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Method for preparing polyaluminum chloride and coproducing polysilicate ferric aluminum chloride by using waste catalyst

A technology of polysilicon ferric aluminum chloride and waste catalysts, which is applied in the fields of aluminum chloride, chemical instruments and methods, aluminum halide, etc., can solve problems such as secondary pollution of water quality, and achieve the effect of increasing production income

Inactive Publication Date: 2020-01-10
山东聚杰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The above three methods have simple process routes, all of which are one-step acid hydrolysis and two-step acid hydrolysis; the three processes all provide a cheap synthetic route for the preparation of polyaluminum chloride, but the heavy metals Ni, V, Ti in the spent catalyst Hazardous elements such as , Pb, and Sb are easily brought into the product. If it is used in the water treatment industry, it may cause secondary pollution of water quality

Method used

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  • Method for preparing polyaluminum chloride and coproducing polysilicate ferric aluminum chloride by using waste catalyst
  • Method for preparing polyaluminum chloride and coproducing polysilicate ferric aluminum chloride by using waste catalyst

Examples

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Effect test

Embodiment 1

[0065](1) Mix 480ml of 15% sodium hydroxide solution and 100g of FCC waste catalyst in a stainless steel autoclave, set the stirring speed at 800rpm, heat up with electric heating, maintain the reaction temperature at 125°C and the pressure at 0.26MPa, and perform alkali leaching reaction for 4h . After the reaction is completed, it is transferred to a titanium rod filter while it is hot, and forced to filter to obtain an aluminosilicate solution.

[0066] (2) Transfer the aluminosilicate solution to a three-necked flask, install a condenser, connect a water circulation vacuum pump, and concentrate the aluminosilicate in a vacuum; the concentration temperature is 75°C, the vacuum degree is -0.08MPa, and the concentration end point is an alkali concentration of 220g / L (in Na 2 O meter).

[0067] (3) At an initial temperature of 80°C, add 64g of aluminum hydroxide seeds and 2.24g of crystallization aid sodium stearate to the concentrated aluminosilicate solution to promote the...

Embodiment 2

[0072] (1) Mix 345ml of 20% sodium hydroxide solution and 100g of spent FCC catalyst in a stainless steel autoclave, set the stirring speed at 1000rpm, heat up with electric heating, maintain the reaction temperature at 100°C and the pressure at 0.15MPa, and carry out alkaline leaching reaction for 5h . After the reaction is completed, it is transferred to a titanium rod filter while it is hot, and forced to filter to obtain an aluminosilicate solution.

[0073] (2) Transfer the aluminosilicate solution to a three-necked flask, install a condenser, connect a water circulation vacuum pump, and concentrate the aluminosilicate in a vacuum; the concentration temperature is 80°C, the vacuum degree is -0.08MPa, and the concentration end point is an alkali concentration of 240g / L (in Na 2 O meter).

[0074] (3) At an initial temperature of 90°C, throw 31.6g of aluminum hydroxide seeds and 1.58g of crystallization aid sodium stearate into the concentrated aluminosilicate solution to...

Embodiment 3

[0079] (1) Mix 760ml of 10% sodium hydroxide solution and 100g of spent FCC catalyst in a stainless steel autoclave, set the stirring speed at 600rpm, heat up with electric heating, maintain the reaction temperature at 135°C and the pressure at 0.35MPa, and perform alkali leaching reaction for 3h . After the reaction is completed, it is transferred to a titanium rod filter while it is hot, and forced to filter to obtain an aluminosilicate solution.

[0080] (2) Transfer the aluminosilicate solution to a three-necked flask, install a condenser, connect a water circulation vacuum pump, and concentrate the aluminosilicate in a vacuum; the concentration temperature is 70°C, the vacuum degree is -0.08MPa, and the concentration end point is an alkali concentration of 180g / L (in Na 2 O meter).

[0081] (3) At an initial temperature of 83°C, 93.5g of aluminum hydroxide seeds and 1.87g of crystallization aid sodium stearate were thrown into the concentrated aluminosilicate solution t...

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Abstract

The invention belongs to the technical field of flocculant production, and particularly relates to a method for preparing polyaluminum chloride and coproducing polysilicate ferric aluminum chloride byusing a waste catalyst. The method comprises the following steps: carrying out a heating and pressurizing reaction on a sodium hydroxide solution and an FCC waste catalyst, and performing filtrationafter the reaction is finished to obtain an aluminosilicate solution; carrying out vacuum concentration on the aluminosilicate solution; adding an aluminum hydroxide seed crystal and a crystallizationaid into the concentrated aluminosilicate solution at the initial temperature of 80-90 DEG C, lowering the temperature to 40-45 DEG C, and carrying out filter pressing to obtain solid aluminum hydroxide and a dealuminated mother solution; heating and pressurizing the obtained solid aluminum hydroxide and hydrochloric acid to prepare liquid polyaluminum chloride by a one-step process; and dropwiseadding a ferric trichloride solution and hydrochloric acid into the dealuminated mother liquor to adjust the pH value of the reaction system to 0.8-1.7, and curing the reaction system for 1-2 h to obtain liquid polysilicate ferric aluminum chloride. The method has the advantages of low cost, safety and environmental friendliness in use, avoiding of secondary pollution caused by leaching of heavymetal ions, and realization of the coproduction of the polysilicate ferric aluminum chloride from the remaining dealuminated mother liquor.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid hazardous waste and flocculant production, and in particular relates to a method for preparing polyaluminum chloride and co-producing polysilicon ferric aluminum chloride by using waste catalysts. Background technique [0002] Polyaluminum chloride is an inorganic polymer coagulant, referred to as polyaluminum, English abbreviation PAC, chemical formula is [Al 2 (OH) n Cl (6-n) .xH 2 O] m ; In the formula, m represents the degree of polymerization, m≤10; n represents the degree of neutrality of the product, n=1~5; Under the condition of a certain pH value, the polymeric aluminum ion with a certain degree of polymerization is formed through the bridging effect of hydroxyl and oxygen atoms. The molar ratio of the hydroxyl group to 3 times the aluminum ion) is measured. Polyaluminum ions in polyaluminium chloride are usually represented by Al 13 (OH) 7+32 、Al 10 (O...

Claims

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Application Information

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IPC IPC(8): C02F1/52C01F7/56
CPCC01F7/56C02F1/5236
Inventor 王文泽梁之举
Owner 山东聚杰环保科技有限公司
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