自2022年1月1日RCEP政策落地生效以来，西宁海关围绕全省特色产业升级需求，定期开展自贸协定实 施效果评估，指导企业根据不同协定项下的降税清单范围、税率优惠幅度及操作程序便利程度做好享惠 规划，引导企业最大限度享受政策红利，证书申报一次性通过率提升至90%以上。强化"预约办理+智能 审核+自助打印"智慧审签模式，实现证书"秒审秒签"。2025年企业自助打印率同比提升64%，有效节约 企业时间成本，提高出口效率。 本报讯 （记者 王菲菲） 1月9日，青海蓝天环保科技有限公司车间里的工人们正加紧赶制一批即将出口 的微硅粉，公司负责人冯智祥说："得益于原产地累积规则，我们的产品在东南亚国家的销售额实现大 幅增长。"据西宁海关统计，2025年全年，西宁海关签发各类原产地证书1094份，同比增长25.3%。其 中，签发RCEP原产地证书235份，增长32.8%。 原产地证书在国际贸易中被誉为"纸黄金"，出口企业凭此即可在进口国享受关税减免及其他优惠待遇。 RCEP原产地证书是指《区域全面经济伙伴关系协定》原产地证书，是原产货物在进口通关时证明原产 资格及原产国，确定关税税率及享受优惠关税待遇的重要凭证。 ...

Core Viewpoint - The article discusses the differences between quartz powder and silica micro powder, including their production methods, physical and chemical properties, and application fields. Group 1: Definitions and Production - Quartz powder is a coarser form of SiO2 obtained by crushing quartz ore, while silica micro powder is a finer form produced through grinding or chemical methods to achieve high purity [1] - Micro silica, also known as silica fume, is a byproduct of industrial processes, specifically from the collection of smoke dust in smelting plants, containing about 90% SiO2 [3] - White carbon black is produced through chemical methods and can achieve a purity of up to 99% with particle sizes ranging from 10 to 20 nm [3] Group 2: Historical Context - The earliest silica micro powder originated from dust collected from steel plant chimneys, primarily used in the refractory materials industry in the early 1990s [4] - In the late 1990s, the rapid development of the electronic circuit board industry in China led to the ultra-fine purification of quartz powder, which became known as silica micro powder [5] Group 3: Physical and Chemical Properties - Both silica micro powder and quartz powder are fine materials with particle sizes typically below 1 micron, but they differ in physical properties; silica micro powder is lighter and less dense, while quartz powder is denser [7] - Chemically, silica micro powder is a form of SiO2 with a non-crystalline structure and many active surface groups, whereas quartz powder is made from crushed crystalline quartz [7] Group 4: Application Fields - Silica micro powder is widely used in electronics, optics, ceramics, cosmetics, coatings, and plastics to enhance material stability, reduce costs, and improve processing performance [7] - Quartz powder is primarily used in glass, ceramics, cement, building materials, and metal surface coatings due to its high hardness and chemical stability [7]

Core Points - The company has completed the registration change and received a new business license, reflecting a reduction in registered capital from 423,462,140 RMB to 423,299,750 RMB [1] - The total number of shares has decreased from 423,462,140 to 423,299,750 [1] - The company operates in the production and R&D of zirconium series products, advanced grinding materials, and other related industrial materials [1] Company Information - The company is named "三祥新材股份有限公司" (Sanxiang New Materials Co., Ltd.) and is a joint-stock company [1] - The registered capital is now 42329.9750 million RMB [1] - The company was established on August 24, 1991, and is located in Fujian Province, China [1] Business Scope - The company’s business includes the production and R&D of zirconium series products, single crystal alumina advanced grinding materials, and casting core wires [1] - It also engages in the production of micro-silica powder and various chemical products used in construction ceramics, functional ceramics, and refractory materials [1] - The company is involved in industrial material technology testing and services, subject to relevant approvals [1]

1. 硅业新材料生产流程简介 1.1 目标产品： 硅业新材料主要目标产品为工业硅，副产品为微硅粉； 其中工业硅执行《工业硅》 (GB/T2881-2014）标准； 微硅粉执行《电炉回收二氧化硅微粉》GB/T21236-2007标准； 1 .3 烟气特性： 矿热炉烟气，一般温度在450-650度，经过余热锅炉回收热量后，经过脱硫除尘脱硝处理，排入大气； 1.2 设备设施及工艺流程： 工艺流程可分为配料、冶炼、精炼、成品加工、尾气处理等阶段；主要原料包括硅石、洗精煤、木块 等； 设备设施主要包括矿热电炉生产线、配套余热利用发电、余热回收系统、氧气精炼系统、配套烟气除尘 及微硅粉加密系统等； 工艺流程图如图所示（图1）： 根据物料特性和燃烧情况，烟气中污染物含量基本情况如下： 颗粒物浓度为3000mg/m 3 左右，通常在1000mg/m 3 -3000mg/m 3 之间； 硫化物浓度在100mg/m 3 -150mg/m 3 左右； 氮氧化物浓度在200mg/m 3 左右； 2. 脱硫脱硝方案选择 根据图1所示的流程图可以看出：以往普遍采用的脱硫脱硝方式为SDS（小苏打直喷）+布袋除尘器收尘 +SCR脱硝； 然而 ...