Abstract

Disclosed is a method for preparing a micron-scale spherical weighting material by using iron ore concentrate powder as a raw material: selecting iron ore concentrate powder having a density of ≥4.5 g/cm3as a raw material, passing the raw material through grinding-grading-sorting to obtain high-grade iron ore concentrate powder having a density ≥4.8 g/cm3, and after the high-grade iron ore concentrate powder has passed through pulverization-air flow classification, obtaining micro-powder particles having a particle size distribution D90 of 2-20 μm; applying an electric treatment on the micro-powder particles and conveying same by a conveying system to a high-temperature spheroidizing furnace for spheroidization, when the temperature is heated by a heating system to 1400-1800℃, the particles are melted, and finally collecting the micron-scale spherical weighting material by means of a micro-powder collection device. The density of the prepared spherical weighting material is 4.8 g/cm3-5.6 g/cm3, the particle size distribution D90 is 2-20 μm, and the spheroidization rate is >96%; in addition, the method can be widely applied in high-density, ultra-high-density drilling fluid and cement slurry in the process of oil and gas field exploitation.

IPC Classes  ?

• C09K 8/03 - Specific additives for general use in well-drilling compositions
• C01G 49/06 - Ferric oxide (Fe2O3)
• C01G 49/02 - Oxides; Hydroxides

Abstract

Disclosed is a drainage chute and drainage culvert combined plugging and dredging method for a tailings pond. The method comprises: 1) plugging a drainage chute, involving: respectively backfilling, from bottom to top, the drainage chute with block stone (3), rubble (4) and peastone gravel (5) from an upstream drainage chute water inlet, and arranging an integrated prefabricated top cover plate (6) at the drainage chute water inlet; and 2) plugging a drainage culvert, involving: arranging, from a drainage culvert outlet to upstream, an inverted filter, which is not less than 5 m in length and is respectively composed of block stones, rubble and peastone gravel, pre-burying, in the drainage culvert and before the plugging of the drainage culvert, a certain number of PE drainage and seepage pipes for guiding and draining water seepage in the drainage chute and the drainage culvert, and arranging a closed concrete retaining wall at the drainage culvert outlet. In the present invention, a drainage chute and a drainage culvert are plugged on the basis of "plugging" and "dredging" principles. The method is simple, has strong operability, needs little engineering and has a low engineering cost, and the safety hazards and risks caused by a plugging failure of a flood drainage system can be effectively eliminated or reduced.

IPC Classes  ?

• E03F 3/04 - Pipes or fittings specially adapted to sewers

Abstract

Disclosed in the present invention is a heavy-floating combined beneficiation method for iron-rich high-sulfur sulfate slag, comprising: performing a screening-classification operation on the iron-rich high-sulfur sulfate slag; feeding first-stage cyclone grit and performing a gravity separation-screening operation to obtain first-stage spiral rough concentrate; combining and feeding first-stage spiral rough tailings and second-stage spiral tailings, and performing a screening-ore grinding-classification operation; and combining first-stage cyclone overflow and second-stage cyclone overflow, and performing a concentrated desliming-reverse flotation operation to obtain final concentrate having TFe content of greater than 62.0% and S content of less than or equal to 0.18%, wherein the flow of a reverse flotation system comprises a roughing operation and three cleaning operations. The method of the present invention features strong material adaptability, stable separating index, energy conservation and consumption reduction, and is particularly suitable for performing beneficiation treatment on the iron-rich high-sulfur sulfate slag having TFe content of 50.0-55.5% and S content of 0.7-1.2%.

IPC Classes  ?

• B03B 7/00 - Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
• B03B 9/00 - General arrangement of separating plant, e.g. flow sheets
• B03D 1/018 - Mixtures of inorganic and organic compounds
• B03D 101/02 - Collectors
• B03D 103/02 - Ores

Abstract

A novel ore mining method suitable for multi-stope synchronous mining of a large and thick ore body, comprising: dividing an ore body into several working areas (20) along the trend of the ore body, and dividing each working area into four stopes; digging a vein-through transportation tunnel (5) in the center of the bottom of each working area, and digging, from two sides of the vein-through transportation tunnel, several ore removal passages (11) that pass through all the stopes and function as shoveling and transporting channels for stoping and ore removal, and arranging an ore gathering trench (15) and an undercutting space (7) in the bottom of each stope; all the stopes in each working area sharing one vein-through transportation tunnel, first performing synchronous stoping on a first stope (16) and a fourth stope (19) and filling same after the stoping is completed, then performing synchronous mining on the remaining two stopes. The method can achieve air flow ventilation and improve the working environment of a working surface; all the stopes share one vein-through transportation tunnel, such that the work amount of mining and cutting is reduced, and the production cost in ore mining is lowered; and one working area is subjected to synchronous mining twice, and thus the production efficiency of ores is improved.

IPC Classes  ?

• E21C 41/16 - Methods of underground mining; Layouts therefor

Abstract

22 content of ≤0.20％ and an acid non-soluble substance of ≤0.17％, and a high-purity iron concentrate with TFe > 70.7％. A collector for the reverse flotation operation of the present invention is pepared by heating and modifying dodecylamine and a glacial acetic acid solution at a mass ratio of 4 : 1. According to the method of the present invention, the beneficiation process flow is flexible, stable and reliable, has a strong applicability, and is efficient and energy-saving. The flotation reagent has excellent performances, such as simple preparation, wide sources, small dosage, good selectivity, and environmental friendliness.

IPC Classes  ?

• B03B 9/00 - General arrangement of separating plant, e.g. flow sheets
• B03B 7/00 - Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
• B03D 1/01 - Organic compounds containing nitrogen
• B03D 1/008 - Organic compounds containing oxygen
• B03D 101/02 - Collectors
• B03D 103/04 - Non-sulfide ores

Abstract

22 has a content of 0.18%-0.20%, and an acid insoluble substance has a content of 0.15%-0.17%. At the same time, a high-purity iron concentrate having a TFe grade of 70.86%-71.12% can be obtained. The collecting agent in the reverse flotation process of the present invention is prepared by heating and modification treatments of dodecylamine and a glacial acetic acid solution according to a mass ratio of 4:1. The method of the present invention has a strong applicability, and is highly efficient and energy-saving. The flotation reagent system is simple. The present invention has excellent performances such as wide range of sources, small dosage, better selectivity, and environmental friendliness.

IPC Classes  ?

• B03B 9/00 - General arrangement of separating plant, e.g. flow sheets
• B03B 7/00 - Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
• B03D 1/01 - Organic compounds containing nitrogen
• B03D 1/008 - Organic compounds containing oxygen
• B03D 101/02 - Collectors
• B03D 103/04 - Non-sulfide ores