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Calcium hydroxide (hydrated lime) refers to a powdery product obtained by reacting quicklime with (controlled) quantitative water, generally containing less than 1% free water. At temperature below 350℃: CaO+H2O →Ca(OH):+276(kcal /kg CaO) In the 1980s, high specific surface area calcium hydroxide was mainly used to remove acidic gases from waste gas. Obviously, increasing the surface area of calcium hydroxide is conducive to improving efficiency. Therefore, people began to study and develop high specific surface area calcium hydroxide, which is widely used in the synthesis of medicine and food additives, the synthesis of high-tech biomaterials HA, the synthesis of feed additives VC phosphate, food konjac, calcium synthesis, and the synthesis of calcium cyclohexane acid, calcium lactate, calcium citrate, cola additives and other high-end organic chemicals. Surface area determination method: (1) BET method to measure specific surface area: (2) Measure total pore volume and pore size distribution; (3) Measure particle size and distribution; (4) Electron microscope to observe particle morphology. There are currently two methods for producing high specific surface area calcium hydroxide: one is to obtain calcium hydroxide with a specific surface area of up to 30m2/g from lime milk by drying and grinding (referred to as wet method); the other...

We are proud to be part of the cause in reducing CO2 from the atmosphere. The hydrator is going to be used in a carbon capture plant in US. The client will use the hydrator to turn CaO to Ca(OH)2 that will absorb CO2 from air and then turn into CaCO3, the CaCO3 is then calcined in a kiln powered by green energy(solar/wind,etc.) while releasing the trapped CO2 in it. During the process, the released CO2 is captured and injected deep underground or into concrete for permanent storage. Carbon Capture Process:  CaCO3+heat ⇒ CaO+CO2(captured), CaO+H2O ⇒ Ca(OH)2,  Ca(OH)2+CO2(from air) ⇒ CaCO3 ↵  

Depends on the quality of quicklime and classifier output fineness, there is usually more than 5% to 10% grits or residues discharged from the classifier, this is mostly over-burnt  & under-burnt limestones that are not reactive. These rejects from classifier are usually dumped, milled and mixed in the hydrated lime powder or milled and stored separately. In case of grit milling, there are several different types of mill that can be used: – Raymond mill: Raymond mill is most commonly used in China. it is suitable when the grits doesn’t contain much powder, namely output fineness of classifier not very high. Raymond mill has a built-in classifier, so milling sizes can be controlled easily, the mill output can be stored separately or mixed in the hydrated lime. – Ball mill: Ball mill is very flexible with various feed quality, it can be used to mill grits or powder. It’s very convenient to install a ball mill when the milled rejects are ultimately mixed into the hydrated lime. In this case, the mill output and hydrated lime could share the one classifier, no need for a second classifier. If the milled grits are to be stored separately, then a second classifier...

In order to improve and optimize the lime hydration process equipment and increase the conversion rate of calcium oxide(quicklime) to calcium hydroxide(hydrated lime), experiments were conducted on the effects of different quicklime sizes and hydration water temperature on the hydration time of locally produced lime in Jiande area. 1. Effect of quicklime sizes on hydration time The experimental results are shown in Table 1. It can be seen from the data in Table 1 that the larger the l quicklime size, the longer the hydration time; the smaller the quicklime size, the shorter the hydration time. The effect of quicklime sizes on hydration time is shown in Figure 2          Table 1: the effect of quicklime size on hydration time Quicklime size /mm Hydration time /s Total temperature rise /oC 0.15 50 100 70 110 5 60 100 80 110 10 65 100 89 110 2. Effect of hydration water temperature on lime hydration time. Locally produced lime with a particle size of 10~15mm was used for hydration with water of different temperatures. The experimental data are shown in Table 2. Experimental data shows that during the hydration process of lime, the water temperature directly affects the...

Lime Hydration Mechanism Quicklime mixed with water produces calcium hydroxide. The mixing reaction produces Ca2+ and OH–, from which solid phase calcium hydroxide crystallizes. The lime hydration reaction mechanism is as follows: CaO +H2O →Ca(OH)2 Ca(OH)2 →  Ca2+ +2OH–(solid surface) Ca2+ +2OH– → Ca(OH)2 (crystal) At the beginning of the reaction, under low agitating intensity, the entire hydration process is mainly controlled by the main liquid phase diffusion process of Ca+ or OH– on the CaO solid surface. As the agitation intensity increases, the influence of the chemical reaction begins to increase, driven by both diffusion and reaction. Because as the agitation rate increases, the diffusion liquid film on the solid surface becomes thinner, speeding up the diffusion rate of the reaction product, causing the apparent hydration rate of lime to increase accordingly, and the hydration process begins to be dominated by both diffusion and reaction. It is well known that the main factors affecting the hydration rate are agitation, quicklime particle size and hydration water temperature. 1.)The impact of agitation on the lime hydration process: Agitation intensity is a critical value. It must not only fully mix quicklime and water to prevent lime from agglomerating, but also reduce the heat loss of...

If you interested in the prices of a hydrated lime plant, below are the main factors you should consider first. 1.) Plant capacity on hourly basis: Capacity is the most important factor affecting your total investment. You should decide what is the hourly capacity you need taking in account of your kiln capacity or market demand. 2.) Plant layout: Plant layout has significant impact on your total investment. Keeping it simple by sacrificing flexibility can save quite a lot of money on the equipment and infrastructure. it’s all about what is most suitable for you. 3.)Quality of quicklime and desired quality of hydrated lime powder:  Quality of quicklime has signifcant impact on the output capacity and quality. Producing with poorer quality materials will increase your costs. Please contact us for detailed proposals or offers if you are in need of a hydrated lime plant.