830 results about "Calcium peroxide" patented technology

The invention relates to a stable curing agent of repairing heavy metal and toxic organic matter combined polluted soil. The stable curing agent comprises the following raw materials in percentage by weight: 10-30% of cement, 10-30% of coal ash, 20-50% of clays, 2-10% of an activating agent and 2-20% of an oxidizing agent, wherein the activating agent is a composition of one or more than two of magnesium oxide, aluminum oxide, titanium dioxide or molybdenum trioxide, and the oxidizing agent is a composition of one or more than two of sodium persulfate, calcium peroxide, potassium persulfate and ammonium persulfate. The raw materials are put into a grinder to be uniformly grinded and mixed to prepare the stable curing agent with the specific surface area of 400-800 / kg. The stable curing agent provided by the invention has the characteristics of low cost, good soil repairing effect and simplicity in construction.

The invention relates to a high-efficient combined inhabitor for pyrite in complex sulfide ores and the application method of the inhabitor. The inhabitor comprises calcium superoxide and HA-Na. The inhabitor of the invention can inhibit complex vulcanized iron-bearing minerals selectively, has better inhibition properties for magnetic pyrite, pyrite and arsonopyrite, and is an inhabitor of high selectivity. Compared with the prior inhibitors such as lime, cyanide, bichrome, potassium permanganate, sodium sulfide, sulphite, zinc sulphate and trisodium phosphate, the invention has the advantages of lower use level, good effects, no pollution, and other advantages.

The invention discloses complex calcium lubricating grease and a production technology thereof. The complex calcium lubricating grease comprises base oil and a complex calcium thickener, wherein the base oil accounts for 70-88% of the total weight of the lubricating grease and the complex calcium thickener accounts for12-30% of the total weight of the lubricating grease; the complex calcium thickener is generated by the reaction of acid and calcium hydroxide, and the acid is an acid mixture of high molecular acid, middle molecular acid and low molecular acid, wherein the added amount of the calcium hydroxide occupies 3.80-9.50% of the lubricating grease by weight, and the added amounts of the high molecular acid, the middle molecular acid and the low molecular acid respectively accounts for 1.80-4.50%, 2.10-5.20% and 4.30-10.80% of the total weight of the lubricating grease The production technology comprises the steps of: adding 49-61-6 wt% of base oil and 2.66-6.65 wt% of calcium hydroxide in a reaction kettle and mixing evenly; and then, adding the high molecular acid, the middle molecular acid and the low molecular acid in sequence, adding 0.76-1.90 wt% of calcium hydroxide, adding 0.38-0.95 wt% of calcium hydroxide, refining and grinding. Compared with the prior art, the invention has the biggest advantage of improvement to the hardening phenomenon.

The invention discloses acomposite potassium peroxymonosulfate disinfection tablet which comprises 10.0-70.0 parts by weight of potassium monopersulfate, 1.0-65.0 parts by weight of fillers, 1.0-20.0 parts by weight of adhesives and 0.01-10.0 parts by weight of lubricant, wherein the fillers is formed by one or more then one of sodium sulfate, sodium chloride, potassium chloride, sodium carbonate, sodium bicarbonate, phosphate, inorganic acid, organic acid, starch, dextrin, glucose, solid emulsifier, xylitol and a metal ion complexing agent, the adhesives comprise cellulose, polyvinylpyrrolidone and gelatin; the lubricant is formed by one or more than one of magnesium stearate, talcum powder, micro-powder silica gel, sodium benzoate and polyethylene glycol; in addition, sodium percarbonate, calcium percarbonate, sodium perborate or calcium peroxide 1-2 are added. The invention is convenient to use, has the advantages of quick disintegration and dissolution, can significantly increase the effect of the disinfection tablet and can adjust pH value.

The invention relates to a method for improving acid production quality and acetic acid proportion in anaerobic fermentation of residue active sludge. The method comprises the following steps of firstly, adding calcium peroxide into concentrated residual sludge in a wastewater treatment plant, wherein adding amount of the calcium peroxide is 5%-20% of the weight of the volatile suspended solid in the residual active sludge; then, sealing at 30-40 DEG C, carrying out anaerobic digestion in an anaerobic digestion tank with stirring speed of 100-200rpm, wherein the anaerobic digestion time is 5-10 days. The result indicates that calcium peroxide can promote dissolution of particulate organic substances, can improve acidification degree of deliquescent organic substances and can inhibit a methane production process, so that accumulation of volatile short-chain fatty acid is facilitated and transformation of other acids to acetic acid is promoted; meanwhile, a plurality of harmful organic substances in the sludge are effectively removed, so that the acid production quality in anaerobic fermentation of the residue active sludge is improved. The method disclosed by the invention is simple to operate and gentle in reaction condition, is used for recycling and carrying out harmless disposal on the concentrated residual sludge of the sewage treatment plant, and has very good economic and social benefits.

The invention discloses a removing method for gas recovery well shaft aquo-complex blockage. After an acidic work solution is pumped into a well shaft subjected to aquo-complex blockage, a heating unit that calcium oxide is coated with materials capable of being dissolved by the acidic work solution is then put in. The acidic work solution is a water solution at least comprising hydrochloric acid, a metal corrosion inhibitor and a hydrate inhibitor. According to the method, calcium hydroxide is generated by the calcium oxide in the work solution and acute heat release is caused in the process that the calcium oxide further reacts with acid, the local part of the well shaft aquo-complex blockage is heated, and thus ice blockage can be removed. No large-sized operation apparatus is needed in the method, and the produced heat can be effectively concentrated the local part of the ice blockage, so the thermal efficiency is greatly improved, and the blockage removal time of aquo-complex is greatly shortened; and the method has the advantages that the used agent dosage is small; the operation time is short; the cost is low; the operation is simple and convenient; no new solid sediment is generated in the processing process; and no new well shaft blockage condition can be caused.

The invention discloses a water quality purifying agent. A formula of the water quality purifying agent comprises the following components in parts by weight: 15 to 55 parts of potassium hydrogen persulfate composite salt, 0 to 5 parts of sulfamic acid, 5 to 20 parts of citric acid, 1 to 12 parts of sodium carbonate, 0 to 10 parts of sodium bicarbonate, 0 to 0.5 part of magnesium carbonate, 0 to 9 parts of sodium hexametaphosphate, 15 to 30 parts of calcium peroxide, 0 to 1 part of sodium dodecyl benzene sulfonate, 0 to 2 parts of lauryl sodium sulfate, 0.05 to 0.1 part of polyethylene glycol, 5 to 15 parts of anhydrous sodium sulphate and 15 to 25 parts of composite microbial agent. In the formula of the water quality purifying agent, a composite potassium hydrogen persulfate product detoxifying technology and a sewage treatment technology beneficial for microorganisms to restore the micro-ecological balance are used for substituting the existing product capable of leading to the secondary pollution, the advantages such as fast onset of action and lasting effect can be realized, and the water quality purifying agent can take effect within half an hour; the water modification, detoxifying, bacteriostat and water purifying effect can last for 7 to 10 days, and the treatment on the water pollution and the restoration of the ecological balance can be realized in 7 days to 1 month.

The invention discloses a combination for improving bottom quality of an aquiculture pond, comprising the following components: photosynthetic bacteria 15-20 shares, hay bacillus 15-20 shares, zeolite powder 40-50 shares, and peroxy sodium carbonate or calcium peroxide 3-5 shares. And the invention can quickly complex poisonous heavy metal ions, quickly degrade harmful matters in the pond bottom, such as ammoniacal nitrogen, sulfureted hydrogen, and nitrite, able to improve bottom qualities of most ponds, so as to improve water quality and living conditions of aquatic animals, and able to effectively prevent burst death of aquatic products, such as prawns.

The invention relates to a petroleum-hydrocarbon-contaminated soil repairing medicament and a use method and belongs to the technical field of soil environment repairing. The medicament is composed of sodium persulfate (Na2S2O8), zero-valent iron (Fe <0>) and calcium peroxide (CaO2), and the molar ratio of the Na2S2O8 to Fe <0> to CaO2 is 5: 2: 2. The Na2S2O8 is fed into a slurry system, the Fe <0> and the CaO2 are added for interphase activation, two types of free radicals with extremely high oxidability including a sulfate radical anion and a hydroxyl radical (.OH) can be obtained simultaneously for decomposing petroleum hydrocarbon in soil, wherein the formula of the sulfate radical anion can be found in the specification. According to use parameters of the repairing medicament, the feeding amounts of the sodium persulfate, the zero-valent iron and the calcium peroxide are 2 mmol / g, 0.8 mmol / g and 0.8mmol / g of soil correspondingly; the water soil ratio (milliliter: g) is 2.5: 1; a reaction is performed for 4-8 hours after the water and soil are uniformly mixed; and the water can be used repeatedly. Compared with a traditional chemical method, the range of acted organic pollutants is wider; the Fe <0> and the CaO2 are wide in resource, easy to obtain and low in cost; the two types of activating agents including the CaO2 and the Fe <0> are fed, the activating effect is better, and secondary pollution is avoided; and the reaction is mild, and safety is high.

The present invention provides a contaminated water body bottom mud reoxygenation type repairing agent, a preparation method and applications thereof. The contaminated water body bottom mud reoxygenation type repairing agent is prepared by mixing calcium peroxide, active carbon and polyvinyl alcohol according to a certain ratio, wherein oxygen can be persistently, stably and slowly released through the repairing agent. The repairing agent is directly poured to the surface of bottom mud, and the surface layer of the bottom mud is gradually changed into an aerobic state from an anaerobic state along with long time and effective oxygen release so as to promote aerobic microbial growth and metabolism, strengthen a pollutant degradation process, control releases of nutrients such as N and P in the bottom mud, and reduce a eutrophication degree of the water body, such that the water body is gradually restored to a benign ecological environment. In addition, an oxidation-reduction electric potential of the surface layer of the bottom mud is improved, and the pH value of the surface layer of the bottom mud is correspondingly changed, such that a precipitation rate of heavy metals in the bottom mud is significantly reduced, and contamination on the overlying water body is reduced.

The invention discloses an unsymmetrical lithia battery. The battery takes lithium peroxide as a positive pole active material, lithium peroxide and a catalyst which are uniformly mixed are loaded on a porous carbon material so as to form a positive pole, the material capable of realizing deintercalation of lithium ions is taken a negative pole, and the weight content of lithium peroxide is 1-50% in a composite material. According to the invention, the discharging product lithium peroxide of the traditional lithia battery is directly used as the positive pole active material, the pole material of the traditional lithium ion battery, which is capable of realizing deintercalation of lithium ions, is taken as the negative pole, the damage of negative pole lithium dendrites of a lithia battery to the battery is solved, and meanwhile, the controllable distribution of the discharging product is realized, an unblocked oxygen diffusion channel is guaranteed, and the charge-discharge capacity and cycle performance of the lithia battery are effectively improved.

The invention discloses a concrete expanding agent with triple expansion sources and a preparation method of the concrete expanding agent. The high-performance concrete expanding agent provided by the invention contains calcium oxide, calcium sulfate, calcium sulphoaluminate, magnesium oxide and surfactant. Expansion rate change of the expanding agent and shrinking percentage change of the cement have an adaptive trend, and therefore, after using the expanding agent, the concrete is stable in strength performance, and the performances of the cement or the concrete can be stable for a long time.

The invention discloses an oxygen-release material for ground water in situ aerobic bioremediation, and a preparation method for the same, belonging to the field of oxygen-release material. The oxygen-release material is composed of the following component parts by weight: 11-14 parts of edible calcium peroxide by weight, 10 parts of sodium bentonite by weight, 1-3 parts of monopotassium phosphate by weight, 2-6 parts of ammonium sulfate by weight, 15 parts of river sand by weight and the coagulant (the rest), wherein total weight of the above materials is 70 parts by weight. The preparation method comprises the following steps of: weighing the calcium peroxide, the sodium bentonite, the monopotassium phosphate and the ammonium sulfate, fully mixing and uniformly dispersing the weighed materials; adding the cement and the river sand, adding water after mixing the cement and the river sand uniformly to prepare the mixture into a massive material, and naturally drying by air. The oxygen-release material has high total oxygen-release quantity and smooth oxygen-release speed, effectively prolongs the oxygen-release time, and improves the change cycle of the oxygen-release filler. The pH value and nutrient substances, such as N, P and the like in the water all meet the requirements on growth of aerobic microorganisms.

The invention discloses a sustained oxygen release fertilizer which adopts a mixture comprising calcium superoxide, sodium bentonite and polyvinyl formal. The mass ratio of sodium bentonite to calcium superoxide is 12 to 5, and the mass of the polyvinyl formal is 15 percent of the gross mass of the sustained oxygen release. The sustained oxygen release fertilizer discusses the oxygen release feature and the pH value variation in the condition of aqueous medium. Experimental results show that compared with applying calcium superoxide powder only, the sustained oxygen release fertilizer has the characteristics that the fertilizer effect period is long, the applying method is simple, the production technology is simple, the source of material selected is wide, the material is environmentally friendly, and the sustained oxygen release fertilizer can be widely applied.

The invention discloses an in-situ combined remediation method for petroleum contaminated site soil and relates to a soil remediation method. According to the in-situ combined remediation method, a chemical oxidation reagent is prepared from the following components including sodium persulfate as an oxidant, sodium hydroxide or calcium peroxide as an activator and sodium thiosulfate as a sustained-release agent; a microorganism simulation nutrient is prepared from the following components including sodium phosphate and ammonium sulfate; the molar ratio of the sodium persulfate and the activator is 5:1; the quantity of the sustained-release agent is 1-5 percent of the quantity of the oxidant and the activator; the molar ratio of C, N and P as the nutrients for promoting growth of microorganisms is 120: 10: 1; a phosphorus source is the sodium phosphate (Na3PO4.12H2O); a nitrogen source is the ammonium sulfate ((NH4)2SO4); and a carbon source is petroleum pollutants and is estimated according to the actual pollutant degree. The in-situ combined remediation method for the petroleum contaminated site soil can reach the purpose of completely remediating the long-term petroleum contaminated site soil, and thus solving the problems of difficulty in remediating aged contaminated soil microorganisms, higher chemical oxidation cost and larger environmental influence and lowering the remediation cost.

The invention discloses a thickened oil well polymer plugging remover. The plugging remover is prepared from the following materials in percentage by mass: 0.5 to 5.0 percent of gel breaker, 1.0 to 10.0 percent of cleaning agent, 0.1 to 5.0 percent of clay stabilizer, 0.1 to 5.0 percent of iron ion stabilizer, 0.1 to 5.0 percent of surfactant, 0.1 to 5.0 percent of corrosion inhibitor, 0.1 to 5.0 percent of bactericide and the balance of water, wherein the gel breaker is prepared from 30 to 70 percent of gel breaker I and 30 to 70 percent of gel breaker II, the gel breaker I is one or more of ammonium persulfate, sodium thiosulfate, potassium periodate and potassium monopersulfate, and the gel breaker II is one or more of calcium peroxide, potassium peroxodisulfate, sodium periodate and iron sulfide. The thickened oil well polymer plugging remover is suitable for solving the plugging problem caused by a thickened oil well polymer, has a better plugging removal effect than a conventional single oxidizer or single acid liquor, and has the advantages of good plugging removal effect, strong corrosion resistance, long period of validity, safety and the like.

The invention relates to a method for removing chloro-olefin in water through strengthening activating calcium peroxide, for removing the chloro-olefin contaminant existed in the underground water by using the oxidation of the calcium peroxide (CaO2), and belongs to the technical field of environmental management. In the treating process, in the existence of the calcium peroxide, the ferric ion is added for activating the oxidizing agent, the citric acid is added for reinforcing the activation effect and then the chloro-olefin contaminant is oxidized. The method has the advantages that the calcium peroxide is used as a novel green oxidizing agent and has the characteristics of strong oxidizing ability, high stability and long oxidizing effect; by adopting the ferric ion and the citric acid, the calcium peroxide can be continuously and effectively activated and the timeliness of the oxidation can be increased; the pollution of the underground water caused by the chloro-olefin can be effectively green repaired and treated without intermediate product accumulation or secondary pollution.

The invention relates to a preparation method of an oxygen sustained release and phosphorus absorption material. The preparation method comprises the specific steps: (1) uniformly mixing iron-carrying particle biological charcoal, calcium peroxide particles, Portland cement and quartz sand to obtain a mixture for later use; (2) adding water into the mixture and stirring and mixing to carry out a hydration reaction for 8min-12min; (3) granulating materials subjected to the hydration reaction and carrying out air drying, sealing and preserving for later use; and (4) before engineering application, embedding the air-dried particles with calcium alginate and immediately taking out for use. The preparation method is simple and feasible; the oxygen sustained release and phosphorus absorption material prepared by the preparation method has long sustained release lasting time, good phosphorus absorption effect and low cost; and meanwhile, influences on an environment in a material utilization process are avoided. The oxygen sustained release and phosphorus absorption material can be used as a black and odorous water repairing material, an oxygen aeration and phosphorus absorption material of an aquaculture water region, compound ecological floating bed filler and ecological floating bed filler.

The invention discloses a preparation method and application of a self-activated persulfate oxidized medicament. The self-activated persulfate oxidized medicament is prepared from persulfate, an activator, an adhesive and a dispersant, wherein the molar ratio of persulfate and the activator is (0.5:1)-(5:1), and based on the weight of a mixture of persulfate and the activator, the addition of the adhesive is 10-15% and the addition of the dispersant is 1-5%. Persulfate and calcium peroxide mixed in a certain proportion and prilled and moulded are applied to repairing polluted water and sites, so that the medicament is self-activated without additionally adding the activator, thereby overcoming the problem that the medicament is non-uniform to mix, extremely simplifying the construction operation and improving the treatment efficiency.

The invention discloses a double crosslinked hydrogel based on calcium peroxide / polymer oxygen generating particles and a preparation method of the hydrogel. The hydrogel is characterized in that thecalcium peroxide / polymer composite particles are introduced into a sodium alginate dopamine solution, crosslinking points are formed by calcium ions and carboxyl groups of sodium alginate, crosslinking points are also formed by self-crosslinking of dopamine, a mass concentration of calcium chloride is 3 wt%, and a mass concentration of the polymer is 3-60 wt%; and the hydrogel is a double crosslinked injectable hydrogel. Sodium alginate is used as a skeleton of the polymer, is simply modified by dopamine, and then is mixed with the calcium peroxide / polymer oxygen generating particles to prepare the physicochemical double crosslinked injectable oxygen generating hydrogel in one step. A compressive strength of the double crosslinked hydrogel can be up to 247+ / -1.15 KPa; and the oxygen content inside the hydrogel is increased, and the inside of the hydrogel maintains a high oxygen environment for 4 days or more at 37 DEG C. In addition, the used materials of the prepared injectable oxygengenerating hydrogel are non-toxic or low-toxic.

The invention discloses composite bio-energizer used for in-situ ecological remediation of polluted river sediment. The composite bio-energizer comprises oxidant and bio-energizer. The oxidant is one or two of calcium peroxide or calcium nitrate. The bio-energizer comprises amino acid, micro-molecular organic acid, vitamin, inorganic salt and microelement. According to the characteristics of bottom sludge in a river, oxidant and bio-energizer compositions are obtained by screening, matching quality of the oxidant can be adjusted according to pollution level of the bottom sludge in the river, and ecological risk cannot be caused to the bottom sludge due to absence of microorganism. In addition, growth and reproduction of indigenous microorganism are achieved by stimulating the bottom sludge, a pollution-resistant bottom sludge micro-ecosystem is established, and remediation effect of the bottom sludge can be kept excellent for a long term. An experimental research shows that by the use of the composite bio-energizer, content of TOC (total organic carbon) in the bottom sludge can be reduced, and diversity and activity of microorganisms are increased.

The invention discloses a water quality improvement agent for aquaculture and a preparation method thereof. The water quality improvement agent is prepared from the following raw materials in percentage by weight: 5 percent to 10 percent of lactobacillus, 5 percent to 10 percent of photosynthetic bacteria, 5 percent to 10 percent of bacillus, 5 percent to 10 percent of brown sugar, 10 percent to 20 percent of activated carbon, 25 percent to 35 percent of zeolite powder, 3 percent to 5 percent of citric acid, 2 percent to 5 percent of sodium bicarbonate and 10 percent to 15 percent of calcium peroxide. According to the water quality improvement agent disclosed by the invention, organic matters in a water body of water for the aquaculture can be reduced, and the content of ammonia-nitrogen and nitrite is greatly reduced; the chemical oxygen consumption of pond bottom sludge is improved and oxygen debt of the pond bottom is alleviated; growth and proliferation of beneficial microorganismsand decomposition of organic pollutants are accelerated and the circulation of pond substances is accelerated; the proliferation of beneficial algae in a pond is accelerated so that the pond dissolved oxygen is increased; a culture water region environment is improved, healthy growth of aquatic animals is promoted, the feed coefficient is reduced and the economic benefits are increased.

The invention relates to a method for removing a polycyclic aromatic hydrocarbon methylnaphthalene substance by adopting double oxidants including persulfate and calcium peroxide. The method comprises the steps of adding persulfate and calcium peroxide into a water body containing methylnaphthalene, stirring uniformly, and reacting for 4-5 days under the condition that the pH of the system is neutral and weakly acidic, thus removing the pollutant by oxidization. The double oxidants are added into the water, and free hydroxy and sulfate radicals are generated to attack the pollutant, so that the pollutant is effectively degraded. The double oxidants including persulfate and calcium peroxide can simultaneously generate free hydroxy and sulfate radicals with extremely strong oxidation, so that the acting pollutant range is wider than that of a traditional method, and the pollutant sensitive to the free hydroxy and sulfate radicals can be simultaneously removed. The acting time is long, the applicable pH range is wide, a promotion effect on microbes in the environment is achieved, the bioremediation efficiency of microbes in environmental media can be improved, and then the repair efficiency of a polluted area is improved. The method is applicable in the field of polluted underground water repair.

The invention provides a biomass pellet fuel and a preparation method thereof. The biomass pellet fuel comprises the following components, by weight: herbivorous animal manure, agricultural waste, illegal cooking oil, calcium oxide, calcium sulfate, propionic acid, kaolin, diatomaceous earth, bentonite, calcium peroxide, aluminum hydroxide, propylene glycol, polyvinyl alcohol, an oxygenate, an antiknock agent, a combustion improver, and a bulking agent. The biomass pellet fuel has low water content and high lignin content. According to the invention, a large amount of agricultural waste and animal manure are utilized. Air pollution caused by the activities of burning agricultural waste is greatly reduced, and animal manure can be effectively treated, such that recycling application value is improved, and the fuel is more environment-friendly. Compared to conventional biomass pellet fuels, the biomass pellet fuel provided by the invention has the advantages of high combustion value, long combustion time, no harmful gas emission after combustion, and no corrosion to combustion equipment.

The invention discloses a remediation agent for soil polluted by heavy metals. The remediation agent comprises the following ingredients in parts by weight: 23.5-25.5 parts of attapulgite, 1.8-2.2 parts of polyamide, 2.4-2.6 parts of sodium humate, 6.2-6.8 parts of a metal chelating agent, 1.5-2.5 parts of biochar, 13.5-15.5 parts of nano-silicon dioxide, 3.5-4.5 parts of poly ferric chloride, 3.5-4.5 parts of peat and 3.2-3.8 parts of calcium peroxide. The invention further discloses a remediation method of the remediation agent for soil polluted by heavy metals. The remediation method includes the steps of placing the remediation agent in a nylon mesh bag with 15-25 meshes, burying the nylon mesh bag in soil with the depth of from 15-35 cm, and removing the bag from the soil after absorption and exchange. The remediation agent, which is obtained from the combination of attapulgite and various functional materials, applies to the remediation of soil polluted by heavy metals, has the advantage of simple and convenient remediation method, and is suitable for industrial production; heavy metals in the soil can be eliminated permanently through absorption and exchange; the purpose of remediation of the soil polluted by heavy metals is achieved; the leaching concentration, mobility and toxicity of heavy metals in soil are reduced.

The present invention provides systems and methods for in-situ remediation of soil and groundwater having contaminants such as but not limited to organic compounds perhaps providing adsorption, chemical oxidation, and even biodegradation of contaminants with novel treatments such as but not limited to mixtures of granular activated carbon, calcium peroxide, sodium persulfate, and nitrate perhaps in various concentrations.

The invention discloses a production method of calcium peroxide particles for slowly releasing oxygen. The production method of the calcium peroxide particles for slowly releasing the oxygen comprisesthe steps of using calcium peroxide powder as an oxygen releasing agent, using polylactic acid particles as an embedding medium, using dichloromethane as an intermediate medium for dissolving the polylactic acid particles, after the dissolved polylactic acid particles and the calcium peroxide powder are completely mixed, conducting volatilizing under a ventilation condition to remove the dichloromethane, placing an obtained mixture in a tubular mold after the mixture is in a gelatinous semi-solid state, and conducting extrusion molding and shearing balling to finally obtain the calcium peroxide particles for slowly releasing the oxygen after the dichloromethane is completely volatilized. By means of the production method of the calcium peroxide particles for slowly releasing the oxygen, the calcium peroxide powder and the polylactic acid particles can be completely mixed and embedded, the oxygen release speed of the calcium peroxide in water can be effectively controlled, and in the production process, loss, due to contact between the calcium peroxide and the water, of an oxygen releasing component is avoided. The produced calcium peroxide particles for slowly releasing the oxygencan slowly and continuously release the oxygen in the water, and meanwhile, due to the biodegradability of the PLA, no secondary pollution is generated during material use.

The invention discloses a modified lime sulphur and an application thereof in a gold leaching technology. The modified lime sulphur comprises a stabilizer sodium-hexametaphosphate, oxidants-calcium peroxide and potassium cyanate, and additives-lead nitrate and soluble bromides (such as sodium bromide, potassium bromide, calcium bromide and the like). The modified lime sulphur is used as a gold leaching agent so as to effectively recover gold from gold-containing ores, gold concentrate powder and gold-containing wastes. The modified lime sulphur has the characteristics that the modified lime sulphur is easy to synthesize; the preparation cost is low; the preparation process is environment-friendly and toxic-free; and when the prepared modified lime sulphur is used for gold leaching, the gold leaching technology is simple, and the gold leaching velocity is high; and moreover, the modified lime sulphur is suitable for more ores than cyaniding gold leaching.

The invention discloses composite microbial sustained release tablets for water treatment and a preparation method thereof. The preparation method comprises the following steps: preparing composite calcium peroxide particles, preparing composite microbial coating particles, and preparing the composite microbial sustained release tablets. The composite microbial sustained release tablets are prepared by adopting modes of coating, providing an oxygen source, preparing tablets, performing sustained release and the like. After the technology is adopted, the strain reservation time can be prolonged, the content of dissolved oxygen in a water body is improved, the strain survival rate is improved, microorganism reproduction and growth can be promoted, the using cost is saved, and the effect of purifying and improving the water quality is achieved.