Method for preparing high soda ash type copper carbonate by adopting duplex centrifugal film evaporator

Abstract

The invention discloses a method for preparing high soda ash type copper carbonate by adopting a duplex centrifugal film evaporator. The method comprises the following steps: using copper, liquid ammonia and high-purity carbon dioxide as the raw materials; firstly, preparing stronger ammonia water; secondly introducing the high-purity carbon dioxide into the stronger ammonia water so as to prepare carbonized ammonia water; reacting the carbonized ammonia water with pure copper under a certain air pressure so as to prepare a copper-ammino complexing solution; further evaporating by using the duplex centrifugal film evaporator, rotationally separating and scrapping so as to prepare the high soda ash type copper carbonate. By utilizing the method, the reaction speed is increased, the production period is shortened, the product is higher in purity, the production efficiency is greatly improved, the production cost is lower, the quality is significantly improved, and the product application is wider; and meanwhile by adopting the duplex centrifugal film evaporator, the method is high in yield, small in heat radiation and short in reaction time, the coal resource is saved, and the requirements on environmental-friendliness are met better and at the same time the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of production and application of copper carbonate, in particular to a method for preparing high-purity copper carbonate by using a compound centrifugal film evaporator. 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 chlor...

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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

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