Method for cleaning of sand from toxic substances and cleaning composition

A harmful substance, clean technology, applied in the field of clean sand, can solve problems such as increasing process cost

Active Publication Date: 2019-07-30
朱莉卡普利茨米克
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Implementation of the process according to the cited patent application results in a large amount of contaminated sand of approximately 40 wt% at the end of the process which needs to pass through the process several times in order to be cleaned, which significantly increases the cost of the process

Method used

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  • Method for cleaning of sand from toxic substances and cleaning composition
  • Method for cleaning of sand from toxic substances and cleaning composition

Examples

Experimental program
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Effect test

Embodiment Construction

[0061] The sand is distributed into a receiving hopper 1 where a vibrating motor shakes off adhering material. The sand is conveyed by the conveyor belt 2 to the vibrating screen 3 with an opening size of 3 mm for dry screening. The material remaining on the screen is the paint and metal flakes produced during the blasting process and deposited as such. Products that pass through the sieve and have a size of up to 3mm are transferred to the rubbing machine 4 by a conveyor belt. Intensive cleaning / scrubbing of grit in thick mud at friction machine 4 by adding water from tank 4 (10:1-1:1 solid part: liquid part ratio): per ton of sand from tank / distributor 6 1 kg of calcium oxide and 2 liters of aqueous solution of disodium metasilicate, sodium carbonate, benzalkonium chloride and non-ionic surfactant per ton of sand from the tank / dispensing pump 7. The washed sludge is then gravity-fed to the dehydrator 8 where the sand is separated in two stages of sieves with meshes of 0.5m...

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Abstract

The method for cleaning sand which contains toxic and hazardous substances consists of the following steps: a) sieving the contaminated sand with the sieve (3), b) cleaning / scrubbing the contaminatedsand in the attrition machine (4) in the slurry with adding of water from the water tank (5) for the purpose of removing toxic and dangerous substances as well as grease from the surface of the grainsof sand, c) grading / dripping on the dehydrator (8), in which cleaned sand and sludge are obtained, d) sedimentation of sludge in the conical vessel (14) and removal of sludge by filtration, e) separation of cleaned sand by grain size by using gravity concentration at the slurry separator (9 and 9') and concentration tables ( 10 and 10') where cleaned sand and wate-rock are obtained, f) drying ofcleaned sand, grading by grain size and storage and packing of sand graded in such manner, water, calcium oxide and aqueous solution of disodium metasilicate, sodium carbonate, benzalkonium chloride and ionic and / or non-ionic surfactants are added in the step b) of the sand cleaning process, which, when mixed within the attrition machine (4) create a mixture for the cleaning of sand and in the step d) filter press (17) is used for making an inert sludge cake.

Description

[0001] Description of the invention technical field [0002] The present invention relates to a method of cleaning sand used as an abrasive for cleaning and polishing metal surfaces with a jet of liquid and to a composition for cleaning soiled sand. More specifically, the present invention relates to cleaning sand contaminated by heavy metals during blasting and to a three-component composition for cleaning sand contaminated by heavy metals. Examples of types of sand used as abrasives include gravel, quartz sand, black and brown corundum, steel balls, and garnet. [0003] According to the International Patent Classification, the invention is classified in class A 62D 3 / 00 against chemicals for rendering hazardous chemicals harmless; and in area B03B - Separation of solid materials with liquids, more precisely B03B 9 / 00 - General arrangement of the separation unit. [0004] technical problem [0005] During the cleaning and polishing of metal surfaces with liquid jets of ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/00B24C9/00C11D1/62C11D3/04C11D3/08C11D3/10
CPCB03B9/00B24C9/006C11D1/62C11D3/04C11D3/08C11D3/10B07B15/00Y02P70/10
Inventor 朱莉卡·普利茨米克
Owner 朱莉卡普利茨米克
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