Production line for producing high-grade direct zinc oxide and technical process of production line

Abstract

A production line for producing high-grade direct zinc oxide comprises a furnace body. An uptake is arranged in the middle of the furnace body, is perpendicular to the furnace body and is connected with an oxidization chamber. The oxidization chamber is perpendicular to the furnace body and is connected with a flue which is connected with a waste gas dust collection system and a dust collection chamber. The dust collection chamber is sequentially connected with a cooling chamber, a pulse dust collector, a fan, a desulfurizing tower and a chimney. The furnace body adopts a chain-type grate furnace structure. A slag scraping and breaking system is arranged in the furnace body. Ore briquette feeding systems are arranged on the two sides of the furnace body. A technical process of the production line is characterized in that a chain-type grate furnace intermittent operation process is adopted, namely static smelting and dynamic slag discharging are conducted intermittently; and smoke is gathered in the uptake, slag scrapping, discharging and breaking are conducted synchronously, and feeding is conducted on the two sides of the furnace body at the same time through ore briquette feed trolleys. The production line and the technical process have the high production efficiency of a rotary kiln method and the capacity to product high-grade direct zinc oxide of a Webster method, and thehigh-grade direct zinc oxide is efficiently produced at a low cost.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a production line for producing high-grade direct method zinc oxide and a process flow thereof. Background technique [0002] The direct method of zinc oxide is smelted from zinc calcine and zinc ore raw materials directly through the reaction process of fire method through reduction and oxidation, and the corresponding indirect method of zinc oxide is to smelt zinc calcine and zinc ore first Zinc ingots are produced by heating, smelting, evaporating and oxidizing zinc ingots. Because of the intermediate smelting process, it is called the indirect method. At present, the method of direct method to produce zinc oxide generally adopts Webster furnace production method and rotary kiln production method. For a long time, the high-grade direct method zinc oxide is smelted and produced with zinc calcine as raw material using the Webster furnace production line. Anoth...

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Problems solved by technology

[0003] However, using the Webster furnace production line to produce high-grade direct method zinc oxide, although the production target of making high-grade direct method zinc oxide can be realized, its production method is intermittent operation type, manual operation, labor intensity is large, and heat The radiation is large and the requirements for labor force are high. Affected by manpower capacity, the general furnace area is 6 to 12 square meters. According to the Webster furnace with a furnace area of ​​12 square meters, the feeding of each furnace can reach up to 2.7 tons, and nine furnaces per day can reach 24.3 tons. The per capita feeding amount is 0.52 tons, the direct recovery rate of zinc is less than 90%, the daily output of direct method zinc oxide per production line is less than 8 tons, and the per capita shift output is less than 0.14 tons of zinc oxide. The production efficiency is low, the production cost is high, and it is affected by human operation. The quality of feeding and raking slag is generally unstable. Sometimes the bottom coal fed in is uneven and lumps of ore pile up, and the raking slag will be unclean, resulting in unstable smelting process, which can easily lead to a decline in product recovery and product quality. decline, use the rotary kiln production line to produce direct method zinc oxide, and the production is continuous, which can overcome the disadvantages of small processing capacity, low production efficiency and high production cost of the Webster furnace production line, but due to continuous feeding and continuous smelting, it is impossible to design waste gas The dust collection system and the exhaust gas process are operated, and the kiln is continuously turned over during the production process to generate mechanical dust. The quality of the produced products is poor, and the product zinc oxide is of low grade and poor color. Compared with the traditional Webster furnace, this method only improves production efficiency. , the product quality level is much lower than that produced by the Webster furnace production line, and the consumption of coal and other auxiliary materials such as lime is the same, so it is used to produce direct method zinc oxide, especially high-grade zinc oxide. This method has very obvious defects , unable to produce high-grade zinc oxide

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