Guangxi Metallurgical Research Institute has achieved a major breakthrough in the extraction process of rare earth

The new network in Nanning, December 10 electric (Li Xingping Guo Dan Qi) Guangxi Nonferrous Metals Group's Guangxi Institute of Metallurgy, through the reform process and the extraction conditions, the oxidation of scandium extraction process to achieve a major breakthrough. Currently, the process is undergoing a productive test. Extraction of rare metals scandium oxide from spent acid by-product of titanium white powder manufacturing plant with an organic extraction method, from the seventies and eighties of the last century, has been in use ever since, and is still one of the main methods of scandium extraction of raw materials. The processes commonly used at home and abroad are directly extracting cerium from the waste acid with an organic solution and purifying it to obtain cerium oxide. Since the concentration of cerium in the raw liquid is not high enough, the extraction cost is high, and it is obviously not suitable for the market.

Through the research, Guangxi Metallurgical Research Institute has improved the original process. The improved process is to add an inexpensive reagent in the process of environmentally treating waste acid, and preconcentrate the lanthanum element. After enrichment, the concentration of lanthanum can be increased by 5-6 times, and then the extraction and separation of hydrazine is performed. Improve the extraction efficiency of hydrazine. At the same time, it can directly extract vanadium under titanium-containing conditions, optimize the extraction conditions of vanadium in titanium white waste acid, and comprehensively recover more than 70% of titanium dioxide and vanadium pentoxide, which greatly reduces the extraction cost of rhodium. Production creates conditions. At present, there are more than 50 titanium dioxide production plants in China. Most of them use the sulfuric acid production process. The acid waste water discharged from the production is the main “three wastes” pollution source of titanium dioxide enterprises, and it has become a constraint to the sustainable and healthy development of the titanium dioxide industry. problem. Among them, there are only 15 existing sulfuric acid titanium dioxide production plants in Guangxi, with an annual output of more than 250,000 tons of titanium dioxide, and an annual output of more than 1.25 million cubic meters of waste acid. By adding a small amount of reagents, complexing agents, etc., in addition to recovering ruthenium, vanadium pentoxide, titanium dioxide, etc., it is also possible to comprehensively recover Fe3+ and SO42- in waste acid, and by adding lime powder to neutralize by-products. Gypsum , the treated waste acid basically meets the environmental emission standards, saves a lot of environmental protection funds, and can fundamentally solve the problem of environmental protection of waste acid in titanium dioxide factory. Rare earth lanthanum is a rare and precious metal used in the manufacture of new materials such as luminescence, laser, magnetic materials and catalysts. It is widely used in aerospace, electronics, nuclear power generation and other fields. With the continuous support of the state for the new materials industry and the continuous development of emerging industries, the market demand for sputum has expanded dramatically.

According to incomplete statistics, from 2000 to 2006, the average annual growth rate of cerium oxide was 11.84%. It is estimated that the average annual growth rate of cerium oxide consumption in 2007-2010 is 16%. From 2008 to 2010, the consumption of Sc203 in China accounted for about 25% of the world's total consumption. In foreign countries, the recent development of manufacturing an aluminum alloy and scandium applied to a solid oxide fuel cell, so that a substantial increase in the demand scandium. The abundance of cockroaches in nature is low and highly dispersed. There is only 5 grams per ton of crustal material. The cost of development and utilization alone is high, and comprehensive recycling can reduce costs. Since the extraction of rare metal cerium oxide from the waste acid by-product of the titanium dioxide production plant is one of the most important sources of the current bismuth raw materials, the process also has a very large marketing value. If the new process is extended to the whole region of Guangxi, according to the annual waste acid content of titanium dioxide is 1.25 million tons, the waste acid can be recovered annually for 12.5 tons of yttrium oxide products, 500 tons of vanadium pentoxide products, and 2,000 tons of titanium dioxide products. Ton, iron products 44,000 tons, output value of 244 million yuan. Gypsum by-products in governance will also generate significant economic benefits. Experiments have shown that every 1 cubic meter of waste acid will produce 0.4-0.5 tons of by-product gypsum. At present, the capacity of cement enterprises in Guangxi is about 70 million tons per year, and the amount of gypsum is 4% for 1 ton of cement. If it is used for cement production, only one gypsum will generate economic benefits of RMB -150 million per year.

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