas-phase rearrangement of cyclohex- anone oxime, and the integration of an amorphous nickel （Ni） catalyst with the magnetically stabilized bed reactor for the purification of caprolactam. The world＇s first industrial plant based on this green CPL produc- tion technology has been built and possesses a capacity of 200 kt·a-1. Compared with existing technologies, the plant investment is pronouncedly reduced, and the nitrogen （N） atom utilization is drastically improved. The waste emission is reduced significantly; for example, no ammonium sulfate byproduct is produced. As a result, the price difference between CPL and benzene drops. In 2015, the capacity of the green CPL produc- tion technology reached 3 ×10-6 t·a-1, making China the world＇s largest CPL producer, with a global market share exceeding 50%.

A Complete Set of Technologies for Green Food Pork Production

Key technologies for green food pork production were described in this article,as aspects of business standardization;production equipments and facilities,product quality control;and pork production site establishment.

Technical Regulations for Production of Green Food--Adzuki Beans

According to the experiment and production practice,this paper brings forward the technical regulations on the production technology,the environmental conditions of production area,the output index,the site selection and land preparation,the variety selection and seed quality,the fertilization,the sowing,the field management,the pest and disease control,the harvesting,the storage,the filing etc. about the adzuki beans in Qingyang City.

Empirical Analysis of the Impact of Green Finance and Technological Progress on Total Factor Productivity in China’s Industrial Sector

The enhancement of industrial green total factor productivity is pivotal for achieving high-quality and sustainable economic development.This study assesses China’s performance using the SBM-GML model,employing province-level panel data spanning from 2004 to 2020.Furthermore,we examine the influence of green finance and technological progress on industrial green total factor productivity using a spatial econometric model.The findings uncover that the relationship between the level of green financial development and industrial green total factor productivity follows a U-shaped curve.Initially,low levels of green financial development exert a suppressive effect on industrial green total factor productivity,proving ineffective in the short term.However,with the progression of green finance development,a positive and significant long-term impact on industrial green total factor productivity emerges.Moreover,technological progress demonstrates a noteworthy promotional effect on industrial green total factor productivity.The analysis delves deeper into revealing that industrial structure and environmental regulation intensity exhibit a significant negative relationship with industrial green total factor productivity.In contrast,both energy structure and education level showcase a substantial positive relationship with industrial green total factor productivity.

Sawah Rice Eco-technology and Actualization of Green Revolution in West Africa: Experience from Nigeria and Ghana

The development and dissemination of sawah rice eco-technology in Nigeria and Ghana as prerequisites for the actualization of green revolution in West Africa were described. It showed that the neglect of the eco-technology and the overemphasis of the biotechnology have rendered the ineffective transferability of the green revolution process from Asia to Africa. The sawah eco-technology increases yield up to 5 t/hm2 through bunding and the use of inlet and outlet connecting irrigation and drainage, which enhances effective water control and management, improves the efficiency of fertilizer, improves nitrogen fixation by soil microbes and algae, increases the use of wetlands, improves soil organic matter accumulation, suppresses weed growth, and enhances immune mechanism of rice through nutrient supply. The current experience has therefore established that the technology overcomes the constraints that have limited the realization of green revolution in West Africa.

数字经济赋能区域低碳发展:影响效应与作用机制

数字经济是重塑区域经济的重要驱动力量,厘清其赋能区域低碳发展的作用机制具有重要意义。基于2011—2021年中国省域面板数据,在测度数字经济与区域全要素碳生产率的基础上,实证研究了数字经济对区域全要素碳生产率的影响及作用机制。研究发现:数字经济发展能够显著提升区域低碳经济,一系列稳健性检验表明该结论成立;异质性检验表明,数字经济对中国东、中部地区低碳经济具有显著促进作用,且东部地区数字经济的影响效应明显高于中部地区,而西部地区的数字经济对低碳经济出现“负能”效应,区域经济发展水平和数字化发展水平越高,数字经济赋能区域低碳经济发展的效果越显著;数字经济的发展有利于提升区域绿色技术创新能力、经济集聚水平和数字基础设施建设水平,三者在数字经济赋能区域低碳经济的过程中起到中介作用。地方政府应因地制宜加强数字化基础设施建设并多维度弥合区域数字鸿沟,同时发挥绿色技术进步与经济集聚的桥梁纽带作用,融通数字经济赋能区域低碳发展的传导路径。

Assessment of the implementation status of best available techniques for cleaner production in the textile industry

The draft Integrated Pollution Prevention and Control(IPPC)regulation mandates compliance with best available techniques(BATs)for textile manufacturers.A study in Turkish textile facilities,covering 56 units across four sub-sectors,assessed the status of 488 BATs through on-site visits and surveys.The aim was to gauge the sector’s adherence to BATs.The findings revealed that 37% of surveyed BATs were fully implemented,rising to 88% when considering potential future implementations.This suggests a strong industry inclination toward adopting BATs for cleaner production and competitiveness.The study highlighted significant BAT-related investments in the textile sector,driven by environmental concerns,regulations,customer demands,resource efficiency,competition,and cost-benefit considerations.However,the study results also indicated that there is still much work to do for the implementation of some BATs.It was found that 60 BATs had lower implementation ratios(IR:0%-43%).Lower IR values for these BATs are mainly due to factors like specificity,high costs,long payback periods,operational difficulties,limited expertise,space constraints,customer requirements,quality concerns,operational issues,and sector-specific challenges.The study recommends similar assessments in other European industrial sectors to evaluate compliance with mandatory BATs outlined in the Industrial Emissions Directive.The insights from this study on the Turkish textile sector can serve as a valuable guide for future evaluations.

SMALLHOLDER ADOPTION OF GREEN PRODUCTION TECHNOLOGIES ON THE NORTH CHINA PLAIN: EVIDENCE FROM SCIENCE AND TECHNOLOGY BACKYARDS

Understanding the impact of agricultural socialized services on smallholder adoption of green production technologies and their mechanisms of action is of great importance for sustainability of farming systems.Currently,there were numerous related studies,but it is still unclear how to gradually achieve the diffusion of technological innovations on pilot sites to a regional level.To answer this question,this paper presents the pathways and mechanisms of green production technologies diffusion by comparing international typical service organizations or modes such as agricultural technology extension service centers(ATESC),farmer field schools(FFS),participatory technology innovation(PTI)and integrated colearning approach(ICLA),while taking Wangzhuang Science and Technology Backyard(WZ STB)in Quzhou,Hebei Province,China as an example.This research had three key outcomes.(1)The combination of collaborative,tree-shaped and jump-start diffusion modes promotes the diffusion of participatory technology innovation to different scales,such as farmers,villages and counties.(2)The three diffusion modes combine and expand the advantages of existing international modes.The collaborative diffusion mode not only provides full scope for the advantages of PTI,but also provides smallholders with service supply for the whole production period.The tree-shaped diffusion mode combines the advantages of FFS from point technology innovation to village diffusion,while achieving a full range of technical service support.The jump-start diffusion mode cannot only achieve large-scale technology diffusion like ATESC and ICLA,but also empower smallholders through adaptive technology innovation.(3)Trust is the key to promoting smallholder reliance on the science and technology provided by STB and to promote their adoption of green production technologies.Accordingly,the following policy recommendations were proposed:strengthen the combination of top-down and bottom-up technology innovation and diffusion models,establish an effective service communication platform and evaluation mechanism,and strengthen the linkage mechanism between socialized services providers and smallholders,which will provide a realistic basis for the national policy of targeted socialized services provision and promote smallholder adoption of green production technologies.

Studies on Barriers for Promotion of Clean Technology in SMEs of China

After more than 10 years efforts on awareness raising and promotion, the concept of cleaner production (CP) has been adopting as a strategic approach to balance economic benefits and environmental protection for China’s industries. However, it is also found that clean technology is difficult to be adopted and implemented in Chinese Small and Medium-sized Enterprises (SMEs) because of certain barriers. This paper investigates these barriers among three stakeholders--governments, enterprises and experts. The Analytic Hierarchy Process (AHP) was employed to prioritize the relative importance of the twenty fine-selected barriers, which were classified into four barrier categories. The findings reveal that the exterior barriers of policy and financial barriers should be stressed rather than the inner barriers of technical and managerial barriers, although they are also very important. Absence of incentives on economic policies, lax enforcement of environmental regulations and high initial capital cost were the most important barriers to adoption of Clean Technologies (CT) in China.

Green chemistry of chromate cleaner production

Research topics and methods of green chemistry in chromate production are introduced in this paper. New original green chemical process of the heterogeneous reaction and separation system of liquid phase oxidation of chromite in molten salt of sodium hydroxide—one way separation in high concentration medium—metastable phase separation—carbonate recycle conversion has been developed. The green commercial process for comprehensive utilization of mineral resources—reactant recycle inside the process—zero emission was established.

Rationalizing the Use of Water in Industry—Part 2: Instruments Developed by the Clean Technology Network in the State of Bahia

The instruments developed by the Clean Technology Network of Bahia (TECLIM) at the Federal University of Bahia (UFBA) (cited in Part 1 of this paper) are presented. Factors regarding water management in industry were examined, on the basis of experience acquired over the period of a decade in cooperative research projects with large industrial process plants located mostly in the Camacari Petrochemical Complex, Bahia State, Brazil. The main results consist of training about 1700 industry professionals in CP, the identification of about 500 ideas for the rationalization of water use, the presentation and publication of 90 articles in journals, conferences and other academic events, identification of ideas with potential water savings estimated at around 1400 t·h–1 and the reduction of at least 500 t·h–1 in effluents. Other sectors that make use of water, for example public buildings, commercial buildings, homes, shopping centers and airports can adapt and use the TECLIM method as will be exemplified.

Rationalizing the Use of Water in Industry—Part 1: Summary of the Instruments Developed by the Clean Technology Network in the State of Bahia and Main Results Obtained

Based on cleaner production concepts, a method for water use minimization has been developed by the Clean Technology Network of Bahia (TECLIM) at one of the largest industrial complexes in Latin America located in the State of Bahia, Brazil. This method is concerned with an area of secondary interest to the productive sector: the use of water. Based on the best cleaner production principles (CP), nine instruments have been developed during cooperative projects with chemical, petrochemical and copper metallurgical industries. These instruments are described in Part 2 of this paper [1]. The main benefits derived from partnership schemes include: a reduction in water consumption and effluent generation;the development of a techno-operational culture to increase eco-efficiency;and the introduction of conceptual projects to ensure the continuity of the activities in the company after the projects have been completed. The specific consumption of water was reduced by 20% as a consequence of the application of this method in Company A;a specific reduction in the generation of effluents of more than 40% was observed in Company B;a 42% fall in fresh water consumption in Company C;and a 20% decrease in the cost of effluent treatment in Company D. Among the difficulties encountered were the limited time availability of the operators and engineers for the project, the lack of measurement and calibration of available flow meters and the lack of detailed technical data.

电解锰行业清洁生产评价指标体系研究与应用

清洁生产评价指标体系研究对行业深入推进清洁生产具有重要意义,提出了适用于一般工业行业的“源头控制-过程减排-末端治理-循环利用”全过程清洁生产评价框架模型;构建了由生产工艺及装备等9个一级指标、45个二级指标组成的电解锰行业清洁生产评价指标体系,采用专家咨询-层次分析法确定各指标权重,其中电解锰渣无害化处理率和直流电耗指标的权重分别为0.092和0.050,反映出行业清洁生产的重点和关键点。对3家典型企业的清洁生产水平评价结果表明,案例企业对标Ⅰ级基准得分为40.78~77.26,与清洁生产Ⅰ级水平有差距,指标体系能有效反映电解锰企业的清洁生产水平。结合企业1实际情况,从生产工艺及装备等方面提出10项针对性的清洁生产改造措施建议,为企业推进清洁生产提供参考,也可为行业绿色低碳政策制定提供依据。

保险创新服务新质生产力发展:风险特征、实现路径与对策建议

服务新质生产力发展是新时期保险创新的出发点和落脚点。保险创新主要通过科技保险、绿色保险、数字保险和保险资金运用四条路径服务新质生产力发展,且这四条路径已在宁波保险创新实验区科技攻关保险、粤港澳大湾区环境污染责任保险、人保资本设立科技保险创业投资基金等实例中得到初步印证。但是,保险创新服务新质生产力发展仍存在一些制约因素,需要完善监管与支持政策,开发和丰富产品体系,探索构建“保险元宇宙”生态,优化保险资金配置结构,以期进一步推动保险业守正创新,为新质生产力发展提供有力保障和强劲支撑。

自由贸易试验区助力新质生产力形成的机理与策略分析

高水平对外开放是加快发展新质生产力和构建新发展格局的强大外部动力。自由贸易试验区建设作为推进高水平对外开放的重要举措,是以改革开放创设良好国际环境的开路先锋,是以制度型开放发展新质生产力的先导示范。文章通过分析自由贸易试验区助力新质生产力形成的机理发现,自由贸易试验区作为改革开放的新高地,契合新质生产力高水平对外开放、科技创新、产业升级和绿色发展的理念和定位。为进一步发挥自由贸易试验区对新质生产力的先行驱动作用,未来应从单一自由贸易试验区、区域跨自由贸易试验区、自由贸易试验区与自由贸易区的视角出发,聚焦自由贸易试验区特色产业,布局创新链和产业链,构建新质生产力所需产业体系;推进区域多个自由贸易试验区合作,促进科技协同创新,打造战略性新兴产业集群;加强自由贸易试验区与自由贸易区的协同联动,主动融入区域经济一体化的创新链和产业链,为新质生产力发展营造良好的国际环境。

环保信用评价提高企业绿色全要素生产率了吗?

环保信用评价是生态环境治理与经济绿色转型压力下的一种新型环境治理政策工具。以环保信用评价政策的实施作为一项准自然实验,选取2008—2019年沪深A股上市公司为研究对象,构建三重差分模型,考察了环保信用评价对企业绿色全要素生产率的影响。研究发现:环保信用评价政策显著提高了企业绿色全要素生产率。影响机制分析表明,绿色技术创新和绿色资源获取对环保信用评价政策促进企业绿色全要素生产率提高发挥了中介效应。进一步研究发现,环保信用评价与企业绿色全要素生产率之间的正相关关系在政府监管环境严格的地区、市场竞争环境激烈的行业以及社会信任环境良好的地区更加明显。结论提供了环保信用评价政策经济后果的经验证据,丰富了企业绿色全要素生产率驱动因素的研究文献,对政府部门进一步推广环保信用评价政策、积极引导企业实施环境向善行为、助力实现经济绿色可持续发展等具有建设性作用。

产业数字化对碳生产力的影响研究

在数字经济时代背景下,借助产业数字化平衡经济发展与碳排放之间的关系,对“双碳”目标的实现具有重要意义。本文基于2013~2021年的省级面板数据构建产业数字化水平指标体系,测度后实证探讨产业数字化对碳生产力的影响及作用机制,并多维度比较分析其影响差异。研究发现:产业数字化的发展能够显著促进碳生产力的提升,但该促进作用具有异质性。在中、西部和数字技术水平低的地区,产业数字化对碳生产力的提升作用更强;相比农业和工业数字化,服务业数字化对碳生产力的提升作用更显著。进一步的机制分析表明,产业数字化可通过促进绿色技术创新和优化能源消费结构推动碳生产力提升。本文为深入推进产业数字化的发展以及充分发挥其在实现“双碳”目标中的关键作用提供了理论指导及政策启示。

高水平推进金融强国建设:理论蕴意、现实问题及实现机制——做好金融五篇大文章的视角

高水平推进金融强国建设是当前乃至未来一段时期内我国金融领域工作的重中之重。本文深入阐述做好五篇大文章的重要理论蕴意,客观剖析当前发展面临的主要现实问题,并基于五篇大文章之间的内在逻辑关系分析,提出奋力做好五篇大文章助力高水平金融强国建设的实现机制。研究认为,科技金融是支撑科技强国建设的最有力保障、绿色金融是支撑美丽中国建设的最靓丽底色,普惠金融是支撑共富中国建设的最生动实践,养老金融是支撑和美中国建设的最真实写照,数字金融是支撑数字中国建设的最强大动能。基于此,本文围绕科技强国、美丽中国、共富中国、和美中国、数字中国建设目标,从做深做透科技金融大文章、做精做特绿色金融大文章、做实做细普惠金融大文章、做好做优养老金融大文章,以及做大做强数字金融大文章五个层面提出高水平推进金融强国建设的具体实施机制。