Lead-cadmium compound conditioner for rice field soil as well as preparation and application methods thereof
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A technology of soil improvement and improver, which is applied in the restoration of polluted soil, etc., to achieve the effects of increasing yield, simple preparation, and high operating efficiency
Active Publication Date: 2013-06-12
廖柏寒 +1
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However, the current research on using limestone, sepiolite, hydroxyapatite, and zeolite to prep
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Embodiment 1
[0034] Weigh the raw materials with the following qualities;
[0035] Calcium carbonate, 30%; Hydroxyapatite, 10%; Sepiolite, 30%; Zeolite, 30%; Among them, calcium carbonate is light calcium carbonate, whiteness > 90, particle size > 200 mesh, sedimentation volume (2.4 -2.8 mL / g); calcium content in hydroxyapatite composition is 22%-27%, phosphorus content is 9%-12%, particle size > 200 mesh; sepiolite composition > 80%, sedimentation value 800-850, water content 200 mesh; zeolite is artificial zeolite, particle size > 200 mesh;
[0036] Stir the above raw materials continuously for 30 minutes in the stirring device, and avoid adding water during stirring to make a lead-cadmium composite improver;
[0037] Arrange 5 sampling points according to the plum blossom pattern, collect 0-20cm surface soil, and mix evenly; the soil is naturally air-dried to remove debris, crushed and screened with a 0.149 mm nylon sieve; the total amount of lead and cadmium is used HCl-HNO 3 -HClO ...
Embodiment 2
[0044] Compared with Example 1, the present embodiment differs in that the quality of each raw material is:
[0046] After the paddy field is improved, the exchange state content of heavy metal lead and cadmium in paddy field soil can be reduced by 97% and 94% respectively; the content of heavy metal lead and cadmium in rice can be reduced by 30% and 32% respectively; the yield of rice can be significantly increased 30%.
Embodiment 3
[0048] Compared with Example 1, the present embodiment differs in that the quality of each raw material is:
[0050] After improving the paddy field, the exchange state content of heavy metal lead and cadmium in paddy field soil can be reduced by 99% and 97% respectively; the content of heavy metal lead and cadmium in rice can be reduced by 45% and 36% respectively; the yield of rice can be significantly increased 35%.
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Abstract
The invention discloses a lead-cadmium compound conditioner for rice field soil as well as preparation and application methods of the lead-cadmium compound conditioner. The conditioner is composed of the raw materials in mass fractions: 30-50% of calcium carbonate, 5-10% of hydroxyapatite, 20-30% of sepiolite and 20-30% of zeolite; the preparation of the conditioner comprises the following steps of: weighing various raw materials according to the mass fractions of the components of the lead-cadmium compound conditioner; continuously stirring the various raw materials in a stirring device for at least 30 min, and thoroughly stirring and evenly mixing all the materials; and the method of application of the conditioner comprises the following steps of: (1) analyzing the total quantity of lead and cadmium in the rice field and the content of lead and cadmium in exchange state; (2) determining the pollution level of the rice field soil by using an evaluation model; (3) applying the lead-cadmium compound conditioner according to the lead-cadmium pollution level in the rice field, and applying the lead-cadmium compound conditioner to the slightly polluted rice field at 100-150 kg/mu, to the mildly polluted rice field by 150-300 kg/mu and to medium-polluted rice field at 300-600 kg/mu, and balancing and stabilizing for 10-15 days; and (4) analyzing and measuring the content of lead and cadmium in exchange state in the rice field, and if the fixed rate is lower than 90%, additionally applying the conditioner at 100-150 kg/mu.
Description
technical field [0001] The invention relates to rice safety production technology for lead-cadmium polluted paddy fields, in particular to a lead-cadmium compound modifier for paddy field soil and a preparation and application method thereof. Background technique [0002] The farmland soil distributed around the industrial and mining areas is facing more and more serious environmental problems. The heavy metal pollution in the rice fields is very serious, especially the industrial and mining wastewater irrigated the rice fields, resulting in excessive accumulation of toxic heavy metals in the rice field soil. Among them, lead, Cadmium has the highest pollution level, and these heavy metals can easily enter the human body through the food chain, posing serious health risks to the human body. Chemical improvement technology is an in-situ fixed repair technology, which is currently one of the most effective methods for the treatment of heavy metal pollution in soil, that is, th...
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