3 results about "Calcium nitrite" patented technology

This invention belongs to the field of concrete technology, specifically disclosing an anti-corrosion coating material for concrete pipelines. It is made from the following raw materials in weight percentages: water 22.5%~23.0%, calcium nitrite 0.5%~1.5%, and silicate cement 75.0%~77.5%. This invention also discloses a method for preparing the anti-corrosion coating material for concrete pipelines, including the following steps: (1) weighing each raw material according to the weight ratio; (2) mixing the dry calcium nitrite and silicate cement evenly; (3) slowly pouring in the aqueous solution and stirring slowly, then stirring rapidly for 1 minute after even mixing to obtain the pipeline anti-corrosion coating material. This invention has economic and environmental advantages, and the coating also possesses outstanding anti-corrosion performance, solving the problem of concrete durability degradation caused by internal chemical corrosion and microbial corrosion in municipal sewage pipelines, and effectively extending the service life of pipelines.

The utility model relates to a kind of outdoor anti-corrosion anti-freezing anti-solar manure anaerobic fermentation red mud film methane tank, including pool wall body, the pool wall body is embedded in stratum, the pool wall body is formed by concrete adding silicon powder and calcium nitrite mixed solidification, epoxy resin coating is fixedly arranged in the lower end of the pool wall body inside, the epoxy resin coating is arranged in the pool wall body inside arc, drainage hole is set in the both sides of the pool wall body and is close to its lower end, the both sides of the pool wall body and located corresponding drainage hole place are fixedly set with through pipe, support is fixedly arranged in the pool wall body inside.The utility model in the present application, the methane tank is arranged in arc epoxy resin coating, drainage hole and support can make rainwater to be discharged smoothly, protect red mud fermentation bag from soaking in accumulated water in use process, and can be reserved expansion joint for red mud fermentation bag, adapt to expansion and shrinkage of temperature change and prevent accumulation of snow.

The application discloses a salt additive melt blending pretreatment method of PET products. After the PET products are crushed, the salt additive is mixed, melt blending is carried out at 268-275 DEG C for 4-5 minutes, direct cooling is carried out without quenching, crushing and 80 mesh screening are carried out, and a pretreatment product is obtained. The salt additive is selected from one or more of sodium nitrate, sodium nitrite, potassium nitrate, potassium nitrite, calcium nitrate, calcium nitrite, sodium bisulfate, potassium bisulfate, sodium phosphate and potassium phosphate, and the addition amount is 0.5%-1.0% of the mass of the crushed PET material. The method can control the crystallinity increase, improve the powder yield, and the obtained product can be used for subsequent enzymolysis.