Method for supercritically washing sea sand, river sand and hill sand

Abstract

The invention discloses a method for supercritically washing sea sand, river sand and hill sand, which mainly applies two-phase coexistence washing water formed by mixing gaseous ozone, carbonic acid gas and liquid water, overcomes the capillary phenomenon caused by physical characteristics viscosity and surface tension of water, and generates supercritical washing to remove substances on the surface of the sea sand which are harmful to cement, reinforcing steel bar and the like, such as chloride, sulfate, organic substances, algae and the like. The ozone as a strong oxidizing agent plays a role in decomposing the organic substances, so when high-concentration ozone water is used as washing water, the ozone water has high efficiency and low cost in removing harmful ions of the sea sand or the river sand, and has the characteristic of no harmful substance residue; and the washed sea sand does not have odor, and has low content of ash, and can become high quality sand for construction and engineering.

Description

technical field [0001] The invention relates to a method for supercritical washing of sea sand, river sand and mountain sand, in particular to a method. Background technique [0002] Sea sand is generally divided into estuary sand and deep-sea sand, and estuary sand has a finer particle size. It is known that the following four sea sand washing methods are more economical: [0003] (1) Immersion dechlorination method (2) Water dechlorination method (3) Natural stacking dechlorination method (4) Mechanical water wheel dechlorination method. [0004] Table I [0005] [0006] The mechanical dechlorination method is represented by POWERSCREEN in the United Kingdom. Polymer rubber plume is added to sea sand cleaning, and precipitated ash is the most advanced. Looking at the four methods, the common disadvantage of the first three is poor quality stability (as shown in Table 1). (shown in the washing sea sand detection table). It cannot be used as high-quality construction ...

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Problems solved by technology

[0006] The mechanical dechlorination method is represented by POWERSCREEN in the United Kingdom. Polymer rubber plume is added to sea sand cleaning, and precipitated ash is the most advanced. Looking at the four methods, the common disadvantage of the first three is poor quality stability (as shown in Table 1). washing sea sand test table)

It cannot be used as high-quality construction sand; the fourth method is to add polymer feathers to the POWERSCREEN sea sand cleaning in the UK to make the mud sediment easier to clean, but adding too little will not clean it, adding too much sea sand Marl increases, from the above traditional sea sand washing methods, there is no one that can produce economically and quickly, and the quality is very stable and poor is its common point, but there is a method for supercritical washing sea sand, river sand, and mountain sand of the present invention

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