Device and process for recycling waste sulfuric acid
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A technology for recovery and treatment of waste sulfuric acid, which is applied in the direction of magnesium sulfate, bisulphate preparation, sulfate/bisulfate preparation, etc., can solve problems such as improper process, different sources of waste acid, complex components, etc., and achieve low-cost recycling Effect
Active Publication Date: 2020-04-07
山东齐创石化工程有限公司
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Problems solved by technology
However, due to the different sources of waste acid, the complex composition is different from the production of various sulfates from commercial sulfuric acid
A small amount of organic matter and other components in waste acid have a great impact on the production of sulfate, especially the removal of a small amount of impurities. The existence of a small amount of impurities has a great impact on the salt formation, crystallization, and product quality of sulfuric acid. It is difficult to produce qualified products if the process is improper.
[0008] Due to the different sources of waste sulfuric acid, the composition and ratio of substances in the waste sulfuric acid are different. The waste sulfuric acid encountered by the applicant contains 75-80% sulfuric acid, 5-10% potassium bisulfate, 0.2-0.5% If boron trifluoride and other organic substances are directly recovered from potassium hydrogen sulfate, the crystallization and separation conditions are harsh, the separation is difficult, and the equipment investment is huge, so it is not economically feasible.
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Embodiment 1
[0031] A method for recovering and treating waste sulfuric acid. The waste sulfuric acid contains 75-80% sulfuric acid, 5-10% potassium bisulfate and 0.2-0.5% boron trifluoride. The treatment method comprises the following steps:
[0032] S1: Transfer waste sulfuric acid to the defluorination reactor, add defluorination additives for defluorination pretreatment; Harmless fluoride. The waste acid is accurately metered into the defluorination reactor, and the defluorination aid is added through the control system according to the analysis data, and the defluorination waste acid enters the reactor.
[0033] S2: Transfer the pretreated waste sulfuric acid to the reactor, add magnesium oxide into the reactor, react until the pH value reaches neutral, add iron remover and flocculant while stirring, continue the reaction, add iron remover and Flocculation makes iron and other impurities form precipitates, removes iron and most of the impurities, and the tail gas discharged from the ...
Embodiment 2
[0040] A recovery and treatment device for waste sulfuric acid, comprising a waste sulfuric acid storage tank 1, a defluorination reactor 2, an absorption tower 3, a reaction kettle 4, a filter press 5, activated carbon filter equipment 6, a first crystallization kettle 7, a first centrifugal separation machine 8, the second crystallization kettle 9, mother liquor transfer tank 10, the second centrifuge 16, waste residue storage tank 11, the first dryer 12, magnesium sulfate storage tank 13, the second dryer 14 and magnesium sulfate potassium storage tank 15. The reaction kettle 4 is a reaction kettle 4 with a stirring function, and the reaction kettle 4 is also provided with an iron removal agent feeding port and a flocculant feeding port. Both the first centrifugal separator 8 and the second centrifugal separator 16 are automatic continuous separators.
[0041] The waste sulfuric acid storage tank 1 is used to store the waste sulfuric acid to be recovered, the defluorinatio...
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Abstract
The invention relates to a method for recycling waste sulfuric acid. The method comprises the following steps: S1, carrying out defluorination pretreatment on waste sulfuric acid; S2, transferring thewaste sulfuric acid into a reaction kettle, and adding magnesium oxide for reaction; S3, carrying out filter pressing on a reaction liquid, transferring waste residues to a waste residue storage tank, and transferring filtrate to activated carbon filtering equipment; and S4, separating a magnesium sulfate mother liquor through a first crystallization kettle, detecting the content of potassium hydrogen sulfate, and determining whether the mother liquor is continuously circulated or recycled after potassium hydrogen sulfate is recycled according to whether the content of potassium hydrogen sulfate in the mother liquor reaches a preset threshold value or not. According to the method and the device, the recovery of potassium hydrogen sulfate in the waste sulfuric acid can be realized; the mother liquor is circularly purified, when the concentration of potassium hydrogen sulfate in the mother liquor does not reach a threshold value, the mother liquor flows back to the reaction kettle to continue to increase the concentration of potassium hydrogen sulfate in the mother liquor, and when the concentration of potassium hydrogen sulfate in the mother liquor reaches the threshold value, themother liquor is transferred to the crystallization kettle, the magnesium oxide is added, potassium magnesium sulfate is generated, separated and discharged, and the low-cost recovery of potassium hydrogen sulfate in the waste sulfuric acid is achieved.
Description
technical field [0001] The invention relates to the technical field of waste acid recovery, in particular to a waste sulfuric acid recovery treatment device and process. Background technique [0002] The annual production of waste sulfuric acid in China exceeds 30 million tons. Most of the waste sulfuric acid contains organic matter and cannot be used directly. The existing technology for treating waste sulfuric acid from organic matter is mainly to crack and regenerate sulfuric acid for reuse. The investment in equipment is huge, and the cost per ton of waste sulfuric acid is extremely high. High production costs and huge losses have brought great pressure on the cost and environment of production enterprises, and are the biggest problems plaguing the production of enterprises. Others include extraction and other treatment processes, which involve the cost of extraction solvent recovery and low sulfuric acid content. Few enterprises apply them. Therefore, seeking economical...
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