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Alkali recovery process for cotton linter soda pulping black liquor

A technology of caustic soda pulping and cotton linters, which is applied in the combustion of pulping waste liquid and other directions, can solve the problems of failing to meet emission standards, complicated procedures, and excessive discharge, and achieves good effects, simple process, and avoidance of re-pollution. Effect

Inactive Publication Date: 2008-06-25
XINXIANG RUNYANG CHEM FIBER
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  • Abstract
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Problems solved by technology

The disadvantage of this treatment method is that the process is complicated, the cost is high, and the discharge standard is often not met, resulting in excessive discharge.

Method used

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  • Alkali recovery process for cotton linter soda pulping black liquor

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Embodiment Construction

[0007] The embodiment is described in detail in conjunction with the above process flow chart.

[0008] In the present invention, in the existing alkali recovery process of cotton linter caustic soda pulping, due to the low content of organic matter in the black liquor, it cannot be stably burned in the alkali recovery furnace. Alkali recovery process of conveying cotton pulp black liquor to the furnace. The specific process method is: firstly, the cotton pulp black liquor that has been evaporated and concentrated to a concentration of 40-60% is pressurized to 2.0mpa with a pump, and is atomized and sent into the Combustion in the combustion furnace; during the black liquor combustion, fuel is added to the furnace with auxiliary burners, such as fuel guns and heaters. The fuel can be heavy oil, oxygen or liquefied petroleum gas, etc. Keep the temperature at the bottom of the furnace above 900°C to degrade the organic matter in the black liquor into H at high temperature 2 O ...

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Abstract

The invention discloses a cotton linter caustic soda method pulping black liquor alkali recovery technique; firstly cotton pulp black liquor with the concentration of 40 to 60 percent is pressurized to 2.0 mpa by a pump and heated to 100 to 120 DEG C, then the cotton pulp black liquor is atomized by a black liquor gun and sent to a burner for combustion; when the black liquor is burned, fuel is added to the burner for combustion by an auxiliary burner in order that the temperature of the bottom of the hearth can keep above 900 DEG C; organic matter in the black liquor is burned to create H2O and CO2; inorganic matter is recovered to a dissolving tank to dissolve into green liquor which is then sent to a causticization plant to create alkali for recycling use. One part of heat energy for the condensation of the cotton pulp black liquor is taken from the heat energy of steam produced by the combustion in the technique. The invention has the advantages that the invention has simple technique and good effect on processing the cotton linter black liquor, makes full use of waste, avoids the recontamination on environment drastically and has low comprehensive cost.

Description

Technical field: [0001] The invention relates to a process method for recovering and recycling alkali from cotton linter caustic soda pulping black liquor. Background technique: [0002] At present, the alkali recovery technology of papermaking black liquor has been widely used. The process steps are to first evaporate, burn, dissolve and convert the pulping black liquor into green liquor, and then use excess lime to causticize to obtain caustic soda white liquor. Extract caustic soda or send the white liquor to the causticizing process for recycling. The processing of the current cotton linter caustic soda pulping black liquor cannot apply the above-mentioned processing method because of its low organic matter content. The current treatment method of cotton linter caustic soda pulping black liquor is generally to carry out biochemical treatment first, that is, to degrade with microorganisms under aerobic conditions, and the pollutants in the water are transformed into inor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/12
Inventor 李云生张家银张琮罗智红郑永建
Owner XINXIANG RUNYANG CHEM FIBER
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