Method for regulating and promoting growth of desulfurized gypsum crystals by using carbide slag-based desulfurizer

A technology for desulfurization gypsum and desulfurizer, which is applied in the field of resource recycling technology, can solve the problems of insufficient quality control of desulfurization gypsum, complicated process methods, gypsum crystal structure and particle size, moisture content and the influence of the back-end utilization process, etc. The number of nuclear particles, the effect of reducing the agglomeration of small particles

Active Publication Date: 2022-01-14
华能沁北发电有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]However, the process methods in the above-mentioned prior art are relatively complicated, and most of the processes are aimed at the process of generating desulfurized gypsum from the oxidation of calcium sulfite, while calcium carbide slag is used as a desulfurizer In the process, the quality con

Method used

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Comparison scheme
Effect test

Embodiment 1

[0026] A method for regulating and promoting the growth of gypsum crystals by a calcium carbide slag-based desulfurizer, comprising the following steps:

[0027] (1) Preparation of desulfurizer from carbide slag:

[0028] Carbide slag is pretreated to obtain a desulfurizer. After pretreatment, the calcium carbide slag product has a particle size of <105 μm, a particle ratio of 94.15%, a dry basis calcium oxide content of 72.05%, a Mg content of 0.3%, and a Si content of 0.8%;

[0029] (2) wet desulfurization:

[0030] The desulfurization slurry is prepared with a mass ratio of desulfurizer to water of 1:4, and the flue gas SO at the inlet of the desulfurization system 2 Concentration of 3500ppm, actual measurement of tail gas SO for 24 hours 2 The concentration is always lower than 20ppm, and polyethylene glycol with a desulfurizing agent mass of 0.005% is added to the desulfurization slurry. The appearance of the desulfurization gypsum is long rod, the particle size range i...

Embodiment 2

[0032] A method for regulating and promoting the growth of gypsum crystals by a calcium carbide slag-based desulfurizer, comprising the following steps:

[0033] (1) Preparation of desulfurizer from carbide slag:

[0034] Carbide slag is pretreated to obtain a desulfurizer. After pretreatment, the calcium carbide slag product has a particle size of <105 μm, a particle ratio of 91.08%, a dry basis calcium oxide content of 73.80%, a Mg content of 0.1%, and an Fe content of 0.5%;

[0035] (2) wet desulfurization:

[0036] The desulfurization slurry is prepared with a mass ratio of desulfurizer to water of 1:4, and the flue gas SO at the inlet of the desulfurization system 2 The concentration is 2600ppm, and the measured exhaust gas SO for 24 hours 2 The concentration is always lower than 15ppm, and 0.5% polyvinyl alcohol of the desulfurizing agent mass is added to the desulfurization slurry. The appearance of the desulfurization gypsum is thick and short rod, the particle size ...

Embodiment 3

[0038] A method for regulating and promoting the growth of gypsum crystals by a calcium carbide slag-based desulfurizer, comprising the following steps:

[0039] (1) Preparation of desulfurizer from carbide slag:

[0040] Carbide slag is pretreated to obtain a desulfurizer. After pretreatment, the calcium carbide slag product has a particle size of <105 μm, a particle ratio of 93.14%, a dry basis calcium oxide content of 74.32%, a Mg content of 0.4%, a Si content of 0.5%, and an Fe content of 0.1%;

[0041] (2) wet desulfurization:

[0042] The desulfurization slurry is prepared with a mass ratio of desulfurizer to water of 1:3, and the flue gas SO at the inlet of the desulfurization system 2 Concentration of 5000ppm, actual measurement of tail gas SO for 24 hours 2 The concentration is always lower than 25ppm. During the desulfurization process, 3.0% sodium polyacrylate is added as a desulfurizer. The appearance of the desulfurized gypsum is whisker-like, the particle size...

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Abstract

The invention belongs to the technical field of resource recycling processes, and particularly relates to a method for regulating and promoting growth of desulfurized gypsum crystals by using a carbide slag-based desulfurizer. The method comprises the following steps: (1) preparing the desulfurizer from carbide slag: pretreating the carbide slag to obtain the desulfurizer; and (2) performing wet desulfurization process: adding water into the desulfurizer obtained in step (1), pulping to prepare a desulfurization slurry, feeding the desulfurization slurry into a desulfurization reaction tower, carrying out contact reaction on the desulfurization slurry and sulfur-containing flue gas through a spraying system for desulfurization, adding an induced growth agent in the desulfurization process, controlling the particle size morphology of calcium sulfate crystals, and dehydrating to obtain the desulfurized gypsum. The calcium carbide slag-based desulfurizer with different impurity contents is used to achieve the gypsum induced crystal growth during the desulfurization process, the solid waste is adopted as the raw material, the process is simple, the flow is short, the secondary solid waste emission is avoided, the pollution problem of the calcium carbide slag is effectively solved, and the good economic and social values are provided.

Description

technical field [0001] The invention belongs to the technical field of resource recycling technology, and in particular relates to a method for regulating and promoting the crystal growth of desulfurized gypsum by a calcium carbide slag-based desulfurizer. Background technique [0002] Carbide slag is solid waste produced during the process of preparing acetylene from calcium carbide and water. The polyvinyl chloride (PVC) industry discharges 18 million tons of carbide slag every year. my country's energy structure is dominated by coal, and the flue gas emitted by coal combustion contains a large amount of SO 2 , Flue gas desulfurization consumes a large amount of primary limestone resources. Calcium hydroxide content in calcium carbide slag reaches 80% to 90%. After removing impurities, it can be used as a desulfurizer, which can greatly reduce the pollution caused by sulfur dioxide and improve the utilization efficiency of calcium carbide slag. [0003] When calcium carb...

Claims

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Application Information

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IPC IPC(8): C04B11/26C01F11/46
CPCC04B11/264C01F11/46
Inventor 张道瑞杨喜山周少湘邢兆龙王玉龙高达李建高邢岗金大虎王兴国王秋剑杨靖李会泉李少鹏朱干宇颜坤孟子衡
Owner 华能沁北发电有限责任公司
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