In the calcium carbonate industry, especially heavy calcium carbonate, there are problems such as power consumption, ore loss, dust and noise pollution in the production process. Heavy calcium enterprises must fully realize green and sustainable development from the aspects of product transformation, process control and waste reduction treatment. 1. Product - Refinement and functionalization my country's heavy calcium has higher value is its deep processing products - fine, high-purity, surface modification products. At present, the downstream market has put forward higher and higher requirements for heavy calcium products. The refinement of heavy calcium products is a direction of future development. To achieve product refinement, large-scale wet/dry equipment technology, modified equipment and ultra-fine A complete set of technology for graders. The functionalization of calcium carbonate products is more reflected in appropriate surface treatment, such as providing compound active agents in a targeted manner, surface treatment with stearic acid and coconut oil, and silane coupling active agents to enhance active heavy carbonic acid. calcium quality level, expand service areas, and improve application value. 2. Production - large scale my country's heavy calcium production enterprises have a large production capacity, with an annual production capacity ranging from 100,000 tons to hundreds of thousands of tons or even millions of tons. However, there are only a handful of heavy calcium production equipment with a unit output of 50,000 tons. Large-scale high-efficiency energy-saving production equipment and advanced production technology can be used to achieve the purpose of reducing energy consumption. It can learn from the successful production and management concepts of world-renowned calcium carbonate companies, such as vertical mill/ball mill and other large-scale dry grinding equipment and ultra-fine classifier combination technology. 3. Waste - Recycling and Reduction Enterprises should establish a waste water recycling center, and concentrate all the domestic and industrial water waste water pipes in the factory to the waste water treatment center, and adopt the methods of flocculation, sedimentation, recovery and recycling to save water and reduce waste discharge. For coal combustion, high-heat and low-sulfur coal should be selected. At the same time, the waste gas generated by coal combustion should be dedusted by water film, and then discharged after purification.

Superfine talc is a water-containing magnesium silicate mineral. When it is used in coatings, it can impart excellent brushability, leveling, and gloss retention to coatings. It has high impact resistance and flexibility, and high hardness, and can effectively improve the corrosion resistance and dryness of the coating. The amount of superfine talc added has an impact on the coating properties. When the added amount is large, the transmittance and adhesion of the coating decrease, and the flexibility and impact resistance of the coating hardly change. Due to the addition of ultra-fine talc, the solid content of the coating increases, and the surface drying ability and tackiness of the coating are improved. The Mohs hardness of talc is 1. The more talc added, the higher the hardness of the coating, and the characteristic structure of ultra-fine talc can effectively improve the leveling of the coating and reduce the defects of the coating. It can also effectively extend the diffusion path of the corrosive medium, thereby improving the corrosion resistance of the coating. However, adding too much superfine talc powder will increase the covering power of the coating and decrease the light transmittance. At the same time, the adhesion of the coating layer is decreased due to the weak bonding force between the talc powder layers and easy cracking. Because of its high aspect ratio, ultrafine talc can impart high impact resistance and fracture toughness to the coating, so the coating has stable flexibility and impact resistance.

Fire retardant coatings are divided into three types: thick coating type, thin coating type and ultra-thin type according to the coating film thickness. In addition to the relatively large influence of flame retardants and emulsions on the performance of fire retardant coatings, the influence of fillers is also very important. Although the proportion of fillers in the entire fire retardant coating is not large, it has an important impact on the performance of the fire retardant coating. In ordinary coatings, fillers usually play the role of reducing costs and improving the physical and chemical properties of coatings, while in fire-retardant coatings, they also play a role of flame retardant. Due to the differences in the composition, morphology, physical properties, etc. of each filler, the roles played in the fire retardant coatings are also different. 1. Although the coating with added calcium carbonate has a high expansion height and increases the distance between the flame and the steel plate, due to the large bubble in the middle instead of a uniform and dense honeycomb carbon layer, the heat insulation effect is not good, and the fire resistance time is short. Therefore, calcium carbonate is not suitable for use in fire retardant coatings. 2. Although the expansion height of the talc powder carbon layer is lower than that of calcium carbonate, the quality of the talc powder carbon layer is better than that of calcium carbonate, and the refractory time of the coating containing talc powder is better than that of calcium carbonate, indicating that the quality of the carbon layer is better than the expansion height. more important. 3. Comparing kaolin, talc and wollastonite powder with the same quality of carbon layer, wollastonite powder has the highest swelling height, followed by kaolin, and talc powder is the lowest. The order of refractory time is also wollastonite powder > kaolin clay > talc powder. It can be seen from this that the order of the fire resistance time is the same as the order of the expansion height, which means that when the quality of the carbon layer reaches the standard (that is, the middle of the carbon layer is dense honeycomb), the higher the expansion height, The effect of fire and heat insulation is better. That is to say, the effect of kaolin and talc is the same as that of wollastonite powder, but the performance is not as good as that of wollastonite powder. Of course, the carbon layer should not be too high, otherwise, the carbon layer will be separated from the steel plate, and it will not play a role in fire prevention. 4. Use wollastonite powder, aluminum hydroxide and hollow microbeads as fillers for the fireproof coating, in which wollastonite powder plays the role of skeleton, aluminum hydroxide plays the role of smoke suppression and cooling, and hollow microspheres play the role of enhancing the strength of the carbon layer. In a word, by taking full advantage of the low price of fillers and cooperating with other flame retardant additives, fire retardant coatings with excellent performance can be prepared.

Powder is involved in many industries and fields. It can be said that powder technology is one of the basic technologies supporting high and new technology. The so-called powder technology includes two aspects, one is the design and manufacturing technology of powder particles, and the other is the powder processing technology, that is, how to add powder to other substances to play its unique role. The addition of ultra-fine talc masterbatch to plastics can significantly improve the rigidity and creep resistance, hardness and surface scratch resistance, heat resistance and heat distortion temperature of plastic products. Improve the impact strength of plastic products. And after adding, it also has lubricating effect, can play a role in promoting flow, and improve the processing technology of plastics. 1. Application in polypropylene resin: Talc is often used to fill polypropylene. Talc has a flake-like structure characteristic of flake configuration. Therefore, talc with finer particle size can be used as a reinforcing filler for polypropylene. In the modification system of polypropylene, adding superfine talc masterbatch can not only significantly improve the rigidity, surface hardness, thermal creep resistance, electrical insulation and dimensional stability of polypropylene products, but also improve polypropylene products. impact strength. Adding a small amount of talc powder to polypropylene can also act as a nucleating agent to improve the crystallinity of polypropylene, thereby improving the mechanical properties of polypropylene. Transparency of polypropylene. 2. Application in polyethylene resin: Talc is a natural magnesium silicate with four particle types: fibrous, lamellar, acicular and standard (frozen stone). But only laminar is used in industry. The layered sandwich structure of talc, each layer has a certain water resistance and a high degree of chemical inertness, so it has good chemical resistance and sliding properties. Filling polyethylene with it can be used as engineering plastics, has good chemical resistance and fluidity, and can compete with ABS, nylon and polycarbonate. Filling polyethylene with it can improve the following properties: increase toughness, flexural modulus and twisting modulus; increase flexural strength; reduce creep tendency at room temperature and high temperature; increase thermal change temperature and dimensional stability; improve deformation and warpage, and also have a lower coefficient of thermal expansion; improve thermal conductivity; improve the surface hardness and smoothness of molded parts; improve the mechanical strength of polyethylene. 3. Application in ABS resin: The superfine talc masterbatch produced by special method has good dispersion and uniformity when added to plastics. ABS resin is an amorphous polymer with excellent molding processability like polystyrene; it has good impact strength, good low temperature resistance, high tensile strength, good creep resistance, and can withstand 7Mpa load without dimensional change Therefore, it is often used to injection mold the shells of various instruments, TV sets, tape recorders, mobile phones, etc. Of course, it is also widely used in other fields such as textile equipment, electrical parts, auto parts, and aircraft parts. However, people are not satisfied with the existing performance of ABS, and the research on ABS modification has been carried out extensively, and the relevant information published is not small. 4. Application in polystyrene resin: Unmodified general-purpose polystyrene is an amorphous polymer, which is hard and brittle, but it has good electrical properties, aging resistance and high dimensional stability. The disadvantage is that it is highly brittle and sensitive to environmental stress cracking. The addition of superfine talc masterbatch can improve the impact toughness, adjust the rheology, significantly improve the flexural modulus, and also improve the tensile yield strength. 5. Application in nylon resin: For nylon (polyamide), the industry pays special attention to the toughness and wear resistance of this plastic. Nylon is generally hard, horny-like, with good abrasion resistance and high dimensional stability. These properties can be further enhanced by fillers or reinforcing agents. The hardness, stiffness, wear resistance and heat distortion temperature of PP66 are the highest in nylon; PP6 is known for its higher toughness; PP610 has lower water absorption and thus higher dimensional stability; PP11 has the highest impact strength in nylon. the highest. Among various fillers, talc with layered structure can improve the original good properties of nylon, and it is most important to improve wear resistance. Compared with metal, unfilled modified nylon has low elastic modulus, low tensile and creep strength, and mechanical properties are significantly dependent on temperature. The molecule contains water-absorbing gene amine group, which has high water absorption rate, and the product is easy to absorb water during use. Expansion deformation, rapid cooling and incomplete crystallization during processing and molding, and still crystallization during use, which leads to deformation of the product and even cracking. The above shortcomings of nylon can be greatly improved by adding ultra-fine talc masterbatch. Talc powder has the function of nucleating agent, which can increase the crystallization rate of nylon and increase the degree of crystallinity after adding; therefore, it can especially improve the toughness of nylon. , mechanical strength, hardness, thermal stability, dimensional stability, improve product surface quality and deformation behavior, also have a good impact on moisture absorption, electrical properties and chemical properties.?? 6. Application in other resins: 1. In fluoropolymers such as polytetrafluoroethylene, the addition of fillers or reinforcing agents can improve creep strength, wear resistance, toughness, thermal conductivity, compressive strength, hardness, creep tendency and thermal resistance at high temperatures. deformability. 2. Adding fillers to polyoxymethylene can further improve its own toughness. 3. Adding superfine talc masterbatch to polycarbonate can improve toughness. 4. Adding ultra-fine talc masterbatch to polyphenylene sulfide can obtain better processability, lower shrinkage, accurate mold release size and improved surface gloss.

1. Dispersant The surface of ordinary calcium carbonate is hydrophilic, it is not easy to disperse in the organic medium, the viscosity of the mixed system of it and the organic medium increases sharply with the increase of its content in the mixed system; The surface of calcium carbonate is lipophilic, it is easy to disperse in the organic medium, and the viscosity of the mixed system of it and the organic medium tends to increase greatly with the increase of its content in the mixed system. Since the surface of calcium carbonate is weakly alkaline, the carboxyl group of the organic acid has an affinity for the surface of calcium carbonate. In addition, because the hydrocarbon group of the organic acid has an affinity with the high polymer, the agglomeration phenomenon of the activated calcium carbonate is inhibited, so the calcium carbonate modified by the organic acid has better dispersibility in rubber and plastics. 2. Surfactant Surfactant has hydrophilic group and lipophilic group, the hydrophilic group has affinity with calcium carbonate, and the lipophilic group has affinity with high polymer, when the surfactant is located between calcium carbonate and high polymer. Over time, the surfactant binds the calcium carbonate and rubber or plastic more tightly together through these two groups. 3. Silane coupling agent Silane coupling agent is a low molecular compound. The coupling mechanism of silane coupling agent is mostly chemical bonding. After the calcium carbonate is modified by the silane coupling agent, a chemical covalent bond is formed between the calcium carbonate and the silane coupling agent, so that the calcium carbonate and the silane coupling agent are firmly bonded together. Therefore, through the bridge action of the coupling agent, the rubber molecules and the calcium carbonate molecules are closely connected, so the calcium carbonate modified by the silane coupling agent shows reinforcement. 4. Titanate coupling agent Typical coupling agents are organic compounds containing silicon or metal atoms, and their molecules contain groups that can react with the surface of calcium carbonate to release hydrogen atoms, and also contain long bond groups with specific structures or functional groups such as double bonds.