Method for preparing acidic soil conditioner with papermaking black liquor and its application

Abstract

The invention provides a method for preparing an acid soil conditioner with papermaking black liquid and application thereof. The method is characterized by comprising the following steps: S1, adding a clay material in the papermaking black liquid, heating after stirring, and carrying out solid-liquid separation of a mixture after heating; S2, adding CaCl2 into liquid obtained through separation in S1, obtaining a liquid mixture after stirring, moving the liquid mixture to an evaporator, and carrying high-temperature evaporation on water occupying 70% to 80% of total volume; S3, mixing a solid obtained through separation in S1 and the liquid mixture in S2, and carrying out low-temperature evaporation of water; and S4, smashing and sieving a mixture obtained after the low-temperature evaporation in S3 to obtain the product. The invention further provides the acid soil conditioner prepared through the method and application of the acid soil conditioner. The acid soil conditioner prepared in the invention is wide in raw material resource, the soil PH value can be improved, the effect of adsorbing heavy metal of passivated metal is good, the soil structure can also be improved, various nutritive elements required for plants are supplemented, the plant growth is promoted, and the acid soil conditioner is an environmentally-friendly soil conditioner.

Description

technical field [0001] The invention relates to the technical field of agricultural environment conservation and restoration, in particular to a method for preparing an acidic soil conditioner from papermaking black liquor and its application. Background technique [0002] Soil acidification is a manifestation of soil degradation. Soil acidification is not only an important reason for the decline of soil fertility, but also an important factor restricting the sustainable development of agricultural production. According to statistics, from the 1980s to the present, my country's soil acidification has become more and more serious, and the acidified land area has expanded to more than 40% of my country's cultivated land area, and often occurs in large areas, especially in southern my country. The soil itself is slightly acidic, and there is more rainfall, which makes the soil acidification more serious. [0003] Soil acidification can cause the activation of heavy metals such ...

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Problems solved by technology

[0008] In order to solve the problems existing in the prior art, the invention provides a kind of method that prepares acidic soil conditioner with papermaking black liquor, this method utilizes the property that papermaking black liquor is alkaline, and forms alkaline heat condition by heating, to The clay material is modified, and the ion exchange capacity of the modified clay material and lignin and other macromolecular organic substances in the papermaking black liquor increases, which is conducive to the adsorption of soil heavy metals and reduces the bioavailability of heavy metals; The method has low equipment requirements, simple production, low cost, and no pollutant discharge, and can treat a large amount of papermaking black liquor, which solves the technical problems of complex processing technology, high equipment requirements and high cost in the prior art for processing papermaking black liquor, and is beneficial to the environment. the construction

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