Chongqing Hongcan Renewable Resources Recycling Co., Ltd. Chongqing is the largest city in China, with a population of more than 30 million and an area similar to that of South Carolina in the United States. Chongqing is one of the important industrial cities in China. Chongqing hongcan renewable resources recycling co., ltd was established on 20 1 1, mainly engaged in the recycling of waste materials.