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In film and photography industries, since the silver halide salts (silver bromide, silver chloride, silver iodide) and silver nitrate sensitive to light having particular characteristics, so can be used to make black and white movies, and TV camera with the required Various special photographic materials used in color film, film, sun and photographic paper, photographic film for printing and plate making, X-ray film for medical and industrial flaw detection, and aerial mapping, astronomical space exploration and national defense scientific research.
Electromechanical and electrical industries, silver is mainly used as an electrical contact material in the form of pure metal, silver alloy, resistive material, solder, temperature thick film paste material and the like. The silver-copper, silver-cadmium, silver-nickel alloy such as electrical contacts made can be modified to eliminate the consumption of metals in general, and other ills contact resistance and adhesion; silver tungsten, molybdenum, silver, silver alloy, iron-made low-voltage power switch, from Heavy-duty, heavy-duty relays and electrical contact materials can be widely used in cutting-edge industries such as transportation, metallurgy, automation, and aerospace. In thick film processes, silver paste is the earliest used, has the best conductivity, and has strong adhesion to ceramics. .
In the petrochemical industry, silver is mainly used for chemical reactions using catalysts such as Ag/Al 2 O 3 , KBr-Ag-Al 2 O 3 , and Au-Ag networks.
In the medical and health undertakings, silver gold, silver mercury , silver tin alloy, etc. are important dental materials; Yinbo Dan and Zhenxin Pill have the functions of dedication and vitality; silver gauze and cotton wool can cure malignant ulcers; silver thread, Silver tablets are very useful for fixing broken bones and repairing skull holes. Silver salt has a good bactericidal effect. Silverware has a special role.
In agriculture and meteorology, silver iodide is used for artificial rainfall.
In energy use, silver is applied to a large curved glass mirror that collects sunlight and converts it into heat and electricity. Silver- zinc and silver-cadmium batteries are 20 times stronger than ordinary batteries. In addition, silver-coated glass windows prevent UV rays from passing through, saving energy and equipment costs.
Since China's independent silver deposits were not found before the 1980s, most of the silver is the companion (co-) component of the non-ferrous strontium metal ore. When the main minerals were surveyed, the silver content was more than 5-10g/ At t, the calculated reserves are given. If silver smelt better performance is sometimes reduced to 1g / t, for zinc lead 2g / t of copper and gold.
With the development of national economic construction, the geological work of silver mines has been strengthened. Since the 1980s, a number of silver-based deposits have been found. According to the current technical and economic conditions, the industrial indicators and regulations for silver deposits are as follows:
Boundary grade A40～50g/t
Industrial grade Ag100～120g/t
The average grade of the deposit is Ag140～150g/t
Available thickness 0.8~1m
The thickness of the stone is ≥2~4m
At present, the industrial indicators of several major deposits with proven industrial reserves in China are shown in the table below.
Use of silver and technical and economic indicators
For a long time, a large amount of high purity silver has been used to make silver coins and decorations. With the development of science and technology, silver has gradually shifted from the consumption of traditional currency and jewelry crafts to the application and development of industrial technology. At present, it has been widely used in electronics, computer, communications, military, aerospace, film and television, photography and other industries.
Industrial indicators of several major silver mines in China
Deposit name
Boundary grade (g/t)
Industrial grade (g/t)
Available thickness (m)
Stone removal thickness (m)
Yinluling, Jiangxi
40
100
0.6
2
Yindonggou, Hubei
60
120
1.2
2
Shandong Shilibao
50
100
0.8
2
Henan broken mountain
50
120
1.0
4
Zhejiang Yinkeng
50
100
0.8
2