The paper and pulp industry depends heavily on lime for various chemical processes such as pulp digestion, kraft cooking, causticizing, pH control, wastewater treatment, and brightness improvement.
The most commonly used limes in paper mills are:
High-Calcium Quick Lime
High-Purity Hydrated Lime
Lime Mud (Recycled Calcium Carbonate)
These forms help in alkaline processing, fiber breakdown, bleaching, and making the paper bright, smooth, and durable.
Keywords included:
paper industry lime, lime in pulp and paper, quick lime for paper, hydrated lime for paper mills, kraft process lime, causticizing, lime kiln, white liquor.
Paper mills mainly use two types of lime:
Used in:
Kraft pulping
Causticizing process
Recausticizing with sodium carbonate
Chemical recovery
Lime kilns
Used in:
pH control of pulp
Wastewater treatment
Bleaching support
Fiber washing & cleaning
Both limes must be highly reactive, low-impurity, industrial-grade for smooth chemical reactions.
Supports kraft pulping
Converts sodium carbonate → sodium hydroxide (caustic soda)
Controls pH during pulp washing
Removes impurities & suspended solids
Acts as a whitening agent
Helps in wastewater neutralization
Strengthens fiber bonding
Reduces production costs
| Lime Type | Scientific Name | Used In Paper? | Primary Functions |
|---|---|---|---|
| Quick Lime (Correct) | Calcium Oxide (CaO) | ✔ Yes | Causticizing, kraft process, chemical recovery |
| Hydrated Lime (Correct) | Calcium Hydroxide (Ca(OH)₂) | ✔ Yes | pH control, bleaching, wastewater treatment |
| Lime Mud | Recycled CaCO₃ | ✔ Yes | Internal chemical recovery |
Fibers turn into pulp → later converted into paper
Hydrated Lime – Properties, Manufacturing Process & All Major Applications
Calcium Carbonate Food Grade – FCC Certified Manufacturer & Supplier in India
Hydrated Lime Food Grade – FCC Certified Calcium Hydroxide by Vigyan Lime
Calcium Carbonate (Food Grade): Uses, Benefits, Specifications & Trusted Manufacturer in India
High-Calcium Quick Lime (CaO).
Yes — mainly for pH control and wastewater treatment.
It creates caustic soda, essential for separating cellulose fibers from wood chips.
High-reactivity, low-silica, low-magnesium lime is preferred.
Recycled calcium carbonate used in chemical recovery systems.
No — magnesium content slows reaction and reduces paper quality.
This will close in 30 seconds