YICHUN CITY KEYUAN CHEMICAL INDUSTRY CO,.LTD
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In 2007, China produced 2.718 million tons of lead, excluding 20% of the recycled lead, and required 2174,000 tons of lead concentrate (metal amount). During the same period, 918,000 tons of lead concentrates were produced, so the self-produced concentrate self-sufficiency rate was only 42.2 percent. 07 annual production of 145400 tons of metal lead and zinc concentrate (including 99900 tons of zinc concentrate, lead concentrate of 45500 tons), and in the same period of last year was flat, and lead and zinc smelting metal capacity is 273800 tons, up 28.53% from a year earlier (including electric lead, 92200 tons, up 22.48%). About more than 75% of China's lead ore resources have been occupied, are available for planning and utilization of lead and zinc mineral resources reserves is insufficient, identified as lead and zinc mineral resources, in terms of its foundation reserves, can only meet for 13 years and 15 years of mining the need, far below the world average, and the Chinese refined lead production mainly native lead, secondary lead the proportion is not big, about 20%. By the end of 2006, the national reserves of lead ore were 41,141 million tons, including 13.51 million tons of basic reserves, 32.6 percent, ranking the second in the world after Australia. However, China has a large population, ranking the fourth place in the world on average from the world of population, and ranks in the top 100. Although lead ingot prices since the second half of 2007 by a few a few falls, but the general trend or prices, once the global economic recovery, like the October 2007 20000 yuan/tons of situation is still present in front of us, so the lead salt stabilizer price advantage in the future a long, long time no longer exists.
If from the current consumption of lead stabilizer 200000 tons, consumes more than 100000 tons, electrolytic lead in if the lead-zinc deposit 2% lead (lead the grade of ore deposits in China is given priority to with less than 3% of the lean ore, more than 3% of the proven reserves of lead accounts for only about 30% of the total proven reserves ), calculated from left to right, need to use lead ore 5 million tons, this is just the consumption of one year, is only used for PVC plastic products processing, too amazing. But the 200000 tons of lead stabilizer of PVC plastic products are up to 12.5 million tons, the annual ten million tons of recycling difficulties leaded the environmental impact of disposed products, when these heavy metals into the soil. Classics, such as water, gas and biological medium transmission (especially the national eating habits of life, a lot of vegetables, grains and so on all learned from the soil heavy metal), through the way such as drinking water, breathing, eating, skin enter human body, has brought human health threat. Furthermore, according to the report, the environmental problems caused by lead cadmium pollution in China are already serious:
1) represented by hui county in gansu province blood lead paint events, lead smelting production enterprises due to backward technology, such as below-standard pollution prevention, emissions from a large number of harmful gas and dust, appear constantly collective blood lead levels around the event.
2) lookout Oriental weekly journal 13 07 registration features "base number is not clear that China soil pollution", revealing the most rural land near major cities in China in the production of grain, vegetables, fruits and other agricultural products, heavy metals such as lead, cadmium, chromium, arsenic content exceeds bid or close to the critical value, especially the nitrate content in leaf vegetables and edible orange roots has severely overweight.
Such reports abound, of course, but directly caused by the production and use of heat stabilizer and the massive pollution events have yet to see reports (production, the use of methyl mercaptan tin poisoning have occurred, but in small range). But we still cannot treat STH lightly, "white pollution" resulted in the closing film bag production enterprises a lot of events should be we attach great importance to, can't let an incident caused the crisis in the industry.
Lead salt stabilizers are currently in the development of dust-free composite lead, which tends to lead to low lead and eventually lead to lead-free. Composite lead salt heat stabilizers is in a stable effect under the condition of constant heating and mixing conditions will have a synergistic effect of all kinds of lead salt stabilizer, auxiliary heat stabilizer and lubricant inside and outside, fully dispersed blend made of granular or flake composite stabilizer. This kind of thermal stabilizer (granule, sheet and prepackaged materials) not only maintains the characteristics of the thermal stability of lead salt, but also reduces the toxicity of lead salt dust. Europe started using compound stabilizer to make powder preparation technology will monomer or flake, and the research and development of a series of clean composite stabilizer products, in the process of this kind of product due to the use of relatively more environmental protection, so the downstream customer widely recognized. At present our country to use more dust-free composite lead salt heat stabilizers, in addition to the German bear brand SMS318 type, henkel company (Henke1) STA - B Ⅱ DX2840 type, a large number of domestic enterprise production varieties, annual sales of up to tens of tons. Although composite lead salt a certain extent, ease the problem of high lead is toxic, but essentially is back with environmental protection laws and regulations, in the use of calcium/zinc stabilizer environmental protection performance, the price is the bottleneck breakthrough today, lead salt production enterprises shall lead-free environmental protection product development as soon as possible, to maintain the competitiveness of the market.
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