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Method for producing high-purity colorless transparent polyaluminum chloride by using aluminum ash

A polyaluminum chloride and aluminum ash technology, applied in aluminum chloride, aluminum halide and other directions, can solve the problems of high quality requirements of raw and auxiliary materials, no method for removing impurities such as iron and calcium, and high cost, so as to improve operational safety. , the effect of improving flexibility and expanding the range

Pending Publication Date: 2021-03-19
四川科龙达环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process still uses aluminum hydroxide and industrial hydrochloric acid, and the calcium aluminate used is obtained through the high-temperature reaction of calcium carbonate or calcium hydroxide and aluminum hydroxide, which has high requirements on the quality of raw materials and auxiliary materials, and the cost is still high
At the same time, the invention only controls product quality from the quality of raw and auxiliary materials, and does not provide a method for removing impurities such as iron and calcium brought in by raw and auxiliary materials

Method used

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  • Method for producing high-purity colorless transparent polyaluminum chloride by using aluminum ash
  • Method for producing high-purity colorless transparent polyaluminum chloride by using aluminum ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Add 15 tons of by-product hydrochloric acid (20-30% hydrogen chloride content) into the acid leaching reactor, slowly add 5 tons of aluminum ash, and the feeding time is 3 hours. After feeding, the reaction was continued for 1 hour at a reaction temperature of 50°C. The mixed material is pumped into the underflow plate frame for solid-liquid separation. The separated liquid is a mixed solution of impurities such as aluminum trichloride, hydrogen chloride, water and iron, 17 tons.

[0037] (2) Add 17 tons of pickling liquid into the decolorization reaction kettle, add 0.01 tons of sodium chlorate, and stir for 1 hour. Then add 0.02 tons of waste aluminum chips, and stir for 1 hour. Filter through plate and frame to obtain 16.5 tons of colorless and transparent acid dipping solution.

[0038] (3) Add 16.5 tons of colorless and transparent acid immersion solution into the synthesis reaction kettle, heat it with steam to 60°C, then slowly add 1.4 tons of calcium oxid...

Embodiment 2

[0041] (1) Add 20 tons of industrial hydrochloric acid to the acid leaching reactor, slowly add 6.5 tons of aluminum ash, and the feeding time is 4.5 hours. After feeding, the reaction was continued for 2 hours, and the reaction temperature was 60°C. The mixed material is pumped into the underflow plate frame for solid-liquid separation. The separated liquid is a mixed solution of impurities such as aluminum trichloride, hydrogen chloride, water and iron, 23.5 tons.

[0042] (2) Add 23.5 tons of pickling solution into the decolorization reaction kettle, add 0.07 tons of sodium hypochlorite, and stir for 2 hours. Then add 0.05 tons of waste aluminum, and stir for 2 hours. Through plate and frame filtration, 23 tons of colorless and transparent acid dipping solution were obtained.

[0043] (3) Add 23 tons of colorless and transparent acid dipping solution into the synthesis reaction kettle, heat it with steam to 80° C., then slowly add 4 tons of calcium carbonate for 4 hours, s...

Embodiment 3

[0046] (1) Add 10 tons of industrial hydrochloric acid to the acid leaching reactor, slowly add 3.5 tons of aluminum ash, and the feeding time is 2.5 hours. After feeding, the reaction was continued for 1 hour at a reaction temperature of 70°C. The mixed material is pumped into the underflow plate frame for solid-liquid separation. The separated liquid is 12 tons of mixed solution of impurities such as aluminum trichloride, hydrogen chloride, water and iron.

[0047] (2) Add 12 tons of pickling solution into the decolorization reaction kettle, add 0.08 tons of hydrogen peroxide, and stir for 3 hours. Then add 0.02 tons of metal aluminum powder, and stir for 3 hours. Filter through plate and frame to obtain 11.5 tons of colorless and transparent acid dipping solution.

[0048] (3) Add 11.5 tons of colorless and transparent acid immersion solution into the synthesis reaction kettle, heat it with steam to 80°C, then slowly add 1.8 tons of sodium carbonate for 3 hours, and stir...

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Abstract

The invention discloses a method for producing high-purity colorless transparent polyaluminum chloride by using aluminum ash. The method comprises the following steps: (1) mixing the aluminum ash withindustrial hydrochloric acid or byproduct hydrochloric acid, and filtering; (2) mixing the filtered pickle liquor with a catalyst and a decolorizing agent, and then filtering; (3) mixing the pickle liquor obtained in the step (2) with a basicity regulator to obtain a polyaluminium chloride solution; and (4) adsorbing the polyaluminium chloride solution by using an adsorbent to obtain the high-purity colorless transparent polyaluminium chloride solution. According to the process, through decoloration, impurity removal and adsorption of the product, the quality of the colorless transparent polyaluminium chloride is controllable in the production process, and the colorless transparent calcium-free high-purity polyaluminium chloride solution can be produced by adopting cheap raw materials.

Description

technical field [0001] The invention relates to the technical field of water treatment additives, in particular to a method for producing high-purity colorless and transparent polyaluminum chloride by using aluminum ash. Background technique [0002] The main components of aluminum ash are alumina, aluminum nitride, metal aluminum, salts and other components. After harmless treatment, it can be used as a raw material for aluminum-based water purifiers, such as the production of polyaluminum chloride. [0003] The traditional production of polyaluminum chloride by using aluminum ash is to mix aluminum ash and industrial hydrochloric acid in a certain ratio, usually 1:2, and mix and stir for a certain period of time, then add water to dilute, after aging for a certain period of time, release the supernatant, which is a liquid Polyaluminum chloride, after drum drying or spray drying, is solid polyaluminum chloride. Because aluminum ash contains a large amount of impurity eleme...

Claims

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Application Information

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IPC IPC(8): C01F7/56C01F7/62
CPCC01F7/56C01F7/62
Inventor 张志刚田咏梅龙泽斌
Owner 四川科龙达环保股份有限公司
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