Name | Zinc hypoxide |
Synonyms | Zinc hypoxide zinc(I) oxide |
CAS | 107893-14-1 |
Molecular Formula | H2O2Zn |
Molar Mass | 99.4038 |
Physical and Chemical Properties | A fine white or yellowish powder that is easily dispersed in rubber and latex. |
Downstream Products | Zinc nitrate lithopone |
zinc smelting industrial waste residue | secondary zinc oxide is one of the main waste residues in zinc smelting industrial waste residue, named after its main component is secondary zinc oxide. The chemical composition of secondary zinc oxide varies greatly with the source of ore. It generally contains zinc, arsenic, antimony, tin, silver, lead, tin and other metals. Among them, lead, arsenic and other elements are toxic and easy to cause serious water and soil. Pollution; secondly, these heavy metals have high recovery value, especially in the current situation of relatively scarce resources, focusing on the extraction of rare and scattered metals, carrying out research on the comprehensive recycling of zinc oxide from zinc smelting industry waste residue is not only a full use of secondary resources, but also conducive to environmental protection, and has significant economic value and social benefits. Figure 1 is a picture of gray zinc oxide powder |
current situation of domestic and foreign industries | most of the lead-zinc mineral raw materials are co-existing with lead-zinc ore, and it is difficult to achieve complete separation of lead and zinc through preferential flotation. Lead-zinc ore smelting is to enrich zinc in slag, and then treat the slag with a fuming furnace to produce zinc oxide or secondary zinc oxide. In addition, the leaching residue and poor zinc oxide ore produced by the wet zinc smelting plant are fumed in a rotary kiln to obtain zinc oxide or secondary zinc oxide. The main component of secondary zinc oxide is ZnO, but the grade is generally 45% ~ 65%. The so-called "second" refers to the second grade. In Guangxi, Guizhou, Yunnan, Hunan and other places in my country, the output is relatively large, and its main purpose is to further process electrolytic zinc or zinc oxide. |
secondary zinc oxide recovery | secondary zinc oxide is rich in valuable metals, but due to its complex composition, difficult recovery and high separation cost, most of them are not fully utilized, and the comprehensive recovery status is not ideal. low-grade secondary zinc oxide is usually used as waste, causing a large amount of solid waste accumulation and serious pollution to the surrounding environment. |
toxicity | arsenic in secondary zinc oxide minerals is a highly toxic substance, and the arsenic content of secondary zinc oxide is high (up to 8% to 10%), which is one of the main reasons hindering its comprehensive recovery. "when sulfuric acid is leaching with high acid, about 90% of arsenic is leached into the solution, which seriously interferes with the separation of rare and scattered metals. The rest of arsenic remains in the slag, accumulation will dissolve into groundwater, causing environmental pollution. Recently, there have been times of zinc oxide used to produce low-grade zinc salts! Or as an inorganic filler, but the production process is simple, and there are big problems. "For example, the arsenic pollution produced in the process of producing zinc salt is serious, and these problems still need to be studied and explored." There are also literature on the recovery of individual elements in secondary zinc oxide, but the comprehensiveness is poor, and there is a lack of more systematic research. "Systematic research on each link of comprehensive recovery, finding out the separation method of complex solid mixture is the key task of comprehensive recovery of secondary zinc oxide. |
white pigment | due to the good activation performance of active zinc oxide, it has been more and more widely used in rubber products. for example, in v-belt, it can not only replace ordinary zinc oxide in the same amount, but also reduce the dosage of 1/2-1/3, so that various performance indexes of rubber are stable, vulcanization performance is not affected, and production cost is reduced. Fine zinc oxide can be used as a pharmaceutical. Due to the strong ability of zinc oxide to absorb ultraviolet rays, people pay more and more attention to the application of zinc oxide in cosmetics. For example, the developed zinc oxide particles with a particle size of 0.01-0.04um have better ultraviolet absorption and transparency than the traditional titanium dioxide particles. |
application of zinc oxide | after active zinc oxide is added to the rubber compound, the rubber can have good wear resistance, tear resistance and elasticity. Used for the coloring of paints, inks, and lacquer cloths, printing and dyeing industry anti-dyeing agents, used in the match industry to neutralize the acidity of kraft rubber and increase the adhesive effect. The pharmaceutical industry is used as a raw material for plaster, and it is also used for pigments The manufacture of zinc chrome yellow, zinc acetate, zinc carbonate, zinc chloride, etc., a catalyst for the synthesis of methanol, a desulfurizer for synthetic ammonia, glass and glaze production, fine active zinc oxide (particle size about 0.23um) can be used as a light stabilizer for polyolefins and polyvinyl chloride and other plastics. Zinc oxide is also used in pressure sensitive, photocatalysis, photoelectrodes, coatings, color TV development and other fields. the coating film made of transparent zinc oxide for zinc oxide can effectively prevent the discoloration of the coating film. In addition to cosmetics, this kind of zinc oxide can also be used as a raw material for car paint, furniture building materials, ink, oil paint, and can also be used as an anti-aging agent for rubber and plastics. The recently developed transparent film for food packaging is to coat transparent zinc oxide on polyethylene film, which can not only improve the UV resistance of plastic film, but also protect the quality of food. With the development of high and new technology, people are developing and utilizing zinc oxide whisker materials and ceramics as reinforcing materials for metals and ceramics. Materials for plastic filter membranes, gas sensing elements, electromagnetic shielding materials and zinc oxide materials with large specific surface areas. |
process flow for producing zinc sulfate heptahydrate from secondary zinc oxide | wet production of zinc sulfate heptahydrate: as an important industrial raw material, zinc sulfate heptahydrate is widely used in agriculture, chemical manufacturing, electroplating, man-made fiber, water treatment, lithopone and zinc salt, anti-corrosion of materials and leather, bone glue, insect prevention of fruit trees and zinc fertilizer. China's annual output is about 60,000 tons, and more than 30% exports use sub-zinc oxide as raw material to prepare zinc salt series products, with strong adaptability and high zinc recovery rate, reaching more than 93% tons. the process flow of sub-zinc oxide producing zinc sulfate heptahydrate is as follows: fig. 2 is the process flow chart of sub-zinc oxide producing zinc sulfate heptahydrate |