川东达州地区地下卤水75 ℃等温蒸发析盐规律研究

doi:10.19964/j.issn.1006-4990.2021-0103

Abstract

Abstract:

Abundant underground brine resources are in the Dazhou area of eastern Sichuan,with reserves of about 8.23×10⁸ m³,which are rich in sodium,potassium,lithium,boron,rubidium,bromine and other elements.The change of pH,the en-richment regularity and salting out law during the process of isothermal evaporation at 75 ℃ of the brine was investigated in the experiment.The types of precipitated salts were detected by XRD,and the precipitation order of salts was determined.Ex-perimental research results showed that the solution pH decreased with increasing loss rate.Sodium chloride largely precipi-tated in the whole evaporation process.Potassium began to largely precipitate as potassium chloride when the evaporation rate reached 77.3%.When the evaporation was near the end,both calcium and boron were partially analyzed.The order of appear-ance of the salt was：sodium chloride→sodium chloride+potassium chloride→sodium chloride+potassium chloride+boric acid.The law of evaporation was the same as the phase diagram of K⁺,Na⁺,Mg²⁺//Cl^--H₂O（75 ℃）.Preliminary design of the process route for the utilization of brine resources was based on the evaporation experiment data.The research results provided reliable basic data for the development and comprehensive utilization of underground brine in eastern Sichuan.

Key words: underground brine, isothermal evaporation, enrichment law, process route

CLC Number:

TS351

PENG Yang,FENG Zhenhua,CHENG Ziyi,ZHOU Kun. Study on salting-out law of the underground brine in Dazhou area,East Sichuan through isothermal evaporation at 75 ℃[J]. Inorganic Chemicals Industry, 2021, 53(12): 100-104.

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References 19

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化学成分	质量浓度/（mg·L^-1）	化学成分	质量浓度/（mg·L^-1）
Na⁺	102 312	Rb⁺	28
K⁺	23 533	B₂O₃	3 840
Ca²⁺	4 981	Cl^-	186 401
Mg²⁺	1 821	Br^-	1 540
Li⁺	264

编号	蒸失率/ %	密度/ （g·cm^-3）	pH	各组分质量浓度/（mg·L^-1）									相图指数/%
编号	蒸失率/ %	密度/ （g·cm^-3）	pH	Na⁺	K⁺	Ca²⁺	Mg²⁺	Li⁺	Rb⁺	B₂O₃	Cl^-	Br^-	KCl	NaCl	MgCl₂
L0	—	1.223 5	6.64	102 312	23 533	4 981	1 821	264	28	3 840	186 401	1 540	83.41	14.32	2.27
L1	15.8	1.322 7	6.45	92 460	25 834	5 499	2 048	302	29	4 115	172 498	1 634	80.47	16.80	2.73
L2	26.2	1.344 5	6.40	91 468	27 123	5 971	2 157	330	32	4 399	174 358	1 852	79.51	17.61	2.88
L3	36.3	1.292 8	6.18	88 228	33 571	7 183	2 833	410	34	5 618	177 300	2 088	74.99	21.32	3.69
L4	44.6	1.367 7	6.14	82 011	33 876	7 136	2 851	421	40	5 711	167 968	2 270	73.42	22.66	3.92
L5	52.1	1.274 2	6.01	74 206	40 132	8 161	3 284	495	45	6 649	163 168	2 542	67.94	27.45	4.61
L6	59.0	1.341 0	5.84	72 553	47 646	9 451	4 060	598	51	7 906	169 746	2 838	63.43	31.12	5.45
L7	62.4	1.393 2	5.79	75 926	51 224	10 284	4 312	646	57	8 554	179 322	2 997	62.85	31.68	5.47
L8	65.0	1.375 5	5.73	69 974	54 292	10 741	4 501	684	59	9 051	173 613	3 312	59.58	34.54	5.88
L9	68.2	1.402 4	5.61	70 238	61 971	12 288	5 281	795	71	10 457	183 538	3 668	56.35	37.15	6.50
L10	71.2	1.423 0	5.49	62 725	67 460	13 353	5 712	869	75	11 372	178 520	4 213	51.46	41.35	7.19
L11	74.0	1.427 9	5.38	58 704	74 206	14 808	6 380	970	84	12 695	180 734	4 540	47.37	44.73	7.90
L12	77.3	1.451 0	5.08	54 914	76 786	18 056	8 069	1 195	92	15 864	182 613	5 448	44.05	46.02	9.93
L13	80.4	1.454 0	4.86	48 829	73 082	19 187	8 730	1 272	101	17 094	171 832	5 993	41.80	46.74	11.46
L14	84.4	1.416 0	4.20	37 507	67 659	28 214	13 029	1 910	114	26 214	163 790	7 446	34.71	46.78	18.51
L15	88.1	1.423 5	3.57	29 683	60 611	37 294	17 540	2 101	141	40 437	160 028	12 803	29.13	44.45	26.42
L16	90.9	1.542 9	1.82	10 929	39 794	64 238	31 516	4 092	198	59 183	156 719	18 687	12.28	33.40	54.32

编号	蒸失率/%	各组分质量分数/%
编号	蒸失率/%	Na⁺	K⁺	Ca²⁺	Mg²⁺	Li⁺	B₂O₃	Cl^-	Rb⁺
S1	15.8	36.88	0.713	0.203	0.066	0.012	0.223	57.851	0.001
S2	26.2	37.97	0.739	0.273	0.067	0.016	0.245	59.620	0.001
S3	36.3	36.27	0.767	0.303	0.071	0.019	0.280	57.368	0.002
S4	44.6	36.92	0.778	0.345	0.076	0.022	0.312	58.537	0.001
S5	52.1	37.40	1.007	0.377	0.086	0.026	0.353	59.104	0.001
S6	59.0	36.83	1.151	0.415	0.090	0.030	0.376	58.593	0.001
S7	62.4	36.49	1.193	0.454	0.091	0.035	0.425	57.814	0.002
S8	65.0	36.80	1.219	0.514	0.105	0.039	0.452	58.520	0.002
S9	68.2	36.35	1.327	0.564	0.107	0.043	0.494	57.556	0.001
S10	71.2	37.17	1.437	0.630	0.120	0.047	0.544	59.113	0.002
S11	74.0	35.17	6.969	0.641	0.129	0.049	0.561	58.393	0.002
S12	77.3	18.29	28.75	0.681	0.131	0.053	0.591	54.347	0.006
S13	80.4	22.57	22.56	0.791	0.154	0.055	0.660	54.761	0.007
S14	84.4	19.37	25.05	0.817	0.292	0.059	3.084	52.947	0.012
S15	88.1	15.80	29.16	0.958	0.384	0.087	5.443	52.348	0.016
S16	90.9	13.26	22.68	3.146	1.252	0.234	13.452	45.755	0.030

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Inorganic Acid-Base-Salt Committee of CIESC

Study on salting-out law of the underground brine in Dazhou area,East Sichuan through isothermal evaporation at 75 ℃

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