2020年5月1日星期五

Talking About Past and Present -- Flotation

Flotation, also known as flotation separation, is a method of separating useful minerals from ores according to the physical and chemical properties of mineral particles.

In the 18th century, it was known that the gas adhered solid particles rose to the surface of the water; In the 19th century, people used gasification (boiled pulp) or acid and carbonate minerals generated by the reaction of flotation graphite flotation. In the late nineteenth Century, due to the increasing demand for metals, the resources of coarse lead, zinc and copper sulfide ores were reduced gradually, in Australia, the United States and some European countries, flotation has been used to fine grained ores to provide concentrates for smelting.

At the beginning of the industrial age, the most widely used flotation method is the total oil flotation, it is based on the oily and hydrophilic nature of the mineral and is stirred by adding a large amount of oil to the pulp, the lipophilic mineral sticking to the oil layer is scraped out and separated from the hydrophilic gangue minerals. This method began in 1898 for the treatment of lead and zinc sulfide industrial production, but because of small production capacity, poor sorting, fuel consumption costs, and soon be eliminated.

flotation image

In 1902, the Americans proposed a method of pellet flotation, in a small amount of oil and soap agents under the conditions of the slurry in the sulfide ore selective flocculation into pellets, thus, the dispersed gangue can be washed away and separated from the aggregate minerals. This method once replaced the whole oil flotation, but it seems that the time is not long.

The froth flotation process, which we have been using since 1924, is derived from the popularity of flotation reagents. It is the selective separation of solid gas from the suspension of water (pulp) into the solid mineral, and is the selective separation process of the gas liquid solid three-phase interface, foam flotation has been called "miraculous invention" in the history of mineral smelting science and technology, and opened a new era of modern flotation methods.

Now, with the progress of industry, our tungsten ore flotation technology is changing with each passing day, but it is still the category of foam flotation. With the flawless beneficiation of chemicals used, flotation of new methods and new concepts are also constantly invented and created, in the accumulation of a large number of technology, China's tungsten flotation field developing, accumulate steadily, industry technology has been in the international leading position. Even some of the western countries, which have been proud of themselves, have turned their back on copy the flotation method of our country.

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Hunan New ShaoTan Tungsten Ore

In November 13, 2014, Xinshao County, Hunan Province, compiled by the 407 team of Hunan Provincial Geological Prospecting Bureau, successfully filed on the Provincial Bureau of land and resources. 

The report shows that the size of the tungsten ore mine in Xinshao County, Hunan Province is a large-scale tungsten mine, proven tungsten resources reserves of 70,400 tons, associated gold, silver, antimony and other metal elements, is expected to mine service life of about 17 years, the total total economic value of about 8 billion yuan. News once broadcast, it led to a warm reaction to the capital market, the listed company's market value increased significantly, because it is the first record of nonferrous metal mineral exploration in Hunan province since 2000, and the reserves are huge. In China, the shortage of tungsten resources is becoming more and more urgent, and the good news is encouraging.

Hunan new ShaoTan tungsten ore image

Tan Xian tungsten ore is located in the Cao Jia village, Xin Shao county, an area of 10.29 square kilometers, located in the Longshan mountain metallogenic belt, tectonic, magmatic activity is strong, excellent mineralization conditions. Of course, behind the dazzling achievement is full of geological prospecting people's hardships. According to 407 team members described in 2010 when the exploration work began, they found Tan Xi tungsten ore area geological situation is complex, fault fracture zone development, the surface is not obvious, the depth of the exploration line is very wide, the thickness is generally larger than 100m, the distribution range is wide, the area is large and the depth is large. Early drilling is used to expose the construction period, the cost is high and the effect is poor. Later 407 brigade summed up the failure experience and sort out the mineralization of the Tan Xi mine, decided to use geophysical methods to detect. The result is remarkable. It is not only fast, effective, but also saves a lot of costs.

For four years, the project team completed the field work from detailed investigation to exploration, completed a total of 2.15 square kilometers of 1: 2000 geological survey, 34 for construction drilling, 13358.05 meters for drilling footage, 4 for aquatic test and 4 for mineral processing. It is determined that the type of deposit is stratabound skarn type tungsten deposit, and 12 mineralization layers are numbered, and the amount of ore body is estimated, a total of 57 laying ore body, ore body thickness of 0.64 meters to 17.56 meters, the average grade of 0.367%, submitted to the amount of 19.16 million tons of tungsten ore, tungsten resources 70,400 tons.

Relative to the gold, Tan Xi tungsten ore seems to have more comprehensive mining value, in 2013, Hunan Province, 304 Geological Survey team in the mine Li Ping village found a new generation of tungsten antimony ore belt. In the future, the development potential of Tan Xi tungsten mine is abysmal.

If you have any inquiry of tungsten, please feel free to contact us:
Tel.: +86 592 5129696/+86 592 5129595
Fax: +86 592 5129797

Scan QR code of Chinatungsten Wechat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.

Apple May Secretly Develop Power Batteries in China

According to the first financial news, apple is working with a Chinese power battery manufacturer secretly developed automotive power batteries, confirmed that the U.S. auto project is not just software, as well as hardware. Apple may really be making a car.

One is the Silicon Valley global high-tech giant, and the other is a power battery manufacturer in Fujian, China. Apple and the Ningde era of new energy Polytron Technologies Inc (hereinafter referred to as the "Ningde era", also known as "CATL") is a project based on confidentiality agreements. According to sources close to the collaboration, the first financial services are being co operated in the field of batteries.

Amperex Technology Limited (hereinafter referred to as "ATL") is Apple's consumer electronics products, the world's largest battery supplier. The Ningde era was part of the parent company's ATL power battery division, which became independent power battery manufacturers in 2011. Ningde times founder Ceng Yuqun, President Huang Shilin and many other start-up shareholders have been ATL executives.

clean energy vehicles image

Apple did not announce any news of the cooperation with the Ningde era, while the Ningde era refused to respond to this. CCID Consulting, new energy director Wu Hui told the first financial reporter said, if Apple and Ningde era cooperate in power battery, it does not rule out the possibility of Apple to continue to build cars, one of the core components of automatic driving electric vehicles is the power battery.

At present, Panasonic battery has become the market leader in automotive power batteries, in 2017, Dalian Matsushita automotive power battery project officially put into operation in April 27th, with an annual capacity of 200 thousand power lithium-ion batteries. If Apple is also making a car, then the potential power battery suppliers are also likely to be in China, and even as Apple's mobile phone, most of the production lines are likely to be in China.

The main reason is that China's manufacturing industry under the guidance of the national "Made in China 2025" strategy. China not only has a good scientific research and investment environment, but also cultivate a large number of outstanding skilled workers. And in the production of materials, China's rich mineral resources, iron, copper, tungsten, molybdenum, aluminum and other important materials. And after years of development, steel, tungsten, molybdenum, copper and alloy smelting industry has been in the world advanced level.

In addition, some experts believe that clean energy vehicles will replace the existing fuel vehicles in the next ten years, but due to the problem of thermal power pollution, electricity is still not ideal for clean energy, perhaps solar energy is the cleanest energy source. In recent years, with the development of nano technology and thin film technology, people have found a variety of can be used for solar cell manufacturing materials, such as monocrystalline silicon, monocrystalline tungsten, monocrystalline molybdenum, zirconium tungstate film, tungsten selenide film, these are very valuable solar power materials.

If you have any inquiry of tungsten, please feel free to contact us:
Tel.: +86 592 5129696/+86 592 5129595
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Development Status of Nano Tungsten Carbide Powder in China

Nanocrystalline cemented carbide is a tool material developed in recent years. It is based on nano tungsten carbide powder.

The cemented carbide with high hardness, high wear resistance and high toughness has been produced under the condition of adding proper binder and grain growth inhibitor, its performance is obviously higher than that of conventional cemented carbide. It has been widely used in hard metal materials, cutting tools, micro drills in the electronics industry, precision molds, medical fields and other fields.

In the aspect of ultrafine or nanocrystalline cemented carbide, there are only a few countries in the world such as the United States, Japan, Sweden and so on, which can produce alloy with both high hardness (HRA>90) and high strength (>3 200 MPa). The main difficulties come from ultrafine and nano tungsten carbide powder and other raw materials and cemented carbide production process.

nano tungsten carbide image

From 70 to 80s in China began to study the industrial production of submicron and ultrafine WC cemented carbide, the granulated tungsten oxide reduction method and the self reduction tungstate process have been developed; Since the beginning of 90s, ultrafine tungsten carbide powder has been produced by hydrogen plasma reduction, micro - violet tungsten reduction, fluidized bed gas phase reduction carbonization, high frequency plasma method, WC-15Co tungsten cobalt carbide alloy with hardness HRA>90 and strength >3 200 MPa was prepared. But compared with the advanced level in the world, there are still some gaps in product quality, production capacity, cost, production process and continuity.

Tungsten cobalt alloy is also called WC Co cemented carbide. According to cobalt content, can be divided into high cobalt (20%~30%), cobalt (10%~15%) and low cobalt (3%~8%) three categories. The key of tungsten cobalt alloy is the purity of tungsten carbide powder. Although some achievements have been made in the research and production of nano tungsten carbide powder, there is still a big gap compared with the advanced level in the world.

It is proposed to strengthen the research on the basic theory, according to China's actual situation, we should boldly study and adopt new technology and process, it is necessary to study the production process of nanometer tungsten carbide powder which is suitable for the situation of our country and has the world's leading level.

If you have any inquiry of tungsten, please feel free to contact us:
Tel.: +86 592 5129696/+86 592 5129595
Fax: +86 592 5129797

Scan QR code of Chinatungsten Wechat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.

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