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Process for comprehensively treating and recycling acid waste gypsum

A technology for comprehensive treatment and waste gypsum, applied in the fields of environmental protection and chemical industry, can solve problems such as difficult control, untreated, environmental hazards, etc., and achieves lower thermal catalytic reduction temperature, good advancement and practicability, and reduced chemical oxygen demand. amount of effect

Active Publication Date: 2017-11-07
海若斯(北京)环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tail gas produced by the reaction of raw materials containing calcium sulfite and / or calcium sulfate with carbon-based reducing agents has not been treated, causing harm to the environment
[0008] The above technological achievements all involve the method of using waste gypsum as the main raw material to produce sulfur or calcareous raw materials, but there are problems such as high energy consumption, long time consumption, difficult control, and insufficient resource utilization to varying degrees.

Method used

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  • Process for comprehensively treating and recycling acid waste gypsum
  • Process for comprehensively treating and recycling acid waste gypsum

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Refer to the attached figure 1 , a process for comprehensive treatment and recycling of acidic waste gypsum, comprising the following steps:

[0045] (1) Dry acidic waste gypsum and carbonaceous material respectively, the moisture content after drying is 4%, and mix according to the molar mass ratio of carbon of carbonaceous material and calcium of acidic waste gypsum 3.5:1.

[0046] Wherein, the carbonaceous material selects activated carbon, and the mass fraction ω (C) of the elemental carbon content in the activated carbon is 85%; The acid waste gypsum is the mixture of industrial acid waste gypsum and the acid waste gypsum precipitate produced by step (4), The mass fraction of calcium sulfate content in acidic waste gypsum ω(CaSO 4 ) is 85%.

[0047] (2) The mixture of acidic waste gypsum and carbonaceous material is ball milled and sieved to obtain raw meal, and the particle size of the raw meal is 60 mesh.

[0048] (3) Feed the raw material into the thermal cra...

Embodiment 2

[0054] Refer to the attached figure 1 , a process for comprehensive treatment and recycling of acidic waste gypsum, comprising the following steps:

[0055] (1) acid waste gypsum and carbonaceous material are dried respectively, the moisture content of acid waste gypsum after drying is 3%, the moisture content of carbonaceous material is 2%, and according to the carbon of carbonaceous material and the calcium of acid waste gypsum The molar mass ratio is 1.5:1 for mixing.

[0056] Wherein, the carbonaceous material selection coke and petroleum coke are mixed according to any ratio, the mass fraction ω (C) of the elemental carbon content in the coke and petroleum coke mixture is 80%, and the acidic waste gypsum is the acidic waste produced by step (4). Gypsum deposits, the mass fraction ω(CaSO 4 ) is 80%;

[0057] (2) The mixture of acidic waste gypsum and carbonaceous material is ball milled and sieved to obtain raw meal, and the particle size of the raw meal is 20 mesh.

...

Embodiment 3

[0064] Refer to the attached figure 1 , a process for comprehensive treatment and recycling of acidic waste gypsum, comprising the following steps:

[0065] (1) Dry the acidic waste gypsum and carbonaceous materials respectively, and the moisture content after drying is ≤5%, and according to the carbonaceous materials

[0066] The molar mass ratio of carbon and calcium of acid waste gypsum is mixed in 5:1.

[0067] Wherein, the carbonaceous material selects carbon-containing waste residue, and the mass fraction ω (C) of carbon-containing waste residue is 90%; acid waste gypsum is a mixture of industrial acid waste gypsum and acid waste gypsum produced by step (4), and the acid waste The mass fraction of calcium sulfate content in gypsum ω (CaSO 4 ) is 90%.

[0068] (2) The mixture of acidic waste gypsum and carbonaceous material is ball milled and sieved to obtain raw meal, and the particle size of the raw meal is 100 mesh.

[0069] (3) Feed the raw meal into the thermal c...

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Abstract

The invention discloses a process for comprehensively treating and recycling acid waste gypsum and belongs to the fields of environmental protection as well as chemistry and chemical engineering. The process comprises the following steps: firstly mixing a carbonaceous material and acid waste gypsum in a certain ratio, and carrying out thermal cracking under anoxic condition, so that solid clinker is obtained; treating wastewater containing sulfuric acid with the solid clinker, so that waste gypsum and hydrogen sulfide gas are produced, carrying out organic phase catalytic treatment on the hydrogen sulfide gas to obtain a sulfur product, and recycling the waste gypsum again. The technology also comprises the steps of mixing one or more of the carbonaceous material, lime milk and quicklime when the solid clinker is recycled, putting acid wastewater, obtaining a mixture of the carbonaceous material and the acid waste gypsum and then participating in recycling. The process disclosed by the invention has the advantages that treatment efficiency is high, operation is stable, discharge is reduced, recycling is realized and a sulfur resource is obtained, so that wastewater-containing gypsum is subjected to harmless treatment, reduction and recycling.

Description

technical field [0001] The invention belongs to the fields of environmental protection and chemical engineering, and in particular relates to a process for comprehensive treatment and recycling of acidic waste gypsum. Background technique [0002] Acidic waste gypsum is a hazardous waste, generally mixed with organic matter and heavy metals. Generally, the disposal method of temporary stacking or landfill is adopted. Stacking will cause secondary pollution, high cost of landfill treatment, and serious waste of sulfur resources. Therefore, it is necessary to develop a new treatment process to recycle waste and make it harmless and resourceful. [0003] The invention patent with the application number 98101761.4 discloses a method for catalytic reduction of desulfurization waste residue, phosphogypsum or natural gypsum, using a composite compound of iron, nickel, magnesium, and sodium as a catalyst, and when the temperature is higher than 650°C, 95% The above calcium sulfate...

Claims

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Application Information

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IPC IPC(8): C01B17/04C02F1/00
CPCC01B17/0426C01P2006/80C02F1/001
Inventor 徐晶袁衍超林青山周世强严夏高敏杰
Owner 海若斯(北京)环境科技有限公司
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