CN110817912A - Process for directly treating and utilizing hydrogen chloride gas - Google Patents
Process for directly treating and utilizing hydrogen chloride gas Download PDFInfo
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- CN110817912A CN110817912A CN201911299295.6A CN201911299295A CN110817912A CN 110817912 A CN110817912 A CN 110817912A CN 201911299295 A CN201911299295 A CN 201911299295A CN 110817912 A CN110817912 A CN 110817912A
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- reaction tower
- active metal
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- hydrogen chloride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/26—Magnesium halides
- C01F5/30—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/28—Chlorides by chlorination of alkaline-earth metal compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/30—Concentrating; Dehydrating; Preventing the adsorption of moisture or caking
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/32—Purification
Abstract
The invention relates to a process for directly treating and utilizing hydrogen chloride gas, which comprises the following steps: s01, preparing an absorption solution in advance, adding active metal oxide and water into a stirring tank, preparing the active metal oxide with the mass fraction of 10 percent of the added water into the absorption solution S02, and reacting to recover hydrogen chloride gas; s03 the active metal chloride solution is processed into the active metal chloride liquid; s04, drying the active metal chloride solid on a fluidized bed to obtain water and chloride. The hydrogen chloride gas is directly absorbed and is treated by simple equipment and reaction technology to form hydrochloric acid, and the hydrochloric acid is used for reaction to produce general chemicals with certain economic value, so that the by-product hydrochloric acid is not needed to be managed and treated as a dangerous chemical production enterprise, a series of other problems caused by hydrochloric acid expansion are avoided, and the by-product can create certain economic value.
Description
Technical Field
The invention relates to the technical field of hydrogen chloride gas treatment and utilization, in particular to a process for directly treating and utilizing hydrogen chloride gas.
Background
In chemical production, due to the particularity of processes and raw materials, hydrogen chloride (HCl) gas is generated in the production process of many enterprises, and the original traditional thinking is that HCl gas is mostly absorbed by water to generate a byproduct, namely hydrochloric acid, for sale.
The hydrochloric acid is in a liquid state, so that the transportation and storage are inconvenient, the risk is high, the national requirements and management on safe production are stricter in recent years, a plurality of industrial and trade enterprises and general chemical product production enterprises are forced to be brought into dangerous chemical product production enterprises due to the byproduct hydrochloric acid, so that a plurality of enterprises need to obtain production licenses of dangerous chemicals and easily manufactured toxic products, downstream customers of the enterprises need to have the operating and using licenses of the dangerous chemicals and easily manufactured toxic chemicals, the hydrochloric acid is extremely difficult to sell due to the reasons, the hydrochloric acid expands a warehouse, the overall production of the enterprises is severely restricted, and the problem of selling the byproduct hydrochloric acid at a reduced price or even reversed price is caused.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a process for directly treating and utilizing hydrogen chloride gas.
The technical scheme adopted by the invention for solving the technical problems is as follows: a process for directly treating and utilizing hydrogen chloride gas comprises the following steps:
s01 preparing absorbing solution in advance
Adding active metal oxide and water into a stirring tank, and preparing an absorption solution, wherein the active metal oxide accounts for 10% of the mass of the added water;
s02 reaction for recovering hydrogen chloride gas
Putting the absorption solution into a reaction tower, introducing hydrogen chloride gas into the reaction tower, detecting the pH value and the solution clarification speed in the reaction tower in real time, supplementing active metal oxide powder or the carbonate powder of the active metal into the reactor, adjusting the pH value, and obtaining the active metal chloride solution reaching the reaction end point when the liquid in the reaction tower is relatively clarified;
the S03 active metal chloride solution is primarily processed into the active metal chloride liquid
Neutralizing the active metal chloride solution and lime water, introducing the neutralized solution into a plate-and-frame filter press, performing filter pressing to obtain a relatively pure active metal chloride solution, storing the solution in a storage tank, evaporating and concentrating the active metal chloride solution, adding the concentrated solution into a flaker, and cooling and flaking to obtain an active metal chloride solid;
s04, drying the active metal chloride solid on a fluidized bed to obtain water and chloride.
Specifically, the reaction tower adopts a combination mode of bubbling absorption, gas-liquid phase countercurrent exchange and falling film absorption, so that the absorption of hydrogen chloride gas and the reaction of hydrochloric acid and alkaline solution are simultaneously carried out in the same reaction tower.
Specifically, the active metal oxide is preferably one of calcium oxide and magnesium oxide.
Specifically, in step S02, the reaction tower includes a # 1 reaction tower and a # 2 reaction tower, the # 1 reaction tower introduces an active metal hydroxide solution into the # 1 reaction tower, a gas nozzle is communicated with a gas source, hydrogen chloride gas is sprayed upwards from a gas nozzle below to react with the active metal hydroxide solution, a mixed liquid after a preliminary reaction is cooled by a # 1 tubular heat exchanger and is sprayed from a spray device at the top of the # 1 reaction tower under the pressure of a water pump to realize bubbling absorption and gas-liquid phase countercurrent exchange absorption, the mixed liquid in the # 1 reaction tower after the preliminary reaction is introduced into the # 2 reaction tower, meanwhile, unreacted hydrogen chloride gas in the # 1 reaction tower is communicated with the gas nozzle at the bottom of the # 2 reaction tower, hydrogen chloride gas overflowing from the # 1 reaction tower continues to react in the # 2 reaction tower, and after the reaction in the # 2 reaction tower, and pressurizing part of the mixed solution by a water pump, spraying the part of the mixed solution from a top spraying system of the 2# reaction tower, further reacting with residual hydrogen chloride gas, re-introducing part of the mixed solution into the 1# reaction tower for reaction, and discharging the part of the mixed solution from the 1# reaction tower after cyclic reaction until the reaction solution meets the requirement.
Specifically, when the active metal oxide is calcium oxide, calcium carbonate is added in step S02 to adjust the PH value to 5-6, so that the density of the liquid in the reaction tower is 1.30-1.36.
Specifically, when the active metal oxide is calcium oxide, before the filter pressing in step S03, neutralizing the active metal chloride solution a, transferring the calcium chloride solution reaching the reaction end point in step S02 from the reaction tower to a PH neutralization tank, dropwise adding hydrochloric acid or calcium hydroxide to adjust the PH of the calcium chloride solution to 7, and simultaneously precipitating iron ions and magnesium ions in the solution to obtain a neutralized calcium chloride solution, and then performing filter pressing.
Specifically, when the active metal oxide is calcium oxide, the concentration of the calcium chloride after filter pressing in step S03 is 33 to 37%.
Specifically, when the active metal oxide is calcium oxide, the step S03 is performed with evaporation concentration to obtain a 65-70% calcium chloride concentrated solution, the calcium chloride concentrated solution is added into a flaker for cooling and flaking, and then the calcium chloride dihydrate is obtained after drying.
Specifically, when the active metal oxide is magnesium oxide, in step S02, powdered magnesium oxide is added into the reactor until the PH is 3 to 4, the amount of the added magnesium oxide powder is 25 to 35% of the volume of the total liquid in the reaction tower, and the optimal amount of the added magnesium oxide powder is 30%.
Specifically, when the active metal oxide is magnesium oxide, the step S03 is performed with evaporation concentration to obtain a 45% magnesium chloride concentrated solution, and the magnesium chloride concentrated solution is added into a flaker for cooling and flaking, and then dried to obtain magnesium chloride hexahydrate.
The invention has the following beneficial effects: the hydrogen chloride gas is directly absorbed and is treated by simple equipment and reaction technology to form hydrochloric acid, and the hydrochloric acid is used for reaction to produce general chemicals with certain economic value, so that the by-product hydrochloric acid is not needed to be managed and treated as a dangerous chemical production enterprise, a series of other problems caused by hydrochloric acid expansion are avoided, and the by-product can create certain economic value.
Drawings
FIG. 1 is a process flow diagram of example 1 of the present invention.
FIG. 2 is a pipeline flow diagram of a reversing tower according to example 1 of the present invention.
FIG. 3 is a process flow diagram of example 2 of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
Example 1
The process for directly treating and utilizing the hydrogen chloride gas as shown in figures 1 and 2 comprises the following steps:
s01 calcium hydroxide solution prepared in advance
Adding lime powder and water into a dilute lime stirring tank, wherein the lime powder accounts for 10% of the mass of the water, and forming a calcium hydroxide solution;
s02 reaction for recovering hydrogen chloride gas
Putting a calcium hydroxide solution into a reaction tower, introducing hydrogen chloride gas into the reaction tower, detecting the pH value and the solution clarification speed in the reaction tower in real time, adding solid calcium carbonate into the reactor until the pH value is 5-6 and the liquid density is 1.34-1.36, and obtaining a calcium chloride solution A reaching the reaction end point when the liquid in the reaction tower is relatively clear;
s03 neutralizing calcium chloride liquid A
Transferring the calcium chloride solution A reaching the reaction end point from the reaction tower to a PH neutralization tank, adjusting the pH of the calcium chloride solution to 7 by dropwise adding hydrochloric acid or calcium hydroxide, and simultaneously precipitating iron ions and magnesium ions in the solution to obtain a neutralized calcium chloride solution B;
the S04 calcium chloride solution is processed into calcium chloride
Introducing the neutralized calcium chloride solution into a plate-and-frame filter press, and performing filter pressing to obtain a relatively pure calcium chloride solution C, wherein the concentration of calcium chloride is 33-37%, storing the calcium chloride solution C in a storage tank, evaporating the calcium chloride solution C by an evaporator to obtain a calcium chloride solution D with the concentration of 65-70%, and adding a flaking machine to perform cooling flaking to obtain calcium chloride with the content of 70%;
s05 the calcium chloride tablets were dried in a fluidized bed to give 74% calcium chloride dihydrate.
Specifically, the HCl gas does not show other acidity and corrosivity in a dry gaseous state, so that absorption of the HCl gas and reaction of hydrochloric acid and calcium hydroxide are performed simultaneously in the same reaction tower by improving a combination mode of bubbling absorption, gas-liquid phase countercurrent exchange and falling film absorption on the basis of the conventional HCl falling film absorption, the device used in this embodiment comprises a stirring tank, a reaction tower, a neutralization tank, a filter press, a storage tank, an evaporator, a sheeting apparatus and a fluidized bed which are connected in sequence, the reaction tower comprises a reaction tower 1 and a reaction tower 2, cooling jackets are arranged outside the reaction tower 1 and the reaction tower 2, a gas nozzle is arranged at the bottom of the reaction tower, the reaction tower 1 is communicated with the stirring tank, the reaction tower 1 is communicated with a tubular heat exchanger 1 through a pipeline, the tubular heat exchanger 1 is respectively communicated with a spraying device at the top of the reaction tower 1 through a water pump, 2# reaction tower is linked together, and 2# reaction tower is linked together through pipeline and 2# tubulation heat exchanger, and 2# tubulation heat exchanger is linked together through spray set, the 1# reaction tower at water pump respectively with 2# reaction tower top, and 1# reaction tower top is passed through the trachea and is linked to each other with the gas nozzle of 2# reaction tower bottom, and its reaction process is: the 1# reaction tower is used for introducing a calcium hydroxide solution into the 1# reaction tower, a gas nozzle is communicated with a gas source, hydrogen chloride gas is upwards sprayed from a gas nozzle below and is mutually reacted with the calcium hydroxide solution, mixed liquid after preliminary reaction is cooled through a 1# tubular heat exchanger and then is sprayed down from a spraying device at the top of the 1# reaction tower through water pump pressurization, bubbling absorption and gas-liquid phase countercurrent exchange absorption are realized, the mixed liquid in the 1# reaction tower after preliminary reaction is introduced into a 2# reaction tower, meanwhile, unreacted hydrogen chloride gas in the 1# reaction tower is communicated with a gas nozzle at the bottom of the 2# reaction tower, hydrogen chloride gas overflowing from the 1# reaction tower continuously reacts in the 2# reaction tower, and after the reaction in the 2# reaction tower, partial mixed solution is sprayed down from a spraying system at the top of the 2# reaction tower through the water pump pressurization and further reacts with residual hydrogen chloride gas, and part of the mixed liquid enters the No. 1 reaction tower again for reaction, and is discharged from the No. 1 reaction tower after the cyclic reaction until the reaction liquid meets the requirement.
Example 2
The process for directly treating and utilizing the hydrogen chloride gas as shown in FIG. 3 comprises the following steps:
s01 magnesium hydroxide solution prepared in advance
Adding magnesium oxide and water into a stirring tank, wherein the magnesium oxide accounts for 10% of the water by mass and forms a magnesium hydroxide suspension;
s02 reaction for recovering hydrogen chloride gas
Putting the magnesium hydroxide suspension into a reaction tower, introducing hydrogen chloride gas into the reaction tower, detecting the pH value and the solution clarification speed in the reaction tower in real time, supplementing powdery magnesium oxide into the reactor until the pH value is between 3 and 4, pouring the magnesium oxide powder into the reaction tower when the magnesium oxide powder is 30 percent of the volume of the total liquid in the reaction tower and the liquid is relatively clarified, and discharging the magnesium chloride solution A;
the S03 calcium chloride solution is primarily processed into magnesium chloride
Performing filter pressing on the magnesium chloride solution A through a plate-and-frame filter press to obtain a relatively pure magnesium chloride solution B, storing the magnesium chloride solution B after filter pressing in a storage pool, and then evaporating the magnesium chloride solution to a magnesium chloride solution C with the concentration of 45% through an evaporator;
and S04, cooling the magnesium chloride solution C, and sheeting to obtain magnesium chloride hexahydrate.
Specifically, the apparatus used in this embodiment includes a stirring tank, a reaction tower, a filter press, a storage tank, an evaporator, a flaker and a fluidized bed, which are connected in sequence, the reaction tower includes a # 1 reaction tower and a # 2 reaction tower, cooling jackets are arranged outside the # 1 reaction tower and the # 2 reaction tower, a gas nozzle is arranged at the bottom of the reaction tower, the # 1 reaction tower is communicated with the stirring tank, the # 1 reaction tower is communicated with a # 1 tubular heat exchanger through a pipeline, the # 1 tubular heat exchanger is respectively communicated with a spray device at the top of the # 1 reaction tower and the # 2 reaction tower through a water pump, the # 2 reaction tower is communicated with a # 2 tubular heat exchanger through a pipeline, the # 2 tubular heat exchanger is respectively communicated with the spray device at the top of the # 2 reaction tower and the # 1 reaction tower through a water pump, the top of the # 1 reaction tower is connected with the gas nozzle at the bottom of the # 2, the reaction process is as follows: the reaction tower No. 1 is characterized in that calcium hydroxide solution is introduced into the reaction tower No. 1, a gas nozzle is communicated with a gas source, HCl gas is upwards sprayed from a dotted line part below and mutually reacts with magnesium hydroxide solution, mixed liquid after preliminary reaction passes through a tubular heat exchanger No. 1 and is sprayed from a spraying device at the top of the reaction tower No. 1 under the pressurization of a water pump, bubbling absorption and gas-liquid phase countercurrent exchange absorption are realized, the mixed liquid in the reaction tower No. 1 after preliminary reaction is introduced into a reaction tower No. 2 and further continuously reacts with hydrogen chloride gas overflowing from the reaction tower No. 1, after reaction in the reaction tower No. 2, part of the mixed liquid is sprayed from a spraying system at the top of the reaction tower No. 2 under the pressurization of the water pump and further reacts with residual hydrogen chloride gas, part of the mixed liquid enters the reaction tower No. 1 again for reaction, and after circular reaction, the reaction liquid reaches the requirement, discharging from the No. 1 reaction tower.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the protection scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (10)
1. A process for directly treating and utilizing hydrogen chloride gas is characterized in that: the method comprises the following steps:
s01 preparing absorbing solution in advance
Adding active metal oxide and water into a stirring tank, and preparing an absorption solution, wherein the active metal oxide accounts for 10% of the mass of the added water;
s02 reaction for recovering hydrogen chloride gas
Putting the absorption solution into a reaction tower, introducing hydrogen chloride gas into the reaction tower, detecting the pH value and the solution clarification speed in the reaction tower in real time, supplementing active metal oxide powder or the carbonate powder of the active metal into the reactor, adjusting the pH value, and obtaining the active metal chloride solution reaching the reaction end point when the liquid in the reaction tower is relatively clarified;
the S03 active metal chloride solution is primarily processed into the active metal chloride liquid
Neutralizing the active metal chloride solution and lime water, introducing the neutralized solution into a plate-and-frame filter press, performing filter pressing to obtain a relatively pure active metal chloride solution, storing the solution in a storage tank, evaporating and concentrating the active metal chloride solution, adding the concentrated solution into a flaker, and cooling and flaking to obtain an active metal chloride solid;
s04, drying the active metal chloride solid on a fluidized bed to obtain water and chloride.
2. The process for directly treating and utilizing hydrogen chloride gas as claimed in claim 1, wherein: the reaction tower adopts a combination mode of bubbling absorption, gas-liquid phase countercurrent exchange and falling film absorption, so that the absorption of hydrogen chloride gas and the reaction of hydrochloric acid and alkaline solution are simultaneously carried out in the same reaction tower.
3. The process for directly treating and utilizing hydrogen chloride gas as claimed in claim 1, wherein: the active metal oxide is preferably one of calcium oxide and magnesium oxide.
4. The process for directly treating and utilizing hydrogen chloride gas as claimed in claim 1, wherein: in the step S02, the reaction tower includes a # 1 reaction tower and a # 2 reaction tower, the # 1 reaction tower introduces the active metal hydroxide solution into the # 1 reaction tower, the gas nozzle is communicated with the gas source, the hydrogen chloride gas is sprayed upwards from the gas nozzle below to react with the active metal hydroxide solution, the mixed liquid after the preliminary reaction is cooled by the # 1 tubular heat exchanger and is sprayed down from the spray device at the top of the # 1 reaction tower by the pressurization of the water pump to realize bubbling absorption and gas-liquid phase countercurrent exchange absorption, the mixed liquid in the # 1 reaction tower after the preliminary reaction is introduced into the # 2 reaction tower, meanwhile, the unreacted hydrogen chloride gas in the # 1 reaction tower is communicated with the gas nozzle at the bottom of the # 2 reaction tower, the hydrogen chloride gas overflowing from the # 1 reaction tower continues to react in the # 2 reaction tower, and pressurizing part of the mixed solution by a water pump, spraying the part of the mixed solution from a top spraying system of the 2# reaction tower, further reacting with residual hydrogen chloride gas, re-introducing part of the mixed solution into the 1# reaction tower for reaction, and discharging the part of the mixed solution from the 1# reaction tower after cyclic reaction until the reaction solution meets the requirement.
5. The process for the direct treatment and utilization of hydrogen chloride gas according to claim 1, 2, 3 or 4, characterized in that: when the active metal oxide is calcium oxide, calcium carbonate is added in the step S02 to adjust the pH value to be 5-6, so that the density of the liquid in the reaction tower is 1.30-1.36.
6. The process for the direct treatment and utilization of hydrogen chloride gas according to claim 1, 2, 3 or 4, characterized in that: when the active metal oxide is calcium oxide, neutralizing the active metal chloride solution a before the filter pressing in the step S03, transferring the calcium chloride solution reaching the reaction end point in the step S02 from the reaction tower to a PH neutralization tank, dropwise adding hydrochloric acid or calcium hydroxide to adjust the PH of the calcium chloride solution to 7, and simultaneously precipitating iron ions and magnesium ions in the solution to obtain a neutralized calcium chloride solution, and then performing filter pressing.
7. The process for the direct treatment and utilization of hydrogen chloride gas according to claim 1, 2, 3 or 4, characterized in that: when the active metal oxide is calcium oxide, the concentration of the calcium chloride after filter pressing in the step S03 is 33-37%.
8. The process for the direct treatment and utilization of hydrogen chloride gas according to claim 1, 2, 3 or 4, characterized in that: when the active metal oxide is calcium oxide, the step S03 is carried out evaporation concentration to obtain 65-70% calcium chloride concentrated solution, a flaker is added for cooling and flaking, and then the calcium chloride dihydrate is obtained after drying.
9. The process for the direct treatment and utilization of hydrogen chloride gas according to claim 1, 2, 3 or 4, characterized in that: when the active metal oxide is magnesium oxide, in step S02, powdered magnesium oxide is added into the reactor until the PH is 3-4, the amount of magnesium oxide powder added is 25-35% of the total volume of the liquid in the reaction tower, and the optimal amount of magnesium oxide powder added is 30%.
10. The process for the direct treatment and utilization of hydrogen chloride gas according to claim 1, 2, 3 or 4, characterized in that: when the active metal oxide is magnesium oxide, evaporating and concentrating the active metal oxide in the step S03 to obtain a magnesium chloride concentrated solution with the concentration of 45%, adding a flaker for cooling and flaking, and then drying to obtain magnesium chloride hexahydrate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911299295.6A CN110817912A (en) | 2019-12-17 | 2019-12-17 | Process for directly treating and utilizing hydrogen chloride gas |
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| CN201911299295.6A CN110817912A (en) | 2019-12-17 | 2019-12-17 | Process for directly treating and utilizing hydrogen chloride gas |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111253780A (en) * | 2020-03-31 | 2020-06-09 | 江西势通钙业有限公司 | Transparent nano calcium carbonate for high-grade ink and preparation method and device thereof |
| CN112225242A (en) * | 2020-09-10 | 2021-01-15 | 杭州逐真科技有限公司 | Resourceful treatment device and process for mother liquor generated by reaction of waste incineration fly ash and hydrochloric acid |
| CN112501456A (en) * | 2020-12-15 | 2021-03-16 | 武汉工程大学 | Method for reducing magnesium-lithium ratio of salt lake brine by using magnesium oxide |
| CN113264546A (en) * | 2021-05-18 | 2021-08-17 | 聊城鲁西氯苄化工有限公司 | Process and system for producing industrial calcium chloride solution by using byproduct acid and application of process and system |
-
2019
- 2019-12-17 CN CN201911299295.6A patent/CN110817912A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111253780A (en) * | 2020-03-31 | 2020-06-09 | 江西势通钙业有限公司 | Transparent nano calcium carbonate for high-grade ink and preparation method and device thereof |
| CN112225242A (en) * | 2020-09-10 | 2021-01-15 | 杭州逐真科技有限公司 | Resourceful treatment device and process for mother liquor generated by reaction of waste incineration fly ash and hydrochloric acid |
| CN112501456A (en) * | 2020-12-15 | 2021-03-16 | 武汉工程大学 | Method for reducing magnesium-lithium ratio of salt lake brine by using magnesium oxide |
| CN113264546A (en) * | 2021-05-18 | 2021-08-17 | 聊城鲁西氯苄化工有限公司 | Process and system for producing industrial calcium chloride solution by using byproduct acid and application of process and system |
| CN113264546B (en) * | 2021-05-18 | 2023-02-21 | 鲁西化工集团股份有限公司氯碱化工分公司 | Process and system for producing industrial calcium chloride solution by using byproduct acid and application of process and system |
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