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limestone calcium hydroxide machine

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calcium hydroxide mill & production line from hongcheng

Raw materials: Limestone. Fineness of the finished product: 325 mesh D96. Equipment model and number: 2 sets of HC1700. Annual output of equipment: 140,000 tons (2 sets). Customer Reviews: "I have been cooperate with Guilin Hongcheng for many times, we are very satisfied, Hongcheng's desulphurization equipment was as fortress with high technical content, fast service efficiency, equipment system optimization and upgrading speed is also very fast, it can follow the industry development demand, each link of the control efforts are in place, has brought very considerable benefits for our company. Thank you very much for the advanced equipment of Hongcheng."

Raw materials: Limestone. Fineness of the finished product: 325 mesh D96. Equipment model and number: 8 sets of HC1700. Annual output of equipment: 920,000 tons (8 sets). Customer Reviews: " As an old friend of many years of cooperation, the quality and service quality of Hongcheng is naturally the best. After a few years of deep cooperation, we find that the biggest feature of Hong Cheng is to serve the customers by heart, to solve practical difficulties with no bragging, no exaggerate, not boast, to do things honestly and to be sincere to people. To work steadfast and steady, and this is just the virtue of this strength, the more than 10 grinding machine provided by Hong Cheng has showing outstanding performance in our company's desulfurization power plant, calcium carbonate ultrafine powder processing project."

how can calcium hydroxide be made from limestone

Limestone is a sedimentary rock abundant on earth, which is mainly composed of calcium carbonate (CaCO₃) and many other minerals. Calcium hydroxide is also called hydrated lime, lime hydrate or slaked lime, whose chemical formula is Ca(OH)₂and it is the product of  reaction between quicklime and water. Then how can limestone turn into calcium hydroxide? In fact, it is partly of the limestone cycle. When calcium carbonate (CaCO₃) is heated, it can produce quicklime(CaO) and carbonate dioxide (CO₂). And the carbonate dioxide is driven off by air flow in lime kiln. Then when the quicklime is added with appropriate amount of water, the process can produce calcium hydroxide and heat. So this is how calcium hydroxide is made from limestone.

To obtained desired sizes of feed limestone, the extracted limestone will go through primary, secondary and even tertiary crushers. Then the reduced sizes of limestone is screened and washed to ensure the high quality of final product

Currently, limestone is calcined in lime kilns. And there are two kinds of lime kilns, one is rotary lime kiln and vertical lime kiln. With development of technology and consciousness of environment, modern lime kilns are built to save energy and perform with high efficiency. In general, the limestone in lime kiln will go through three stages: preheating, calcining and cooling. In the preheating stage, the feed limestone is pre-calcined using the heat air from kiln so that it can thoroughly burnt down. While in the calcining stage, the fuel is introduced into the lime kiln to calcine the preheated limestone. Finally, the quicklime is cooled by contact with cooling air, so that the final product can be handled by conveyors and so on

For the modern rotary lime kiln, it is equipped with separate vertical preheater and vertical cooler. As a result, there is no need for long rotary lime kiln. And it also can improve heating efficiency for it uses the exhaust gases from kiln to preheat the limestone. In turn, this can save energy. As for vertical lime kiln, it contains three chambers to go through the three stages respectively

how can calcium hydroxide be made from limestone

Firstly, quicklime is crushed for processing hydrated lime. Then adding water to the crushed quicklime to make the chemical reaction happen. Of course, the proportion of quicklime and water is carefully calculated. And then the obtained hydrated lime is classified to meet customers’ specific needs.

a chemical of many uses: lime in the pulp and paper

The pulp and paper industry integrates different manufacturing and chemical processes to prepare a variety of products essential to modern society. To complete these processes, the industry requires many different compounds for a variety of tasks

One of these is lime. As noted in T 617 – Analysis of lime, “two forms of lime are used in the pulp and paper industry: quicklime or unslaked lime and hydrated or slaked lime.” We have discussed these in past posts, but to clarify: quicklime (calcium oxide, CaO) is a white crystalline mineral that is derived from the rapid thermal decomposition of limestone and generally obtained in a kiln; slaked lime (calcium hydroxide Ca(OH)2) is a somewhat-similar-in-appearance white powder that derives from the mixing, or “slaking”, of quicklime with water

a chemical of many uses: lime in the pulp and paper

Each of these forms of lime is incorporated into a different pulping procedure. Ultimately, the primary goal of pulping is to dissolve away the lignin that binds together the cellulose fibers of wood. Each process makes use of lime in different ways to fulfill this task

Kraft pulping (also known as the sulfate process) is the most widely used pulp process. During this procedure, wood chips are digested at elevated temperature and pressure in “white liquor”, essentially a water solution containing different chemicals that dissolve the lignin. Since kraft pulping is often done in batch digesters, after going through a process of cooking, washing, pressing, and drying, the cooking chemicals and heat are captured and used again in the same process to dissolve more lignin

Slaked lime is essential to this process, since it is one of the main chemicals present throughout its different steps. The kraft process begins by mixing caustic soda (NaOH) with the initial wood chips under high heat and pressure. After attacking the wood’s lignin, the caustic soda is converted to sodium carbonate (Na2CO3), which is then pumped into a vessel containing slaked lime. With the introduction of slaked lime, the two react to form calcium carbonate and caustic soda, the latter of which is once again mixed with wood chips to continue the process all over again

a chemical of many uses: lime in the pulp and paper

However, the cyclical nature of the process doesn’t end with this stage. The calcium carbonate is heated to form quicklime, which is then slaked so that it can be mixed with sodium carbonate once again

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