地下原生高钠光卤石矿冷分解结晶工艺研究

doi:10.19964/j.issn.1006-4990.2023-0048

Abstract

Abstract:

In order to improve the particle size of KCl products，the effects of factors such as the concentration of MgCl₂ in the decomposition solution，the crystallization residence time，the stirring rate，the feed size，and the fine crystal treatment method on the particle size，grade，and recovery of KCl products prepared by cold decomposition crystallization of underground primary high-sodium carnallite ore were studied，and the optimized process conditions were obtained.The results showed that the concentration of decomposition medium MgCl₂，crystallization residence time and stirring rate were the most sensitive to the influence of KCl crystal size.The effect of feed size on KCl crystal size was not significant.After the fine crystals were dissolved，they could return to the crystallizer and participate in crystallization again to obtain larger KCl products.The optimized process conditions were as follows：decomposition medium MgCl₂concentration of 17%，residence time of 2 h，stirring rate of 800 r/min，feed size of raw ore of 1~<4 mm，fine crystal precipitation mixed with decomposition solution and returned to crystallizer.Under the optimized process conditions，good test indexes such as decomposition crystallization KCl recovery rate of 84.70%，flotation concentrate KCl grade of 90.50%，and KCl product average particle size of 0.264 mm were obtained.

Key words: KCl, carnallite, cold decomposition crystallization, feed size, crystallization time

CLC Number:

TQ124.42

GAN Shunpeng, DING Ding, SUN Chenggao, JIANG Shipeng, GUAN Junfang. Study on cold decomposition crystallization process of underground primary high-sodium carnallite ore[J]. Inorganic Chemicals Industry, 2024, 56(1): 67-72.

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实验矿样	离子质量分数					矿物质量分数
实验矿样	K⁺	Mg²⁺	Na⁺	Cl^-		光卤石	钾石盐	MgCl₂	NaCl	水不溶物
高钠光卤石矿	9.85	4.94	15.50	47.06		56.46	3.32	19.35	39.40	0.82

样品	w（K⁺）	w（Na⁺）	w（Mg²⁺）	w（Cl^-）	w（其他）
原矿	9.85	15.50	4.94	47.06	22.65
分解后固相	15.66	27.56	0.00	56.78	0.00
分解后液相	1.76	0.65	6.64	21.97	68.98

原矿给矿粒度/mm	底流粗钾夹带的光卤石质量分数/%	浮选精矿 KCl品位/%	KCl产品粒度/mm
原矿给矿粒度/mm	底流粗钾夹带的光卤石质量分数/%	浮选精矿 KCl品位/%	平均粒径	中值粒径
4~<8	10.50	91.50	0.194	0.167
1~<4	6.97	95.77	0.212	0.187
<1	5.80	88.58	0.192	0.169

细晶处理方式	底流粗钾MgCl₂质量分数/%	浮选精矿KCl品位/%	KCl产品粒度/mm
细晶处理方式	底流粗钾MgCl₂质量分数/%	浮选精矿KCl品位/%	平均粒径	中值粒径
细晶随溢流直接排出系统	1.92	93.50	0.195	0.162
细晶经沉淀后直接返回结晶器	2.06	88.58	0.178	0.157
细晶沉淀后与分解液混合溶解再返回结晶器	1.48	94.34	0.216	0.194

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Study on cold decomposition crystallization process of underground primary high-sodium carnallite ore

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