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A kind of calcium-based heavy metal soil remediation agent and preparation method thereof

A soil remediation agent and heavy metal technology, applied in the field of soil remediation, can solve the problems of human health hazards, difficult degradation, no use value, etc., and achieve the effect of remediation

Active Publication Date: 2018-08-10
HUNAN HENGSHAN BICHENG CALCIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because soil pollution is not as easy to spread or dilute as air pollution or water pollution. Once heavy metals enter the soil, it is very difficult to degrade, and the soil polluted by heavy metals has almost no use value, and the crops grown are harmful to human health. would be very dangerous

Method used

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  • A kind of calcium-based heavy metal soil remediation agent and preparation method thereof
  • A kind of calcium-based heavy metal soil remediation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1. A calcium-based heavy metal soil restoration agent. The ingredients are in mass %, specifically: dust collection ash: 60%, industrial ferrous sulfate heptahydrate: 6%, bentonite: 7%, calcium humate: 9% , Calcium phosphate: 18%.

[0016] The dust-collecting ash is activated lime kiln dust, the activity of the activated lime is 300-420ml, the particle size of the dust-collecting ash is 80 mesh, and the main components are in mass %, specifically: calcium oxide: 35%, calcium carbonate: 43%, and the rest are sediment, magnesia, cinder, silicon compounds, sulfur compounds, etc.

[0017] The content of described industrial ferrous sulfate anhydrous is 74.6%.

[0018] The calcium phosphate is calcium phosphate, or calcium hydrogen phosphate, or calcium dihydrogen phosphate, or a mixture of calcium phosphate and calcium hydrogen phosphate, or a mixture of calcium phosphate and calcium dihydrogen phosphate, or phosphoric acid A mixture of calcium hydrogen phospha...

Embodiment 2

[0025] Embodiment 2. A calcium-based heavy metal soil restoration agent. The ingredients are in mass %, specifically: dust collection ash: 70%, industrial 7-water ferrous sulfate: 5%, bentonite: 7%, calcium humate: 3% , Calcium phosphate: 15%.

[0026] The dust-collecting ash is activated lime kiln dust, the activity of the activated lime is 300-420ml, the particle size of the dust-collecting ash is 80 mesh, and the main components are in mass %, specifically: calcium oxide: 32%, calcium carbonate: 47%, and the rest are sediment, magnesia, cinder, silicon compounds, sulfur compounds, etc.

[0027] The content of described industrial ferrous sulfate anhydrous is 71%.

[0028] The calcium phosphate is calcium phosphate, or calcium hydrogen phosphate, or calcium dihydrogen phosphate, or a mixture of calcium phosphate and calcium hydrogen phosphate, or a mixture of calcium phosphate and calcium dihydrogen phosphate, or phosphoric acid A mixture of calcium hydrogen phosphate and ...

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Abstract

A calcium-based heavy metal soil repairing agent comprises the following materials by mass: 30 to 85 percent of recovered dust, 0.5 to 20 percent of industrial FeSO4.7H2O, 5 to 40 percent of bentonite, 1 to 20 percent of calcium humate, and 1 to 30 percent of calcium phosphate. The Ca-based heavy metal soil repairing agent is prepared according to a method comprising the following steps: milling bentonite into particles of 50 meshes or more; mixing industrial FeSO4.7H2O, bentonite, calcium humate, calcium phosphate and recovered dust to obtain a mixture I; stirring the mixture I to be uniform; adding 1 to 10 percent of water; stirring for 1 to 2 hours for mixing to obtain a mixture II; allowing the mixture II to stand still for 72 hours or longer to obtain the calcium-based heavy metal soil repairing agent.

Description

technical field [0001] The invention relates to the technical field of soil restoration, in particular to a calcium-based heavy metal soil restoration agent and a preparation method thereof. Background technique [0002] Lime is an important inorganic raw material, which can be divided into ordinary lime and active lime according to its different properties. The activity of ordinary lime is generally within 200ml, and it is mostly fired in earthen kiln and ordinary shaft kiln, mainly for construction and road construction; the activity of active lime can reach 300-420ml, and it is mostly fired in mechanical shaft kiln and rotary kiln. It is mainly used in industries such as smelting iron and steel, chemical industry and power plant desulfurization. For example, the metallurgical lime used in the iron and steel industry must be active lime. Among all active lime production processes, the rotary kiln production process is more advanced at present, because of uniform roasting,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40
Inventor 李绍国
Owner HUNAN HENGSHAN BICHENG CALCIUM IND CO LTD