Polyaluminium chloride production first-step reaction system with efficient pressure filtration

Abstract

The invention discloses a polyaluminium chloride production first-step reaction system with efficient pressure filtration. The system comprises a reaction tank, a transit tank of the reaction tank, a flocculant preparation tank, pressure filters and first-step liquid tanks. The reaction tank is provided with a bauxite charging hole and an acid liquid charging hole, and is communicated with the transit tank of the reaction tank. The flocculant preparation tank is communicated with the transit tank of the reaction tank. The transit tank of the reaction tank is communicated with inlets of the pressure filters through a first-step liquid mixing pump. Liquid outlets of the pressure filters are communicated with the first-step liquid tanks. The system can effectively control and reduce the content of insoluble matters in first-step liquid by separating the insoluble matters produced in acid dissolution reactions through coagulating sedimentation and pressure filtration, thus increasing the yield and improving quality of a polyaluminium chloride product. Through the extrusion effect of pressure filtration units in the pressure filter, the pressure filtration effect can be improved. The system is further provided with an automatic monitoring and control system and parallel-connected pipelines, so that automatic monitoring and control are achieved, the parallel-connected pipelines are subjected to step-by-step overhaul, and continuous and automated production is achieved.

Description

technical field [0001] The invention belongs to the technical field of polyaluminum chloride production and relates to a one-step reaction system for high-efficiency filter press polyaluminum chloride production. Background technique [0002] Polyaluminum chloride, commonly known as water purifying agent, also known as polyaluminum chloride, referred to as polyaluminum, English name PAC; it is a cationic inorganic polymer flocculant of polyhydroxyl and multinuclear complexes, and the appearance of solid products is red Brown, yellow or white solid powder, its chemical formula is [AL2(OH)nCL6-n]m (wherein, 1≤n≤5, m≤10), where m represents the degree of polymerization, n represents the neutrality of PAC products It is easily soluble in water and has strong bridging and adsorption properties. During the hydrolysis process, it is accompanied by physical and chemical changes such as electrochemistry, coagulation, adsorption and precipitation, and finally generates [AL2(OH)3(OH)3]...

AI Technical Summary

Problems solved by technology

The existing filter press generally only uses the adjustment of the feed pressure as the pressure source of the filter press, although it can meet the requirements of use, but with the development of the filter press equipment, the filter area of ​​the filter press continues to increase, and the filter plate The number is also increasing, which makes the length of the filter press continue to increase. If the pressure of the filter press is only provided by increasing the feed pressure of the feed pump, the filter cake cannot be pressed for a long time, and the production efficiency will be reduced.

[0015] In addition, because the length of the filter press continues to increase, it is impossible to ensure that all the filter chambers can be opened after the filter press is completed, resulting in that the filter residue cannot be removed smoothly. It is necessary to manually open the unopened filter chambers one by one and then remove the filter residue. Not only wasting manpower, but also reducing production efficiency

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