Coal slurry water turbidity determination method

A measurement method and technology for coal slime water, which can be used in testing water, material inspection products, etc., can solve the problems of poor sedimentation performance, good sedimentation performance, and large fluctuation of coal slime water, and achieve wide practicability, good sedimentation performance, and true turbidity. small effect

Inactive Publication Date: 2007-11-28
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

3) Large fluctuations
High hardness, good slime water settling per

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1. The raw coal used for washing is anthracite, and the sludge rate is 15%. Controlling the amount of raw coal used for washing is the system design capability.

[0019] Start the sorting system, when the slime water completes a cycle, take a 500mL water sample from the feed inlet of the thickener, and use a hardness meter to determine the hardness of the circulating water to be 5 German degrees. At the same time, a 500mL water sample was taken from the overflow of the thickener, and the turbidity data of the water sample measured with a turbidimeter was 120NTU. Samples were also taken for 1, 2, 3, and 4 hours later, and the measured hardness value was constant at 5 German degrees, and the turbidity was 123NTU, 120NTU, 122NTU, and 120NTU, respectively. The obtained data indicates that the turbidity range corresponding to the slime water hardness is 5 German degrees is 120NTU-123NTU.

[0020] Add soluble calcium salt gypsum to the slime water circulation system, and ...

Example Embodiment

[0024] Example 2: Change the coal type of the raw coal to be washed to 1 / 3 coking coal, the sludge rate is 21%, and the hardness-turbidity relationship diagram needs to be re-calibrated.

[0025] The operation steps are exactly the same as in Example 1. When the slime water completes one cycle, the measured water hardness is constant at 8 German degrees, and the corresponding turbidity is 116NTU, 120NTU, 118NTU, 118NTU, so the corresponding turbidity range is 116NTU- 120NTU.

[0026] Also use gypsum to adjust the hardness of the circulating water to 18 German degrees, 28 German degrees, 38 German degrees, and 48 German degrees. Each time the hardness is adjusted, the hardness and its corresponding turbidity range are tested, and a total of 5 sets of data are obtained. Based on the above data, a hardness-turbidity relationship diagram is drawn.

[0027] When the system enters the normal operation stage, use the hardness meter to measure the hardness of the thickener on-line to be 1...

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Abstract

The invention relates to a measuring method for slime water turbidity suitable for cycling slime water in coal preparation plant especially. Based on the related relationship of turbidity and rigidity, by measuring rigidity of slime water real turbidity and sedimentation performance of cycling slime water can be reflected. Water hardness of in-material in concentration equipment of stable slime water system and corresponding flooding turbidity range are measured by hardness meter and turbidimeter respectively and rigidity-turbidity relation graph is drawn. In practice hardness meter is used to measure water hardness of in-material in concentration equipment on line and contrasts rigidity-turbidity relation graph to obtain real turbidity range of cycling water. The method can reflect turbidity of cycling water, sedimentation performance and change trend accurately. It conquers disadvantages of multiple interferences, big fluctuation and serious lag and so on possessed by adding drug control index in measuring turbidity index directly.

Description

technical field [0001] The invention relates to a method for measuring the turbidity of coal slime water, which is especially suitable for measuring the "true turbidity" of circulating coal slime water in a coal preparation plant. Background technique [0002] The settlement performance of the circulating coal slurry water in the coal preparation plant directly determines whether the coal preparation plant can produce continuously and stably. If the settling performance of the circulating coal slime water is poor, even if a large amount of flocculation agent is put in, the turbidity of the circulating water will continue to increase. In severe cases, the ash content of the clean coal will exceed the standard, the recovery rate will decrease, and the system will be paralyzed. Therefore, the coal preparation plant attaches great importance to the settling performance of the slime water. . [0003] At present, almost all coal preparation plants dire...

Claims

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Application Information

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IPC IPC(8): G01N33/18
Inventor 刘炯天王永田曹亦俊张明青冯莉
Owner CHINA UNIV OF MINING & TECH
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