Environmental Grade Calcium Hydroxide

Environmentally Friendly Grade Calcium Hydroxide Information Introduction

Environmental grade calcium hydroxide is a high-activity calcium hydroxide powder specifically designed for environmental remediation. Based on industrial grade standards, it features enhanced parameters such as chemical reactivity and particle size control, fully meeting the stringent efficiency requirements for applications like flue gas desulfurization and wastewater treatment in the environmental sector.

Powder Characteristics of Environmentally Friendly Grade Calcium Hydroxide

Chemical Properties: Stable calcium hydroxide (Ca(OH)₂) content between 92%~95%. Typically exhibits a specific surface area >2.5 m²/g, indicating high activity and a reaction rate superior to standard calcium hydroxide.

Physical Properties: Fineness generally ranges from 200~325 mesh, with a concentrated particle size distribution and minimal coarse particles. The powder is dry, loose, and exhibits good flowability.

Whiteness: Typically ≥85, appearing as a uniform white powder.

Moisture Content: Free moisture content ≤1.5%. Requires strict moisture-proof packaging (e.g., film-coated woven bags) to preserve the activity of the final product.

Preparation Process of Environmentally Friendly Grade Calcium Hydroxide

Quicklime Raw Material → Lime Hydrator → Water Mist Dust Collector → Hydrated Calcium Hydroxide

Environmental grade calcium hydroxide is primarily produced using a secondary digestion system lime hydrator (twin-shaft mixer + chain-type stirring digester) to obtain highly active calcium hydroxide. The quicklime raw material first undergoes preliminary digestion in the twin-shaft mixer under precisely controlled water-to-lime ratios (0.65~0.85:1) and optimal temperatures. Subsequently, the chain-type stirring digester gently agitates and conveys the material over a long distance. Maintaining conditions above 90°C ensures thorough, uniform aging and deep digestion, forming porous, flocculent, highly reactive calcium hydroxide.

Hydrated Lime Classifier → Environmental Grade Calcium Hydroxide

The hydrated calcium hydroxide then passes through a Hydrated Lime Classifier for separation. Coarse particles with incomplete reaction are returned to the digestion system for further processing, while the finely reacted powder is collected as the finished product. This process ultimately yields environmental grade calcium hydroxide powder with a specific surface area ≥2.5 m²/g, high activity, fast reaction rate, meeting the requirements of environmental applications such as power plant desulfurization and wastewater treatment.

Application Fields of Environmental Grade Calcium Hydroxide

Exhaust Gas Treatment: As an efficient alkaline absorbent, environmental grade calcium hydroxide is widely used in flue gas purification for industries such as power generation, metallurgy, and waste incineration, effectively removing acidic gases like sulfur dioxide and hydrogen chloride.

Wastewater Treatment: Neutralizes acidic wastewater from industries like electroplating and mining, and efficiently removes pollutants such as heavy metals, fluorides, and phosphates through the formation of hydroxide precipitates.

Soil Remediation: Adjusts pH for acidic soil restoration and heavy metal-contaminated soil stabilization. Also used for solidifying hazardous waste and acidic slag, significantly reducing the environmental mobility risk of pollutants.

Environmental Materials: Serves as a key raw material for producing environmental construction materials like desulfurized gypsum, facilitating the recycling of resources from pollution control.

Technical Parameters of Environmental Grade Calcium Hydroxide

Frequently Asked Questions About Environmental Grade Calcium Hydroxide

How is the activity of environmental grade calcium hydroxide tested?

Activity can be comprehensively verified through multi-dimensional testing including specific surface area analysis, reactivity tests, slurry performance evaluation, and simulated desulfurization experiments. Ultimately, the desulfurization efficiency or neutralization capacity under actual operating conditions serves as the key assessment standard for activity level.

How should environmental grade calcium hydroxide be stored?

Environmental grade calcium hydroxide must be stored in moisture-proof, sealed packaging to strictly isolate it from air and moisture. The storage warehouse should be kept dry and well-ventilated with ambient temperature controlled between 5~30°C. The recommended storage period is no more than 3 months. If used beyond this period, the effective calcium content and activity indicators must be re-tested.

What precautions should be taken when using environmental grade calcium hydroxide?

As a strongly alkaline powder, operators must wear protective gloves, goggles, dust masks, and protective clothing throughout handling to avoid skin contact and inhalation of dust, preventing irritant burns. During storage, it should be isolated from acids and other chemicals, kept in a cool, dry place in sealed packaging to prevent moisture-induced caking and accidental mixing with acidic substances that could cause violent neutralization reactions.