Reverse cleaning system and reverse cleaning method of ceramic filter in iron ore dehydration

Abstract

The invention provides a reverse cleaning system and a reverse cleaning method which are applicable to reverse cleaning of a ceramic filter in a concentrated iron ore slurry dehydration process. The reverse cleaning system comprises a filtrate pool, a sewage treatment unit, a pipeline switching unit and a cleaning pump, wherein the filtrate pool is connected with the sewage treatment unit and the cleaning pump by the pipeline switching unit respectively; when filtrate water meets a preset cleaning water quality requirement, the pipeline switching unit controls the filtrate pool to be communicated with the cleaning pump; and when the filtrate water does not meet the preset cleaning water quality requirement, the pipeline switching unit controls the filtrate pool to be communicated with the sewage treatment unit. According to the reverse cleaning system and the reverse cleaning method, the filtrate water of the ceramic filter is recycled, so that the filtrate water pumped by the ceramic filter is used effectively; an industrial water demand is reduced; the quality of the cleaning water is ensured by detecting the water quality of the filtrate water in real time; and the purification cost of industrial sewage is lowered.

Description

technical field [0001] The invention relates to the field of dehydration and cleaning of ceramic filters, and more specifically relates to a backwashing system and a backwashing process of a ceramic filter used in the dehydration process of fine iron ore pulp. Background technique [0002] In the prior art, during the dehydration process of fine iron ore pulp, a filter is used to dehydrate the fine iron ore pulp. Ceramic filter is the most commonly used filtering device. The filtrate water extracted by this kind of ceramic filter after demineralization is generally It is directly discharged, and this kind of ceramic filter itself also needs to carry out corresponding backwashing operation to ensure that it can be used continuously after completing the dehydration of the fine iron ore slurry. In the prior art, the backwashing of this kind of ceramic filter Generally, special industrial cleaning water is used. Some of this industrial cleaning water comes directly from industri...

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Problems solved by technology

[0002] In the prior art, during the dehydration process of fine iron ore pulp, a filter is used to dehydrate the fine iron ore pulp. Ceramic filter is the most commonly used filtering device. The filtrate water extracted by this kind of ceramic filter after demineralization is generally It is directly discharged, and this kind of ceramic filter itself also needs to carry out corresponding backwashing operation to ensure that it can be used continuously after completing the dehydration of the fine iron ore slurry. In the prior art, the backwashing of this kind of ceramic filter Generally, special industrial cleaning water is used. Some of this industrial cleaning water comes directly from industrial pumped water, and some industrial sewage is purified and treated as cleaning water. Among them, this industrial sewage includes demineralization pumping out of filters. filtrate water and other industrial production sewage, this ceramic filter backwashing method in the prior art has the following defects: (1) if directly adopting clear water then not only increased the cost, but also caused serious waste of water resources; ( 2) If the purified industrial sewage is used for backwashing, although it plays a certain role in the recycling of water resources, the purification of industrial sewage will increase the cost, especially for the filtrate water pumped out by the ceramic filter. Utilization, which in turn leads to an increase in the cost of backwashing water for ceramic filters

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