Something about the Synthesis Method of Lanthanum Acetate for Preparing Lanthanum Tungsten Electrode - I

This article tells the procedures about one of the synthesis methods of lanthanum acetate preparation, lanthanum acetate, which is the raw material of lanthanum tungsten electrode; its preparing experimental procedure can be seen as follows:

1. Weighing 5g lanthanum oxide, then adding it to a round bottom flask, whose capacity is 500mL and is filled with 200mL acetic anhydride, and then suspension liquid, can be obtained.

2. Heating the flask, what can be seen from the bottom of the container is the deposited product, and then makes it reflux until the reaction is over; the time needed is approximately from 6 to 10h.

3. Removing and placing the product in a vacuum dryer, which containing solid NaOH and anhydrous calcium chloride, and then drying it for two days; after that, putting the product in a vacuum dry gun, drying it , the temperature is controlled at 100 ℃ around.

Lanthanum tungsten electrode (blue color sign)

 

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The Basic Construction of Tungsten Industry in Ganzhou(1949 -1981)-Exploration

Exploration 

The state also put emphasis on tungsten resource exploration. No.908 and 909 geologic exploration teams were established in 1952. There were 6 large tungsten deposits (Xihuashan, Dajishan, Pangushan, Tieshanlong, Piaotang, Huamei’ao), 17 middle deposits and 20 small deposits and other 200 smaller tungsten containing mines in Ganzhou.




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The Discovery and Early Development of Tungsten and Tungsten Ore(1907-1949)-II

In later 1930s, the KMT government carried out the system of state -monopoly purchase and marketing of tungsten mines and set up a tungsten administrative office of resource committee in Ganzhou. A magnetic separator was imported from Germany to dress high-tin tungsten. To some degree, Tungsten mines in Ganzhou played an active role in enhancing the economic strength.

In 1940s, tungsten factories in Ganzhou started its mechanizing production.  Some simple technologies were adopted in production.

As to the geology exploration, the geology institute successively compiled "Gannan Tungsten Mine Records", “The past and present of Jiangxi Tungsten Industry", "Deep Research of Gannan Tungsten Mine" and so on.

In this period, the output was 250,000 tons of concentrate, which were mainly produced by handwork.






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The Basic Construction of Tungsten Industry in Ganzhou(1949 -1981)-Mining Area

After the year of 1949, Chinese government put great importance on tungsten mine production in Ganzhou. The non-ferrous metal general administration of heavy industry ministry was set up in 1950, with Jiangxi sub-bureau and southern Jiangxi area administrative office in Ganzhou. Daji Mountain, Guimei Mountain, Pangu Mountain and many other mines became state-operated. In October, 1950, the first automated dressing plant (125T per day) was started to be built in Daji Mountain. In 1953, Daji, Xihua, Guimei mines and Shangyou hydraulic power station were listed in the 156 national projects in the first 5-year plan. In 1954, the government approved the expansion of Daji and Xihua and the design of Guimei, with respective processing ability of 1600T/day, 1785T/day, 1560T/day. In Daji mine, main production line was automated. In the same year in Dayu county, Hong Shui, Dang Ping ...mines were built. Since 1955, all mines started to use wet drill and fan ventilation to improve automation level and protect miners’ health. In May 23, 1975, the national news paper “People’s Daily” and Central Radio reported no silicosis had been found for 20 years.

By the end of 50s, the local government started to operate tungsten mines. Tungsten industry in Ganzhou was combined by local and state-operated mines.

There appeared many advanced collectives and individuals in this period. During the 30 years, 570,000 tons of tungsten concentrate were supplied.


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The Discovery and Early Development of Tungsten and Tungsten Ore(1907-1949)-I

In 1932, China Tungsten Ore Company was founded in Yudu. Central bank president Mao Zemin was appointed as the general manager. The company supplied 7,890 tons of tungsten concentrate, which was the main source of the financial income of RMB 6.2 million. It contributed greatly to the social development at that time.

The German missionary Mr. Wilhelm discovered tungsten in 1907 in Mount Xihua ofGanzhou where is the first place that tungsten was discovered in China. It was from then on that China’s history of extracting tungsten began. From 1907 to 1914, the annual output of tungsten ore was less than 20 tons, only accounting for about 0.24% of the world’s output. In 1917, tungsten ore was discovered in Dayu, Chongyi, Quannan, Dingnan and Shangyou County. The local people started mining tungsten ore. By 1918, the output of Ganzhou’s tungsten ore was more than 10,000 tons, taking up 60% of the whole world’s output. Afterwards, tungsten ore was discovered in Yudu and Ganxian. The government then paid great attention to the abundant tungsten resources in Ganzhou. In 1929, the first official geology report on tungsten, Gannan Geology and Mineral Survey Report was composed in Ganzhou.




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