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Methods and systems for utilizing carbide lime

A technology of lime and calcium carbide, applied in chemical instruments and methods, cement production, preparation of alkali metal carbonate shapes, etc., can solve problems such as environmental hazards and high economic costs

Active Publication Date: 2015-04-01
ARELAC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If left unaddressed, the effects of climate change and ocean acidification are likely to be economically costly and harmful to the environment

Method used

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  • Methods and systems for utilizing carbide lime
  • Methods and systems for utilizing carbide lime
  • Methods and systems for utilizing carbide lime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0303] Purification of calcium carbide lime, formation and transformation of precipitated material

[0304] 1.88kg of NH 4 Cl was dissolved in 20.0L tap water. To this solution was added 1.18 kg carbide lime (~85% Ca(OH) 2 ), and mixed for 2 hours. The resulting mixture was vacuum filtered to remove insoluble impurities. Transfer the clarified filtrate to an airtight, collapsible bag. The bag was submerged in a water bath which preheated the solution to 35°C. The carbonation reactor is an acrylic cylinder equipped with baffles, gas diffusers, pH electrodes, thermocouples, turbine impellers, and liquid, gas, and slurry inlets and outlets. Mass flow controller controls N 2 -CO 2 Inlet gas mixing ratio. At start-up, 1 L of the solution in the bag was pumped into the reactor. Introducing CO through a gas diffuser 2 and N 2 While mixing the gas mixture, stir the mixture. A computer-automatically controlled loop controls a continuous input flow of fresh reactant solution...

Embodiment 2

[0307] Purification of calcium carbide lime and formation of precipitated material

[0308] 35.05g glycine (NH 2 CH 3 COOH) was dissolved in 1000 g deionized water. To this solution was added 17.30 g of calcium hydroxide (Ca(OH) 2 ). The mixture was stirred for 30 minutes. The mixture was vacuum filtered through Whatman No. 1 filter paper. At a temperature of 21.5°C, the pH of the resulting filtrate was 10.87. The filtrate was transferred to a 1 liter (4.5" inner diameter) batch reactor vessel with baffles. The filtrate was mixed with a 1.5" diameter rushton impeller at 2500 rpm while being fed with 1 slpm of carbon dioxide (CO 2 ) and 2slpm nitrogen (N 2 ) is bubbled through the reactor. When the pH reached 7.5 after 11 minutes and 25 seconds, the mixing and gas sparging was stopped. The resulting slurry was vacuum filtered through Whatman No. 1 filter paper. The solid filter cake was dried overnight at 100°C. 15.52 g of dry solid were recovered. The solid showed ...

Embodiment 3

[0310] Effect of Additives on Preparation of Aragonite Precipitated Materials with Low Density and High Porosity

[0311] In this experiment, an admixture was added to a precipitated material containing reactive vaterite to form a low-density and high-porosity aragonite microstructure suitable for lightweight and insulating applications such as drywall and ceiling tiles.

[0312] By capturing CO from flue gas 2 to produce calcium carbonate cement. In this process, in the absorber, the CO-containing 2 The raw flue gas is contacted with an alkaline aqueous solution to form a carbonated solution. Then, the carbonated solution was mixed with CaCl 2 Aqueous solution contact and add NaSO 4 acts as a stabilizer, leading to the metastable state of CaCO 3 Precipitation in the form of vaterite, followed by dehydration and drying of the precipitate yields the final carbonate precipitation material powder. The carbonate precipitation material showed 83% by weight vaterite and 17% by...

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Abstract

Methods and systems are provided for producing a carbonate precipitation material comprising stable or reactive vaterite from carbide lime that provides both a source of divalent cations (Ca divalent cations, Mg divalent cations, etc.) and a source of proton removing agent. A method of forming drywall, comprising a) contacting an aqueous solution comprising carbide lime with carbon dioxide from an industrial process; b) producing a precipitation material comprising reactive vaterite; c) setting and hardening the precipitation material by transforming the reactive vaterite to aragonite, and d) forming the drywall.

Description

[0001] cross reference [0002] This application claims priority to US Provisional Patent Application No. 61 / 617,243, filed March 29, 2012, which is hereby incorporated by reference in its entirety. Background technique [0003] carbon dioxide (CO 2 ) emissions have been identified as the main cause of global warming. CO 2 is a by-product of combustion and causes operational, economical and environmental problems. It can be expected that CO 2 Increased atmospheric concentrations of GHGs and other greenhouse gases will promote greater heat storage in the atmosphere, leading to increased surface temperatures and rapid climate change. In addition, due to CO 2 dissolution and formation of carbonic acid, atmospheric CO 2 Rising levels could also further acidify the world's oceans. The effects of climate change and ocean acidification are likely to be economically costly and environmentally harmful if left unaddressed. Reducing the potential risk of climate change may requi...

Claims

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Application Information

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IPC IPC(8): C08B3/26C04B11/28C01D7/38
CPCC04B28/10C04B2/005C04B2111/00758C01F11/182C01F11/183C01F11/185C01P2004/61C01P2006/80Y02P40/18C04B7/345C04B7/36
Inventor M·德维尼M·费尔南德斯I·陈纪尧姆·卡拉斯
Owner ARELAC INC
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