Method of the calculating of the physical, technical and operational characteristics of carbonate sapropel in borehole hydraulic mining use

The article presents a method for calculating the main characteristics of sapropel lying under peat in experimental area of Gala-Kovalevskoye peat deposit. It has been shown that in the case of extracting carbonate sapropel in the area using borehole hydraulic mining technology, the area occupied by the drainage network is considered to be a loss of balance reserves. The coefficient of balance reserves use was 0.93. With sapropel pulp moisture content of 97 %, the theoretical yield of air-dry matter, with conditional moisture content of 60 %, from 1 m3 is 0.075 t/m3. Two methods for the determining of the water addition coefficient are considered: by the mass of the developed sapropel deposit and its moisture content, and by dry matter content in the deposit and pulp. Field experiments have shown that when extracting carbonate sapropel using a borehole method, an average dry matter content in the pulp is 3%. In regard to sapropel with the moisture content of 73.4 %, lying under the layer of peat in the experimental area, water addition coefficient was 7.9 per 1 t of sapropel with pulp moisture content of 97 %. The graph of the required amount of water addition has been given depending on the sapropel moisture content in the deposit and the pulp moisture content. It has been shown that there is an optimal pulp moisture content that ensures, under the given conditions, the maximum sapropel extraction program and the rational zone of rheological parameters within which the hydrotransport of sapropel pulp is advisable.

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