Compound centrifugal film evaporator and method for preparing high-purity soda ash-type copper carbonate

Abstract

The invention discloses a compound centrifugal film evaporator and a method for preparing high-purity soda ash-type copper carbonate. A steam deposal chamber of the compound centrifugal film evaporator is provided with a vapor-liquid filter and a vapor-liquid separator; a tail gas collecting opening and a secondary steam recovery opening are arranged at the outer wall of the steam deposal chamber; a distributing device is arranged at the top end of an evaporation chamber; a material inlet is arranged at the outer wall of the distributing device; the secondary steam recovery opening is communicated with the material inlet through a condenser and a feeding pump orderly; a sample collector is connected to one side of a discharge valve of a taper discharge chamber; a screw feeder is connected to the other side of the discharge valve; and the screw feeder is communicated with the material inlet through the condenser and the feeding pump orderly. According to the method for preparing the high-purity soda ash-type copper carbonate by the compound centrifugal film evaporator, pure copper, liquid ammonia, and high-purity carbon dioxide are taken as materials; a copper ammonia complexation solution is firstly prepared; and then the high-purity soda ash-type copper carbonate is prepared by the compound centrifugal film evaporator. Therefore, the production cycle is shortened; the product purity is higher; the yield is higher; and the production cost is lower.

Description

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

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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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