Plasma / DC arc furnace refractory material

  公司于2021年与郑州大学高温研究所，东北大学冶金系，针对国内现阶段高温超高温熔炼炉现状，联合成立超高温冶炼炉技术创新战略联盟，针对超高温熔炼电弧炉在危废处理，富集贵金属，活泼金属提炼等领域面临的重大技术课题展开联合研究，填补部分领域的国内空白。形成具有自主知识产权的产业标准、专利技术和专有技术，加速推动超高温冶炼炉相关技术的产业化运用。

in 2021 henan hongda and Zhengzhou university - high temperature R&D center , northeastern university - metallurgy college , at the current domestic high temperature & ultra- high temperature melting furnace, jointly set up high temperature smelting furnace technology innovation strategic alliance, for ultra- high temperature melting arc furnace in hazardous waste treatment, rich precious metal collect , lively metals refining etc ,which has the key tech problem to Launch a joint study & research, to fill some tech gaps in this field of domestic market.To form industrial standards, patented technologies and proprietary technologies with independent intellectual property rights, and accelerate the industrial application of technologies related to ultra-high temperature smelting furnace.

  结合贵司炉型设计以及相关炉衬设计要求。我方设计思路如下：

Combined with your furnace type design and related furnace lining design requirements.Our design ideas are as follows:

  1、由于处理物为飞灰、危废残渣，其化学成分复杂，含有毒性高、易致癌和污染大的重金属、盐、二噁英等，如不进行严格而科学的管理，将对土壤和水质造成几乎无法修复的污染。熔融炉的工艺温度较高(＞1400℃ )，耐材损坏的主要方式为侵蚀、熔损，要求炉衬材料的耐蚀性，抗侵蚀性能，选用气孔率低、耐酸碱侵蚀性能好的材料。

Because the treated materials are fly ash and hazardous waste residue, their chemical composition is complex, containing heavy metals, salts and dioxins, which are highly toxic, carcinogenic and polluting. If not strict and scientific management, it will cause almost irreparable pollution to the soil and water quality.The process temperature of melting furnace is high (> 1400℃), and the main ways of material damage resistance are corrosion and melting loss, requiring corrosion resistance and corrosion resistance, and selecting materials with low stomatal rate and good acid and alkali corrosion resistance.

  2、残渣在高温熔融状态下，部分化学成分易转变为活泼性金属或强氧化物，可与无机非金属物质产生反应，在高温下生产液相，由于耐火材料本身为无机非金属材料，故在熔炼炉工作过程中存在活泼金属或强氧化物于耐材本体，能反应生成低温液相。

Residues in high temperature melting state, part of the chemical composition is easy to change into active metal or strong oxide, can react with inorganic nonmetallic substances, produce liquid phase at high temperature, because the refractory itself is inorganic nonmetallic material, so in the process of active metal or strong oxide in the resistant material body, can generate low temperature liquid phase.

  3、飞灰、危废残渣冶炼时间长，熔融炉需要较长时间冶炼，持续保持在高温状态，局部耐材易被飞灰和残渣侵蚀、熔损。

The smelting time of fly ash and hazardous waste residue is a long time, melting furnace needs a long time to smelting, keep in a high temperature state, the refractory material layer is easy to be eroded and damaged by fly ash and residue.

  4、飞灰、残渣在熔融状态下，具有一定的粘稠度，在热辐射区域内有较好流动性，超出一定区域后溶液粘度迅速加大。在耐材的工作层形成结圈层，在熔炉出料和加料后，炉温下降后容易产生收缩剪切应力，对耐材层形成应力破坏。

In the melting state, the fly ash and residue have a certain viscosity and a good fluidity in the thermal radiation area, and the viscosity increases rapidly out of the thermal radiation zone.at the hot face layer of the refractory layer, it will be easy to make one slag layer , in the furnace feeding and tapping process , the furnace temperature will be have a fast temp change , the slag layer will be have the shrinkage shear strain , to damage the refractory layer.