82results about How to "Increase sedimentation rate" patented technology

The invention discloses a method for preparing ammonium metavanadate from a vanadium extraction leaching solution, comprising the following steps of: adjusting the pH value of the vanadium extraction leaching solution to 5-5.5 by using inorganic acid, then heating to the temperature of 30-40 DEG C, subsequently adding a soluble ammonium salt into the solution according to the mass ratio of NH4+:V=2.0-3.0, fully and uniformly stirring, and obtaining ammonium polyvanadate containing sodium after the reaction is finished; putting the obtained ammonium polyvanadate containing sodium into a sealed reactor, adding the soluble ammonium salt into the reactor according to the mol ratio of NH4+:V=3.0-5.0, slowly, uniformly stirring under the room temperature by controlling the pH value in the range of 7.5-8.5 and filtering the obtained solution after the reaction is finished to obtain an ammonium metavanadate solid.

The invention discloses a method for separating arsenic and selenium from copper anode slime alkaline leach liquor. The method comprises the following steps: 1) oxidation, namely adding an oxidizing agent or introducing oxidizing gas into the copper anode slime alkaline leach liquor, so that oxidized copper anode slime alkaline leach liquor is obtained; 2) arsenic precipitation, namely adding a calcium salt into the oxidized copper anode slime alkaline leach liquor, stirring the obtained mixture so as to produce a precipitate, and carrying out filtration and separation on the precipitate so as to obtain a calcium arsenate precipitate and arsenic post-precipitation liquid; and 3) selenium precipitation, namely adding a barium salt into the arsenic post-precipitation liquid obtained in the step 2), stirring the obtained mixture so as to produce a precipitate, carrying out filtration and separation on the precipitate so as to obtain a barium selenate precipitate and selenium post-precipitation liquid, and carrying out evaporative crystallization on the selenium post-precipitation liquid so as to recycle alkali, or directly returning to a leaching process. The method disclosed by the invention is short in technological process, less in equipment and simple in operation, and can be used for realizing the separation and enrichment of arsenic and selenium, the precipitation rate of arsenic is higher than 96%, and the precipitation rate of selenium is higher than 99%; by virtue of carrying out evaporative crystallization on a solution for recycling or directly returning the solution to a leaching process, the recovery of alkali is realized.

The invention discloses a method for treating waste liquid containing magnesium. The method comprises the following steps of: performing impurity removal and purification on waste liquid containing magnesium to obtain dregs and purified liquid; performing magnesium precipitating on the purified liquid by using ammonia or ammonium salt to obtain magnesium product precipitate and magnesium precipitation liquid; and adding ammonium phosphate into the magnesium precipitation liquid for precipitation and filtration to obtain magnesium ammonium phosphate precipitate and filtrate. According to the method for treating waste liquid containing magnesium, magnesium ions which do not participate in the reaction can be thoroughly precipitated to obtain the high-quality magnesium ammonium phosphate used as a slow release fertilizer as the magnesium precipitation liquid is further treated by adopting the ammonium phosphate, thereby the full utilization of magnesium in the waste liquid is realized. In addition, the full precipitation of the magnesium in the waste liquid can avoid the lower gypsum purity caused by the formation of magnesium hydroxide when the gypsum is produced by using the magnesium precipitation liquid. By utilizing the method, the precipitation ratio of the magnesium ion in the waste liquid containing magnesium can reach more than 99 percent; and the method has simple process, easy control and low cost.

The invention discloses a method for recycling tungsten and ammonia in one step from an ammonium paratungstate crystallization mother solution smelt through tungsten. After the ammonium paratungstate (APT) is subjected to evaporative crystallization, a mother solution is pumped into a reaction kettle for stripping treatment, calcium oxide with content above 90% or calcium hydroxide with content above 95% are added into the mother solution, a stripping process which is commonly used in the crystallization mother solution in the APT preparation process is utilized to recycle the ammonia, the reaction temperature is in a range from 25 DEG C to 90 DEG C, when the ammonia is subjected to gas-liquid separation through condensation concentration, the ammonia is sprayed with a hydrochloric acid to prepare ammonium chloride to return to a main process to prepare an analytical solution, white tungsten slag returns to a pressure boiling process, when a potential of hydrogen (pH) value of a reaction system is maintained in a range from 9 to 11 and concentration of ammonia nitrogen in water is reduced to about 30mg/L, the reaction is finished, and a waste liquid free of the ammonia nitrogen is subjected to a mixing treatment with an ion exchange post-liquid which is generated in the main process working procedure. The method has the advantages that the process procedures are greatly simplified, the tungsten deposition rate is high, the process is simple, the operation is easy, and the treating cost is slightly low.

The invention relates to a polyethylene glycol-microwave assisted almond protein extraction method, which adopts degreased almond powder as a raw material, and makes use of polyethylene glycol-microwave assisted extraction, isoelectric point-ethanol co-precipitation and vacuum freeze-drying to extract almond protein. Polyethylene glycol is a novel green solvent, has a solubilization effect on effective ingredients of almond protein, can improve the leaching efficiency and the extraction rate, and has no toxicity. Microwave-assisted extraction has the characteristics of high thermal efficiency, rapid and uniform temperature rising, greatly improved almond protein extraction efficiency, as well as shortened extraction time. Moreover, the almond protein has the advantages of high purity, high precipitation rate, simple extraction method, short extraction time, and environmental friendliness.

The invention discloses a process of extracting high-purity pectin from apple pomace, and relates to the technical field of pectin extraction. The process comprises the following steps: (1) rinsing for impurity removal; (2) powdering; (3) acid extraction; (4) decoloration; (5) concentration; (6) pectin settlement; (7) purification; (8) drying and powdering. According to the process, soluble sugarand part of pigments are removed from the apple pomace through rinsing operation; the apple pomace is granulated through the powdering operation to promote rapid leaching of the pectin during subsequent acid extraction; the pigments in a pectin extracting solution are effectively removed through the decoloration operation; by use of a pectin settling agent, the pectin settling rate and the pectinpurity are improved, so that the content of galacturonic acid in the prepared finished pectin is up to 85 percent or above, and the pectin extraction rate is up to 90 percent or above.

The invention discloses a method for comprehensively recovering valuable metals from low-grade tellurium slag, and aims to provide the method for comprehensively recovering the valuable metals from the low-grade tellurium slag. The method is characterized by comprising the following steps of: A, crushing and grinding the tellurium slag until the tellurium slag is below 80 meshes, stirring and leaching with a sulfuric acid and filtering to obtain sulfuric acid leach liquor and sulfuric acid leach residue; B, stirring and leaching the sulfuric acid leach residue obtained in the step A with a hydrochloric acid, cooling and filtering to obtain hydrochloric acid leach liquor and hydrochloric acid leach residue; C, stirring the hydrochloric acid leach liquor obtained in the step B, and adding alkali to precipitate tellurium and antimony so as to obtain liquor obtained after tellurium and antimony precipitation and tellurium and antimony slag; D, leaching the tellurium and antimony slag obtained in the step C with sodium hydroxide for 2 to 4 hours and filtering to obtain alkaline leach liquor and antimony slag; and E, adding the alkali into the liquor obtained after tellurium and antimony precipitation obtained in the step C to precipitate bismuth, settling and filtering to obtain bismuth chloride slag and recovering the bismuth. The method is mainly used for comprehensively recovering the valuable metals such as copper, bismuth, antimony, tellurium and the like from the low-grade tellurium slag.

The invention relates to a method for producing germanium concentrated ore from germanium-containing industrial liquor, and belongs to the technical field of nonferrous metallurgy. The method comprises that: a, a germanium complexing agent is added into the germanium-containing industrial liquor of which pH is 0.5 to 3, wherein the complexing agent is organic acid containing hydroxyl or carboxyl or/and salt of the organic acid, and the weight ratio of the complexing agent to the germanium is 3-10:1; b, an organic reagent of quaternary ammonium with an R4N structure or tertiary amine with an R3N structure is used as an extracting agent to extract the germanium in the liquor obtained in step a, wherein R is hydrocarbyl or alkyl or fatty group, N is organic ammonium salt, and the extracting agent accounts for 10 to 50 percent of the extracted liquor by volume; c, NaOH water solution or Na2CO3 water solution of which the concentration in percentage by weight is 5 to 30 percent is used for reversely extracting the germanium-containing organic phase obtained in step b; and d, the pH of the obtained reverse extracted liquor is adjusted to 8 to 12 by acid, then the liquor is dehydrated twice and filtered, and the sediment is dried to form the germanium concentrated ore. The method can produce the germanium concentrated ore from various germanium industrial liquors, the extracting agent and the complexing agent are easily obtained, the extracting and reverse extracting effects are good, and the yield of the germanium is high.

The invention discloses an impurity removing method of vanadium solution. The impurity removing method comprises steps as follows: a, adding an oxidant which is capable of respectively oxidizing Fe<2+> and V<4+> in the vanadium solution into Fe<3+> and V<5+> to the vanadium solution based on the contents of Fe<2+> and V<4+> in the vanadium solution, so as to remove impurities; b, adding a precipitating agent to the impurity-removed vanadium solution, and agitating so as to completely dissolve an impurity removing agent within 3 minutes; c, adjusting the pH (Potential Of Hydrogen) of the vanadium solution to reach 1.5-2.2 by virtue of sulfuric acid; d, heating the vanadium solution of which the pH is adjusted, and precipitating the vanadium solution for 60-150 minutes at 80-100 DEG C; and e, carrying out solid-liquid separation to the precipitated vanadium solution by virtue of common methods such as filtering, and then washing to obtain vanadate. With the adoption of the method disclosed by the invention, the impurity Fe2<+> which is disadvantageous for be precipitated can be removed from the vanadium solution, so that the precipitating rate in precipitating and producing process can be improved; and meanwhile, the tetravalent vanadium is reduced into pentavalent by virtue of the oxidant, so that the loss of the vanadium is decreased.

The invention discloses a method for selectively recovering heavy metals from electroplating sludge. The method particularly comprises the steps that: step (1), the electroplating sludge, ammonium chloride and water are mixed in proportions, then wet milled with a ball mill and then taken out for drying; step (2), a product obtained in step (1) is dissolved in water, filtered with suction, and washed with deionized water; step (3), a certain amount of 30% hydrogen peroxide is added to a solution obtained in step (2), the concentration of each heavy metal element is determined after standing for a period of time, and the extraction rate is calculated; step (4), a solution in step (3) is taken and adjusted by ultrasonic under 80W-120W conditions and is added a precipitation agent to adjust the pH, so that the heavy metals in the electroplating sludge are precipitated step by step in the form of hydroxides. The method efficiently extracts the heavy metal elements in the electroplating sludge through wet ball milling, and uses the ultrasonic-assisted-step precipitation method to recover several heavy metal elements in the form of precipitation.

The invention discloses a method for preparing lithium carbonate by using lithium aluminum-containing rock. The method comprises the following steps: S1) the lithium aluminum-containing rock and a sulfur phosphor mixed acid leaching agent are mixed, a mixture is leached, the mixture is filtered to obtain a lithium-containing leachate; S2) hydrogen peroxide is added, then the materials are continuously stirred, an ammonium hydroxide solution is added for adjusting the pH value, water is added for dilution, the material is filtered to obtain a lithium-containing purified solution; S3) the lithium-containing purified solution is subjected to evaporative concentration to form a hot saturated solution, the hot saturated solution is cooled for crystallization, and mixed crystals of ammonium sulfate and ammonium biphosphate can be precipitated to obtain a lithium-containing concentrate; and S4) finally magnesium chloride is added, the pH value is adjusted by gradually adding a sodium hydroxide solution, the materials are stirred and reacted under normal temperature, filtration is carried after the reaction is finished, and the material can be filtered to obtain a phosphate-removing filtrate. and S5) the phosphate-removing filtrate is heated for concentration, solid sodium carbonate is added, after the reaction is finished, filtration is carried out while hot, the hot water is used for washing the precipitates, and the precipitates are dried to obtain the lithium carbonate. The method employs a chemical precipitation method, ammoniacal liquor is taken as a precipitating agent, magnesium salt is taken as a phosphor precipitating agent, lithium and aluminium separation is realized, lithium and phosphor separation is realized, and the lithium carbonate can be finally prepared.

A method of comprehensively recovering rhenium and copper from copper smelting waste acid is disclosed. The method includes subjecting the copper smelting waste acid after being filtered to remove lead to targeted rhenium settling to obtain rhenium-rich slag, subjecting the rhenium-rich slag to hot-press oxidation leaching to obtain a rhenium-rich leachate, evaporating and concentrating to make the rhenium concentration 10-20 g/L, performing rhenium settling with KCl, and recrystallizing to obtain potassium perrhenate, and subjecting the liquid after rhenium settling to sulfuration copper settling. The objective of the method is to overcome complex processes, long treatment time, low recovery rates, and other disadvantages of processes recovering rhenium and copper from copper smelting waste acid through leaching at present, and to form a process which is low in investment, simple in operation, high in recovery rate, low in cost, low in pollution and convenient for industrial popularization and application, thus achieving high-value utilization of the rhenium resource in the copper smelting waste acid.

The invention discloses a sewage treatment agent for an oil production plant, belonging to the technical field of preparation of the sewage treatment agent. The sewage treatment agent for the oil production plant is prepared from the following raw materials in parts by weight: 40 to 80 parts of demulsifier, 30 to 60 parts of flocculant, 30 to 60 parts of foaming agent, 20 to 50 parts of flotation agent, 15 to 35 parts of fungicide, 10 to 20 parts of slow rot scale inhibitor, and 10 to 20 parts of deoxidant. The treatment agent provided by the invention for the oil production plant has the advantages of high deposition rate, good effluent quality, low treatment cost, no corrosive effect, nontoxicity, no pollution, safety in use, and the like; after oil production plant sewage is treated by adopting the treatment agent provided by the invention, the pH value basically reaches neutral pH, the SS removing rate can reach 99.09% to 99.27%, the COD removing rate can reach 99.02% to 99.11%, and the oil removing rate can reach 99.04% to 99.12%.

The invention relates to a treatment method for comprehensive resource recycling of dissipated metal germanium, in particular to a treatment method for carrying out precipitation recycling on germanium through metallic oxide. According to the treatment method, the metallic oxide is adopted as a neutral precipitation agent, a two-section neutralizing hydrolysis method is adopted, and the germanium is subjected to precipitation recycling from germanium containing material liquid. Compared with an existing germanium precipitation recycling process, the advantages of the method are remarkable, the metallic oxide is adopted as the neutral precipitation agent, and the two-section neutralizing hydrolysis method is adopted for treating germanium pre-precipitation liquid; operation is easy, the residue filtering performance is good, and the quantity of added auxiliary materials is small; and the total germanium precipitation rate can reach 98% or above, the grade of obtained germanium concentrates is about 6%-8%, and extraction and comprehensive recycling of the valuable metal germanium in the germanium containing material liquid can be achieved.

The invention discloses a method for low-cost dearsenification of copper smelting high-arsenic fume. The method comprises the following steps: A, performing neutral leaching on arsenic-containing fume, and after leaching is completed performing solid-liquid separation so as to obtain neutral leachate and natural leachate slag; B, performing primary normal-pressure alkali leaching on the natural leachate slag obtained in the step A, and after leaching is completed, performing solid-liquid separation so as to obtain primary leachate and primary leachate slag, wherein the final alkali concentration of the leachate is controlled to be less than 50g/L; C, performing secondary normal pressure alkali leaching on the primary leachate slag obtained in the step B, and after leaching is completed, performing solid-liquid separation so as to obtain secondary leachate and secondary leachate slag, wherein the NaOH concentration is 40-150g/L; D, performing rotational flow electrodeposition process copper removal by using the leachate obtained in the step A, wherein products are standard cathode copper and a copper removal after liquid; and E, performing lime causticization on the primary leachateobtained in the step B, and performing solid-liquid separation, thereby obtaining calcium arsenate and a causticization after liquid. The method is capable of low-cost high-efficiency dearsenification of c arsenic-containing fume and solving the influence of continuous increase of arsenic in copper concentrate to the copper smelting process, and has the advantages of environment protection, economy, energy conservation and resource utilization rates.