The acid used in the acidolysis process often causes one of the reaction products to be acid gas, and the other to be new solid crystal;At the same time, the nucleation and growth conditions of the new solid phase crystallization must be considered to avoid the inclusion of ore particles by the new solid phase.For example, sulfuric acid decomposes phosphate rock to producecalcium superphosphateThe concentration of sulfuric acid should not be too high.otherwisecalcium sulfateThe dense thin shell is formed on the surface of mineral powder, so that the acidolysis reaction is incomplete.Different products can be produced due to different ratio of acid and mineral powder.For example, sulfuric acid decompositionilmeniteCan be generated due to different ratiosTitanium sulfateorTitanium oxysulfate。
The acidolysis process is usually irreversibleExothermic reactionThe decomposition rate is high, and the heat released can raise the material temperature, thus accelerating the reaction speed.Some acidolysis reactions have an initial reaction temperature, and then the reaction can be accelerated with the help of self heating, sulfuric acid decompositionilmeniteThis is an example.
Chinese name
Acidolysis
Alias
Acidolysis
Concept
mineralRaw material preparationInorganic productsA method of
The acidolysis equipment includes mechanical stirred tank reactor, air bubbling tank reactor, rotary drum reactor, plate leaching tower, thickening leaching reactor and spiral leaching reactor.The process can be carried out intermittently or continuously.
major factor
Announce
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The main factors affecting the acidolysis rate and acidolysis rate of minerals or salts are: ①granularity。The smaller the solid particle size, the higher the acidolysis rate and acidolysis rate. ②Temperature.When the temperature increases, most substancessolubilityThe viscosity of the solution decreases and the acidolysis rate increases with the increase of diffusion coefficient and diffusion coefficient.When the temperature is limited by the boiling point of acid solution, the acidolysis process must be carried out under pressure. ③stireffect.Mixing can increase the relative velocity of liquid-solid phase, reduce the diffusion resistance, and prevent particles from settling. ④Porosity.The greater the porosity of solid materials, the easier the acidolysis. ⑤Liquid solid ratio of suspension.The higher the liquid-solid ratio, the greater the relative velocity between the two phases, and the higher the acidolysis rate and acidolysis rate.
