Method for preparing heavy high-purity basic cupric carbonate

Abstract

The invention discloses a method for preparing heavy high-purity basic cupric carbonate. According to the method, copper, liquid ammonia and high-purity carbon dioxide are taken as the raw materials; high-purity carbon dioxide is blown into stronger ammonia water, and carbonized ammonia water is obtained through controlling the carbonization degree; the carbonized ammonia water reacts with copper under certain air pressure to obtain a copper-ammonia complex solution; and finally heavy high-purity basic cupric carbonate is obtained through heating, ammonia distilling, separating, washing, drying and screening. According to the method, carbon dioxide is directly taken as the raw material, so that heavy metal ions and chloride ions are prevented from entering, as a result, the reaction speed is improved, the production period is shortened, the production efficiency is greatly improved, the product purity becomes higher, the impurity is less, the quality is significantly improved, the product is more widely applied, meanwhile, the yield by adopting the method is high, the heat dissipation is less, the energy consumption is lower, the environment protection requirement is met more satisfactorily and the production cost is greatly reduced at the same time.

Description

technical field [0001] The invention belongs to the field of production and application of copper carbonate, in particular to a method for preparing 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 b...

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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