Equipment and method for dissolving nitrate solution

Abstract

The invention discloses equipment for dissolving a nitrate solution. Nitrate comprises nitrate ions and metal ions. The nitrate liquor is dissolved by the equipment to obtain a nitric acid solution and metallic oxides. The equipment comprises a concentration device, a calcination device and an absorption device. The concentration device is used for concentrating stock solutions, the calcination device is used for calcinating second concentrated solutions, and the absorption device is used for absorbing nitric acid in acid gases. The concentration device comprises a first filter, a second filter and an evaporation and concentration device. The ratio of filtration media of the first filter to the molecular weight is larger than or equal to interception rate of 1000 substances which is larger than or equal to 99%. The ratio of filtration media of the second filter to the molecular weight is larger than or equal to the interception rate of 100 substances which is larger than or equal to 99%. A first filtrate outlet of the first filter is communicated with a liquid inlet of the second filter. A first concentrated-solution outlet of the second filter is communicated with a liquid inlet of the evaporation and concentration device. A second concentrated-solution outlet of the evaporation and concentration device is communicated with a liquid inlet of the calcination device. An acid-gas outlet of the evaporation and concentration device is communicated with a gas inlet of the absorption device.

Description

technical field [0001] The invention relates to the technical field of nitrate solution decomposition, in particular to a device and method for decomposing nitrate solution. Background technique [0002] Magnesium nitrate solution is produced during nickel production. According to statistics, under the condition of an annual output of 10 million tons of nickel, 170,000 tons of magnesium nitrate dilute solution will be produced. Both magnesium oxide and nitric acid solution are auxiliary materials needed in the production process, so the recycling of resources can be truly realized by processing magnesium nitrate solution to obtain magnesium oxide and nitric acid solution. [0003] Traditional equipment for decomposing magnesium nitrate such as figure 1 As shown, the specific process is as follows: first, use the evaporation concentrator 4 to concentrate the stock solution, and then use the roasting device 5 to roast the concentrated stock solution to obtain magnesium oxide...

AI Technical Summary

Problems solved by technology

[0010] The main purpose of the present invention is to provide equipment and methods for decomposing nitrate solution, to solve the problems of high energy consumption, low product recovery and poor purity in the prior art

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