Method for preparing heavy high-purity basic cupric carbonate

Abstract

The invention discloses a method for preparing heavy high-purity basic cupric carbonate. The method comprises the steps that copper, liquid ammonia and high-purity carbon dioxide are used as raw materials, stronger ammonia water is firstly prepared, then high-purity carbon dioxide is fed into the stronger ammonia water to form carbonized ammonia water, carbonized ammonia water is reacted with copper at a certain air pressure to form a copper ammonia complexation solution, the copper ammonia complexation solution is subjected to heating, ammonia stilling, separating, washing, drying and sieving to prepare the heavy high-purity basic cupric carbonate. According to the method for preparing the heavy high-purity basic cupric carbonate, carbon dioxide is directly used as a raw material, so that heavy metal ions and chloride ions are prevented from being brought in, the reaction speed is improved, the production cycle is shortened, the production efficiency is substantially improved, the product purity is higher, the quality is remarkably improved, the product application is wider, and simultaneously the method is high in yield, small in heat dissipation and low in energy consumption, so that the method further meets the environment-friendly requirement and simultaneously reduces the production cost.

Description

technical field [0001] The invention belongs to the production and application field of copper carbonate, in particular to a preparation method of heavy high-purity copper carbonate. Background technique [0002] Basic copper carbonate is a widely used raw material in the chemical industry. It is used in the manufacture of various copper compounds in the inorganic industry, as a catalyst for organic synthesis in the organic industry, as an additive for copper ions in the electroplating industry, and in agriculture. It can be used as a preventive agent for smut, and can also be used as an insecticide for seeds. In animal husbandry, it can be used as an additive to copper in feed. It is also an important medicinal material. In addition, it is also used in pyrotechnics and pigment production. Substitutes for arsenic trioxide. At present, the commonly used method for producing basic copper carbonate uses copper sulfate, copper chloride or copper nitrate to synthesize ba...

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Problems solved by technology

At present, the commonly used method for producing basic copper carbonate uses copper sulfate, copper chloride or copper nitrate to synthesize basic copper carbonate with sodium carbonate or sodium bicarbonate in a dissolved state, and its disadvantages are long cycle, high energy consumption, and production The amount of waste water produced is large, the fineness and precision of the product cannot meet the market requirements, and the quality cannot be guaranteed; there are also methods for producing basic copper carbonate by the ammonia process, and the early method of producing basic copper carbonate by the ammonia process is mainly at room temperature Under strict compliance with Cu+(NH 4 ) 2 CO 3 +2NH 3 [o] →Cu(NH 3 ) 4 CO 3 This synthesis principle is carried out, because the volatility of ammonia, low temperature and other reasons cause the reaction time to be long, and it is difficult to obtain basic copper carbonate monomer. Although this method has been improved later, as the patent application number is 92109468.X " A high-efficiency process for producing basic copper carbonate or copper oxide. The process uses a mixture of heated copper material and ammonium bicarbonate solution. The whole process adopts a pressure-swing reaction, and then thermally decomposes at a temperature of 80 ° C to 100 ° C. Then, basic copper carbonate is obtained by washing and drying, but this method has high requirements on the pressure adjustment of the reaction. At the same time, most thermal decomposition devices use reactors to collect basic copper carbonate through coils. First, the pressure change increases the difficulty of production. Second, it is easy to accumulate and scale in the coil, which affects the yield of basic copper carbonate and also easily increases the impurities in the basic copper carbonate, especially iron, thereby affecting the quality of basic copper carbonate