"Third metal" magnesium: new material industry

Fly ash and coal gangue, in the eyes of energy scientists, because the calorific value is very low or even no burning fever, the value is very low, even waste, fly ash also need to spend money to deal with. Magnesium smelting will byproduct of some reduced slag, but these reduced slag because of the high temperature treatment, can be used as artificial soil matrix, Japan has used magnesium smelting slag as fertilizer and artificial soil, the effect is very good.

The period of "the first and second five-year plan" is the pivotal period of China's material industry from big to strong. In the eye of building materials scientist, fly ash value also not outside every tons dozens of yuan, won't exceed 100 yuan. Magnesium alloys can also replace engineering plastics.

"Third metal" magnesium: new material industry

. The other is the reducing agent, which is to replace magnesium from the ore, generally with silicon, aluminum or silicon aluminum alloy to act as, commonly used ferrosilicon, ferrosilicon, aluminum and so on, need to be extracted by electricity. However, for metal magnesium, fly ash and coal gangue can be used as raw materials for refining silicon and aluminum reducing agent, which can realize waste utilization. Therefore, the smelting process of magnesium requires high energy consumption. In this sense, magnesium itself is a product of high energy load and high energy storage. Electricity in our country is generally produced from coal. China, as a major country in steel metallurgy and aluminum metallurgy, is in a disadvantageous position in value distribution because of the shortage of iron ore and bauxite resources and long-term dependence on foreign countries. China's metal magnesium resources have a significant upside. Silicon aluminum alloy in the market demand is not large, but when used in magnesium smelting, it is an excellent metal reducing agent, can be very good in the dolomite and other magnesium mineral replacement reduction. However, after the production of magnesium alloy, because of its light weight, the use process can be energy-saving, recycling is also very energy-saving, and there is no pollution. Magnesium mineral resources are extremely rich, and available magnesium mineral resources account for 70% of the global proportion, from dolomite everywhere on the land, to magnesite, serpentine, talc, to abundant magnesium ions in seawater and salt lakes, and considering waste magnesium recovery in the future, China's magnesium resources can be said to be inexhaustible. Each ton of metal primary magnesium or electrolytic aluminum, the price is about 16,000 yuan, the energy consumption of both is commensurate, but each ton of electrolytic aluminum in alumina raw materials to spend about 5,000 yuan, and each ton of metal magnesium used dolomite ore value is only a few hundred yuan. If it is used to fill pits formed after mining, artificial soil can be reclaimed for agriculture. Magnesium, for example, announced earlier this year, the new material industry "twelfth five-year" development plan ", clearly put forward to accelerate the development of magnesium alloy preparation and processing technology, and promote its application in the field of auto parts and railway train, etc, by 2015, China will produce 150000 tons of high-strength magnesium alloy die casting and molding and plate yield ability. In the eyes of metallurgical scholars, fly ash and coal gangue are associated mines of silicon and aluminum, which belong to urban mines and renewable resources. If well utilized, they can become raw materials for high-value products of tens of thousands of tons per ton, and their value reaches nearly ten thousand yuan. We should vigorously develop the metal magnesium which has the upper hand in resources. As the main metal material, it can replace steel, aluminum and engineering plastics. Magnesium and magnesium alloys have the advantages of light weight, high strength, good thermal conductivity, vibration and noise absorption, easy recovery, and little environmental pollution. They have important application value in automobile and other vehicles manufacturing, mechanical electronics, aerospace, national defense and other fields, and are known as "the green environmental protection material of the 21st century". Two kinds of raw materials are needed to develop the recurrent refining process of magnesium smelting. One is magnesium-containing ore, which is widely distributed and abundant in China. It is understood that some heavy equipment technology in the steel industry has been applied to the magnesium industry. It can be expected that in the near future, China's magnesium industry will undergo revolutionary changes and become a modern big industry. In the process of mining coal and burning coal for power generation, a lot of coal gangue and fly ash will be by-produced, which are wastes and pollutants. Fly ash, coal gangue can use coke, bituminous coal and other carbon reducing agent in high temperature metallurgy furnace reduction, born silicon aluminum alloy. From the perspective of natural resources, it is generally believed that iron and steel mineral resources can be used for 100 years, aluminum mineral resources can be used for 300 years, and magnesium metal production capacity can be used for more than 1000 years, so magnesium metal is called the "third metal". Magnesium alloy and aluminum alloy are called light alloy together. They have the possibility to replace each other in many aspects, and their market also has the characteristics of sharing.