Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Lead-cadmium compound conditioner for rice field soil as well as preparation and application methods thereof

A technology of soil improvement and improver, which is applied in the restoration of polluted soil, etc., to achieve the effect of small impact, high operation efficiency and short cycle

Active Publication Date: 2015-02-18
廖柏寒 +1
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on using limestone, sepiolite, hydroxyapatite, and zeolite to prepare a mixed amendment that can effectively fix lead and septum in soil has not yet been reported.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lead-cadmium compound conditioner for rice field soil as well as preparation and application methods thereof
  • Lead-cadmium compound conditioner for rice field soil as well as preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

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 plum blossom pattern, collect 0-20cm surface soil, mix evenly; soil is air-dried naturally to remove sundries, crushed and screened with 0.149 mm nylon sieve; the total amount of lead and cadmium is used HCl-HNO 3 -HClO 4 Wet digest...

Embodiment 2

[0044] Compared with Example 1, the present embodiment differs in that the quality of each raw material is:

[0045] Calcium Carbonate, 50%; Hydroxyapatite, 5%; Sepiolite, 20%; Zeolite, 25%;

[0046] After improving the paddy fields, the exchangeable 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:

[0049] Calcium Carbonate, 40%; Hydroxyapatite, 10%; Sepiolite, 30%; Zeolite, 20%;

[0050] After the paddy field is improved, 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%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 廖柏寒周航曾敏周歆吴燕明曾卉邱琼瑶
Owner 廖柏寒
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com