The report provides a detailed analysis essential for establishing a Calcium Hydrosulfide production plant. It encompasses all critical aspects necessary for Calcium Hydrosulfide production, including the cost of Calcium Hydrosulfide production, Calcium Hydrosulfide plant cost, Calcium Hydrosulfide production costs, and the overall Calcium Hydrosulfide production plant cost. Additionally, the study covers specific expenditures associated with setting up and operating a Calcium Hydrosulfide production plant. These encompass production processes, raw material requirements, utility requirements, infrastructure needs, machinery and technology requirements, manpower requirements, packaging requirements, transportation requirements, and more.
Calcium hydrosulfide, Ca(SH)2, is a chemical compound utilised in multiple industrial sectors due to its strong reducing properties, sulfur content, and ability to form insoluble sulfides. In the pulp and paper industry, it functions as an important sulfur source for kraft pulping processes, where it aids in lignin degradation from wood chips. Its precipitation efficiency is used in wastewater treatment to remove over 99% of heavy metals like cadmium, mercury, lead, copper, and arsenic from industrial effluents in mining, chemical, and smelting operations by forming stable metal sulfides.
It functions as a flotation agent in metallurgy and mining for sulfide ores such as copper and nickel, enhancing extraction yields. It also acts as a reducing agent in smelting byproducts and ore processing. It is used in leather processing for depilatory processes to dehair hides during tanning, improving efficiency in skin preparation. Additionally, it finds application in chemical synthesis as a reducing agent, agriculture as a sulfur fertiliser for soil amendment and pest control, and emerging research in nanotechnology for metal sulfide nanoparticle precursors used in optoelectronics.
The market demand for calcium hydrosulfide is driven by surging demand in major end-use industries like pulp and paper, water treatment, and food preservation. Its cost-effectiveness compared to alternatives drives adoption along with affordable pricing, abundant raw materials, and expanding applications in urbanisation-driven regions such as the Asia Pacific.
Additional drivers include rising needs for heavy metal precipitation in mining effluents, growth in ready-to-eat foods boosting food-grade demand (48.5% market share), and steady pulp production increases in developing economies. Industrial calcium hydrosulfide procurement is influenced by raw material price volatility and supply chain disruptions, mainly due to fluctuations in calcium and sulfur source availability, which directly impact production costs and pricing stability.
Raw Material for Calcium Hydrosulfide Production
According to the Calcium Hydrosulfide production plant project report, the various raw materials for Calcium Hydrosulfide production include calcium hydroxide and hydrogen sulfide gas.
Production Process of Calcium Hydrosulfide
The extensive Calcium Hydrosulfide production cost report consists of the following major industrial production process:
- Production via a cyclic process: The production process of calcium hydrosulfide begins with reacting an aqueous suspension of calcium hydroxide (milk of lime) with hydrogen sulfide gas. The reaction occurs mainly in a cyclic process that handles impure H2S sources containing carbon dioxide to produce concentrated solutions of calcium hydrosulfide (25-31 wt% Ca(HS)2) that remain fluid at room temperature.
Properties of Calcium Hydrosulfide
Calcium hydrosulfide, Ca(SH)2, is a white to pale yellow hygroscopic crystalline solid with a molecular weight of 106.22 g/mol, density of 1.85-1.95 g/cm³, and solubility of about 25 g/100 mL in water at 20 degree Celsius. It forms strongly alkaline solutions (pH 11-12) while decomposing around 120 degree Celsius to release hydrogen sulfide. It functions as a potent reducing agent and nucleophile that oxidises rapidly in air, precipitates heavy metals as insoluble sulfides with over 99% efficiency, reacts with acids to evolve H2S gas, and remains stable under alkaline reducing conditions. It has characteristic IR absorption at 2570-2590 cm-¹ for S-H stretching. It finds primary applications in kraft pulping for lignin degradation (global use >50,000 tons/year), wastewater treatment for metal removal in mining and chemical effluents, ore flotation in metallurgy, leather dehairing, and as a sulfur fertiliser or nanoparticle precursor.
