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At present, the domestic wet zinc smelting mainly adopts the roasting-leaching-electrowinning production process, and the zinc content in the acid leaching residue is generally 8-15%, some up to 20%, and the sulfur mass fraction is 6-12%, of which sulfuric acid The root mass fraction is 15-30%, mainly in the form of 0^0 4 (in this ammoniatic environment, the leaching rate of sulfate leaching in multiple stages can reach 70%). The zinc in the acid leaching residue is mainly in the form of ZnFe 2 0 4 . In order to recover these zinc, the treatment methods are currently available in the fire method and the wet method. The fire method is the rotary kiln evaporation method (Wilz method) and the fumigating furnace evaporation method. . The wet method has hot acid leaching or high temperature pressure leaching. The fire treatment process is long, the equipment maintenance is large, the investment is high, the working environment is poor, and a large amount of coal or metallurgical coking coal is consumed, which has low efficiency and large environmental pollution. Therefore, it is usually leached by hot acid or high-pressure leaching. These methods still have the disadvantages of: 1 consumption of a large amount of acid, low leaching rate, due to the large amount of calcium sulfate, calcium sulphate and other ultrafine particles to isolate the zinc oxide particles, resulting in Electrolytic zinc enterprises are difficult to leach in acid environment, and the second weak acid leaching is not meaningful because the recovery rate is too low. 2 If leached with strong acid, although ZnFe 2 0 4 is destroyed, the leaching rate is improved, but the iron leaching rate is also high (up to 60%). The pressure of iron removal is large, and more reagents are consumed. 3 High temperature and high pressure equipment is corroded. Serious, complicated equipment investment; 4 high operating costs, poor economic returns. 5 The last slag discharged is acid leaching residue, which brings new pollution to the environment. It has to be cured and landfilled, which not only pollutes the environment, but also wastes resources.

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The global Lithopone market is highly consolidated and a major bulk of Lithopone is produced in China. Some of the major Lithopone producers include Anhui Union Titanium Enterprise Co. Ltd., Fengchen Group Co. Ltd., Henan Premtec Enterprise Corporation, Langfang Pairs Horses Chemical Co. Ltd., Natural Pigments Inc., Noah Technologies Corporation, Titanos Group, VB Technochemicals SA, Venator Materials PLC, and ZhengZhou Sino Chemical Products Co. Ltd.

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Historically, the first mentions of zinc sulfide being utilized as a pigment were approximately sixty years before the everyday use of lithopone. Originally, it was thought to be appropriate for coloring rubber. In England, a patent was granted for this process. Two decades after this, the focus shifted to zinc sulfide as a suitable pigment for paint. The year 1874 witnessed the patenting of a manufacturing process for a novel white pigment composed of zinc sulfide and barium sulfate. Dubbed Charlton white or Orr’s white enamel, this began a new era for white pigments.

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  • One of the standout advantages of steel portal frame warehouses is the speed of construction. The components are typically prefabricated off-site and then assembled on location. This process can significantly reduce construction time compared to conventional building methods. Faster construction not only minimizes labor costs but also enables businesses to occupy their facilities sooner, allowing them to begin operations without lengthy delays.


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    3) Place goods reasonably and reserve fire escapes. Conduct regular fire safety training for employees, use of fire extinguishers, and exit methods.

  • Durability: Your building should provide unbeatable protection to the materials that you warehouse. It should come as no surprise that the number one source of warehouse fires is lumber. Steel framing is not only non-combustible, but also resistant to a variety of environmental elements from pests to earthquakes. The building materials will never settle, maintaining a tight seal for temperature-controlled environments.

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  • In recent years, the construction industry has seen an increasing shift towards prefabricated metal buildings, offering enhanced durability, cost-effectiveness, and speed of construction. Among the various dimensions available, the 30% 20 x 40 prefab metal building has garnered significant attention for its versatility and practical applications.


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  • While functionality is vital, the visual appeal of a shed should not be overlooked. Modern metal sheds are available in various colors and finishes, allowing homeowners to choose a design that complements their garden and home. Some even come with added features like windows, skylights, and vents for better ventilation and natural lighting. This flexibility enables you to customize your 10x10 shed to fit seamlessly into your outdoor space, enhancing both aesthetics and functionality.


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