Soil remediation stabilizer prepared from high-iron tailings and preparation method and application thereof

A soil remediation and stabilizer technology, applied in the field of remediation of heavy metal polluted soil, can solve the problems of high cost of raw materials, cumbersome use process, complicated preparation process, etc., and achieve the effects of low cost of raw materials, simple use method, and simple preparation process.

Active Publication Date: 2019-05-24
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the improver itself is complicated, and the price of some raw materials is high, and the soil improver needs to be broadcast three times to repair the soil. The use process is cumbersome, the amount of work is large, and the maintenance time is too long

Method used

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  • Soil remediation stabilizer prepared from high-iron tailings and preparation method and application thereof
  • Soil remediation stabilizer prepared from high-iron tailings and preparation method and application thereof
  • Soil remediation stabilizer prepared from high-iron tailings and preparation method and application thereof

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Experimental program
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Effect test

Embodiment approach

[0025] The invention provides a preparation method for preparing a soil remediation stabilizer from high iron tailings. Include the following steps:

[0026] S101: Grinding the high-iron tailings, hydroxyapatite, fly ash, and molybdenite for 1-3 hours respectively, and passing the ground products through a 100-200 mesh sieve. The high-iron tailings are one or more of iron tailings, copper tailings, and vanadium-titanium tailings with an iron element content of 10% to 20%. The main component of molybdenite is MoS 2 , The purity is 90-95%.

[0027] S102: fully mix 40-60 parts by mass of the ground high-speed iron tailings, 10-30 parts by mass of fly ash and 10-20 parts by mass of molybdenite, immerse in strong alkali solution for 1-2 hours, and then sinter. The strong alkali solution is potassium hydroxide or sodium hydroxide solution with a mass concentration of 40%, the sintering temperature is 500-800° C., and the sintering time is 3-5 hours.

[0028] S103: Grinding the s...

Embodiment 1

[0037] The polluted soil comes from a chemical polluted site left after the relocation of a pesticide factory in Tianjin. Using step S201 to detect it, the main heavy metal pollutants are Cd, Zn, Cu. The high-speed iron tailings are iron tailings from Luanping County, Hebei Province. The main components are shown in Table 1.1. The main component of molybdenite used is MoS 2 , with a purity of 90%.

[0038] Table 1.1: Main components of high iron tailings in Example 1

[0039] all iron

silica

magnesium oxide

Calcium Oxide

10.55％

41.88％

14.448％

13.362％

[0040] (1) Preparation of soil remediation agent stabilizer:

[0041] S101: Grinding the high-iron tailings, hydroxyapatite, fly ash, and molybdenite for 1 hour respectively, and passing the ground products through a 100-mesh sieve.

[0042] S102: Mix 40 parts by mass of the ground high-speed iron tailings, 20 parts by mass of fly ash, and 20 parts by mass of molybdenite, immerse in a...

Embodiment 2

[0053] The contaminated soil came from soil contaminated by hazardous waste produced by a metal surface processing factory in Tianjin. Using step S201 to detect it, the main heavy metal pollutants are Cd, Zn, Cu, Pb. The high-speed iron tailings are copper tailings from Luanping County, Hebei Province. The main components are shown in Table 2.1. The main component of molybdenite used is MoS 2 , with a purity of 95%.

[0054] Table 2.1: In Example 2, the main components of high tailings

[0055] all iron

silica

magnesium oxide

Calcium Oxide

17.15％

52.80％

4.259％

1.154％

[0056] (1) Preparation of soil remediation agent stabilizer:

[0057] S101: Grinding the high-iron tailings, hydroxyapatite, fly ash, and molybdenite for 2 hours respectively, and passing the ground products through a 200-mesh sieve.

[0058] S102: Mix 40 parts by mass of the ground high-speed iron tailings, 10 parts by mass of fly ash, and 20 parts by mass of molybde...

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Abstract

The invention relates to a soil remediation stabilizer prepared from high-iron tailings and a preparation method and application thereof. The remediation stabilizer comprises, by mass, 40-60 parts ofthe high-iron tailings, 10-30 parts of fly ash, 10-30 parts of hydroxyapatite and 10-20 parts of molybdenite. During preparation, the soil remediation stabilizer used for heavy metal contaminated soilremediation is prepared through mixing, ball milling, hydrothermal treatment and drying. The preparation method is simple, the raw materials are easy to obtain, the price and cost are low, the usingprocess is simple and easy to operate, the curing time is short, and the curing effect on common soil contamination elements Cu, Pb, Cd, Ni and Zn is achieved.

Description

technical field [0001] The invention relates to the remediation of heavy metal polluted soil, in particular to a method and application of a soil remediation stabilizer prepared from high-iron tailings. Background technique [0002] In recent years, the process of industrialization and urbanization has accelerated, and soil pollution has become increasingly serious. Heavy metal pollution is one of the main types of soil. Soil heavy metal pollution is mainly caused by irrational development of mineral resources, irregular smelting discharge, long-term sewage irrigation of soil, dust precipitation caused by human activities, and soil pollution caused by the application of chemical fertilizers and pesticides. Heavy metals that pollute soil include cadmium (Cd), mercury (Hg), lead (Pb) and metalloid arsenic (As) and other elements with significant biological toxicity, as well as elements with certain toxicity such as zinc (Zn), copper (Cu) , Nickel (Ni) and so on. Metal pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06B09C1/08
Inventor 薛刚罗雄一梁金生王东哲赵光远
Owner HEBEI UNIV OF TECH
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