Utilization method for polymeric aluminium reaction residues

A technology of polyaluminum chloride and residue, which is applied to the removal of aluminum chloride, aluminum halide, and solid waste, can solve the problems of limiting the dissolution rate of aluminum in calcium aluminate powder, reduce the content of water-insoluble substances, improve Effect of product quality and usage reduction

Active Publication Date: 2012-06-27
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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Problems solved by technology

The reasons for the analysis mainly include the following two points: (1) a small amount of polyaluminum chloride is carried in the residue; (2) the restriction of the production process conditions causes some aluminum in the calcium aluminate powder to not be completely dissolved, such as reaction temperature, reaction time Product quality requirements such as reaction conditions, product mud-water separation effect, and product water-insoluble content limit the dissolution rate of aluminum in calcium aluminate powder

Method used

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  • Utilization method for polymeric aluminium reaction residues

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The total acidity of the inorganic mixed acid in this example is 6% (in HCl mass fraction), which is formed by mixing 6% hydrochloric acid, 8% sulfuric acid and 5.4% phosphoric acid, and the mass ratio of the three is 80:1:1.

[0014] Add 3600kg of 5% mixed mineral acid in a 5000L reactor, add 600kg of polyaluminum chloride reaction residue successively under continuous stirring, heat and stir at about 50°C for 0.5 hours, then pour the reaction solution into a sedimentation tank for precipitation for 1 hour to obtain The supernatant liquid is the alumina-containing acid liquid, and the specific properties and characteristics of the sludge and the reaction liquid are shown in Table 1.

Embodiment 2

[0016] The total acidity of the inorganic mixed acid of this example is 8% (in terms of HCl mass fraction), which is formed by mixing 8% hydrochloric acid and 10.7% sulfuric acid, and the mass ratio of the two is 30:1.

[0017] Add 3600kg of 8% mixed mineral acid in a 5000L reactor, add 720kg of polyaluminum chloride reaction residue successively under constant stirring, heat and stir at about 70°C for 1 hour, then pour the reaction solution into the sedimentation tank for 0.5 hour precipitation, and obtain The supernatant liquid is the alumina-containing acid liquid, and the specific properties and characteristics of the sludge and the reaction liquid are shown in Table 1.

Embodiment 3

[0019] The total acidity of the inorganic mixed acid of this example is 12% (in HCl mass fraction), which is formed by mixing 12% hydrochloric acid, 16.1% sulfuric acid and 10.7% phosphoric acid, and the mass ratio of the two is 80:1:3.

[0020] Add 3600kg of 12% mixed mineral acid in a 5000L reactor, add 900kg of polyaluminum chloride reaction residue successively under constant stirring, heat and stir at about 90°C for 1.5 hours, then pour the reaction solution into a sedimentation tank for precipitation for 2 hours to obtain The supernatant liquid is the alumina-containing acid liquid, and the specific properties and characteristics of the sludge and the reaction liquid are shown in Table 1.

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Abstract

The invention relates to a technology for treating chemical wastes, in particular to a treatment and utilization method for polymeric aluminium reaction residues. The method comprises the following specific steps: (1) putting 4%-20% (by weight parts of HCl) of inorganic mixed acid and reaction residues in the weight ratio of 1:6-1:2 into reaction equipment, evenly mixing, and reacting while stirring at the temperature of 50-110 DEG C for 0.5-2h; and (2) throwing reaction liquid into a sedimentation tank for sedimentation for 0.5-2h or directly utilizing a filter-press to carry out solid-liquid separation, wherein the obtained clear liquid is aluminiferous acid liquor capable of being reused in the polymeric aluminium production process. The invention comprehensively utilizes the solid reaction residues, turns waste materials into things of value, reduces the yield of the solid residues in the polymeric aluminium production process, saves the handling expenses for the residues, reducesthe usage amount of calcium aluminate powder and bauxite in the polymeric aluminium production process, saves production cost and improves product quality.

Description

technical field [0001] The invention relates to a treatment technology of chemical waste, in particular to a treatment and utilization method of polyaluminum chloride reaction residue. Background technique [0002] At present, my country's polyaluminum chloride manufacturers mostly use the one-step method of acid-dissolving calcium aluminate or the two-step method of acid-dissolving calcium aluminate and bauxite to produce polyaluminium chloride. Due to the composition characteristics of calcium aluminate powder and bauxite Different from the process conditions, the final reaction liquid will contain a certain amount of water-insoluble residues, which need to be settled naturally, or added with a settling agent to accelerate the settling, or removed by filter press equipment. The conventional treatment plan for the final residue is: as a solid After paying a certain treatment fee, the waste will be handed over to the relevant environmental protection unit for treatment. For a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/56B09B3/00
Inventor 赵志萍王桂玉王振宇
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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