Coal mud water clarifying and controlling method based on water quality adjustment

Abstract

The invention relates to a coal slurry clarification and control method based on water quality regulation, which is suitable for the treatment of the circulating coal slurry of a coal preparation plant. Firstly, the feeding concentration and water hardness are measured to determine the nature of and classify the coal slurry according the water hardness value and a water quality regulating agent is added according to the water hardness to regulate the water hardness; the water quality hardness value is real time monitored to control the adding quantity of the water quality regulating agent to regulate the water quality of the coal slurry to a total hardness of larger than 50 German degrees, thus changing the hard settled coal slurry into an easy settled coal slurry firstly. The hardness and the concentration of the overflow water of a thickener are measured, and if the total hardness of the coal slurry is less than 50 German degrees, the water quality regulating agent should be continuously added until the total hardness of the coal slurry is larger than 50 German degree; the concentration value of the overflow water is also referred to, if the concentration value is more than 1g / l, the flocculant is further added until the concentration value is less than 1g / l. The method of the invention can prepare coal with fresh water, thus enhancing the utilization rate of water, preventing the outflow of the coal slurry and the environmental pollution of the mining area reducing the running off and the waste of coal resources and having small loss of coal. The total expenses of the invention is lowered by 20 to 80 percent than the prior art, with simple and easy operated method.

Description

technical field [0001] The invention relates to a coal slime water clarification control method based on water quality adjustment, and is especially suitable for the treatment of circulating coal slime water in a coal preparation plant. Background technique [0002] Coal slime water settlement is the most critical, complex and costly link in the entire coal preparation production system. At present, each coal preparation plant mainly adopts: [0003] 1. Chemical treatment: polymer flocculants (such as polyacrylamide, etc.), or coagulants (such as polyaluminum chloride, etc.), or two mixed methods are generally used to treat slime water. Although the settlement of slime water can be realized in theory, from a technical perspective, this chemical flocculation (coagulation) method can only catch coarse particles and make the coarse slime settle, while the fine slime still circulates in the system, forming High-concentration circulating slime water syst...

AI Technical Summary

Problems solved by technology

Although the settlement of slime water can be realized in theory, from a technical perspective, this chemical flocculation (coagulation) method can only catch coarse particles and make the coarse slime settle, while the fine slime still circulates in the system, forming High-concentration circulating slime water system; From an economic perspective, due to the high cost of chemicals, it leads to a deficit of dosing, forming a low-concentration slime water cycle in the actual production process

[0004] 2. Detection method: The concentration of the overflow water of the concentrator is used as the main reference index to determine the addition of relevant chemicals. This method is lagging behind in detection, and the consumption of chemicals is relatively large and the cost is high.

The fluctuation of this slime water system poses a serious threat to normal production

[0007] 2. Difficult to detect and control

Due to the large fluctuations in the concentration of the slime water circulation system and circulating water, it is difficult to find an index that reflects the state of the slime water in real time; it is difficult to establish a quantitative relationship between the detection amount and the control amount