A clear pulp production process for realizing complete comprehensive utilization and removing three wastes

Abstract

The invention aims to provide a clear pulp production process for realizing complete comprehensive utilization and removing three wastes. The method is characterized in that the traditional lagged production process for evaporating black liquor, reclaiming boiler burned alkali, causticizing white liquor, reclaiming lime and discharging the pollution in the pollution treatment of three-level biochemical treatment for middle waste water (three wastes of pulp comprise waste water, waste gas and waste sludge) is eliminated; the plant material is completely used to remove three-waste emission of the pulp and increase five by-products such as lignin biological glue and the like to achieve the good effect on pollution treatment with benefit for treating pollution and making money; and the rubbish-free and zero-emission clear pulp production is realized. Therefore, the pulp enterprise becomes a water-saving large enterprise from a water consuming large enterprise, becomes an environment-friendly large enterprise from a pollution discharging large enterprise, positively and actively treats the pollution from the passive treatment and becomes a comprehensive utilization model from a resource consuming large enterprise.

Description

technical field [0001] The invention relates to a comprehensive utilization of raw materials in the pulp and paper industry, in particular to a clean pulp production process for realizing 100% comprehensive utilization and eliminating three wastes. Background technique [0002] 1. No one in the world has made 100% comprehensive utilization of pulp and paper raw materials: [0003] At present, the serious problem in the pulp and paper industry in the world is the great waste of plant raw materials, because pulp and paper only use cellulose in plant raw materials, and cellulose only accounts for 40% to 54% of plant raw materials, and the rest is lignin 20% to 30%, hemicellulose 10% to 25%, and ash 0.15% to 6%. Most of the components except cellulose are discarded in the pulping process and are discarded into the pulping wastewater In the alkali recovery process, it is sent to the boiler for incineration, that is to say, the pulp and paper industry only uses half of the plant ...

AI Technical Summary

Problems solved by technology

[0009] 4. The above-mentioned three major drawbacks in the pulp and paper industry: waste of plant resources, three pollution discharges, and high water consumption are well-known, and experts and scholars in the industry have been actively researching them for more than 100 years and development, are eagerly trying to find ways to eradicate the pollution of pulp production, and have indeed achieved many practical effects, so that the COD in the wastewater discharge of pulp production cr 、BOD 5 The indicators keep falling and meet the emission standards stipulated by various countries. However, since the traditional pulp production process cannot be fundamentally changed, pollution control needs to increase production costs, so the environmental protection work of the pulp industry has been in a reluctant "passive pollution control" situation. , although great progress has been made, it is difficult to completely eliminate the three major pollution discharges

Images