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Method for preparing carbonated cementing material from carbide slag

A technology of carbonated glue and carbide slag, applied in carbon capture, cement production and other directions, can solve the problems of high disposal cost, slight odor of carbide slag, hidden dangers, etc., and achieve the effects of low preparation cost, simple method and easy operation.

Inactive Publication Date: 2019-08-09
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, calcium carbide slag is mainly used as an alternative raw material for limestone or lime, such as replacing limestone in the production of cement and as a wet desulfurizer, replacing lime in the production of wall materials and plastering putty, and producing light calcium carbonate instead of lime. Carbide slag has been used in some applications, but because it contains a small amount of toxic substances, the carbide slag has the characteristics of slight odor and high impurity content. Enterprises still have a headache to solve the pollution problem of carbide slag accumulation and landfill and the pressure of environmental protection
[0005] So far, the research and practice of preparing cementitious materials from calcium carbide slag at home and abroad is mainly to use calcium carbide slag to replace limestone ingredients, calcined and powdered to produce cement cementitious materials, or to replace lime as cementitious materials for lime mortar / lime cement mortar, while using calcium carbide slag There has not been any practice or research report on the preparation of cementitious materials by slag carbonation
[0006] On the other hand, the carbon dioxide capture and storage (CCS) system led by governments and environmental experts has gradually moved from policy to implementation. A large amount of carbon dioxide will be captured from industrial kiln flue gas and buried in deep sea or geological depths. However, this method of carbon dioxide storage and treatment has objectively hidden dangers that are difficult to predict, and the disposal cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Select new wet acetylene carbide slag from a salinization enterprise (moisture content 37.9%, peculiar smell, gray black), commercially available canned liquid carbon dioxide, commercially available chlorine dioxide oxidant, and prepare calcium carbide slag from calcium carbide slag according to the following steps Carbonated gelling material:

[0029] (1) Slurry detoxification and odor removal: Add water to calcium carbide slag under normal pressure at 2°C to make a suspension slurry with a water / solid ratio of 5:1, and add chlorine dioxide oxidant dropwise under continuous stirring until the odor The odor is completely eliminated, and the effective dosage of chlorine dioxide oxidizing agent is 0.009% of the mass of carbide slag to obtain a non-toxic suspension slurry;

[0030] (2) Carbide slag bicarbonation: put the non-toxic suspension slurry obtained in step (1) in a pressure stirred tank, press into the carbon dioxide captured by industrial carbon at a temperature o...

Embodiment 2

[0034] Select the acetylene carbide slag yard slag (moisture content 31.4%, peculiar smell, gray) of a salinization enterprise, carbon dioxide captured by a carbon washing tower of a certain enterprise, self-made potassium ferrate oxidant, and prepare calcium carbide from the calcium carbide slag according to the following steps Slag carbonated gelling material:

[0035] (1) Slurry detoxification and odor removal: Add water to calcium carbide slag under normal pressure at 12°C to make a suspension slurry with a water / solid ratio of 9:1, and add potassium ferrate oxidant dropwise under continuous stirring until the odor The odor is completely eliminated, and the effective dosage of potassium ferrate oxidizing agent is 0.007% of the quality of carbide slag, and a non-toxic suspension slurry is obtained;

[0036] (2) Carbonation of calcium carbide slag: put the non-toxic suspension slurry obtained in step (1) in a pressure stirring tank, press into the carbon dioxide captured by ...

Embodiment 3

[0040] Select a company's dry acetylene carbide slag yard slag (moisture content 5.2%, has a peculiar smell, off-white), carbon dioxide captured by a carbon capture demonstration line of a power plant, self-made sodium ferrate oxidant, and prepare calcium carbide from calcium carbide slag according to the following steps Slag carbonated gelling material:

[0041] (1) Slurry detoxification and odor removal: Add water to calcium carbide slag under normal pressure at 20°C to make a suspension slurry with a water / solid ratio of 11:1, and add sodium ferrate oxidant dropwise under continuous stirring until the odor The odor is completely eliminated, and the effective dosage of sodium ferrate oxidant is 0.009% of the mass of carbide slag to obtain a non-toxic suspension slurry;

[0042] (2) Carbonation of calcium carbide slag: put the non-toxic suspension slurry obtained in step (1) in a pressure stirring tank, press into the carbon dioxide captured by industrial carbon at a temperat...

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Abstract

The invention relates to a method for preparing a carbonated cementing material from carbide slag. The method comprises the following steps of 1, pulping, toxicity removal and peculiar smell removal;2, hydrogen carbonating of the carbide slag, wherein non-toxic suspension slurry obtained in step 1 is placed in a pressure stirring tank to press in carbon dioxide, under the condition of maintainingthe CO2 pressure state, Ca(OH)2 and CaCO3 crystal minerals in the carbide slag are converted into a water-soluble Ca(HCO3)2 super-saturated solution, and the material is obtained. The method is easyto operate and free of secondary pollution; the main raw materials are the industrial waste slag, namely the carbide slag and CO2 captured by carbon capture and emission reduction projects, and the preparation cost is relatively low.

Description

technical field [0001] The invention relates to a preparation method of a cementitious material, in particular to a method for preparing a carbonated cementitious material by utilizing calcium carbide slag. Background technique [0002] Carbide slag is an industrial waste produced after the hydrolysis of calcium carbide to produce acetylene gas. Its pH value is greater than 12, and it has strong alkalinity and adhesion. Because the main component of calcium carbide for industrial use is calcium carbide, its content is about 70%-86%, and the remaining components are free calcium oxide, carbon, silicon, magnesium, iron, aluminum compounds and a small amount of phosphide, sulfide and heavy metals Compound, its appearance color is gray, brown, purple or black depending on the content of calcium carbide and different impurities. Therefore, calcium carbide slag is off-white to dark gray because it contains 1-3% carbon and a certain amount of sulfur, silicon, aluminum, iron, magne...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B12/00
CPCC04B7/24C04B12/005Y02P40/10Y02P40/18
Inventor 尹小林
Owner 长沙紫宸科技开发有限公司