Production process of temperature-controlled cyclic layer-by-layer sodium nitrate separation

Abstract

The invention discloses a production process of temperature-controlled cyclic layer-by-layer sodium nitrate separation. The production process comprises the following steps: soaking nitronatrite ore with water to form a three-salt system liquid of sodium chloride NaCl, sodium nitrate NaNO3 and sodium sulfate Na2SO4; producing sodium chloride by low-temperature salt slurry whirl in the heating treatment process; extracting sodium sulfate from high-temperature salt slurry by virtue of a liquid-liquid separator; and returning a mother liquid to an evaporation system to use in cycle, and gradually separating and washing a salt slurry separator, so that heat energy is reduced; the water consumption is reduced; industrial pollution is reduced; the production process is mainly applied to comprehensive utilization of nitronatrite ore resources; production of the sodium nitrate is achieved; by-production of the sodium chloride and the sodium sulfate is achieved; waste salt is divided into two products, namely the sodium sulfate and the sodium chloride, so that the production value is increased; and the comprehensive economic benefits are improved.

Description

technical field [0001] The invention relates to an IPC international patent classification C01D alkali metal compound separation technology, especially a production process for layer-by-layer separation of salt and nitrate in a temperature-controlled cycle. Background technique [0002] With the gradual maturity of the domestic sodium nitrate production process, the maximization of mineral development benefits will increase the advantages for enterprises to participate in market competition. The extraction operation of sodium sulfate, sodium chloride, and sodium nitrate in sodium nitrate mines is maximized, compared with the past when only nitric acid is extracted. The antiquated practice of sodium creates favorable conditions for enterprises to reduce production costs. [0003] At present, in order to reduce the entrainment of sodium nitrate in the waste salt, a large amount of washing water enters the centrifugal system, which increases unnecessary energy consumption for t...

AI Technical Summary

Problems solved by technology

Several sets of salt and nitrate co-generation production devices with an annual production capacity of 100,000 tons, 200,000 tons and 300,000 tons have been introduced in China. The operation is basically stable, but the energy consumption is relatively high

Images