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Dehydration aid for caustic mud, and method for dehydrating caustic mud using the same

A technology of dehydration aid and causticizing mud, applied in chemical instruments and methods, dehydration/drying/thickened sludge treatment, water/sludge/sewage treatment, etc., can solve the problem of inability to achieve dehydration and lack of dehydration accelerator effect, the water content of the dehydrated filter cake does not decrease, etc.

Active Publication Date: 2016-08-31
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is the following problem in the technology of the aforementioned patent document 2: more air bubbles are mixed in the causticizing mud to hinder dehydration, so that the water content of the dewatered filter cake does not decrease, and the effect of adding a dehydration accelerator cannot be obtained; There are cases where stable dehydration cannot be achieved even if the above-mentioned dehydration accelerator is added due to changes in the dehydration process.

Method used

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  • Dehydration aid for caustic mud, and method for dehydrating caustic mud using the same
  • Dehydration aid for caustic mud, and method for dehydrating caustic mud using the same
  • Dehydration aid for caustic mud, and method for dehydrating caustic mud using the same

Examples

Experimental program
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Effect test

Embodiment 1-1

[0098] Collect 50mL of caustic mud slurry with a polyethylene bottle and heat it to the specified temperature (30°C). A predetermined amount (200 mg / L) of a dehydrating aid was added thereto, and mixed well to make it uniform. For the total amount of mixed mud, use a suction filter (maximum suction pressure: -0.095MPa) to filter for 60 seconds.

[0099] Take out the total amount of dehydrated filter cake after filtration, and dissolve it in a bag with a clamp to become uniform. Collect about 5g from it, and measure wet weight (W w ).

[0100] Afterwards, dry in a desiccator at 105° C. for more than 12 hours, and measure the dry weight (W d ). The water content in the dehydrated cake was obtained by the following formula.

[0101] Moisture content (mass %)=[(W in the dehydration filter cake w -W d ) / W w ]×100

[0102] The water content in the dehydrated cake is shown in Table 4.

Embodiment 1-2～1-4

[0104] In embodiment 1-2, 1-3 and 1-4, the caustic mud mud collected in the polyethylene bottle is heated to 50 ℃ (embodiment 1-2), 60 ℃ (embodiment 1-3) and The same operation as in Example 1-1 was performed except that the temperature was up to 80° C. (Example 1-4). The water content in the dehydrated cake is shown in Table 4.

Embodiment 2-1～14-4

[0106] In Examples 2-1 to 14-4, the same operations as in Example 1-1 were performed except that the type of dehydrating agent and the heating temperature were set as shown in Table 4. The water content in the dehydrated cake is shown in Table 4.

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Abstract

The present invention provides a caustic mud dewatering aid capable of efficiently dewatering mud containing calcium carbonate, comprising polyoxyethylene polyoxypropylene alkanes represented by the following general formula (1) Dehydration aid for caustic mud of base ether. R1O[CH2CH(CH3)O]m[CH2CH2O]nH...(1) (R1 in the formula represents a straight chain and / or branched chain alkyl group with 10 to 18 carbon atoms, m represents an integer of 1 to 10, and n represents an integer from 1 to 10).

Description

technical field [0001] The present invention relates to a dehydration aid for caustic mud, and a method for efficiently dehydrating mud (caustic mud) containing calcium carbonate using the dehydration aid. Background technique [0002] Conventionally, the causticization process in paper and / or pulp production, especially kraft pulp production, is as follows: black liquor recovered by cooking wood chips is burned in a boiler, the obtained smelt is dissolved, and the supernatant Quicklime is put into the green liquor, the sodium carbonate in the green liquor is converted into sodium hydroxide, and the generated calcium carbonate is removed to prepare the white liquor as the cooking liquor of wood chips. Green liquor is usually a strong alkaline aqueous solution with sodium carbonate and sodium sulfide as the main components; if quicklime is put into the green liquor, the quicklime will react with water to generate calcium hydroxide, which will exchange reaction with sodium car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C02F11/12D21C11/04C02F11/147
CPCD21C11/04C02F2103/28Y02P40/40C02F11/147
Inventor 山本英男贺川泰裕
Owner KURITA WATER INDUSTRIES LTD