Process for recycling filter residues of polyaluminium chloride series coagulants

A technology of polyaluminum chloride and coagulant is applied in the field of resource reuse technology of filter residues, which can solve the problem that the filter residues cannot be put into production so as to meet the standards and the like.

Inactive Publication Date: 2013-08-28
嘉善海峡净水灵化工有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the existing technology cannot put the filter residue into production to prepare standard polyaluminum chloride products, and explore a kind of resource utilization technology of polyaluminum chloride series coagulant filter residue, without increasing equipment In the case of other raw materials, the f

Method used

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  • Process for recycling filter residues of polyaluminium chloride series coagulants

Examples

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Embodiment 1

[0035] Embodiment 1, get converted into mass concentration and be 120kg of industrially synthesized hydrochloric acid of 100%, add reaction tank, add aluminum hydroxide 70kg under constant stirring, steam heating, make reaction tank temperature be controlled between 80-110 ℃, reaction 2 hours, then cool to 50-70°C, add 30kg of filter residue and 125kg of calcium aluminate powder under constant stirring, and gradually add 655kg of water, control the flow rate when adding water, so that the solution temperature is controlled within the range of 80-100°C, at this time the total water The amount of water converted from the amount of steam should be deducted, and the liquid residue should be separated after 2 hours of reaction. In this example, pressure filtration is used to obtain 950 kg of polyaluminum chloride for drinking water and 50 kg of filter residue. The finished product meets the national standard of GB 15892-2009, and The obtained filter residue is recycled into the prod...

Embodiment 2

[0036] Example 2, take 160 kg of industrially synthesized hydrochloric acid converted into a mass concentration of 100%, add it to the reaction tank, add 120 kg of aluminum hydroxide under constant stirring, control the temperature of the reaction tank between 80-110 ° C, react for 5 hours, and then cool to 50-70°C, add 50kg of filter residue and 60kg of calcium aluminate powder under continuous stirring, and gradually add 610kg of water. When adding water, control the flow rate so that the solution temperature is controlled within the range of 80-100°C. At this time, the amount of steam should be deducted from the total amount of water. After 3 hours of reaction, carry out liquid slag separation. This example adopts centrifugation to obtain 940kg of polyaluminum chloride for drinking water and 60kg of filter residue. The obtained filter residue is recycled into the production system again.

Embodiment 3

[0037]Example 3, get 135kg of industrial hydrochloric acid converted into a mass concentration of 100%, add to the reaction tank, add 100kg of aluminum hydroxide under constant stirring, control the temperature of the reaction tank between 80-110°C, react for 3 hours, then cool to 50 -70°C, add 40kg of filter residue and 85kg of calcium aluminate powder under continuous stirring, and gradually add 640kg of water. When adding water, control the flow rate so that the solution temperature is controlled within the range of 80-100°C. At this time, the amount of steam should be deducted from the total amount of water to convert After 2.5 hours of reaction, liquid slag separation was carried out. This example adopts pressure filtration to obtain 955kg of industrial polyaluminum chloride as filtrate product, and 45kg of filter residue. The filter residue is recycled into the production system again.

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Abstract

The invention provides a process for recycling filter residues of polyaluminium chloride series coagulants. Under the condition of not adding any reaction equipment or raw materials, the filter residues are directly reused in the production process of polyaluminium chloride series products. The process comprises the steps of adding industrial hydrochloric acid or industrial synthetic hydrochloric acid to a reaction vessel, adding aluminium hydroxide under the condition of constant stirring, carrying out steam heating, controlling the reaction temperature to be 80-110 DEG C and reaction time to be 2-5 hours and cooling a reaction solution to 50-70 DEG C, adding the filter residues and calcium aluminate powder under the condition of constant stirring, adding water and controlling the flow when water is added to control the solution temperature between 80 DEG C and 100 DEG C, carrying out solution-residue separation after reaction for 2-3 hours, subpackaging and warehousing the finished product of solution and returning the filter residues to a production system to continue participating in reaction, wherein the water quantity converted from steam quantity needs to be deducted from the total water quantity when the solution temperature is controlled between 80 DEG C and 100 DEG C. The technical process is simple, is high in recycle rate of active ingredients of the filter residues and can reduce the production cost and the environmental protection pressure.

Description

technical field [0001] The invention belongs to the treatment of water, waste water, sewage or sludge. In particular, it relates to a resource recycling process of filter residue produced in the production process of water treatment agent. Background technique [0002] Coagulation is the core process of water treatment. Since the polyaluminum chloride water treatment agent with good performance was available in the 1960s, polyaluminum chloride has become the mainstream coagulant in the water treatment process, and subsequently derived A series of poly aluminum chloride series products. This series of coagulants mainly use bauxite or aluminum hydroxide, calcium aluminate powder, industrial hydrochloric acid or industrial synthetic hydrochloric acid as the main raw materials. However, regardless of whether calcium aluminate powder or bauxite is used as the main raw material, a considerable amount of filter residue will be produced during the reaction process, which brings en...

Claims

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Application Information

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IPC IPC(8): C02F1/52C01F7/60
Inventor 沈烈翔徐鑫英沈萍解望斐沈敬贤
Owner 嘉善海峡净水灵化工有限公司
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