Cadmium is not as well known as mercury or lead . Cadmium is an element harmful to the human body. It is mostly in a chemical state in the natural state. The content is very low. The cadmium content in the atmosphere is generally not more than 0.003 μg/m3, and the water is not more than 10 μg/L, not more than 0.5 per kg of soil. Mg. Such low concentrations will not affect human health. Cadmium is often associated with zinc , lead and the like. According to environmental experts, cadmium is widely present in the environment from heaven to earth. After the environment is contaminated with cadmium, cadmium can be enriched in the living body, enriched in other organisms through the food chain, and then enters the human body through food, water, smoking or other means. When the concentration of cadmium reaches a certain level, it will occur. Cadmium poisoning. At the same time, cadmium is a kind of benefit humanity heavy metal, widely used in electroplating industry, chemical industry, electronics industry and the nuclear industry and other fields.
Since the discovery of cadmium in the early 20th century, the production of cadmium has increased year by year. Cadmium is widely used in the electroplating industry, chemical industry, electronics industry and nuclear industry. Cadmium is a by-product of the zinc smelting industry and is mainly used in batteries, dyes or plastic stabilizers, which are more easily adsorbed by crops than other heavy metals. A considerable amount of cadmium is discharged into the environment through waste gas, waste water, and waste residue, causing pollution. The main sources of pollution are lead-zinc ore, as well as non-ferrous metal smelting, electroplating and cadmium compounds as raw materials or catalysts.
The pollution of cadmium to the soil mainly includes gas and water. Gas-type pollution is mainly caused by the diffusion and natural sedimentation of cadmium-containing industrial waste gas, which is accumulated in the soil around the plant, and the cadmium concentration in the soil can reach 40 ppm. The pollution range can reach several kilometers. Water pollution is mainly caused by the ore dressing wastewater of lead-zinc ore and related industries (electroplating, alkaline batteries, etc.) discharged into surface water or infiltrated into groundwater.
The pollution of cadmium in water mainly comes from surface runoff and industrial wastewater. Sulfuric Acid pyrite and waste discharge when taken phosphate manufactured by the phosphate rock containing high cadmium per liter of waste water containing up to tens to several hundreds of micrograms of cadmium, lead and zinc in the atmosphere and non-ferrous metallurgy, combustion Cadmium particles formed by incineration of plastic products may enter the water; cadmium emitted from catalysts, pigments, plastic stabilizers, synthetic rubber vulcanizing agents, fungicides, etc., which are used as raw materials, may also cause pollution to water bodies. The cadmium content in drinking water is often increased due to contamination of containers and pipes.
In the entire die casting industry, the use of aluminum alloy die castings accounts for the highest proportion. Aluminum die casting parts are mainly used in industries such as home appliances, motors, communications, automobiles, and electronics. Some are also used in parts of aviation, navigation and some equipment. Using die-casting processing, the dimensional accuracy of die casting part is relatively high, the surface finish is relatively good, the strength and hardness are high, and the productivity and material utilization rate are relatively high. There are also some problems in the die-casting process, such as cracks, which requires us to anneal the die-casting mold regularly to eliminate the stress in the cavity, or sometimes there are cracks on the surface of the cavity, the surface is polished to remove cracks. And the mold is preheated evenly.
SCZY conducts one-stop services such as mold manufacturing, die-casting production and subsequent CNC machining in-house to ensure production delivery and product quality. We have a relatively systematic understanding of the die-casting process, can predict the problems that may arise in the die-casting process, and can solve the possible problems in advance.
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