Method for joint production of potash alum or ammonium alum and polyaluminium chloride

A technology of polyaluminum chloride and potassium alum, which is applied in the direction of aluminum chloride, aluminum halide, aluminum sulfate, etc., to achieve the effects of low production cost, less consumption, and reduced environmental pollution

Inactive Publication Date: 2009-05-13
王声如
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And produce ammonium alum with am

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  • Method for joint production of potash alum or ammonium alum and polyaluminium chloride

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[0020] 1. Take 2 tons of alum mud and 2 cubic meters of recovered liquid, put them into the beating tank, start the beating machine for beating, send the beaten slurry into the reactor, add 3 cubic meters of recovered liquid to dilute, and then add 2.6 tons of 93wt. % sulfuric acid, (sulfuric acid concentration 31.8%) reacted, after 12 hours of reaction, the reaction solution was properly diluted and placed in the crystallization tank, naturally settled and cooled to crystallize, separated aluminum sulfate solution and potassium alum, and the sediment at the bottom of the pond was washed, and the potassium alum was recovered , The slag is discarded, and the washing liquid is recovered. Add 0.54 tons of ammonium chloride to the above-mentioned obtained aluminum sulfate solution to react, leave it to stand for aging crystallization, separate the liquid from the solid, the solid is ammonium alum, and the liquid is aluminum trichloride, so that the ammonium alum does not contain al...

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Abstract

The invention relates to a method for co-producing potassium alum or ammonia alum and polyaluminium chloride, which comprises the following steps: taking alum sludge as raw material, adding water or recovery liquid to the alum sludge to pulp; then adding sulfuric acid with the concentration being more than or equal to 93 wt. percent and water or recovery liquid to alum sludge paste; reacting for 10 to 14 hours under the condition that the concentration of the sulfuric acid is 30 to 35 wt. percent; settling, separating and obtaining the solid potassium alum and aluminum sulfate solution; adding equivalent ammonium chloride or potassium chloride to the aluminum sulfate solution; stirring and reacting for 5 to 6 hours; and settling, separating and obtaining the solid potassium alum and the aluminum sulfate solution. The aluminum sulfate solution is used for preparing the polyaluminium chloride. The invention co-produces the potassium alum, the ammonia alum and the polyaluminium chloride during the whole reaction process by utilizing idreaction through taking the alum sludge, the sulfuric acid, the potassium chloride, the ammonium chloride and the aluminum ash as raw materials, so that the potassium chloride and the alumina in the alum sludge can be fully utilized, and the policies of cyclic utilization of resources, energy conservation and drainage reduction are really executed.

Description

1. Technical field [0001] The invention relates to a method for comprehensive utilization of three wastes, in particular to a method for comprehensive utilization of industrial waste residues. To be precise, it is a method for co-producing potassium alum or ammonium alum and polyaluminum chloride with the waste residue (aluminum sludge) produced by the production of potassium alum as raw material. 2. Background technology [0002] Domestic production methods of potassium alum include: potassium alumite method, bauxite method, nepheline method, aluminum oxychloride method. The aluminum oxychloride method is to hydrolyze the aluminum oxide powder with sulfuric acid to obtain liquid aluminum sulfate, and then add an equivalent amount of potassium chloride and sodium sulfate to the liquid aluminum sulfate to obtain potassium alum. In order to prevent trichloride in the product Aluminum affects product quality, and the consumption of sodium sulfate must be increased by 10%. Thi...

Claims

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Application Information

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IPC IPC(8): C01F7/76C01F7/56
Inventor 王声如
Owner 王声如
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