A continuous production system and method for producing low-water calcium sulfate from waste sulfuric acid

A production method, production system technology

Active Publication Date: 2021-05-07
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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  • A continuous production system and method for producing low-water 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 calcium sulfate from waste sulfuric acid. The continuous production system for producing low-water calcium sulfate from waste sulfuric acid includes a limestone slurry supply unit, a waste sulfuric acid supply unit, and quicklime slurry. Supply unit, four-stage continuous reactor, solid-liquid separation unit, and tail gas absorption unit; the invention precisely controls the reaction process of waste sulfuric acid, limestone and lime, and adds crystal modifier and calcium sulfate seed to regulate the particle size of calcium sulfate to obtain large Granular calcium sulfate crystals make the free water content of the gypsum product less than 10%. The reaction process uses electromagnetic flowmeters, pH online instruments and other instrument control methods to ensure continuous reaction. The invention has no waste slag and waste liquid, discharges the waste gas up to the standard, the process is clean and environment-friendly, and provides a new way 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 Patents(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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