Heap construction process for fine particle industrial solid waste and application thereof

Abstract

A heap construction process for fine particle industrial solid waste comprises the following steps that the fine particle industrial solid waste is screened into a plurality of granularity grades; the graded fine particle industrial solid waste is subjected to grading and blending according to the set nonuniformity coefficient and curvature coefficient, then curing is conducted, and a graded discrete body is obtained; and the graded discrete body is subjected to thin-layer heap construction. The application mode of the heap construction process in heap bioleaching comprises the steps that after a bottommost layer and an impermeable layer are laid, a layer of coarse sand is laid as a bottom layer; ore with the grain size of 10-15 mm and ore with the grain size of 5-10 mm serve as a first-grade buffering layer and a second-grade buffering layer on the bottom layer, and then heap construction is conducted through the heap construction process; pre-spraying is conducted through a dilute sulphuric acid solution after a heap is constructed; and microorganisms are introduced when the pH of the spraying percolate is stabilized to be 1-2, and bioleaching begins to be conducted. The heap construction process for fine particle industrial solid waste can remarkably improve the permeability of a heap leaching system, ensure uniform seepage and facilitate microbial growth.

Description

technical field [0001] The invention belongs to the field of microbial hydrometallurgy, in particular to a high-efficiency bioheap leaching process for fine-grained industrial solid waste. Background technique [0002] Mineral resources are an important material basis for the development of human society and the construction of the national economy. The rapid economic growth is closely related to the massive consumption of mineral resources. At present, more than 70% of agricultural production raw materials, more than 80% of industrial raw materials and more than 90% of energy in China come from mineral resources. However, my country's mineral resources are of extremely low grade, associated or symbiotic with many ores, complex and difficult to handle, and most of them are small and medium-sized mines. Traditional mineral processing and metallurgical processes cannot effectively process these mineral resources, resulting in low resource availability, long production processe...

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Problems solved by technology

For the heap leaching technology in my country, the research on heap leaching technology, the establishment of efficient heap leaching system and how to improve the permeability of the heap leaching system is extremely scarce, especially in fine-grained industrial solid wastes such as fine-grained tailings and waste ores. Heaping technology has lagged far behind the practical application requirements, which to some extent limits the further development and application of heap leaching technology in my country

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