DD145179A4 - METHOD FOR PRODUCING A SOIL IMPROVING AGENT - Google Patents

Abstract

Process for producing a soil improver, in particular for improving the physical and physico-chemical properties of light soils based on inorganic gels using organic secondary products according to patent 141,389. The aim of the invention is to improve the reversible water absorption capacity of the soil improver according to the invention in order to thereby increase its effect on the water balance of the soil. The process according to the invention comprises mixing solutions of alkali silicates in the form of soda and/or potassium water glasses with and without the addition of a sodium aluminate solution, with the addition of a linear colloid or a linear colloid-forming polymer dispersion, in particular polyacrylamide, polyacrylic acid dispersion, a dispersion of a copolymer of acrylic acid and maleic acid, a dicyandiamide-aldehyde condensate, partially hydrolyzed polyacrylonitrile or polyethyleneimine, and with the highly water-containing secondary products of industrial large and small animal husbandry and/or the natural product processing industry and/or municipal wastewater treatment and/or slaughterhouses.

Description

-A-

a) Process for the preparation of a soil conditioner

b) 'Field of the invention

The invention relates to Ϊ4-Τ 389 a process for the preparation of a soil conditioner to improve the physical and physical and chemical properties of soils, preferably sandy and humu.sarmer soils, based on inorganic gels using organic secondary products .. As another The field of application of the invention is the improvement of growing media and composters,

c) Characteristic of the known technical solutions

To improve the physical and physical-chemical properties of light soils, a process for the preparation of a soil conditioner is known from patent 141 389, which is characterized in that solutions of alkali silicates with and without the addition of! Tatriumalurninatlösung with the highly water-containing secondary products of large and small-scale industrial production and / or secondary products of the natural products processing industry, in particular sulphite liquor from the pulp industry, wastewater treatment! the paper industry and / or waste and

-a-

Slaughterhouse effluents, such as wastewater containing blood and protein, stomach and intestine contents of slaughtered animals and / or poultry slaughter waste. In this case, a hydrous gelatinous soil conditioner is formed. The silica and aluminosilicate gels contained therein undergo a natural aging process, greatly reducing their initial high water absorbency. This limitation of the reversibility of the water absorbability by the soil conditioner has an adverse effect on a long-term improvement in the physical properties of sandy and humus-poor soils.

To increase the economic effectiveness and effectiveness of flocculants based on linear colloids, processes are known according to which silicate-containing linear colloids are prepared by polymerization of their monomers in the presence of sodium metasilicate (US Pat. No. 3,946,061). Since the linear colloids prepared in this way are water-soluble, they are not expected to have any lasting effect on the water retention capacity of light soils.

To improve the properties of alkali metal silicates in soil improvement, water treatment and washing processes, these mono- and / or polyquaternary Η compounds in the form of hydroxides are added (DS-OS 2 021 004, '' Di-OS 2 063 939). This N-gen Yerbindun- intended to increase the solubility of the solid alkali metal silicates and stabilize the silicate brine. Thereby, the gelation necessary for increasing the water holding ability of the bottom soil is prevented. It is known that in order to increase the reversibility of silica gels used for soil improvement, urea is added to them during their production

07 0 4-3-

becomes (Df-OS 2 208 917). However, the effect of the urea-containing silica gel as a reversible water-absorbing soil conditioner is insufficient.

d) Object of the invention

The aim of the invention is the reversible water absorbency of the soil improvers, by reacting alkali silicates with and without the addition of an E'atriumaluminatlösung and the secondary products of industrial large and small animal husbandry and / or secondary products of natural products processing industry and / or wastewater and slaughterhouse waste be prepared to improve.

e) Presentation of the essence of the invention

- Technical tasks

The object of the invention is to delay the aging of the silica gels contained in the soil improver by adding suitable chemical substances and thereby to improve the reversible water absorption capacity of the soil improver.

Features of the invention

According to the invention, the object is achieved such that solutions of alkali metal silicates in the form of the Ilafron- and / or Kaliwassergläser with and without the addition of a solution of sodium aluminate in the Holverhältnissen SiO ₀ : Al (OH) 2 of 1: 0, 1: 1 bin 15: -j and additions of linear colloids or linear colloid-forming polymer dispersions, in particular polyacrylamides, polyacrylic acid dispersions, dispersions of acrylic acid and maleic acid copolymers, water-soluble dicyandiarnide-aldehyde condensates, partially hydrolyze polyacrylonitriles or Polyä'thyleniminen in a mass ratio

Polymer SriO ₂ of 0.1: T to 2: 1, preferably 0.3: 1 to 1 , 3: 1 based on dry mass, with the. strongly water-containing secondary products of industrial large and small animal husbandry and / or the secondary products of the natural products processing industry, in particular sulfite liquor from the pulp industry, wastewater sludge of the pulp and paper industry and municipal wastewater and / or waste and wastewater from slaughterhouses, such as blood and protein containing wastewater, stomach - And intestinal contents of slaughtered animals and / or waste of poultry slaughtering, each mixed at application rates of 0.5 to 30 % dry matter, that the water content of the reaction product at SiO 2: water Lfol ratios of 1.5: 1 to 1: 500 between 10 and 99 %, preferably 85 to 99 % . Urea or other Ji-containing salts and / or phosphoric acid or phosphates can each be added to the soil conditioner according to the invention in an amount of 0 to 5 %, preferably 0 to 2.5 % .

The addition of linear colloids or linear colloid-forming polymer dispersions to the soil conditioner according to the invention gives a mixed gel which has an improved reversible water absorption capacity and improved swelling capacity in the water. It is assumed that the mixed gel. based on the formation of coacervates between the linear colloids and colloidal silicate particles,. whereby the aging process of the silica gel is slowed down. ·. ,

The formation of ivides increases the retention of the organic constituents which are added with the secondary products, so that washing out of these substances is prevented and a slowing down of their microbial degradation and thus a humus accumulation is expected.

Depending on the · dry matter content, the agent according to the invention can be applied with the aid of liquid manure tankers with a high water content or with the known fertilizer spreading technology with a low water content and incorporated into the soil using the known tillage technology.

f) Application examples

Example 1:

A soil conditioner is prepared by mixing together sodium silicate solution having a molar ratio of Na ₂ (J): SiC> 2 = 1: 3 »6, a polyacrylamide and slurry of the following composition:

Na ₂ O · 3.6 SiO ₂ 2.2 % dry matter, polyacrylamide 0.3 % dry matter manure 1.0 % dry matter

At an application rate of 115 t / ha will be the soil

3 111 m of water bound in gel supplied. The capillary water capacity of the treated soil layer of a loamy sandy soil is increased by 8% by volume after drying out the samples twice.

Example 2:

A soil improver is prepared by mixing together atriumsilicate solution having a molar ratio of IJa ₂ O: SiO ₂ = 1: 3 »6» sodium aluminate solution, a polyacrylic acid dispersion and slurry, having the following composition:

Na ₂ O * 3.6 SiO ₂ 1.7 % dry matter

Polyacrylic acid 0.2 % dry matter

NaAl (OH) ^ 0.5 % dry matter

Manure 1.0 % dry matter

At an application rate of 200 t / ha, the soil is supplied with 193% of water bound in a gel

Water capacity of the treated soil layer of a loamy sandy soil is thus increased by 15 volume ^ after two dehydration.

Example 3:

A soil conditioner is prepared by mixing together the solutions of the components and slurry with the following composition:

ITa ₂ O · 3.6 SiO ₂ 1.7 % dry matter dicyandiamide-formaldehyde condensate 0.2% dry mass IaAl (OH), 0.5 % dry matter

Manure 1.0% dry matter

 An exhaust wall quantity of 115 t / ha will hit the ground

¹ 3 111 m of water fed geounden in the gel. The capillary water capacity of the treated soil layer of a loamy sandy soil is thereby increased by 7 volumes after two dehydrations of the samples.

Example 4;

A soil conditioner is prepared by combining the solutions of the components and slurry with the following composition:

Na ₂ O. 3.6 SiO ₂ 1.7 % dry matter

Polyethyleneimine 0.18% dry matter

NaAl (OH) ₄ 0j5 % dry matter

Manure 1.0 % dry matter · ·

At an application rate of 100 t / ha, 95 m of water are bound to the soil in the gel. The capillary water capacity of the treated soil layer of a loamy sandy soil is thus increased by 10% by volume after the soil samples have twice dried out.

Claims (1)

claim 1. A method for producing a soil conditioner, preferably for improving the physical and physico-chemical properties of soils, especially sandy and humus poor soils according to patent 141 389 ^ characterized in that solutions of alkali metal silicates in the form of atron- u: id / or Kaliwassergläsern with and without the addition of a sodium aluminate solution in the molar ratios SiO ₂ : Al (OH) ₃ of 1: 0 or 1: 1 to 15: 1, with an addition of a linear colloid or a linear colloid-forming polymer dispersion, in particular polyacrylamide, Polyacrylsauredispersion, a dispersion of a copolymer from acrylic acid and maleic acid _s a water-soluble dicyandiamide-aldehyde condensate, partially hydrolyzed polyacrylonitrile or polyethyleneimine in a mass ratio polymer: SiO ₂ of 0.1: 1 to 2: 1, preferably 0.3: 1 to 1.5: 1 based Dry matter and with the highly water-containing secondary products of large industrial and Small animal husbandry and / or the secondary products of the natural products processing industry, in particular sulfite waste liquor of the pulp industry, wastewater sludge of the pulp and paper industry and municipal wastewater and / or waste or wastewater of slaughterhouses, such as blood and protein wastewater, stomach and intestinal contents of slaughtered animals and / or waste of poultry slaughter are mixed in each case in application rates of 0.5 to 30% dry matter, that the water content of the reaction product at SiO 2: water molar ratios of 1.5. : 1 to 1: 500 is between -10 and 99, preferably 85-99 % .