The QSL method is smelting in an oxygen-rich bottom blowing bath. The QSL furnace is a rotatable horizontal long cylindrical furnace and is inclined 0.5% in the direction of the lead discharge port, and is divided into an oxidation zone and a reduction zone. Oxidation and reduction in the two regions, with each oxygen nozzle submerged nozzle and pulverized coal. After the granulation, the lead concentrate is added to the oxidation zone from the top, and the oxygen injected from the oxygen lance is reacted in the molten pool to form lead oxide and SO 2 to realize self-heating smelting; lead oxide and lead sulfide are mutually reacted in the oxidation zone to generate one time. The crude lead is released from the bottom. Slag from the oxidation zone into the reduction zone, wherein the pulverized coal nozzle into PbO is the reduction of the pulverized coal, lead slag gradually decreased, while the output of the secondary lead and zinc oxide fume crude lead. The secondary crude lead is combined with the primary crude lead and the reverse movement of the slag is released from the other end of the reactor. To solve the mixed lead slag, the addition of a partition wall between the oxidation zone and the reduction stage, using the refractory casting magnesium chrome brick. The QSL method has been used in Stolberg, Germany, Wenshan, South Korea, Northwest China Smelter, and Terrell, Canada. Due to the difficulty in controlling the oxidation and reducing atmosphere in a furnace, the operation is difficult, and the lining erosion is fast. The gun has a short life span, slag blocking, and high smoke rate (about 25%). The Northwest China Smelter was put into operation in 1992. After more than 10 years of trial operation, the total operation was less than 12 months and the production was stopped. The Trelle smelter was completed in 1989. After the project was put into operation, a series of process and equipment problems occurred. The life of the spray gun was only 2 to 4 days. The lining was severely corroded. After being put into production for 3 months, it was forced to stop production and later transformed into the Kievert method. . After the trial run of South Korea's Wenshan, the oxidation and reduction were separated into two chambers, and production has been normal. Germany's Stolberg has undergone many technical transformations in the past 10 years and has been producing normally since then. Production practices in Korea and Germany have proven that QSL is still a successful direct lead smelting method. The characteristics are as follows: (1) The equipment is simple, and the production of crude lead is completed in one piece of equipment; (2) The material has good adaptability and can be used to treat secondary materials with high lead content such as battery paste and lead silver slag.
1 The electrical system used by the machine has reliable control performance and strong anti-interference ability.
2 High precision thrust ball bearing and tapered roller bearing are adopted in the spindle of machine, with high rotary precision and the large bearing capacity.
3 The machine tool has the function of two axis linkage, which can be used for turning various types of surfaces.
4 The speed of the worktable adopt two level of gears, gear reducer and motor with frequency converter to achieve stepless speed change, very convenient to adjust and operate.
5 The machine feed shaft adopts precision ball screw and linear guide rail, so that the machine has the characteristics of high precision and high rigidity.
6 The machine tool is equipped with five station electric knife, which has the function of automatic knife change.
7 The machine is equipped with large flow water cooling unit and high-lift pump to ensure good cooling effect.
8 The machine has closed housing (except the top of the slide), and the workspace is completely protected by screen seal. It can also easily open the protective door and is highly accessible when operation.
9 The machine use centralized lubrication, circular lubrication and other methods, supply oil to each lubricating point, reduce friction resistance, reduce temperature rise and reduce surface wear..
10 The Z shaft adopts the hydraulic balance oil cylinder to balance the weight of the slide table and the tool holder. The balance ability is strong and the stability is good, thus the life of the screw and the guide rail can be improved.
11 The operation procedures of the machine are very simple, the degree of automation is high, and the unstable factors of human error can be reduced to the lowest level.
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