Preparation process of calcium carbonate powder with ultra-small particles

Abstract

The invention relating to the field of calcium carbonate powder processing discloses a preparation process of calcium carbonate powder with ultra-small particles. Carbide slag is subjected to primarycrushing; the product is crushed into one with primary granularity, and then washing is performed with a slightly acidic solution; then, treated granularity carbide slag flushed by slightly acidic liquid is mixed with distilled water according to the mass ratio of 1:2; an impurity removing agent is added and stirring is performed; filtration of the mixture is performed, carbon dioxide is introduced for heating and drying; and secondary crushing is carried out on the dried carbide slag with the primary particle size and then grinding is performed; air flow conveying of ultra-small particle calcium carbonate powder is performed through air separation equipment in the grinding process, the ultra-small particle calcium carbonate powder is conveyed into a cloth bag, the ultra-small particle calcium carbonate powder in the cloth bag is collected and mixed into a reaction kettle, and stirring carbonization is performed to form powder crystals. The process is relatively simple, three-stage screening, impurity removal, crushing and grinding are conducted, the particle size of powder generated through grinding is smaller, machining of the artificial stone plate is facilitated, tiny powder obtained after air supply is crystallized and then ground again, and the color and luster are better.

Description

technical field [0001] The invention relates to the field of calcium carbonate powder production technology, in particular to a preparation technology of ultra-small calcium carbonate powder. Background technique [0002] Artificial stone is one of the main building decoration materials in today's society. It can replace natural stone, high-grade ceramics, wood, and metal decoration materials. It is a green and environmentally friendly high-grade building material. Resin-based artificial stone is based on unsaturated polyester resin or epoxy resin as a binder, and a certain amount of filler is added. It has the characteristics of beauty, practicality, safety, and environmental protection. It is a fast-growing variety of artificial stone. Calcium carbonate is a resin The most important filler of base-based artificial stone generally accounts for more than 75% of the mass of artificial stone, and the greater the amount of filling, the less the amount of resin used, the lower t...

AI Technical Summary

Problems solved by technology

Resin-based artificial stone is based on unsaturated polyester resin or epoxy resin as a binder, and a certain amount of filler is added. It has the characteristics of beauty, practicality, safety, and environmental protection. It is a fast-growing variety of artificial stone. Calcium carbonate is a resin The most important filler of base-based artificial stone generally accounts for more than 75% of the mass of artificial stone, and the greater the amount of filling, the less the amount of resin used, the lower the production cost, and the more environmentally friendly, and the calcium carbonate in the process of manufacturing stone. It exists in the form of powder. At present, calcium carbonate powder is mainly produced by calcium carbide slag. Carbide slag is the waste residue produced in the process of producing acetylene by calcium carbide method. The main component is Ca(OH)2. In recent years, the output and demand of calcium carbide The continuous increase makes the production of calcium carbide slag continue to rise. The calcium carbide slag is piled up without treatment or simply landfilled, which will cause serious pollution to soil, air and water, and endanger the natural environment and human health. Calcium carbonate slag is used as raw material to prepare calcium carbonate , which not only turns waste into wealth, but also protects the environment and saves mineral resources. It has good economic and environmental benefits. At present, the calcium carbonate powder produced by calcium carbide slag has large particles and poor color