Quality report on China’s kaolin ores
The quality of China’s kaolin is generally better than intermediate. According to the statistics of 213 kaolin occurrences (whose retained reserves account for 73% of the country’s total), 72 occurrences (including large or superlarge deposits such as the Yanshan deposit at Suzhou City, Jiangsu, the Donggongxia deposit at Longyan City, Fujian, the Shange and Shangdong deposits at Maoming, Guangdong, the Yashan deposit at Yichun, Jiangxi, the Hepu deposit in Guangxi and the Hancheng deposit in Shaanxi) have an average ore grade (Al2O3 content) of 39.44%~30% and their retained reserves constitute 59% of the total reserves of the 213 occurrences that take part in the statistics; 134 have an average ore grade of 30%~14% and their retained reserves account for 34% of the total reserves of the 213 occurrences; 7 have an average ore grade 14% and their retained reserves make up 7% of the total reserves of the 213 occurrences. The average content of the harmful component Fe2O3+TiO2 is commonly 2% (which is 1% in deposits at Maoming and Zhanjiang in Guangdong, Longyan in Fujian and Songyang in Zhejiang). In the past, China had long been short of kaolin used for paper coating material and fillers, and high-duty kaolin mainly relied on the supply of the Yangshan mine at Suzhou City, Jiangsu. Since high-duty kaolin deposits with large reserves were discovered at Dongxiagong, Longyan City, and Guoshan, Tong’an County, Fujian Province in 1987, and a superlarge kaolin deposit at Maoming City, Guangdong, was explored in 1989, China has ranked among the counties with abundant high-duty kaolin resources. At present, of the retained kaolin reserves of China, papermaking-grade kaolin contributes 41%, ceramic-grade kaolin contributes 48%, and others such as white cement-, rubber- and electric porcelain-grade kaolins amount to 11%.As the professional manufacturer of complete sets of mining machinery, such as ore beneficiation,rotary dryer, Henan Hongxing is always doing the best in products and service.limestone rotary kiln:http://www.hxjq-crusher.com/23.html.ore separating line:http://www.hxjqchina.com/.
Kaolin deposits of China also contain mica, alunite, pyrite, siderite, pyrophyllite, bentonite, K-feldspar, quartz, bauxite, coal, noble metals and rare metals. During ore dressing these associated minerals (e.g. mica and alunite) should be recovered as by-products as fully as possible, and total use should be made of tailings such as quartz sand, feldspar-quartz sand, potash feldspar sand and accessory minerals (columbite, zircon, apatite etc.) therein. Thus the economic returns of the mines can be increased.
Kaolin orebodies in China are generally buried at shallow depth and suited for open mining. In some mines ores are very loose and soft and can be hydraulically mined using high-pressure hydraulic giants after the ores are scraped loose by bulldozers or scrapers; in a few individual mines, e.g. the Yangxi mine, Suzhou, Jiangsu, underground mining should be adopted because orebodies are buried relatively deep in the subsurface.
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