Continuous production system and method for producing low-water-content calcium sulfate from waste sulfuric acid

A production system and production method technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problem of high energy consumption and achieve the effect of stable operation

Active Publication Date: 2020-07-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although the method can obtain anhydrous gypsum whiskers without water, additional drying treatment is required, and the energy consumption is relatively high

Method used

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  • Continuous production system and method for producing low-water-content calcium sulfate from waste sulfuric acid

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Embodiment 1

[0086] This embodiment provides a continuous production system for the production of low-water calcium sulfate from waste sulfuric acid. The structural schematic diagram of the continuous production system for the production of low-water calcium sulfate from waste sulfuric acid is figure 1 As shown, it includes a limestone slurry supply unit, a waste sulfuric acid supply unit, a quicklime slurry supply unit, a four-stage continuous reactor, a crystal modifier supply unit, a solid-liquid separation unit, and a tail gas absorption tower 13 .

[0087] The four-stage continuous reactor includes a first-stage reaction chamber, a second-stage reaction chamber, a third-stage reaction chamber and a fourth-stage reaction chamber arranged in sequence; the reactant in the first-stage reaction chamber flows to the second-stage reaction chamber , the reactant material in the second-stage reaction chamber flows to the third-stage reaction chamber, the reactant material in the third-stage rea...

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Abstract

The invention provides a continuous production system and method for producing low-water-content calcium sulfate from waste sulfuric acid. The continuous production system for producing the low-water-content calcium sulfate from the waste sulfuric acid comprises a limestone slurry supply unit, a waste sulfuric acid supply unit, a quick lime slurry supply unit, a four-stage continuous reactor, a solid-liquid separation unit and a tail gas absorption unit. The reaction process of the waste sulfuric acid, limestone and lime is accurately controlled, and a crystal modifier and a calcium sulfate seed crystal are added to regulate and control the particle size of calcium sulfate particles to obtain large-particle calcium sulfate crystals, so that the free water content of the gypsum product is lower than 10%, and the continuous reaction is ensured by using instrument control means such as an electromagnetic flowmeter, a pH online instrument and the like in the reaction process. The method has the advantages of no waste residue or waste liquid, up-to-standard emission of waste gas, clean and environment-friendly process, and provision of a new approach for resource utilization of waste sulfuric acid.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial hazardous waste, and relates to a system and method for producing calcium sulfate with waste sulfuric acid, in particular to a continuous production system and method for producing low-water calcium sulfate with waste sulfuric acid. Background technique [0002] A large amount of sulfuric acid is used in chemical, fuel, petroleum, pharmaceutical and other industries. The utilization rate of these sulfuric acids is low, and a large amount of sulfuric acid is discharged along with acid-containing wastewater. If these waste acids are discharged into the environment without treatment, not only will the water body Or soil acidification, causing harm to the ecological environment, and wasting a lot of resources. [0003] The treatment methods of waste sulfuric acid include evaporation concentration method, incineration method, neutralization method, extraction method, ion exch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
CPCC01F11/46C01P2006/82
Inventor 杨刚王云山安学斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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