Method for recovering solids in paper-making coating waste water

A paint wastewater and recovery method technology, applied in papermaking, textiles and papermaking, chemical instruments and methods, etc., can solve problems such as inconvenient operation and cleaning, difficult transportation, easy clogging, etc., to improve grinding efficiency, improve dispersibility, The effect of saving investment

Active Publication Date: 2017-05-31
HAINAN JINHAI PULP & PAPER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its main disadvantages are: due to the addition of flocculant in the second step, the viscosity of the calcium carbonate solution is high and the calcium carbonate will continue to settle before the final step, so it will be difficult to transport before adding the dispersant, it is easy to block, and the operation is difficult. and cleaning is inconvenient

Method used

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  • Method for recovering solids in paper-making coating waste water
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  • Method for recovering solids in paper-making coating waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to Embodiment 3

[0041] In the process of step S3, the solid content that settles down is collected and sent to the intermediate barrel tank that is provided with agitator again, the solid content of the solid content that settles down among the example 1 to embodiment 3 is respectively 21.9%, 28.8% and 34.01% , the stirring speed is 2000r / min, and NaOH, dispersant and ground calcium carbonate solution are sequentially added to the middle tank. After adding NaOH, the pH=8, the added amount of the dispersant is 400PPM, and the solid content of the newly added ground calcium carbonate solution is 75%.

[0042] The viscosity improvement result of embodiment 1 to embodiment 3 is as shown in table 2, and viscosity (unit is cPS) variation curve is as shown in figure 2 shown.

[0043] Table 2

[0044]

Embodiment 4 to Embodiment 6

[0046] In the process of step S3, the solid matter that settles down collects and sends into the intermediate vat that is provided with agitator again, the solid content of the solid matter that settles down among the example 4 to embodiment 6 is respectively 21.9%, 28.8% and 34.01% , the stirring speed is 3000r / min, and NaOH, dispersant and ground calcium carbonate solution are sequentially added to the middle tank. After adding NaOH, the pH=9.2, the added amount of the dispersant is 360PPM, and the solid content of the newly added ground calcium carbonate solution is 55%.

[0047] The improvement results of the viscosity (in cPS) of Examples 4 to 6 are shown in Table 3.

[0048] table 3

[0049]

[0050]

Embodiment 7 to Embodiment 9

[0052] In the process of step S3, the solid content that settles down is collected and then sent into the intermediate tank that is provided with agitator, and the solid content of the solid content that settles down among the example 7 to embodiment 9 is respectively 21.9%, 28.8% and 34.01% , the stirring speed is 5000r / min, and NaOH, dispersant and ground calcium carbonate solution are sequentially added to the middle tank. After adding NaOH, the pH=10, the added amount of the dispersant is 480PPM, and the solid content of the newly added ground calcium carbonate solution is 99%.

[0053] The improvement results of the viscosity (in cPS) of Examples 7 to 9 are shown in Table 4.

[0054] Table 4

[0055]

[0056]

[0057] From Tables 2 to 4 and figure 2 It can be seen that the present invention increases the treatment of the middle tank of step S3 before step S4 grinding, adjusts the addition ratio of NaOH and dispersant, reduces the viscosity, and realizes reducing ...

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Abstract

The invention provides a method for recovering solids in paper-making coating waste water. The method comprises the following steps: S1, removing the impurities in the coating waste water by using a screening machine, and sending the waste water without impurities into a sedimentation tank; S2, adding a flocculant into the coating waste water so as to enable the solids in the coating waste water to settle down to the bottom of the sedimentation tank; S3, collecting the settled solids, sending the collected solids into an intermediate barrel tank which is internally provided with a stirrer, and sequentially adding NaOH, a dispersing agent and a ground calcium carbonate solution into the intermediate barrel tank to obtain a total calcium carbonate solution, wherein the solid content of the ground calcium carbonate solution is higher than that of the settled solids; S4, grinding the total calcium carbonate solution, and recovering the ground total calcium carbonate solution. The method is used for effectively reducing the viscosity of a coating solution and increasing the dispersity and the grinding efficiency, and the solid content of the recovered coating solution reaches the high concentration suitable for a paper-making technology, so that the problem that a pipeline is easily blocked is solved, the investment for equipment is saved, and the process cost is greatly lowered.

Description

technical field [0001] The invention belongs to the technical field of papermaking wastewater recovery, and in particular relates to a solid content recovery method of papermaking paint wastewater. Background technique [0002] Coated paper is a kind of high-grade printing paper, which is coated with a layer of paint on the base paper, so that the paper has good optical properties and printing performance. The production process of coated paper includes a paint preparation system for the production of paint, and every time a paint is prepared and a batch of paint is used up on the paper machine, the paint preparation system must be cleaned, thus generating a large amount of cleaning waste. The wastewater produced by cleaning paint pipes and channels in the paper industry often contains a certain amount of solid content, and its main component is calcium carbonate. Therefore, recycling the solid content of wastewater and putting it into use is an environmentally friendly and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/00D21H17/01D21H17/67C02F1/52C02F1/56C02F103/28
CPCC02F1/5245C02F1/56C02F2103/28D21C11/00D21H17/01D21H17/675
Inventor 刘晓龙陈琦王金耀
Owner HAINAN JINHAI PULP & PAPER
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