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A salt salt system brine evaporation production process of salt salt

A salt nitrate and system technology, applied in the directions of alkali metal sulfite/sulfite, inorganic chemistry, chemical instruments and methods, etc. Meet the effect of environmental protection

Active Publication Date: 2022-04-08
CHINA LIGHT IND INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Known methods for producing sodium chloride and sodium sulfate by the salt nitrate system include the independent recovery method of evaporating salt production mother liquor and the discharge method of evaporation nitrate production mother liquor, but the independent recovery method of evaporating salt production mother liquor requires setting an independent recovery system, which can High consumption and complicated process flow, and among them, the mother liquor discharge method of nitrate production by evaporation has the problem of improving the recovery rate of raw materials and avoiding the impact on the environment

Method used

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  • A salt salt system brine evaporation production process of salt salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: take 70m 3 Salt salt brine raw material (NaCl 305g / l, NaCl 2 SO 4 50g / l) is preheated with evaporative condensed water (temperature 50°C) and the mother liquor is discharged into effect II, III, and VI of the salt salt nitrate evaporator by advection at the equilibrium temperature of the mother liquor mixed with brine respectively. 30.5 tons of sodium chloride product and 288.18m 3 / h low-temperature salt nitrate co-saturated salt production mother liquor (NaCl 287g / l, NaCl 2 SO 4 68g / l), the evaporation temperature is 50-90°C, the first effect, the second effect, and the third effect of the salt salt evaporation plant lead out the secondary steam, and the first effect condensate is sent to the circulation pump single-pass series preheater system; 288.18m 3 / h salt making mother liquor (NaCl287g / l, NaCl 2 SO 4 68g / l) preheated by the circulating pump single-pass series preheater system and the 30m preheated by evaporative condensate 3 Salt salt b...

Embodiment 2

[0016] Embodiment 2: take 86m 3 Salt salt brine raw material (NaCl 300g / l, NaCl 2 SO 4 20g / l) is preheated with evaporative condensed water (temperature 50°C) and respectively discharged from effect I, II, III, VI, and V to the equilibrium temperature of the mother liquor mixed with brine into the salt-making nitric acid evaporator II effect, III effect, 30 tons of sodium chloride product and 114.94m 3 / h low temperature salt nitrate co-saturated salt production mother liquor (NaCl287g / l, NaCl 2 SO 4 68g / l), the evaporation temperature of salt production is 110-50°C, the first effect, the second effect, the third effect, the sixth effect and the fifth effect of the salt making nitric acid evaporation device lead to the secondary steam, and the first effect condensate is sent to the single-pass serial series preheater of the circulating pump System; 114.94m 3 / h salt making mother liquor (NaCl 287g / l, NaCl 2 SO 4 68g / l) after being preheated by the circulating pump si...

Embodiment 3

[0017] Embodiment 3: take 82m 3 Salt salt brine raw material (NaCl 290g / l, NaCl 2 SO 4 35g / l) is preheated with evaporative condensed water (temperature 50°C) and respectively discharged from effect I, effect II, effect III and effect VI to the equilibrium temperature of the mother liquor and brine into the salt making nitric acid evaporator effect II, effect III, effect VI, effect advective 29 tons of sodium chloride products and 201.15m 3 / h low-temperature salt nitrate co-saturated salt production mother liquor (NaCl 287g / l, NaCl 2 SO 4 68g / l), the evaporation temperature of salt production is 110-50°C, and the first effect, second effect, third effect, and sixth effect of the salt production nitric acid evaporation device lead out the secondary steam, and the first effect condensate water is sent to the circulation pump single-pass series preheater system; 201.15 m 3 / h salt making mother liquor (NaCl 287g / l, NaCl 2 SO 4 68g / l) after being preheated by the circul...

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Abstract

A process for producing salt nitrate by evaporating salt nitrate system brine, using salt nitrate system brine as raw material, part of the raw material is preheated by evaporative condensed water, advectively enters the salt nitrate evaporator, and balances the flash heat of each high-temperature mother liquor. Evaporation and crystallization separation from the first effect to the final effect evaporator to obtain sodium chloride product and low-temperature salt nitrate co-saturated salt mother liquor; lead out secondary steam and first effect condensate from each effect of the salt nitrate evaporation device to the single-pass series series preheater system of the circulating pump The preheated salt-making mother liquor is mixed with another part of raw materials, and enters the first-effect evaporation tank of the salt-making nitric acid evaporator to evaporate and separate to obtain sodium sulfate product and high-temperature salt nitrate co-saturated nitrate-making mother liquor, and the nitrate-making mother liquor is transferred to the salt-making nitric acid The second effect of the evaporator is to recycle sodium chloride through cooling, evaporating and crystallizing. The invention has the advantages of concise and reasonable technological process, high quality of main and by-products, strong adaptability of raw materials, low energy consumption of steam, and zero discharge of brine closed-circuit circulation.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, in particular to a process for producing salt nitrate by evaporating brine in a salt nitrate system. Background technique [0002] Known methods for producing sodium chloride and sodium sulfate by the salt nitrate system include the independent recovery method of evaporating salt production mother liquor and the discharge method of evaporation nitrate production mother liquor, but the independent recovery method of evaporating salt production mother liquor requires setting an independent recovery system, which can The problems of high consumption and complex process flow, and the discharge method of mother liquor for nitrate production by evaporation have the problems of improving the recovery rate of raw materials and avoiding the impact on the environment. Contents of the invention [0003] The object of the present invention is to provide a process for producing salt nitr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/08C01D5/00
Inventor 彭赛军彭美凡
Owner CHINA LIGHT IND INT ENG CO LTD