Method for producing special phosphate fertilizer for tower from industrial sludge

Abstract

The invention discloses a method for producing a special phosphate fertilizer tower for a tower from industrial sludge. The method comprises the following steps: (1) adding step: adding at least one of concentrated sulfuric acid, fuming sulfuric acid or phosphoric acid to the industrial sludge to form a sludge mixture; (2) mixing step: thoroughly mixing the sludge mixture in step (1); (3) ageing step: ageing the sludge mixture treated in step (2), and enabling the sludge mixture to fully react to convert the water into the sludge mixture to free water; (4) dewatering step: dewatering the sludge mixture treated in step (3) to separate the free water from the industrial sludge; and (5) drying step: drying the sludge mixture treated in step (4). By adding the concentrated sulfuric acid and the phosphoric acid, the invention has the beneficial effects of achieving the purpose of converting the sludge into the special tower phosphate fertilizer, and realizing simple process, high economic benefit and environmental protection.

Description

technical field [0001] The invention relates to a method for producing phosphate fertilizer special for high towers from industrial sludge, in particular to a method for producing phosphate fertilizers special for high towers from surface treatment sludge. Background technique [0002] The industrial sludge includes residues, residues, and sludge generated during phosphating, polishing, and chemical polishing of metal and plastic surfaces. It is included in the national list of hazardous wastes and belongs to the seventeenth category of hazardous wastes. Because industrial sludge contains a large amount of toxic and harmful substances, and each enterprise is unable to dispose of it independently, there are serious environmental safety hazards, which can easily cause secondary pollution to the environment and endanger human health. At present, most of the sludge generated by enterprises is temporarily piled up in the factory area, or mixed with other solid wastes, dumped or l...

AI Technical Summary

Problems solved by technology

Since industrial sludge contains a large amount of toxic and harmful substances, and each enterprise is unable to dispose of it independently, there are serious environmental safety hazards, which can easily cause secondary pollution to the environment and endanger human health.

At present, most of the sludge generated by enterprises is temporarily piled up in the factory area, or mixed with other solid wastes, dumped or landfilled, or illegally collected by unqualified individuals and units. The surface treatment sludge cannot be effectively treated, causing great damage to the environment. destroy

[0003] Under the prior art, the industrial sludge has the following two problems: on the one hand, there is about 80% to 85% water in the industrial sludge, and there is no effective way to separate the water in the industrial sludge, resulting in Industrial sludge is large in size and high in quality, which is not convenient for subsequent sludge treatment and utilization, and also causes great damage to the environment; on the other hand, if the industrial sludge is incinerated using traditional methods, a lot of manpower and material resources are required. and cannot generate any economic benefits

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