30results about How to "Low cost recycling" patented technology

A method of recovering petroleum from dormant oil wells or increasing the production of oil wells. An alkali or alkali earth carbonate is introduced into a water layer associated with a subterranean petroleum reservoir and / or an explosive composition is introduced into an oil layer associated with a subterranean petroleum reservoir. CO2 gas is produced by reacting the alkali or alkali earth carbonate with an acid and / or by detonating the explosive composition. An explosive composition can be introduced and detonated to achieve sufficient CO2 gas production to increase pressure within the subterranean petroleum reservoir.

A system and process for recovering copper from a copper-containing ore, concentrate, or other copper-bearing material to produce high quality cathode copper from a leach solution without the use of copper solvent / solution extraction techniques or apparatus. A process for recovering copper from a copper-containing ore generally includes the steps of providing a feed stream containing comminuted copper-containing ore, concentrate, or other copper-bearing material, leaching the feed stream to yield a copper-containing solution, conditioning the copper-containing solution through one or more physical or chemical conditioning steps, and electrowinning copper directly from the copper-containing solution in multiple electrowinning stages, without subjecting the copper-containing solution to solvent / solution extraction prior to electrowinning.

A method of recovering petroleum from dormant oil wells or increasing the production of oil wells. An alkali metal or alkaline earth metal carbonate is introduced into a water layer associated with a subterranean petroleum reservoir and / or an explosive composition is introduced into an oil layer associated with a subterranean petroleum reservoir. CO2 gas is produced by reacting the alkali metal or alkaline earth metal carbonate with an acid and / or by detonating the explosive composition.

The invention relates to a recovery and treatment method of waste sulfuric acid, comprising S1: performing defluorination pretreatment on waste sulfuric acid; S2: transferring waste sulfuric acid to a reaction kettle, adding magnesium oxide for reaction; S3: performing pressure filtration on the reaction solution, and transferring the waste residue to Waste residue storage tank, the filtrate is transferred to activated carbon filtration equipment; S4: The mother liquor of magnesium sulfate is separated from the first crystallization tank to detect the content of potassium bisulfate. According to whether the content of potassium bisulfate in the mother liquor reaches the predetermined threshold, it is decided whether the mother liquor should continue to circulate or recover sulfuric acid Potassium hydrogen is recycled. The method and device of the present invention can realize the recovery of potassium hydrogensulfate in waste sulfuric acid, and through the circular purification of the mother liquor, when the concentration of potassium hydrogensulfate in the mother liquor does not reach the threshold value, the mother liquor is returned to the reactor to continue to increase the potassium hydrogensulfate of the mother liquor Concentration, when the concentration of potassium bisulfate in the mother liquor reaches the threshold, the mother liquor is transferred to the crystallization tank, magnesium oxide is added to generate potassium magnesium sulfate and the material is separated and discharged, realizing the low-cost recovery of potassium bisulfate in waste sulfuric acid.

The invention discloses a method for recycling ilmenite from vanadium titano-magnetite iron dressing tailings. The method comprises the steps that the specific susceptibility of main gangue in the iron dressing tailings, the specific susceptibility of the ilmenite in the iron dressing tailings and the content of TiO2 in the iron dressing tailings are determined; when the iron dressing tailings meet the condition 1, the iron dressing tailings are subjected to first-section strong magnetic separation, first-section strong magnetism concentrates are subjected to one-time or multi-time reselection, and gravity concentrates are obtained; the gravity concentrates are subjected to first-time flotation and one-time or multi-time electric separation, and ilmenite concentrates are obtained, wherein the condition 1 can be shown in the formula: X1>(X2*60%), the total amount of the iron dressing tailings serves as a standard, the content of the TiO2 in the iron dressing tailings is lower than 5 wt%, X1 is the specific susceptibility value of the main gangue in the iron dressing tailings, and X2 is the specific susceptibility value of the ilmenite in the iron dressing tailings; and otherwise, the iron dressing tailings are subjected to a strict granularity classification method. By mean of the method, the production cost of the ilmenite is reduced, and the grade of the TiO2 of selected raw ore obtained after electric separation and flotation is improved.

The invention discloses a method for reeling silk at low temperature by utilizing strongly alkaline electrolyzed water, falling into silk making technical field. The method includes subjecting common tap water to electrolytic treatment via water electrolyzer or electrolytic cell, to obtain strongly alkaline electrolyzed water with pH of 11.0-12.0; performing constant-temperature oscillation swelling soaking treatment on silkworm cocoon in strongly alkaline electrolyzed water at 60-80 DEG C directly for 5-10 min; and taking strongly alkaline electrolyzed water as reeling hot water bath, transferring the swollen silkworm cocoon to the reeling hot water bath at 40-70 DEG C, and immediately reeling silk, to obtain raw silk product. The inventive method performs reeling at low temperature, to improve product quality and save energy. The invention can realize industrial production of strongly alkaline electrolyzed water at low cost and high yield, high-efficiency low-cost recovery of sericin, and cyclic utilization of reeling waste water after simple purification treatment, to thereby avoid environmental pollution caused by a large amount of waste liquid.

The invention discloses an ammonium magnesium phosphate slow release fertilizer and a preparation method thereof, belonging to the technical field of waste water treatment. The ammonium magnesium phosphate slow release fertilizer contains at least one of potassium, iron, calcium, zinc, titanium and sulfur and a rare earth, wherein the rare earth is counted on the basis of the weight of an rare earth oxide (REO); the sum of the content of at least one of the potassium, iron, calcium, zinc, titanium and sulfur and the content of the REO is 0.01-10 percent by weight; the content of P2O5 is 15-49percent by weight; the content of N is 3-10 percent by weight; and the content of MgO is 16-26 percent by weight. In the preparation method, waste water is taken as a raw material, the ammonium magnesium phosphate slow release fertilizer is provided, so that valuable resources such as nitrogen, phosphorus, rare earth, magnesium and the like in the waste water are effectively recycled at low cost,the problem of waste water pollution is solved, and the valuable resources such as nitrogen, phosphorus, rare-earth, magnesium and the like in the waste water are effectively recycled at low cost.

The invention relates to a method for reducing the consumption of a copper extractant in a copper extraction process by a nitric acid system. By adopting the method, the problems of interphase substance increase, difficult phase splitting, low extraction efficiency, large extractant consumption and the like caused by the oxidative deterioration of the extractant are avoided to the greatest extend mainly by reducing the oxidability of an extraction solution and improving the oxidation resistance of the extractant, so as to reduce the consumption of the extractant in the nitric acid system and to realize the efficient and low-cost recycling treatment of the copper containing acidic wastewater.