53results about How to "Prevent excessive volatilization" patented technology

The invention discloses a preparation method of a multilayer ceramic capacitor. In the preparation process of the multilayer ceramic capacitor, the sintered block and the laminated body are mixed andsintered, after the sintering auxiliary agent in the sintered block volatilizes, a local atmosphere with high volatilization concentration is formed around the laminated body, the excessive volatilization of the sintering auxiliary agent in the laminated body is effectively prevented, and the sintered ceramic body is uniform, compact and consistent. The surface of the sintered block adopted by theinvention is attached with copper particles, so that adhesion between the sintered ceramic body and the sintered block can be avoided. The ceramic body prepared by the invention is uniform and compact, has good consistency, does not adhere to the sintered block, and is easy to screen with the sintered block.

The invention relates to a production method of selenium sulfide. The method comprises the following steps: preparing 100-200g / L selenium dioxide solution through stirring, filtering, preparing 150-350g / L sodium sulfide solution, filtering, dropping sodium sulfide solution and glacial acetic acid at the same time in the selenium dioxide solution under stirring, stirring continuously to promote the reaction; placing the obtained solution in a centrifugal machine after the reaction for centrifugal separation, washing the obtained selenium sulfide product to be neutral; and drying to obtain the selenium sulfide product. The method in the invention has simple and practical technology, is easy to operate and can meet the requirements of environmental protection. In the operation, the dropping speed is required to be controlled when sodium sulfide and glacial acetic acid are dropped; hydrazine hydrate can be added in the residual solution with unreacted selenium dioxide after the centrifugal separation to reduce selenium dioxide and recycle selenium, thus the production cost can be effectively reduced and controlled and the method is environmentally friendly; and the reaction temperature is controlled in the reaction process, thus less acetic acid can be volatilized.

The invention belongs to the technical field of gas purification, and provides a demisting assembly for steel wire surface treatment.The demisting assembly comprises a cover shell arranged on the upper portion of a pickling tank in a matched and buckled mode, a flow guide pipe arranged on the top of the cover shell in a communicated mode, a mist collecting tower arranged on the top of the flow guide pipe and a separating tower arranged at the side of the mist collecting tower side by side; the mist collecting tower and the separating tower are communicated through an air pipe, the side of the mist collecting tower is radially provided with a mist exhaust pipe, the inner end of the mist exhaust pipe extends to the middle of an inner cavity of the mist collecting tower and corresponds to the air pipe, and the outer end of the mist exhaust pipe is connected with a draught fan.According to the steel wire surface treating and demisting assembly, the structural design is reasonable, and concentration of acid mist can be achieved through the cover shell and the flow guide pipe, so that the continuously increased acid mist flows to the mist collecting tower through the flow guide pipe and is conveyed into the separating tower in a static state; no negative pressure influence can be caused to acid liquid in the pickling tank in the process, so that the acid mist between the pickling tank and the cover shell is in a static state; accordingly, the stability of the whole system is guaranteed, and excessive volatilization of the acid mist is avoided.