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Method for detecting content of soluble salt in slag aggregate of waste incinerator

A technology of waste incineration slag and detection method, which is applied in the field of detection of soluble salt content in waste incineration slag aggregates, can solve problems such as no test method for soluble salt content in aggregates, and achieve simple test equipment and sample The effect of small quantity and easy purchase

Inactive Publication Date: 2013-11-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current road industry standard "Test Regulations for Aggregate in Highway Engineering" (JTG E42) does not propose a test method for the content of soluble salt in aggregate.

Method used

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  • Method for detecting content of soluble salt in slag aggregate of waste incinerator

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: Sampling method for slag aggregates: multiple groups of slags uniformly distributed and roughly equal in quality are selected from the top, middle and bottom of the slag aggregate pile, and mixed uniformly to form a group of samples. Preparation of leachate from slag aggregates: Dry in an oven at 105°C for 8 hours, grind in a mortar, mix slag aggregates with different particle sizes and distilled water at a mass ratio of 1:5 and shake for 5 minutes to prepare multiple sets of suspensions, filter The obtained slag leachate was stored in a glass bottle with a stopper at room temperature and away from light.

[0017] Cl- content detection: take 100mL slag leaching solution respectively, and add 0.15mL 0.02mol / L sodium bicarbonate dropwise to it until the solution just turns yellow, add 0.25mL 50g / L potassium chromate indicator; add 0.04 mol / L silver nitrate, shake with the drops until the brick red precipitate no longer disappears; calculate the chloride content...

Embodiment 2

[0024] In order to further verify the effectiveness of the present invention, this embodiment tests slag leachate with different particle sizes, and the results are shown in Table 2. The smaller the particle size of the slag, the higher the concentration of chloride salt and sulfate, and the higher the electrical conductivity, indicating that the content of soluble salt in the fine particle size is higher. It can be seen that the detection method of the present invention can effectively distinguish the soluble salt content in slag with different particle sizes.

[0025] Table 2 Test results of various indicators of slag leachate with different particle sizes

[0026]

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Abstract

The invention relates to the field of resource utilization of waste incinerator slag, in particular to a method for detecting the content of soluble salt in slag aggregate of a waste incinerator. The method comprises the following steps: (1) sampling: selecting a plurality of groups of uniformly distributed furnace slag with substantially the same mass at the top, in the middle and at the bottom of the furnace slag aggregate pile and uniformly mixing the selected furnace slag into a group of furnace slag aggregate; (2) preparing furnace slag leachate; drying, pulverizing in a mortar, mixing and oscillating furnace slag and distilled water at the mass ratio of 1:5 for 5-6 minutes to prepare slurry, and filtering; (3) titrating silver nitrate solution to determine the concentration of chloride(Cl<-1->) in the furnace slag leachate; (4) titrating barium chloride solution to determine the concentration of sulfate radical (SO4<2->); (5) utilizing the electric conductivity tested by a conductometer to determine the total amount of soluble salt in the furnace slag leachate. The method provided by the invention can accurately test the content of soluble salt in the slag aggregate of a waste incinerator, is simple, feasible, quick and accurate, is short in the test period, and can achieve batch detection of furnace slag aggregate to provide reference for resource utilization of furnace slag aggregate.

Description

technical field [0001] The invention relates to the field of resource utilization of waste incineration slag, in particular to a detection method for soluble salt content in waste incineration slag aggregate. Background technique [0002] Waste incineration slag belongs to general solid waste, because its physical and mechanical properties are similar to natural stone, and it can be used as recycled aggregate for resource utilization of road engineering materials. However, there is a huge difference between slag aggregates and natural stones, which is mainly reflected in the fact that the solubility of slag aggregates is much greater than that of natural stones, which is mainly due to the water-soluble salt content in slag aggregates (specifically chlorine, sulfuric acid, etc. Roots, hydroxides, carbonates and bicarbonates, etc.) are high, and the test shows that the soluble salt content is 1-2%. Existing studies have shown that too high a soluble salt content, on the one h...

Claims

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Application Information

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IPC IPC(8): G01N1/04G01N1/28G01N5/04G01N21/77G01N27/06
Inventor 李立寒刘栋崔华杰
Owner TONGJI UNIV
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