How is Hopcalite Made?

As a highly effective carbon monoxide adsorbent, hopcalite is widely used in gas masks, gas purification equipment, and other fields. Its production process requires in-depth research and control of raw materials, formulation, and process. When selecting raw materials, the core components are copper oxide and manganese dioxide. Hopcalite purity is crucial. Typically, copper oxide purity of ≥98% and manganese dioxide purity of ≥95% are required. Excessive impurity content in the raw materials can reduce adsorption activity. Furthermore, the raw material particle size should be controlled between 100-200 mesh to ensure uniform mixing.

The copper oxide and manganese dioxide are then added to a mixer in a ratio of 3:2, along with a small amount of deionized water as a binder. The mixing speed is controlled at 300 rpm for two hours, maintaining the material humidity between 15% and 20%. Hopcalite mixing uniformity is crucial.

During the molding stage, the mixture is pressed into columns or granules using a tablet press. The molding pressure is set at 15 MPa. Too little pressure will result in looseness, while too much pressure will reduce porosity. The granules are then dried in an oven at 80°C for four hours to remove moisture. Activation is a key step in improving performance. The dried pellets are placed in a muffle furnace and heated at a rate of 5°C/min to 350°C under air, where they are held for two hours. This "high-temperature activation of the hopcalite" promotes crystal lattice reconstruction, forming abundant active sites. After activation, the pellets are allowed to cool naturally to room temperature, completing the entire production process.

The final hopcalite undergoes adsorption performance testing to ensure a carbon monoxide adsorption capacity of ≥100 mL/g, meeting the "industrial-grade hopcalite standard." Parameters at each step of the entire process must be strictly controlled to ensure product stability and efficiency.

author: Hazel
date: 2025-09-15