544 results about "Ammonium chloride" patented technology

The invention discloses a PAC-PDMDAAC compound coagulant, a corresponding preparation method and an application method. The PAC-PDMDAAC compound coagulant is prepared as the following steps: the PAC dry powder or solution is arranged in a mixing reactor, and water is added to obtain a PAC solution which is stirred under normal temperature and a PDMDAAC colloid is added into the solution; the mixed solution is stirred under normal temperature till the PDMDAAC colloid is completely dissolved to obtain a stable PAC-PDMDAAC. The application of the PAC-PDMDAAC compound coagulant is to adopt the PAC-PDMDAAC compound coagulant for the coagulation treatment to raw water and waste water and sewage and the dehydration treatment to sludge or silt directly or after dilution with water by any proportion. The component structure and content scope of the invention are distinct to guarantee the capability and stability of the obtained PAC-PDMDAAC compound coagulant, and the materials on industrial manufacturing are available. The various functions of the PAC-PDMDAAC compound coagulant can be adjusted during water treatment with high adaptability so as to reduce cost, reinforce coagulation effect and dramatically enhance the quality of obtained water.

A surface of an object may be treated using an antimicrobial wipe presoaked in an antimicrobial treatment solution. Alternatively, the antimicrobial treatment solution may be sprayed directly on the surface. The antimicrobial treatment solution may be made of isopropyl alcohol and an unreacted organofunctional silane antimicrobial substance that is substantially free from arsenic, silver, tin, heavy metals and polychlorinated phenols. The antimicrobial substance may include any one of: 3 trimethoxysilylpropyloctadecyldimethyl ammonium chloride; hyaluronan and its derivatives; triclosan; and a copolymer of chloropropyltrihydroxysilane and octadecylaminodimethyltrihydroxysilylpropyl ammonium chloride.

The invention discloses a method of detecting heavy metal lead, cadmium, arsenic and copper in a TCM (Traditional Chinese Medicine) tablet. The method comprises the following steps: after carrying out microwave alkaline hydrolysis on tablet powder with an ammonia chloride containing diluted alkali solution, quickly adding hydrogen peroxide containing dilute acid solution, and ultrasonically extracting after the pH value is adjusted to be not more than 2; carrying out constant volume on an extract after the centrifugation, condensation and microfiltration; and finally, determining by adopting an atomic absorbency method. According to the method, a sample is preprocessed by an alkaline-hydrolysis acid-extracting method, therefore, the loss of heavy metal element caused by high temperature of a dry ashing method and air pollution and potential danger caused by a resolution method can be prevented; meanwhile, the method has the advantages of being good in recovery rate, high in precision, fast in processing speed, convenient to operate, wide in range of application and the like, and is more suitable for the quantitative determination of trace metal elements.

The invention discloses a sandstone reservoir self-diverting acidizing method, which comprises the following steps of (1) injecting diverting acid into a sandstone reservoir to be used as ahead liquid; (2) injecting processing liquid into the sandstone reservoir; (3) injecting subsequent liquid into the sandstone reservoir; and (4) injecting displacing liquid into a pit shaft, and jacking acid liquid in the pit shaft into the deep path of the reservoir. The diverting acid is prepared from the following ingredients including 12 to 15 percent of HCl, 3 to 10 percent of diverting agents, 4 to 8 percent of additives and the balance water, wherein the diverting agents are erucyl amide hydroxysulfobetaine; the processing liquid is various kinds of conventional processing liquid suitable for sandstone acidizing; the subsequent liquid is prepared from the following ingredients including 5 to 15 percent of HCl, 1 to 2 percent of gel breakers, 4 to 8 percent of additives and the balance water; the displacing liquid is diesel oil, gasoline or 3-percent ammonium chloride solution. The percentage of the ingredients is mass percentage. The sandstone reservoir self-diverting acidizing method has the advantages that the uniform acid distribution effect of the acid liquid in the reservoir can be improved; the subsequent gel breaking residue is reduced; and the inhomogenous reservoir acidification is realized.

A visualized harmful gas removing agent is prepared from the porous carrier chosen from silica gel, molecular sieve, zeolite, alumina and calcium chloride in the form of powder, particle, or filtering paper, through treating it by potassium permanganate in alkalinecondition. It can capture, adsorb and eliminate volatile and reductive harmful gases. Its result can be shown by the color variation from red to brown.

The invention relates to a preparation method of a polyaluminum ferric chloride-poly dimethyl diallyl ammonium chloride (PAFC-PDMDAAC) inorganic / organic composite flocculant. The inorganic / organic composite flocculant is prepared by taking AlCl3.6H2O, FeCl3.6H2O, and PDMDAAC as raw materials and adopting a method of adding PDMDAAC into a PAFC system. The flocculant integrates the advantages of high molecular weight of PDMDAAC, high charge neutrality and adsorption bridging ability, wide application range, good flocculation effect and small generated sludge quantity, and high PAFC reaction velocity, large formed flocculating constituent, high settling velocity, wide applied pH (potential of hydrogen) range, good coagulation effect and the like. The PAFC-PDMDAAC inorganic / organic composite flocculant can be widely applied to the fields of water supply, waste water treatment, papermaking, oil extraction, textile printing and dyeing, mining, daily-use chemical industry and the like, and has a good water treatment effect.

A one-pot process for preparing ammonium and hydroxylammonium salts of bis 5,5′-tetrazole-1,1′-dihydroxide, specifically, diammonium bis 5,5′-tetrazole-1,1′-diolate (ABTOX) and dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50). The process requires the reaction of sodium azide, dichloroglyoxime, HCl in dioxane solution to form bis 5,5′-tetrazole-1,1′-dihydroxide and treating this product with either ammonium chloride to produce ABTOX or hydroxylamine hydrochloride to produce TKX-50.

The invention discloses total mixed pellet feed for meat sheep and a manufacturing method and application of the feed. The feed comprises: 20.00-40.00% of straw, 0.00-30.00% of caragana korshinskii, 0.00-30.00% of sunflower shells, 0.00-30.00% of leymus chinensis, 10.00-30.00% of corn, 5.00-10.00% of molasses, 5.00-8.00% of soybean meal, 0.00-10.00% of cottonseed meal, 0.00-5.00% of sesame meal, 0.00-15.00% of maize germ meal, 0.00-5.00% of rapeseed meal, 0.00-8.00% of corn bran with slurry, 0.00-3.00% of wheat bran, 0.00-5.00% of rice bran, 0.00-20.00% of corn distiller's dried grains with soluble, 0.00-3.00% of bentonite, 0.40-0.80% of salt, 0.10-0.50% of calcium hydrogen phosphate, 0.50-1.50% of stone flour, 0.00-0.80% of slow-release protein, 0.50-1.50% of sodium bicarbonate, 0.04-0.08% of a mildew inhibitor, 0.40-0.50% of ammonium chloride, 1.00-3.00% of Chinese herbal medicine premix and 0.80-1.50% of meet goat fattening premix. The feed can replace common refined feeding and roughage, the breeding process is simplified, the breeding cost is saved, and the total mixed pellet feed can prevent the occurrence of rumen acidosis and urinary calculus of meet sheep.

The present invention relates to a zeolites and a method for preparing thereof, in particularly a method for preparing a modification zeolite which can treat raw water and groundwater pollutated by chromates, and using as water processing material. The method belongs to the environmental-protecting technical field. The method includes steps as follows: firstly, processing activating to the natural zeolite by using a mixing solution of alcaine and citric acid for obtaining the activating zeolite; then processing modification to the zeolite by using surfactants cetyl bromination pyridine (HDPB) for obtaining the surfactants modification zeolite. The surfactants modification zeolite can be used for treating various raw water and ground water with substandard water quality which can remove chromates tainting substance with high efficient.

The invention specifically relates to arrayed silver nanorods with surface-modifying gold nanoparticles and a preparation method thereof, belonging to the field of nano-materials. The objective of the invention is to realize surface modification of a silver nanorod array prepared by using a physical evaporation coating process; the surfaces of silver nanorods are modified by polyelectrolyte (poly[diallyldimethylammonium chloride]) with positive electricity at first, then gold nanoparticles having a diameter of about 15 nm and synthesized by using a wet chemical process are used as a raw material which self-assembles on the surfaces of silver nanorods through electrostatic interaction, and thus, the silver nanorod array with surface-modifying gold nanoparticles is prepared. The technology of gold nanoparticle modification of the surfaces of silver nanorods brought forward in the invention has the advantages of safe and easy operation, mild conditions, low cost, etc. and enables gold nanoparticles to be uniformly fixed on the surfaces of silver nanorods so as to form a gold-silver composite structure.

The invention discloses a heavy oil thermal recovery fleeing proof agent comprising the following raw components by weight percent: sodium silicate 10-30%, ethyl acetate 0.5-3%, ammonium chloride 0.3-1.3%, aluminium citrate 0.005-0.015%, EDTA or EDTA salt 0.01-0 .03%, and the balance of water. The gelatinization time of the fleeing proof agent is 4-12 h. The gelatinized fleeing proof agent can resist steam with a temperature of 300 DEG C, can be used together with a suspended particle type fleeing proof agent, is used for performing deep fleeing prevent of a thermal recovery well with serious steam fleeing, and can enhance the fleeing proof effect. The fleeing proof agent can particularly be used for a heavy oil thermal-recovery sand-prevention well and can directly conduct fleeing prevention in the presence of a sand prevention layer or a sand prevention tool, thereby reducing the construction cost and achieving good effect.

The invention relates to a compounded cationic flocculant and a preparation method thereof. The flocculant is a cationic flocculant which is prepared from compounded dimethyl diallyl ammonia chloride as a main component and hydrophobic anionic copolymer. The hydrophobic anionic copolymer is used as a viscosity regulating agent and is added into a polydimethyl diallyl ammonia chloride solution; due to adoption of the anion and the hydrophobic groups, the interaction of the flocculant with organic matters in sewage is improved, and the performance of the flocculant is improved. The hydrophobic anion can form an amphoteric polymer with hydrophobic groups together with dimethyl diallyl ammonia chloride, so that a product is wide in application range and can be used in both acid and alkali mediums. The compounded cationic flocculant provided by the invention is a liquid, has the advantages of low production cost, high dissolution speed, environmental friendliness, energy conservation, consumption reduction, convenience in use and the like, is remarkable in decoloring chemical fiber sewage, is large and dense in floc and is high in sedimentation velocity.

The invention relates to a method for refining high purity cation integral dimethyl allyl amchlor. It uses chromatographic analysis method to assay determinate each volatile and non-volatile impurity substance component and the content of the cation integral solution, it adds cation integral solution in the tank and adds industry caustic soda solution to inactivating delivery the amine substance, it adds water so that the integral content of the solution is 35%~55%, it dose vacuum distillation on the two temperature ranges of the negative pressure, the vapor can be reclaimed by absorbing, the reacting liquid expels the expressed crystal NaCl after concavation or centrifugal filtration; it adds water into the filter liquid to adjust the integral content of the integral solution and adds a little of activated carbon to do decolouring treatment, it filters the activated carbon to obtain the cation integral product solution with little foreign substance and high purity.

The method of treating heavy alkali filtering liquid from alkali synthesizing production process includes evaporating ammonia to decompose NH4HCO3 and recover NH3 and CO2, adding MgO and evaporating ammonia to recover NH3, separating NaCl and returning to salt dissolving step, crystallizing magnesium chloride, hydrolyzing magnesium chloride to obtain MgO and HCl, reusing MgO while obtaining HCl. The present invention can raise the utilization rate of NaCl greatly, lower power consumption and cost.

The invention relates to a method for preparing manganous manganic oxide, belonging to the technical field of chemical production. The technical problem to be solved by the invention is to provide a method for preparing manganous manganic oxide with low production cost. The method comprises the following steps of a, adding manganous hydroxide and potassium permanganate in solvent, mixing the mixtures, and reacting the obtained slurry at 100-200 DEG C for 2-6 h, wherein the dosage of potassium permanganate is as 10-100 percent of a theoretical dosage through which the manganous hydroxide can be oxidized as the manganous manganic oxide; the solvent is mixed solution of ammonium chloride, ammonia and ethanol; the concentration of the NH4Cl in the mixed solution is 5-50 g / L; the concentration of the NH3 H2O in the mixed solution is 5-50 g / L; and the volume concentration of the ethanol in the mixed solution is 10-90 percent; b, cooling the reactant, filtering and washing the cooled reactant with ions for several times, and then filtering and washing the reactant with ethanol; and c, drying the product which is filtered and washed by step b to obtain the manganous manganic oxide.

The invention provides a method of increasing the content of esters in apple brandy. The method includes: adding a fermentation seed solution into apple juice, fermenting, distilling, storing, and the like. A nitrogen source and biotin are added into the apple juice before fermentation. The invention also provides apple brandy prepared by the method. The nitrogen source and the biotin are added into the apple juice so as to increase the growth and fermenting speeds of yeast, and therefore the yeast can grow better and produce more nutrient substances of metabolites used for fermentation, and more volatile components especially esters are produced in the fermentation process of the apple brandy, thus improving the quality of the apple brandy. The method is simple in process and practical. Only by addition of a small amount of ammonium chloride and the biotin, the content of the esters in the apple brandy is increased and the apple brandy with rich wine fragrance is obtained.

The invention discloses a high-slow release organic fertilizer for improving the micro-ecological structure of soil. The high-slow release organic fertilizer comprises raw materials, including urea, monoammonium phosphate, potassium fulvic acid, ammonium chloride, diammonium hydrogen phosphate, ferrous sulfate, zinc sulfate, ammonium molybdate, ammonium nitro complex, ammonium sulfate, vermiculite, lime powder, kaolin, sesame dregs, stannous chloride, sodium hydrogen sulfite, borax, silkworm excrement, cow dung, bean cakes, cottonseed meal, corn straw, rapeseed cakes, bagasse, oil cakes, EDTA (Ethylene Diamine Tetraacetic Acid) chelate, humic acid, EM (Effective Microorganisms) bacteria, amino acid chelate and a modified slow-release agent. The invention further discloses a preparation method of the high-slow release organic fertilizer for improving the micro-ecological structure of soil. The prepared high-slow release organic fertilizer has an excellent slow-release property, can provide rich nutrient substances for crops, can promote crop growth, and can increase the yield and improve the quality of the crops.

The invention discloses a high-temperature-resistant weak-gel type profile control agent and a preparation method thereof, and belongs to the field of chemical water plugging and profile control agents. The high-temperature-resistant weak-gel type profile control agent comprises the following components: partially-hydrolyzed polyacrylamide with a concentration of 0.8g / L-2.5g / L, modified phenol-formaldehyde resin with a concentration of 0.6 g / L-2.0 g / L, an auxiliary agent with a concentration of 0.5 g / L-2.0 g / L and water. Phenol is added into a reaction kettle and heated to 45-55 DEG C, an alkaline catalyst is added with stirring , the temperature is kept for 10-30 minutes, a formaldehyde solution is dropwise added, the mixture is rapidly heated to 70-90 DEG C, the temperature is kept for 3-5 hours, and finally urea is added, uniform mixing is conducted, and the temperature is kept for 10-30 minutes to obtain the modified phenol-formaldehyde resin, wherein the molar ratio of phenol to formaldehyde in the formaldehyde solution is1:(2.7-3.3), and the usage amount of the urea is 1-5% of the total mass of the phenol and the formaldehyde solution. Aluminum chloride is mixed with oxalic acid and then the mixture is dissolved in water, ammonium chloride is added, the obtained mixture is allowed to react under the condition that the pH value of the reaction system is 6-8 at a stirring state, and water is removed, so that the auxiliary agent is obtained, wherein the molar ratio of aluminum chloride to oxalic acid to ammonium chloride is 1: (15-30): (70-90). The high-temperature-resistant weak-gel type profile control agent can resist high temperature of 90-110 DEG C and is long in validity period.

A process for preparing high-alpha-phase silicon nitride powder by plasma chemical gas phase method includes such steps as quickly heating the gas to high temp by the plasma of DC arc, evaporating while heating SiCl4 and NH3 gases, quick decomposing and synthesizing reactions to generate Si3N4, crystallizing, growing cooling, gas-solid separation by cloth-bag collector, removing NH4Cl and high-temp phase change. Its advantages are high purity, high content of alpha phase, and fine granularity (nano class).

The invention discloses a preparation method of a catalyst for synthesizing diphenyl carbonate, and belongs to the technical field of catalyst synthesis. The catalyst is obtained by modifying a transition metal oxide by poly-electrolyte until the transition metal oxide is positively or negatively charged, and wrapping a layer of metal organic framework (MOFs) on the outer surface of the transition metal oxide by an electrostatic layer-by-layer self-assembling method, namely the oxide is used as a core, and the MOFs is used as a shell; the catalyst is MalphaObeta@MOFs fort short (M is one of transition metal elements, and alpha and beta are valences). The catalyst is enabled to react with ammonia chloride with a certain concentration to convert the core MalphaObeta into corresponding chloramine salt M(NH3)nClbeta (n is the number of ammonia molecules and is equal to 1 to 8); after ammonia is removed by low-temperature roasting, the catalyst MClbeta@MOFs is obtained. The catalyst can be used in a system for generating diphenyl carbonate by transesterification between urea or carbamic acid ester and phenol; new coordination adsorption is performed on the catalyst and ammonia generated by the reaction system to push the reaction to move rightwards; the yield of a diphenyl carbonate product is up to 90 percent or above; after the catalyst is used for 5 times, the catalysis effect is still good.

The invention discloses a method for continuous determination of calcium oxide and magnesium oxide content of limestone and dolomite. The method comprises adding a limestone or dolomite sample into a Teflon plastic beaker, preparing a blank contrast without the limestone or dolomite sample, respectively adding hydrochloric acid and nitric acid-hydrofluoric acid into the beakers to dissolve the sample, adding perchloric acid into the beakers to produce smoke, adding hydrochloric acid into the breakers, carrying out salt heating dissolution, transferring the reagents into a big volumetric flask, carrying out dilution until the liquid level reaches to the scale and metered volume is obtained, dividing each solution in the sample and blank contrast into two parts with the same amount, orderly adding appropriate amounts of triethanolamine, water, hydroxylamine hydrochloride, a potassium hydroxide solution and calcein into one part in the sample and blank contrast, carrying out titration by an EDTA standard solution until the fluorescent green color disappears, recording the volume, calculating calcium oxide content, orderly adding appropriate amounts of triethanolamine, water, hydroxylamine hydrochloride, an ammonia-ammonium chloride buffer solution and an eriochrome black T indicator into the other part in the sample and blank contrast, carrying out titration by an EDTA standard solution until the prunosus color is changed into a blue color, recording the volume and calculating magnesium oxide content.

The invention discloses a g-C3N4 / activated carbon compound photo-catalyst as well as a preparation method and application of the g-C3N4 / activated carbon compound photo-catalyst. Powdered activated carbon, urea and ammonia chloride are taken as raw materials, and the g-C3N4 / activated carbon compound photo-catalyst is prepared by grinding and temperature programmed treatment. The g-C3N4 / activated carbon compound photo-catalyst is good in dispersibility, high in catalytic activity, long in service life and cannot inactivate easily, and has a great potential application value in advanced treatment of organic polluted water.

The invention discloses a compound fertilizer capable of reducing cadmium lead content of vegetables in a slightly contaminated vegetable field and a preparation method thereof. The compound fertilizer is prepared from urea, ammonium chloride, ammonium nitrate, diammonium phosphate, a nitric phosphate potassium fertilizer, a calcium magnesium phosphate fertilizer, potassium chloride, sepiolite, kaolin, bentonite and power plant slag in a ratio. The preparation method for the compound fertilizer comprises the following steps of: A, preparing the sepiolite; B, preparing the kaolin; C, preparing the bentonite; D, preparing the power plant slag; and E, mixing the raw materials prepared in the steps A, B, C and D with the urea, the ammonium chloride, the ammonium nitrate, the diammonium phosphate, the nitric phosphate potassium fertilizer, the calcium magnesium phosphate fertilizer and the potassium chloride in the ratio, and performing production processing to prepare the compound fertilizer. The compound fertilizer is mainly characterized by comprising 36.5 to 43.5 percent of passivator which can effectively reduce active state cadmium lead content of soil and cadmium lead content of the vegetables, and 30 percent of nutrients of nitrogen, phosphorus and potassium, so that the active state cadmium and lead contents of the soil in the slightly contaminated vegetable field are reduced by 41.3 to 52.3 percent and 36.0 to 58.5 percent respectively, the cadmium content and the lead content of vegetable products are reduced by 30.1 to 52.8 percent and 27.9 to 51.0 percent respectively, and the compound fertilizer is suitable to be popularized and applied to many heavy metal contaminated areas.

This invention discloses a sustained-release nitrogen fertilizer containing secondary and trace elements. The sustained-release nitrogen fertilizer is composed of: urea 10-96 parts, ammonium sulfate 0.1-78.8 parts, attapulgite powder 0-8 parts, ammonium chloride 0.1-78.8 parts, magnesium sulfate 0.05-2.0 parts, borax 0.01-1 part, copper sulfate 0.01-0.2 part, manganese sulfate 0.01-0.6 part, ferrous sulfate 0.01-1 part, zinc sulfate 0.01-1 part, acetohydroxamic acid 0.01-0.02 part, composite amino acids 0.01-1 part, and dicyandiamide 0.01-0.2 part. The sustained-release nitrogen fertilizer is prepared by: mixing the above components, adding into a disc granulator, spraying an appropriate amount of water, granulating and drying. The sustained-release nitrogen fertilizer has such advantages as long effective period and high effective utilization rate (above 45%). Crops applied with the sustained-release nitrogen fertilizer have such advantages as high stress resistance and high yield.

The invention relates to the technical field of formaldehyde purification, in particular to a formaldehyde removing composition and a formaldehyde removing method. The formaldehyde removing composition comprises the following components by weight: 3-20 parts of a formaldehyde capture agent, 0.1-0.5 part of an adhesive agent, 0.2-1 part of a stabilizer, 10-30 parts of a cosolvent, and 80-120 partsof a solvent. Specifically, the formaldehyde capture agent is selected from one or more of ethylene urea, a hydrazide compound, ammonia water, glycine, ammonium chloride and chitosan.

The invention discloses a method for preparing adsorbent by using bottom mud of Dian Lake and application thereof, and belongs to the technical field of preparation of heavy metal adsorbents. The method comprises the following steps: soaking the bottom mud by distilled water, repeatedly washing and drying the bottom mud, adding a glutaraldehyde solution into the bottom mud to serve as an activator, adding the bottom mud into a polydimethyl diallylammonium chloride solution, putting in a water bath to carry out heating reflux, pouring the supernate and carrying out acidizing by hydrochloric acid, filtering and washing to neutral and drying to obtain initial samples, putting the samples in an electric furnace and carrying out high-temperature carbonization by taking vapor as protection gas, obtaining carbonized samples after cooling, repeatedly washing the samples to remove the impurities in the carbonized products until washing to neutral (pH>6.5), carrying out drying, grinding after cooling, and screening to obtain the samples according with adsorption. The method is simple in operation conditions, extremely high in adsorbent productivity; through combining the physical activation method and the chemical activation method, the activation effect is relatively good, the performance of the adsorbent is improved and the adsorption value of manganese is greater than 19mg / g.

The invention relates to a metal quaternary ammonium oxyphosphate dispersoid for developing the oil deposit of thickened oil to improve the exploitation rate of crude oil and application of the metal quaternary ammonium oxyphosphate dispersoid to the exploitation of the thickened oil. By the metal quaternary ammonium oxyphosphate dispersoid, the emulsification, catalytic viscosity reduction and dissolution in exothermic reaction of the thickened oil are realized. According to the technical scheme, the metal quaternary ammonium oxyphosphate dispersoid consists of quaternary ammonium cations and metal oxyphosphate anions. A preparation method comprises the following steps of: stirring an aqueous solution of Na2MoO4 or Na2WO4 or NaVO4 and a Na2HPO4 solution, heating, dripping concentrated hydrochloric acid for reacting, and extracting by using diethyl ether to prepare metal oxyphosphate; and adding alkyl trimethyl ammonium chloride, and stirring to prepare the metal quaternary ammonium oxyphosphate dispersoid. The thickened oil is heated to be melted, and metal quaternary ammonium oxyphosphate and hydrogen peroxide are added with stirring or air is introduced or peroxy-isobutane is added to perform reaction for 3 to 8 hours, so that the viscosity reduction of the thickened oil is realized under the condition of catalytic oxidation. The metal quaternary ammonium oxyphosphate has acatalytic effect, so that the thickened oil is subjected to the exothermic catalytic oxidation reaction under the action of an oxidant to reduce the viscosity and improve the exploitation rate.

The invention relates to a method for comprehensively utilizing low-grade magnesite, which comprises the following steps of: step 1) crushing the magnesite to react with hydrochloric acid to obtain acid leaching liquor and acid leaching residues; step 2) preparing iron oxide red; step 3) obtaining high-purity magnesium hydroxide; step 4) obtaining light calcium carbonate products; step 5) adding magnesium oxide into liquid after magnesium removal to conduct ammonia evaporation reaction and evaporation concentration; and step 6) decomposing the liquid after ammonia evaporation in a closed reactor to produce magnesium oxide and hydrochloric acid. In the invention, the magnesite is used to prepare the high-purity magnesium hydroxide and high-purity magnesium oxide and the hydrochloric acid is used to leach minerals, the leaching rate of the hydrochloric acid is higher than the leaching rate of sulfuric acid; and since ammonia and the hydrochloric acid in the technological process are prepared in situ and generated ammonia chloride is locally decomposed into the ammonia and the hydrochloric acid for cycle use, not only can the biggest advantage of the traditional brine-ammonia method which can be used for preparing the high-purity magnesium hydroxide be exerted, but also the transportation of the hydrochloric acid and the ammonia can be avoided, solid wastes are not produced and emitted and the method is an environment-friendly clean process.

This invention relates to a method for preparing KNO3 and NH4Cl taking KCl and NH4NO3 as the raw materials and applying a de-analyzing method, in which, in the mixed solution of KNO3 mother solution and NH4NO3, evaporation of water and crystallization of NH4Cl are finished in the process of evaporation and crystallization, the mixed solution is evaporated in a continuous evaporator under 100-120deg.C and evaporation pressure of 540-935mmHg.