Environment-friendly control technology for tail water of sandstone factory

Abstract

The invention discloses an environment-friendly control technology for tail water of a sandstone factory. The environment-friendly control technology comprises the following steps of (1) washing of sandstone: washing the sandstone for building engineering, and collecting the tail water after washing; (2) separating and concentrating: separating and settling the tail water in step (1) by concentrating equipment, producing mud containing fine particles and siltized matter and primary clean water, conveying the mud into dewatering equipment of a press filter to make cakes, and returning the primary clean water back to a water supply system for further use; (3) primary dewatering and cake making: dewatering the settled mud in step (2) for the first time by a primary belt type press filter, andproducing primary dewatering mud cake and secondary clean water; (4) secondary dewatering and cake making: dewatering the primary dewatering mud cake in step (3) for the second time by a secondary belt type press filter, and producing secondary dewatering mud cake and secondary clean water; selecting a land for the secondary dewatering mud cake, storing for further use, and returning the secondary clean water back to the water supply system for further use. The environment-friendly control technology has the advantage that the pollution to the environment by the tail water and the occupationof land resources are fundamentally eliminated.

Description

technical field [0001] The invention relates to the technical field of environmental protection, and more specifically relates to an environmental protection treatment process for tail water of a gravel plant. Background technique [0002] In the production of construction sand and gravel, the sand and gravel must be crushed, screened, and washed to meet the needs of the construction market, and in the washing process, washing tail water (mud) composed of fine particles, mud, and water will inevitably be produced. , and these tail waters are often a mixture of solid and liquid, and are difficult to separate. After a large amount of accumulation, there are serious environmental protection hazards and hidden dangers. [0003] At present, for the treatment of tail water, the existing technology generally uses multi-stage sedimentation tanks to settle the washing tail water (mud), and adds chemical flocculants to accelerate the sinking of fine particles and mud to the bottom of ...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional process for tail water treatment often has the following defects: ①Environmental pollution, because the fine particles and mud after sedimentation are in the form of cement, and the quantity is large, generally a large area of ​​land is paved and dried for dehydration, resulting in a large amount of occupation At the same time, the fine particles after dehydration and drying will be dusted by the wind, affecting the production and life of nearby residents; It poses a safety hazard for nearby humans and animals; ③Drug hazards, the flocculants and dispersants in the tail water pollute the water body, which has different degrees of harm to humans and animals; ④Intermittent production, the sediment is cleaned regularly by excavators and other equipment, Production must be stopped and continuous operation is not possible; ⑤ The cost is high, and a large amount of flocculant and dispersant are required to be added to the tail water sedimentation, and the unit product cost is high

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