Leather industry from fur, leather shoes, leather goods, leather garments and other main industries and leather chemicals, leather machinery, leather industry and other supporting hardware components. China is the world recognized the big leather and footwear producing countries, pigs and sheep leather processing totaled 170 million, accounting for 20% of world production total. However, our lack of investment in technology research and tanning, energy saving situation is grim, resource recycling rate is poor, environmental pollution has become a bottleneck in the development of China's leather industry.
Leather products industry can generally be divided into two kinds of light leather and heavy leather. Chromium salt because it has excellent trample resistance, imparting high hydrothermal stability of leather, soft and full of feeling, and washable leather finished, excellent corrosion resistance, and become the most widely used in the tanning industry leather boots agent. Light texture chrome tanned leather is generally used, vegetable tanning agents tanning method lighter leather processing, industrial process will produce large amounts of industrial waste chromium, while China's leather industry to light mainly accounted for the entire leather industry 90%.
In the leather industry, each dealing l Ton fur, about to be discharged chromium 400mg/L wastewater 50-6O Ton, kneading industry average utilization of 60-70% chromium, of which 25-30% residual waste, about 10% in water, squeeze water discharge process, a large number of untreated wastewater containing chromium with sewage discharged into rivers, lakes and the sea, causing serious environmental pollution. Tannery wastewater Cr3 + chromium ions mainly exists in the form, content is generally 60-100mg/L. Cr6 + has a great stimulus and corrosive, causing ulcers,laryngitis and enteritis. Epidemiological studies have shown: Cr6 + compounds are common carcinogens inhaled into the bloodstream capture part 02, so that the hemoglobin to methemoglobin,red blood cells carry gas dysfunction occurred in interest rates.