Crushing process of alumina crusting block and production line thereof

Abstract

The invention relates to a crushing process of an alumina crusting block generated during the first-stage electrolytic aluminum production and a production line thereof. The crushing process includes the following steps: feeding, grinding, material separating, air supplementing, material collecting, dust collecting and material storing. As to the production line for realizing the crushing process of the alumina crusting block, a mechanical part comprises a raw material bin, a feeding machine, a grinding machine, a sorting machine, a cyclone dust collector, a bag type dust collector, a chute and a finished product bin which are sequentially connected with each other; an electric control part comprises an IPC (industrial personal computer), a PLC, a frequency changing and speed regulating system, an acousto-optic alarm display system and a sensing system. The crushing process and the production line thereof in the invention achieve the standard discharging granularity that usually 2/3-stage can achieve, increase the production efficiency, reduce consumption, and can timely recycle the alumina crusting block at the same time.

Description

technical field [0001] The invention relates to a crushing technology, in particular to a crushing process and a production line for crushing alumina crust blocks generated in the production process of primary crushing electrolytic aluminum. Background technique [0002] In recent years, the electrolytic aluminum industry has developed rapidly. Statistics show that since 2001, the domestic demand for electrolytic aluminum has grown at a rate of 1 million tons per year; by the end of 2003, the production capacity of electrolytic aluminum had reached 8.34 million tons; by 2008, electrolytic aluminum The production capacity has reached 12.5 million tons. With the rapid growth of electrolytic aluminum production in my country, the amount of alumina crusts left over by electrolytic aluminum enterprises in production has also increased. However, the research and development status of domestic alumina crust crushing technology is limited to the rectification and improvement of ind...

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Problems solved by technology

[0004] 2. Use Raymond mill to grind alumina crust into powder, but there are problems of low efficiency and poor material control, which are mainly reflected in 1. When the hardness of alumina crust is high, Raymond mill can grind The speed is too slow, and the Raymond mill itself is also severely worn; 2. When the water content of the alumina crust is large, it is easy to adhere to the Raymond mill, and it is also easy to block during the feeding and conveying process, resulting in Raymond The production capacity of the mill is reduced; 3. When the fineness of the alumina crust block is required to be high, the Raymond mill has a small grinding capacity; 4. When the alumina crust block is mixed with fine powder before grinding, it needs Pass through a sieve in advance; otherwise, these fine powders are easy to adhere in the Raymond mill and affect the transportation of the ground material; 5. The structure of the Raymond mill itself, the wear resistance of the hammer head and the jaw plate determine the Raymond mill The grinding capacity of the Mongolian mill, so it is difficult to adapt to the development requirements of large industries

[0005] According to the above, because the electrolytic aluminum enterprises generally adopt the outdated processing technology of alumina crusts, the processing efficiency of the above method is low, the equipment failure rate is high, the degree of automation is low, the workload of equipment maintenance and repair is large, and the labor intensity of workers is high. Moreover, factors affecting large-scale industrial production such as the destruction of the environment of the electrolysis workshop; the output of alumina crusts is much higher than the recovery volume, forming a large backlog, resulting in transportation and storage costs, crushing and processing costs of alumina crusts, and The maintenance cost of the equipment used is extremely high, so there is an urgent need for a crushing process of alumina crust block and its production line suitable for large-scale industrial production

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