Stowing mixture

FIELD: oil-and-gas production.

SUBSTANCE: stowing mixture contains, wt %: halite wastes of reprocessing of potassic ores 96.5-98.3, bonding agent - magnesia cement 1-2, lignosulfonate 0.7-1.5%.

EFFECT: achievement of required strength of backfilling at minimal content of bonding agent.

1 tbl, 1 dwg

 

The invention relates to mining and can be used in underground mining with the mined-out space.

Known composition filling mixtures for potash mines containing waste beneficiation of potash ores, lime, bischofite and water [1]. The disadvantages of the above-mentioned mixture are low motility, low strength characteristics and the expensive binding components.

The closest to this invention is the composition of the filling mixture containing 30 to 90 wt.% clay-salt waste processing of potash ores and 10-70 wt.% fly ash [2]. The disadvantage of this backfill mix is the increased consumption of binder component and the associated costs.

The technical result is the achievement of adequate strength bookmarks with the minimum content of the additional components.

The technical result is achieved by the composition of the filling mixture, including halite waste processing potash, magnesia binder and a chemical additive lignosulfonate in the following ratio, wt.%:

Halite waste to 96.5-98,3

Magnesia cement - 1-2

Lignosulfonate - 0,7-1,5

Halite wastes are solids, flotation or chemical beneficiation of potash ores. Their status is in depends on the composition of the ore, way of its processing, equipment and other Halite waste contains mainly: NaCl - 95%, KCl - 2%, CaSO4- 2%, insoluble residue of 1.7%, MgCl2- 0,1%, moisture - 10-12%.

As magnesia binder can be used: magnesia cement, caustic magnesite, waste containing magnesium oxide. Experiments have shown that the strength of the array increases with increase in the content of magnesia binder, which is the most expensive component of the mixture. The inventive composition contains a minimum amount of binder that is cost-effective.

Lignosulfonate is anionic surfactant, which is a waste of pulp and paper industry. The optimum content of the lignosulfonate were verified experimentally and is 0.7-1.5 wt.%. This content allows you to maximize the strength of the filling mixture (see drawing).

When mixed halite wastes with magnesia binder and zatvoreniem mixture with a saturated solution of salt halite wastes dissolved in it lignosulphonates occurs hardening backfill array mainly due to the formation of new crystal structures of hydrochloridw magnesium. In addition, the additive-lignosulfonate can reduce the amount of saturated solution required for mixing the mixture at 15-20%, with the care required for pipeline transport mobility of the mixture, that, in turn, contributes to the recruitment of additional strength of the array.

To obtain optimal filling mixture composition components backfill mixture was mixed in a certain ratio under laboratory conditions. The resulting mixture is prepared samples - cubes 7󬱟 cm and tested in uniaxial compression at 7, 28, 60, 90 days. The results are given in table 1.

Table 1
Content, wt.%In/TStrength specimens in uniaxial compression, MPa
wastemagnesia cementlignosulfonateThe duration of curing, the day
7286090
98110,1250,11,21,71,8
97 210,1250,151,62,22,4
991-0,150,10,6511,25
99-10,13-0,80,951
100--0,15-0,10,250,25

As can be seen from the test results, the proposed compositions of the filling mixture gaining the necessary strength with the minimum content of the additional components.

Sources of information

1. Inventor's certificate SU 386145, CL E21F 15/00, 1971.

2. Inventor's certificate SU 1645565, CL E21F 15/00, 1988. (Prototype).

Backfill mixture containing waste processing of potash ore and a binder, characterized in that it content is t halite waste processing of potash ores, as knitting - magnesia cement and advanced chemical additive - lignosulfonate in the following ratio, wt.%:

Halite waste96,5-98,3
Magnesia cement1-2
Lignosulfonate0,7-1,5



 

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