DE1542905C3 - - Google Patents

Description

Nical phosphoric acid (60 ". oig) was after the components in each case previously with water in the ratio 1: 50 were diluted, a silica sol was prepared in a mixer. The amount of phosphoric acid was dimensioned so that the silica sol had a pH of about 8. The thus obtained clear, stable sol was added to the soil by raining.

Another stable silica sol was then prepared in the same way, but the pH was adjusted to about 4 by using a larger amount of phosphoric acid. The acidic silica sol obtained in this way was added to the soil in approximately the same amount by rain. The total amount of silica introduced into the sheet in both operations, calculated as the solids content, was about 100 to 150 g / m ² .

The stability of the silica sols is increased if one uses the alkali silicate solution described above adds about 1 to 2 percent by weight of urea.

ίο A careful examination of the treated soil resulted in a surprisingly high structural improvement.

Claims (4)

1 2 Patent Claims- Preferably those silica sols are used that are obtained by adding phosphoric acid 1. Method for soil improvement, since alkali silicate solutions to the desired pH value characterized by the fact that one is set. Come as alkali silicate solutions Soils successively stable silica sols with 5 in particular solutions of sodium or potassium at least two different pH values for silicate or mixtures thereof, the mole of which leads to where these pH values between 2 and 5 ratio SiO.,: Me., 0, where Me is sodium or potassium and 7.5 and 10 respectively. Hum means in the range of 1: 1 to 4.4: 1 2. The method according to claim 1, thereby lying. In practice, especially the commercial labels, that the soils silica io customary alkali metal silicates with a molar ratio of Brine supplies, whose SiO., content below 6 weight SiO.,: Me., O from 1 to 3.6: 1 application. percent lies. It has also proven advantageous to 3. The method according to claim 1 and 2, to produce selsäuresole for the purposes of their characterized in that the soils are acidic SiO., - content below 6 percent by weight, preferably and alkaline silica sols in an amount of 15 0.5 to 3 percent by weight, since these are fed into the, which the soils are particularly stable to a pH value between pH ranges. To a see 5 and 8 sets. To bring about additional stabilization, one can 4. The method according to claim 1 to 3, characterized in the silica sols known stabilizing characterized in that stable kie additives such as preferably urea or humates are added to the soil Selsäuresole supplies, which add by adding Phos-20. phosphoric acid to alkali silicate solutions on the the desired pH value are set. technically easy to implement. It is it is generally expedient to extract the brine on site with the aid of a suitable mixing unit 25 of the alkali silicate solution and acids, preferably Phosphoric acid. A preferred embodiment of the method The invention relates to a method for soil reindeer consists in making the soil alkaline improvement by treating the soils with silica and acidic silica sols in a quantity of added acidic sols. 30 cause the soils to a pH between In many cases, especially with light soils, set 5 and 8. This supply can, if desired, be an improvement of the structure, the water in the event of a single or multiple stimulation and the nutrient uptake by plants harvesting the intended solutions,
wishes. It is known that the soils are used for this purpose. to be treated with alkali silicate solutions and to be treated according to the type of soil. With extremely easy precipitation of these solutions in the soil itself through the soil, larger amounts of substances present there will expediently be brought about. As with soils with an already existing structure, it has also already been proposed to carry out this. In general, about an amount of precipitation is increased by subsequent treatment with approximately 40 to 250 g / m ^{2 of} SiO. ,, calculated as the solids content of speaking electrolyte solutions. 40 of the supplied brine, into consideration.
Finally, it is also known, initially fixed. It has been found that the changing supply Manufacture silica gels and introduce them into the soil with brines of different pH values to incorporate. to be adapted to the respective soil conditions With these known working methods, however, the pH value can easily be achieved and, on the other hand, the stable silica sols mentioned at the beginning for the physical and physiological effects 45 represent an essential factors such as pH value, particle size, more active form of silica, which is a gel agglomerate and Distribution in the soil is easy but allows spontaneous agglomeration and is subject to great fluctuations in j. the soil leads to a favorable structure formation. j The object of the invention is the previous ar- On the so obtained soils can also j Evidence to improve in order to achieve optimal levels of effectiveness, especially ammonium nitrogen to achieve soil improvement. On tend fertilizer components are introduced. Based on extensive tests, it has now been established that the method described above makes possible made that one has a considerably improved We pH adjustment and the degree of kung with the sol supply achieved if one looks at the increase in the sorption forces and the values described below Way of working served. 55 exchange capacity ensures quick and easy The new method for soil improvement is the listless evaluation of nitrogen through planting characterized in that you can follow the soils well. other stable silica sols with at least two It is known to use soil improvers in different pH values, this pH form of certain silicate-containing gels herzu-values between 2 and 5 or 7.5 and 10. 60 places. From the manufacturing process for these gels The silica sols are made by known methods, but the process according to the invention cannot be derived from alkali silicate solutions (see Industrial and Engineering Chemistry, Bodenverbesserung, which consists of several Arbeits-May 63, pp. 1129 to 1132) steps,
by adding acidic compounds receive. As acidic compounds, grain 65 example men salts, organic acids such as in particular Formic acid, acetic acid and humic acids as well as from alkali silicate solution (molar ratio Na ₂ O inorganic acids into consideration. : SiO ₂ like 3.3: 1, concentration 37 ° Be) and tech-