Guangzhou smelting stone currently uses the pre-refining selection-electric furnace smelting process (see the figure below).
In the picture, the tin smelting process of the electric smelting plant in Guangzhou
The Guangzhou Smelter was built in 1962. It is the first factory in the country to use electric furnaces for tinning. The tin sand from the provinces of Guangdong, Hunan, Jiangxi and other provinces is more than 70 mining areas and group mining. The mineral resources are scattered, the quality is different, and the impurities are variable. . The tin in the plant is mainly tin, most of which are in the state of monolithite. The chemical composition (%) is: 44-46Sn, 0.001-8Bi, 0.1-23WO 3 , 0.02-7.0Pb, 0.02-1.6Cu, 1.0. -21Fe, 0.02-13As, 0.05-8S, 2-25SiO 2 , 0.5-5Al 2 O 3 , 0.5-6CaO. According to the impurity content, tin sand is roughly divided into three categories, the general composition is shown in Table 1, and the typical mineral sample components are shown in Table 1-2-6. See related information in process, the high tungsten high-lead, bismuth, arsenic, sulfur, tin sand, after mixing before the after-treatment into the furnace, wherein the high lead, bismuth, tin sand (see Table 2) produced in the flotation process The tin ore (not shown) contains arsenic, sulfur, iron , lead and antimony, and is baked into the furnace after roasting-acid leaching.
Table 1 Various types of tin sand in Guangzhou smelting plant / %
Tin sand category | Sn | Pb | Bi | As | S | Fe | WO 3 |
Tin sand directly into the furnace | >60 | <0.8 | <0.4 | <0.5 | <1.0 | <7 | <3 |
High tungsten tin sand | 44-55 | 0.5-5 | 0.1-6 | 0.5-7 | 0.5-3 | 8-16 | 3-23 |
High-lead, lead, arsenic, sulfur tin sand | 41-66 | 1-7 | 0.5-8 | 2-13 | 1-8 |
Table 2 Typical mineral sample composition of Guangzhou smelter
Tin sand ore category | Sn | Fe | S | As | Pb | Bi | WO 3 | |
High arsenic and sulfur tin sand | 50-60 | 4-16 | 1-5 | 2-10 | 0.1-3 | 0.03-0.3 | 1-3 | |
High lead, antimony tin sand | number 1 | 45-60 | 6-10 | 4-5 | 0.7-3 | 1-3 | 3-4.5 | 3-7 |
number 2 | 41-45 | 6-10 | 2-4 | 3-5 | 1.5-4 | |||
High lead tin sand | number 1 | 50-62 | 4-12 | 1-10 | 0.5-2 | 3.1-5.8 | <0.1 | |
number 2 | 64-66 | 4-6 | 0.2 | 0.3-0.5 | 2-4 | <0.1 | ||
High tungsten tin sand | High white tungsten | 41-47 | 1-1.5 | 0.2-0.6 | 0.3-0.75 | 0.05-0.3 | 0.06-0.2 | 2.5-5 |
High black tungsten | 44-50 | 3-4 | 0.4-1.0 | 0.3-0.5 | 1.6-3.2 | 0.1-0.3 | 16-21 | |
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