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Method for treating fly ash by water washing

A fly ash and filtered technology, which is applied in cement production and other directions, can solve problems such as high chlorine content in cement, inability to use reinforced concrete, corrosion, etc., and achieve the effect of harmless disposal and reduced impact

Active Publication Date: 2013-02-20
BEIJING BBMG BEISHUI ENVIROMENTAL TECH CO LTD
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Problems solved by technology

However, the high content of chloride in waste incineration fly ash will have adverse effects such as high-temperature chlorine corrosion on the cement rotary kiln, and the cement produced by using untreated waste incineration fly ash has a high chlorine content and cannot be used for reinforced concrete.

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  • Method for treating fly ash by water washing

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with drawings and embodiments.

[0035] A method for disposing of fly ash by water washing described in this embodiment, the process flow is as shown in the accompanying drawings, including the following steps:

[0036] 1. Washing stage

[0037] (1) Add the fly ash in the warehouse into the mixing tank through the feeding scale, and at the same time, add water and fly ash into the mixing tank according to the ratio of 1:2 to 6 to fully stir and mix; in this embodiment, water and fly ash The ash is added into the mixing tank according to the ratio of 1:4 and fully stirred and mixed.

[0038] (2) Filter the mixture of fly ash and water that has been stirred and mixed through a belt vacuum filter to separate the solid from the liquid;

[0039] (3) The filtered fly ash solid can be put into the cement rotary kiln for incineration through the pre-treatment system, and the filtered liquid enters the acid-b...

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Abstract

The invention relates to a method for treating fly ash by water washing. The technical process of the method is as follows: weighing fly ash, and adding into a stirring tank; simultaneously adding water according to a water-to-fly ash ratio of 1:(2-6), stirring, and mixing; then, carrying out solid-liquid separation in a belt vacuum filter; putting the fly ash solid into a cement rotary kiln, and incinerating; adding sulfuric acid into the liquid to regulate the pH value to 6-8, and then adding a reagent, so that heavy metals in the solution settle out; then carrying out solid-liquid separation in the belt vacuum filter, landfilling the salts filtered out, introducing the liquid into a multi-effect evaporator, and evaporating; and carrying out washing liquid concentration to obtain a saturated solution, using the belt vacuum filter to filter out the salts, returning the liquid to the multi-effect evaporator to perform secondary evaporation, and repeating the cycle. By washing with water to transfer most of harmful elements in the fly ash into the water solution, the invention reduces the influence of the fly ash on the kiln system; and by combining the water washing mode and the cement kiln, the invention achieves the harmless treatment of the fly ash.

Description

technical field [0001] The invention relates to a method for disposing of fly ash, in particular to a method for disposing of fly ash by washing with water. Background technique [0002] Utilizing cement kilns has great advantages in fly ash disposal projects. It is an effective method to eliminate dioxins and solidify heavy metals in waste incineration fly ash by incinerating fly ash produced by waste incineration at high temperature in a cement rotary kiln to produce cement. Due to the high temperature of the rotary kiln above 1450°C, the strong turbulence of high-temperature gas in the kiln, and the characteristics of alkaline atmosphere, it can effectively decompose dioxins and solidify most of the heavy metals in hazardous wastes in clinker to generate stable salts. minerals, avoiding its re-pollution to the environment. [0003] Since the composition of waste incineration fly ash is similar to that of some raw materials in cement, using waste incineration fly ash to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 王义春熊运贵张觊蔡金山
Owner BEIJING BBMG BEISHUI ENVIROMENTAL TECH CO LTD
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