46results about How to "Low Sulfate Content" patented technology

The invention discloses a manufacturing method of electron-grade nickel carbonate through sedimenting sodium carbonate, which is characterized by the following: adopting soluble nickel salt as nickel source and sodium carbonate as sediment; co-flowing nickel salt solution and sodium carbonate solution; controlling pH value, temperature and aging condition; washing; drying; washing again; drying again; grinding into product.

The invention relates to a method for processing laterite ore comprising nickel by means of microwave reduction roasting-hematite deposit transformation, which is characterized in that the method comprises the following steps: (1) a carbonaceous reducing agent is added into the laterite ore, and heated for 5min to 20min under microwave radiation after even blending so as to obtain laterite ore calcine; and (2) the laterite ore calcine is leached in a high-pressure container. The concentration of ore slurry leached is 10 percent to 30 percent, and the ore slurry is fed into oxygen-enriched air or pure oxygen to carry out oxidation leaching reaction. Nickel cobalt in the laterite ore enters the leached liquid, with iron transformed to hematite deposit. The method consumes less acid, with the leaching temperature greatly lower than that of the existing high-pressure acid leaching method, thereby being favorable to the decrease in manufacturing cost of leaching equipment; simultaneously, the scale in equipment is greatly decreased, the content of sulfate radical in the leaching residue is accordingly lowered, thus being favorable to the comprehensive utilization of the leaching residue.

The invention provides a method and a system for biologically treating acidic mine wastewater and simultaneously recovering iron ions. The method comprises the following steps: (1) carrying out biomineralization on the acidic mine wastewater by acidophilic iron-oxidizing bacteria, carrying out cyclic biological reduction treatment by acidophilic iron-reducing bacteria, introducing the wastewater into an alkali regulating tank, circularly regulating the pH value, and circulating an effluent to a biomineralization treatment unit for cyclic treatment; and (2) after reaction for a period of time,leading the wastewater out from the tail end of the water collecting tank and can be subsequently connected with a lime neutralization treatment system, and recycling jarosite minerals or schwertmannite minerals in the biological mineralization unit. The screened bacteria are indigenous strains existing in the actual mine environment and can be completely suitable for mine wastewater treatment. According to the invention, the precipitation amount of iron in the acid wastewater is increased by adopting circular treatment, and the mine wastewater can completely reach the standard by subsequentlyconnecting lime for neutralizing treatment.

The invention provides a method for preparing industrial-grade phosphoric acid by an emulsification, extraction and purification wet method. The method comprises the sequential process steps of primary de-coloring, emulsification and extraction, emulsification and washing, emulsification and reverse extraction, concentration, dearsenification and heavy metal removing, secondary deep de-coloring and concentration adjustment. A method for food-grade phosphoric acid by the emulsification, extraction and purification wet method comprises the sequential process steps of primary de-coloring, emulsification and extraction, emulsification and washing, emulsification and reverse extraction, concentration, dearsenification and heavy metal removing, secondary deep de-coloring, defluorination and concentration adjustment. The emulsification and extraction step comprises the following steps of: agitating at normal pressure and at a temperature of 50-60 DEG C for 10-60 seconds at the speed of 500-3000 r/min; and agitating at the normal pressure and at the temperature of 50-60 DEG C for 60-240 seconds at the speed of 120-220 r/min; the emulsification and washing step comprises the following steps of: agitating at the normal pressure and at the temperature of 50-60 DEG C for 10-60 seconds at the speed of 500-3000 r/min; and agitating at the normal pressure and at the temperature of 50-60 DEG C for 60-240 seconds at the speed of 120-220 r/min; and the emulsification and reverse extraction step comprises the following steps of: agitating at the normal pressure and at the temperature of 50-60 DEG C for 10-60 seconds at the speed of 500-3000 r/min; and agitating at the normal pressure and at the temperature of 50-60 DEG C for 60-240 seconds at the speed of 120-220 r/min.

The invention discloses a production process for extracting agar from ahnfeltia plicata. The production process is implemented by the following steps of: 1, washing and drying ahnfeltia plicata frond in the air; 2, soaking the frond by using alkali liquor; 3, filtering, and washing the frond with clean water; 4, adding distilled water into the frond and performing primary colloid extraction underincreased pressure; 5, filtering a mixed liquor to obtain filtrate and filter residue; 6, adding activated carbon into the filtrate for decoloring while hot; 7, filtering while hot, cooling the filtrate to obtain a colloid, and treating the colloid to form primary agar; 8, adding the alkali liquor into the frond, namely the filtrate residue, and performing secondary colloid extraction under the increased pressure; 9, filtering the secondarily extracted-mixed solution to obtain the filtrate and the filtrate residue; and 10, cooling the filtrate to obtain the colloid; and treating the colloid to obtain secondary agar. The agar extracted from the ahnfeltia plicata has various good performance indicators; a low-alkali pressurization process is utilized; the method is simple and easy to implement; the utilization value of the ahnfeltia plicata is improved; and good economic benefit is expected to obtain.

The invention discloses a production method of natural-color anti-rusting body paper. The production method comprises the following steps: (1) mixing natural-color sulfate softwood pulp with sulfite wood pulp, adding pure water, and carrying out pulping; (2) sequentially blending the pulp by virtue of a pulp storage tower, a transition tank, a pre-papermaking tank and a high-level tank, mixing theblended pulp with white water, removing residues by virtue of a sand filter and a sucking-moving roll, and finally, conveying the pulp to a flow pulp tank; (3) uniformly distributing the pulp to a net by virtue of the flow pulp tank, dehydrating by virtue of a net part, so as to obtain a wet paper blank; (4) sucking and moving the wet paper blank to coarse cotton cloth by virtue of the sucking-moving roll, and carrying out three squeezing dehydration processes, so as to obtain wet paper; (5) introducing the wet paper to a drying part by virtue of a paper introducing rope, drying, and introducing the wet paper to a reeling part, discharging the wet paper from the roll while reaching a specified roll diameter after parameters are qualified; and (6) re-reeling the wet paper into a specifiedspecification by virtue of a re-reeling machine after discharging. The natural-color anti-rusting body paper produced by virtue of the production method is high in yield, low in energy consumption, good in water-absorbing quality, high in strength, stable in moisture and uniform in thickness.

A method for extracting lithium sulfate from lepidolite is disclosed. The method adopts the lepidolite as a raw material and a roasting manner, and includes steps of crushing, material mixing, dryingand roasting stabilizer adding, and the like. The raw material and auxiliary materials are mixed, and the mixture is roasted in a rotary kiln device to achieve lithium sulfate extraction. During lepidolite roasting, a recovered by-product salt is added in place of potassium sulfate, a roasting additive that is ferric oxide powder is added during roasting so that the ferric oxide powder reacts andis bonded with silica in the lepidolite raw material, a stabilizer function is achieved, and a raw material phenomenon and an inner kiln blockage phenomenon are avoided, thus increasing utilization rates of lithium and lithium salts such as lithium sulfate extracted from the lepidolite. The production process is simple.

According to circulating economic principle, sulphur pollution problem in coal gangue can be solved by using alkalescence of waste fly ash. A columnar eluviation method is adopted to resolve the sulphur pollution problem of the coal gangue and reduce pollution to soil and water body caused by coal gangue sulfuration through a different proportion process of the fly ash and the coal gangue. Leachate PH value can be increased, leachate salt ion concentration and sulphur emersion quantity can be reduced efficiently by proportion treatment in such a way that: based on the same volume, the coal gangue with different particle diameter matches with fly ash to form two layers (20cm coal gangue, and 20cm fly ash disposed on lower layer), and to form four layers(the coal gangue and the fly ash are spaced with each other to form 4 layers, each of which has thickness of 10cm, and the fly ash is disposed on the lowest layer). According to the sulphur pollution control effect, the two layers proportion 20cm thickness fly ash treatment is superior to four layers proportion 10cm thickness fly ash treatment, and contribution rate of the fly ash for controlling sulphur pollution of the leachate can reach 64%, which shows that the fly ash has better application potential for treating sulphur pollution problem of coal gangue.

The invention discloses a method for continuously producing 2-keto-L-gulonic acid methyl ester by taking 2-keto-L-gulonic acid as a raw material. A plurality of heat exchangers are connected in seriesto form a feeding heat exchanger; the back of the feeding heat exchanger is connected to a tubular reactor to form an esterification reaction device; a material outlet of the tubular reactor is connected to a thermal medium inlet of a primary heat exchanger formed by combining the first M heat exchangers of the feeding heat exchanger; a thermal medium outlet of the primary heat exchanger of the feeding heat exchanger is used as a discharging port of equipment for producing the 2-keto-L-gulonic acid methyl ester; and a secondary heat exchanger formed by combining the last N heat exchangers ofthe feeding heat exchanger adopts an external heat source. The production method comprises the following steps: blending, heating and continuous esterifying. The method has the beneficial effects that: the reaction time is remarkably shortened, the energy consumption is reduced, the workload of workers is reduced, the use amount of sulfuric acid is remarkably reduced, byproducts are reduced, the product quality is further improved, the use amount of conversion reaction alkali can be further reduced, the production cost can be further reduced, and the like.

The invention relates to a method for preparing agarose. The method comprises the following steps: cleaning gracilaria, and carrying out alkali treatment, acidification treatment, bleaching treatment,gelatin boiling, filtration, cooling and solidification to obtain colloid; stirring and crushing the colloid; and adding water into the crushed colloid, heating, adjusting the pH value, adding an H2O2 solution for reaction, filtering, washing and repeatedly washing until no H2O2 is left in the colloidal particle sample and the pH value of the washing liquid is 7 after the reaction is finished, and freezing, dehydrating, drying and crushing the sample to obtain the agarose. According to the method, the content of sulfuric acid groups of agar can be remarkably reduced, the gel strength is improved, the electroendosmosis is remarkably reduced, the commercially available agarose index requirement is met, the reaction time is short, and the method is environmentally friendly.

The invention relates to a power plant circulating cooling water waste water treatment method and system, the method comprises the steps that sodium aluminate and a calcareous material are added to waste water, and the sodium aluminate and the calcareous material are in complexation with sulfate radicals in the waste water to produce sulfate precipitate; the clear liquid obtained through complexation is subjected to former stage film filtration treatment; the fresh water obtained after former stage film filtration treatment is subjected to aeration treatment, and calcium ions and aluminium ions dissolved in the fresh water are promoted to form calcium carbonate precipitate and aluminium hydroxide precipitate respectively; the fresh water obtained after aeration treatment is subjected to later stage film filtration treatment, and at least residual sulfate radicals are retained. According to the power plant circulating cooling water waste water treatment method and system, a manner of combining the chemical reaction and the physical action is adopted, the high concentration sulfate radicals in the circulating cooling water waste water can be selectively removed, the content of the sulfate radicals in the circulating cooling water waste water is effectively reduced, and the method and the system have the advantages of high efficiency and high pertinency; the quality of the treatedwaste water is excellent, the waste water can be reused in a plurality of links of the production technology, and the reuse rate of the circulating cooling water is improved remarkably.

The invention discloses a treatment method of cellulose ethanol waste water. The treatment method of the cellulose ethanol waste water comprises the following steps: pretreating the cellulose ethanolwaste water, performing the two-phase anaerobic-aerobic comprehensive treatment and electrochemical oxidation further treatment. By adopting the treatment method of the cellulose ethanol waste water,the COD value, the ammonium and nitrogen content and the sulfate content of the cellulose ethanol waste water can be greatly reduced, the content of side reaction products such as furan rings, furfural, formic acid, levulinic acid and the like, solids such as cellulose, lignin, semi-cellulose and the like as well as inorganic salts in the in the cellulose ethanol waste water can be reduced to be alevel not influencing the long-time operation and successful implementation of the waste water biochemical treatment system, the operation cost is low, the design is ingenious, and easy in maintenance can be achieved.

The invention belongs to the technical field of nutritional health-care products, and particularly relates to application of novel red algae starch. The invention relates to application of red algae starch in rapidly improving the glycemic index of a hypoglycemic patient. The sulfate radical content of the red algae starch is lower than 0.1%, the red algae starch is mainly linked by alpha-glucosidic bonds, and the average molecular weight is 1kDa-6KDa. Compared with rice starch, the red algae starch can improve the glycemic index more quickly and has the effects of improving the immunity of the human body and the like, so that the red algae starch is a relatively ideal functional food for patients with hypoglycemia.

The invention relates to a method for preparing agarose. The method comprises the following steps of: cleaning gracilaria, and carrying out alkali treatment, acidification treatment, bleaching treatment, colloid boiling, filtration, cooling and solidification to obtain colloid; stirring and crushing the colloid; and adding water into the crushed colloid, heating, adjusting the pH value, slowly dropwise adding a maleic anhydride ethanol solution for reaction, performing filtering after finishing the reaction, alternately washing the colloidal particle sample by using absolute ethyl alcohol anddeionized water, repeatedly washing the sample until the pH value of the washing solution is neutral, and freezing, dehydrating, drying and crushing the colloidal particle sample to obtain agarose. According to the method, the content of sulfuric acid groups of agar can be remarkably reduced, the jelly strength is improved, the electroendosmosis is remarkably reduced, the index requirements of thecommercially available agarose is met, the reaction time is short, and the method is environmentally friendly.