digital divide network - article database

Manganese (Mn) is a brittle metal with silvery white color, which is an element arranged in subgroup VIIB of the periodical table of elements. Its atomic number is 25 and the atomic weight 54.938. It has II-, III-, IV- and VII-valence states in nature, of which II- and IV-valence states are more common.

Up to date, over 150 Mn-bearing minerals have been discovered. Among them, the following minerals are of industrial value and commonly seen in nature: pyrolusite (MnO2), psilomelane (mMnO?MnO2?H2O), manganite (MnO2?H2O), hausmannite (Mn3O4), braunite (Mn2O3), rhodochrosite (MnCO3) and alabandite (MnS).

Henan Hongxing Mining Machinery Co., Ltd is a joint-stock mining machinery manufacturing enterprise integrated in scientific research, production and marketing. It is located at the High & New Technology Industries Development Zone of Zhengzhou,China with an area of 50 thousand m2 which includes 15,000 m2 of standard heavy duty industrial workshop. Equipments are more than 160 pieces, including large and medium sized metal processing, riveting and installing equipments. There are more than 660 workers including 80 administrators with secondary and senior occupational titles and engineering technicians. In order to promote the competitive strength, the advanced technologies have been introduced from America, Germany, Japan and Australia, which established the international advanced production line, first-class modern testing base as well as research centers of sand maker, mill and mine-selecting equipment. Scientific management, advanced processing technology and innovative manufacturing theory make the company become the mining machinery manufacturing and exporting base in China.

Hongxing Company lays much emphasis on the quality and clients. We serve clients with the quality guideline of being responsible for every working procedure, every product and every client. What we have done is for the clients and we believe that quality is the best way to develop market. All of the products have passed the authentication of ISO9001. Hongxing Brand is the Chinese Famous Brand. Reliable and stable quality is the key to success; our products are well known at home and abroad. Now we have tens of thousands of users throughout China and more than 30 world markets, such as: South Africa, Middle East, India, Philippine, Western Europe, Southeastern Asia.

Manganese and its compounts are employed in diversified fields of the national economy. The iron and steel industry is the major user, which consumes 90%~95% of the total Mn resources. The rest 5%~10% are used for other purposes, such as chemical, light, building materials, national defense and electronics industries, environment protection and agriculture and livestock husbandry. All in all, manganese is an important strategic metal in the national economy.

The Whitefield Mine in Tennessee, the US, is the earliest manganese mine in the world, which was first mined in 1837. India started its manganese mining as early as 1892 and the export of manganese ore ranked first in the world before World War I. This place, however, was taken by the former Soviet Union after 1928. Other countries such as Brazil, Ghana, Australia, South Africa and Gabon also have a fairly long history of manganese mining.Henan Hongxing Mining Machinery Co., Ltd is the professional manufacturer of complete sets of mining machinery, for example,cement mill,hammer crusher Welcome all of you to visit our official website.china jaw crusher:http://www.crusher-machine.com/1.html

In China, the earliest Mn mine is the Yangxin Mine in Hubei Province. It was first exploited in 1890, but shut down shortly afterwards due to poor ore quality. The Xiangtan Manganese Mine in Hunan Province was mined in 1914 and then the Mugui Mn deposit in Guangxi, Hehua deposit in Jiangxi, Wafangzi deposit in Liaoning and Qixia deposit in Jiangsu were found and mined. According to incomplete statistics, during a period of 33 year from 1912 to 1945, 1.4 million tons of Mn ores were mined in total and the average annual output was 42,000 tons with the highest of 74,300 tons in 1927.

Large-scale geological prospecting and mining were launched after 1949 when the People's Republic of China was founded. Statistics show that totally 109 million tons of ores had been mined from 1949 to the end of 1997 and the highest annual output was 7.66 million tons (1996). The cumulative explored reserves were 664 million tons.