Method for grading and utilizing waste material of sandstone system production

Abstract

The invention relates to a method for grading and utilizing waste material of sandstone system production, including the following steps: 1) sieving and washing are carried out; 2) slurry obtained by sieving is subject to separation of fine sand powder and slurry by virtue of a hydrocyclone grading device; 3) the fine sand powder is subject to high frequency sieving and dewatering, and the slurry is placed into a setting device, so as to further separate water and concentrated slurry; 4) water is returned to the washing step, and the concentrated slurry is subject to filter pressing or filtering and then is delivered to a waste material stock yard. In the method for grading and utilizing waste material of sandstone system production provided by the invention, a hydrocyclone grading device is added in slurry sand grading production process to separate fine sand powder and slurry, and a high frequency sieving dewater procedure is adopted, recycling of fine sand powder from slurry is realized, by adopting the method of the invention, more than 90% of useful material can be recycled from slurry, and more than 70% of recycling can be realized after waste water is purified.

Description

technical field [0001] The invention relates to the field of classification and utilization of waste materials produced in sand and gravel systems. Background technique [0002] Sand and gravel are the main materials of concrete. With the continuous development of sand and gravel processing technology, the waste water produced by wet production and the large amount of loss caused by washing have always been the biggest obstacle restricting the development of sand and gravel system production technology, and it is also the largest source of environmental pollution. The dry production technology of the stone system is not yet complete, and it is difficult to adopt the all-dry production process due to the influence of many lithologies (such as limestone). Therefore, wet production is still common. In the first-grade sedimentation treatment method, useful materials and mud cannot be effectively separated, and are only treated as discarded materials, and the discarded materials ...

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Problems solved by technology

[0002] Sand and gravel are the main materials of concrete. With the continuous development of sand and gravel processing technology, the waste water produced by wet production and the large amount of loss caused by washing have always been the biggest obstacle restricting the development of sand and gravel system production technology, and it is also the largest source of environmental pollution. At present, sand The dry production technology of the stone system is not yet complete, and it is difficult to adopt the all-dry production process due to the influence of many lithologies (such as limestone). Therefore, wet production is still common. In the first-grade sedimentation treatment method, useful materials and mud cannot be effectively separated, and are only treated as discarded materials, and the discarded materials have a large water content, which brings great pollution to the transportation road. Special measures to prevent debris flow should also be implemented at the storage site. Traditional The loss rate of the wet production in the flushing link generally reaches about 25% of the system scale, and the water resource reuse rate is less than 50%. Less than 10%, due to the increase in loss, the system scale and water consumption also increased accordingly. The water supply capacity reached 5000t / h, the system wool processing capacity reached 2650t / h, the finished product production capacity was only 2000t / h, and the land area for flushing water treatment reached 1 million m 2 , the total amount of waste slag stockpile is 4 million m 3

[0003] For the treatment of mud, in the prior art, filter presses are used for treatment to recover water resources, but due to the difficulty of separating useful materials, those skilled in the art have not realized that useful materials in mud can be recovered

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