57results about How to "Small fluctuations in concentration" patented technology

A lead sulfide ore concentrate continuous smelting method and equipment thereof are provided. The invention relates to a pyrometallurgical process of lead sulfide ore concentrate and the equipment adopted for realizing the process. In the device, a partition wall is arranged in the space above the liquid slag layer of the molten pool of the furnace body, which separates the device into three regions of an oxidation region, a reduction region and a fuming region that are not communicated. The top of every region is equipped with a flue gas outlet and is respectively equipped with a spray gun. A material smelting inlet is arranged on the top part of the oxidation region. A siphon discharging outlet is arranged on a crude lead layer on the bottom of the furnace body. A slag discharging outlet is arranged on the liquid slag layer of the fuming region. The smelting materials are continuously fed in the furnace from the top of the oxidation region. The liquid metal lead is continuously discharged out of the furnace from the siphon discharging outlet. SO2 obtained in the oxidation area is used for preparing sulfate acid. Valuable metal smoke dust such as high zinc that is obtained in the fuming region is reused. The invention has the advantages of short process line, fully utilization of slag heat, obvious energy saving effect, less investment in the metallurgical furnace equipment, low activity-based cost, small concentration fluctuation of SO2, cheap reducing agent and wide resources.

The invention belongs to the technical field of aluminum electrolysis cells, and particularly relates to a continuous feeding device for an aluminum electrolysis cell and an electrolysis cell with the same. The continuous feeding device for the aluminum electrolysis cell is capable of improving the stability of the electrolysis cell, lowering energy consumption, reducing sediment and pressure drop at the furnace bottom and prolonging the service life of the cell. According to the technical scheme, the continuous feeding device for the aluminum electrolysis cell comprises a sleeve, a funnel and an upper delivery pipe, wherein the open end of the funnel is fixedly connected with the bottom of the sleeve; and the outlet end of the funnel is fixedly connected with one end of the upper delivery pipe. Since the funnel is arranged at the bottom of the sleeve, so that the flow velocity of fed materials can be reduced, continuous feeding is realized, and the problem caused when alumina powder which is not completely dissolved sinks into the aluminum liquid is avoided.

The present invention provides a tamsulosin hydrochloride sustained-release capsule. The tamsulosin hydrochloride sustained-release capsule of the present invention can avoid the sudden release of the drug tablets and the performance differences generated from the gastric emptying differences, display minor food effect or do not display food effect, and obtain the stable curve of the plasma drug concentration and longer action time simultaneously, so as to reduce the occurrence of cardiovascular side effects, greatly improve the safety, effectiveness and compliance of the medication for the patients. The tamsulosin hydrochloride sustained-release capsule of the present invention can ensure the sustained and regular release of the main ingredient tamsulosin hydrochloride after the oral administration, and the present invention is characterized by convenient administration, durable function, stable efficacy, fewer side effects and so on.

The invention discloses a production method for producing cement and sulfuric acid by using phosphogypsum. The method comprises the following steps: carrying out pretreatment purification on phosphogypsum to reduce insoluble phosphorus, water-soluble phosphorus impurities and most free water in the phosphogypsum, kneading with a reducing agent, granulating, and directly feeding the material into a reductive decomposition integrated rotary kiln with fluidization preheating function; controlling a gas phase atmosphere to perform step-by-step heating, drying, dehydration and reductive decomposition under the combustion of the pulverized coal; sulfur dioxide gas generated after reductive decomposition is used for producing sulfuric acid after being subjected to dust removal and purification; and the reduced and decomposed material enters an oxidation calcining kiln for cement clinker sintering, and the gas-phase atmosphere is controlled under the combustion of pulverized coal for heating, mineralizing and sintering to obtain the cement clinker. Compared with the prior art, the production method for producing cement and co-producing sulfuric acid by using phosphogypsum has the advantages that the coal consumption for reduction and firing is reduced, the production efficiency and the product quality are improved, the device investment is saved, the economic benefit of producers is increased, and the environmental protection problem of phosphogypsum stacking treatment is eliminated.

The invention discloses a method for recovery and reusing of etching liquid containing copper ions and nitrate, and belongs to the technical field of etching liquid recovery. The method comprises thefollowing steps that a high-concentration copper-containing solution and a low-concentration copper-containing solution are obtained from the etching liquid through an electrodialysis device, the high-concentration copper-containing solution enters a copper extraction tank to be subjected to circulating electrolysis, thus the copper ions are reduced to generate copper elementary substances, the copper elementary substances are deposited on a copper electrode serving as a cathode, the cathode serves as an anode in a refining tank, thus the anode in the refining tank is dissolved out on the cathode, and a copper plate is obtained; electrolyte, with the low copper ion concentration, obtained in the copper extraction tank and the low-concentration copper-containing solution generated in the electrodialysis device are subjected to swirling flow electrolysis, and thus a copper pipe and/or copper powder are/is obtained; and concentrated nitric acid is added into clear liquid, and thus the etching liquid is recycled. If the etching liquid contains nickel ions, after electrolysis is completed, lye is added to adjust pH, and thus the nickel ions are precipitated. Copper recycled through themethod is high in economic value, a chemical agent is not put, and secondary pollution is avoided; and the etching liquid is regenerated and recycled, and resources are maximally utilized.

The invention relates to a lipid prodrug of a drug containing guanidino and pharmacosome thereof. The lipid prodrug is a medicinal compound which is in covalent union with long-chain fatty acid with a single chain or double chains and contains guanidino. The pharmacosome is formed in such a way that the lipid prodrug disperses freely in a proper medium, is orderly arranged into a single-layer or double-layer structure, and is automatically assembled finally. The pharmacosome has biological targeting property, can effectively enhance the bioavailability of the drug and opens up a novel concept for solving the problems of poor transmembrane capability, low bioavailability and the like of a water soluble drug.

The invention discloses an SNCR denitration control method and device for a circulating fluidized bed unit and a storage medium. The method comprises the following steps: S1, oxygen amount control: designing an oxygen amount control model prediction controller by taking the total air amount of secondary air as a control variable, the total coal amount as an interference variable and the oxygen content in flue gas as a controlled variable, and controlling the opening degree of a baffle door of a secondary air fan according to an output result of the oxygen amount control model prediction controller; and S2, denitration control: designing a denitration control model prediction controller by taking the total ammonia spraying amount as a control variable, taking the NOx concentration of the clean flue gas as a controlled variable and taking the oxygen content in the flue gas as an interference variable, and controlling the opening degree of an ammonia spraying valve according to an outputresult of the denitration control model prediction controller. The fluctuation range of the NOx generation amount under the variable load working condition can be reduced through oxygen amount controloptimization, oxygen amount measuring points serve as feedforward control through denitration control optimization, the delay time of a control system can be shortened, and the ammonia spraying amount can be saved through combination of the oxygen amount control optimization and the denitration control optimization.

The invention discloses continuous aluminum oxide feeding equipment which comprises a material box, a feeding air cylinder, a fixed container, a crust breaking head, a material passing frame, an oblique plate, a buffer and a feeding pipe. The feeding pipe is led to the bottom of the crust breaking head. The continuous aluminum oxide feeding equipment further comprises an air pipe which is arranged at a buffer outlet and used for blowing air to the buffer outlet. Compared with the prior art, the continuous aluminum oxide feeding equipment has the beneficial effects that (1) aluminum oxide is made to enter an electrolyte slowly, and the temperature fluctuation of an electrolytic cell and the concentration fluctuation of the aluminum oxide are reduced, so that the current efficiency is improved, and energy consumption is reduced; (2) the aluminum oxide is made to have enough time to be melted into the electrolyte, so that sediment at the furnace bottom is reduced, the pressure drop at the furnace bottom is reduced, and energy consumption is reduced; (3) the aluminum oxide is made to enter the electrolyte slowly through a pipeline, and the crust breaking head is prevented from being impacted so that the aluminum oxide can be prevented from being dispersed, the actual amount of materials entering the electrolytic cell is increased, and the effect coefficient is decreased; and (4) large particles in the aluminum oxide are blown away through the gas reverse blowing principle, so that blockage is eliminated, and the hole blockage phenomenon can be effectively prevented.

The invention discloses an optimal control method based on an oxidation-reduction potential and used for the liquid zinc purification and copper removal process. Firstly, a relational model of the oxidation-reduction potential (ORP) and the copper ion concentration and a zinc powder adding amount control model are established and subjected to parameter identification; secondly, during zinc powder adding control, field liquid zinc flow, the ion concentration at a reactor inlet and ORP data are collected and compared with data used for parameter identification, and adjusting instructions are determined according to the comparison result; and thirdly, the zinc powder adding amount is determined according to relevant control rules according to the sent adjusting instructions, so that adding of zinc powder is controlled.

The invention discloses a full-automatic high-efficiency filter leakage detection system, which is composed of an aerosol generation system, a particle counter detection system, a full-automatic sampling system and a control system, wherein the full-automatic sampling system can realize accurate positioning and improves the reproducibility of a detection result, the control system can realize effective monitoring for the whole device, and the particle counter detection system improves the accuracy and the sensitivity of detection. The whole device has the characteristics of high automation degree, high precision and accuracy and good reproducibility.

The invention belongs to the technical field of medicines, and particularly relates to a paliperidone gastric retention tablet and a preparation method thereof. The paliperidone gastric retention tablet is prepared from the following raw material components in parts by weight: 2-3 parts of paliperidone, 10-15 parts of glyceryl monostearate, 20-30 parts of lecithin, 1-2 parts of a surfactant, 10-15 parts of hydroxypropyl methyl cellulose, 10-15 parts of polyoxyethylene, 24-30 parts of a filling agent, 8-12 parts of a foaming agent, 0.5-1 part of a floating aid and 0.1-0.5 part of a flow aid. According to the paliperidone gastric retention tablet, through the synergistic effect of all the components, the medicine floats and is retained in gastric juice, the retention time of the paliperidone medicine in the gastric juice is prolonged, the medicine is slowly released, the release time of the medicine in the digestive tract is prolonged, absorption is enhanced, blood concentration fluctuation is reduced, and therefore the bioavailability is improved.

The invention discloses production equipment for preparing a semiconductor film on a tubular base. The production equipment adopts a single-slot multi-tube manner, heated liquid flows into the inner wall of the tubular base so as to heat the tubular base from inner side to heat a reaction solution through the tubular base, the reaction solution can exist in a normal temperature status and does not affect the growth of the semiconductor film, and the reaction can be carried out preferably on the outer wall of the tubular base so as to save the solution; high temperature heating liquid provided by an independent constant high-temperature heating box is taken as a heat source, so that the temperature of semiconductor film deposition is stable, and high repeatability of the semiconductor film deposition is realized; a manner of combination of an overflow structure and interior heating of the tubular base is also adopted; and the solution is updated at real time by adopting a reaction solution overflow circulatory system, the effect of concentration reduction on a reaction process at a later period is reduced, the waste liquor emission load is lowered, and the solution injection volume is reduced. The production equipment is applicable to industrial mass production of semiconductor films deposited on various tubular bases.

The invention discloses a recombined human coagulation factor FVII-Fc fusion protein, a preparation method thereof and applications thereof. The fusion protein successively comprises, from the N end to the C end, human FVII, a flexible peptide joint and an IgG2Fc mutant. The Fc mutant has no lysis property and exhibits very low bad Fc-mediated side effect. The fusion protein has similar or higher bioactivity than the human FVII, and prolonged the serum half time, thus improving pharmacokinetics and efficacy.