Method for preparing hydrochloric acid by utilizing hydrogen chloride gas in the process of producing potassium sulfate by Mannheim method
A Mannheim process, potassium sulfate technology, applied in chloride preparation, sulfate/bisulfate preparation, chlorine/hydrogen chloride, etc., can solve the problems of low quality, economic loss of enterprises, and high impurity content of hydrochloric acid
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[0040] Example 1:
[0041] The flow rate of deionized water for scrubbing the gas of the four-stage scrubber is 14.8 L / min, the internal circulation is 100 L / min, and the output of hydrochloric acid A is 30.1 tons / day. The flow rate of deionized water for washing environmentally friendly exhaust gas is 0.7 L / min, and the output of mixed solids obtained from spraying waste liquid is 294 kg / day.
[0042] The quality of the tested hydrochloric acid A is shown in Table 3 below:
[0043] projectSulfate (SO 4 2- ,%)
[0044] table 3
[0045] The content of hydrogen chloride in the tail gas: 5.17mg / m 3 , In line with environmental protection emission standards.
Example Embodiment
[0046] Example 2:
[0047] The flow rate of deionized water for scrubbing the gas of the four-stage scrubber is 13.2 L / min, the internal circulation is 115 L / min, and the output of hydrochloric acid A is 28.0 tons / day. The flow rate of deionized water for washing the environmentally friendly exhaust gas is 2.6 L / min, and the output of mixed solids obtained from spraying waste liquid is 299 kg / day.
[0048] The quality of the tested hydrochloric acid is shown in Table 4 below:
[0049] projectSulfate (SO 4 2- ,%)
[0050] Table 4
[0051] The content of hydrogen chloride in the tail gas: 4.93mg / m 3 , In line with environmental protection emission standards.
Example Embodiment
[0052] Example 3:
[0053] The flow rate of deionized water for scrubbing the gas in the four-stage scrubber is 14.8 L / min, the internal circulation is 135 L / min, and the output of hydrochloric acid A is 29.3 tons / day. The flow rate of deionized water for washing environmentally friendly exhaust gas is 3.0 L / min, and the output of mixed solids obtained from spraying waste liquid is 301 kg / day.
[0054] The quality of the tested hydrochloric acid A is shown in Table 5 below:
[0055] project Sulfate (SO42-,%) Fe3+(%) HCl(%) colour Hydrochloric acid A0.0070.000432.4 colorless
[0056] table 5
[0057] The content of hydrogen chloride in the tail gas: 4.98mg / m 3 , In line with environmental protection emission standards.
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