CN110589844A - 一种高白度硅灰石粉体及其制备方法 - Google Patents
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- 238000002360 preparation method Methods 0.000 title claims abstract description 16
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- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 claims description 3
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Abstract
本发明属于非金属矿矿物加工技术领域,具体涉及一种高白度硅灰石粉体及其制备方法。本发明通过选取大理岩型硅灰石破碎、拣选获得粗精矿,再与辅助矿物原料混合成为混合料,研磨成砂,经除铁后再研磨成粉料。本发明通过增加辅料以控制粉体成分,从而制定高白度的硅灰石粉体,制备过程中深度除铁及避免加工二次污染,确保粉体白度的稳定性,合理阶段研磨利于节能降耗。
Description
技术领域
本发明属于非金属矿矿物加工技术领域,具体涉及一种高白度硅灰石粉体及其制备方法。
背景技术
硅灰石是一种单链硅酸盐矿物,通常呈针状、片状、放射状或纤维状集合体,具有良好的介电性能、很高的白度、较高的耐热及耐候性能,广泛地应用于陶瓷、冶金、造纸、塑料、涂料等领域。特别是在陶瓷工业,硅灰石是一种理想的原料,可以大幅度降低其烧成温度,缩短烧成时间,实现低温快速一次烧成。不仅能够大量节约燃料以降低产品成本,还能提高产品的机械性能、减少产品的裂缝和翘曲、增加釉面光泽、提高胚体强度,进而提高产品的合格率。
高端陶瓷、日用陶瓷、陶瓷釉面等对原料的白度提出了更高的要求,由于天然的硅灰石常伴生有石榴石、符山石等含色杂质及自身多种晶型,严重影响了硅灰石的烧成白度,使得硅灰石在高白度要求的陶瓷产品应用受限。尽管硅灰石制品领域的研究人员采取了多种措施以提高硅灰石的烧成白度,但高白度的硅灰石粉体依然少见,现有产品对原料的要求极高,市场供不应求,开发高白度的硅灰石粉体及其制备方法具有重要的意义。
发明内容
致色元素是影响天然原料烧成白度的原因,如铁、钛、锰等。硅灰石伴生的铁铝石榴石、符山石等是含铁矿物;除此之外,天然硅灰石在形成过程中,因离子替换也会引入铁元素;再一方面,在硅灰石加工过程中,表面粘附粉尘及设备磨损也会引入含铁杂质。
在发明人的前期探索中还发现,天然硅灰石的化学组分和晶相组成也是影响其烧成白度的重要原因,选取合适的硅灰石原矿,通过合适的方法控制其化学组分和晶相组成能够获得高白度的硅灰石粉体。
本发明的技术方案为:
一种高白度硅灰石粉体的制备方法,其工艺流程图如附图1所示,包括以下步骤:
(1)选取大理岩型硅灰石矿经破碎、筛分,水洗干燥,拣选剔除脉石矿物及杂物,获得表面洁净的硅灰石粗精矿;
(2)选取表面洁净的石英、长石、白云石中的至少一种辅助矿物原料碎块与步骤(1)中的硅灰石粗精矿混合混匀,形成混合料;
(3)将步骤(2)中的混合料研磨成60~100目的砂料;
(4)将步骤(3)中砂料过筛后投入磁选机除铁,得到磁性物和非磁性物,所述非磁性物即精砂;
(5)将步骤(4)中的精砂研磨至所需细度,得到高白度硅灰石粉体。
进一步地,步骤(1)中所述大理岩型硅灰石矿为硅灰石-方解石-石英体系矿石;所述拣选为人工拣选或光电选。
进一步地,步骤(1)中表面洁净的硅灰石粗精矿的粒径为5~30mm;步骤(2)中所述辅助矿物原料碎块粒径为5~30mm。
进一步地,步骤(3)中所述研磨为湿法研磨或干法研磨,所述湿法研磨时的矿浆质量浓度为65%~75%。
进一步地,步骤(4)中磁选选用湿法磁选或干法磁选,所述湿法磁选时的矿浆质量浓度为35%~40%;所述除铁包括一次弱磁除铁和至少一次强磁除铁。
进一步地,步骤(5)中所述研磨为干法研磨,研磨至所需细度为200~400目。
上述方法制备得到的高白度硅灰石粉体,所述粉体的组成成分为:52~60wt%SiO2、36~42%wt CaO、0.3~0.8%wt Al2O3、0~0.35wt%Fe2O3、0.3~0.8wt%MgO、0~0.05wt%TiO2、1.5~3.5wt%灼烧减量和0~1wt%R2O,其中R2O为Na2O和K2O之和。
进一步地,所述粉体的晶相包含硅灰石相、石英相、方解石或石灰石相、白云石相、钾长石相或钠长石相,其中硅灰石相的占比大于或等于70%。
进一步地,所述粉体的晶相组成包括:硅灰石相占75%~85%、石英相占3%~17%、方解石或石灰石相+白云石相占4%~8%,钾长石相或钠长石相占3%~8%。
进一步地,所述粉体的灼烧减量检测的煅烧温度为1000±10℃。
本发明的有益效果如下:
1、加入辅助矿物原料从化学组成和晶相组成上控制粉体成分,烧成白度的稳定性好;
2、在拣选的基础上,研磨成砂再进行除铁,能够将微细粒嵌布的石榴石、符山石等杂质有效脱除,尤其是选用湿法除铁的情况下,同时砂料相比粉料易烘干且不结团,有利于降低成本;
3、弱强磁选组合强化除铁,含铁杂质脱除更彻底,后续加工采用陶瓷介质磨机精细研磨,杜绝了常规粉体加工工艺引入的二次铁污染;
4、合理地搭配研磨工段及设备匹配,符合研磨耗能规律,节能效果更佳。
附图说明
图1-本发明高白度硅灰石粉体的制备方法的工艺流程图。
具体实施方式
下面结合具体实施方式,对本发明的技术方案作进一步的详细说明,但不构成对本发明的任何限制。
实施例1
一种高白度硅灰石粉体的制备方法,包括以下步骤:
(1)选取大理岩型硅灰石矿破碎成30mm的碎块,经过筛分获得5~30mm的筛上物,筛上物经过水洗后晾干,人工剔除方解石、黑色脉石及木屑杂物得到硅灰石粗精矿;
(2)选取粒径为5~30mm的表面洁净的9重量份石英、1重量份白云石与步骤(1)中的90重量份硅灰石粗精矿混合混匀,形成混合料;
(3)将步骤(2)中的混合料投入雷蒙磨机干法研磨至100目得到砂料;
(4)将步骤(3)中砂料过40目振动筛筛分后的筛下物先投入1台干式弱磁选机,所得的非磁性物再投入1台干式强磁选机,获得到精砂;
(5)将步骤(4)中的精砂投入陶瓷球介质、橡胶内衬的球磨机研磨,最终得到325目的高白度硅灰石粉体。
实施例2
一种高白度硅灰石粉体的制备方法,包括以下步骤:
(1)选取大理岩型硅灰石矿破碎成20mm的碎块,经过筛分获得5~20mm的筛上物,筛上物经过水洗后晾干,人工剔除方解石及木屑杂物后投入色选机,色选剔除蓝色方解石和其他深色脉石得到硅灰石粗精矿;
(2)选取粒径为5~20mm的表面洁净的7重量份石英、5重量份长石、1重量份白云石与步骤(1)中的88重量份硅灰石粗精矿混合混匀,形成混合料;
(3)将步骤(2)中的混合料配水至浓度为70%投入球磨机湿法研磨至60目得到砂料;
(4)将步骤(3)中砂料过40目振动筛筛分后的筛下物先投入1台湿式弱磁选机,所得的非磁性物再投入2台湿式强磁选机,获得到精砂浆;
(5)将步骤(4)中的精砂矿浆经滤水烘干后投入陶瓷球介质、橡胶内衬的球磨机研磨,最终得到400目的高白度硅灰石粉体。
实施例3
一种高白度硅灰石粉体的制备方法,包括以下步骤:
(1)选取大理岩型硅灰石矿破碎成25mm的碎块,经过筛分获得10~25mm的筛上物,筛上物经过水洗后烘干,人工剔除方解石、黑色板岩及木屑杂物得到硅灰石粗精矿;
(2)选取粒径为10~20mm的表面洁净的1重量份白云石与步骤(1)中的99重量份硅灰石粗精矿混合混匀,形成混合料;
(3)将步骤(2)中的混合料投入球磨机干法研磨至80目得到砂料;
(4)将步骤(3)中砂料配水至浓度为40%后,投入40目振动筛筛分后的筛下物先投入1台湿式弱磁选机,所得的非磁性物再投入1台湿式强磁选机,获得到精砂矿浆;
(5)将步骤(4)中的精砂矿浆经滤水烘干后投入陶瓷球介质、橡胶内衬的球磨机研磨,最终得到250目的高白度硅灰石粉体。
实施例4
一种高白度硅灰石粉体的制备方法,包括以下步骤:
(1)选取大理岩型硅灰石矿破碎成10mm的碎块,经过筛分获得5~10mm的筛上物,筛上物经过水洗后烘干,人工剔除木屑杂物后投入色选机得到了硅灰石粗精矿;
(2)选取粒径为5~10mm的表面洁净的1重量份白云石、7重量份长石与步骤(1)中的92重量份硅灰石粗精矿混合混匀,形成混合料;
(3)将步骤(2)中的混合料配水至浓度65%后投入雷蒙磨机湿法研磨至100目得到砂料矿浆;
(4)将步骤(3)中砂料矿浆经过40目振动筛筛分后的筛下物先投入1台湿式弱磁选机,所得的非磁性物再投入1台湿式强磁选机,获得到精砂矿浆;
(5)将步骤(4)中的精砂矿浆滤水烘干后投入陶瓷段介质、橡胶内衬的球磨机研磨,最终得到300目的高白度硅灰石粉体。
实施例5
一种高白度硅灰石粉体的制备方法,包括以下步骤:
(1)选取大理岩型硅灰石矿破碎成30mm的碎块,经过筛分获得10~30mm的筛上物,筛上物经过水洗后烘干,人工剔除方解石、部分石英及木屑杂物得到硅灰石粗精矿;
(2)选取粒径为10~30mm的表面洁净的1重量份长石与步骤(1)中的98重量份硅灰石粗精矿混合混匀,形成混合料;
(3)将步骤(2)中的混合料配水至浓度75%后投入球磨机湿法研磨至60目得到砂料矿浆;
(4)将步骤(3)中砂料矿浆经过滤水烘干后,投入40目振动筛筛分后的筛下物先投入1台干式弱磁选机,所得的非磁性物再投入1台干式强磁选机,获得到精砂;
(5)将步骤(4)中的精砂投入陶瓷球介质、橡胶内衬的球磨机研磨,最终得到200目的高白度硅灰石粉体。
高白度硅灰石粉体检测指标
实施例1至5中的高白度硅灰石粉体的化学成分、白度和晶相组成如下表1和表2所示。
表1高白度硅灰石粉体的化学成分
注:R2O指Na2O与K2O之和。
表2高白度硅灰石粉体的白度和晶相组成
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其它的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (10)
1.一种高白度硅灰石粉体的制备方法,其特征在于,包括以下步骤:
(1)选取大理岩型硅灰石矿经破碎、筛分,水洗干燥,拣选剔除脉石矿物及杂物,获得表面洁净的硅灰石粗精矿;
(2)选取表面洁净的石英、长石、白云石中的至少一种辅助矿物原料碎块与步骤(1)中的硅灰石粗精矿混合混匀,形成混合料;
(3)将步骤(2)中的混合料研磨成60~100目的砂料;
(4)将步骤(3)中砂料过筛后投入磁选机除铁,得到磁性物和非磁性物,所述非磁性物即精砂;
(5)将步骤(4)中的精砂研磨至所需细度,得到高白度硅灰石粉体。
2.根据权利要求1所述的一种高白度硅灰石粉体制备方法,其特征在于,步骤(1)中所述大理岩型硅灰石矿为硅灰石-方解石-石英体系矿石;所述拣选为人工拣选或光电选。
3.根据权利要求1所述的一种高白度硅灰石粉体制备方法,其特征在于,步骤(1)中表面洁净的硅灰石粗精矿的粒径为5~30mm;步骤(2)中所述辅助矿物原料碎块粒径为5~30mm。
4.根据权利要求1所述的一种高白度硅灰石粉体制备方法,其特征在于,步骤(3)中所述研磨为湿法研磨或干法研磨,所述湿法研磨时的矿浆质量浓度为65%~75%。
5.根据权利要求1所述的一种高白度硅灰石粉体制备方法,其特征在于,步骤(4)中磁选选用湿法磁选或干法磁选,所述湿法磁选时的矿浆质量浓度为35%~40%;所述除铁包括一次弱磁除铁和至少一次强磁除铁。
6.根据权利要求1所述的一种高白度硅灰石粉体制备方法,其特征在于,步骤(5)中所述研磨为干法研磨,研磨至所需细度为200~400目。
7.权利要求1至6所述的任一种方法制备得到的高白度硅灰石粉体,其特征在于,所述粉体的组成成分为:52~60wt%SiO2、36~42%wt CaO、0.3~0.8%wt Al2O3、0~0.35wt%Fe2O3、0.3~0.8wt%MgO、0~0.05wt%TiO2、1.5~3.5wt%灼烧减量和0~1wt%R2O,其中R2O为Na2O和K2O之和。
8.根据权利要求7所述一种高白度硅灰石粉体,其特征在于,所述粉体的晶相包含硅灰石相、石英相、方解石或石灰石相、白云石相、钾长石相或钠长石相,其中硅灰石相的占比大于或等于70%。
9.根据权利要求7所述一种高白度硅灰石粉体,其特征在于,所述粉体的晶相组成包括:硅灰石相占75%~85%、石英相占3%~17%、方解石或石灰石相+白云石相占4%~8%,钾长石相或钠长石相占3%~8%。
10.根据权利要求7所述一种高白度硅灰石粉体,其特征在于,所述粉体的灼烧减量检测的煅烧温度为1000±10℃。
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