WO2018148869A1

WO2018148869A1 - Leaching solution for waste incineration fly ash chelate and preparation and application methods therefor

Info

Publication number: WO2018148869A1
Application number: PCT/CN2017/073538
Authority: WO
Inventors: 刘红; 赵晓峰; 谭巍; 叶宇洋
Original assignee: 深圳市能源环保有限公司
Priority date: 2017-02-14
Filing date: 2017-02-14
Publication date: 2018-08-23

Abstract

Disclosed are a leaching solution for a waste incineration fly ash chelate and preparation and application methods therefor. The leaching solution is composed of components such as sulfuric acid, glacial acetic acid, boric acid and deionized water. The preparation method therefor comprises the following steps: step one, 0.2-1.2 mg of boric acid is weighed and diluted and dissolved with 200 ml of deionized water for later use; step two, 0.5-1.5 ml of glacial acetic acid with a concentration of 99.5% is transferred and then diluted with 200 ml of deionized water for later use; step three, 1580-1590 ml of deionized water is measured with a measuring cylinder and poured into a beaker, and then, 10-20 ml of concentrated sulfuric acid with a concentration of 98% is measured with a measuring cylinder, the concentrated sulfuric acid is injected into the beaker and stirred continuously with a glass rod and cooled for later use; and step four, the solutions formulated in steps 2 and 3 are slowly added into a beaker of step 1 and stirred until uniform, wherein after cooling, the solution is transferred into a volumetric flask for later use. At the same time, also provided is a method for leaching the toxicity of a fly ash chelate by using the above leaching solution, which method can improve the efficiency of detecting large quantities of samples every day and provide a pre-treatment method for online monitoring technologies, thus making online monitoring possible.

Description

Waste incineration fly ash chelate extract liquid and preparation application method thereof

Technical field

The invention relates to a waste incineration plant solid waste extracting agent, in particular to a garbage incineration fly ash chelate extracting liquid and a preparation method thereof.

Background technique

Existing waste incineration plants generally use inorganic or organic agents to stabilize fly ash. The treated fly ash chelates need to be tested for leaching toxicity of multiple samples every day, reaching the “Standard for Pollution Control of Domestic Waste Landfill” (GB16889) -2008) Requirement can be sent to the landfill of the domestic waste landfill. GB16889-2008 stipulates that the leaching toxicity of fly ash chelate should be pretreated by acetic acid buffer solution (HJ/T 300-2007), but the pretreatment method takes 18-20 hours for a single sample. The processing time is long and therefore there is no online monitoring condition.

Summary of the invention

In order to solve the problems existing in the prior art, the present invention provides a fast and accurate pretreatment method, which improves the detection efficiency of large-scale samples per day, and provides a pre-processing method for online monitoring technology, thereby making online monitoring possible.

The technical solution adopted by the present invention is a garbage incineration fly ash chelate extract, which is characterized in that it is composed of sulfuric acid, glacial acetic acid, boric acid and deionized water, and is calculated by a molar ratio of sulfuric acid. The molar ratio of glacial acetic acid and boric acid to deionized water is:

Sulfuric acid: deionized water = 0.138:1

Glacial acetic acid: deionized water = 0.113:1

Boric acid: deionized = 0.012:1

The technical solution adopted by the present invention for solving the problem is a method for preparing a waste incineration fly ash chelate extract, which comprises the following steps:

In the first step, 0.2-1.2 mg of boric acid is weighed, and then diluted and dissolved in 200 ml of deionized water for use.

In the second step, 0.5-1.5 ml of glacial acetic acid (99.5% concentration) was removed, and then diluted with 200 ml of deionized water for use.

In the third step, the measuring cylinder is taken with 1580-1590ml of deionized water, poured into a beaker, and then the measuring cylinder is used to measure 10-20ml of concentrated sulfuric acid (concentration 98%), the concentrated sulfuric acid is injected into the beaker, and the glass rod is continuously stirred and cooled. use;

In the fourth step, the solutions prepared in steps 2 and 3 are slowly added to the beaker of step 1 and stirred, cooled, and transferred to a volumetric flask for use.

A fly ash chelate toxic extraction method, characterized in that the method comprises the following steps:

In the first step, the sample to be inspected is manually crushed and passed through a 9.5 mm sieve (Teflon-coated sieve), and 0.5-1 g of the sieve is taken to a rapid moisture detector for determination to determine the water content.

In the second step, 100g sample is taken into a polytetrafluoroethylene (PTFE) beaker, and the solid phase and liquid phase content in the sample are calculated according to the moisture content of the sample measured in step 1, and then the solid weight unit is kg, and the liquid volume unit is L, the above extract is calculated according to the ratio of solid to liquid ratio of 1:20 The volume, the extract is taken and the extract is added to the beaker and stirred rapidly for 5 minutes by hand;

In the third step, the beaker of step 2 is placed on a constant temperature magnetic stirrer, the temperature is set to 40 to 70 ° C, the rotation speed is 50 to 130 r / min, and the stirring time is 1 to 2 h.

In the fourth step, the extract was obtained by filtration through a 0.45 μm membrane.

The invention has the beneficial effects that the fly ash chelate is pretreated by a rapid leaching agent and a special leaching method, and the reaction time is shortened effectively, and the pretreatment time is shortened from the original 18-20 h to 1-2 h, and the leaching effect is obtained. It is the same as the acetic acid buffer solution method (HJ/T 300-2007), and is especially suitable for the detection of large quantities of fly ash chelate, which creates conditions for online monitoring of leaching toxicity of fly ash chelate.

detailed description

Example 1

A method for preparing a waste incineration fly ash chelate extract, characterized in that the method comprises the following steps:

In the first step, 0.2 mg of boric acid was weighed and then diluted with 200 ml of deionized water to be used.

In the second step, 0.5 ml of glacial acetic acid (99.5% concentration) was removed, and then diluted with 200 ml of deionized water for use.

In the third step, the measuring cylinder is taken with 1580 ml of deionized water, poured into a beaker, and then 10 ml of concentrated sulfuric acid (concentration 98%) is taken in a measuring cylinder, concentrated sulfuric acid is poured into the beaker, and continuously stirred with a glass rod, and cooled for use;

Example 2

In the first step, 0.8 mg of boric acid was weighed and then diluted and dissolved in 200 ml of deionized water for use.

In the second step, 1.0 ml of glacial acetic acid (99.5% concentration) was removed, and then diluted with 200 ml of deionized water for use.

In the third step, the measuring cylinder is taken with 1585 ml of deionized water, poured into a beaker, and then 15 ml of concentrated sulfuric acid (concentration 98%) is taken in a measuring cylinder, concentrated sulfuric acid is poured into the beaker, and continuously stirred with a glass rod, and cooled for use;

Example 3

In the first step, 1.2 mg of boric acid was weighed and then diluted and dissolved in 200 ml of deionized water for use.

In the second step, 1.5 ml of glacial acetic acid (99.5% concentration) was removed, and then diluted with 200 ml of deionized water for use.

In the third step, the measuring cylinder is taken with 1590 ml of deionized water, poured into a beaker, and then 20 ml of concentrated sulfuric acid (concentration 98%) is taken in a measuring cylinder, concentrated sulfuric acid is poured into the beaker, and continuously stirred with a glass rod, and cooled for use;

Example 4

In the second step, 100g sample is taken into a polytetrafluoroethylene (PTFE) beaker, and the solid phase and liquid phase content in the sample are calculated according to the moisture content of the sample measured in step 1, and then the solid weight unit is kg, and the liquid volume unit is L, according to the ratio of solid to liquid ratio of 1:20 to calculate the volume of the above extract, the amount of extract and extract the extract into the beaker, artificial rapid stirring for 5min;

Claims

A waste incineration fly ash chelate extract characterized by being composed of sulfuric acid, glacial acetic acid, boric acid and deionized water, and calculated by molar ratio, wherein sulfuric acid, glacial acetic acid, boric acid and deionized water respectively The molar ratio is:

Sulfuric acid: deionized water = 0.138:1

Glacial acetic acid: deionized water = 0.113:1

Boric acid: deionized = 0.012:1
A method for preparing a waste incineration fly ash chelate extract, characterized in that the method comprises the following steps:

In the first step, weigh 0.2-1.2mg of boric acid, then dilute it with 200ml of deionized water, and set aside;

In the second step, the concentration of 99.5% glacial acetic acid 0.5-1.5ml is removed, and then diluted with 200ml of deionized water for use;

In the third step, the measuring cylinder is taken with 1580-1590 ml of deionized water, poured into a beaker, and then the measuring cylinder is used to measure the concentration of 98% concentrated sulfuric acid 10-20 ml, and the concentrated sulfuric acid is poured into the beaker, and continuously stirred with a glass rod, and cooled for use;

In the fourth step, the solutions prepared in steps 2 and 3 are slowly added to the beaker of step 1 and stirred, cooled, and transferred to a volumetric flask for use.
A method for toxic leaching of fly ash chelates by using the extract of claim 1 , comprising the steps of:

In the first step, the sample to be inspected is manually crushed and passed through a sieve of 9.5 mm, and 0.5-1 g of the sieved material is taken to a rapid moisture detector for detection to determine the moisture content thereof;

In the second step, 100g sample is taken into the polytetrafluoroethylene beaker, and the solid phase and liquid phase content in the sample are calculated according to the moisture content of the sample measured in step 1, and then the solid weight unit is kg, and the liquid volume unit is L, according to Calculating the volume of the extract according to claim 1 by the ratio of solid to liquid ratio of 1:20, measuring the extract and adding the extract to the beaker, and manually stirring for 5 min;

In the third step, the beaker of step 2 is placed on a constant temperature magnetic stirrer, the set temperature is 40-70 ° C, the rotational speed is 50-130 r / min, and the stirring time is 1 ~ 2 h;

In the fourth step, the extract was obtained by filtration through a 0.45 μm membrane.