A kind of low soluble salt cleaning pulp and its preparation method

Abstract

The invention provides low-solubility salt paper pulp and a preparation method thereof. The low-solubility salt paper pulp is characterized in that the paper pulp is harmless to vegetation; harmlessness is as follows: cultivated wheat seedling test is carried out on the basis of wet paper pulp free of pulp washing treatment and the harm of impurities in the paper pulp to wheat seedlings cannot be seen at least within a growth period from germination of wheat grains to over 5cm of seedlings; or the gram molar concentration of at least Na<+> or / and K<+> or / and Mg<2+> contained in the wet pulp is smaller than or equal to 0.034mol / L, namely the total concentration of at least soluble sodium salt, potassium salt and magnesium salt contained in a solution in the wet pulp is smaller than or equal to an upper limit value of intolerance 0.20% (wt%) of rice and wheat growth; or the wet paper pulp is only dried to absolute dryness of which the moisture content is not greater than 15%, and the weight of the Na<+> or / and K<+> or / and Mg<2+> contained in 1,000g of absolute dry paper pulp is smaller than or equal to 1.6g; the paper pulp is an offline chemical foaming production line; or the paper pulp is screened and classified paper pulp or unscreened or unclassified paper pulp of which the pulp degree value is within a range from 10 degrees SR and 90 degrees SR and the superimposed screening indicator is within a range from a 10mesh screen to a 200mesh screen hole.

Description

technical field [0001] The invention provides a clean pulp with low soluble salts and its preparation method. Specifically, the concentration of sodium ions or / and potassium ions or / and magnesium ions in the aqueous solution involved in the preparation process is strictly controlled to be less than or equal to 0.034mol / L, or the use of The joint production of organic fertilizer by-products such as waste liquid and waste residue in the pulping process belongs to the technical category of clean pulping or joint production with plant matter comprehensive utilization products, more specifically, it belongs to the chemical auxiliary foaming method or And the technical field of alkaline hydrogen peroxide mechanical pulping. [0002] technical background [0003] Clean pulping technology is a technical field that has been continuously innovating and improving in the pulp and paper industry in the past ten years. Alkaline hydrogen peroxide mechanical pulping (APMP pulping for short),...

AI Technical Summary

Problems solved by technology

[0010] In addition, according to ZL201010150534.4, the reduction of pH value in the preparation process is realized by adding sulfuric acid, which not only does not help to reduce the sodium ion content, but also because the pulp material is difficult to stir evenly in a short time, which is The general steel production line in the workshop will also bring the disadvantages of equipment corrosion and large adjustment deviation; and the application number 201310062868. medicine cold soaking) in step 2, which will also bring problems such as gradually increasing the dosage of the medicine to the subsequent bleaching operation

[0011] As mentioned above, the existing chemical-mechanical pulping technology represented by ZL201010150534.4 and application number 201310062868.X, etc., including the alkaline hydrogen peroxide mechanical method, so-called solves the drainage problem of the pulp itself , is actually an unsustainable hard plugging solution. Not only did it fail to propose a technical solution to completely solve the problem of high sodium ions in the pulp from the source, but the pulp prepared according to its description had a high concentration of sodium ions High, in terms of its adverse effects on the circulating water quality of the downstream papermaking process, it is also higher than the screened and washed pulp of the traditional method; in addition, ZL201010150534.4 and application number 201310062868. Flaws such as high dose consumption and large fluctuations

[0012] Another branch in the technical field of pulp preparation by clean method—explosive pulping. Although this method does not use chemicals, it is suitable for paper fiber blasting. It involves complex equipment such as pressure application, high temperature heating and instantaneous pressure withdrawal. Disadvantages of low output efficiency, etc.

[0013] In addition, the problems related to the joint production of pulping and plant matter comprehensive utilization products always involve the utilization of waste water or / and solid waste generated in the pulping process, which has not been seen in economics, environmental protection, technology Reliable and complete solutions are available on the market

Images