Gypsum is one of the advantageous mineral resources of our country. China has rich reserves of gypsum and the reserve of all kinds of explored gypsum is about 57.6 billion, which ranks first in the world and has wide distribution and various types. Gypsum is an important raw material in the production of mold production. As it has low price, fast setting and hardening, short production cycle and fast turnover, large-scale industrialized production can be realized, thus bringing forward the service cycle. As the magnification ratio of the gypsum is small, and the drying shrinkage is even smaller, the size of the plaster mold product is stable and the deformation is small. In addition, the gypsum materials are neutral and have weak radioactivity, so that in the production and using process, there is no harmful materials emitted, and the appearance is smooth and fine and has high affinity with human body. Its unique breath effect can absorb or liberate moisture with the humidity changes of the surrounding environment, making it the first choice for raw materials in the mold industry.
Semi-hydrated gypsum is the main component of gypsum mold. After hydration and hardening, the semi-hydrated gypsum will become dihydrate gypsum, and when it dries, it will produce some holes and become plaster mold with hydroscopicity and some strength. At present the semi-hydrated gypsum used for making gypsum mold can be divided into two types: αtype semi-hydrated gypsum and βtype semi-hydrated gypsum. The latter type has big specific volume, more water consumption for marked thickening, high porosity after gelatinization and low strength. The plaster mold made of this type of semi-hydrated gypsum has the advantages of high water absorption, but low softening coefficient and short service life. The former type has small specific volume, low water consumption for marked thickening and high strength after gelatinization, so that it is commonly known as high strength gypsum. The mold made of this type of semi-hydrated gypsum has high strength and long service life, but low water absorption, long molding time, low production efficiency, big solidification expansion rate, which will influence the dimensional precision and increase the production cost. For this reason, to completely make up for the above-mentioned defects of the semi-hydrated gypsum used for making plaster mold, it is necessary to control it from the gypsum power.
The gypsum powder processed by the first-class gypsum production line of Henan Hongxing Mining Machinery Co., Ltd. can promote the mold industry of our country to realize leapfrog development. This production line is composed of crushing system, conveying system, powder grinding system, calcination system and electric control system. All the machines used in this production line are independently researched and developed by our company and have independent intellectual property right. According to the size of the gypsum raw materials and different output need, specific crushing and grinding equipment can be chosen, including PE jaw crusher, PF impact crusher, European type impact crusher, HPC cone crusher, spring cone crusher, 5X new type of sand maker, VSI sand maker, vertical grinding mill, high pressure suspension grinding mill and super-fine Raymond mill.
Source of this article：HX China edit：HX China
Now the weather is becoming colder and colder, and winter will be coming soon, then how can we well maintain the spiral sand washer in winter?
Return to the news center Back to home page
