CN111232996A - Low-temperature calcination whitening process for talc ore, product and application thereof - Google Patents
Low-temperature calcination whitening process for talc ore, product and application thereof Download PDFInfo
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/22—Magnesium silicates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
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Abstract
本发明涉及滑石增白工艺的技术领域，具体涉及一种滑石矿的低温煅烧增白工艺及其产品和应用，增白工艺包括以下步骤：将滑石原矿粉碎，然后与水混合制得矿浆I；在矿浆I中加入有机酸，加热搅拌制得矿浆II；矿浆II中加入氯化钠，搅拌均匀，然后过滤，得到滤料；将滤料煅烧，然后自然冷却至常温取出，得到滑石粉；本发明的低温煅烧增白工艺，具有工艺高效、环境友好、操作简单、产品无残留离子等优点，可以制备运用于塑料、医药、食品、化妆品或涂料上的滑石粉。
The present invention relates to the technical field of talc whitening process, in particular to a low-temperature calcination whitening process of talc ore and its product and application. The whitening process comprises the following steps: pulverizing talc raw ore, and then mixing with water to obtain pulp I; Add organic acid to ore pulp I, heat and stir to prepare ore pulp II; add sodium chloride to ore pulp II, stir evenly, then filter to obtain filter material; calcine the filter material, then naturally cool to room temperature and take out to obtain talcum powder; The invented low-temperature calcination and whitening process has the advantages of high efficiency, environmental friendliness, simple operation, and no residual ions in the product, and can prepare talc powder used in plastics, medicine, food, cosmetics or coatings.
Description
技术领域technical field
本发明涉及滑石增白工艺的技术领域，具体涉及一种滑石矿的低温煅烧增白工艺及其产品和应用。The invention relates to the technical field of talc whitening process, in particular to a low-temperature calcining whitening process of talc ore and its product and application.
背景技术Background technique
非金属矿物材料在现代工业和国民经济中具有广泛的用途。我国的石灰石、高岭土、石墨、滑石等矿种储量居世界前列，而滑石是一种重要的非金属矿物原料。滑石是含水的层状硅酸盐矿物，因具有良好的电绝缘性、耐热性、化学稳定性、润滑性、吸油性、遮盖力及机械加工性能等，被广泛用于造纸、化妆品、日用化工、陶瓷、塑料、建筑材料、橡胶及医药等行业。其中的绝大部分行业把滑石的白度作为一项重要的指标，要求高白度、高纯度。然而，我国高白度和纯度的优质滑石资源少，当前滑石资源70％为中低品位滑石，其白度无法满足使用要求而不能被有效利用，造成大量资源的浪费。所以如何以中低品级滑石矿为原料，获得高白度的优质滑石对缓解当前高档滑石资源市场供不应求的局面，促进我国滑石工业的技术进步具有重要的意义。Non-metallic mineral materials have a wide range of uses in modern industry and national economy. my country's reserves of minerals such as limestone, kaolin, graphite, and talc rank among the top in the world, and talc is an important non-metallic mineral raw material. Talc is a water-containing layered silicate mineral. It has good electrical insulation, heat resistance, chemical stability, lubricity, oil absorption, covering power and mechanical processing properties. Used in chemical, ceramics, plastics, building materials, rubber and pharmaceutical industries. Most of the industries regard the whiteness of talc as an important indicator, requiring high whiteness and high purity. However, there are few high-quality talc resources with high whiteness and purity in my country. 70% of the current talc resources are medium and low-grade talc. Therefore, how to obtain high-quality talc with high whiteness using medium and low-grade talc ore as raw materials is of great significance to alleviate the current shortage of high-grade talc resources in the market and promote the technological progress of my country's talc industry.
目前，滑石增白方法有煅烧、漂白剂、混矿、酸浸、除铁、除氧化钙等，当前主要以煅烧工艺为主来获得高白度的滑石。如专利“黑滑石制作高白超细滑石粉的工艺”(申请号200610101218.1)，“一种黑滑石的增白方法”(申请号200910061358.4)，“一种将黑滑石制备成高白度超细滑石粉的方法”(申请号201410504296.0)均是采用煅烧工艺提升滑石白度。然而，上述工艺中的煅烧温度均大于滑石的相变温度(850℃)，煅烧过程中滑石相转变为硬度较高的顽火辉石(莫式硬度5.5)，致使滑石失去低硬度、润滑性、油腻感好等特点，无法应用于要求使用滑石特性的领域，如塑料、医药、食品、化妆品、涂料等领域，失去了滑石应有的价值。对此，专利“一种低白度滑石粉除氧化钙增白的方法”(申请号201310476498.4)在获得具有滑石特性的高白度滑石粉方面进行了探索。但该工艺不环保，且存在健康风险，如盐酸易挥发，对设备和作业人员不友好；保险粉为强氧化剂、易燃，对眼、呼吸道和皮肤有刺激性，会引起头痛、恶心和呕吐等危害。近来，专利“一种利用黑滑石生产高白度低硬度滑石的煅烧及装置”(授权号CN 206940443 U)对煅烧工艺进行改进，利用给氧装置建立氧化气氛条件，实现黑滑石的低温煅烧。然而，该工艺仅适用于只含有机碳质的黑滑石矿。当滑石矿中含Fe等元素时，氧化气氛会致使滑石粉发红，影响其白度。因此，目前仍有待探索出工艺高效、环境友好、普适的低温增白技术。At present, talc whitening methods include calcination, bleaching agent, ore mixing, acid leaching, iron removal, calcium oxide removal, etc. At present, calcination process is mainly used to obtain high whiteness talc. For example, the patent "the process of making high-white superfine talc powder from black talc" (application number 200610101218.1), "a method for whitening black talc" (application number 200910061358.4), "a method for preparing black talc into high-whiteness superfine talc powder" The method" (application number 201410504296.0) is to use a calcination process to improve the whiteness of talc. However, the calcination temperature in the above process is all higher than the phase transition temperature of talc (850°C), and the talc phase transforms into enstatite with higher hardness (Mohs hardness 5.5) during the calcination process, resulting in the loss of low hardness and lubricity of talc. It cannot be used in fields that require the use of talc, such as plastics, medicine, food, cosmetics, coatings and other fields, and loses its due value. In this regard, the patent "A Method for Removing Calcium Oxide and Whitening with Low Whiteness Talc Powder" (Application No. 201310476498.4) has explored the aspect of obtaining high whiteness talc powder with talc characteristics. However, this process is not environmentally friendly and has health risks, such as volatile hydrochloric acid, which is not friendly to equipment and operators; hydrosulfite is a strong oxidant, flammable, irritating to eyes, respiratory tract and skin, causing headache, nausea and vomiting and other hazards. Recently, the patent "A calcination and device for producing talc with high whiteness and low hardness using black talc" (authorized number CN 206940443 U) improves the calcination process, and uses an oxygen supply device to establish an oxidizing atmosphere condition to achieve low-temperature calcination of black talc. However, this process is only applicable to black talc ore containing only organic carbon. When the talc ore contains elements such as Fe, the oxidizing atmosphere will cause the talc powder to turn red and affect its whiteness. Therefore, there is still a need to explore a low-temperature whitening technology that is efficient, environmentally friendly, and universal.
发明内容SUMMARY OF THE INVENTION
本发明的目的是提出一种滑石矿的低温煅烧增白工艺及其产品和应用，具有工艺高效、环境友好、操作简单等优点。The purpose of the present invention is to propose a low-temperature calcination and whitening process of talc ore and its product and application, which have the advantages of high efficiency, environmental friendliness, simple operation and the like.
本发明的技术目的是通过以下技术方案实现的：The technical purpose of the present invention is achieved through the following technical solutions:
一种滑石矿的低温煅烧增白工艺；包括以下步骤：A low-temperature calcination and whitening process of talc ore; comprising the following steps:
(1)将滑石原矿粉碎，然后与水混合制得矿浆I；(1) talc crude ore is pulverized, then mixed with water to obtain pulp I;
(2)在矿浆I中加入有机酸，加热搅拌制得矿浆II；(2) adding organic acid in ore pulp I, heating and stirring to obtain ore pulp II;
(3)在矿浆II中加入氯化钠，搅拌均匀，然后过滤，得到滤料；(3) in ore pulp II, add sodium chloride, stir, then filter to obtain filter material;
(4)将滤料煅烧，然后自然冷却至常温取出，得到滑石粉。(4) calcining the filter material, then naturally cooling to normal temperature and taking out to obtain talc powder.
进一步的，步骤(1)中所述滑石原矿的白度为25-60，粉碎后滑石原矿的粒度为80-5000目。粒度越小，煅烧后的白度越高，本发明制得的滑石粉应用领域较为广泛，可以依据具体适用领域的需要，对滑石原矿的粒度做进一步的限定，当用于化妆品和医药领域时，滑石原矿的粒度为范围值中的较小值，当用于塑料和涂料等领域时，滑石原矿的粒度为范围值中的较大值。Further, the whiteness of the talc ore described in step (1) is 25-60, and the particle size of the talc ore after pulverization is 80-5000 mesh. The smaller the particle size, the higher the whiteness after calcination. The talc powder prepared by the present invention has a wide range of application fields, and the particle size of the talc ore can be further limited according to the needs of the specific application field. When used in the field of cosmetics and medicine , the particle size of talc raw ore is the smaller value in the range value, when used in plastics and coatings and other fields, the particle size of talc raw ore is the larger value in the range value.
进一步的，步骤(1)中，滑石原矿与水的质量比为1:4-8。水的添加量以使滑石原矿混合均匀，便于后续的酸化和除铁等步骤的顺利进行。Further, in step (1), the mass ratio of talc ore to water is 1:4-8. The amount of water added is so that the talc ore is mixed evenly, which facilitates the smooth progress of subsequent acidification and iron removal.
进一步的，步骤(2)中，有机酸与滑石原矿的质量比为1-4:100，所述有机酸包括甲酸、乙酸和酒石酸中的至少一种。本发明有机酸的添加以除去滑石原矿中的铁，同时有机酸具有漂白的作用，同时有机酸相较于现有技术的盐酸，不易挥发，环境友好，同时剩余有机酸在后续煅烧过程中燃烧，不会残留于滑石粉中，相较于盐酸处理的方式，除了盐酸易挥发，会污染环境，同时多余的盐酸会残留于滑石粉中，导致滑石粉中的氯含量增高，同时遗留的盐酸对后续应用在化妆品、食品或医药等领域，对皮肤或身体健康均有刺激性作用，导致其适用领域较窄。Further, in step (2), the mass ratio of organic acid to talc ore is 1-4:100, and the organic acid includes at least one of formic acid, acetic acid and tartaric acid. The organic acid of the present invention is added to remove iron in the talc ore, and at the same time, the organic acid has a bleaching effect, and at the same time, compared with the hydrochloric acid in the prior art, the organic acid is less volatile and environmentally friendly, and the remaining organic acid is burned in the subsequent calcination process. , will not remain in the talc powder. Compared with the hydrochloric acid treatment method, in addition to the volatile hydrochloric acid, it will pollute the environment. At the same time, the excess hydrochloric acid will remain in the talc powder, resulting in an increase in the chlorine content in the talc powder. For subsequent applications in the fields of cosmetics, food or medicine, it has irritating effects on skin or physical health, resulting in a narrow application field.
进一步的，步骤(2)中，加热搅拌的温度为40-100℃，加热搅拌的时间为1-5小时。加热条件下，保证有机酸不挥发，同时促进有机酸与滑石原矿中的铁的反应速度，快速和高效的除去滑石原矿中的铁。Further, in step (2), the temperature of heating and stirring is 40-100° C., and the time of heating and stirring is 1-5 hours. Under the heating condition, the organic acid is not volatilized, and the reaction speed between the organic acid and the iron in the talc ore is accelerated, and the iron in the talc ore is quickly and efficiently removed.
进一步的，步骤(3)中，氯化钠与滑石原矿的质量比为1-4:100，搅拌时间为2-15分钟。氯化钠用于除去滑石原矿中的铁，氯化钠的添加量可以依据滑石原矿的白度等做适应性调整。Further, in step (3), the mass ratio of sodium chloride to talc ore is 1-4:100, and the stirring time is 2-15 minutes. Sodium chloride is used to remove iron from talc ore, and the amount of sodium chloride added can be adjusted adaptively according to the whiteness of talc ore.
进一步的，步骤(4)中，煅烧温度为500℃-800℃，煅烧时间为1-8小时。煅烧温度的限定，保持滑石矿物相不变的情况下提升滑石粉的白度，而现有技术中的煅烧过程中，温度为850℃时，白云石完全分解，滑石开始发生相变。随着温度的升高，滑石相变完全，生成顽火辉石；白云石分解后的产物，分别与SiO2，反应生成顽火辉石和硅酸钙。1150℃烧后，样品中的主要物相是：顽火辉石、硅酸钙和二氧化硅。进而，现有技术中提高煅烧温度，虽然会进一步的提升滑石粉的白度，但是其物相改变，制得的并不是滑石，失去了滑石本身低硬度、润滑性、油腻感好等特点。Further, in step (4), the calcination temperature is 500°C-800°C, and the calcination time is 1-8 hours. The calcination temperature is limited to improve the whiteness of the talc powder while keeping the talc mineral phase unchanged. However, in the calcination process in the prior art, when the temperature is 850°C, the dolomite is completely decomposed, and the talc begins to undergo phase transformation. With the increase of temperature, the phase transition of talc is complete and enstatite is formed; the decomposed products of dolomite react with SiO 2 to form enstatite and calcium silicate respectively. After burning at 1150℃, the main phases in the sample are: enstatite, calcium silicate and silicon dioxide. Furthermore, increasing the calcination temperature in the prior art will further improve the whiteness of the talc powder, but its phase changes, and the obtained talc is not talc, and loses the characteristics of talc itself such as low hardness, lubricity, and good greasy feeling.
进一步的，所述滑石矿的低温煅烧增白工艺制备得到滑石粉，所述滑石粉的白度为85-95。Further, talc powder is prepared by the low-temperature calcination and whitening process of the talc ore, and the whiteness of the talc powder is 85-95.
进一步的，本发明低温煅烧增白工艺制备的滑石粉在塑料、医药、食品、化妆品或涂料领域上的应用。Further, the application of the talc powder prepared by the low-temperature calcination and whitening process of the present invention in the fields of plastics, medicine, food, cosmetics or coatings.
进一步的，步骤(4)中煅烧后的滤料冷却至常温，其中常温也叫一般温度或者室温，一般定义为25℃，本方案中仅需将煅烧后高温的滤料降温至相对较低温度即可，对常温具体指代的温度范围不做限定。Further, the filter material after calcination in step (4) is cooled to normal temperature, wherein the normal temperature is also called general temperature or room temperature, generally defined as 25 ° C, in this scheme, only the high temperature filter material after calcination is cooled to a relatively low temperature. That is, the temperature range specifically referred to by normal temperature is not limited.
酸可与致色的Fe等金属或致色的金属氧化物发生反应，提高滑石白度；采用有机酸替代无机酸时，有机酸与致黑的有机质碳相互作用，起到活化作用，进一步促进有机碳在低温下分解，进而达到在较低煅烧温度下提升滑石白度的目的。Acids can react with metals such as color-causing Fe or color-causing metal oxides to improve the whiteness of talc; when an organic acid is used to replace an inorganic acid, the organic acid interacts with the black-causing organic carbon to activate and further promote the The organic carbon is decomposed at low temperature, thereby achieving the purpose of improving the whiteness of talc at a lower calcination temperature.
本发明的有益效果：Beneficial effects of the present invention:
1、本发明有机酸的使用，对环境友好，对设备机器破坏程度(腐蚀)较小，且废液好处理；1. The use of the organic acid of the present invention is environmentally friendly, with less damage (corrosion) to equipment and machinery, and the waste liquid is easy to handle;
2、本发明的工艺能保持滑石物相不变，保有滑石原有特性；2. The process of the present invention can keep the phase of talc unchanged, and keep the original characteristics of talc;
3、本发明具有工艺流程简单、生产成本低、产品中杂质残留少等优点；3. The present invention has the advantages of simple technological process, low production cost, and less residue of impurities in the product;
4、本发明制得的滑石矿白度满足大多数领域的应用要求有利于拓展我国中低品位滑石资源在化妆，塑料，医药等行业中的应用。4. The whiteness of the talc ore prepared by the invention meets the application requirements in most fields, which is beneficial to expand the application of medium and low-grade talc resources in my country in industries such as cosmetics, plastics, and medicine.
附图说明Description of drawings
图1为滑石矿在750℃条件下煅烧的XRD图；Fig. 1 is the XRD pattern of talc calcined at 750°C;
图2为滑石矿在850℃条件下煅烧的XRD图。Figure 2 is the XRD pattern of talc calcined at 850°C.
具体实施方式Detailed ways
下面通过实施例对本发明的技术效果进行具体描述。有必要在此指出的是以下实施例只是用于对本发明进行进一步的说明，不能理解为对本发明保护范围的限制，该领域的技术熟练人员根据上述发明内容所做出的一些非本质的改进和调整，仍属于本发明的保护范围。The technical effects of the present invention will be described in detail below by way of examples. It is necessary to point out that the following examples are only used to further illustrate the present invention, and should not be construed as limiting the scope of protection of the present invention. The adjustment still belongs to the protection scope of the present invention.
实施例1Example 1
一种滑石矿的低温煅烧增白工艺；包括以下步骤：A low-temperature calcination and whitening process of talc ore; comprising the following steps:
(1)将白度为34的滑石原矿粉碎至80目，称取100克原矿，加入400克水，搅拌10分钟，制得矿浆I；(1) be that the talc crude ore of 34 with whiteness is pulverized to 80 orders, take by weighing 100 grams of crude ore, add 400 grams of water, stir 10 minutes, make ore pulp I;
(2)在矿浆I中加入4克乙酸，升温至40℃，搅拌1小时，制得矿浆II；(2) 4 grams of acetic acid was added to the pulp I, the temperature was raised to 40° C., and stirred for 1 hour to obtain the pulp II;
(3)在矿浆II中加入4克氯化钠，搅拌15分钟，然后过滤，得到滤料；(3) in ore pulp II, add 4 grams of sodium chloride, stir for 15 minutes, then filter to obtain filter material;
(4)将滤料于800℃煅烧8小时，然后自然冷却至常温取出，得到滑石粉。(4) calcining the filter material at 800° C. for 8 hours, then naturally cooling to room temperature and taking out to obtain talc powder.
测得滑石粉的白度为92度，产率为98％，滑石粉中Fe含量0.011％，氯残留量0.21％。The whiteness of the talc powder was measured to be 92 degrees, the yield was 98%, the Fe content in the talc powder was 0.011%, and the residual chlorine content was 0.21%.
实施例2Example 2
一种滑石矿的低温煅烧增白工艺；包括以下步骤：A low-temperature calcination and whitening process of talc ore; comprising the following steps:
(1)将白度为47的滑石原矿粉碎至100目，称取100克原矿，加入400克水，搅拌10分钟，制得矿浆I；(1) the talc crude ore with whiteness of 47 is pulverized to 100 orders, and 100 grams of crude ore are weighed, and 400 grams of water are added, and stirred for 10 minutes to obtain pulp I;
(2)在矿浆I中加入3.5克乙酸，升温至60℃，搅拌2小时，制得矿浆II；(2) 3.5 grams of acetic acid was added to the pulp I, the temperature was raised to 60 ° C, and stirred for 2 hours to obtain the pulp II;
(3)在矿浆II中加入3克氯化钠，搅拌4分钟，然后过滤，得到滤料；(3) in ore pulp II, add 3 grams of sodium chloride, stir for 4 minutes, then filter to obtain filter material;
(4)将滤料于750℃煅烧6小时，然后自然冷却至常温取出，得到滑石粉。(4) calcining the filter material at 750° C. for 6 hours, then naturally cooling to room temperature and taking out to obtain talc powder.
测得滑石粉的白度为91度，产率为97％，滑石粉中Fe含量0.010％，氯残留量0.09％。The whiteness of the talc powder was measured to be 91 degrees, the yield was 97%, the Fe content in the talc powder was 0.010%, and the residual chlorine content was 0.09%.
实施例3Example 3
一种滑石矿的低温煅烧增白工艺；包括以下步骤：A low-temperature calcination and whitening process of talc ore; comprising the following steps:
(1)将白度为25的滑石原矿粉碎至120目，称取100克原矿，加入400克水，搅拌10分钟，制得矿浆I；(1) the talc crude ore with a whiteness of 25 is pulverized to 120 meshes, and 100 grams of crude ore are weighed, and 400 grams of water are added, and stirred for 10 minutes to obtain ore pulp I;
(2)在矿浆I中加入2.5克甲酸，升温至80℃，搅拌3小时，制得矿浆II；(2) 2.5 grams of formic acid was added to the pulp I, the temperature was raised to 80° C., and stirred for 3 hours to obtain the pulp II;
(3)在矿浆II中加入2.5克氯化钠，搅拌8分钟，然后过滤，得到滤料；(3) in ore pulp II, add 2.5 grams of sodium chloride, stir for 8 minutes, then filter to obtain filter material;
(4)将滤料于700℃煅烧4小时，然后自然冷却至常温取出，得到滑石粉。(4) calcining the filter material at 700° C. for 4 hours, then naturally cooling to room temperature and taking out to obtain talc powder.
测得滑石粉的白度为88度，产率为97％，滑石粉中氯残留量0.15％。The whiteness of the talc powder was measured to be 88 degrees, the yield was 97%, and the residual chlorine in the talc powder was 0.15%.
实施例4Example 4
一种滑石矿的低温煅烧增白工艺；包括以下步骤：A low-temperature calcination and whitening process of talc ore; comprising the following steps:
(1)将白度为32的滑石原矿粉碎至150目，称取100克原矿，加入400克水，搅拌10分钟，制得矿浆I；(1) the talc crude ore with whiteness of 32 is pulverized to 150 meshes, and 100 grams of crude ore are weighed, and 400 grams of water are added, and stirred for 10 minutes to obtain ore pulp I;
(2)在矿浆I中加入2克甲酸，升温至100℃，搅拌4小时，制得矿浆II；(2) 2 grams of formic acid was added to the ore pulp I, the temperature was raised to 100° C., and stirred for 4 hours to obtain the ore pulp II;
(3)在矿浆II中加入2克氯化钠，搅拌5分钟，然后过滤，得到滤料；(3) in ore pulp II, add 2 grams of sodium chloride, stir for 5 minutes, then filter to obtain filter material;
(4)将滤料于500℃煅烧3小时，然后自然冷却至常温取出，得到滑石粉。(4) The filter material is calcined at 500° C. for 3 hours, then naturally cooled to room temperature and taken out to obtain talc powder.
测得滑石粉的白度为89度，产率为98％，滑石粉中氯残留量0.16％。The whiteness of the talc was measured to be 89 degrees, the yield was 98%, and the residual chlorine in the talc was 0.16%.
实施例5Example 5
一种滑石矿的低温煅烧增白工艺；包括以下步骤：A low-temperature calcination and whitening process of talc ore; comprising the following steps:
(1)将白度为32的滑石原矿粉碎至180目，称取100克原矿，加入400克水，搅拌10分钟，制得矿浆I；(1) the talc crude ore with a whiteness of 32 is pulverized to 180 meshes, and 100 grams of crude ore are weighed, and 400 grams of water are added, and stirred for 10 minutes to obtain ore pulp I;
(2)在矿浆I中加入1克有机酸，升温至60℃，搅拌5小时，制得矿浆II；(2) 1 gram of organic acid was added to the ore pulp I, the temperature was raised to 60° C., and stirred for 5 hours to obtain the ore pulp II;
(3)在矿浆II中加入1克氯化钠，搅拌10分钟，然后过滤，得到滤料；(3) in ore pulp II, add 1 gram of sodium chloride, stir for 10 minutes, then filter to obtain filter material;
(4)将滤料于800℃煅烧1小时，然后自然冷却至常温取出，得到滑石粉。(4) calcining the filter material at 800° C. for 1 hour, then naturally cooling to room temperature and taking out to obtain talc powder.
测得滑石粉的白度为90度，产率为96％，滑石粉中氯残留量0.08％。The whiteness of the talc powder was measured to be 90 degrees, the yield was 96%, and the residual chlorine in the talc powder was 0.08%.
实施例6Example 6
一种滑石矿的低温煅烧增白工艺；包括以下步骤：A low-temperature calcination and whitening process of talc ore; comprising the following steps:
(1)将白度为43的滑石原矿粉碎至4500目，称取100克原矿，加入400克水，搅拌10分钟，制得矿浆I；(1) the talc crude ore with whiteness of 43 is pulverized to 4500 orders, take by weighing 100 grams of crude ore, add 400 grams of water, stir 10 minutes, and obtain pulp I;
(2)在矿浆I中加入2克有机酸，升温至55℃，搅拌1小时，制得矿浆II；(2) add 2 grams of organic acid in ore pulp I, be warming up to 55 ℃, stir for 1 hour, make ore pulp II;
(3)在矿浆II中加入1克氯化钠，搅拌10分钟，然后过滤，得到滤料；(3) in ore pulp II, add 1 gram of sodium chloride, stir for 10 minutes, then filter to obtain filter material;
(4)将滤料于750℃煅烧3.5小时，然后自然冷却至常温取出，得到滑石粉。(4) calcining the filter material at 750° C. for 3.5 hours, then naturally cooling to room temperature and taking out to obtain talc powder.
测得滑石粉的白度为92度，产率为96％，滑石粉中氯残留量0.06％。The whiteness of the talc powder was measured to be 92 degrees, the yield was 96%, and the residual chlorine in the talc powder was 0.06%.
实施例7Example 7
一种滑石矿的低温煅烧增白工艺；包括以下步骤：A low-temperature calcination and whitening process of talc ore; comprising the following steps:
(1)将白度为58的滑石原矿粉碎至2500目，称取100克原矿，加入400克水，搅拌10分钟，制得矿浆I；(1) the talc crude ore with a whiteness of 58 is pulverized to 2500 orders, take by weighing 100 grams of crude ore, add 400 grams of water, stir 10 minutes, and obtain pulp I;
(2)在矿浆I中加入1.5克有机酸，升温至60℃，搅拌2小时，制得矿浆II；(2) adding 1.5 grams of organic acid to the ore pulp I, warming up to 60° C., stirring for 2 hours, to obtain the ore pulp II;
(3)在矿浆II中加入2克氯化钠，搅拌15分钟，然后过滤，得到滤料；(3) in ore pulp II, add 2 grams of sodium chloride, stir for 15 minutes, then filter to obtain filter material;
(4)将滤料于800℃煅烧3小时，然后自然冷却至常温取出，得到滑石粉。(4) The filter material is calcined at 800° C. for 3 hours, then naturally cooled to room temperature and taken out to obtain talc powder.
测得滑石粉的白度为93度，产率为98％，滑石粉中氯残留量0.17％。The whiteness of the talc powder was measured to be 93 degrees, the yield was 98%, and the residual chlorine in the talc powder was 0.17%.
对比例1Comparative Example 1
将实施例1中的步骤(2)中的乙酸替换为盐酸，其余步骤和实验参数均与实施例1一致；最终制得的滑石粉的白度为91度，产率为97％，滑石粉中氯残留量2.3％。The acetic acid in the step (2) in Example 1 was replaced with hydrochloric acid, and the remaining steps and experimental parameters were all consistent with Example 1; The residual chlorine content is 2.3%.
对比例2Comparative Example 2
将实施例1中的步骤(4)中的煅烧温度替换为850℃，其余步骤和实验参数均与实施例1一致；最终制得的滑石粉的白度为93度，产率为98％，滑石粉中氯残留量0.9％。The calcination temperature in step (4) in Example 1 was replaced with 850 ° C, and the remaining steps and experimental parameters were consistent with Example 1; the final whiteness of the obtained talc was 93 degrees, and the yield was 98%, The residual chlorine in talc is 0.9%.
以上实施例仅为本发明的优选实施例而已，仅用于说明本发明的技术方案而非限制，本领域技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本发明的宗旨和范围，其均应涵盖在本发明的保护范围当中。The above embodiments are only preferred embodiments of the present invention, and are only used to illustrate the technical solutions of the present invention and not to limit them. Those skilled in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the present invention. The purpose and scope of the present invention shall be included in the protection scope of the present invention.
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